US20170138612A1 - Heat and energy recovery and regeneration assembly, system and method - Google Patents
Heat and energy recovery and regeneration assembly, system and method Download PDFInfo
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- US20170138612A1 US20170138612A1 US15/417,509 US201715417509A US2017138612A1 US 20170138612 A1 US20170138612 A1 US 20170138612A1 US 201715417509 A US201715417509 A US 201715417509A US 2017138612 A1 US2017138612 A1 US 2017138612A1
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1084—Arrangement or mounting of control or safety devices for air heating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D12/00—Other central heating systems
- F24D12/02—Other central heating systems having more than one heat source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D5/00—Hot-air central heating systems; Exhaust gas central heating systems
- F24D5/02—Hot-air central heating systems; Exhaust gas central heating systems operating with discharge of hot air into the space or area to be heated
- F24D5/04—Hot-air central heating systems; Exhaust gas central heating systems operating with discharge of hot air into the space or area to be heated with return of the air or the air-heater
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/06—Air heaters with forced circulation the air being kept separate from the heating medium, e.g. using forced circulation of air over radiators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/12—Air heaters with additional heating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
- F24D2200/18—Flue gas recuperation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
- F24D2200/22—Ventilation air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2220/00—Components of central heating installations excluding heat sources
- F24D2220/06—Heat exchangers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
Definitions
- the disclosed embodiment relates generally to the field of air conditioning and heating systems; more particularly, it concerns a system for efficiently combusting fossil fuels for heating a space.
- the conventional methodology used in utilizing fossil fuels for heating habitable spaces in commercial, industrial and residential buildings or structures is firing the fuel in a controlled heating chamber or heat exchanger.
- the heat created by the burning fuel is drawn away by air or water flowing around the outside of the heat exchanger. This can be accomplished by blower fans or pumps.
- the heat is transferred into the surrounding air or water, heating the conditioned space.
- the waste or emissions from the combustion reaction is allowed to flow outdoors usually utilizing flue piping to a chimney or stack.
- the efficiency of the furnace or boiler is calculated by the amount of heat which can be extracted from the heat exchanger and utilized to heat the conditioned space and the percentage of heat and by-products permitted to escape through the flue to be vented outside. This rating or efficiency quantification is placed on the furnace or boiler to depict how efficient it will be.
- FIG. 1 is a schematic illustration of heat recovery assembly in accordance with aspects of the disclosed embodiment.
- FIG. 1A is a schematic illustration of a portion of a heat recovery assembly in accordance with aspects of the disclosed embodiment.
- FIG. 1B is a schematic illustration of a portion of a heat recovery assembly in accordance with aspects of the disclosed embodiment.
- FIG. 1C is a schematic illustration of a portion of a heat recovery assembly in accordance with aspects of the disclosed embodiment.
- FIG. 1D is a schematic illustration of a portion of a heat recovery assembly in accordance with aspects of the disclosed embodiment.
- FIG. 2 is a schematic illustration of heat recover assembly in accordance with aspects of the disclosed embodiment.
- FIG. 3 is a schematic illustration of the functionality of aspects of the heat recovery assembly of FIGS. 1 and 2 .
- FIG. 4 is a schematic illustration of a heat exchange process utilized in aspects of the heat recovery assembly of FIGS. 1 and 2 .
- FIG. 5 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIG. 5A is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIG. 6 is a schematic illustration of a heat recovery system utilizing a heat recovery ventilator assembly in accordance with aspects of the disclosed embodiment.
- FIG. 7 is a schematic illustration of a wiring diagram in accordance with aspects of the heat recovery system illustrated in FIGS. 5 and 5A .
- FIG. 8A is a perspective view of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIG. 8B is a perspective view of a heat recover system in accordance with aspects of the disclosed embodiment.
- FIG. 9 a perspective view of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIG. 10 is a schematic illustration of a cut-away view in accordance aspects of be heat recovery system illustrated in FIG. 9 .
- FIG. 10A is a schematic illustrate on of away view in accordance with aspects of the heat recovery system illustrated in FIG. 9 .
- FIG. 11 is a schematic illustration of a heat recovery system in accordance with aspects the disclosed embodiment.
- FIG. 12 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIG. 13 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIGS. 14A-14F are schematic illustrations of a portion of a heat recovery system in accordance with aspects of the disclosed embodiment
- FIG. 15 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIG. 16 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIG. 17 is a schematic illustration of a portion of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIGS. 18A-18C are a flow diagram for operation of a heat recovery system in accordance with aspects of the disclosed embodiment.
- FIG. 19 is a block diagram of a heat recovery system employing a central thermal recovery unit.
- FIG. 20 is a block diagram illustrating the central thermal recovery unit of FIG. 19 .
- FIG. 21 is system diagram illustrating a heat recovery system employing a central thermal recovery unit.
- FIGS. 22-23 are example user interfaces for receiving system related information.
- FIGS. 24-26 are example system operating reports showing system operation parameter and analysis.
- the aspects of the disclosed embodiment are directed to a heat and energy recovery assembly and system, in addition to methods of using the same.
- the heat and energy recovery assembly and system in accordance with aspects of the disclosed embodiment may be adapted for use with any suitable heating unit such as in a furnace of an HVAC system, boiler system or any other system where heat energy from fuel combustion is utilized for heating air spaces or other fluid medium.
- any suitable heating unit such as in a furnace of an HVAC system, boiler system or any other system where heat energy from fuel combustion is utilized for heating air spaces or other fluid medium.
- a heat recovery assembly/system 100 is provided, as illustrated in FIG. 1 which when combined with a heating furnace 2000 in a heat recovery system 200 (see for exemplary purposes only FIGS. 5 and 5A ) delivers heat to an area or habitat to be heated such that the heat recovery assembly 100 captures and delivers heat from heated air that is circulated in the habitat, exhaust gas from the furnace 2000 and heat stored in the thermal mass that is the furnace assembly.
- the furnace 2000 includes a controller 1311 F that includes any suitable non-transitory program code for effecting a heating cycle of the furnace 2000 . For example, every time a thermostat, such as thermostat TSH, calls for heat, the controller 1311 F of the furnace 2000 detects the call for heat (e.g.
- the furnace exhaust induction fan motor receives a signal from the thermostat TSH) and starts the furnace heating cycle by first activating the furnace exhaust induction fan motor. Once the controller 1311 F confirms proper exhaust pressure is present, the furnace igniter is turned on and verified by the control system. The furnace fuel valve FV opens, the furnace burners FBRN light and heat creation begins. As an example, on a 100,000 btuh furnace, heat is created at a rate about 28 btus per second. The motor of the furnace blower FIB cannot be turned on until the furnace heat exchanger FHX is hot enough to deliver warm air to a habitat to be heated.
- a latent heating period For a period (e.g., a latent heating period) of about 1 to about 2 minutes on most furnaces, while the heat exchanger is warming up, there is no air blowing along the outside of the furnace heat exchanger FXH. If the furnace heat exchanger FHX warm up or latent cycle is about 1 minute long, for exemplary purposes only, approximately 1500 btus of fuel is consumed and that energy is either stored in the thermal mass of the furnace heat exchanger FHX or exhausted out of the furnace exhaust 2100 . When the motor of the furnace blower FIB is finally turned on heat is transferred from the furnace heat exchanger FHX to, for example the air from the return plenum 1300 (e.g. the source heating period).
- the furnace burners FBRN are turned off however, according to the furnace programming the furnace blower continues to run for about 2 to about 4 minutes delivering additional heat to the house (e.g. the residual heating period).
- the about 1 to about 2 minute warm up period and the about 2 minute to about 4 minute cool down period represents about 3 to about 6 minutes (5-10% of an hour) of furnace operation at lower efficiency than the rated steady state efficiency of the furnace 2000 so, for example, is a furnace 2000 is cycled on and off 3 to 5 times an hour (where, e.g., each cycle corresponds to a heat call from the thermostat), then about 15% to about 50% of the time the furnace 2000 is running, the furnace is running below its rated efficiency.
- the heat recovery assembly/system 100 of the aspects of the disclosed embodiment include a multiple stage heat exchange system 120 EX that is configured to recover heat lost during, for example, the warm up and cool down periods of the furnace. Further, in a conventional system the furnace is in an on state (e.g. burners FBRN lit) for 100% of the time during the heat call.
- a multiple stage heat exchange system 120 EX that is configured to recover heat lost during, for example, the warm up and cool down periods of the furnace. Further, in a conventional system the furnace is in an on state (e.g. burners FBRN lit) for 100% of the time during the heat call.
- the aspects of the disclosed embodiment described herein operate to discontinuously run the furnace 2000 in short bursts during a heat call so that the furnace 2000 is cycled on and off to achieve a higher efficiency by creating the start up and cool down furnace cycles/periods as frequently as, for example, 20 times per hour (based on, for example, a 1 hour long heat call) where, for example, during each 180 second cycle the burners FBRN are on for approximately 100 seconds and off for about 80 seconds so that heat is extracted/recovered during the start up and cool down periods, as described herein, to increase furnace efficiency and decrease fuel consumption.
- At least one stage of the multiple stage heat exchange system 120 EX extracts residual heat from the furnace 2000 to balance a heat exchange to the supply air for heating the habitat (e.g. the multiple stage heat exchange system 120 EX operates as a thermal balance to maintain a temperature of the supply air above a predetermined set point for heating the habitat during periods of the heat call where the furnace 2000 is turned off).
- the assembly 100 includes a heat recovery chamber 110 which comprises a cooling intake 112 and an exhaust gas or emissions intake 114 for receiving exhaust gas and waste products emitted as a result of fuel combustion.
- a heat recovery chamber 110 which comprises a cooling intake 112 and an exhaust gas or emissions intake 114 for receiving exhaust gas and waste products emitted as a result of fuel combustion.
- the heat recovery chamber 110 is illustrated in the figures as being cuboid in shape in other aspects the heat recovery chamber 110 has any suitable shape and/or configuration.
- the heat recovery chamber 110 is a cylindrical drum, a pyramid or any other suitable shape. In one aspect, referring to FIG.
- a portion of the heat recovery chamber 110 B may be integral with, for example, the exhaust gas intake 114 or any other suitable ducting so that exhaust from a furnace 2000 or boiler and cooling gas from cooling intake 112 is at least partially mixed within the ducting prior to contacting a heat exchanger, such as a first multiple stage heat exchanger 118 (which includes one or more heat exchange elements 116 A, 116 B), of the multiple stage heat exchange system 120 EX, for recovering heat described below.
- a heat exchanger such as a first multiple stage heat exchanger 118 (which includes one or more heat exchange elements 116 A, 116 B), of the multiple stage heat exchange system 120 EX, for recovering heat described below.
- the heat recovery chamber 110 is an insulated chamber while, in other aspects the heat recovery chamber 110 is uninsulated.
- the heat recovery chamber 110 is made from any suitable material such any suitable non-metallic material, plastics, PVC, ceramics, metals or alloys.
- the heat recovery chamber 110 is made of stainless steel and/or titanium alloy.
- the assembly 100 further includes a portion of the multiple stage heat exchange system 120 EX such as the first multiple stage heat exchanger or absorber 116 (referred to herein as heat exchanger 116 ) noted above.
- the first heat exchanger 116 is disposed within the heat recovery chamber 110 while in other aspects the first heat exchanger 116 is communicably coupled to the heat recovery chamber 110 in any suitable manner.
- a pre-mixing/mixing chamber 110 C in one aspect, is integrated into any suitable ducting so that the exhaust gas and cooling gas are mixed (e.g. pre-mixed) prior contacting the first heat exchanger 116 .
- the first heat exchanger 116 is disposed in a heat recovery chamber 110 B that may be substantially similar to heat recovery chamber 110 however, the exhaust gas, and cooling gas may be substantially combined prior to entering the heat recovery chamber 110 B.
- the heat recovery chamber 110 constitutes a premix chamber 110 A in which cooling gas from the cooling intake 112 and exhaust from the exhaust gas intake 114 mix or otherwise combine.
- the mixed gas flows into the heat exchange chamber 110 B in which the first heat exchanger 116 is disposed.
- the first heat exchanger 116 includes one or more heat exchange elements 116 A, 116 B structured for contacting a mixture made up of cooling gas introduced via the cooling intake 112 and exhaust gas (e.g. made up of carbon emissions) introduced via the exhaust gas intake 114 .
- heat exchange element 116 A is larger than heat exchange element 116 B while in other aspects the one or more heat exchange elements 116 A, 116 B have any suitable size relationship with each other.
- one or more coil sensors CS 1 , CS 2 are in contact with one or more of the heat exchange elements 116 A, 1116 B of the first heat exchanger 116 to relay any problems with the functionality (such as, for example, icing or frosting) of the one or more heat exchange elements 116 A, 116 B of the first heat exchanger 116 to a central logic board (discussed later herein) or any other suitable controller, such as controller 1311 ( FIGS.
- the one or more heat exchange elements 116 A, 116 B of the first heat exchanger 116 are made from any suitable material, such as a metallic or non-metallic material that allows for an exchange of heat.
- the one or more heat exchange elements 116 A, 116 B of the first heat exchanger 116 are constructed of, for example metals and/or alloys, such as but not limited to, copper, aluminum and the like.
- the one or more heat exchange elements 116 A, 116 B of the first heat exchanger 116 is/are heat exchange coil(s) such as an evaporative coil(s) and/or use any suitable coolant or refrigerant such as a single phase coolant.
- the first heat exchanger 116 is illustrated as having two heat exchange elements 116 A, 116 B in FIG. 1 , in other aspects the first heat exchanger 116 has more (see e.g. FIG. 1A ) or less (see e.g. FIG. 10 ) than two heat exchange elements.
- the heat recovery chamber 110 includes a first heat exchanger 116 that includes four heat exchange elements 116 A, 116 B, 116 C, 116 D disposed in sets of two (e.g.
- the recovery chamber 110 includes sub-chambers 110 C 1 , 110 C 2 .
- the furnace exhaust and cooling gas are introduced into sub-chamber 110 C 1 , flow through sub-chamber 110 C 1 and into sub-chamber 110 C 2 where the heat exchange elements 116 A, 116 B, 116 C, 116 D (e.g., of the stage one and stage two fluid circuits 120 , 120 A as described below) are located.
- the stage two fluid circuit 120 A includes one heat exchange element 116 B located in sub-chamber 110 C 1 while the heat exchange elements of the stage one fluid circuit 120 are located in the sub-chamber 110 C 2 .
- the one or more heat exchange elements 116 A, 116 B, 116 C, 116 D have any suitable arrangement within the heat recovery chamber 110 .
- each heat exchange element has, is part of a fluid circuit that is independently operable from other fluid circuits (e.g. each heat exchange element forms part of a separate stage of the multiple stage heat exchanger).
- the cooling intake 112 has any suitable shape and/or configuration and in one aspect structured as a single intake or in other aspects as multiple intakes.
- the cooling intake(s) 112 are configured to introduce one or more of indoor air or cooling gas (which is discharged from the heat recovery chamber 110 and recirculated) into the heat recovery chamber 110 .
- the cooling intake 112 is a closed loop extending from the chamber exhaust 118 to the heat recovery chamber 110 as described below.
- the cooling intake includes an active or passive orifice ORIF (which in one aspect includes a valve 112 V—see FIGS. 1A and 13 ) that is opened and closed to direct any predetermined volume of cooling gas back to the recovery chamber 110 .
- any suitable fan or blowers are provided in any suitable manner to generate a balanced pressure environment within the heat recovery chamber 110 as described herein.
- one or more of the cooling intake(s) 112 are communicably connected to a pressure regulator inducer blower (also referred to herein as a fan) 140 (see e.g. FIG.
- the inducer blower 140 is located on the exhaust side of the heat recovery chamber 110 as will described below while in other aspects the inducer blower is located at any suitable location.
- the fan 140 includes a variable speed motor that is controlled by any suitable sensors in communication with an interior of the heat recovery chamber 110 and configured to detect proper temperature and/or humidity and/or pressure of the gas inside the heat recovery chamber 110 .
- the one or more heat exchange elements 116 A 116 B of the first heat exchanger 116 are interconnected in any suitable manner to a respective stage of a multi-stage fluid circuit system.
- heat exchange element is connected to stage one fluid circuit 120 and heat exchange element is connected to stage two fluid circuit 120 A (e.g. each heat exchange element is interconnected with a fluid circuit that is separate and distinct (e.g. independently operable) from other fluid circuits of other heat exchange elements where each fluid circuit has its own compressor 150 , 150 A) where the fluid circuits 120 , 120 A are any suitable fluid circuits.
- the one or more heat exchange elements 116 A, 116 B are interconnected to a common fluid circuit such that coolant is shared between the one or more heat exchange elements 116 A, 116 B.
- the respective fluid circuit(s) 120 , 120 A include any suitable conduit 122 , 122 A for conveying fluid within the respective fluid circuit 120 , 120 A.
- the multiple stage heat exchanger system 120 EX of the assembly 100 includes a second multiple stage heat exchanger or emitter 130 (e.g.
- heat extraction exchanger including one or more heat exchange elements 130 A, 130 B disposed exterior to the heat recovery chamber 110 such that each heat exchanger 130 A, 130 B of the second multiple stage heat exchanger 130 (referred to herein as heat exchanger 130 ) is in fluid communication with a respective fluid circuit 120 , 120 A via the respective conduit 122 , 122 A.
- heat exchange element 130 A of the second heat exchanger 130 and heat exchange element 116 A of the first heat exchanger 116 are communicably interconnected via the conduit 122 of the fluid circuit 120 such that the heat exchange element 116 A of the first heat exchanger 116 contacts or otherwise interfaces with (e.g.
- heat exchange element 130 A of the second heat exchanger 130 contacts or otherwise interfaces in any suitable manner with air to be heated, outside of the heat recovery chamber 110 .
- heat exchange element 130 B of the second heat exchanger 130 and heat exchange element 116 B of the first heat exchanger 116 are communicably interconnected via the conduit 122 A of the fluid circuit 120 A such that the heat exchange element 116 B of the first heat exchanger 116 contacts or otherwise interfaces with (e.g.
- the heat exchange element 116 A, fluid circuit 120 and heat exchange element 130 A constitute the first stage of the multiple stage heat exchange system 120 EX and the heat exchange element 116 B, fluid circuit 120 A and heat exchange element 130 B constitute the second stage of the multiple stage heat exchange system 120 EX.
- the one or more heat exchange elements 130 A, 130 B of the second heat exchanger 130 are, in one aspect, condenser coils having any suitable size(s), shapes and/or arrangement.
- the heat exchange element 130 A includes two heat exchange elements 130 A 1 , 130 A 2 coupled together in series to form a slab condenser coil.
- the two heat exchange elements 130 A 1 , 130 A 2 of the heat exchange element 130 A include vertical pipes and horizontal fins.
- the heat exchange element is a single heat exchange element having horizontal pipe and vertical fins or vortical pipe and horizontal fins.
- the heat exchange element 130 B is smaller than heat exchange element 130 A and in one aspect includes horizontal pipes and vertical fins or vertical pipes and horizontal fins.
- the pipe and fin arrangement of the one or more heat exchange elements 130 A, 130 B is such that the pipes and fins of heat exchange element 130 A intersect the pipes and fins of heat exchange element 130 B (e.g. where heat exchange element 130 A includes horizontal pipes and vertical fins the heat exchange element includes vertical pipes and horizontal fins) to facilitate a maximized heat transfer through the one or more heat exchange elements 130 A, 130 B.
- the heat recovery chamber 110 includes exhaust and drainage components.
- An exhaust 118 for discharging the exhaust gas (e.g. a portion of which is recirculated as cooling gas) after heat exchange occurs is configured or otherwise structured to interconnect, for example, the heat recovery chamber 110 to the outside environment and/or to cooling intake 112 for recirculating at least a portion of the exhaust gas (e.g. the cooling gas) back into the heat recovery chamber 110 as will be described in greater detail below.
- the heat recovery assembly/system 100 when combined with, for example, a furnace 2000 having about an 80% efficiency produces exhaust gas temperatures (As described herein) that enable the exhaust duct (e.g. exhaust 118 ) to be formed of PVC rather than metal of ceramic (e.g.
- the exhaust 118 is a single two-inch pvc vent pipe while in other aspects the exhaust 118 has any suitable size and is constructed of any suitable material such as composites, metals, etc.
- a drain 111 is connected to the heat recovery chamber 110 and is configured to carry condensate water WD that may include particulates, ash and/or soot out of the heat recovery chamber 110 .
- a mister 113 is included in the heat recovery chamber 110 , however in other aspects the mister 113 is not provided.
- the mister 113 is configured to saturate the gas within the heat recovery chamber 110 with moisture and to help capture and remove particulates, ash and/or soot from the exhaust gases in any suitable manner, such as by the particulates, ash and/or soot becoming saturated with water from the flash heat steam from, for example, the super heated oil combustion exhaust gas and falling to the bottom of the chamber to be discharged through the drain 111 .
- the mister 113 may not be provided such that the condensate water WD is formed from moisture in the exhaust gas and/or cooling gas introduced through cooling intake 112 and helps capture and remove particulates, ash and/or soot from the exhaust gases.
- a filter or other mechanical separation unit is provided to remove the particulates, ash and/or soot from the condensate water WD discharged through the drain 111 .
- the mister 113 is, in one aspect, connected to a pressurized water tube to provide water to the heat recovery chamber 110 to raise the dew point within the heat recovery chamber 110 to raise the heat transfer potential.
- FIG. 1 The aspects of the disclosed embodiment illustrated in FIG. 1 are designed for use when the exhaust gas input through the exhaust gas intake 114 originates from the burning of cleaner burning propane or other natural gases, such as but not limited to, a natural gas-burning furnace component of a heating, ventilation and air conditioning (HVAC) unit.
- HVAC heating, ventilation and air conditioning
- the assembly 100 could be utilized in other situations where the surrounding air is to be heating by fossil fuel combustion.
- FIG. 2 illustrates an aspect of the disclosed embodiment of the assembly 100 that may be used when the exhaust gas input to the heat recovery chamber 110 through the exhaust gas intake 114 originates from an oil-burning furnace.
- this aspect of the disclosed embodiment may also be used when the exhaust gas input to the heat recovery chamber 110 through the exhaust gas intake 114 originates from burning of natural gas as well.
- the components and configuration of this aspect of the disclosed embodiment are generally the same as in FIG. 1 ; however, additional aspects are included for capturing the heat that is stored in the condensate water WD that may accumulate within, such as at the bottom, of the heat recovery chamber 110 . While the capturing of heat stored in the condensate water WD is described with respect to the heat recovery chamber 110 in FIG.
- FIG. 2 it should be understood that, in other aspect, capturing heat stored in condensate water WD in the heat exchange chamber 110 B (see e.g. FIGS. 11 and 12 ) is provided in a manner substantially similar to that described herein.
- heat captured in the condensate water WD may be recovered from the heat recovery chamber 110 , 110 B.
- the aspects of the disclosed embodiment illustrated in FIG. 2 include a third heat exchanger 117 in fluid communication with one or more of the first heat exchanger 116 and the second heat exchanger 130 via a second conduit 124 for absorbing the excess heat stored in the water as it accumulates from the condensate water WD produced within the heat recovery chamber.
- the drain 111 in FIG. 2 is shown, for exemplary purposes, to be structured such that condensate water WD and ash/soot within the condensate water WD does not drain from the heat recovery chamber 110 until the water rises to a certain level, WL.
- the third heat exchanger 117 allows the third heat exchanger 117 to remain underneath the surface of the condensate water WD as it absorbs the excess heat energy stored in the condensate water WD so that very little, or none, of the heat energy remains unabsorbed in the entire process (e.g. substantially all heat energy is extracted from the condensate water WD).
- hot exhaust gases and combustion products (carbon monoxide, carbon dioxide, H20, etc.) are exhausted into the heat recovery chamber 110 .
- one or more of indoor air and cooling gas is introduced into the heat recovery chamber 110 in any suitable manner to mix with the hot exhaust gas.
- a large, cubic footprint of gas is saturated and heated as a result of the mixing. This mixture flows across one or more heat exchange elements 116 A, 116 B of the first heat exchanger 116 while the dew point rises, holding water and heat (saturation).
- the heat is extracted from the mixture via the one or more heat exchange elements 116 A, 116 B of the first heat exchanger 116 (and third heat exchanger 117 when provided) and transferred to a respective one of the one or more heat exchange elements 130 A, 130 B of the second heat exchanger 130 such that heat transfer occurs at the one or more heat exchange elements 130 A, 130 B of the second heat exchanger 130 to heat, for example, indoor air or any other suitable medium.
- Cooler, dry gas from the heat recovery chamber 110 is exported outdoors in any suitable manner, such as through any suitable chimney or exhaust flue, with a reduced heat, moisture and carbon content.
- at least a portion of the cooler, dry gas from the heat recovery chamber 110 is recirculated (e.g.
- cooling gas back into the heat recovery chamber 110 .
- This process allows heat energy to be pulled from the gas introduced into the heat recovery chamber such that it is compounded with the heat energy already being produced by the fossil fuel combustion process.
- This provides the assembly and system described herein in accordance with the aspects of the disclosed embodiment the potential to achieve a higher efficiency of fuel burn.
- Hot, moist exhaust, gases are extracted from the furnace at approximately 375° F. with approximately 90% plus humidity at approximately 55CFM.
- the exhaust gases have any suitable temperature and humidity and are extracted at any suitable rate.
- the hot, water-saturated, exhaust gas carries a large heat potential (of e.g. at least 20,000 British Thermal Units per Hour (BTUH)).
- BTUH British Thermal Units per Hour
- the water-saturation of the exhaust gas includes high levels of potential energy for extraction.
- cool gas e.g. the cooling gas
- CFM cubic feet per minute
- the cool dry gas e.g. cooling gas
- the pressure regulation of the heat recovery assembly 100 effected by a balanced pressure system where the fan 140 is placed downstream of the heat recovery chamber 110 so as to draw or suck the gasses out of the heat recovery chamber 110 .
- the fan 140 is sized so as to be substantially equal to two-times the cfm of the furnace inducer fan motor so that the discharged exhaust gas from the heat recovery chamber is split so that substantially half the discharged exhaust gas (e.g. cool dry gas or cooling gas) is returned to the heat recovery chamber to cool and be mixed with the gases from the furnace 2000 that enter the heat recovery chamber through gas intake 114 .
- the fan 140 B is sized to recover any suitable portion of the discharged exhaust gas from the heat recovery chamber for mixing with and cooling the gases from the furnace 2000 input to the heat recovery chamber 110 through gas intake 114 .
- mixing the gases from the furnace with the cooling gas from the heat recovery chamber 110 substantially eliminates any influence of fluctuating outdoor temperatures on the heat recovery assembly 100 and substantially isolates the furnace from outdoor pressure/wind influences.
- the fan(s) 140 controlled in any suitable manner, such as by controller 1311 and/or by a rheostat to allow balancing of gas flow volume and velocity through the heat recovery assembly 100 .
- the cooling gas is saturated by the misted water within the exhaust gas, resulting in an increase in the dew point while in other aspects the cooling gas is not misted.
- the heat energy released in the exhaust gas (which may have a temperature of approximately 375° F. or any other suitable temperature) mixes with the cooling gas, resulting in a mean temperature of approximately 160° F. (or any other suitable temperature).
- the combined gases include oxygen (O 2 ) assisting in the heat transfer process.
- the combined gases are a warm (about 160° F. or other suitable temperature), high dew point gas having, for example, a high-energy potential for high efficiency heat and energy extraction.
- This combined gas mixture passes over one or more of the heat exchange elements 116 A, 116 B of the first heat exchanger 116 .
- the fluid, e.g. refrigerant, in the one or more heat exchange elements 116 A, 116 B of the first heat exchanger 116 is under controlled pressurized conditions and is able to extract a large amount of heat energy from the combined gas mixture and transfer the heat energy to the a respective one of the one or more heat exchange elements 130 A, 130 B of the second heat exchanger 130 via the respective fluid circuit 120 , 120 A such that the transferred heat energy warms the indoor air as the indoor air flows over the one or more heat exchange elements 130 A, 130 B of the second heat exchanger 130 .
- the flow of refrigerant in the fluid circuit 120 , 120 A between each of the components of the assembly is illustrated by arrows in FIG. 3 .
- the exhaust gas discharged from the heat recovery chamber following the controlled and regulated mixing within the heat recovery chamber 110 may be dry, cool exhaust gas.
- the average discharged exhaust gas from the heat recovery chamber 110 has a temperature of about 42° F. to about 49° F., a humidity of about 10%, and about a 0.05-0.00 PPM CO (carbon monoxide) content.
- one or more suitable thermostat or temperature sensor TS is mounted on the furnace supply plenum or duct 1301 (and/or on the furnace return plenum 1300 ) and is positioned outside of any thermal influence of the heat that radiates from the thermal mass of the one or more heat exchange elements 130 A, 130 B.
- the thermostat TS is connected to the controller 1311 in any manner so as to effect operation of the heat recovery system 100 as described herein.
- the controller 1311 is in a monitoring state that monitors a state of the furnace 2000 and one or more thermostats TSH that control the heating in one or more heating zones of a building or other area to be heated ( FIG. 18A , Block 9000).
- the one or more thermostats TSH detect a temperature that is less than a predetermined set temperature of the thermostat TSH the thermostat sends any suitable signal to the controller 1311 .
- the controller 1311 detects the signal and the heat call embodied in that signal ( FIG. 18 , Block 9001 ).
- the controller 1311 is, in one aspect, configured to determine if the heat call is a false alarm. Where the heat call is a false alarm the controller 1311 returns to the monitoring state ( FIG. 18 , Block 9002 ). Where the heat call is valid the controller 1311 forwards the heat call to the furnace controller 1311 F to effect turning the furnace 2000 and the fan 140 on ( FIG. 18A , Block 9003 ). The controller 1311 is also configured to determine if the heat call remains active ( FIG. 18A , Block 9005 ). In one aspect, the controller 1311 waits any suitable predetermined time period before determining if the heat call remains active ( FIG. 18A , Block 9004 ). If the heat call is no longer active the controller 1311 turns the furnace 2000 off ( FIG.
- the controller 1311 determines if the heat call remains active ( FIG. 18A , Block 9010 ). Where the heat call is inactive the controller 1311 turns the furnace 2000 , the fan 150 , 150 A and the compressors 150 , 150 A off ( FIG. 18A , Block 9011 ) and returns to the monitoring state ( FIG. 18A , Block 9007 ).
- the controller 1311 waits any suitable predetermined amount time period between the starting of compressor 150 and the starting of compressor 150 A.
- the controller 1311 determines if the heat call remains active ( FIG. 18A , Block 9010 ). Where the heat call is inactive the controller 1311 turns the furnace 2000 , the fan 150 , 150 A and the compressors 150 , 150 A off ( FIG. 18A , Block 9011 ) and returns to the monitoring state ( FIG.
- the controller 1311 monitors whether the thermostat TSH temperature is satisfied ( FIG. 18B , Block 9015 ). Where the thermostat TSH temperature is satisfied the controller 1311 turns the compressors 150 , 150 A, the fan 140 and the furnace off ( FIG. 18B , Blocks 9016 , 9018 ) and returns to the monitoring state 9019 . In one aspect the controller 1311 waits any suitable time period before turning the fan 140 off ( FIG. 18B , Block 9017 ). If the thermostat TSH temperature is not satisfied the controller determines, from any suitable temperature sensors whether the one or more heat exchange elements, such as heat exchange elements 116 A, 116 B, require defrosting ( FIG. 18B , Block 9020 ).
- the controller 1311 determines if the call for defrosting is valid such that if the call for defrosting is not valid the controller 1311 returns to the active state ( FIG. 18B , Block 9021 ). Where the call for defrosting is valid the controller 1311 turns the compressor(s) 150 , 150 A off ( FIG. 18B , Block 9022 ), waits a predetermined amount of time suitable for defrosting (e.g. a defrost cycle) the one or more heat exchange elements 116 A, 116 B ( FIG. 188 , Block 9023 ) and returns to the monitoring state ( FIG. 18B , Block 9024 ).
- a predetermined amount of time suitable for defrosting e.g. a defrost cycle
- the controller 1311 determines if the furnace 2000 has failed ( FIG. 18B , Block 9026 ).
- the controller 1311 determines if the furnace fall call is valid and if the furnace fail call is not valid the controller 1311 returns to the active state ( FIG. 18B , Block 9027 ). If the controller 1311 determines that the furnace fail call is valid the controller 1311 turns the compressor(s) 150 , 150 A and the furnace 2000 off ( FIG. 18B , Block 9028 ) and waits a predetermined period of time ( FIG. 18B , Block 9029 ) before turning the fan 140 off ( FIG. 18B , Block 9030 ) and returning to the monitoring state ( FIG. 18B , Block 9031 ). Where there is no furnace fail call the controller determines if the heat recovery assembly 100 has failed (e.g. the controller receives a heat recovery assembly fail call from any suitable sensors connected to the heat recovery assembly 100 ) ( FIG. 18B , Block 9032 ).
- the controller 1311 determines if the heat recovery assembly fail call is valid and if the heat recovery assembly fail call is not valid the controller 1311 returns to the active state ( FIG. 18B , Block 9033 ). If the controller 1311 determines that the heat recovery assembly fail call is valid the controller 1311 turns the compressor(s) 150 , 150 A and the furnace 2000 off and turns the fan 140 on ( FIG. 18B , Block 9034 ). The controller effects any suitable aural and/or visual alert indicating a reset of the heat recovery assembly 100 is needed ( FIG. 18B , Block 9035 ) and when the heat recovery assembly 100 is reset the controller 1311 returns to the monitoring state ( FIG. 18B , Block 9036 ). If there is no heat recovery assembly fail call the controller 1311 enters, a heat cycle mode ( FIG. 18B Block 9037 ).
- a temperature sensor TS is mounted on or within the furnace supply plenum or duct 1301 of the furnace 2000 .
- the furnace 2000 is burning gas (e.g. is turned on the heat recovery assembly 100 is extracting heat from the furnace exhaust gas and preheating the air in the return plenum 1300 so that hot air is produced at elevated temperatures compared to the furnace 2000 running by itself.
- the sensor TS is monitored by the controller 1311 ( FIG. 18C , Block 9038 ) and is set to trigger or otherwise send a signal to the controller at any suitable predetermined high temperature threshold or set point, such as about 130° F.
- the high temperature threshold is more or less than 130° F.
- the controller 1311 receives a signal from the temperature sensor TS that the high temperature threshold is reached the controller interrupts the thermostat TSH heat call which closes the furnace fuel valve FV and shuts off the burners FBRN (e.g. turns the furnace off however, the blower FIB remains running for a predetermined period of time per furnace programming as described herein) and turns the stage 2 compressor 150 A off ( FIG. 18C , Block 9039 ).
- the heat recovery assembly 100 leverages the furnace programming (e.g.
- the embedded furnace controller 1311 F incorporates the embedded furnace controller 1311 F that continues to run the blower FIB for a predetermined period of time, as described above, after the burners FBRN are turned off) and continues to extract and transfer heat from the residual heat from the furnace 2000 in the chamber 110 and into the supply air stream (e.g. the blower FIB continues to operate so that air moves over/through the heat exchanger(s) 130 A, 130 B, FH X while the heat being transferred from the heat exchanger 116 A decreases).
- the temperature sensor TS in the supply plenum 1301 is further configured to send a signal to the controller 1311 indicating a predetermined low temperature threshold or set point, such as about 100° F. (in other aspects the low temperature threshold is more or less than 100° . F).
- the controller 1311 monitors the temperatures sensor TS for a low temperature threshold signal ( FIG. 18C , Block 9040 ) and if the low temperature threshold signal is received by the controller 1311 , the controller 1311 reinstates the thermostat TSH heat call so that the furnace 2000 and the stage 2 compressor 150 A are turned on ( FIG. 18C , Block 9041 ) and the process returns to block 9038 so that the furnace is discontinuously run in short bursts so that the furnace is cycled between the on and off states during the heat call.
- the low temperature threshold is such that the low temperature threshold is reached before the blower FIB turns off so that air is continually circulating through the furnace heat exchanger FHX for delivering heat to the supply air during the heat call whether the burners FBRN are lit or off.
- the controller 1311 includes any suitable programming for turning the burners FBRN back on prior to the blower FIB being turned off (e.g. if the low temperature threshold is not met or for any other suitable reasons). If the low temperature threshold signal is not received the controller 1311 monitors the furnace blower timeout (e.g. the period of time the blower FIB operates after the burners FBRN are turned off) ( FIG. 18C , Block 9040 A).
- a predetermined time period prior e.g. any suitable time period such as seconds before the expiration of the timeout, a minute before the timeout, etc.
- the controller 1311 continues to monitor for the low temperature threshold signal. If the predetermined time period prior to the timeout period expiring has been reached ( FIG. 18C , Block 9040 B) the controller 1311 reinstates the thermostat TSH heat call so that the furnace 2000 and the stage 2 compressor 150 A are turned on ( FIG. 18C , Block 9041 ) and the process returns to block 9038 so that the furnace is discontinuously run in short bursts so that the furnace is cycled between the on and off states during the heat call.
- a predetermined time period prior e.g. any suitable time period such as seconds before the expiration of the timeout, a minute before the timeout, etc.
- thermostat TSH heat call If the thermostat TSH heat call is satisfied the controller 1311 returns to the monitoring state and the furnace 2000 , compressor(s) 150 , 150 A and fan 140 are turned off ( FIG. 18C , Block 9042 ).
- the monitoring of the temperature sensor TS in the supply plenum 1301 effects a repeating on/off cycling of the furnace burners FBRN (e.g. the furnace is cycled between being turned on and being turned off) until the thermostat TSH heat call is satisfied which shuts the furnace 2000 and the heat recovery assembly 100 down until the next thermostat TSH heat call.
- the controller 1311 is coupled to the temperature sensor TS having predetermined hi and low temperature set points and is configured or otherwise programmed so that in response to the heat call from the thermostat TSH the furnace is repeatedly cycled (e.g. run discontinuously or turned on and off) when the controller 1311 registers the temperature sensor TS signal corresponding to the hi temperature set point (e.g. the furnace is turned off) and the low temperature set point (e.g. the furnace is turned on).
- the following is an exemplary table illustrating tests performed on various furnaces where the input/size is the btu rating of the furnace tested, cfm is the amount of air moved by the furnace tested, target is the targeted btus from the heat recovery assembly/system 100 to be added to the furnace heat output, the cycles per hour is the number of times the furnace tested was discontinuously run (e.g.
- the average supply temperature (° F.) is the average temperature of the air passing through the return plenum 1300 during both furnace on and off states/periods
- the average return temperature (° F.) is the average temperature of the air returning to the return plenum 1300 during both furnace on and off states/periods
- the average delta temperature (° F.) is the difference between the average supply temperature and the average return temperature
- the added btus are the btus recovered by the heat recovery assembly/system 100 described herein and the fuel btus is the amount of btus obtained from burning fuel during furnace on states/periods
- efficiency is the fuel conversion efficiency of the furnace with the heat recovery assembly/system 100
- variation is the difference between the target btus and the added btus
- on second refers to the amount of firm the furnace was in the on state during each cycle of the discontinuous furnace operation
- off seconds refers to the amount of time the furnace was in the off state during each cycle of the discontinuous furnace operation
- latent refers to an amount of heat (btus) of e-strained water and recovered by the heat recovery assembly/system 100 throughout the heating cycle
- source is the amount of heat (btus) recovered by the heat recovery assembly/system 100 during furnace operation
- residual is the amount of heat (btus) recovered by the heat recovery assembly/system 100 during furnace cool down periods.
- the discontinuous operation e.g. cycling between on and off states
- the discontinuous operation of the furnace during a heat call decreases an amount of fuel used during the heat call while the heat recovered during the latent, source and residual heating periods by the heat recovery assembly/system 100 increases the fuel conversion efficiency of the furnace 2000 .
- one or more stages of the multiple stage heat exchanger 120 EX operate as described herein to increase, balance or otherwise continue heat transfer to the return air travelling through the return plenum 1300 for heating the supply air delivered to the habitat through the supply plenum 1301 .
- the stage one compressor 150 runs substantially 100% of the time (e.g. when the furnace is on and when the furnace is off) the during a full thermostat heat call cycle (e.g. a duration of the heat call) so as to extract heat (e.g.
- the secondary compressor 150 A only runs while the furnace is turned on (e.g. the furnace burners FBRN are lit) while in other aspects the secondary compressor 150 A also runs when the furnace burners FBRN are not lit (e.g. the furnace is turned off).
- the first and second stages of the heat exchange system are operated at any suitable times, either together or individually, during the heat call. For example, in one aspect, only stage one operates during furnace off times and only stage two operates during furnace on times or vice versa. In another aspect, stage one operates to a point where a temperature of the supply air reaches a predetermined temperature at which time stage one is turned off and stage two is turned on, or vice versa.
- the controller 1311 is configured to stagger a starting of the stage one compressor 150 and the stage one compressor 150 A to, for example, avoid a combined electrical surge of the compressors 150 , 150 A.
- the heat recovery assembly/system 100 described herein is adapted to attach to or otherwise interface with any suitable furnace having any age or configuration.
- the assembly 100 may be attached to a furnace with about 78% AFUE or higher efficiency, resulting in an increased efficiency of the system. Carbon discharge, exhaust gas temperature, and humidity may also be reduced if the assembly 100 is employed with a furnace.
- a pressure sensors S 5 placed the heat recovery chamber exhaust 118 and is connected to the controller 1311 in any suitable manner (such as through a wired or wireless connection).
- the pressure sensors S 2 is configured to monitor an exhaust vent pressure of the furnace 2000 and/or heat recovery assembly 100 and send any suitable signal to the controller to turn the furnace off if the exhaust vent pressure exceeds a predetermined pressure and to turn the furnace back on if be exhaust, vent pressure falls below the predetermined pressure.
- the controller 1311 is configured to, based on the signals from the sensor S 2 , to turn off the furnace 2000 by interrupting the heat call from the thermostat TSH.
- a temperature sensor S 3 is disposed in the heat recovery chamber exhaust 118 and is connected to the controller 1311 for monitoring the exhaust gas exiting the heat recovery chamber. Where the sensor S 3 detects the exhaust gas has a temperature above any suitable predetermined threshold temperature the controller 1311 is configured to, based on the sensor S 3 signals, turn off the furnace 2000 by interrupting the heat call from the the at TSH.
- a temperature sensor S 1 is disposed in the furnace exhaust 2100 /intake 114 and is connected to the controller 1311 for monitoring a temperature of the exhaust gas entering the heat recovery chamber from the furnace 2000 (or in other words monitoring of the exhaust gas exiting the furnace 2000 ).
- each fluid circuit 120 , 120 A includes a temperature sensor S 5 , S 6 for monitoring a temperature of the cooling fluid within the respective fluid circuit 120 , 120 A.
- the temperature sensors S 5 , S 6 are connected to the controller 1311 and suitable signals to the controller when, for example, a low temperature threshold is met so that the controller 1311 effects a defrosting of the heat exchange elements 116 A, 116 B in any suitable manner.
- the system 200 may include a furnace 2000 comprising an exhaust 2100 and a furnace intake 2300 .
- the system 200 further includes heat recovery chamber 110 having a cooling intake 112 and an exhaust gas intake 114 .
- the system 200 may include a premix chamber 110 A, 110 C and a heat exchange chamber 110 B as described above with respect to FIGS. 11 and 12 .
- the exhaust gas intake 114 may be configured to be communicably coupled to (e.g. in communication with) the exhaust 2100 of the furnace to receive exhaust gas resulting from fuel combustion in the furnace 2000 .
- a first heat exchanger 116 A may be disposed within the heat recovery chamber 110 and is in fluid communication with a fluid circuit 120 that includes a conduit 122 configured to convey a fluid therein, such as a refrigerant.
- the first heat exchanger 116 which includes heat exchange element 116 A, may be communicably disposed outside the heat recovery chamber.
- the first heat exchanger 116 may be configured such that during operation of the furnace 2000 it is in thermal communication with a mixture comprising cooling gas introduced via the cooling intake 112 and exhaust gas introduced via the exhaust gas intake 114 that is connected to the furnace exhaust 2100 .
- the system 200 may include a second heat exchanger 130 , which includes heat exchange element 130 A, in fluid communication with the fluid circuit 120 and disposed in thermal communication with an airstream being drawn into the furnace for heating (see INDOOR AIR passing through the second heat exchanger 130 in FIG. 5 ).
- Refrigerant is heated in the first heat exchanger 116 and moved to the second heat exchanger 130 via the pressure gradient created by the heat exchange and, optionally, with assistance from any suitable compressor such as the micro-compressor or the like (as described above), where heat exchange occurs between the airstream flowing from the indoor air source and the second heat exchanger 130 .
- the preheated air from the second heat exchanger 130 is directed into the heat exchanger 2200 of the furnace such that the air is further heated and then directed into the home or other habitable structure for heating the home or other habitable structure.
- the system 200 may include a drain 111 exiting the heat recovery chamber 110 .
- the drain 111 may be substantially similar to that described above and structured as, for example, in FIG. 1 or FIG. 2 , depending on the type of furnace being utilized in the system 200 (as explained previously herein).
- a system 200 including the drain 111 as illustrated in FIG. 2 would include a third heat exchanger 117 as previously described herein.
- the system 200 may also include any suitable compressor 150 that may be substantially similar to that previously described herein.
- the compressor may be a micro-compressor to aid in energy conservation.
- a furnace inducer blower, IB may be in connection with the furnace exhaust 2100 to actively draw exhaust from the furnace 2000 into the exhaust gas intake 114 of the heat recovery chamber 110 .
- the assembly 100 and system 200 of the disclosed embodiment may further include a heat recovery ventilator.
- Heat recovery ventilators have been a known art in the HVAC industry for many years: however, the typical ventilator is much less efficient and structurally different than the aspects of the disclosed embodiment in combination with the assembly and system herein.
- a conventional Heat Recovery Ventilator (HRV) draws in fresh outdoor air to replace exhausted indoor air.
- the HRV helps create air exchanges within home or building structures which in turn helps to reduce pollutants, smoke, contaminants, airborne allergies, viruses, etc. from collecting within the home or building ventilation systems.
- fans and heat exchangers will pass heated or cooled indoor air over unconditioned outdoor air. The two air masses never combine but are separated by heat exchangers.
- This process can transfer as much as 85% of the heat energy from the conditioned air mass to the unconditioned air mass. About 15% of the energy is lost in this process, causing the home or building owner the expense of heating or air conditioning that loss to the newly introduced unconditioned air in order to maintain the same comfort level within the structure.
- a heat recovery system 200 ′ is illustrated in accordance with aspects of the disclosed embodiment.
- the heat recovery system 200 ′ is substantially similar to heat recovery system 200 described above with respect to FIGS. 5 and 10 however, in this aspect the heat recovery system also includes the stage two cooling circuit 120 A as described above.
- the first heat exchanger 116 of the heat recovery system 200 ′ includes heat exchange elements 116 A and 116 B disposed in the heat recovery chamber 110 and the second heat exchanger 130 includes heat exchange elements 130 A and 130 B through which the indoor air passes for pre-heating the indoor air.
- the cool, dry exhaust gas e.g.
- cooling gas introduced in the heat recovery chamber through cooling intake 112 is, in one aspect mixed with recovery indoor air introduced into the cooling intake 112 in any suitable manner such as by any suitable fan while in other aspects, the recovery air is omitted.
- the fan or blower 140 is positioned to suck or draw the gases through the heat recovery chamber 110 while in other aspects, the fan is located in any suitable location for moving the gases through the heat recovery chamber 110 .
- FIG. 6 illustrates a heat recovery ventilator (HRV) assembly 160 configured in relation to a heat recovery assembly 100 for providing fresh outdoor air to the interior environment in accordance with aspects of the disclosed embodiment.
- the HRV contains a ventilator outdoor air intake 162 that is structured to be in communication with the second heat exchanger 130 for heating outdoor air as it is drawn into the air intake of a heating apparatus or furnace.
- the HRV provides clean, outdoor air for circulation within the home or building. It directs the air into the airstream being drawn across the second heat exchanger 130 such that it can be heated by the energy efficient process of the heat recovery assembly 100 or system 200 , as previously described herein.
- the HRV assembly 160 may include a motorized damper 164 in communication with the outdoor air intake 162 such that the flow of outdoor air is regulated.
- a thermostat 166 may be in communication with the motorized damper 164 for controlling the opening and closing of the damper 164 based on the outdoor air temperature.
- the damper 164 may allow air temperatures ranging from about 10° F. to about 70° F. to pass therethrough. In other aspects the damper 164 may allow air having any suitable temperature to pass therethrough.
- the thermostat 166 may include a temperature sensor 168 to communicate the outside air temperature.
- the inducer blower, such as fan or blower 140 B is located on an outlet side (e.g.
- the fan is located at any suitable location for moving gas through the heat recovery chamber.
- FIG. 7 illustrates an electrical wiring diagram of a heat and energy recovery system in accordance with aspects of the disclosed embodiment.
- the diagram illustrates the connections between a logic board or other suitable controller 1311 of the system and the furnace control board and thermostat of an HVAC system.
- the logic board or controller 1311 may include a LCD scroll display 171 for a visual depiction of the operational parameters of the system. Heat recovery, troubleshooting, and normal operating conditions may be indicated by LED lights (see “POWER”, “TROUBLE”, “COMP1” and “COMP2”) or in any other suitable visual and/or aural manner.
- Various connections between sensors and switches are also depicted.
- the inducer blower or fan and micro-compressor connections and requisite relays are also depicted but may not be provided such as when the system does not include an inducer blower or compressor. Connections between one or more components of the system may be wired with the controller 1311 to provide centralized control and functionality of the system.
- FIGS. 8A, 8B and 9 illustrate operational aspects of the heat and energy recovery system 200 with a furnace 2000 in accordance with the disclosed embodiment.
- the system 200 may be adapted to fit on the furnace unit either on a wall of the ( FIG. 8A ) or in line with the air intake (e.g. return plenum) of the furnace ( FIG. 9 ).
- the system 200 may have any suitable positional relationship relative to the furnace 2000 .
- a cut-away illustration is shown in FIG. 10 where, in one aspect of the disclosed embodiment, the system 200 is structured to be in line with the furnace intake 2300 (which is substantially similar to return plenum 1300 ) for receiving air as it is drawn into the furnace 2000 .
- FIG. 8A different configurations with respect to the placement of the return plenum 1300 , the recovery chamber 110 and the first and second heat exchangers 116 , 130 relative to the furnace 2000 .
- the heat recovery system 100 , 200 , 200 ′ may substantially be a modular unit that can be connected to, for example, furnace 2000 having a common housing 200 HA (such as that shown in FIG. 9 ) in which at least the first and second heat exchangers 116 , 130 are located.
- the heat recovery system 100 , 200 , 200 ′ has a two part modular configuration such that the first heat exchanger 116 is included in one modular 200 A unit having a first housing 200 HB and the second heat exchanger is included in another modular unit 200 B having a second housing 200 HC that can be placed at different locations relative to each other and/or the furnace 2000 or boiler such as illustrated in FIG. 8A .
- the heat recovery system 100 , 200 , 200 ′ includes more than two modules where each module includes one or more of the heat exchange elements of the first and second heat exchangers 116 , 130 , for example, additional heat exchangers and/or other components of the heat recovery system 100 , 200 may be disposed in respective modular units each having a respective housing for placement at any suitable location relative to other modular units.
- the modular unit 200 A may include the first heat exchanger 116 , the recovery chamber 110 and any other suitable components of the heat recovery system 100 , 200 , 200 ′ such as one or more of the features illustrated in FIGS. 7, 7A and 7B .
- the modular unit 200 B may include the second heat exchanger 130 disposed within housing 200 HC.
- the modular units 200 A, 200 B may be placed at any suitable locations relative to each other and/or the furnace 2000 (or boiler) which in one aspect may depend on available space in the installation location of the heat recovery system 100 . 200 .
- At least a portion of the heat recovery system may be integrated within a housing 2000 H of the furnace 2000 .
- the housing 2000 H may house combustion chamber 2000 CH and at least the first heat exchanger 116 so that the furnace 2000 has an integral refrigerant heat exchange.
- the first heat exchanger may be disposed within a heat exchange chamber 110 B (e.g. substantially similar to that described with respect to FIG. 12 ) where a gas inlet is provided at least partly in the housing 2000 H for transferring combined exhaust gas and cooling gas to the first heat exchanger from the exhaust gas inlet 114 and cooling intake 112 .
- the first heat exchanger 116 may be disposed within the heat recovery chamber 110 (which is disposed within the housing 2000 CH) while in other aspects the heat recovery chamber 110 , 110 B may be separate from a heat exchange chamber 110 B (where the first heat exchanger is located within the heat exchange chamber 110 B) as described above with respect to FIGS. 11 and 12 .
- the heat recovery chamber 110 , 110 B and the heat exchange chamber 110 B may be disposed within the housing 1200 CH such that the exhaust inlet 114 and cooling intake 112 (located at least partly within the housing) provide exhaust gas and cooling gas to the combining chamber.
- the housing may also house the second heat exchanger 130 that is communicably connected to the first heat exchanger through one or more of conduits 120 , 120 A.
- the return plenum 1300 returns air from the heating space to the furnace to be heated.
- outdoor or ventilation air may be introduced to the return air through duct 1303 which may include a blower or fan (in other aspects a fan may not be provided) for moving the outdoor air into the return plenum 1300 .
- the modular unit 200 B may be located, for example, between the furnace 2000 and the return plenum 1300 , within an internal passage of the return plenum 1300 and/or in-line with the return plenum 1300 .
- heat from the second heat exchanger 130 may be transferred to the return air for heating or otherwise pre-heating the return air prior to heating the air with the furnace 2000 .
- the heated air may be transferred through the supply plenum 1301 back to the heating space.
- any suitable filter 1302 may be disposed in or in-line with the return plenum 1300 so that filtered air is provided for contacting the second heat exchanger 130 .
- the modular unit 200 A may be located at any suitable location relative to one or more of the modular unit 200 B and the furnace 2000 .
- the modular unit 200 A in this aspect, includes the heat recovery chamber 110 and first heat exchanger 116 (which may be in communication with the second heat exchanger through conduit circuit 120 ) and blower 140 .
- the modular unit 200 A may include any suitable components of the heat recovery system as described herein. Exhaust gas from the furnace and cooling gas may be provided to the heat recovery chamber 110 through cooling intake 112 and exhaust intake 114 in a manner substantially similar to that described above. In this aspect the blower 140 is provided to pull or draw gas through the heat recovery chamber 110 .
- Any suitable sensor(s) 1310 may be may be provided for sensing a pressure (or other suitable physical characteristic of the gas within the heat recovery chamber) for determining a pressure within the heat recovery chamber 110 .
- the sensor(s) 1310 may be connected to any suitable controller 1311 (which may include one or more features described above with respect to FIG. 7 ). In one aspect the controller may be integral to the modular unit 200 A while in other aspect the controller may be provided at any suitable location.
- the sensor(s) 1310 may include a pressure sensor connected to the controller 1311 to form a pressure switch for controlling a pressure within the heat recovery chamber 110 .
- the cooling intake 112 may include any suitable bypass valve 112 V for redirecting, limiting or substantially preventing discharge gas from entering the cooling intake 112 for maintaining a predetermined pressure within the heat recovery chamber 110 .
- the valve 112 V may be connected to the controller 1311 such that when a predetermined pressure within the heat recovery chamber is detected by the sensor(s) 1310 the controller operates the valve 112 V to direct at least some of the discharge gas past the cooling intake 112 for maintaining the predetermined pressure or any other suitable pressure.
- the speed of the blower 140 may be adjusted by the controller 1311 for maintaining the predetermined pressure.
- the controller may turn off the blower 140 to maintain the predetermined pressure within the heat recovery chamber.
- a check valve 1410 V may be provided in one or more of the heat recovery chamber exhaust 1410 , exhaust inlet 114 and cooling intake 112 to substantially prevent a back flow of gas into the heat recovery chamber where a pressure within the heat recovery chamber is lower than atmospheric pressure outside the heat recovery chamber.
- the sensor(s) 1310 may include a temperature sensor (similar to sensors CS 1 CS 2 described above) for sensing a temperature of the refrigerant within the first heat exchanger 116 .
- any suitable blower or fan 1320 may be provided for circulating air through the return plenum 1300 and the supply plenum 1301 .
- the blower 1320 may be connected to the controller 1311 in any suitable manner.
- the residual heat from the combustion chamber 2000 CH may be drawn from the combustion chamber in any suitable manner, such as by gas flowing through the combustion chamber and into the heat recovery chamber 110 through the exhaust intake. Any suitable blower or fan may be provided for drawing gas from the combustion chamber into the heat recovery chamber when the furnace 2000 is not operating (e.g. turned off). In other aspect the air flow may be provided through convection. In this aspect heated gas from the combustion chamber 2000 CH alone or in combination with cooling gas from the cooling intake 112 may continue to be provided to the heat recovery chamber after the furnace 2000 is turned off.
- This heated gas may continue to heat the refrigerant within the first heat exchanger 116 for transfer to the second heat exchanger where that heat is extracted from the second heat exchanger by the air flowing in the return and supply plenums 1300 , 1301 so that heated air is provided to the heating space after the furnace is turned off.
- the sensor(s) 1310 may send a signal to the controller 1311 when the temperature of, for example, the refrigerant reaches a predetermined temperature. When the predetermined temperature is reached the controller 1311 may turn off the one or more of the blowers 1320 , 140 to stop the flow of air into the heating space or adjust a speed of the blowers to decrease the flow of air.
- any residual heat from the furnace may be extracted which may increase the energy recovered by the system 100 , 200 .
- the extraction of residual heat from the furnace may be performed in the manner described above using pressure readings from within the heat recovery chamber.
- the blowers may be turned off or the speed of the blower may be varied (e.g. decreased) when the pressure within the heat recovery chamber reaches any suitable predetermined pressure.
- pressure and temperature readings may be used to control the blowers for the recovery of residual heat from tile furnace.
- the sensor(s) 1310 may be configured to detect a pressure of the refrigerant within the first heat exchanger 116 and/or a temperature of the first heat exchanger 116 for determining the presence of frost on the first heat exchanger.
- a compressor 150 may be provided to at least partly effect the flow of refrigerant through the conduit circuit 120 as described above.
- the sensor(s) 1310 may be configured to send signals to, for example, controller 1311 indicating a decrease in pressure and/or temperature within the first heat exchanger at which frost may form.
- the controller may be configured to, based on the sensor signals, turn off the compressor 150 so that the temperature and pressure of the first heat exchanger 116 rise to allow dissipation of the frost.
- the controller 1311 may be configured to use the sensor data (in e.g. in a closed loop feedback system) for setting, compressor 150 on/off times where the compressor on/off times may be adjusted by the controller in predetermined time increments.
- the heat recovery chamber 110 , 110 A, 110 C may have any suitable configuration for mixing the exhaust gas from exhaust intake 114 and the cooling gas from cooling intake 112 .
- the heat recovery chamber may have one or more features for mixing the exhaust gas and cooling gas.
- ends of the cooling intake 112 and exhaust intake 114 within the heat recovery chamber may be angled towards a wall or mixing surface 110 S (e.g. the walls may be contoured or textured) of the heat recovery chamber 110 so that the exhaust gas and cooling gas are reflected by the wall or mixing surface it any suitable manner for mixing or otherwise combining the exhaust gas with the cooling gas.
- the heat recovery chamber 110 , 11 B may include one or more vanes 1400 configured to direct the exhaust gas and cooling gas in any suitable direction(s) for mixing or otherwise combining the exhaust gas and cooling gas.
- the heat recovery chamber 110 , 110 B may include any suitable diffuser 1402 or other suitable mixing element for mixing or otherwise combining the exhaust gas and cooling gas.
- the heat recovery chamber 110 , 110 B may include one or more of the mixing surface 110 S, vanes 1400 , diffuser(s) 1402 and/or any other suitable mixing structure for mixing or otherwise combining the exhaust gas and cooling gas provided by the exhaust gas intake 114 and the cooling intake 112 .
- the heat recovery chamber 110 , 110 B may be configured so that the exhaust inlet 114 and cooling intake 112 are disposed on opposing sides or sides of the heat recovery chamber 110 , 110 B that are angled relative to one another.
- the exhaust gas intake 114 and the cooling intake 112 are disposed on opposing sides of the heat recovery chamber 110 , 110 B so that the intakes substantially face one another.
- the exhaust gas and cooling gas may be opposingly directed towards one another for mixing.
- the exhaust intake 114 and cooling intake 112 may be vertically or horizontally offset with one another or in-line with one another so that the exhaust gas and cooling gas provided to the heat recovery chamber impinge each other at any predetermined angle.
- the first heat exchanger 116 may be disposed between an outlet or exhaust 1410 of the heat recovery chamber and the inlets 114 , 112 so that the mixture of exhaust gas and cooling gas passes through the first heat exchanger 116 before entering the outlet or exhaust 1410 .
- the first heat exchanger 116 is located in a separate heat exchange chamber 110 B (e.g. such as described above with respect to FIGS. 11 and 12 ) the mixture of exhaust gas and cooling gas may exit the heat recovery chamber through outlet or exhaust 1410 for transfer to the heat exchange chamber 110 B.
- the exhaust gas intake 114 and cooling intake 112 may be disposed on angled sides of the heat recovery chamber in any suitable manner such as in a manner described with respect to FIG. 14 .
- the first heat exchanger 116 may be disposed between the outlet or exhaust 1410 of the heat recovery chamber and the inlets 114 , 112 so that the mixture of exhaust gas and cooling gas passes through the first heat exchanger 116 before entering the outlet or exhaust 1410 .
- the first heat exchanger 116 is located in a separate heat exchange chamber 110 B (e.g. such as described above with respect to FIGS. 11 and 12 ) the mixture of exhaust gas and cooling gas may exit the heat recovery chamber through outlet or exhaust 1410 for transfer to the heat exchange chamber 110 B.
- the first heat exchanger may have any suitable configuration.
- the first heat exchanger 116 may have a planar configuration while in other aspects the first heat exchanger 116 ′ (which includes one or more of heat exchange elements 116 A′, 116 B′ which are substantially similar to heat exchange elements 116 A, 116 B described above) may have cylindrical configuration.
- first the heat exchange element 116 A′ may substantially divide the heat recovery chamber into a first portion 110 P 1 and second portion 110 P 2 and where provided the heat exchanger 116 B further divides the heat recovery chamber into at least a third portion disposed between the second portion and the exhaust 1410 ).
- the exhaust gas and cooling gas is introduced into the first portion 110 P 1 and the mixture of the exhaust gas and cooling gas exits through the second portion 110 P 2 where the mixed gas passes from the first portion 110 P 1 through the first heat exchanger 116 A to the second portion 110 P 2 , and in one aspect, through the heat exchanger 116 B.
- the first heat exchanger 116 A may include coils arranged in a cylindrical arrangement so as to have an interior that forms the second portion 110 P 2 (and/or the heat exchanger 116 B has coils arranged in a cylindrical arrangement to form at least the third portion).
- the exhaust gas and cooling gas is introduced into the first portion, passes through the coils of the first heat exchanger 116 A to the interior and then, in one aspect, through the coils of the heat exchanger 116 B and exits the outlet or exhaust 1410 .
- the exhaust gas and cooling gas enters the interior of the first heat exchanger (e.g. into portion 110 P 2 ) passes through the coils of the first heat exchanger 116 A to the first portion 110 P 1 where the gas, in one aspect passes through heat exchanger 116 B, and exits through the outlet or exhaust 1410 .
- the heat exchanger 116 B is is omitted.
- the heat recovery system described herein can be employed with a boiler system 1600 to provide heated air to a heating space 1650 within a habitable structure.
- exhaust gas from boiler 1600 may be provided to heat recovery chamber 110 through exhaust gas inlet 114 .
- Cool dry gas (such as for example, indoor air and/or cooling gas from the heat recovery chamber as described above) is provided to the heat recovery chamber 110 through cooling intake 112 .
- the combined exhaust gas and cooling gas contacts the first heat exchanger 116 (which includes one or more of heat exchange elements 116 A, 116 B) and at least a portion of the exhaust gas exits outside the habitable structure through exhaust 1410 .
- Heat is transferred from the first heat exchanger 116 to the second heat exchanger 130 (which includes one or more of heat exchange elements 130 A, 130 B) through conduit 120 (and/or conduit 120 A) as described above.
- the second heat exchanger 130 is disposed within or in line with an air delivery system having a fan or blower 1621 , a supply duct 1620 and one or more air registers 1610 , 1611 through which heated supply air is introduced to the heating space 1650 .
- the second heat exchanger 130 is disposed between the supply duct 1620 and the air registers 1610 , 1611 so that air forced through the supply duct by blower 1621 passes through the second heat exchanger 130 so that heat extracted from the second heat exchanger heats the air for delivery into the heating space through the air registers 1610 , 1611 .
- the heat transferred to the second heat exchanger 130 from the first heat exchanger 116 is used to heat any suitable heat sink or heat transfer medium.
- water within a hot water tank 1700 is heated with the heat recovery system described herein.
- an air duct 1710 may be disposed adjacent a water chamber 1700 C of the hot water tank 1700 .
- the air duct 1710 is coiled around the water chamber 1700 C while in other aspects air duct(s) 1710 may be disposed within the water chamber 1700 C or have any other suitable spatial arrangement/configuration relative to the water chamber 1700 C for heating water within the water chamber 1700 in the manner described herein.
- the second heat exchanger 130 may be disposed so air passing through the air duct 1710 is forced or pulled through the second heat exchanger 130 , in any suitable manner (such as by blower 140 ) before entering the air duct 1710 .
- the second heat exchanger 130 may heat the air so that as the heated air passes through the air duct 1710 heat is transferred from the air to the water within the water chamber 1700 C in any suitable manner.
- the air may be drawn from the space in which the hot water tank 1700 is located or from any other suitable source and exhausted back into the space in which the hot water tank is located or to any other suitable location (such as outside the habitable space).
- the flow rate of the air and/or the length of the air duct 1710 may be such that substantially all of the heat stored in the air is transferred to the water within the water chamber 1700 C.
- the disclosed embodiment is directed to a method of recovering heat and energy from fuel combustion.
- the method includes feeding excess heat and exhaust gas emitted as a result of fuel combustion into a heat recovery chamber 110 which contains a first heat exchanger 116 (fluid filled) coupled with a fluid containing conduit circuit(s) 120 , 120 A.
- the fluid comprises a refrigerant.
- the method further includes feeding cooling gas into the heat recovery chamber so that the cooling gas is mixed with the exhaust gas to produce a mixed gas with potential energy.
- the method may also include effectuating heat energy exchange through the mixed gas and excess heat interacting with the first heat exchanger 116 . As a result, the temperature and pressure within the first heat exchanger 116 and fluid containing conduit circuit(s) 120 , 120 A rises.
- the method may also include releasing the heat energy by, for example, forced (or any other flow of) air blowing over a second heat exchanger 117 that is in fluid communication with one fluid containing conduit circuit(s) 120 , 120 A exterior to the heat
- a heat recovery system in a habitat to be heated by a furnace having a controller coupled to a thermostat the heat recovery system includes a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust is configured to discharge emissions from the chamber; a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled between on
- the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
- the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- the cooling intake is communicably coupled to the chamber exhaust and is configured to extract at least a portion of the emissions for recirculation as the cooling gas.
- the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
- the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
- the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
- a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
- the heat recovery system is configured to be combined with a heating furnace to effects the coupling of a PVC exhaust duct to the combination of the heat recovery assembly/system 100 and the furnace 2000 .
- a heat recovery system includes a furnace having a furnace exhaust, a return plenum and a controller coupled to a thermostat; a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake being communicably coupled to the furnace exhaust so that exhaust gas emitted as a result of fuel combustion in the furnace is transferred to the chamber, the chamber exhaust is configured to discharge emissions from the chamber, and the cooling intake is configured to effect transfer of at least a portion of the emissions from the chamber exhaust to the chamber as cooling gas; a heat recovery exchanger disposed within the chamber for contacting a mixture of the cooling gas and the exhaust gas such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit and in thermal communication with an airstream running through the return plenum for transferring heat from the heat extraction exchanger to the airstream; and a temperature sensor located in a supply plenum of the furnace and having
- the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
- the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coucoupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
- the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
- the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
- a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
- the chamber exhaust comprises a PVC duct.
- a heating furnace includes a furnace exhaust; a return plenum; a controller coupled to a thermostat; and a heat recovery system including a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake being communicably coupled to the furnace exhaust so that exhaust gas emitted as a result of fuel combustion in the furnace is transferred to the chamber, the chamber exhaust is configured to discharge emissions from the chamber, and the cooling intake is configured to effect transfer of at least a portion of the emissions from the chamber exhaust to the chamber as cooling gas; a heat recovery exchanger disposed within the chamber for contacting a mixture of the cooling gas and the exhaust gas such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit and in thermal communication with an airstream running through the return plenum for transferring heat from the heat extraction exchanger to the airstream; and a temperature sensor located in a supply plenum of the furnace
- the heating furnace further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
- the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
- the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
- the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
- a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
- a heat recovery system in a habitat to be heated by a furnace having a controller coupled to a thermostat, includes a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust is configured to discharge emissions from the chamber; a multiple stage heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected, the multiple stage heat recovery exchanger including at least a first stage and a second stage; at least one fluid circuit in communication with the heat recovery exchanger; a multiple stage heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough, the multiple stage heat extraction exchanger having at least a first stage and a second stage; and a temperature sensor located in a supply plenum of the furnace and having a pre
- the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
- the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- the cooling intake is communicably coupled to the chamber exhaust and is configured to extract at least a portion of the emissions for recirculation as the cooling gas.
- the controller is configured so that in response to a heat call from the thermostat the furnace is repeatedly cycled between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
- the chamber exhaust comprises a PVC duct.
- a heat recovery system in a habitat to be heated by a furnace having a controller coupled to a thermostat, includes a chamber including an emissions intake, a chamber exhaust and a closed loop cooling intake communicably coupling the chamber exhaust and the chamber, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace, the chamber exhaust is configured to discharge emissions from the chamber and the cooling intake is configured to recirculate at least a portion of the emissions from the chamber exhaust to the chamber; a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point
- the heat recovery system further includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
- the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
- the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
- the chamber exhaust comprises a PVC duct.
- a method for recovering heat in a habitat heated by a furnace includes providing a chamber including a cooling intake, an emissions intake and a chamber exhaust, where the emissions intake receives exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust discharges emissions from the chamber; providing a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; providing a heat extraction exchanger in fluid communication with the heat recovery exchanger through at least one fluid circuit for effecting heat exchange between the heat extraction exchanger and an airstream running therethrough; providing a temperature sensor in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; and repeatedly cycling the furnace, with a controller that, in response to a heat call from a thermostat, repeatedly cycles the furnace between on and off states for a duration of the heat call when the controller registers temperature sensor signals corresponding to the predetermined hi
- the method further includes regulating a pressure within the chamber with fan communicably coupled to the chamber exhaust where the emissions are drawn from the chamber.
- the method further includes supplying cooling gas in a closed loop from the chamber exhaust to the cooling intake.
- the heat recovery exchanger and the heat extraction exchanger are provided as a multi-stage heat exchange system including at least; a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- the method further includes effecting heat exchange during both furnace on and off states with the first stage of the multi-stage heat exchange system.
- method further includes effecting heat exchange during furnace on states with the second stage of the multi-stage heat exchange system.
- a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
- the system includes at least one controller 202 operably linked to respective operating components (e.g., and/or operating zones) of the heat recovery system.
- the operating components coupled to the at least one controller includes a compressor, a condenser, a heat exchanger, a meter, a fan, a motor, a rotor, a circuit, a pump, a valve, a conductor, a capacitor, a switch and other functional components.
- the system also includes at least one sensor 204 configured to collect at least one environmental measurement and system-related data.
- the environment measurement and the system related data includes internal and external temperature and pressure humidity, barometric pressures, dew points, wind direction, sun peak and angle, annual precipitation, geographical location and, elevation of the system, thermostats settings, chemical analysis at specific point of the system carbon dioxide level, motion level, fuel consumption, electrical consumption, fuel price, and electrical energy prices in real time.
- the system further includes a central thermal recovery unit 206 in signal communication with the at least one controller 202 and the at least one sensor 204 .
- the central thermal recovery unit 206 is configured for determining an operating instruction based on the at least one environmental measurement and system-related data received from the at least one sensor.
- the central thermal recovery unit 206 is further configured to transmit the operating instruction to the at least one controller 204 .
- the operating instruction includes a specific operation sequence of a series of operating components/zones controlled by the at least one controller.
- the central thermal recovery unit 206 can also be configured to determine operating instruction based on environment measurements and system related data retrieved from a third party database 208 .
- the third party database 208 can include information such as weather conditions, user preferred comfort level, fuel cost, air quality, and the like. The information can facilitate the central thermal recovery unit 206 to determine the operating instruction that improves efficiency and extends the life of the equipment and components of the system.
- the at least one controller 202 and/or the at least one sensor 204 can also be used to detect potential issues concerning certain mechanical part and/or zones of the system and transmit these issues to the central thermal recovery unit 206 .
- the at least one controller 202 and/or the at least one sensor 204 can detect a depleted refrigerant and/or leaks at a specific location within the system.
- the central thermal recovery unit 206 can in turn determine parts in need of repair or replacement and repair or replacement sequences.
- the central thermal recovery unit 206 can be configured to determine the operating instructions (e.g., temporal operating sequence) using an adaptive learning method. For example, the central thermal recovery unit 206 can record and analyze operation patterns, compare the efficiencies of each operation pattern, and on this basis predict the most efficient sequence under certain environmental/system conditions. The adaptive learning method will make the heat recovery system more efficient from the continuous determination and implementation of a more efficient operation pattern. The central thermal recovery unit 206 will enable a conventional HVAC system to achieve dramatically higher efficiency levels.
- the operation pattern can include motor running time, internal and external temperatures and pressures, fuel combustion rate, fan speed and durations, inducer flow level, blower pressures and speed, ignition timing, and the like. The operation patterns that result in high efficiency can then be transmitted and shared with other thermal recovery units via a network.
- the central thermal recovery unit 206 can be configured to achieve the highest system efficiency under given conditions. For example, if the price of fuel depends on the time of day, the central thermal recovery unit can account for fuel price to calculate system efficiency. As another example, for a system that can operate on certain cycles of either refrigeration or fossil fuels, if electric prices are more advantageous than natural gas at a certain time of the day, the system can favor operational cycles that use electricity over natural gas at that time of the day.
- the central thermal recovery unit 206 can also be configured to achieve a balance between high system efficiency and low thermal pollutant release. For example, for a heat recovery system located in certain valleys in certain states, for instance, Simi Valley, Calif., the release of a certain pollutant will contribute to smog accumulation. In such cases, the system can be configured to monitor the release of CO/CO2 and other system waste products and to balance energy consumption, system efficiency and materials release accordingly.
- the central thermal recovery unit 206 will first instruct a controller 202 to open one or more dampers to draft in external air for beat extraction from a heat pump. This step will allow the system to deliver a desired amount of heat without the need for a fossil fuel burn. If the first step does not achieve the thermostat setting within a defined period of time, the central thermal recovery unit 206 will instruct one or more dampers to be closed and a combustion chamber to be activated to begin generating thermal energy by burning a fuel.
- thermostat setting When the thermostat setting is achieved, information such as temperature in the return duct flow, exterior temperature, humidity, dew points, fuel consumption, run time, and the like will be measured, logged and transmitted to the central thermal recovery unit 206 and/or a data collection center. These data are then analyzed to determine, for example, the time period needed to activate a combustion chamber to achieve a desired temperature setting.
- the central thermal recovery unit 206 can compare present operating conditions with previous operating cycles under similar operating conditions and determine an operating sequence to activate and/or deactivate certain operating components of the system.
- the central thermal recovery unit 206 will determine the outdoor temperature and humidity, internal and external system condition, combustion chamber condition to determine the starting time and duration burn cycles and inducer drafting cycles to achieve maximum efficiency of the system.
- the central thermal recovery unit 206 can programmed to collect operating data and environment data of the system on a periodic basis and respond with operation instructions.
- the operating instructions can include a sequence and duration for operating a compressor, an evaporator, a condenser and a pressure device. Slight changes in the operating times and pressures of specific components will increase the efficiency of heat transfer and decrease the stress on system components. Subtle changes in the operation of each component under specific internal and external conditions can lead to significant improvements in the ability of the system to extract and transfer thermal energy.
- the central thermal recovery unit 206 can also be in signal transmission with one or more personal devices 210 , a display terminal 212 , a user interface 214 (e.g., a website), and the like, for receiving and/or displaying system operation parameters, climate conditions, and/or user preferences.
- the thermal recovery unit 206 operate at different locations and environmental conditions can continuously transmit data to and receive data from the user interface 214 (e.g., a website).
- the data input from various central thermal recovery units 206 are displayed on the user interface (e.g., a website) and updated periodically.
- the central thermal recovery units 206 installed throughout the world can become more and more efficient by learning operating parameters from other thermal recovery units.
- the central thermal recovery unit 206 is configured to communicate the personal devices 210 , the display terminal 212 and/or a user interface 214 via a network 216 using a variety of transmission paths, including wireless links such as radio frequency, satellite, Bluetooth and/or physical links such as fiber optic cable, coaxial cable, Ethernet cable, and the like.
- wireless links such as radio frequency, satellite, Bluetooth and/or physical links such as fiber optic cable, coaxial cable, Ethernet cable, and the like.
- the central thermal recovery system 206 includes a processor 218 for receiving and processing system related data such as operation parameters, sensor measurements, climate conditions, fuel information (e.g., fuel price, fuel consumption, etc.).
- the processor 218 can be also configured to output information such as operating instructions, system efficiency report, system pollutant release report, system operation history and analysis, and the like. This information can be stored in the database 220 .
- FIG. 21 illustrates a block diagram of an example heat recovery system employing a central thermal recovery unit 206 , a plurality of controllers 202 , and a plurality of sensors 204 to improve the operating efficiency of the system.
- the sensors 204 are configured to receive information such as outdoor temperature, suction temperature, plenum temperature, air quality parameters, motor operation parameters and the like.
- the plurality of controllers 202 are configured to receive operating instructions including operating one or more system components in a specific temporal sequence.
- the system components coupled to controllers 202 includes a blower, a heat coil, a compressor, a capacitor, and an inductor.
- the central thermal recovery unit 206 can also be equipped with a sound warning and/or a light warning when potential issues are detected.
- FIGS. 22-2 illustrate sample user interfaces for input system related information.
- FIGS. 24-26 illustrate sample system operating parameters and statistics.
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Abstract
Description
- This application is a continuation-in-part of U.S. patent application Ser. No. 14/029,011 filed Sep. 17, 2013 which is a continuation of U.S. patent application Ser. No. 13/753,585 filed Jan. 30, 2013, the disclosures of which applications are incorporated herein by reference in their entirety.
- The disclosed embodiment relates generally to the field of air conditioning and heating systems; more particularly, it concerns a system for efficiently combusting fossil fuels for heating a space.
- The conventional methodology used in utilizing fossil fuels for heating habitable spaces in commercial, industrial and residential buildings or structures is firing the fuel in a controlled heating chamber or heat exchanger. The heat created by the burning fuel is drawn away by air or water flowing around the outside of the heat exchanger. This can be accomplished by blower fans or pumps. The heat is transferred into the surrounding air or water, heating the conditioned space. The waste or emissions from the combustion reaction is allowed to flow outdoors usually utilizing flue piping to a chimney or stack. The efficiency of the furnace or boiler is calculated by the amount of heat which can be extracted from the heat exchanger and utilized to heat the conditioned space and the percentage of heat and by-products permitted to escape through the flue to be vented outside. This rating or efficiency quantification is placed on the furnace or boiler to depict how efficient it will be.
- Releasing carbon and heat saturated emissions into the atmosphere contribute to environmental problems, such as global warming. Not only does carbon monoxide and carbon dioxide add to blanketing the release of heat into space, discharging heat through flue gas emissions adds to this issue by heat pollution. Just an average low to medium efficient residential natural gas, LPG or oil furnace can emit about a half million BTU's of heat waste into the atmosphere each day. Commercial and industrial units can discharge hundreds of millions, and occasionally billions, of BTU's per unit per day. In addition, these common and conventional methods of discharging the flue gas into the atmosphere are wasteful and inefficient.
- The foregoing aspects and other features of the disclosed embodiment are explained in the following description, taken in connection with the accompanying drawings, wherein:
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FIG. 1 is a schematic illustration of heat recovery assembly in accordance with aspects of the disclosed embodiment. -
FIG. 1A is a schematic illustration of a portion of a heat recovery assembly in accordance with aspects of the disclosed embodiment. -
FIG. 1B is a schematic illustration of a portion of a heat recovery assembly in accordance with aspects of the disclosed embodiment. -
FIG. 1C is a schematic illustration of a portion of a heat recovery assembly in accordance with aspects of the disclosed embodiment. -
FIG. 1D is a schematic illustration of a portion of a heat recovery assembly in accordance with aspects of the disclosed embodiment. -
FIG. 2 is a schematic illustration of heat recover assembly in accordance with aspects of the disclosed embodiment. -
FIG. 3 is a schematic illustration of the functionality of aspects of the heat recovery assembly ofFIGS. 1 and 2 . -
FIG. 4 is a schematic illustration of a heat exchange process utilized in aspects of the heat recovery assembly ofFIGS. 1 and 2 . -
FIG. 5 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIG. 5A is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIG. 6 is a schematic illustration of a heat recovery system utilizing a heat recovery ventilator assembly in accordance with aspects of the disclosed embodiment. -
FIG. 7 is a schematic illustration of a wiring diagram in accordance with aspects of the heat recovery system illustrated inFIGS. 5 and 5A . -
FIG. 8A is a perspective view of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIG. 8B is a perspective view of a heat recover system in accordance with aspects of the disclosed embodiment. -
FIG. 9 a perspective view of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIG. 10 is a schematic illustration of a cut-away view in accordance aspects of be heat recovery system illustrated inFIG. 9 . -
FIG. 10A is a schematic illustrate on of away view in accordance with aspects of the heat recovery system illustrated inFIG. 9 . -
FIG. 11 is a schematic illustration of a heat recovery system in accordance with aspects the disclosed embodiment. -
FIG. 12 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIG. 13 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIGS. 14A-14F are schematic illustrations of a portion of a heat recovery system in accordance with aspects of the disclosed embodiment -
FIG. 15 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIG. 16 is a schematic illustration of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIG. 17 is a schematic illustration of a portion of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIGS. 18A-18C are a flow diagram for operation of a heat recovery system in accordance with aspects of the disclosed embodiment. -
FIG. 19 is a block diagram of a heat recovery system employing a central thermal recovery unit. -
FIG. 20 is a block diagram illustrating the central thermal recovery unit ofFIG. 19 . -
FIG. 21 is system diagram illustrating a heat recovery system employing a central thermal recovery unit. -
FIGS. 22-23 are example user interfaces for receiving system related information. -
FIGS. 24-26 are example system operating reports showing system operation parameter and analysis. - Like reference numerals refer to like parts throughout the several views of the drawings.
- As illustrated in the accompanying drawings, the aspects of the disclosed embodiment are directed to a heat and energy recovery assembly and system, in addition to methods of using the same. The heat and energy recovery assembly and system in accordance with aspects of the disclosed embodiment may be adapted for use with any suitable heating unit such as in a furnace of an HVAC system, boiler system or any other system where heat energy from fuel combustion is utilized for heating air spaces or other fluid medium. Although the aspects of the disclosed embodiment will be described with reference to the drawings, it should be understood that the aspects of the disclosed embodiment can be embodied in many forms. In addition, any suitable size, shape or type of elements or materials could be used.
- Ire one aspect of the disclosed embodiment, a heat recovery assembly/
system 100 is provided, as illustrated inFIG. 1 which when combined with aheating furnace 2000 in a heat recovery system 200 (see for exemplary purposes onlyFIGS. 5 and 5A ) delivers heat to an area or habitat to be heated such that theheat recovery assembly 100 captures and delivers heat from heated air that is circulated in the habitat, exhaust gas from thefurnace 2000 and heat stored in the thermal mass that is the furnace assembly. As may be realized, thefurnace 2000 includes acontroller 1311F that includes any suitable non-transitory program code for effecting a heating cycle of thefurnace 2000. For example, every time a thermostat, such as thermostat TSH, calls for heat, thecontroller 1311F of thefurnace 2000 detects the call for heat (e.g. receives a signal from the thermostat TSH) and starts the furnace heating cycle by first activating the furnace exhaust induction fan motor. Once thecontroller 1311F confirms proper exhaust pressure is present, the furnace igniter is turned on and verified by the control system. The furnace fuel valve FV opens, the furnace burners FBRN light and heat creation begins. As an example, on a 100,000 btuh furnace, heat is created at a rate about 28 btus per second. The motor of the furnace blower FIB cannot be turned on until the furnace heat exchanger FHX is hot enough to deliver warm air to a habitat to be heated. For a period (e.g., a latent heating period) of about 1 to about 2 minutes on most furnaces, while the heat exchanger is warming up, there is no air blowing along the outside of the furnace heat exchanger FXH. If the furnace heat exchanger FHX warm up or latent cycle is about 1 minute long, for exemplary purposes only, approximately 1500 btus of fuel is consumed and that energy is either stored in the thermal mass of the furnace heat exchanger FHX or exhausted out of thefurnace exhaust 2100. When the motor of the furnace blower FIB is finally turned on heat is transferred from the furnace heat exchanger FHX to, for example the air from the return plenum 1300 (e.g. the source heating period). When the heat call from the thermostat TSH is satisfied, the furnace burners FBRN are turned off however, according to the furnace programming the furnace blower continues to run for about 2 to about 4 minutes delivering additional heat to the house (e.g. the residual heating period). As may be realized, the about 1 to about 2 minute warm up period and the about 2 minute to about 4 minute cool down period represents about 3 to about 6 minutes (5-10% of an hour) of furnace operation at lower efficiency than the rated steady state efficiency of thefurnace 2000 so, for example, is afurnace 2000 is cycled on and off 3 to 5 times an hour (where, e.g., each cycle corresponds to a heat call from the thermostat), then about 15% to about 50% of the time thefurnace 2000 is running, the furnace is running below its rated efficiency. - The heat recovery assembly/
system 100 of the aspects of the disclosed embodiment include a multiple stage heat exchange system 120EX that is configured to recover heat lost during, for example, the warm up and cool down periods of the furnace. Further, in a conventional system the furnace is in an on state (e.g. burners FBRN lit) for 100% of the time during the heat call. The aspects of the disclosed embodiment described herein operate to discontinuously run thefurnace 2000 in short bursts during a heat call so that thefurnace 2000 is cycled on and off to achieve a higher efficiency by creating the start up and cool down furnace cycles/periods as frequently as, for example, 20 times per hour (based on, for example, a 1 hour long heat call) where, for example, during each 180 second cycle the burners FBRN are on for approximately 100 seconds and off for about 80 seconds so that heat is extracted/recovered during the start up and cool down periods, as described herein, to increase furnace efficiency and decrease fuel consumption. As will be described herein, during the furnace off times at least one stage of the multiple stage heat exchange system 120EX extracts residual heat from thefurnace 2000 to balance a heat exchange to the supply air for heating the habitat (e.g. the multiple stage heat exchange system 120EX operates as a thermal balance to maintain a temperature of the supply air above a predetermined set point for heating the habitat during periods of the heat call where thefurnace 2000 is turned off). - In one aspect, the
assembly 100 includes aheat recovery chamber 110 which comprises acooling intake 112 and an exhaust gas oremissions intake 114 for receiving exhaust gas and waste products emitted as a result of fuel combustion. It should be understood that while theheat recovery chamber 110 is illustrated in the figures as being cuboid in shape in other aspects theheat recovery chamber 110 has any suitable shape and/or configuration. For example, in other aspects, theheat recovery chamber 110 is a cylindrical drum, a pyramid or any other suitable shape. In one aspect, referring toFIG. 11 , a portion of theheat recovery chamber 110B, such as a mixingportion 110C, may be integral with, for example, theexhaust gas intake 114 or any other suitable ducting so that exhaust from afurnace 2000 or boiler and cooling gas from coolingintake 112 is at least partially mixed within the ducting prior to contacting a heat exchanger, such as a first multiple stage heat exchanger 118 (which includes one or moreheat exchange elements heat recovery chamber 110 is an insulated chamber while, in other aspects theheat recovery chamber 110 is uninsulated. Theheat recovery chamber 110 is made from any suitable material such any suitable non-metallic material, plastics, PVC, ceramics, metals or alloys. In one aspect theheat recovery chamber 110 is made of stainless steel and/or titanium alloy. - The
assembly 100 further includes a portion of the multiple stage heat exchange system 120EX such as the first multiple stage heat exchanger or absorber 116 (referred to herein as heat exchanger 116) noted above. In one aspect thefirst heat exchanger 116 is disposed within theheat recovery chamber 110 while in other aspects thefirst heat exchanger 116 is communicably coupled to theheat recovery chamber 110 in any suitable manner. For example, as described above with respect toFIG. 11 , a pre-mixing/mixingchamber 110C, in one aspect, is integrated into any suitable ducting so that the exhaust gas and cooling gas are mixed (e.g. pre-mixed) prior contacting thefirst heat exchanger 116. In this aspect, illustrated inFIG. 11 , thefirst heat exchanger 116 is disposed in aheat recovery chamber 110B that may be substantially similar toheat recovery chamber 110 however, the exhaust gas, and cooling gas may be substantially combined prior to entering theheat recovery chamber 110B. Also referring toFIG. 12 theheat recovery chamber 110 constitutes apremix chamber 110A in which cooling gas from thecooling intake 112 and exhaust from theexhaust gas intake 114 mix or otherwise combine. The mixed gas flows into theheat exchange chamber 110B in which thefirst heat exchanger 116 is disposed. Thefirst heat exchanger 116 includes one or moreheat exchange elements cooling intake 112 and exhaust gas (e.g. made up of carbon emissions) introduced via theexhaust gas intake 114. In one aspectheat exchange element 116A is larger thanheat exchange element 116B while in other aspects the one or moreheat exchange elements heat exchange elements 116A, 1116B of thefirst heat exchanger 116 to relay any problems with the functionality (such as, for example, icing or frosting) of the one or moreheat exchange elements first heat exchanger 116 to a central logic board (discussed later herein) or any other suitable controller, such as controller 1311 (FIGS. 1 and 13 ) which is connected to thefurnace controller 1311F in any suitable manner and is configured to operate the heat,recovery assembly system 100 as described herein. In one aspect, the one or moreheat exchange elements first heat exchanger 116 are made from any suitable material, such as a metallic or non-metallic material that allows for an exchange of heat. In one aspect the one or moreheat exchange elements first heat exchanger 116 are constructed of, for example metals and/or alloys, such as but not limited to, copper, aluminum and the like. In one aspect, the one or moreheat exchange elements first heat exchanger 116 is/are heat exchange coil(s) such as an evaporative coil(s) and/or use any suitable coolant or refrigerant such as a single phase coolant. - It should be understood that while the
first heat exchanger 116 is illustrated as having twoheat exchange elements FIG. 1 , in other aspects thefirst heat exchanger 116 has more (see e.g.FIG. 1A ) or less (see e.g.FIG. 10 ) than two heat exchange elements. For example, referring toFIG. 1A theheat recovery chamber 110 includes afirst heat exchanger 116 that includes fourheat exchange elements heat recovery chamber 110 pass through one of the sets ofheat exchange elements recovery chamber 110, in one aspect, includes sub-chambers 110C1, 110C2. As can be seen inFIG. 1A the furnace exhaust and cooling gas are introduced into sub-chamber 110C1, flow through sub-chamber 110C1 and into sub-chamber 110C2 where theheat exchange elements fluid circuits FIG. 1D , in one aspect the stage twofluid circuit 120A includes oneheat exchange element 116B located in sub-chamber 110C1 while the heat exchange elements of the stage onefluid circuit 120 are located in the sub-chamber 110C2. It should also be understood that the one or moreheat exchange elements heat recovery chamber 110. As may also be realized, each heat exchange element has, is part of a fluid circuit that is independently operable from other fluid circuits (e.g. each heat exchange element forms part of a separate stage of the multiple stage heat exchanger). - The
cooling intake 112 has any suitable shape and/or configuration and in one aspect structured as a single intake or in other aspects as multiple intakes. The cooling intake(s) 112 are configured to introduce one or more of indoor air or cooling gas (which is discharged from theheat recovery chamber 110 and recirculated) into theheat recovery chamber 110. In one aspect thecooling intake 112 is a closed loop extending from thechamber exhaust 118 to theheat recovery chamber 110 as described below. As will also be described below, in one aspect the cooling intake includes an active or passive orifice ORIF (which in one aspect includes avalve 112V—seeFIGS. 1A and 13 ) that is opened and closed to direct any predetermined volume of cooling gas back to therecovery chamber 110. In one aspect about 50% of the gas exiting the recovery chamber is recirculated back to therecovery chamber 110 while in other aspects any suitable volume of gas is recirculated. In one aspect of the disclosed embodiment any suitable fans or blowers are provided in any suitable manner to generate a balanced pressure environment within theheat recovery chamber 110 as described herein. In another aspect one or more of the cooling intake(s) 112 are communicably connected to a pressure regulator inducer blower (also referred to herein as a fan) 140 (see e.g.FIG. 4 ) that may be part of any suitable pressure equalization system to assist in moving the gas inside theheat recovery chamber 110 out of the heat recovery chamber where a portion of the exhaust is directed out of thechamber exhaust 118 and a portion of the exhaust is directed to thecooling intake 112. In one aspect theinducer blower 140 is located on the exhaust side of theheat recovery chamber 110 as will described below while in other aspects the inducer blower is located at any suitable location. In one aspect thefan 140 includes a variable speed motor that is controlled by any suitable sensors in communication with an interior of theheat recovery chamber 110 and configured to detect proper temperature and/or humidity and/or pressure of the gas inside theheat recovery chamber 110. - In one aspect the one or more
heat 116B of theexchange elements 116Afirst heat exchanger 116 are interconnected in any suitable manner to a respective stage of a multi-stage fluid circuit system. For example, heat exchange element is connected to stage onefluid circuit 120 and heat exchange element is connected to stage twofluid circuit 120A (e.g. each heat exchange element is interconnected with a fluid circuit that is separate and distinct (e.g. independently operable) from other fluid circuits of other heat exchange elements where each fluid circuit has itsown compressor fluid circuits heat exchange elements heat exchange elements suitable conduit respective fluid circuit assembly 100 includes a second multiple stage heat exchanger or emitter 130 (e.g. a heat extraction exchanger) including one or moreheat exchange elements heat recovery chamber 110 such that eachheat exchanger respective fluid circuit respective conduit heat exchange element 130A of thesecond heat exchanger 130 andheat exchange element 116A of thefirst heat exchanger 116 are communicably interconnected via theconduit 122 of thefluid circuit 120 such that theheat exchange element 116A of thefirst heat exchanger 116 contacts or otherwise interfaces with (e.g. within theheat recovery chamber 110 or in any other suitable manner as described herein) the mixture made up of cooling gas introduced via thecooling intake 112 and exhaust gas introduced via theexhaust gas intake 114, while theheat exchange element 130A of thesecond heat exchanger 130 contacts or otherwise interfaces in any suitable manner with air to be heated, outside of theheat recovery chamber 110. Similarly,heat exchange element 130B of thesecond heat exchanger 130 andheat exchange element 116B of thefirst heat exchanger 116 are communicably interconnected via theconduit 122A of thefluid circuit 120A such that theheat exchange element 116B of thefirst heat exchanger 116 contacts or otherwise interfaces with (e.g. within theheat recovery chamber 110 or in any other suitable manner as described herein) the mixture made up of cooling gas introduced via thecooling intake 112 and exhaust gas introduced via theexhaust gas intake 114, while theheat exchange element 130B of thesecond heat exchanger 130 contacts or otherwise interfaces in any suitable manner with air to be heated, outside of theheat recovery chamber 110. In other aspects, the heat exchange elements of the first andsecond heat exchangers heat exchange element 116A,fluid circuit 120 andheat exchange element 130A constitute the first stage of the multiple stage heat exchange system 120EX and theheat exchange element 116B,fluid circuit 120A andheat exchange element 130B constitute the second stage of the multiple stage heat exchange system 120EX. - Referring to
FIGS. 1B and 1C the one or moreheat exchange elements second heat exchanger 130 are, in one aspect, condenser coils having any suitable size(s), shapes and/or arrangement. In one aspect theheat exchange element 130A includes two heat exchange elements 130A1, 130A2 coupled together in series to form a slab condenser coil. In one aspect, the two heat exchange elements 130A1, 130A2 of theheat exchange element 130A include vertical pipes and horizontal fins. In other aspects the heat exchange element is a single heat exchange element having horizontal pipe and vertical fins or vortical pipe and horizontal fins. Theheat exchange element 130B is smaller thanheat exchange element 130A and in one aspect includes horizontal pipes and vertical fins or vertical pipes and horizontal fins. As may be realized, the pipe and fin arrangement of the one or moreheat exchange elements heat exchange element 130A intersect the pipes and fins ofheat exchange element 130B (e.g. whereheat exchange element 130A includes horizontal pipes and vertical fins the heat exchange element includes vertical pipes and horizontal fins) to facilitate a maximized heat transfer through the one or moreheat exchange elements - In one aspect the
heat recovery chamber 110 includes exhaust and drainage components. Anexhaust 118 for discharging the exhaust gas (e.g. a portion of which is recirculated as cooling gas) after heat exchange occurs is configured or otherwise structured to interconnect, for example, theheat recovery chamber 110 to the outside environment and/or tocooling intake 112 for recirculating at least a portion of the exhaust gas (e.g. the cooling gas) back into theheat recovery chamber 110 as will be described in greater detail below. The heat recovery assembly/system 100 when combined with, for example, afurnace 2000 having about an 80% efficiency produces exhaust gas temperatures (As described herein) that enable the exhaust duct (e.g. exhaust 118) to be formed of PVC rather than metal of ceramic (e.g. effects the coupling of a PVC exhaust duct to the combination of the heat recovery assembly/system 100 and the furnace 2000). In one aspect, theexhaust 118 is a single two-inch pvc vent pipe while in other aspects theexhaust 118 has any suitable size and is constructed of any suitable material such as composites, metals, etc. In one aspect adrain 111 is connected to theheat recovery chamber 110 and is configured to carry condensate water WD that may include particulates, ash and/or soot out of theheat recovery chamber 110. In one aspect for example, amister 113 is included in theheat recovery chamber 110, however in other aspects themister 113 is not provided. Themister 113 is configured to saturate the gas within theheat recovery chamber 110 with moisture and to help capture and remove particulates, ash and/or soot from the exhaust gases in any suitable manner, such as by the particulates, ash and/or soot becoming saturated with water from the flash heat steam from, for example, the super heated oil combustion exhaust gas and falling to the bottom of the chamber to be discharged through thedrain 111. In other aspects, themister 113 may not be provided such that the condensate water WD is formed from moisture in the exhaust gas and/or cooling gas introduced throughcooling intake 112 and helps capture and remove particulates, ash and/or soot from the exhaust gases. In one aspect a filter or other mechanical separation unit is provided to remove the particulates, ash and/or soot from the condensate water WD discharged through thedrain 111. Where themister 113 is provided themister 113 is, in one aspect, connected to a pressurized water tube to provide water to theheat recovery chamber 110 to raise the dew point within theheat recovery chamber 110 to raise the heat transfer potential. - The aspects of the disclosed embodiment illustrated in
FIG. 1 are designed for use when the exhaust gas input through theexhaust gas intake 114 originates from the burning of cleaner burning propane or other natural gases, such as but not limited to, a natural gas-burning furnace component of a heating, ventilation and air conditioning (HVAC) unit. However, it should be understood by those skilled in the art that theassembly 100 could be utilized in other situations where the surrounding air is to be heating by fossil fuel combustion. -
FIG. 2 illustrates an aspect of the disclosed embodiment of theassembly 100 that may be used when the exhaust gas input to theheat recovery chamber 110 through theexhaust gas intake 114 originates from an oil-burning furnace. As may be realized, this aspect of the disclosed embodiment may also be used when the exhaust gas input to theheat recovery chamber 110 through theexhaust gas intake 114 originates from burning of natural gas as well. The components and configuration of this aspect of the disclosed embodiment are generally the same as inFIG. 1 ; however, additional aspects are included for capturing the heat that is stored in the condensate water WD that may accumulate within, such as at the bottom, of theheat recovery chamber 110. While the capturing of heat stored in the condensate water WD is described with respect to theheat recovery chamber 110 inFIG. 2 it should be understood that, in other aspect, capturing heat stored in condensate water WD in theheat exchange chamber 110B (see e.g.FIGS. 11 and 12 ) is provided in a manner substantially similar to that described herein. In other aspects heat captured in the condensate water WD may be recovered from theheat recovery chamber FIG. 2 include athird heat exchanger 117 in fluid communication with one or more of thefirst heat exchanger 116 and thesecond heat exchanger 130 via asecond conduit 124 for absorbing the excess heat stored in the water as it accumulates from the condensate water WD produced within the heat recovery chamber. Since thesecond conduit 124 is in communication with one or more of thefirst heat exchanger 116 and thesecond heat exchanger 130, thethird heat exchanger 117 may be further in fluid communication with one or more of thefluid circuits drain 111 inFIG. 2 is shown, for exemplary purposes, to be structured such that condensate water WD and ash/soot within the condensate water WD does not drain from theheat recovery chamber 110 until the water rises to a certain level, WL. This allows thethird heat exchanger 117 to remain underneath the surface of the condensate water WD as it absorbs the excess heat energy stored in the condensate water WD so that very little, or none, of the heat energy remains unabsorbed in the entire process (e.g. substantially all heat energy is extracted from the condensate water WD). - During operation of the assembly and/or system of the disclosed embodiment, hot exhaust gases and combustion products (carbon monoxide, carbon dioxide, H20, etc.) are exhausted into the
heat recovery chamber 110. In one aspect, one or more of indoor air and cooling gas is introduced into theheat recovery chamber 110 in any suitable manner to mix with the hot exhaust gas. A large, cubic footprint of gas is saturated and heated as a result of the mixing. This mixture flows across one or moreheat exchange elements first heat exchanger 116 while the dew point rises, holding water and heat (saturation). The heat is extracted from the mixture via the one or moreheat exchange elements third heat exchanger 117 when provided) and transferred to a respective one of the one or moreheat exchange elements second heat exchanger 130 such that heat transfer occurs at the one or moreheat exchange elements second heat exchanger 130 to heat, for example, indoor air or any other suitable medium. Cooler, dry gas from theheat recovery chamber 110 is exported outdoors in any suitable manner, such as through any suitable chimney or exhaust flue, with a reduced heat, moisture and carbon content. In addition, as described herein, at least a portion of the cooler, dry gas from theheat recovery chamber 110 is recirculated (e.g. as cooling gas) back into theheat recovery chamber 110. This process allows heat energy to be pulled from the gas introduced into the heat recovery chamber such that it is compounded with the heat energy already being produced by the fossil fuel combustion process. This provides the assembly and system described herein in accordance with the aspects of the disclosed embodiment the potential to achieve a higher efficiency of fuel burn. - By way of example and referring to
FIG. 3 , aspects of the disclosed embodiment of the heat recovery assembly/system 100 are illustrated with respect to an exemplary 80% annual fuel utilization efficiency (AFUE) furnace rated at 100,000 input/80,000 output. Hot, moist exhaust, gases are extracted from the furnace at approximately 375° F. with approximately 90% plus humidity at approximately 55CFM. In other aspects the exhaust gases have any suitable temperature and humidity and are extracted at any suitable rate. The hot, water-saturated, exhaust gas carries a large heat potential (of e.g. at least 20,000 British Thermal Units per Hour (BTUH)). In addition to heat energy, the water-saturation of the exhaust gas (e.g. misting may increase this water-saturation where provided) includes high levels of potential energy for extraction. These exhaust gases are mixed with dry, cool gas (e.g. the cooling gas) of equal cubic feet per minute (CFM) using, for example, pressure regulation in theheat recovery chamber 110. In one aspect the cool dry gas (e.g. cooling gas) is obtained from thedischarge 118 of the heat recovery chamber 110 (as shown in, for example,FIG. 4A ) where after heat extraction at least a portion of the discharge exhaust gas is returned to theheat recovery chamber 110 under the influence of afan 140. Referring also toFIG. 4 the pressure regulation of theheat recovery assembly 100 effected by a balanced pressure system where thefan 140 is placed downstream of theheat recovery chamber 110 so as to draw or suck the gasses out of theheat recovery chamber 110. In one aspect, thefan 140 is sized so as to be substantially equal to two-times the cfm of the furnace inducer fan motor so that the discharged exhaust gas from the heat recovery chamber is split so that substantially half the discharged exhaust gas (e.g. cool dry gas or cooling gas) is returned to the heat recovery chamber to cool and be mixed with the gases from thefurnace 2000 that enter the heat recovery chamber throughgas intake 114. In other aspects, the fan 140B is sized to recover any suitable portion of the discharged exhaust gas from the heat recovery chamber for mixing with and cooling the gases from thefurnace 2000 input to theheat recovery chamber 110 throughgas intake 114. As may be realized, mixing the gases from the furnace with the cooling gas from theheat recovery chamber 110 substantially eliminates any influence of fluctuating outdoor temperatures on theheat recovery assembly 100 and substantially isolates the furnace from outdoor pressure/wind influences. As may be realized, the fan(s) 140 controlled in any suitable manner, such as bycontroller 1311 and/or by a rheostat to allow balancing of gas flow volume and velocity through theheat recovery assembly 100. - Within the
teat recovery chamber 110 under controlled conditions, in one aspect, the cooling gas, described herein, is saturated by the misted water within the exhaust gas, resulting in an increase in the dew point while in other aspects the cooling gas is not misted. The heat energy released in the exhaust gas (which may have a temperature of approximately 375° F. or any other suitable temperature) mixes with the cooling gas, resulting in a mean temperature of approximately 160° F. (or any other suitable temperature). The combined gases include oxygen (O2) assisting in the heat transfer process. The combined gases are a warm (about 160° F. or other suitable temperature), high dew point gas having, for example, a high-energy potential for high efficiency heat and energy extraction. - This combined gas mixture passes over one or more of the
heat exchange elements first heat exchanger 116. The fluid, e.g. refrigerant, in the one or moreheat exchange elements first heat exchanger 116 is under controlled pressurized conditions and is able to extract a large amount of heat energy from the combined gas mixture and transfer the heat energy to the a respective one of the one or moreheat exchange elements second heat exchanger 130 via therespective fluid circuit heat exchange elements second heat exchanger 130. The flow of refrigerant in thefluid circuit FIG. 3 . The exhaust gas discharged from the heat recovery chamber following the controlled and regulated mixing within theheat recovery chamber 110 may be dry, cool exhaust gas. For exemplary purposes, the average discharged exhaust gas from theheat recovery chamber 110 has a temperature of about 42° F. to about 49° F., a humidity of about 10%, and about a 0.05-0.00 PPM CO (carbon monoxide) content. In one aspect one or more suitable thermostat or temperature sensor TS is mounted on the furnace supply plenum or duct 1301 (and/or on the furnace return plenum 1300) and is positioned outside of any thermal influence of the heat that radiates from the thermal mass of the one or moreheat exchange elements controller 1311 in any manner so as to effect operation of theheat recovery system 100 as described herein. - Still referring to
FIG. 3 and also toFIGS. 18A-18C , an operation of the heat recovery assembly and systems described herein is described in greater detail. In one aspect thecontroller 1311 is in a monitoring state that monitors a state of thefurnace 2000 and one or more thermostats TSH that control the heating in one or more heating zones of a building or other area to be heated (FIG. 18A , Block 9000). When the one or more thermostats TSH detect a temperature that is less than a predetermined set temperature of the thermostat TSH the thermostat sends any suitable signal to thecontroller 1311. Thecontroller 1311 detects the signal and the heat call embodied in that signal (FIG. 18 , Block 9001). Thecontroller 1311 is, in one aspect, configured to determine if the heat call is a false alarm. Where the heat call is a false alarm thecontroller 1311 returns to the monitoring state (FIG. 18 , Block 9002). Where the heat call is valid thecontroller 1311 forwards the heat call to thefurnace controller 1311F to effect turning thefurnace 2000 and thefan 140 on (FIG. 18A , Block 9003). Thecontroller 1311 is also configured to determine if the heat call remains active (FIG. 18A , Block 9005). In one aspect, thecontroller 1311 waits any suitable predetermined time period before determining if the heat call remains active (FIG. 18A , Block 9004). If the heat call is no longer active thecontroller 1311 turns thefurnace 2000 off (FIG. 18A, 9006 ) by sending any suitable signal to thefurnace controller 1311F and returns to the monitoring state (FIG. 18A , Block 9007). Where the heat call remains active thecontroller 1311 turns on compressor 150 (FIG. 18A , Block 9008) andcompressor 150A (FIG. 18A , Block 9009). In one aspect, thecontroller 1311 waits any suitable predetermined amount time period between the starting ofcompressor 150 and the starting ofcompressor 150A. Thecontroller 1311 determines if the heat call remains active (FIG. 18A , Block 9010). Where the heat call is inactive thecontroller 1311 turns thefurnace 2000, thefan compressors FIG. 18A , Block 9011) and returns to the monitoring state (FIG. 18A , Block 9012). Where the heat call remains active controller proceeds to an active state (FIG. 18A , Block 9014). In one aspect the controller waits any suitable predetermined time period before proceeding to the active state (FIG. 18A , Block 9013). - In the active state the
controller 1311 monitors whether the thermostat TSH temperature is satisfied (FIG. 18B , Block 9015). Where the thermostat TSH temperature is satisfied thecontroller 1311 turns thecompressors fan 140 and the furnace off (FIG. 18B ,Blocks 9016, 9018) and returns to themonitoring state 9019. In one aspect thecontroller 1311 waits any suitable time period before turning thefan 140 off (FIG. 18B , Block 9017). If the thermostat TSH temperature is not satisfied the controller determines, from any suitable temperature sensors whether the one or more heat exchange elements, such asheat exchange elements FIG. 18B , Block 9020). - If one or more heat exchangers require defrosting the
controller 1311 determines if the call for defrosting is valid such that if the call for defrosting is not valid thecontroller 1311 returns to the active state (FIG. 18B , Block 9021). Where the call for defrosting is valid thecontroller 1311 turns the compressor(s) 150, 150A off (FIG. 18B , Block 9022), waits a predetermined amount of time suitable for defrosting (e.g. a defrost cycle) the one or moreheat exchange elements FIG. 188 , Block 9023) and returns to the monitoring state (FIG. 18B , Block 9024). If the thermostat heat call is satisfied during the defrost waiting period the defrost cycle ends and thecontroller 1311 returns to the monitoring state (FIG. 18B , Block 9025). Where there is no call for defrosting the one or moreheat exchange elements controller 1311 determines if thefurnace 2000 has failed (FIG. 18B , Block 9026). - Where the controller receives a furnace fail call from, for example, any suitable sensors connected to the furnace, the
controller 1311 determines if the furnace fall call is valid and if the furnace fail call is not valid thecontroller 1311 returns to the active state (FIG. 18B , Block 9027). If thecontroller 1311 determines that the furnace fail call is valid thecontroller 1311 turns the compressor(s) 150, 150A and thefurnace 2000 off (FIG. 18B , Block 9028) and waits a predetermined period of time (FIG. 18B , Block 9029) before turning thefan 140 off (FIG. 18B , Block 9030) and returning to the monitoring state (FIG. 18B , Block 9031). Where there is no furnace fail call the controller determines if theheat recovery assembly 100 has failed (e.g. the controller receives a heat recovery assembly fail call from any suitable sensors connected to the heat recovery assembly 100) (FIG. 18B , Block 9032). - Where the controller receives a heat recovery assembly fail call the
controller 1311 determines if the heat recovery assembly fail call is valid and if the heat recovery assembly fail call is not valid thecontroller 1311 returns to the active state (FIG. 18B , Block 9033). If thecontroller 1311 determines that the heat recovery assembly fail call is valid thecontroller 1311 turns the compressor(s) 150, 150A and thefurnace 2000 off and turns thefan 140 on (FIG. 18B , Block 9034). The controller effects any suitable aural and/or visual alert indicating a reset of theheat recovery assembly 100 is needed (FIG. 18B , Block 9035) and when theheat recovery assembly 100 is reset thecontroller 1311 returns to the monitoring state (FIG. 18B , Block 9036). If there is no heat recovery assembly fail call thecontroller 1311 enters, a heat cycle mode (FIG. 18B Block 9037). - As described above, a temperature sensor TS is mounted on or within the furnace supply plenum or
duct 1301 of thefurnace 2000. When thefurnace 2000 is burning gas (e.g. is turned on theheat recovery assembly 100 is extracting heat from the furnace exhaust gas and preheating the air in thereturn plenum 1300 so that hot air is produced at elevated temperatures compared to thefurnace 2000 running by itself. The sensor TS is monitored by the controller 1311 (FIG. 18C , Block 9038) and is set to trigger or otherwise send a signal to the controller at any suitable predetermined high temperature threshold or set point, such as about 130° F. (in other aspects the high temperature threshold is more or less than 130° F.) When thecontroller 1311 receives a signal from the temperature sensor TS that the high temperature threshold is reached the controller interrupts the thermostat TSH heat call which closes the furnace fuel valve FV and shuts off the burners FBRN (e.g. turns the furnace off however, the blower FIB remains running for a predetermined period of time per furnace programming as described herein) and turns thestage 2compressor 150A off (FIG. 18C , Block 9039). In this aspect, theheat recovery assembly 100 leverages the furnace programming (e.g. incorporates the embeddedfurnace controller 1311F that continues to run the blower FIB for a predetermined period of time, as described above, after the burners FBRN are turned off) and continues to extract and transfer heat from the residual heat from thefurnace 2000 in thechamber 110 and into the supply air stream (e.g. the blower FIB continues to operate so that air moves over/through the heat exchanger(s) 130A, 130B, FH X while the heat being transferred from theheat exchanger 116A decreases). As may be realized, the temperature sensor TS in thesupply plenum 1301 is further configured to send a signal to thecontroller 1311 indicating a predetermined low temperature threshold or set point, such as about 100° F. (in other aspects the low temperature threshold is more or less than 100° . F). Thecontroller 1311 monitors the temperatures sensor TS for a low temperature threshold signal (FIG. 18C , Block 9040) and if the low temperature threshold signal is received by thecontroller 1311, thecontroller 1311 reinstates the thermostat TSH heat call so that thefurnace 2000 and thestage 2compressor 150A are turned on (FIG. 18C , Block 9041) and the process returns to block 9038 so that the furnace is discontinuously run in short bursts so that the furnace is cycled between the on and off states during the heat call. As may be realized, the low temperature threshold is such that the low temperature threshold is reached before the blower FIB turns off so that air is continually circulating through the furnace heat exchanger FHX for delivering heat to the supply air during the heat call whether the burners FBRN are lit or off. In other aspects, thecontroller 1311 includes any suitable programming for turning the burners FBRN back on prior to the blower FIB being turned off (e.g. if the low temperature threshold is not met or for any other suitable reasons). If the low temperature threshold signal is not received thecontroller 1311 monitors the furnace blower timeout (e.g. the period of time the blower FIB operates after the burners FBRN are turned off) (FIG. 18C ,Block 9040A). If a predetermined time period prior (e.g. any suitable time period such as seconds before the expiration of the timeout, a minute before the timeout, etc.) to the timeout period expiring has not been reached (FIG. 18C ,Block 9040B) thecontroller 1311 continues to monitor for the low temperature threshold signal. If the predetermined time period prior to the timeout period expiring has been reached (FIG. 18C ,Block 9040B) thecontroller 1311 reinstates the thermostat TSH heat call so that thefurnace 2000 and thestage 2compressor 150A are turned on (FIG. 18C , Block 9041) and the process returns to block 9038 so that the furnace is discontinuously run in short bursts so that the furnace is cycled between the on and off states during the heat call. - If the thermostat TSH heat call is satisfied the
controller 1311 returns to the monitoring state and thefurnace 2000, compressor(s) 150, 150A andfan 140 are turned off (FIG. 18C , Block 9042). As may be realized, the monitoring of the temperature sensor TS in thesupply plenum 1301 effects a repeating on/off cycling of the furnace burners FBRN (e.g. the furnace is cycled between being turned on and being turned off) until the thermostat TSH heat call is satisfied which shuts thefurnace 2000 and theheat recovery assembly 100 down until the next thermostat TSH heat call. In other words, thecontroller 1311 is coupled to the temperature sensor TS having predetermined hi and low temperature set points and is configured or otherwise programmed so that in response to the heat call from the thermostat TSH the furnace is repeatedly cycled (e.g. run discontinuously or turned on and off) when thecontroller 1311 registers the temperature sensor TS signal corresponding to the hi temperature set point (e.g. the furnace is turned off) and the low temperature set point (e.g. the furnace is turned on). - The following is an exemplary table illustrating tests performed on various furnaces where the input/size is the btu rating of the furnace tested, cfm is the amount of air moved by the furnace tested, target is the targeted btus from the heat recovery assembly/system 100 to be added to the furnace heat output, the cycles per hour is the number of times the furnace tested was discontinuously run (e.g. turned on and off) over a one hour heat call, the average supply temperature (° F.) is the average temperature of the air passing through the return plenum 1300 during both furnace on and off states/periods, the average return temperature (° F.) is the average temperature of the air returning to the return plenum 1300 during both furnace on and off states/periods, the average delta temperature (° F.) is the difference between the average supply temperature and the average return temperature, the added btus are the btus recovered by the heat recovery assembly/system 100 described herein and the fuel btus is the amount of btus obtained from burning fuel during furnace on states/periods, efficiency is the fuel conversion efficiency of the furnace with the heat recovery assembly/system 100, variation is the difference between the target btus and the added btus, on second refers to the amount of firm the furnace was in the on state during each cycle of the discontinuous furnace operation, off seconds refers to the amount of time the furnace was in the off state during each cycle of the discontinuous furnace operation, therms is the amount of heat energy from fuel burned (e.g. the fuel btus), latent refers to an amount of heat (btus) of e-strained water and recovered by the heat recovery assembly/system 100 throughout the heating cycle, source is the amount of heat (btus) recovered by the heat recovery assembly/system 100 during furnace operation, and residual is the amount of heat (btus) recovered by the heat recovery assembly/system 100 during furnace cool down periods.
-
Cycles Average Average Average Input/ per supply return delta Furnace size Cfm Target hour temp temp temp 2 60000 1150 48000 13.90 120.3 64.8 55.5 1 88000 1210 70400 19.40 116.1 66.6 49.5 4 100000 1674 80000 23.50 115.4 67.1 48.3 6 120000 1513 96000 29.00 124.9 67.7 57.2 5 140000 1500 112000 23.00 140.5 71.6 68.9 -
Added Fuel On Off Furnace btus btus Efficiency Variation seconds seconds 2 72122 35900 200.9% 24122 115 150 1 67695 35180 192.4% (2705) 110 85 4 91365 62720 145.7% 11365 95 55 6 97794 64910 150.7% 1794 65 50 5 116786 73800 158.2% 4786 95 55 -
Furnace therms latent source residual 2 0.3590 2901 35900 33321 1 0.3518 2843 35180 29672 4 0.6272 5068 62720 23577 6 0.6491 5245 64910 27639 5 0.7380 5963 73800 37022 - It is noted that all values in the above table are approximate and provided for exemplary purposes only. As can be seen from the above table, the discontinuous operation (e.g. cycling between on and off states) of the furnace during a heat call decreases an amount of fuel used during the heat call while the heat recovered during the latent, source and residual heating periods by the heat recovery assembly/
system 100 increases the fuel conversion efficiency of thefurnace 2000. - During the latent, source and residual heating periods (e.g. respectively the period where the
furnace 2000 is warming the furnace heat exchanger FHX, the periods the furnace is on and the periods where thefurnace 2000 is turned off during the heat call) one or more stages of the multiple stage heat exchanger 120EX operate as described herein to increase, balance or otherwise continue heat transfer to the return air travelling through thereturn plenum 1300 for heating the supply air delivered to the habitat through thesupply plenum 1301. For example, in accordance with aspects of the disclosed embodiment, the stage onecompressor 150 runs substantially 100% of the time (e.g. when the furnace is on and when the furnace is off) the during a full thermostat heat call cycle (e.g. a duration of the heat call) so as to extract heat (e.g. residual furnace heat) from thechamber 110 and transfer heat to the supply air. In one aspect thesecondary compressor 150A only runs while the furnace is turned on (e.g. the furnace burners FBRN are lit) while in other aspects thesecondary compressor 150A also runs when the furnace burners FBRN are not lit (e.g. the furnace is turned off). In other aspects, the first and second stages of the heat exchange system are operated at any suitable times, either together or individually, during the heat call. For example, in one aspect, only stage one operates during furnace off times and only stage two operates during furnace on times or vice versa. In another aspect, stage one operates to a point where a temperature of the supply air reaches a predetermined temperature at which time stage one is turned off and stage two is turned on, or vice versa. In one aspect, thecontroller 1311 is configured to stagger a starting of the stage onecompressor 150 and the stage onecompressor 150A to, for example, avoid a combined electrical surge of thecompressors - As may be realized, the heat recovery assembly/
system 100 described herein is adapted to attach to or otherwise interface with any suitable furnace having any age or configuration. In one aspect theassembly 100 may be attached to a furnace with about 78% AFUE or higher efficiency, resulting in an increased efficiency of the system. Carbon discharge, exhaust gas temperature, and humidity may also be reduced if theassembly 100 is employed with a furnace. - Still referring to
FIGS. 1 and 3 , in one aspect a pressure sensors S5 placed the heatrecovery chamber exhaust 118 and is connected to thecontroller 1311 in any suitable manner (such as through a wired or wireless connection). The pressure sensors S2 is configured to monitor an exhaust vent pressure of thefurnace 2000 and/orheat recovery assembly 100 and send any suitable signal to the controller to turn the furnace off if the exhaust vent pressure exceeds a predetermined pressure and to turn the furnace back on if be exhaust, vent pressure falls below the predetermined pressure. Thecontroller 1311 is configured to, based on the signals from the sensor S2, to turn off thefurnace 2000 by interrupting the heat call from the thermostat TSH. In one aspect, a temperature sensor S3 is disposed in the heatrecovery chamber exhaust 118 and is connected to thecontroller 1311 for monitoring the exhaust gas exiting the heat recovery chamber. Where the sensor S3 detects the exhaust gas has a temperature above any suitable predetermined threshold temperature thecontroller 1311 is configured to, based on the sensor S3 signals, turn off thefurnace 2000 by interrupting the heat call from the the at TSH. In one aspect, a temperature sensor S1 is disposed in thefurnace exhaust 2100/intake 114 and is connected to thecontroller 1311 for monitoring a temperature of the exhaust gas entering the heat recovery chamber from the furnace 2000 (or in other words monitoring of the exhaust gas exiting the furnace 2000). Where the sensor S1 detects the exhaust gas from thefurnace 2000 passing through theintake 114 is below a predetermined temperature threshold thecontroller 1311 is configured to, based on the sensor S1 signals, turn off the compressor(s) 150, 150A to protect the compressor(s) 150, 150A and substantially prevent freezing of theheat exchange elements fluid circuit respective fluid circuit controller 1311 and suitable signals to the controller when, for example, a low temperature threshold is met so that thecontroller 1311 effects a defrosting of theheat exchange elements - Referring next to
FIG. 5 andFIG. 10 , aheat recovery system 200 is illustrated in accordance with aspects of the disclosed embodiment. Thesystem 200 may include afurnace 2000 comprising anexhaust 2100 and afurnace intake 2300. Thesystem 200 further includesheat recovery chamber 110 having acooling intake 112 and anexhaust gas intake 114. In other aspects thesystem 200 may include apremix chamber heat exchange chamber 110B as described above with respect toFIGS. 11 and 12 . Theexhaust gas intake 114 may be configured to be communicably coupled to (e.g. in communication with) theexhaust 2100 of the furnace to receive exhaust gas resulting from fuel combustion in thefurnace 2000. Afirst heat exchanger 116A may be disposed within theheat recovery chamber 110 and is in fluid communication with afluid circuit 120 that includes aconduit 122 configured to convey a fluid therein, such as a refrigerant. In other aspects thefirst heat exchanger 116, which includesheat exchange element 116A, may be communicably disposed outside the heat recovery chamber. Thefirst heat exchanger 116 may be configured such that during operation of thefurnace 2000 it is in thermal communication with a mixture comprising cooling gas introduced via thecooling intake 112 and exhaust gas introduced via theexhaust gas intake 114 that is connected to thefurnace exhaust 2100. - The
system 200 may include asecond heat exchanger 130, which includesheat exchange element 130A, in fluid communication with thefluid circuit 120 and disposed in thermal communication with an airstream being drawn into the furnace for heating (see INDOOR AIR passing through thesecond heat exchanger 130 inFIG. 5 ). Refrigerant is heated in thefirst heat exchanger 116 and moved to thesecond heat exchanger 130 via the pressure gradient created by the heat exchange and, optionally, with assistance from any suitable compressor such as the micro-compressor or the like (as described above), where heat exchange occurs between the airstream flowing from the indoor air source and thesecond heat exchanger 130. The preheated air from thesecond heat exchanger 130 is directed into theheat exchanger 2200 of the furnace such that the air is further heated and then directed into the home or other habitable structure for heating the home or other habitable structure. - The
system 200 may include adrain 111 exiting theheat recovery chamber 110. Thedrain 111 may be substantially similar to that described above and structured as, for example, inFIG. 1 orFIG. 2 , depending on the type of furnace being utilized in the system 200 (as explained previously herein). As may be realized, asystem 200 including thedrain 111 as illustrated inFIG. 2 would include athird heat exchanger 117 as previously described herein. - The
system 200 may also include anysuitable compressor 150 that may be substantially similar to that previously described herein. In one aspect the compressor may be a micro-compressor to aid in energy conservation. In another aspect a furnace inducer blower, IB, may be in connection with thefurnace exhaust 2100 to actively draw exhaust from thefurnace 2000 into theexhaust gas intake 114 of theheat recovery chamber 110. - The
assembly 100 andsystem 200 of the disclosed embodiment may further include a heat recovery ventilator. Heat recovery ventilators have been a known art in the HVAC industry for many years: however, the typical ventilator is much less efficient and structurally different than the aspects of the disclosed embodiment in combination with the assembly and system herein. A conventional Heat Recovery Ventilator (HRV) draws in fresh outdoor air to replace exhausted indoor air. The HRV helps create air exchanges within home or building structures which in turn helps to reduce pollutants, smoke, contaminants, airborne allergies, viruses, etc. from collecting within the home or building ventilation systems. During the air exchange process of a ventilator, fans and heat exchangers will pass heated or cooled indoor air over unconditioned outdoor air. The two air masses never combine but are separated by heat exchangers. This process can transfer as much as 85% of the heat energy from the conditioned air mass to the unconditioned air mass. About 15% of the energy is lost in this process, causing the home or building owner the expense of heating or air conditioning that loss to the newly introduced unconditioned air in order to maintain the same comfort level within the structure. - Referring to
FIGS. 5A and 10A aheat recovery system 200′ is illustrated in accordance with aspects of the disclosed embodiment. Theheat recovery system 200′ is substantially similar toheat recovery system 200 described above with respect toFIGS. 5 and 10 however, in this aspect the heat recovery system also includes the stage twocooling circuit 120A as described above. As such, thefirst heat exchanger 116 of theheat recovery system 200′ includesheat exchange elements heat recovery chamber 110 and thesecond heat exchanger 130 includesheat exchange elements FIG. 5A the cool, dry exhaust gas (e.g. cooling gas) introduced in the heat recovery chamber throughcooling intake 112 is, in one aspect mixed with recovery indoor air introduced into thecooling intake 112 in any suitable manner such as by any suitable fan while in other aspects, the recovery air is omitted. It is also noted that the fan orblower 140 is positioned to suck or draw the gases through theheat recovery chamber 110 while in other aspects, the fan is located in any suitable location for moving the gases through theheat recovery chamber 110. -
FIG. 6 illustrates a heat recovery ventilator (HRV)assembly 160 configured in relation to aheat recovery assembly 100 for providing fresh outdoor air to the interior environment in accordance with aspects of the disclosed embodiment. The HRV contains a ventilatoroutdoor air intake 162 that is structured to be in communication with thesecond heat exchanger 130 for heating outdoor air as it is drawn into the air intake of a heating apparatus or furnace. The HRV provides clean, outdoor air for circulation within the home or building. It directs the air into the airstream being drawn across thesecond heat exchanger 130 such that it can be heated by the energy efficient process of theheat recovery assembly 100 orsystem 200, as previously described herein. In one aspect theHRV assembly 160 may include amotorized damper 164 in communication with theoutdoor air intake 162 such that the flow of outdoor air is regulated. Athermostat 166 may be in communication with themotorized damper 164 for controlling the opening and closing of thedamper 164 based on the outdoor air temperature. In one aspect thedamper 164 may allow air temperatures ranging from about 10° F. to about 70° F. to pass therethrough. In other aspects thedamper 164 may allow air having any suitable temperature to pass therethrough. Thethermostat 166 may include atemperature sensor 168 to communicate the outside air temperature. In one aspect the inducer blower, such as fan or blower 140B is located on an outlet side (e.g. on a side of the heat exchanger where the combined cooling gas and exhaust gas exit from the heat exchanger) of theheat recovery chamber 110 so that gas is “pulled” through thefirst heat exchanger 116 while in other aspects the fan is located at any suitable location for moving gas through the heat recovery chamber. -
FIG. 7 illustrates an electrical wiring diagram of a heat and energy recovery system in accordance with aspects of the disclosed embodiment. The diagram illustrates the connections between a logic board or othersuitable controller 1311 of the system and the furnace control board and thermostat of an HVAC system. In one aspect, the logic board orcontroller 1311 may include aLCD scroll display 171 for a visual depiction of the operational parameters of the system. Heat recovery, troubleshooting, and normal operating conditions may be indicated by LED lights (see “POWER”, “TROUBLE”, “COMP1” and “COMP2”) or in any other suitable visual and/or aural manner. Various connections between sensors and switches (e.g., low and high pressure switches) are also depicted. The inducer blower or fan and micro-compressor connections and requisite relays are also depicted but may not be provided such as when the system does not include an inducer blower or compressor. Connections between one or more components of the system may be wired with thecontroller 1311 to provide centralized control and functionality of the system. -
FIGS. 8A, 8B and 9 illustrate operational aspects of the heat andenergy recovery system 200 with afurnace 2000 in accordance with the disclosed embodiment. As shown, thesystem 200 may be adapted to fit on the furnace unit either on a wall of the (FIG. 8A ) or in line with the air intake (e.g. return plenum) of the furnace (FIG. 9 ). In other aspects thesystem 200 may have any suitable positional relationship relative to thefurnace 2000. A cut-away illustration is shown inFIG. 10 where, in one aspect of the disclosed embodiment, thesystem 200 is structured to be in line with the furnace intake 2300 (which is substantially similar to return plenum 1300) for receiving air as it is drawn into thefurnace 2000. As can be seen inFIG. 8A , different configurations with respect to the placement of thereturn plenum 1300, therecovery chamber 110 and the first andsecond heat exchangers furnace 2000. - In one aspect the
heat recovery system furnace 2000 having a common housing 200HA (such as that shown inFIG. 9 ) in which at least the first andsecond heat exchangers heat recovery system first heat exchanger 116 is included in one modular 200A unit having a first housing 200HB and the second heat exchanger is included in anothermodular unit 200B having a second housing 200HC that can be placed at different locations relative to each other and/or thefurnace 2000 or boiler such as illustrated inFIG. 8A . In other aspects theheat recovery system second heat exchangers heat recovery system FIG. 8B themodular unit 200A may include thefirst heat exchanger 116, therecovery chamber 110 and any other suitable components of theheat recovery system FIGS. 7, 7A and 7B . Themodular unit 200B may include thesecond heat exchanger 130 disposed within housing 200HC. As can be seen inFIG. 8B themodular units heat recovery system 100. 200. - Referring to
FIG. 15 , in one aspect of the disclosed embodiment, at least a portion of the heat recovery system may be integrated within ahousing 2000H of thefurnace 2000. For example, in one aspect thehousing 2000H may house combustion chamber 2000CH and at least thefirst heat exchanger 116 so that thefurnace 2000 has an integral refrigerant heat exchange. In one aspect the first heat exchanger may be disposed within aheat exchange chamber 110B (e.g. substantially similar to that described with respect toFIG. 12 ) where a gas inlet is provided at least partly in thehousing 2000H for transferring combined exhaust gas and cooling gas to the first heat exchanger from theexhaust gas inlet 114 andcooling intake 112. In other aspects thefirst heat exchanger 116 may be disposed within the heat recovery chamber 110 (which is disposed within the housing 2000CH) while in other aspects theheat recovery chamber heat exchange chamber 110B (where the first heat exchanger is located within theheat exchange chamber 110B) as described above with respect toFIGS. 11 and 12 . As may be realized, theheat recovery chamber heat exchange chamber 110B may be disposed within the housing 1200CH such that theexhaust inlet 114 and cooling intake 112 (located at least partly within the housing) provide exhaust gas and cooling gas to the combining chamber. In one aspect, the housing may also house thesecond heat exchanger 130 that is communicably connected to the first heat exchanger through one or more ofconduits - Referring to
FIG. 13 a modular heat recovery system shown in accordance with the aspects of the disclosed embodiment. In this aspect thereturn plenum 1300 returns air from the heating space to the furnace to be heated. In one aspect outdoor or ventilation air may be introduced to the return air throughduct 1303 which may include a blower or fan (in other aspects a fan may not be provided) for moving the outdoor air into thereturn plenum 1300. Themodular unit 200B may be located, for example, between thefurnace 2000 and thereturn plenum 1300, within an internal passage of thereturn plenum 1300 and/or in-line with thereturn plenum 1300. As described above, heat from thesecond heat exchanger 130 may be transferred to the return air for heating or otherwise pre-heating the return air prior to heating the air with thefurnace 2000. As may be realized, the heated air may be transferred through thesupply plenum 1301 back to the heating space. In one aspect, anysuitable filter 1302 may be disposed in or in-line with thereturn plenum 1300 so that filtered air is provided for contacting thesecond heat exchanger 130. Themodular unit 200A may be located at any suitable location relative to one or more of themodular unit 200B and thefurnace 2000. Themodular unit 200A, in this aspect, includes theheat recovery chamber 110 and first heat exchanger 116 (which may be in communication with the second heat exchanger through conduit circuit 120) andblower 140. In other aspects themodular unit 200A may include any suitable components of the heat recovery system as described herein. Exhaust gas from the furnace and cooling gas may be provided to theheat recovery chamber 110 throughcooling intake 112 andexhaust intake 114 in a manner substantially similar to that described above. In this aspect theblower 140 is provided to pull or draw gas through theheat recovery chamber 110. - Any suitable sensor(s) 1310 may be may be provided for sensing a pressure (or other suitable physical characteristic of the gas within the heat recovery chamber) for determining a pressure within the
heat recovery chamber 110. The sensor(s) 1310 may be connected to any suitable controller 1311 (which may include one or more features described above with respect toFIG. 7 ). In one aspect the controller may be integral to themodular unit 200A while in other aspect the controller may be provided at any suitable location. The sensor(s) 1310 may include a pressure sensor connected to thecontroller 1311 to form a pressure switch for controlling a pressure within theheat recovery chamber 110. Thecooling intake 112 may include anysuitable bypass valve 112V for redirecting, limiting or substantially preventing discharge gas from entering thecooling intake 112 for maintaining a predetermined pressure within theheat recovery chamber 110. In one aspect thevalve 112V may be connected to thecontroller 1311 such that when a predetermined pressure within the heat recovery chamber is detected by the sensor(s) 1310 the controller operates thevalve 112V to direct at least some of the discharge gas past thecooling intake 112 for maintaining the predetermined pressure or any other suitable pressure. In other aspect the speed of theblower 140 may be adjusted by thecontroller 1311 for maintaining the predetermined pressure. In other aspects the controller may turn off theblower 140 to maintain the predetermined pressure within the heat recovery chamber. As may be realized acheck valve 1410V may be provided in one or more of the heatrecovery chamber exhaust 1410,exhaust inlet 114 andcooling intake 112 to substantially prevent a back flow of gas into the heat recovery chamber where a pressure within the heat recovery chamber is lower than atmospheric pressure outside the heat recovery chamber. - In another aspect, still referring to
FIG. 13 , the sensor(s) 1310 may include a temperature sensor (similar to sensors CS1 CS2 described above) for sensing a temperature of the refrigerant within thefirst heat exchanger 116. In this aspect any suitable blower orfan 1320 may be provided for circulating air through thereturn plenum 1300 and thesupply plenum 1301. Theblower 1320 may be connected to thecontroller 1311 in any suitable manner. As may be realized, as thefurnace 2000 is operating the exhaust from the furnace heats the refrigerant within the first andsecond heat exchangers conduit circuit 120. When thefurnace 2000 turns off there may be residual heat stored in the combustion chamber 2000CH of the furnace as well as in the refrigerant. The residual heat from the combustion chamber 2000CH may be drawn from the combustion chamber in any suitable manner, such as by gas flowing through the combustion chamber and into theheat recovery chamber 110 through the exhaust intake. Any suitable blower or fan may be provided for drawing gas from the combustion chamber into the heat recovery chamber when thefurnace 2000 is not operating (e.g. turned off). In other aspect the air flow may be provided through convection. In this aspect heated gas from the combustion chamber 2000CH alone or in combination with cooling gas from thecooling intake 112 may continue to be provided to the heat recovery chamber after thefurnace 2000 is turned off. This heated gas may continue to heat the refrigerant within thefirst heat exchanger 116 for transfer to the second heat exchanger where that heat is extracted from the second heat exchanger by the air flowing in the return andsupply plenums controller 1311 when the temperature of, for example, the refrigerant reaches a predetermined temperature. When the predetermined temperature is reached thecontroller 1311 may turn off the one or more of theblowers system - In other aspects the sensor(s) 1310 may be configured to detect a pressure of the refrigerant within the
first heat exchanger 116 and/or a temperature of thefirst heat exchanger 116 for determining the presence of frost on the first heat exchanger. For example, acompressor 150 may be provided to at least partly effect the flow of refrigerant through theconduit circuit 120 as described above. The sensor(s) 1310 may be configured to send signals to, for example,controller 1311 indicating a decrease in pressure and/or temperature within the first heat exchanger at which frost may form. The controller may be configured to, based on the sensor signals, turn off thecompressor 150 so that the temperature and pressure of thefirst heat exchanger 116 rise to allow dissipation of the frost. Thecontroller 1311 may be configured to use the sensor data (in e.g. in a closed loop feedback system) for setting,compressor 150 on/off times where the compressor on/off times may be adjusted by the controller in predetermined time increments. - Referring now to
FIG. 14A , in the aspects of the disclosed embodiment described herein theheat recovery chamber exhaust intake 114 and the cooling gas from coolingintake 112. In one aspect the heat recovery chamber may have one or more features for mixing the exhaust gas and cooling gas. For example, ends of thecooling intake 112 andexhaust intake 114 within the heat recovery chamber may be angled towards a wall or mixingsurface 110S (e.g. the walls may be contoured or textured) of theheat recovery chamber 110 so that the exhaust gas and cooling gas are reflected by the wall or mixing surface it any suitable manner for mixing or otherwise combining the exhaust gas with the cooling gas. In another aspect theheat recovery chamber 110, 11B may include one ormore vanes 1400 configured to direct the exhaust gas and cooling gas in any suitable direction(s) for mixing or otherwise combining the exhaust gas and cooling gas. In yet another aspect theheat recovery chamber suitable diffuser 1402 or other suitable mixing element for mixing or otherwise combining the exhaust gas and cooling gas. In still other aspects, theheat recovery chamber surface 110S,vanes 1400, diffuser(s) 1402 and/or any other suitable mixing structure for mixing or otherwise combining the exhaust gas and cooling gas provided by theexhaust gas intake 114 and thecooling intake 112. - Referring to
FIG. 14B andFIG. 14C theheat recovery chamber exhaust inlet 114 andcooling intake 112 are disposed on opposing sides or sides of theheat recovery chamber FIG. 14B theexhaust gas intake 114 and thecooling intake 112 are disposed on opposing sides of theheat recovery chamber exhaust intake 114 andcooling intake 112 may be vertically or horizontally offset with one another or in-line with one another so that the exhaust gas and cooling gas provided to the heat recovery chamber impinge each other at any predetermined angle. As may also be realized, in one aspect, where thefirst heat exchanger 116 is located within theheat recovery chamber 110, the first heat exchanger may be disposed between an outlet orexhaust 1410 of the heat recovery chamber and theinlets first heat exchanger 116 before entering the outlet orexhaust 1410. In another aspect, where thefirst heat exchanger 116 is located in a separateheat exchange chamber 110B (e.g. such as described above with respect toFIGS. 11 and 12 ) the mixture of exhaust gas and cooling gas may exit the heat recovery chamber through outlet orexhaust 1410 for transfer to theheat exchange chamber 110B. - As can be seen in
FIG. 14C and 14D , theexhaust gas intake 114 andcooling intake 112 may be disposed on angled sides of the heat recovery chamber in any suitable manner such as in a manner described with respect toFIG. 14 . As may be realized, where thefirst heat exchanger 116 is located within theheat recovery chamber 110, the first heat exchanger may be disposed between the outlet orexhaust 1410 of the heat recovery chamber and theinlets first heat exchanger 116 before entering the outlet orexhaust 1410. In another aspect, where thefirst heat exchanger 116 is located in a separateheat exchange chamber 110B (e.g. such as described above with respect toFIGS. 11 and 12 ) the mixture of exhaust gas and cooling gas may exit the heat recovery chamber through outlet orexhaust 1410 for transfer to theheat exchange chamber 110B. - Referring to
FIG. 14E , in accordance with an aspect of the disclosed embodiment the first heat exchanger may have any suitable configuration. In one aspect thefirst heat exchanger 116 may have a planar configuration while in other aspects thefirst heat exchanger 116′ (which includes one or more ofheat exchange elements 116A′, 116B′ which are substantially similar to heatexchange elements heat exchange element 116A′ may substantially divide the heat recovery chamber into a first portion 110P1 and second portion 110P2 and where provided theheat exchanger 116B further divides the heat recovery chamber into at least a third portion disposed between the second portion and the exhaust 1410). The exhaust gas and cooling gas is introduced into the first portion 110P1 and the mixture of the exhaust gas and cooling gas exits through the second portion 110P2 where the mixed gas passes from the first portion 110P1 through thefirst heat exchanger 116A to the second portion 110P2, and in one aspect, through theheat exchanger 116B. In this example thefirst heat exchanger 116A may include coils arranged in a cylindrical arrangement so as to have an interior that forms the second portion 110P2 (and/or theheat exchanger 116B has coils arranged in a cylindrical arrangement to form at least the third portion). The exhaust gas and cooling gas is introduced into the first portion, passes through the coils of thefirst heat exchanger 116A to the interior and then, in one aspect, through the coils of theheat exchanger 116B and exits the outlet orexhaust 1410. In another aspect, as shown inFIG. 14F , the exhaust gas and cooling gas enters the interior of the first heat exchanger (e.g. into portion 110P2) passes through the coils of thefirst heat exchanger 116A to the first portion 110P1 where the gas, in one aspect passes throughheat exchanger 116B, and exits through the outlet orexhaust 1410. In other aspects theheat exchanger 116B is is omitted. - Referring to
FIG. 16 the heat recovery system described herein can be employed with aboiler system 1600 to provide heated air to aheating space 1650 within a habitable structure. For example, exhaust gas fromboiler 1600 may be provided to heatrecovery chamber 110 throughexhaust gas inlet 114. Cool dry gas (such as for example, indoor air and/or cooling gas from the heat recovery chamber as described above) is provided to theheat recovery chamber 110 throughcooling intake 112. The combined exhaust gas and cooling gas contacts the first heat exchanger 116 (which includes one or more ofheat exchange elements exhaust 1410. Heat is transferred from thefirst heat exchanger 116 to the second heat exchanger 130 (which includes one or more ofheat exchange elements conduit 120A) as described above. Thesecond heat exchanger 130 is disposed within or in line with an air delivery system having a fan orblower 1621, asupply duct 1620 and one ormore air registers heating space 1650. In this aspect thesecond heat exchanger 130 is disposed between thesupply duct 1620 and the air registers 1610, 1611 so that air forced through the supply duct byblower 1621 passes through thesecond heat exchanger 130 so that heat extracted from the second heat exchanger heats the air for delivery into the heating space through the air registers 1610, 1611. - As may be realized, in one aspect, the heat transferred to the
second heat exchanger 130 from the first heat exchanger 116 (whether the system is employed with a furnace or boiler) is used to heat any suitable heat sink or heat transfer medium. Referring toFIG. 17 in one aspect water within ahot water tank 1700 is heated with the heat recovery system described herein. For example, anair duct 1710 may be disposed adjacent a water chamber 1700C of thehot water tank 1700. In this aspect theair duct 1710 is coiled around the water chamber 1700C while in other aspects air duct(s) 1710 may be disposed within the water chamber 1700C or have any other suitable spatial arrangement/configuration relative to the water chamber 1700C for heating water within thewater chamber 1700 in the manner described herein. In one aspect thesecond heat exchanger 130 may be disposed so air passing through theair duct 1710 is forced or pulled through thesecond heat exchanger 130, in any suitable manner (such as by blower 140) before entering theair duct 1710. Thesecond heat exchanger 130 may heat the air so that as the heated air passes through theair duct 1710 heat is transferred from the air to the water within the water chamber 1700C in any suitable manner. The air may be drawn from the space in which thehot water tank 1700 is located or from any other suitable source and exhausted back into the space in which the hot water tank is located or to any other suitable location (such as outside the habitable space). As may be realized the flow rate of the air and/or the length of theair duct 1710 may be such that substantially all of the heat stored in the air is transferred to the water within the water chamber 1700C. - In one aspect the disclosed embodiment is directed to a method of recovering heat and energy from fuel combustion. The method includes feeding excess heat and exhaust gas emitted as a result of fuel combustion into a
heat recovery chamber 110 which contains a first heat exchanger 116 (fluid filled) coupled with a fluid containing conduit circuit(s) 120, 120A. Typically, the fluid comprises a refrigerant. The method further includes feeding cooling gas into the heat recovery chamber so that the cooling gas is mixed with the exhaust gas to produce a mixed gas with potential energy. The method may also include effectuating heat energy exchange through the mixed gas and excess heat interacting with thefirst heat exchanger 116. As a result, the temperature and pressure within thefirst heat exchanger 116 and fluid containing conduit circuit(s) 120, 120A rises. The method may also include releasing the heat energy by, for example, forced (or any other flow of) air blowing over asecond heat exchanger 117 that is in fluid communication with one fluid containing conduit circuit(s) 120, 120A exterior to the heat recovery chamber. - In accordance with one or more aspects of the disclosed embodiment a heat recovery system in a habitat to be heated by a furnace having a controller coupled to a thermostat, the heat recovery system includes a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust is configured to discharge emissions from the chamber; a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
- It accordance with one or more aspects of the disclosed embodiment the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
- In accordance with one or more aspects of the disclosed embodiment the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- In accordance with one or more aspects of the disclosed embodiment the cooling intake is communicably coupled to the chamber exhaust and is configured to extract at least a portion of the emissions for recirculation as the cooling gas.
- In accordance with one or more aspects of the disclosed embodiment the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- In accordance with one or more aspects of the disclosed embodiment each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
- In accordance with one or more aspects of the disclosed embodiment the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
- In accordance with one or more aspects of the disclosed embodiment the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
- In accordance with one or more aspects of the disclosed embodiment a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
- In accordance with one or more aspects of the disclosed embodiment, the heat recovery system is configured to be combined with a heating furnace to effects the coupling of a PVC exhaust duct to the combination of the heat recovery assembly/
system 100 and thefurnace 2000. - In accordance with one or more aspects of the disclosed embodiment a heat recovery system includes a furnace having a furnace exhaust, a return plenum and a controller coupled to a thermostat; a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake being communicably coupled to the furnace exhaust so that exhaust gas emitted as a result of fuel combustion in the furnace is transferred to the chamber, the chamber exhaust is configured to discharge emissions from the chamber, and the cooling intake is configured to effect transfer of at least a portion of the emissions from the chamber exhaust to the chamber as cooling gas; a heat recovery exchanger disposed within the chamber for contacting a mixture of the cooling gas and the exhaust gas such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit and in thermal communication with an airstream running through the return plenum for transferring heat from the heat extraction exchanger to the airstream; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled between on and off states throughout the heat call when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
- In accordance with one or more aspects of the disclosed embodiment the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
- In accordance with one or more aspects of the disclosed embodiment the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- In accordance with one or more aspects, of the disclosed embedment the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coucoupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- In accordance with one or more aspects of the disclosed embodiment each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
- In accordance with one or more aspects of the disclosed embodiment the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
- In accordance with one or more aspects of the disclosed embodiment the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
- In accordance with one or more aspects of the disclosed embodiment a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
- In accordance with one or more aspects of the disclosed embodiment the chamber exhaust comprises a PVC duct.
- In accordance with one or more aspects of the disclosed embodiment a heating furnace includes a furnace exhaust; a return plenum; a controller coupled to a thermostat; and a heat recovery system including a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake being communicably coupled to the furnace exhaust so that exhaust gas emitted as a result of fuel combustion in the furnace is transferred to the chamber, the chamber exhaust is configured to discharge emissions from the chamber, and the cooling intake is configured to effect transfer of at least a portion of the emissions from the chamber exhaust to the chamber as cooling gas; a heat recovery exchanger disposed within the chamber for contacting a mixture of the cooling gas and the exhaust gas such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit and in thermal communication with an airstream running through the return plenum for transferring heat from the heat extraction exchanger to the airstream; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled, for a duration of the heat call, between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
- In accordance with one or more aspects of the disclosed embodiment the heating furnace further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
- In accordance with one or more aspects of the disclosed embodiment the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- In accordance with one or more aspects of the disclosed embodiment the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- In accordance with one or more aspects of the disclosed embodiment each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
- In accordance with one or more aspects of the disclosed embodiment the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
- In accordance with one or more aspects of the disclosed embodiment the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
- In accordance with one or more aspects of the disclosed embodiment a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
- In accordance with one or more aspects of the disclosed embodiment a heat recovery system, in a habitat to be heated by a furnace having a controller coupled to a thermostat, includes a chamber including a cooling intake, an emissions intake and a chamber exhaust, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust is configured to discharge emissions from the chamber; a multiple stage heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected, the multiple stage heat recovery exchanger including at least a first stage and a second stage; at least one fluid circuit in communication with the heat recovery exchanger; a multiple stage heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough, the multiple stage heat extraction exchanger having at least a first stage and a second stage; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, one or more of the first and second stages of the multiple stage heat recovery exchanger and the multiple stage heat extraction exchanger are operative during the furnace on state, the first stages of the multiple stage heat recovery exchanger and the multiple stage heat extraction exchanger are operative during the furnace on state, and the second stages of the multiple stage heat recovery exchanger and the multiple stage heat extraction exchanger are inoperative during the furnace off state.
- In accordance with one or more aspects of the disclosed embodiment the heat recovery system further includes a pressure regulating assembly in communication with the chamber and the chamber exhaust for regulating a pressure in the heat recovery system.
- In accordance with one or more aspects of the disclosed embodiment the pressure regulating assembly includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- In accordance with one or more aspects of the disclosed embodiment the cooling intake is communicably coupled to the chamber exhaust and is configured to extract at least a portion of the emissions for recirculation as the cooling gas.
- In accordance with one or more aspects of the disclosed embodiment the controller is configured so that in response to a heat call from the thermostat the furnace is repeatedly cycled between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
- In accordance with one or more aspects of the disclosed embodiment the chamber exhaust comprises a PVC duct.
- In accordance with one or more aspects of the disclosed embodiment a heat recovery system, in a habitat to be heated by a furnace having a controller coupled to a thermostat, includes a chamber including an emissions intake, a chamber exhaust and a closed loop cooling intake communicably coupling the chamber exhaust and the chamber, the emissions intake is configured for receiving exhaust gas emitted as a result of fuel combustion in the furnace, the chamber exhaust is configured to discharge emissions from the chamber and the cooling intake is configured to recirculate at least a portion of the emissions from the chamber exhaust to the chamber; a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; at least one fluid circuit in communication with the heat recovery exchanger; a heat extraction exchanger in fluid communication with the heat recovery exchanger through the at least one fluid circuit to effect heat exchange between the heat extraction exchanger and an airstream running therethrough; and a temperature sensor located in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; where the controller is configured so that in response to a heat call from the thermostat, the furnace is repeatedly cycled between on and off states when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
- In accordance with one or more aspects of the disclosed embodiment the heat recovery system further includes a fan communicably coupled to the chamber exhaust and configured to draw the emissions from the chamber.
- In accordance with one or more aspects of the disclosed embodiment the heat recovery exchanger and the heat extraction exchanger comprise a multi-stage heat exchange system including at least: a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- In accordance with one or more aspects of the disclosed embodiment each stage of the multi-stage heat exchange system is independently operable from another stage of the multi-stage heat exchange system.
- In accordance with one or more aspects of the disclosed embodiment the first stage of the multi-stage heat exchange system effects heat exchange during both furnace on and off states.
- In accordance with one or more aspects of the disclosed embodiment the second stage of the multi-stage heat exchange system is operative and effects heat exchange during furnace on states and inoperative during furnace off states.
- In accordance with one more aspects of the disclosed embodiment the chamber exhaust comprises a PVC duct.
- In accordance with one or more aspects of the disclosed embodiment a method for recovering heat in a habitat heated by a furnace includes providing a chamber including a cooling intake, an emissions intake and a chamber exhaust, where the emissions intake receives exhaust gas emitted as a result of fuel combustion in the furnace and the chamber exhaust discharges emissions from the chamber; providing a heat recovery exchanger disposed within the chamber for contacting a mixture of cooling gas introduced through the cooling intake and the exhaust gas introduced through the emissions intake such that heat exchange is effected; providing a heat extraction exchanger in fluid communication with the heat recovery exchanger through at least one fluid circuit for effecting heat exchange between the heat extraction exchanger and an airstream running therethrough; providing a temperature sensor in a supply plenum of the furnace and having a predetermined hi temperature set point and a predetermined low temperature set point; and repeatedly cycling the furnace, with a controller that, in response to a heat call from a thermostat, repeatedly cycles the furnace between on and off states for a duration of the heat call when the controller registers temperature sensor signals corresponding to the predetermined hi temperature set point and the predetermined low temperature set point.
- In accordance with one or more aspects of the disclosed embodiment the method further includes regulating a pressure within the chamber with fan communicably coupled to the chamber exhaust where the emissions are drawn from the chamber.
- In accordance with one or more aspects the disclosed embodiment the method further includes supplying cooling gas in a closed loop from the chamber exhaust to the cooling intake.
- In accordance with one or more aspects of the disclosed embodiment the heat recovery exchanger and the heat extraction exchanger are provided as a multi-stage heat exchange system including at least; a first stage having a primary heat recovery exchanger element and a primary heat extraction exchanger element communicably coupled to each other through a primary fluid circuit of the at least one fluid circuit; and a second stage having a secondary heat recovery exchanger element and a secondary heat extraction exchanger element communicably coupled to each other through a secondary fluid circuit of the at least one fluid circuit.
- In accordance with one or more aspects off the disclosed embodiment the method further includes effecting heat exchange during both furnace on and off states with the first stage of the multi-stage heat exchange system.
- In accordance with one or more aspects of the disclosed embodiment method further includes effecting heat exchange during furnace on states with the second stage of the multi-stage heat exchange system.
- In accordance with one or more aspects of the disclosed embodiment a burner of the furnace is switched on and off corresponding to a furnace on and off cycle and a return air blower of the furnace continues to run during the heat call.
- Referring to
FIG. 19 , ire accordance with one or more aspects of the disclosed embodiment, the system includes at least onecontroller 202 operably linked to respective operating components (e.g., and/or operating zones) of the heat recovery system. For example, the operating components coupled to the at least one controller includes a compressor, a condenser, a heat exchanger, a meter, a fan, a motor, a rotor, a circuit, a pump, a valve, a conductor, a capacitor, a switch and other functional components. - The system also includes at least one
sensor 204 configured to collect at least one environmental measurement and system-related data. The environment measurement and the system related data includes internal and external temperature and pressure humidity, barometric pressures, dew points, wind direction, sun peak and angle, annual precipitation, geographical location and, elevation of the system, thermostats settings, chemical analysis at specific point of the system carbon dioxide level, motion level, fuel consumption, electrical consumption, fuel price, and electrical energy prices in real time. - The system further includes a central
thermal recovery unit 206 in signal communication with the at least onecontroller 202 and the at least onesensor 204. The centralthermal recovery unit 206 is configured for determining an operating instruction based on the at least one environmental measurement and system-related data received from the at least one sensor. The centralthermal recovery unit 206 is further configured to transmit the operating instruction to the at least onecontroller 204. The operating instruction includes a specific operation sequence of a series of operating components/zones controlled by the at least one controller. - The central
thermal recovery unit 206 can also be configured to determine operating instruction based on environment measurements and system related data retrieved from athird party database 208. For example, thethird party database 208 can include information such as weather conditions, user preferred comfort level, fuel cost, air quality, and the like. The information can facilitate the centralthermal recovery unit 206 to determine the operating instruction that improves efficiency and extends the life of the equipment and components of the system. - The at least one
controller 202 and/or the at least onesensor 204 can also be used to detect potential issues concerning certain mechanical part and/or zones of the system and transmit these issues to the centralthermal recovery unit 206. For example, the at least onecontroller 202 and/or the at least onesensor 204 can detect a depleted refrigerant and/or leaks at a specific location within the system. The centralthermal recovery unit 206 can in turn determine parts in need of repair or replacement and repair or replacement sequences. - The central
thermal recovery unit 206 can be configured to determine the operating instructions (e.g., temporal operating sequence) using an adaptive learning method. For example, the centralthermal recovery unit 206 can record and analyze operation patterns, compare the efficiencies of each operation pattern, and on this basis predict the most efficient sequence under certain environmental/system conditions. The adaptive learning method will make the heat recovery system more efficient from the continuous determination and implementation of a more efficient operation pattern. The centralthermal recovery unit 206 will enable a conventional HVAC system to achieve dramatically higher efficiency levels. As an example, the operation pattern can include motor running time, internal and external temperatures and pressures, fuel combustion rate, fan speed and durations, inducer flow level, blower pressures and speed, ignition timing, and the like. The operation patterns that result in high efficiency can then be transmitted and shared with other thermal recovery units via a network. - The central
thermal recovery unit 206 can be configured to achieve the highest system efficiency under given conditions. For example, if the price of fuel depends on the time of day, the central thermal recovery unit can account for fuel price to calculate system efficiency. As another example, for a system that can operate on certain cycles of either refrigeration or fossil fuels, if electric prices are more advantageous than natural gas at a certain time of the day, the system can favor operational cycles that use electricity over natural gas at that time of the day. - The central
thermal recovery unit 206 can also be configured to achieve a balance between high system efficiency and low thermal pollutant release. For example, for a heat recovery system located in certain valleys in certain states, for instance, Simi Valley, Calif., the release of a certain pollutant will contribute to smog accumulation. In such cases, the system can be configured to monitor the release of CO/CO2 and other system waste products and to balance energy consumption, system efficiency and materials release accordingly. - As an example, given an outdoor temperature of 40° F., when a call for heat from a thermostat is received, the central
thermal recovery unit 206 will first instruct acontroller 202 to open one or more dampers to draft in external air for beat extraction from a heat pump. This step will allow the system to deliver a desired amount of heat without the need for a fossil fuel burn. If the first step does not achieve the thermostat setting within a defined period of time, the centralthermal recovery unit 206 will instruct one or more dampers to be closed and a combustion chamber to be activated to begin generating thermal energy by burning a fuel. When the thermostat setting is achieved, information such as temperature in the return duct flow, exterior temperature, humidity, dew points, fuel consumption, run time, and the like will be measured, logged and transmitted to the centralthermal recovery unit 206 and/or a data collection center. These data are then analyzed to determine, for example, the time period needed to activate a combustion chamber to achieve a desired temperature setting. The centralthermal recovery unit 206 can compare present operating conditions with previous operating cycles under similar operating conditions and determine an operating sequence to activate and/or deactivate certain operating components of the system. - As another example, when a call for heat from a thermostat received, the central
thermal recovery unit 206 will determine the outdoor temperature and humidity, internal and external system condition, combustion chamber condition to determine the starting time and duration burn cycles and inducer drafting cycles to achieve maximum efficiency of the system. - As another example, for a refrigeration system, the central
thermal recovery unit 206 can programmed to collect operating data and environment data of the system on a periodic basis and respond with operation instructions. The operating instructions can include a sequence and duration for operating a compressor, an evaporator, a condenser and a pressure device. Slight changes in the operating times and pressures of specific components will increase the efficiency of heat transfer and decrease the stress on system components. Subtle changes in the operation of each component under specific internal and external conditions can lead to significant improvements in the ability of the system to extract and transfer thermal energy. - The central
thermal recovery unit 206 can also be in signal transmission with one or more personal devices 210, adisplay terminal 212, a user interface 214 (e.g., a website), and the like, for receiving and/or displaying system operation parameters, climate conditions, and/or user preferences. Thethermal recovery unit 206 operate at different locations and environmental conditions can continuously transmit data to and receive data from the user interface 214 (e.g., a website). The data input from various centralthermal recovery units 206 are displayed on the user interface (e.g., a website) and updated periodically. As a result, the centralthermal recovery units 206 installed throughout the world can become more and more efficient by learning operating parameters from other thermal recovery units. - The central
thermal recovery unit 206 is configured to communicate the personal devices 210, thedisplay terminal 212 and/or auser interface 214 via anetwork 216 using a variety of transmission paths, including wireless links such as radio frequency, satellite, Bluetooth and/or physical links such as fiber optic cable, coaxial cable, Ethernet cable, and the like. - Referring to
FIG. 20 , the centralthermal recovery system 206 includes aprocessor 218 for receiving and processing system related data such as operation parameters, sensor measurements, climate conditions, fuel information (e.g., fuel price, fuel consumption, etc.). Theprocessor 218 can be also configured to output information such as operating instructions, system efficiency report, system pollutant release report, system operation history and analysis, and the like. This information can be stored in thedatabase 220. -
FIG. 21 illustrates a block diagram of an example heat recovery system employing a centralthermal recovery unit 206, a plurality ofcontrollers 202, and a plurality ofsensors 204 to improve the operating efficiency of the system. Thesensors 204 are configured to receive information such as outdoor temperature, suction temperature, plenum temperature, air quality parameters, motor operation parameters and the like. The plurality ofcontrollers 202 are configured to receive operating instructions including operating one or more system components in a specific temporal sequence. In the depicted embodiment, the system components coupled tocontrollers 202 includes a blower, a heat coil, a compressor, a capacitor, and an inductor. The centralthermal recovery unit 206 can also be equipped with a sound warning and/or a light warning when potential issues are detected. -
FIGS. 22-2 illustrate sample user interfaces for input system related information. -
FIGS. 24-26 illustrate sample system operating parameters and statistics. - It should be understood that the foregoing description is only illustrative of the aspects of the disclosed embodiment. Various alternatives and modifications can be devised by those skilled in the art without departing from the aspects of the disclosed embodiment. Accordingly, the aspects of the disclosed embodiment are intended to embrace all such alternatives, modifications and variances that fall within the scope of the appended claims. Further, the mere fact that different features are recited in mutually different dependent or independent claims does not indicate that a combination of these features cannot be advantageously used, such a combination remaining within the scope of the aspects of the invention.
Claims (20)
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US15/417,509 US20170138612A1 (en) | 2013-01-30 | 2017-01-27 | Heat and energy recovery and regeneration assembly, system and method |
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US13/753,585 US9810455B2 (en) | 2013-01-30 | 2013-01-30 | Heat and energy recovery and regeneration assembly, system and method |
US14/029,011 US20140209697A1 (en) | 2013-01-30 | 2013-09-17 | Heat and energy recovery and regeneration assembly, system and method |
US15/417,509 US20170138612A1 (en) | 2013-01-30 | 2017-01-27 | Heat and energy recovery and regeneration assembly, system and method |
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US14/029,011 Continuation-In-Part US20140209697A1 (en) | 2013-01-30 | 2013-09-17 | Heat and energy recovery and regeneration assembly, system and method |
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US15/417,509 Abandoned US20170138612A1 (en) | 2013-01-30 | 2017-01-27 | Heat and energy recovery and regeneration assembly, system and method |
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