CN113932330A - Integrated fresh air dehumidifier with precooling water tray and control method thereof - Google Patents
Integrated fresh air dehumidifier with precooling water tray and control method thereof Download PDFInfo
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- CN113932330A CN113932330A CN202111232326.3A CN202111232326A CN113932330A CN 113932330 A CN113932330 A CN 113932330A CN 202111232326 A CN202111232326 A CN 202111232326A CN 113932330 A CN113932330 A CN 113932330A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F3/147—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with both heat and humidity transfer between supplied and exhausted air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F2003/144—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification by dehumidification only
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- 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]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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- General Engineering & Computer Science (AREA)
- Central Air Conditioning (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to an integral fresh air dehumidifier with a precooling water tray and a control method thereof, wherein the dehumidifier comprises an air flow path, a refrigerant loop and a water flow path, the air flow path comprises an air supply duct and an air exhaust duct, and an air mixing air port capable of communicating the air supply duct and the air exhaust duct is arranged between the air supply duct and the air exhaust duct; the refrigerant loop comprises a compressor, a four-way reversing valve, an exhaust coil, a first one-way valve, an air supply coil, a throttling device and an air inlet coil which are connected in sequence; the air supply system is characterized in that a water coil is arranged in front of an air inlet coil of the air supply duct, outdoor air inlet is subjected to preliminary cooling and dehumidification through the water coil in a dehumidification mode, and fresh air is heated through the water coil in a heating mode. Compared with the prior art, the invention utilizes the water coil pipe to carry out precooling and dehumidification on the fresh air, thus helping to reduce load and improve energy efficiency (or primarily heat the fresh air in a heating mode); meanwhile, the refrigeration cycle flow path is complete and self-sufficient, so that the refrigeration cycle flow path can be operated independently without depending on an external cold/hot water source.
Description
Technical Field
The invention relates to a fresh air dehumidifier and a control method thereof, in particular to an integral fresh air dehumidifier with a precooling water tray and a control method thereof.
Background
The heat pump type exhaust air heat recovery technology utilizes indoor exhaust air to condense or evaporate a refrigerant in a heat exchanger so as to complete the recovery of energy in the exhaust air, and is one of important means for energy conservation of modern buildings. The heat pump heat recovery type fresh air dehumidifier adopting the technology can avoid air supply and exhaust cross pollution caused by the traditional exhaust heat recovery mode (namely sensible heat or a total heat exchanger), can also greatly or even completely bear indoor wet load, and realizes the integration of purification and dehumidification.
The traditional air conditioning equipment (such as a central air conditioner) lacks a temperature and humidity independent control means, so that excessive cooling capacity is caused to remove indoor moisture load, and even the indoor moisture load needs to be reheated again to a proper temperature, so that energy waste is caused. Meanwhile, if the matched fresh air system does not have the air processing capabilities of cooling, dehumidification and the like, the fresh air load can be introduced. If a radiation ceiling system capable of greatly improving the thermal comfort level is adopted, high-temperature cooling water (such as 15 ℃ water supply and 18 ℃ return water) is supplied in the capillary tube, and the radiation ceiling system is only responsible for treating all sensible heat loads in a chamber, needs to be matched with corresponding latent heat (wet load) treatment equipment, and also has the requirement of fresh air load treatment.
Therefore, a set of fresh air dehumidification equipment is required to be matched with the air conditioning equipment so as to meet the requirement of indoor fresh air and solve the problems that the traditional air conditioning equipment cannot control temperature and humidity and has excessive cooling at the same time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide an integral fresh air dehumidifier with a precooling water plate and a control method thereof.
The applicant selects the technical scheme in CN107747775A to perform the following analysis;
the double-cold-source fresh air machine comprises a first sub cold source system and a second sub cold source system, wherein the first sub cold source system supplies a cold source for a first heat exchanger and a fourth heat exchanger which are connected in parallel, and the second heat exchanger, a third heat exchanger and a fourth heat exchanger are connected in series in the second sub cold source system. The first sub-cold source system can be a water machine adopted in the traditional air conditioning equipment, supplies high-temperature cooling water, provides partial cooling water for a fresh air dehumidifier for cooling and precooling (a second heat exchanger) and takes away most of condensation heat (a fourth heat exchanger) while processing all sensible heat loads in the chamber. The second sub-cold source system is a refrigeration loop system of the fresh air dehumidifier and is responsible for deeply dehumidifying fresh air and then sending the dehumidified fresh air into a room, bearing all indoor latent heat and humidity loads and providing required fresh air.
One of the problems of the above-mentioned publication is that the unit lacks the capability of independent operation, relying on an external cold/hot water source (first sub-cold source system). When the first sub-cold source system fails and stops, the fourth heat exchanger cannot take away unnecessary condensation heat of the unit, and all the condensation heat of the second sub-cold source system is exhausted indoors, so that the air supply temperature is too high, and the indoor heat load is increased; meanwhile, the refrigerant charge of the system is difficult to balance, and all the refrigerant is gathered in the third heat exchanger serving as a condenser, so that the condensing pressure is too high, and the unit cannot run. Similarly, when the unit needs to heat, the second sub-cold source system is closed, the first sub-cold source system supplies hot water to the first heat exchanger for heating, and when the first sub-cold source system cannot supply external hot water, the unit does not have the heating capacity.
The second problem of the above patent is that the control method is complicated and difficult. The patent publication shows that the electronic expansion valve behind the third heat exchanger controls the amount of refrigerant in the reheating flow path, and further controls the air supply temperature of the unit; and the electronic expansion valve after the fourth heat exchanger controls the suction/exhaust superheat degree of the unit. However, there is a coupling conflict between the control of the two electronic expansion valves, and the action of any one electronic expansion valve can affect the control effect of the other expansion valve. For example, when the electronic expansion valve for controlling the superheat degree of the suction air is changed, the throttling device for controlling the flow ratio of the other main refrigerant is changed, otherwise, the throttling device cannot be adjusted, and the air supply temperature is difficult to guarantee. From the control theory, a complex decoupling control method is needed to realize a good control effect.
The purpose of the invention can be realized by the following technical scheme:
the invention aims to protect an integral fresh air dehumidifier with a precooling water plate, which comprises an air flow path, a refrigerant loop and a water flow path, wherein the air flow path comprises an air supply duct and an air exhaust duct, an air inlet and an air supply opening are arranged at two ends of the air supply duct, an air return opening and an air exhaust opening are arranged at two ends of the air exhaust duct, and an air mixing opening capable of communicating the air supply duct and the air exhaust duct is arranged between the air supply duct and the air exhaust duct;
the refrigerant loop comprises a compressor, a four-way reversing valve, an exhaust coil, a first one-way valve, an air supply coil, a throttling device and an air inlet coil which are connected in sequence;
the air supply system is characterized in that a water coil is arranged in front of an air inlet coil of the air supply duct, outdoor air inlet is subjected to preliminary cooling and dehumidification through the water coil in a dehumidification mode, and fresh air is heated through the water coil in a heating mode.
Further, be equipped with the humidifier behind the water coil pipe, the humidifier is used for humidifying the air supply that does not reach the humidity requirement after the water coil pipe heating under the mode of heating.
Furthermore, still be equipped with first bypass return circuit in the refrigerant loop, be equipped with the stop valve on the first bypass return circuit, the one end and the compressor gas vent of stop valve are connected, and the other end is connected on the pipeline between first check valve and air-supply coil pipe.
Furthermore, a second bypass loop is further arranged in the refrigerant loop, a second one-way valve is arranged on the second bypass loop, the second one-way valve is connected with the first one-way valve and the air supply coil in parallel, one end of the second one-way valve is connected to a pipeline between the air exhaust coil and the first one-way valve, and the other end of the second one-way valve is connected to a pipeline between the air supply coil and the throttling device.
Furthermore, four interfaces of the four-way reversing valve are respectively connected with the air inlet coil pipe, the air suction port of the compressor, the air exhaust coil pipe and the air exhaust port of the compressor.
Furthermore, the conduction direction of the first one-way valve is consistent with the flow direction of the refrigerant in the dehumidification mode, namely, the refrigerant is allowed to flow into the air supply coil from the air exhaust coil and is reversely cut off;
the conducting direction of the second one-way valve is consistent with the flow direction of the refrigerant in the heating mode, namely the refrigerant is allowed to flow to the exhaust coil from the throttling device and is reversely cut off.
Furthermore, the exhaust coil, the compressor, the four-way reversing valve, the first one-way valve, the first bypass loop and a stop valve thereon, and the second bypass loop and a second one-way valve thereon are arranged in the exhaust air duct;
the air inlet coil, the air supply coil and the throttling device are arranged in the air supply duct.
Further, the exhaust coil is arranged in an exhaust side water tray in the exhaust air duct at a certain inclination angle, and the air inlet coil and the air supply coil are arranged in an air supply side water tray in the air supply duct.
Furthermore, the air inlet, the air outlet and the air mixing port are all provided with servo-driven electric opening and closing air doors.
Furthermore, the air supply air port is provided with an air supply temperature and humidity sensor for monitoring the temperature and humidity of the supplied air; the return air inlet is provided with a return air quality sensor for monitoring the temperature, humidity and CO of return air (indoor)2Concentration, PM2.5 concentration, TVOC concentration, etc.
Furthermore, a stepless speed-regulating variable-frequency air supply fan is arranged at the air inlet section (behind the air mixing air door) of the air supply duct.
Furthermore, an air exhaust port of the air exhaust duct is provided with a stepless speed-regulating variable-frequency air exhaust fan.
Furthermore, an air filter is arranged in front of an air inlet coil pipe of the air supply duct and used for filtering air sent into a room, and a replacement opening is reserved on the side surface or the bottom surface of the unit. The air filter is arranged in a plurality of pieces, and different combinations can be adopted, such as a primary filter and a medium-high efficiency filter.
Furthermore, the humidifier can be selected from a wet film humidifier, an electrode type humidifier, an electric heating type humidifier and an ultrasonic humidifier.
Furthermore, the throttling device is one of a capillary tube, a throttling short tube or an electronic expansion valve, and the electronic expansion valve is preferably selected in the technical scheme in order to facilitate the realization of automatic control.
Furthermore, the stop valve is preferably an electromagnetic valve, is suitable for the high-temperature and high-pressure environment of the exhaust port of the compressor, and is favorable for realizing automatic control of the fresh air fan.
Furthermore, the air supply side water tray and the air exhaust side water tray are connected through a hose, and a water outlet is formed in the air exhaust side water tray.
The water flow path includes a water coil and an external cold/hot water source. The water coil pipe is integrated in the unit, and an inlet and an outlet for cold/hot water are reserved. The external cold/hot water source can be a natural water source or a water source cooled/heated by mechanical equipment such as a water machine and the like.
One typical application of the unit is to meet independent accurate control of the temperature and humidity inside a room in cooperation with a conventional water machine. The fresh air fan unit is used for controlling indoor humidity and removing all indoor wet loads; therefore, the high-temperature water machine can be used for preparing high-temperature cooling water with 15 ℃ return water and 18 ℃ return water, only takes charge of treating indoor sensible heat load, replaces low-temperature chilled water with 12 ℃ return water and 7 ℃ traditional water supply, further improves the evaporation temperature of the water machine, and improves the energy efficiency. The tail end used for matching with sensible heat load in the treatment chamber can adopt a fan coil or a capillary tube of a radiation ceiling.
The second purpose of the invention is to protect the control method of the integral fresh air dehumidifier with the precooling water plate, which is characterized in that the water coil pipe is matched with an external cold/hot water source:
in the dehumidification mode, the fresh air introduced from the air inlet is subjected to preliminary cooling and dehumidification treatment, so that the efficiency of deep dehumidification of the air inlet coil is improved, and the dehumidification load of the air inlet coil is reduced;
the fresh air is primarily heated in the heating mode, so that the isenthalpic humidification of the follow-up humidifier and the secondary reheating of the air inlet coil are facilitated.
Furthermore, the state of a refrigerant at the inlet of the air supply coil is changed through the opening and closing control of a stop valve on the first bypass loop, and the proportion of condensation reheating and supercooling reheating in the air supply coil is adjusted, so that the air supply temperature is ensured;
through the one-way effect that switches on of first check valve and second check valve, make under the dehumidification mode refrigerant flow through air supply coil for air after the reheat cooling dehumidification, guarantee air supply temperature avoids the tuber pipe condensation, and under the heating mode, the refrigerant then does not flow through air supply coil, avoids the low temperature refrigerant of air inlet coil export and the high temperature air of air inlet coil export further contact the heat transfer in air supply coil.
Through the switching of air flow path, refrigerant loop and water flow path, this technical scheme possesses the following mode of operation:
1. dehumidification mode (full fresh air): the air supply to the indoor is composed of outdoor fresh air. And (4) filtering, cooling, dehumidifying and reheating the outdoor fresh air, and then sending the fresh air to the indoor. Is suitable for hot and humid working conditions in summer.
2. Dehumidification mode (return air + fresh air mix): the air supply to the room is mainly the internal circulation of return air, and a small amount of fresh air is supplied at the same time. The return air is mixed with a small amount of outdoor fresh air, and then is sent to the indoor after being filtered, cooled, dehumidified and reheated. Is suitable for the indoor very humid working conditions such as Huangmei day and the like.
3. Dehumidification mode (full fresh air, low environmental condition): the air supply to the indoor is composed of outdoor fresh air. Is characterized in that the temperature of outdoor fresh air is lower (such as the working condition of 16 ℃ of dry bulb temperature and 14 ℃ of wet bulb temperature), but the dehumidification is still needed and the air supply temperature is ensured (higher than the dew point temperature corresponding to the indoor return air state or 22 ℃ specified by national standard).
4. Heating mode (full fresh air): the air supply to the indoor is composed of outdoor fresh air. The fresh air outside is sent to the room after being filtered, heated, humidified and the like. Is suitable for winter cold drying working conditions.
Further, the component states of the unit in each operation mode are as follows:
1. dehumidification mode (full fresh air): the air inlet air door, the air exhaust air door and the inclined air mixing air door are opened. And the air supply fan and the air exhaust fan are started. The water coil introduces external cold water. The humidifier is turned off. The port E of the four-way reversing valve is connected with the port S, so that the air inlet coil pipe is communicated with an air suction port of the compressor; the port C is connected with the port D, so that the exhaust coil is communicated with the exhaust port of the compressor. The shut-off valve is closed. The first one-way valve is turned on, and the second one-way valve is turned off in the opposite direction.
2. Dehumidification mode (return air + fresh air mix): the water coil is closed. The states of other parts are consistent with the dehumidification mode (full fresh air), but the rotating speeds of the air supply fan and the air exhaust fan are different. In a dehumidification mode (full fresh air), the rotation speed of an exhaust fan is high, the inclined air mixing air door has larger negative pressure at the side of an exhaust channel, and part of fresh air enters the exhaust channel and is mixed with return air and then is discharged; in a dehumidification mode (mixed return air and fresh air), the rotation speed of an exhaust fan is low, the inclined air mixing air door has larger negative pressure at the side of the air supply channel, and a large amount of return air enters the air supply channel and is mixed with a small amount of fresh air and then is sent into a room.
3. Dehumidification mode (full fresh air, low environmental condition): the water coil is closed. The inclined air mixing damper is closed. The rotational speed of the exhaust fan is reduced. A shutoff valve of the refrigerant loop is opened. The states of other parts are consistent with the dehumidification mode (full fresh air).
4. Heating mode (full fresh air): the component state of the air flow path is consistent with the dehumidification mode (full fresh air, low environmental condition), but the humidifier is opened. The water coil introduces external hot water. The flow direction of the refrigerant loop is reversed, and the port C of the four-way reversing valve is connected with the port S, so that the exhaust coil is communicated with the air suction port of the compressor; the port E is connected with the port D, so that the air inlet coil pipe is communicated with the exhaust port of the compressor. The shut-off valve is closed. The second one-way valve is switched on, and the first one-way valve is reversely cut off, so that the air supply coil is bypassed by short circuit.
Further, the air flow path state in the unit under each operation mode is as follows:
1. dehumidification mode (full fresh air): the outdoor fresh air is divided into two parts after being introduced from the air inlet, and one part of the fresh air is respectively filtered and purified by a primary effect and middle efficient filter, precooled and dehumidified by a water coil, deeply dehumidified by the air inlet coil and reheated by the air supply coil under the driving of an air supply fan and then is sent into the room by the air inlet; the other part enters the air exhaust channel from the inclined air mixing air door, is mixed with return air introduced from the return air inlet, and is exhausted to the outside from the air exhaust inlet after flowing through the air exhaust coil pipe to take away the condensation heat of the refrigerant under the driving of the air exhaust fan.
2. Dehumidification mode (return air + fresh air mix): the indoor return air is divided into two parts after being introduced from a return air inlet, and a small part of the indoor return air is driven by an exhaust fan and passes through an exhaust coil pipe to take away partial condensation heat and then is exhausted to the outside from an exhaust air inlet; the rest part enters the air supply channel from the inclined air mixing door under the drive of the air supply fan, is mixed with a small amount of fresh air introduced from the air inlet, and then flows through the primary effect and medium-efficiency filter for filtering and purifying, the air inlet coil for cooling and dehumidifying and the air supply coil for reheating respectively, and then is sent into the room through the air inlet.
3. Dehumidification mode (full fresh air, low environmental condition): outdoor fresh air is introduced from the air inlet, and is respectively filtered and purified by the primary effect and medium-efficiency filter, cooled and dehumidified by the air inlet coil and reheated by the air supply coil under the driving of the air supply fan, and then is sent into the room through the air supply air inlet. The indoor return air is introduced from the return air inlet, flows through the exhaust coil pipe under the drive of the exhaust fan to take away the condensation heat, and is exhausted to the outside from the exhaust air inlet.
4. Heating mode (full fresh air): outdoor fresh air is introduced from the air inlet, and is respectively filtered and purified by the primary and middle efficient filters, primarily heated by the water coil pipe, humidified by the humidifier and secondarily heated by the air inlet coil pipe under the driving of the air inlet fan, and then is sent into the room through the air outlet. The indoor return air is introduced from the return air inlet, is driven by the exhaust fan to flow through the exhaust coil for cooling, and is exhausted outdoors from the exhaust air inlet after the exhaust heat is recovered.
Further, the states of the refrigerant loop in the unit in each operation mode are as follows:
1. dehumidification mode (full fresh air): the refrigerant evaporates and absorbs heat in the air inlet coil pipe to form low-pressure steam, the low-pressure steam is sucked by the compressor through the four-way reversing valve to be compressed into high-temperature high-pressure refrigerant gas, the high-temperature high-pressure refrigerant gas flows through the four-way reversing valve to sequentially enter the air exhaust coil pipe and the air supply coil pipe for condensation and supercooling, the low-temperature high-pressure refrigerant flowing out of the air supply coil pipe is throttled by the throttling device to form low-temperature low-pressure refrigerant again, and the low-temperature low-pressure refrigerant returns to the air inlet coil pipe.
2. Dehumidification mode (return air + fresh air mix): the refrigerant loop state is consistent with the dehumidification mode (fresh air).
3. Dehumidification mode (full fresh air, low environmental condition): the refrigerant flow direction is the same as the dehumidification mode (fresh air). The difference lies in that the stop valve is opened, and the compressor exhaust is divided into two parts: except the branch which also flows through the exhaust coil for condensation, the other part of the air is directly bypassed to the inlet of the air supply coil, and the two parts are mixed and then enter the air supply coil for reheating air supply. By opening the stop valve, the state of a refrigerant at the inlet of the air supply coil is changed, the ratio of condensation reheating and supercooling reheating in the air supply coil is adjusted (the condensation reheating has larger heat exchange amount than the supercooling reheating), and the air supply temperature can be ensured even under low environment working conditions (for example, the air inlet dry bulb temperature is 16 ℃/wet bulb temperature is 14 ℃).
4. Heating mode (full fresh air): the refrigerant loop reverses and the flow direction is opposite to the dehumidification mode (full fresh air). The refrigerant evaporates and absorbs heat in the exhaust coil pipe to form low-pressure steam, is sucked by the compressor through the four-way reversing valve, is compressed to form high-temperature high-pressure refrigerant gas, then flows through the four-way reversing valve, enters the air inlet coil pipe to be condensed, dissipates heat to flowing air to form low-temperature high-pressure refrigerant liquid, flows out of the air inlet coil pipe, is throttled by the throttling device to form low-temperature low-pressure refrigerant again, and returns to the exhaust coil pipe through the second one-way valve.
Further, the flow path state of the water in the unit under each operation mode is as follows: and the water coil pipes are opened in a dehumidification mode (full fresh air) and a heating mode (full fresh air). And the water coil is closed in other modes.
Further, the control method in each operation mode is as follows:
1. dehumidification mode (full fresh air): the dehumidification capacity is adjusted by changing the rotating speed of the compressor, when the humidity measured at the air return air inlet is higher than a set value, the rotating speed of the compressor is increased, and otherwise, the rotating speed of the compressor is reduced. And controlling the suction superheat degree through the throttling device, and increasing the opening degree of the throttling device when the suction superheat degree is higher than a set value, otherwise, reducing the opening degree. Regulating indoor air quality by air supply fan, and measuring indoor CO2And if the concentration or the VOC concentration is higher than a set value, increasing the rotating speed of the air supply fan to improve the fresh air volume, and otherwise, reducing the rotating speed of the air supply fan to reduce the fresh air volume. The air exhaust fan is linked with the air supply fan, so that the air return quantity is always maintained at 80% -90% of the air supply quantity, and the indoor positive pressure of the air-conditioned room is controlled.
2. Dehumidification mode (return air + fresh air mix): the control strategy of the compressor and the throttling device is consistent with the dehumidification mode (full fresh air). The air supply fan and the air exhaust fan maintain constant-speed operation.
3. Dehumidification mode (full fresh air, low environmental condition): the control strategy of the compressor, the throttling device, the air supply fan and the air exhaust fan is consistent with the dehumidification mode (full fresh air).
4. Heating mode (full fresh air): the heating capacity is adjusted by changing the rotating speed of the compressor, when the temperature measured at the air supply air inlet is lower than a set value, the rotating speed of the compressor is increased, otherwise, the rotating speed of the compressor is reduced. The control of the throttling device, the air supply fan and the air exhaust fan is consistent with the dehumidification mode (full fresh air). The indoor humidity is controlled through the humidifier, when the humidity measured by the air return opening is lower than a set value, the water supply amount of the humidifier is increased, and otherwise, the water supply amount of the humidifier is reduced.
The invention has the following structural characteristics and beneficial effects of regulation and control:
1. be provided with the water coil pipe, with outside cold/hot water source cooperation, the new trend of introducing the air inlet wind gap under the dehumidification mode carries out preliminary cooling dehumidification processing earlier, has promoted the air inlet coil pipe and has carried out the efficiency of degree of depth dehumidification to reduce its dehumidification load, therefore the unit structure allows very compactly, can practice thrift installation space. The fresh air is primarily heated in the heating mode, so that the isenthalpic humidification of the follow-up humidifier and the secondary reheating of the air inlet coil are facilitated. In addition, when an external cold/hot water source cannot be provided temporarily, namely the water coil does not work, the complete refrigeration heat pump cycle design of the unit also allows the unit to operate independently, and the indoor fresh air requirement is also guaranteed.
2. The air supply system is provided with the first bypass loop of the refrigerant, the state of the refrigerant at the inlet of the air supply coil is changed by opening and closing the stop valve, the ratio of condensation reheating and supercooling reheating in the air supply coil is adjusted (the heat exchange amount of the condensation reheating is larger than that of the supercooling reheating), and the air supply temperature can be ensured even under the low environment working condition (for example, the air inlet dry bulb temperature is 16 ℃/wet bulb temperature is 14 ℃).
3. The refrigerant second bypass loop is arranged, and the refrigerant flows through the air supply coil in a dehumidification mode under the one-way conduction action of the first check valve and the second check valve, is used for reheating, cooling and dehumidifying air, and ensures the air supply temperature to avoid air pipe condensation; and under the heating mode, the refrigerant does not flow through the air supply coil, so that the low-temperature refrigerant at the outlet of the air inlet coil and the high-temperature air at the outlet of the air inlet coil are prevented from further contacting and exchanging heat in the air supply coil, and the heat loss caused by the fact that the air heated by the air inlet coil is cooled by the air supply coil is well avoided.
4. The variable-frequency air supply and exhaust fan and the inclined air mixing door are arranged, the rotating speeds of the air supply fan and the air exhaust fan are simply adjusted, and the sizes of the air pressures on the two sides of the air supply channel and the air exhaust channel are ingeniously converted, so that the dehumidification mode (full fresh air) and the dehumidification mode (mixed return air and fresh air) are realized on the premise that refrigerant flow paths are completely the same. The air exhaust fan has high rotating speed, the inclined air mixing air door has larger negative pressure at the side of the air exhaust channel, and part of fresh air enters the air exhaust channel and is mixed with return air and then is exhausted; the air exhaust fan of the air conditioner has low rotating speed, the inclined air mixing air door has larger negative pressure at the side of the air supply channel, and a large amount of return air enters the air supply channel and is mixed with a small amount of fresh air and then is sent into a room.
5. The air supply fan is arranged at the lower reaches of the inclined air mixing air door in the air supply air duct, but is positioned at the upper reaches of the components such as the air filter, the water coil pipe, the humidifier, the air inlet coil pipe and the air supply coil pipe, the indoor noise transmitted into the air supply fan through the air supply opening can be weakened by means of the components, and the user experience is improved. On the other hand, the arrangement of the air supply fan can enable the air supply side water tray to maintain positive pressure all the time, and the exhaust side water tray is located in a negative pressure area of the exhaust fan, so that condensed water of the air supply side water tray flows into the exhaust side water tray through the middle hose, and continuous and smooth drainage of the unit is guaranteed. And the condensed water in the water tray at the air exhaust side has a certain cooling effect on the coil pipe placed in the water tray under the air flow, so that the performance of the unit can be improved.
Compared with the prior art, the invention has the following advantages:
1. although the existing double-cold-source fresh air dehumidifier can be matched with an external cold/hot water source, when the external cold/hot water source cannot be guaranteed (for example, a water machine fails), the reliability of independent operation is difficult to guarantee, and the problems that the air supply temperature is too high and the filling amount is difficult to balance high-pressure alarm and the like due to the fact that a large amount of condensation heat cannot be removed exist. On the contrary, the unit only utilizes the water coil pipe to carry out precooling and dehumidification on fresh air, so as to help reduce load and improve energy efficiency (or preliminarily heat the fresh air in a heating mode), and the unit can completely independently operate without depending on an external cold/hot water source due to the complete self-sufficient refrigeration cycle flow path.
2. The existing double-cold-source fresh air dehumidifier is complex in control method and high in control difficulty, the main contradiction lies in that the control of two throttling devices in the system has coupling conflict, when the throttling device of the main control suction superheat degree changes, the other throttling device of the main control refrigerant flow proportion changes along with the change, otherwise, the reheating temperature of air supply cannot be guaranteed. Similarly, the operation of the throttle device for the master supply air temperature (refrigerant flow rate ratio) also affects the throttle device for the master intake air superheat. On the contrary, the air suction superheat degree of the unit is controlled by only adopting a single throttling device, when the air supply temperature is difficult to meet (for example, under a low environment working condition), the stop valve bypass exhaust is opened to guarantee the air supply temperature, and compared with the prior art, the control is simple, and coupling conflict does not exist.
3. Compared with the existing integral fresh air dehumidifier, the unit is provided with the water coil pipe, and the fresh air is subjected to preliminary cooling and dehumidifying treatment (or preliminary heating treatment) by virtue of an external cold/hot water source, so that the load is reduced, and the self efficiency of the unit is improved. And by combining the inclined air duct design at two sides, the unit has a very compact structure, and the installation space is greatly reduced.
4. Compared with the existing integral fresh air dehumidifier, the dehumidifier unit provides a dehumidification mode (mixed return air and fresh air) through simple and ingenious adjustment of the rotating speeds of the air supply fan and the air exhaust fan, so that a large amount of return air flows through the air inlet coil to be cooled and dehumidified, and the indoor humidity can be quickly and effectively reduced. Simultaneously, allow the air inlet wind gap to introduce partial new trend, improve indoor air quality, promote user experience.
5. Compared with the existing integral fresh air dehumidifier, the unit is provided with a refrigerant second bypass loop, so that the air supply coil takes on the reheating function in the dehumidification mode, and the air supply temperature is guaranteed; but can be bypassed under the heating mode, the low-temperature refrigerant at the outlet of the air inlet coil is not contacted with the high-temperature air at the outlet of the air inlet coil, and the heat loss of the air cooled by the air supply coil after the air is heated by the air inlet coil is avoided.
Drawings
FIG. 1 is a schematic structural diagram of an integrated fresh air dehumidifier in the present invention;
FIG. 2 is a schematic flow diagram of the integrated fresh air dehumidifier in dehumidification mode (fresh air);
FIG. 3 is a schematic view of the integrated fresh air dehumidifier of the present invention in the dehumidification mode (return air + fresh air mixing);
FIG. 4 is a schematic view showing the connection relationship of the refrigerant loops in the dehumidification mode (fresh air) and the dehumidification mode (return air + fresh air mixed) of the integrated fresh air dehumidifier of the present invention;
FIGS. 5 and 6 are a schematic view of the integrated fresh air dehumidifier in dehumidification mode (fresh air, low environmental condition) and a schematic view of the refrigerant loop connection relationship, respectively;
fig. 7 and 8 are schematic diagrams of the flow of the heating mode (fresh air) of the integrated fresh air dehumidifier and the connection relationship of the refrigerant loop.
In the figure: 1-an air supply channel; 2-an exhaust channel; 3-air inlet; 4-air supply port; 5-return air port; 6-air exhaust port; 7-air intake door; 8-air exhaust air door; 9-inclined air mixing damper; 10-air supply fan; 11-an exhaust fan; 12-water coiled tubing; 13-air intake coil pipe; 14-air supply coil pipe; 15-air exhaust coil pipe; 16-primary filter; 17-medium high efficiency filter; 18-a humidifier; 19-an electric control cabinet; 20-a compressor; a 21-four-way reversing valve; 22-a stop valve; 23-a second one-way valve; 24-a first one-way valve; 25-a throttling device; 26-water pan connecting pipe; 27-a water outlet; 28-air supply side water plate; 29-a side water drain pan.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. In the technical scheme, the features such as component model, material name, connection structure, control method, algorithm and the like which are not explicitly described are all regarded as common technical features disclosed in the prior art.
Example 1
An integral fresh air dehumidifier with a precooling water plate in the embodiment has a structure shown in fig. 1, and mainly comprises an air supply duct 1, an air exhaust duct 2, an air inlet 3, an air supply outlet 4, a return air outlet 5, an air exhaust outlet 6, an air inlet damper 7, an air exhaust damper 8, an inclined air mixing damper 9, an air supply fan 10, an air exhaust fan 11, a water coil 12, an air inlet coil 13, an air supply coil 14, an air exhaust coil 15, a primary filter 16, a middle-high efficiency filter 17, a humidifier 18, an electric control cabinet 19, a compressor 20, a four-way reversing valve 21, a stop valve 22, a second one-way valve 23, a first one-way valve 24, a throttling device 25, a water plate connecting pipe 26, a water outlet 27, an air supply side water plate 28 and an air exhaust side water plate 29.
The integral fresh air dehumidifier with the precooling water tray in the embodiment structurally comprises an air flow path, a refrigerant loop and a water flow path.
The air flow path of the present embodiment includes the bidirectional flow of the supply air duct 1 and the exhaust air duct 2. The two ends of the air supply duct 1 are provided with an air inlet 3 and an air supply outlet 4, and the two ends of the air exhaust duct 2 are provided with an air return outlet 5 and an air exhaust outlet 6. A mixed air port which can communicate the air supply duct 1 and the air exhaust duct 2 is arranged between the two ducts. The air inlet 3, the air outlet 6 and the air mixing port are all provided with servo-driven electric opening and closing air doors 7-9. And the air supply port 4 is provided with an air supply temperature and humidity sensor for monitoring the temperature and humidity of the supplied air. The return air inlet 5 is provided with a return air quality sensor for monitoring the temperature, humidity and CO of return air (indoor)2Concentration, PM2.5 concentration, TVOC concentration, etc. The inlet section (behind the air mixing door) of the air supply duct 1 and the air exhaust opening 6 of the air exhaust duct 2 are both provided with variable frequency fans 10 and 11 with stepless speed regulation. Air filters 16 and 17 are arranged in front of the air inlet coil 13 of the air supply duct 1 for filtering air supplied into the room. A water coil 12 is arranged in front of an air inlet coil 13 of the air supply duct 1 and is used for preliminary cooling and dehumidification treatment of outdoor inlet air in a dehumidification mode. A humidifier 18 is arranged between the air inlet coil 13 and the water coil 12 of the air supply duct 1 and is used for humidifying the air supply which does not reach the humidity requirement after being heated by the water coil 12 in the heating mode. The air supply side water tray 28 is arranged in the air supply duct 1 and is used for carrying condensed water generated when the water coil 12 and the air inlet coil 13 are dehumidified. The exhaust side water tray 29 is arranged in the exhaust air duct 2 and carries condensed water generated as an evaporator in the heating mode of the exhaust coil 15. The intake side water tray 28 and the exhaust side water tray 29 are connected by a hose 26, and accumulated water in the intake side water tray 28 is transferred to the exhaust side water tray 29 by wind pressure and exhausted wind is discharged from the exhaust side water tray 29The drain port 27 on the side of the duct 2.
The refrigerant loop (see fig. 4, 6, and 8) of the present embodiment is formed by sequentially connecting a compressor 20, a four-way reversing valve 21, an exhaust coil 15, a first check valve 24, an air supply coil 14, a throttling device 25, and an air intake coil 13. The interface E of the four-way reversing valve is connected with the air inlet coil pipe 13, the interface C is connected with the air exhaust coil pipe 15, and the interface S and the interface D are respectively connected with the air suction port and the air exhaust port of the compressor 20.
The refrigerant circuit of the present embodiment is further provided with first and second bypass circuits. The first bypass circuit is provided with a shut-off valve 22 having one end connected to the discharge of the compressor 20 and the other end connected to the line between the first check valve 24 and the supply coil 14. The second bypass circuit is provided with a second check valve 23, which is connected in parallel with the first check valve 24 and the air supply coil 14, one end of the second check valve is connected to a pipeline between the air exhaust coil 15 and the first check valve 24, and the other end of the second check valve is connected to a pipeline between the air supply coil 14 and the throttling device 25.
The water flow paths in this embodiment are the water coil 12 and an external cold/hot water source. The water coil pipe 12 is integrated in the unit, and an inlet and an outlet for cold/hot water are reserved. The external cold/hot water source can be a natural water source or a water source cooled/heated by mechanical equipment such as a water machine and the like.
Through the switching of air flow path, refrigerant loop and water flow path, this technical scheme possesses the following mode of operation:
1. dehumidification mode (full fresh air). Referring to fig. 2, the refrigerant loop connection is shown in fig. 4.
The air supply to the indoor in the mode is completely composed of outdoor fresh air. And (4) filtering, cooling, dehumidifying and reheating the outdoor fresh air, and then sending the fresh air to the indoor. Is suitable for hot and humid working conditions in summer.
The unit of this embodiment is under dehumidification mode (full new trend), and the part state is: the air inlet damper 7, the air outlet damper 8 and the inclined air mixing damper 9 are opened. The air supply fan 10 and the air exhaust fan 11 are started. The water coil 12 introduces external cold water. Humidifier 18 is turned off. The port E of the four-way reversing valve 21 is connected with the port S, so that the air inlet coil 13 is communicated with an air suction port of the compressor 20; the ports C and D are connected to communicate the exhaust coil 15 with the exhaust port of the compressor 20. The shut-off valve 22 is closed. The first check valve 24 is turned on and the second check valve 23 is turned off in the reverse direction.
In the dehumidification mode (fresh air), the air flow path state of the unit of the embodiment is as follows: the outdoor fresh air is divided into two parts after being introduced from the air inlet 3, and one part of the fresh air is respectively filtered and purified by a primary filter 16 and a middle high-efficiency filter 17, precooled and dehumidified by a water coil 12, deeply dehumidified by an air inlet coil 13 and reheated by an air supply coil 14 under the drive of an air supply fan 10 and then is sent into the room by the air inlet 4; the other part enters the exhaust channel 2 from the inclined air mixing door 9, is mixed with return air introduced from the return air inlet 5, flows through the exhaust coil 15 under the drive of the exhaust fan 11 to take away the condensation heat of the refrigerant, and then is exhausted to the outside from the exhaust air inlet 6.
In the dehumidification mode (fresh air), the refrigerant loop state of the unit of the embodiment is as follows: the refrigerant evaporates and absorbs heat in the air inlet coil 13 to be low-pressure steam, is sucked by the compressor 20 through the four-way reversing valve 21, is compressed into high-temperature high-pressure refrigerant gas, then flows through the four-way reversing valve 21, sequentially enters the air exhaust coil 15 and the air supply coil 14 for condensation, and the low-temperature high-pressure refrigerant flowing out of the air supply coil 14 is throttled by the throttling device 25 to become low-temperature low-pressure refrigerant again and returns to the air inlet coil 13.
This embodiment unit is under dehumidification mode (full new trend), and the water flow path state is: the water coil 12 is opened and an external cold water source is introduced.
In the dehumidification mode (full fresh air), the control method of the unit of the embodiment is as follows: the dehumidification capacity is adjusted by changing the rotation speed of the compressor 20, when the humidity measured at the return air inlet 5 is higher than a set value, the rotation speed of the compressor 20 is increased, otherwise, the rotation speed of the compressor 20 is reduced. The degree of superheat of the intake air is controlled by the throttle device 25, and when the degree of superheat of the intake air is higher than a set value, the opening degree of the throttle device 25 is increased, otherwise, the opening degree is decreased. The quality of indoor air is adjusted by the air supply fan 10, and the measured indoor CO is2The concentration or TVOC concentration is higher than the set value, the rotating speed of the air supply fan 10 is increased to improve the fresh air volume, otherwise, the rotating speed of the air supply fan 10 is reduced to reduce the fresh air volume. The exhaust fan 11 is linked with the air supply fan 10 to ensure that the return air volume is always maintained at 80-90% of the air supply volume% to control the positive indoor pressure of the air-conditioned room.
The unit of this embodiment is under dehumidification mode (full new trend), and structural feature and the beneficial effect who obtains are: the water coil pipe 12 is introduced into the unit and is matched with an external cold water source, the fresh air introduced from the air inlet 3 is subjected to preliminary cooling and dehumidifying treatment, the efficiency of deep dehumidifying by the air inlet coil pipe 13 is improved, and the dehumidifying load of the unit is reduced, so that the unit structure is allowed to be very compact, and the installation space can be saved. In addition, when an external cold water source cannot be provided temporarily, namely the water coil 12 does not work, the complete refrigeration cycle design of the unit also allows the unit to operate independently, and the indoor fresh air and dehumidification requirements are also guaranteed.
2. Dehumidification mode (return air + fresh air mix). Referring to fig. 3, the refrigerant loop connection is shown in fig. 4.
Most of the air supply to the room in the mode is internal circulation of return air, and a small amount of fresh air is supplied. The return air is mixed with a small amount of outdoor fresh air, and then is sent to the indoor after being filtered, cooled, dehumidified and reheated. Is suitable for the indoor very humid working conditions such as Huangmei day and the like.
The unit of this embodiment is under dehumidification mode (return air + new trend are mixed), and the part state is: the water coil 12 is closed. The states of other components are consistent with the dehumidification mode (full fresh air), but the rotating speeds of the air supply fan 10 and the air exhaust fan 11 are different. In a dehumidification mode (full fresh air), the rotation speed of the exhaust fan 11 is high, the inclined air mixing damper 9 has larger negative pressure at the side of the exhaust channel 2, and part of the fresh air enters the exhaust channel 2 and is mixed with return air and then is discharged; in a dehumidification mode (mixed return air and fresh air), the rotation speed of the exhaust fan 11 is low, the inclined air mixing air door 9 has larger negative pressure on the side of the air supply channel 1, and a large amount of return air enters the air supply channel 1 and is mixed with a small amount of fresh air and then is sent into a room.
In the dehumidification mode (mixed return air and fresh air), the air flow path state of the unit of the embodiment is as follows: the indoor return air is divided into two parts after being introduced from the return air inlet 5, and a small part of the indoor return air is driven by the exhaust fan 11 to flow through the exhaust coil 15 to take away part of condensation heat and then is exhausted to the outside from the exhaust air inlet 6; the rest part enters the air supply channel 1 from the inclined air mixing door 9 under the drive of the air supply fan 10, is mixed with a small amount of fresh air introduced from the air inlet 3, and then flows through the primary filter 16 and the middle high-efficiency filter 17 respectively for filtering and purifying, the air inlet coil 13 for cooling and dehumidifying and the air supply coil 14 for reheating, and then is sent into the room through the air inlet 4.
In the dehumidification mode (mixed return air and fresh air), the refrigerant loop state of the unit of the embodiment is as follows: the refrigerant loop state is consistent with the dehumidification mode (fresh air).
In the unit of this embodiment, under the dehumidification mode (return air + fresh air mix), the water flow path state is: the water coil 12 is closed and no external cold/hot water source is introduced.
In the dehumidification mode (mixed return air and fresh air), the control method of the unit of the embodiment is as follows: the control strategy of the compressor 20 and the throttling device 25 is consistent with the dehumidification mode (full fresh air). The supply fan 10 and the exhaust fan 11 are maintained to be operated at constant speeds.
The unit of the embodiment has the advantages that under the dehumidification mode (mixed of return air and fresh air), the structural characteristics and the obtained beneficial effects are as follows: under this mode, the unit is on dehumidification mode (full new trend) basis, through the rotational speed of simple regulation air supply fan 10 and the fan 11 of airing exhaust, the size of the passageway both sides wind pressure of sending, airing exhaust of ingenious conversion for a large amount of return air flows through air inlet coil 13 cooling dehumidification, can effectively reduce indoor humidity fast. Meanwhile, partial fresh air is allowed to be introduced into the air inlet 3, the indoor air quality is improved, and the user experience is improved.
3. Dehumidification mode (full fresh air, low environmental conditions). Referring to fig. 5, the refrigerant loop connection is shown in fig. 6.
The air supply to the indoor in the mode is completely composed of outdoor fresh air. Is characterized in that the temperature of outdoor fresh air is lower (such as the working condition of 16 ℃ of dry bulb temperature and 14 ℃ of wet bulb temperature), but the dehumidification is still needed and the air supply temperature is ensured (higher than the dew point temperature corresponding to the indoor return air state or 22 ℃ specified by national standard).
This embodiment unit is under dehumidification mode (full new trend, low environmental condition), and the part state is: the water coil 12 is closed. The inclined air mixing damper 9 is closed. The rotation speed of the exhaust fan 11 is reduced. The shut-off valve 22 of the refrigerant circuit is opened. The states of other parts are consistent with the dehumidification mode (full fresh air).
This embodiment unit is under dehumidification mode (full new trend, low environmental condition), and the air flow path state is: outdoor fresh air is introduced from the air inlet 3, and is respectively filtered and purified by the primary filter 16 and the middle high-efficiency filter 17, cooled and dehumidified by the air inlet coil 13, reheated by the air inlet coil 14 and then sent into the room through the air inlet 4 under the drive of the air supply fan 10. The indoor return air is introduced from the return air inlet 5, flows through the exhaust coil 15 under the drive of the exhaust fan 11 to take away the condensation heat, and is exhausted to the outdoor from the exhaust air inlet 6.
In the unit of this embodiment, under the dehumidification mode (full fresh air, low environmental condition), the refrigerant loop state is: the refrigerant flow direction is the same as the dehumidification mode (fresh air). The difference is that the shut-off valve 22 is open and the compressor 20 discharge is divided into two parts: except the branch which also flows through the exhaust coil 15 for condensation, the other part directly bypasses the inlet of the air supply coil 14, and the two parts are mixed and then enter the air supply coil 14 for reheating air supply.
This embodiment unit is under dehumidification mode (full new trend, low environmental condition), and the water flow path state is: the water coil 12 is closed and no external cold/hot water source is introduced.
In the dehumidification mode (full fresh air and low environment working condition), the control method of the unit comprises the following steps: the control strategy of the compressor 20, the throttling device 25, the air supply fan 10 and the air exhaust fan 11 is consistent with the dehumidification mode (full fresh air).
This embodiment unit is under dehumidification mode (full new trend, low environmental condition), and structural feature and the beneficial effect who gains are: in this mode, the state of the refrigerant at the inlet of the air supply coil 14 is changed by opening the stop valve 22, the ratio of condensation reheating and supercooling reheating in the air supply coil 14 is adjusted (the amount of heat exchange between condensation reheating and supercooling reheating is larger), and the air supply temperature can be ensured even under low environmental conditions (for example, the air inlet dry bulb temperature is 16 ℃/wet bulb temperature is 14 ℃).
4. Heating mode (full fresh air). Referring to fig. 7, the refrigerant loop connection is shown in fig. 8.
The air supply to the indoor in the mode is completely composed of outdoor fresh air. The fresh air outside is sent to the room after being filtered, heated, humidified and the like. Is suitable for winter cold drying working conditions.
In the unit of this embodiment, under the heating mode (fresh air), the part state is: the component state of the air flow path is consistent with the dehumidification mode (full fresh air, low ambient conditions), but the humidifier 18 is open. The water coil 12 introduces external hot water. The flow direction of the refrigerant loop is reversed, and the port C of the four-way reversing valve 21 is connected with the port S, so that the exhaust coil 15 is communicated with the air suction port of the compressor 20; the port E is connected with the port D, so that the air inlet coil pipe 13 is communicated with the exhaust port of the compressor 20. The shut-off valve 22 is closed. The second check valve 23 is turned on and the first check valve 24 is turned off in the opposite direction, so that the blower coil 14 is short-circuited and bypassed.
In the unit of this embodiment, under the heating mode (fresh air), the air flow path state is: outdoor fresh air is introduced from the air inlet 3, and is respectively filtered and purified by the primary filter 16 and the middle high-efficiency filter 17, primarily heated by the water coil pipe 12, humidified by the humidifier 18 and secondarily heated by the air inlet coil pipe 13 under the driving of the air inlet fan 10, and then is sent into the room through the air inlet 4. The indoor return air is introduced from the return air inlet 5, is driven by the exhaust fan 11, flows through the exhaust coil 15 to be cooled, is recycled and exhausted from the exhaust air inlet 6 to the outdoor after being exhausted.
In the unit of this embodiment, in the heating mode (fresh air), the refrigerant loop state is: the refrigerant loop reverses and the flow direction is opposite to the dehumidification mode (full fresh air). The refrigerant evaporates and absorbs heat in the exhaust coil 15 to be low-pressure steam, is sucked by the compressor 20 through the four-way reversing valve 21, is compressed to be high-temperature high-pressure refrigerant gas, then flows through the four-way reversing valve 21, enters the air inlet coil 13 to be condensed, dissipates heat to flowing air to be low-temperature high-pressure refrigerant liquid, flows out of the air inlet coil 13, is throttled by the throttling device 25 to become low-temperature low-pressure refrigerant again, and returns to the exhaust coil 15 through the second one-way valve 23.
In the unit of this embodiment, under the heating mode (fresh air), the water flow path state is: the water coil 12 is opened and an external hot water source is introduced.
In the heating mode (full fresh air), the control method of the unit of the embodiment is as follows: the heating capacity is adjusted by changing the rotation speed of the compressor 20, and when the temperature measured at the air supply port 4 is lower than a set value, the rotation speed of the compressor 20 is increased, otherwise, the rotation speed of the compressor 20 is decreased. The control of the throttling device 25, the air supply fan 10 and the air exhaust fan 11 is consistent with the dehumidification mode (full fresh air). The indoor humidity is controlled by the humidifier 18, and when the humidity measured by the return air inlet 5 is lower than a set value, the water supply amount of the humidifier 18 is increased, otherwise, the water supply amount of the humidifier 18 is decreased.
Under the heating mode (full fresh air) of this embodiment unit, structural feature and the beneficial effect who obtains are: in the mode, as the unit refrigerant loop is provided with the second bypass loop, the refrigerant does not flow through the air supply coil 14 under the mode through the switching-off action of the first one-way valve 24 and the switching-on action of the second one-way valve 23, the low-temperature refrigerant at the outlet of the air supply coil 13 and the high-temperature air at the outlet of the air supply coil 13 are prevented from further contacting and exchanging heat in the air supply coil 14, and the heat loss of the heated air which is cooled is well avoided.
The terms "first," "second," and the like are used herein to define components, as one skilled in the art would know: the use of the terms first, second, etc. are merely used to descriptively distinguish one element from another. Unless otherwise stated, the above words have no special meaning.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. An integral fresh air dehumidifier with a precooling water plate comprises an air flow path, a refrigerant loop and a water flow path, wherein the air flow path comprises an air supply duct and an air exhaust duct, the two ends of the air supply duct are provided with an air inlet and an air supply outlet, and the two ends of the air exhaust duct are provided with an air return outlet and an air exhaust outlet;
the refrigerant loop comprises a compressor, a four-way reversing valve, an exhaust coil, a first one-way valve, an air supply coil, a throttling device and an air inlet coil which are connected in sequence;
the air supply system is characterized in that a water coil is arranged in front of an air inlet coil of the air supply duct, outdoor air inlet is subjected to preliminary cooling and dehumidification through the water coil in a dehumidification mode, and fresh air is heated through the water coil in a heating mode.
2. The integral fresh air dehumidifier with the precooling water tray as claimed in claim 1, wherein a humidifier is arranged behind the water coil, and the humidifier is used for humidifying the supplied air which is not up to the humidity requirement after being heated by the water coil in the heating mode.
3. The integrated fresh air dehumidifier with the precooling water tray as claimed in claim 1, wherein a first bypass loop is further arranged in the refrigerant loop, a stop valve is arranged on the first bypass loop, one end of the stop valve is connected with the exhaust port of the compressor, and the other end of the stop valve is connected to a pipeline between the first check valve and the air supply coil.
4. The integrated fresh air dehumidifier with the precooling water tray as claimed in claim 1, wherein a second bypass loop is further arranged in the refrigerant loop, a second one-way valve is arranged on the second bypass loop, the second one-way valve is connected with the first one-way valve and the air supply coil in parallel, one end of the second one-way valve is connected to a pipeline between the air exhaust coil and the first one-way valve, and the other end of the second one-way valve is connected to a pipeline between the air supply coil and the throttling device.
5. The integrated fresh air dehumidifier with the precooling water tray as claimed in claim 1, wherein four ports of the four-way reversing valve are respectively connected with the air inlet coil, the air suction port of the compressor, the air exhaust coil and the air exhaust port of the compressor.
6. The integrated fresh air dehumidifier with the precooling water tray as claimed in claim 4, wherein the conducting direction of the first one-way valve is consistent with the flow direction of the refrigerant in the dehumidification mode, namely the refrigerant is allowed to flow into the air supply coil from the air exhaust coil and is reversely stopped;
the conducting direction of the second one-way valve is consistent with the flow direction of the refrigerant in the heating mode, namely the refrigerant is allowed to flow to the exhaust coil from the throttling device and is reversely cut off.
7. The integral fresh air dehumidifier with the precooling water tray as claimed in claim 1, wherein the exhaust coil, the compressor, the four-way reversing valve, the first one-way valve, the first bypass loop and the stop valve thereon, and the second bypass loop and the second one-way valve thereon are arranged in the exhaust air duct;
the air inlet coil, the air supply coil and the throttling device are arranged in the air supply duct.
8. The integrated fresh air dehumidifier with the precooling water tray as claimed in claim 1, wherein the exhaust coil is placed in an exhaust side water tray in an exhaust air duct at a certain inclination angle, and the intake coil and the supply coil are placed in a supply side water tray in a supply air duct.
9. A method for controlling an integral fresh air dehumidifier with a precooling water plate as claimed in any one of claims 1 to 8, wherein the water coil pipe is matched with an external cold/hot water source:
in the dehumidification mode, the fresh air introduced from the air inlet is subjected to preliminary cooling and dehumidification treatment, so that the efficiency of deep dehumidification of the air inlet coil is improved, and the dehumidification load of the air inlet coil is reduced;
the fresh air is primarily heated in the heating mode, so that the isenthalpic humidification of the follow-up humidifier and the secondary reheating of the air inlet coil are facilitated.
10. The control method of the integrated fresh air dehumidifier with the precooling water tray as claimed in claim 9, wherein the refrigerant state at the inlet of the air supply coil is changed by controlling the opening and closing of the stop valve on the first bypass circuit, and the ratio of condensation reheating and supercooling reheating in the air supply coil is adjusted, so as to ensure the air supply temperature;
through the one-way effect that switches on of first check valve and second check valve, air supply coil is flowed through to the refrigerant under the dehumidification mode for air after the reheat cooling dehumidification, the tuber pipe condensation is avoided to the guarantee air supply temperature, and under the heating mode, air supply coil is not flowed through to the refrigerant, further contact heat transfer in air supply coil with the high temperature air of the low temperature refrigerant of this air inlet coil export and air inlet coil export.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003130391A (en) * | 2001-10-18 | 2003-05-08 | Sanyo Electric Co Ltd | Air conditioner |
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| CN112325420A (en) * | 2020-10-15 | 2021-02-05 | 同济大学 | Heat pump heat recovery type fresh air fan with multiple working modes |
| CN112377998A (en) * | 2020-11-04 | 2021-02-19 | 同济大学 | All-condition heat pump heat recovery type fresh air fan with multiple reheating modes |
| CN112460696A (en) * | 2020-11-27 | 2021-03-09 | 同济大学 | Temperature and humidity independent control air conditioning system |
| CN112503680A (en) * | 2020-11-30 | 2021-03-16 | 同济大学 | Full-working-condition efficient fresh air fan for heat recovery of multistage heat pump |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003130391A (en) * | 2001-10-18 | 2003-05-08 | Sanyo Electric Co Ltd | Air conditioner |
| CN105890070A (en) * | 2016-06-01 | 2016-08-24 | 江苏慧居建筑科技有限公司 | Multi-condenser and double-return-air bypass dehumidification fresh air unit and air conditioning method |
| CN108253554A (en) * | 2017-12-15 | 2018-07-06 | 同济大学 | It is a kind of to be subcooled plus mix the air-cooled new wind turbine of solidifying heat pump heat reclamation type using return air |
| CN109000312A (en) * | 2018-06-08 | 2018-12-14 | 同济大学 | Monoblock type heat pump heat reclamation type fresh air dehumidifier with interior circulation pattern |
| CN112325420A (en) * | 2020-10-15 | 2021-02-05 | 同济大学 | Heat pump heat recovery type fresh air fan with multiple working modes |
| CN112377998A (en) * | 2020-11-04 | 2021-02-19 | 同济大学 | All-condition heat pump heat recovery type fresh air fan with multiple reheating modes |
| CN112460696A (en) * | 2020-11-27 | 2021-03-09 | 同济大学 | Temperature and humidity independent control air conditioning system |
| CN112503680A (en) * | 2020-11-30 | 2021-03-16 | 同济大学 | Full-working-condition efficient fresh air fan for heat recovery of multistage heat pump |
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| CN113932330B (en) | 2023-02-10 |
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