CN109579357B - Multi-online heat pump system with efficient heat recovery function and control method - Google Patents
Multi-online heat pump system with efficient heat recovery function and control method Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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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- Power Engineering (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides a multi-split heat pump system with high-efficiency heat recovery and a control method thereof.
Description
Technical Field
The invention relates to the technical field of heat pump systems, in particular to a multi-online heat pump system with efficient heat recovery and a control method.
Background
The multi-split heat pump system is widely used by people due to a flexible control method and a simple installation mode, but when the multi-split heat pump system is independently used for refrigeration, the heating quantity in the whole process is directly discharged to the outside through an outdoor unit arranged outdoors, so that the energy consumption of an outdoor fan is increased, the heat generated by refrigeration is directly discharged to cause energy waste, the existing multi-split heat pump system is directly connected in parallel or in series with a hot water system, and the heat generated in the refrigeration process of the heat pump system can be heated by a heat exchanger in the hot water system to prepare hot water, but the defects are as follows: firstly, the heat pump system can change the flow of the internal condensing agent according to the outdoor environment temperature, and the direct connection between the hydrothermal system and the heat pump system can be limited by the condensing pressure, so that the temperature of the prepared hot water is not high, and the use requirements of people can not be met; secondly, because the working condition difference between the heat pump system and the hot water system is large, the production speed is slow, and the heat pump system and the hot water system need to be effectively integrated so as to rapidly produce hot water temperature meeting the requirements of people at different outdoor temperatures.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a multi-online heat pump system with efficient heat recovery and a control method.
In order to achieve the above purpose, the multi-split heat pump system with high-efficiency heat recovery provided by the invention comprises an evaporator, a condenser, a first variable frequency compressor, a second variable frequency compressor, a four-way valve, a multi-split indoor unit and an outdoor heat exchanger, wherein four interfaces A, B, C, D of the four-way valve are respectively communicated with the output end of the second variable frequency compressor, one end of the outdoor heat exchanger, the input end R2 of the second variable frequency compressor and one end of the multi-split indoor unit, and the other end of the outdoor heat exchanger is communicated with the other end of the multi-split indoor unit; a first flow path and a second flow path which can exchange heat are arranged in the evaporator; the condenser also comprises a water tank, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve, a fourth electromagnetic valve and a fifth electromagnetic valve, wherein the outside of the water tank is respectively connected with an output port and an input port of the water tank through a preset heat exchange pipe, the heat exchange pipe circularly passes through the condenser, and two ends of the first electromagnetic valve are respectively communicated with an output end of the second variable frequency compressor and a connector A of the four-way valve; the components form a plate type heat recovery module and a heat pump heat recovery module of the system;
-said plate heat recovery module flow path consists of: two ends of the second electromagnetic valve are respectively communicated with the output end of the second variable frequency compressor and one end of the condenser, and two ends of the third electromagnetic valve are respectively communicated with the interface A of the four-way valve and the other end of the condenser;
-said heat pump heat recovery module flow path consists of: the output end of the first variable frequency compressor is communicated with one end of the condenser, two ends of a first flow path of the evaporator are respectively communicated with the input end of the first variable frequency compressor and the condenser, two ends of a second flow path of the evaporator are respectively communicated with a fourth electromagnetic valve and a fifth electromagnetic valve, the fourth electromagnetic valve is communicated with the output end of the second variable frequency compressor, and the fifth electromagnetic valve is communicated with an interface A of the four-way valve;
and one end of the oil separator is communicated with the output port of the second variable-frequency compressor, and the other end of the oil separator is respectively communicated with the first electromagnetic valve, the second electromagnetic valve and the fourth electromagnetic valve.
And the gas-liquid separator is arranged between the input end R2 of the second variable-frequency compressor and a connector C of the four-way valve.
The outdoor heat exchanger and the multi-connected indoor unit set are connected with the outdoor heat exchanger through a connector F, the connector G of the subcooler is connected with the connector F of the subcooler through a connector H, the connector F of the subcooler is connected with the connector G of the subcooler through a connector H, the connector G of the subcooler is connected with the input end R1 of the second variable frequency compressor, and a second electronic expansion valve is arranged between the connector F of the subcooler and the connector G.
Further, a third electronic expansion valve is arranged between the outdoor heat exchanger and a connector E of the subcooler.
Furthermore, the water heater also comprises a first temperature detector arranged in the water tank and used for monitoring the water temperature in real time and a second temperature detector arranged outdoors and used for monitoring the outdoor temperature in real time.
A control method of a multi-split heat pump system with high-efficiency heat recovery is characterized in that a first temperature detector is defined to monitor water temperature in real time to be real-time temperature T1, required water temperature is set temperature T1s, a second temperature detector is defined to monitor outdoor room temperature in real time to be real-time temperature T2, and required outdoor temperature is set temperature T2s, wherein the system correspondingly starts a plate type heat recovery module or a heat pump heat recovery module to work according to the size between real-time temperature T1 and set temperature T1s and the size between real-time temperature T2 and set temperature T2 s;
the heat pump heating mode is as follows: when the set temperature T1s is greater than the real-time temperature T1, if the set temperature T2s is greater than the real-time temperature T2, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are closed, the fourth electromagnetic valve and the fifth electromagnetic valve are opened, and the system starts the heat recovery module of the heat pump to start heating;
plate heating mode: when the set temperature T1s is greater than the real-time temperature T1, if the set temperature T2s is less than the real-time temperature T2, the first electromagnetic valve, the fourth electromagnetic valve and the fifth electromagnetic valve are closed, the second electromagnetic valve and the third electromagnetic valve are opened, and the system starts the plate heat recovery module to start heating;
and (3) closing the heating mode: and when the difference value between the set temperature Ts and the real-time temperature T is less than or equal to 0 degree, opening the first electromagnetic valve, the third electromagnetic valve and the fifth electromagnetic valve, closing the second electromagnetic valve and the fourth electromagnetic valve, and stopping starting the plate type heat recovery module or the heat pump heat recovery module by the system.
Further, when the system is in a heat pump heating mode, according to the difference value between the real-time temperature T1 and the preset temperature T1s, the working frequencies of the first variable-frequency compressor and the second variable-frequency compressor are gradually decreased/increased.
The invention adopts the scheme, and has the beneficial effects that: according to the invention, the plurality of electromagnetic valves are arranged between the hot water system and the heat pump system to be alternately switched on and off into different heating modes, so that not only can heat in the refrigeration of the heat pump be effectively used for heating water to realize heat recovery, but also the hot water system can be stably heated at different room temperatures in the refrigeration process of the heat pump system, and the invention has the advantages of energy consumption saving, simple and reliable structure, convenience in maintenance and the like.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a control flow chart of the present invention.
The system comprises a first electromagnetic valve 1, a second electromagnetic valve 2, a third electromagnetic valve 3, a fourth electromagnetic valve 4, a fifth electromagnetic valve 5, a water pump 6, a first variable frequency compressor 7, a first electronic expansion valve 8, an evaporator 9, a condenser 10, a water tank 11, a second variable frequency compressor 12, an oil separator 13, a four-way valve 14, an outdoor heat exchanger 15, a third electronic expansion valve 16, a second electronic expansion valve 17, a subcooler 18, an indoor heat exchanger 19, a gas-liquid separator 20, a first temperature detector 21, a second temperature detector 22 and an electromagnetic valve 23.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in the present embodiment, a multi-split heat pump system with high efficiency heat recovery mainly includes an evaporator 9, a condenser 10, a water tank 11, a water pump 6, a first inverter compressor 7, a second inverter compressor 12, a four-way valve 14, a multi-split indoor unit, a subcooler 18, an outdoor heat exchanger 15, an oil separator 13, a gas-liquid separator 20, a first electromagnetic valve 1, a second electromagnetic valve 2, a third electromagnetic valve 3, a fourth electromagnetic valve 4, and a fifth electromagnetic valve 5, wherein, in the present embodiment, the four-way valve 14 includes A, B, C, D four interfaces, the subcooler 18 includes E, F, G, H four interfaces, the multi-split indoor unit is connected in parallel by a plurality of indoor heat exchangers 19 (in the present embodiment, the number of the indoor heat exchangers 19 is three, and in addition, the number of the indoor heat exchangers 19 may be determined according to actual needs), specifically, an output end of the second inverter compressor 12 is communicated with an interface, the oil separator 13 is arranged between the second inverter compressor 12 and the four-way valve 14, that is, two ends of the oil separator 13 are respectively communicated and connected with the output end of the second inverter compressor 12 and the interface a of the four-way valve 14, two ends of the outdoor heat exchanger 15 are respectively communicated with the interface B of the four-way valve 14 and one end of any indoor heat exchanger 19, wherein, the subcooler 18 is arranged between the outdoor heat exchanger 15 and any indoor heat exchanger 19, the interface E and the interface G of the subcooler 18 are respectively communicated with one end of the outdoor heat exchanger 15 and one end of any indoor heat exchanger 19, the interface F and the interface H of the subcooler 18 are respectively communicated with the interface G of the subcooler 18 and the input end R1 of the second inverter compressor 12, furthermore, a third electronic expansion valve 16 is arranged between the interface E of the outdoor heat exchanger 15 and the subcooler 18, a second electronic expansion valve 17 is arranged between the interface F and the, the opening degree of the electronic expansion valve is set to adjust the supercooling degree and perform the throttling and pressure reducing functions on the refrigerant in the pipeline (the subcooler 18 and the electronic expansion valve are common parts in the field, and a skilled person can know through a related technical manual and does not describe the principle), the other end of any indoor heat exchanger 19 is communicated with the interface D of the four-way valve 14, in addition, two ends of the gas-liquid separator 20 are respectively communicated with the interface C of the four-way valve 14 and the input end R2 of the second inverter compressor 12, further, in the embodiment, an electromagnetic valve 23 is arranged between the interface H of the subcooler 18 and the input end R1 of the second inverter compressor 12, when the electromagnetic valve 23 is opened, the refrigerant passes through the output end of the second inverter compressor 12, the oil separator 13, the four-way valve 14, the outdoor heat exchanger 15, the interface E and the interface G of the subcooler 18, the second electronic expansion valve 17, the interface F and the interface H of the subcooler 18, and the input end By additionally arranging the auxiliary enthalpy-increasing flow path, part of the refrigerant can directly enter the second variable-frequency compressor 12 for liquid supplement or gas supplement in the refrigeration cycle process, so that the circulation volume and the sustainability of the heat pump system can be enhanced; in addition, in the present embodiment, two ends of the first electromagnetic valve 1 are respectively communicated with the output end of the second inverter compressor 12 and the interface a of the four-way valve 14 (since the oil separator 13 is between the second inverter compressor 12 and the four-way valve 14, that is, two ends of the first electromagnetic valve 1 are respectively communicated with the oil separator 13 and the interface a of the four-way valve 14), and whether the refrigerant passing through the output end of the second inverter compressor 12 enters the interface a of the four-way valve is controlled or blocked by opening and closing the first electromagnetic valve 1;
further, in this embodiment, a first flow path and a second flow path capable of exchanging heat are provided in the evaporator 9, the outside of the water tank 11 is respectively connected to an output port and an input port of the water tank 11 through a preset heat exchange tube, a water pump 6 is provided at the output port of the water tank 11, wherein the heat exchange tube passes through the condenser 10, water in the water tank 11 is pumped to the heat exchange tube by the water pump 6, and heated in the condenser 10 and then flows back to the water tank 11 to obtain required hot water, the above components constitute a plate heat recovery module and a heat pump heat recovery module of the system, and in this embodiment, the plate heat recovery module flow path is composed of: two ends of the second electromagnetic valve 2 are respectively communicated with an output end of the second inverter compressor 12 and one end of the condenser 10 (since the oil separator 13 is connected to the output end of the second inverter compressor 12, two ends of the second electromagnetic valve 2 are substantially respectively communicated with one ends of the oil separator 13 and the condenser 10), and two ends of the third electromagnetic valve 3 are respectively communicated with a port a of the four-way valve 14 and the other end of the condenser 10;
in addition, the heat pump heat recovery module flow path is composed of: the output end of the first inverter compressor 7 is communicated with one end of the condenser 10, two ends of a first flow path of the evaporator 9 are respectively communicated with the input end of the first inverter compressor 7 and the condenser 10, two ends of a second flow path of the evaporator 9 are respectively communicated with the fourth electromagnetic valve 4 and the fifth electromagnetic valve 5, the fourth electromagnetic valve 4 is communicated with the output end of the second inverter compressor 12 (since the oil separator 13 is connected to the output end of the second inverter compressor 12, the fourth electromagnetic valve 4 is substantially communicated with the oil separator 13), and the fifth electromagnetic valve 5 is communicated with an interface A of the four-way valve 14; further, a first electronic expansion valve 8 for throttling and depressurizing the refrigerant is provided between the condenser 10 and the evaporator 9.
The plate heat recovery module and the heat pump heat recovery module constitute a heat pump heating mode, a plate heating mode and a shutdown heating mode in the system of the present embodiment, in addition, the present embodiment further includes a first temperature detector 21 disposed in the water tank 11 and used for monitoring the water temperature in real time, and a second temperature detector 22 disposed outdoors and used for monitoring the outdoor temperature in real time, wherein the real-time monitored water temperature of the first temperature detector 21 is defined as a real-time temperature T1, the required water temperature is defined as a set temperature T1s, the real-time monitored outdoor temperature of the second temperature detector 22 is defined as a real-time temperature T2, and the required outdoor temperature is defined as a set temperature T2s, wherein the system correspondingly starts the plate heat recovery module or the heat pump heat recovery module to work according to the comparison between the real-time temperature T1 and the set temperature T1s and the comparison between the real-time temperature T2 and the set temperature T2s, in order to facilitate the understanding of the embodiment by the skilled person, the embodiment is described below with reference to specific examples:
as shown in fig. 2, when the set temperature T1s is greater than the real-time temperature T1, if the set temperature T2s is greater than the real-time temperature T2 (i.e., T2 is less than T2s, if T1 is less than T1 s), the system starts the heat pump heat recovery module to start heating operation because the flow rate (pressure) of the heat pump refrigerant is small; close first solenoid valve 1, second solenoid valve 2 and third solenoid valve 3, open fourth solenoid valve 4, fifth solenoid valve 5 and water pump 6, its working method is: the refrigerant which is in high temperature and high pressure and passes through the first inverter compressor 7 is condensed and released heat when flowing through the condenser 10 so as to heat water in a heat exchange pipe in the condenser 10 (the heated water returns to the water tank 11 through the heat exchange pipe), then the condensed refrigerant which is in liquid state is throttled and reduced in pressure by the electronic expansion valve 8 and evaporated by a first flow path of the evaporator 9 to be in gas state and flows back to the input end of the inverter compressor 7, so that the refrigerant is circularly heated, the refrigerant which is in high temperature and high pressure and passes through the output end of the second inverter compressor 12 is subjected to oil-gas separation by the oil separator 13 and then flows into a second flow path of the evaporator 9 through the fourth electromagnetic valve 4 to be released heat and cooled and exchanges heat with the refrigerant which flows to the first flow path in the evaporator 9 in the heat pump heat recovery module, namely, the refrigerant in the heat pump heat recovery module absorbs the heat of the refrigerant in the heat pump system in the evaporator 9, reducing the compression ratio, further improving the heating capacity and the energy efficiency ratio of the first inverter compressor 7, enabling the refrigerant to flow to a port A of a four-way valve 14 after flowing to a fifth electromagnetic valve 5 from a second flow path of an evaporator 9, enabling the refrigerant to flow to an outdoor heat exchanger 15 for condensation and heat release, enabling the refrigerant to be in a liquid state, throttling and reducing the pressure through a third electronic expansion valve 16, enabling the refrigerant to enter an indoor heat exchanger 19 for evaporation and refrigeration through a port E and a port G of a cooler 18, enabling the refrigerant in a gaseous state to flow to an input end R2 of the second inverter compressor 12 after gas-liquid separation through a port D and a port C of the four-way valve and a gas-liquid separator 20, and realizing heating work in a heat pump heating mode through circulation until the temperature difference (T1 s-T1;
further, according to the difference value (i.e., T1 s-T1) between the real-time temperature T1 and the preset temperature T1s, the adjustment makes the working frequencies of the first inverter compressor 7 and the second inverter compressor 12 gradually decrease or gradually increase, for example, when T1s-T1 is more than 5 and less than or equal to 10 ℃, the adjustment increases 1 stage on the original frequencies of the first inverter compressor 7 and the second inverter compressor 12; when the temperature is more than 10 ℃ from T1s to T1, the frequency of the first variable frequency compressor 7 is adjusted to be the maximum, the frequency of the second variable frequency compressor 12 is increased by 1 level on the original frequency, if the temperature is less than 5 ℃ from T1s to T1, the frequency of the variable frequency compressor 7 is adjusted to be reduced by 1 level on the original frequency, and the frequency of the second variable frequency compressor 12 is reduced by 1 level on the original frequency;
when the set temperature T1s is greater than the real-time temperature T1, if the set temperature T2s is less than the real-time temperature T2 (i.e., T2 is greater than or equal to T2s, if T1 is less than T1 s), the system starts the plate heat recovery module to start heating because the flow (pressure) of the heat pump refrigerant is large; close first solenoid valve 1, fourth solenoid valve 4 and fifth solenoid valve 5, open second solenoid valve 2 and third solenoid valve 3 and water pump 6, its working method is: the refrigerant which is at high temperature and high pressure and passes through the output end of the second inverter compressor 12 is subjected to oil-gas separation by the oil-gas separator 13, then is condensed and released heat when flowing into the condenser 10 through the second electromagnetic valve 2 to heat water flowing through the heat exchange tube in the condenser 10 (the heated water returns to the water tank 11 through the heat exchange tube), then is condensed and liquid-state refrigerant flows to the interface A of the four-way valve 14 through the third electromagnetic valve 3, then flows to the outdoor heat exchanger 15 to be condensed and released heat to be in a gas state, is throttled and decompressed by the third electronic expansion valve 16, then enters the indoor heat exchanger 19 through the interface E and the interface G of the subcooler 18 to be evaporated and refrigerated, and then flows to the input end R2 of the second inverter compressor 12 after being subjected to gas-liquid separation by the interface D and the interface C of the four-way valve 14 and the gas-liquid, until the temperature difference (T1 s-T1) is less than or equal to 0 ℃.
When the difference between the set temperature Ts and the real-time temperature T is less than or equal to 0 ° (i.e. T1s-T1 is less than or equal to 0 ℃), at this time, the heating mode is closed, the system stops starting the plate-type heat recovery module or the heat pump heat recovery module, opens the first electromagnetic valve 1, the third electromagnetic valve 3 and the fifth electromagnetic valve 5, closes the second electromagnetic valve 2 and the fourth electromagnetic valve 4, and the working mode of the heat pump system is as follows: the refrigerant which is high temperature and high pressure and passes through the output end of the second variable frequency compressor 12 is subjected to oil-gas separation through the oil separator 13 and then flows into the interface A of the four-way valve 14 through the first electromagnetic valve 1, then flows to the outdoor heat exchanger 15 to be condensed and released to be gaseous, and is throttled and depressurized through the third electronic expansion valve 16, the refrigerant enters the indoor heat exchanger 19 through the interface E and the interface G of the subcooler 18 to be evaporated and refrigerated, and the gaseous refrigerant flows to the input end R2 of the second variable frequency compressor 12 after being subjected to gas-liquid separation through the interface D and the interface C of the four-way valve 14 and the gas-liquid separator 20, so that the.
The above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes, modifications, and equivalents to the embodiments of the invention without departing from the scope of the invention as set forth in the claims below. Therefore, equivalent variations made according to the idea of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical solution of the present invention.
Claims (2)
1. A control method of a multi-online heat pump system with efficient heat recovery comprises a plate type heat recovery module and a heat pump heat recovery module;
the plate type heat recovery module comprises the following flow paths: two ends of the second electromagnetic valve (2) are respectively communicated with the output end of the second variable-frequency compressor (12) and one end of the condenser (10), and two ends of the third electromagnetic valve (3) are respectively communicated with the interface A of the four-way valve (14) and the other end of the condenser (10);
the heat pump heat recovery module comprises the following flow paths: the output end of the first variable frequency compressor (7) is communicated with one end of a condenser (10), two ends of a first flow path of an evaporator (9) are respectively communicated with the input end of the first variable frequency compressor (7) and the condenser (10), two ends of a second flow path of the evaporator (9) are respectively communicated with a fourth electromagnetic valve (4) and a fifth electromagnetic valve (5), the fourth electromagnetic valve (4) is communicated with the output end of the second variable frequency compressor (12), and the fifth electromagnetic valve (5) is communicated with an interface A of a four-way valve (14);
the water heater comprises a water tank (11), a first temperature detector (21) arranged in the water tank (11) and used for monitoring water temperature in real time, and a second temperature detector (22) arranged outdoors and used for monitoring outdoor temperature in real time, wherein the outside of the water tank (11) is respectively connected with an output port and an input port of the water tank (11) through preset heat exchange pipes, and the heat exchange pipes circularly pass through a condenser (10);
the method is characterized in that: defining the real-time monitoring water temperature of the first temperature detector (21) as a real-time temperature T1, the required water temperature as a set temperature T1s, the real-time monitoring outdoor room temperature of the second temperature detector (22) as a real-time temperature T2, and the required outdoor temperature as a set temperature T2s, wherein the system correspondingly starts a plate type heat recovery module or a heat pump heat recovery module to work according to the comparison between the real-time temperature T1 and the set temperature T1s and the comparison between the real-time temperature T2 and the set temperature T2 s;
the heat pump heating mode is as follows: when the set temperature T1s is greater than the real-time temperature T1, if the set temperature T2s is greater than the real-time temperature T2, the first electromagnetic valve (1), the second electromagnetic valve (2) and the third electromagnetic valve (3) are closed, the fourth electromagnetic valve (4) and the fifth electromagnetic valve (5) are opened, and the system starts the heat recovery module of the heat pump to start heating;
plate heating mode: when the set temperature T1s is greater than the real-time temperature T1, if the set temperature T2s is less than the real-time temperature T2, the first electromagnetic valve (1), the fourth electromagnetic valve (4) and the fifth electromagnetic valve (5) are closed, the second electromagnetic valve (2) and the third electromagnetic valve (3) are opened, and the system starts the plate type heat recovery module to start heating;
and (3) closing the heating mode: when the difference value between the set temperature Ts and the real-time temperature T1 is less than or equal to 0 ℃, the first electromagnetic valve (1), the third electromagnetic valve (3) and the fifth electromagnetic valve (5) are opened, the second electromagnetic valve (2) and the fourth electromagnetic valve (4) are closed, and the system stops starting the plate type heat recovery module or the heat pump heat recovery module.
2. The control method of a multi-split heat pump system with high efficiency heat recovery as set forth in claim 1, wherein: when the system is in a heat pump heating mode, according to the difference value between the real-time temperature T1 and the preset temperature T1s, the working frequency of the first inverter compressor (7) is gradually decreased/increased, and the working frequency of the second inverter compressor (12) is gradually decreased/increased.
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| CN102062495A (en) * | 2010-09-09 | 2011-05-18 | 宁波奥克斯电气有限公司 | Direct current variable frequency multifunctional air conditioning system and control method thereof |
| CN202581678U (en) * | 2012-03-28 | 2012-12-05 | Tcl空调器(中山)有限公司 | Multi-couple unit system with heat recovery function |
| CN102679482B (en) * | 2012-05-25 | 2014-09-17 | 宁波奥克斯空调有限公司 | Heat recovery multiplex system based on variable-frequency air conditioner and control method thereof |
| CN203595314U (en) * | 2013-07-03 | 2014-05-14 | Tcl空调器(中山)有限公司 | Multi-online system |
| CN203785307U (en) * | 2013-12-03 | 2014-08-20 | 李东灿 | Ultralow-temperature air energy double-compressor heat pump |
| CN108885031B (en) * | 2016-04-21 | 2020-06-19 | 三菱电机株式会社 | Heat-extraction recovery type air conditioning device |
| CN206269424U (en) * | 2016-10-26 | 2017-06-20 | 广东高而美制冷设备有限公司 | It is a kind of can recuperation of heat purging system |
| CN108088008B (en) * | 2017-12-12 | 2024-02-02 | 珠海格力电器股份有限公司 | Multi-split air conditioner and heat recovery system thereof |
| CN108731187B (en) * | 2018-06-20 | 2020-05-08 | 广东美的暖通设备有限公司 | Three-pipe heat recovery multi-split air conditioner system and control method thereof |
-
2018
- 2018-12-21 CN CN201811573058.XA patent/CN109579357B/en active Active
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