CN110411059B - Double-evaporation-temperature heat pump system, air conditioner and control method - Google Patents
Double-evaporation-temperature heat pump system, air conditioner and control method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 62
- 238000005057 refrigeration Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 238000001704 evaporation Methods 0.000 claims description 59
- 239000003507 refrigerant Substances 0.000 claims description 46
- 230000008020 evaporation Effects 0.000 claims description 30
- 238000010257 thawing Methods 0.000 claims description 17
- 230000009977 dual effect Effects 0.000 claims description 11
- 238000005338 heat storage Methods 0.000 claims description 10
- 239000002918 waste heat Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 239000002440 industrial waste Substances 0.000 claims description 3
- 230000006698 induction Effects 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 27
- 239000000498 cooling water Substances 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- 238000004378 air conditioning Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
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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
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0017—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using cold storage bodies, e.g. ice
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
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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
- F25B41/00—Fluid-circulation arrangements
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention provides a double-evaporation-temperature heat pump system, an air conditioner and a control method, wherein the double-evaporation-temperature heat pump system comprises: the compressor, the outdoor heat exchanger, indoor heat exchanger and intermediate heat exchanger, the compressor includes gas vent, first induction port and second induction port, still include the cross valve, four ends of cross valve communicate with gas vent, second induction port, the one end of outdoor heat exchanger and the one end of indoor heat exchanger respectively, the connection is provided with first throttling arrangement between outdoor heat exchanger and the indoor heat exchanger, still connect between the one end of outdoor heat exchanger or indoor heat exchanger and intermediate heat exchanger and be provided with second throttling arrangement, the other end and the first induction port intercommunication of intermediate heat exchanger. The invention can realize two different water outlet (air outlet) temperatures, meets the independent control target of temperature and humidity under refrigeration working conditions, and improves the system operation energy efficiency and the comfort of users; the system can meet the requirements of heating and refrigerating, improve the energy efficiency of the system and save the cost.
Description
Technical Field
The invention belongs to the technical field of heat pumps or air conditioners, and particularly relates to a double-evaporation-temperature heat pump system, an air conditioner and a control method.
Background
In recent years, with the increase of environmental pollution and the exhaustion of energy sources, there is a need to continuously promote air conditioning technology, and the goal of efficient operation of air conditioners is achieved by adopting efficient energy-saving technical means such as (temperature and humidity independent control technology and heat pump technology). The patent CN205505465U can only realize double-evaporation-temperature refrigeration, has a single function, cannot flexibly control the loads of two evaporation sides, does not have a mode of heating working conditions, and is idle in winter, so that resources are wasted.
Because a set of system in the heat pump or air-conditioning system in the prior art cannot realize the system design of double evaporation temperatures under both heating working conditions and refrigerating working conditions, the system has low running efficiency and higher cost; and the switching between the single evaporation temperature and the double evaporation temperature of the heating working condition and the refrigerating working condition cannot be realized; and the indoor heat source is utilized to defrost under the heating condition, so that the indoor comfort level is reduced, and the like.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the system operation efficiency is low because a set of system can not realize the system design of double evaporation temperatures under heating working conditions and refrigerating working conditions in the heat pump or air conditioning system in the prior art, thereby providing the double evaporation temperature heat pump system, the air conditioner and the control method.
The invention provides a double-evaporation temperature heat pump system, which particularly comprises:
the compressor, outdoor heat exchanger, indoor heat exchanger and intermediate heat exchanger, the compressor includes gas vent, first induction port and second induction port, still includes the cross valve, four ends of cross valve respectively with the gas vent the second induction port the one end of outdoor heat exchanger with the one end of indoor heat exchanger communicates, the outdoor heat exchanger with connect between the indoor heat exchanger and be provided with first throttling arrangement, the outdoor heat exchanger or indoor heat exchanger with still connect between the one end of intermediate heat exchanger and be provided with second throttling arrangement, the other end of intermediate heat exchanger with first induction port intercommunication.
Preferably, the method comprises the steps of,
a first bypass pipeline is further communicated between the first air suction port and the second air suction port, and a first control valve is further arranged on the first bypass pipeline.
Preferably, the method comprises the steps of,
the outdoor heat exchanger is also communicated with a second bypass pipeline in a branched manner between the outdoor heat exchanger and the first throttling device, the other end of the second bypass pipeline can be communicated with the second throttling device, and a second control valve is arranged on the second bypass pipeline.
Preferably, the method comprises the steps of,
and a third bypass pipeline is also branched and communicated between the indoor heat exchanger and the first throttling device, the other end of the third bypass pipeline can be communicated with the second throttling device, and a third control valve is arranged on the third bypass pipeline.
Preferably, the method comprises the steps of,
when the device is provided with a second bypass pipeline and a third bypass pipeline, one end of the second bypass pipeline is communicated with one end of the third bypass pipeline and then is communicated with the second throttling device.
Preferably, the method comprises the steps of,
the intermediate heat exchanger can exchange heat with a high-temperature heat source, wherein the high-temperature heat source comprises at least one of solar energy, industrial waste heat, living waste heat and river and lake water.
Preferably, the method comprises the steps of,
a heat accumulator is arranged between the intermediate heat exchanger and the high-temperature heat source; at least one three-way valve and/or a fan is/are also arranged between the heat accumulator and the intermediate heat exchanger.
The invention also provides an air conditioner comprising the double-evaporation-temperature heat pump system.
The invention also provides a control method of the double-evaporation-temperature heat pump system, which uses the double-evaporation-temperature heat pump system described in any one of the previous claims to switch among a refrigeration double-evaporation-temperature operation mode, a refrigeration single-evaporation-temperature operation mode, a heating double-heat-source operation mode, a heating single-heat-source operation mode or a defrosting operation mode.
Preferably, the method comprises the steps of,
when the refrigeration double evaporation temperature operation mode is needed:
and when the four-way valve comprises a first control valve, a second control valve, a third control valve, a first throttling device and a second throttling device, the four-way valve is controlled to enable the exhaust port to be communicated with the outdoor heat exchanger, the first control valve and the third control valve are controlled to be closed, the second control valve is controlled to be opened, and the first throttling device and the second throttling device are controlled to be opened.
Preferably, the method comprises the steps of,
when the refrigeration single evaporation temperature operation mode is needed and the medium temperature load is needed:
when the four-way valve is controlled to enable the exhaust port to be communicated with the outdoor heat exchanger, the first control valve is controlled to be opened, the third control valve is controlled to be closed, the second control valve is controlled to be opened, the opening degree of the first throttling device is controlled to be 0, and the second throttling device is controlled to be opened;
when the refrigeration single evaporation temperature operation mode is needed and the low temperature load requirement exists:
and when the four-way valve comprises a first control valve, a second control valve, a third control valve, a first throttling device and a second throttling device, the four-way valve is controlled to enable the exhaust port to be communicated with the outdoor heat exchanger, the first control valve is controlled to be opened, the second control valve and the third control valve are controlled to be closed, and the first throttling device is opened, wherein the low-temperature load means that the temperature reduction amplitude of the refrigerant is larger than that of the medium-temperature load.
Preferably, the method comprises the steps of,
when the heating double-heat-source operation mode is needed:
and when the indoor heat exchanger comprises a first control valve, a second control valve, a third control valve, a first throttling device and a second throttling device, the four-way valve is controlled to enable the exhaust port to be communicated with the indoor heat exchanger, the first control valve and the second control valve are controlled to be closed, the third control valve is controlled to be opened, and the first throttling device and the second throttling device are controlled to be opened.
Preferably, the method comprises the steps of,
when the heating single heat source operation mode is needed and the heat storage heat source is needed to be used, the following steps are carried out:
when the four-way valve is controlled to be communicated with the indoor heat exchanger, the first control valve is controlled to be opened, the second control valve is controlled to be closed, the third control valve is controlled to be opened, the opening degree of the first throttling device is controlled to be 0, and the second throttling device is controlled to be opened;
when a heating single heat source operation mode is required and an air heat source is required to be used:
and when the indoor heat exchanger comprises a first control valve, a second control valve, a third control valve, a first throttling device and a second throttling device, the four-way valve is controlled to enable the exhaust port to be communicated with the indoor heat exchanger, the first control valve is controlled to be opened, the second control valve and the third control valve are controlled to be closed, and the first throttling device is opened.
Preferably, the method comprises the steps of,
when a defrosting operation mode is required:
and when the four-way valve comprises a first control valve, a second control valve, a third control valve, a first throttling device and a second throttling device, the four-way valve is controlled to enable the exhaust port to be communicated with the outdoor heat exchanger, the first control valve is controlled to be opened, the second control valve is controlled to be opened, the third control valve is closed, the step number of the first throttling device is controlled to be 0, and the second throttling device is controlled to be opened.
The double-evaporation-temperature heat pump system, the air conditioner and the control method provided by the invention have the following beneficial effects:
according to the invention, the compressor is provided with two different air inlets in the cold-warm type heat pump system (four-way valve) and is connected with different pipelines, the first throttling device is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the second throttling device is arranged between the outdoor heat exchanger or the indoor heat exchanger and the intermediate heat exchanger, so that the outdoor heat exchanger is used as a condenser to release heat during refrigeration, the indoor heat exchanger and the intermediate heat exchanger are used as evaporators to absorb heat, two evaporators with different evaporation temperatures can be effectively formed, and the evaporators are conveyed back to the two air inlets of the different compressors, double-evaporation refrigeration cycle is completed, two different water outlet (air outlet) temperatures are realized, the independent control targets of temperature and humidity under refrigeration working conditions can be met, and the system operation energy efficiency and the comfort of users are improved; the invention provides an air-conditioning heat pump system with heating and refrigerating double working conditions and double evaporating temperatures, wherein the heating working conditions can simultaneously utilize two heat sources, and the running energy efficiency of the heat pump is improved. The refrigerating working condition can simultaneously improve two evaporating temperatures, can be suitable for occasions with independent temperature and humidity control, and one set of system can simultaneously meet the requirements of heating and refrigerating, especially the efficient running mode of the system, thereby greatly saving the cost; the indoor heat exchanger is used as a condenser to release heat during heating, the outdoor heat exchanger and the intermediate heat exchanger are used as evaporators to absorb heat, two evaporators with different evaporating temperatures can be effectively formed, two different heat sources outside and in the middle can be effectively utilized to supply heat for the room, two heat sources (an air source and a water source) are preferably operated at the same time, the energy efficiency of the system is improved by recovering high-temperature heat sources (such as solar energy, waste heat, river and lake water and the like), and the problem that the air source heat pump in a cold area is low in energy efficiency and prone to frosting is solved.
Drawings
FIG. 1 is a schematic diagram of the structure and operation of the dual evaporating temperature heat pump system of the present invention when operating in a cooling mode;
fig. 2 is a schematic diagram of the structure and operation of the dual evaporating temperature heat pump system of the present invention when operating in a heating mode.
The reference numerals in the drawings are as follows:
1. a compressor; 11. a first air suction port; 12. a second air suction port; 13. an exhaust port; 2. a four-way valve; 3. an outdoor heat exchanger; 4. an indoor heat exchanger; 5. a first throttle device; 6. a second throttle device; 7. an intermediate heat exchanger; 8. a second control valve; 9. a third control valve; 10. a blower; 110. a three-way valve; 130. a heat accumulator; 14. a high temperature heat source, 15, a first control valve; 101. a first bypass line; 102. a second bypass line; 103. and a third bypass line.
Detailed Description
As shown in fig. 1-2, the present invention provides a dual evaporating temperature heat pump system comprising:
the compressor 1, the outdoor heat exchanger 3, the indoor heat exchanger 4 and the intermediate heat exchanger 7, the compressor 1 includes an exhaust port 13, a first air suction port 11 and a second air suction port 12, and further includes a four-way valve 2, four ends of the four-way valve 2 are respectively communicated with the exhaust port 13, the second air suction port 12, one end of the outdoor heat exchanger 3 and one end of the indoor heat exchanger 4, a first throttling device 5 is connected between the outdoor heat exchanger 3 and the indoor heat exchanger 4, a second throttling device 6 is further connected between the outdoor heat exchanger 3 or the indoor heat exchanger 4 and one end of the intermediate heat exchanger 7, and the other end of the intermediate heat exchanger 7 is communicated with the first air suction port 11.
According to the invention, the compressor is provided with two different air inlets in the cold-warm type heat pump system (four-way valve) and is connected with different pipelines, the first throttling device is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the second throttling device is arranged between the outdoor heat exchanger or the indoor heat exchanger and the intermediate heat exchanger, so that the outdoor heat exchanger is used as a condenser to release heat during refrigeration, the indoor heat exchanger and the intermediate heat exchanger are used as evaporators to absorb heat, two evaporators with different evaporation temperatures can be effectively formed, and the evaporators are conveyed back to the two air inlets of the different compressors, double-evaporation refrigeration cycle is completed, two different water outlet (air outlet) temperatures are realized, the independent control targets of temperature and humidity under refrigeration working conditions can be met, and the system operation energy efficiency and the comfort of users are improved; the system can meet the requirements of heating and refrigerating at the same time, and particularly the system has a high-efficiency running mode, so that the cost is greatly saved; the indoor heat exchanger is used as a condenser to release heat during heating, the outdoor heat exchanger and the intermediate heat exchanger are used as evaporators to absorb heat, two evaporators with different evaporating temperatures can be effectively formed, two different heat sources outside and in the middle can be effectively utilized to supply heat for the room, two heat sources (an air source and a water source) are preferably operated at the same time, the energy efficiency of the system is improved by recovering high-temperature heat sources (such as solar energy, waste heat, river and lake water and the like), and the problem that the air source heat pump in a cold area is low in energy efficiency and prone to frosting is solved.
Preferably, the method comprises the steps of,
a first bypass line 101 is further disposed between the first air inlet 11 and the second air inlet 12, and a first control valve 15 (preferably, an electromagnetic valve) is further disposed on the first bypass line 101. Through the arrangement of the first bypass pipeline and the arrangement of the first control valve, the bypass electromagnetic valve is arranged at the double-suction inlet, when the bypass electromagnetic valve is opened, the two low-pressure cylinders are communicated, and the two low-pressure cylinders share one pressure, so that the connection between two different air suction ports of the compressor can be disconnected by controlling the first control valve to be closed when the double-evaporation temperature is required, and the connection is formed by controlling the first control valve to be opened when the single-evaporation temperature is required, thereby effectively switching between the double-evaporation temperature (two heat sources) and the single-evaporation temperature (single heat source), and realizing the switching between the single-evaporation temperature and the double-evaporation temperature of heating working conditions and refrigerating working conditions. Through the design of the system flow, the control target of double evaporation temperatures under heating and refrigerating working conditions can be realized simultaneously. The aim is to realize the basic requirements of temperature and humidity independent control of refrigeration working conditions and double heat source utilization under heating working conditions.
Preferably, the method comprises the steps of,
a second bypass line 102 is also branched and communicated between the outdoor heat exchanger 3 and the first throttling device 5, the other end of the second bypass line 102 can be communicated with the second throttling device 6, and a second control valve 8 is arranged on the second bypass line 102. By providing the second bypass line and the second control valve, it is possible to control whether or not a connection is formed between the outdoor heat exchanger 3 and the second throttling device 6, the intermediate heat exchanger 7, so that heat is released by the outdoor heat exchanger and heat is absorbed by the intermediate heat exchanger during cooling, and the second control valve is closed during heating so as to close the flow path between the outdoor heat exchanger and the intermediate heat exchanger.
Preferably, the method comprises the steps of,
a third bypass pipeline 103 is also branched and communicated between the indoor heat exchanger 4 and the first throttling device 5, the other end of the third bypass pipeline 103 can be communicated with the second throttling device 6, and a third control valve 9 is arranged on the third bypass pipeline 103. By providing the third bypass line and the third control valve, it is possible to control whether or not a connection is formed between the indoor heat exchanger 4 and the second throttle device 6 and between the indoor heat exchanger 7, so that heat is released by the indoor heat exchanger and heat is absorbed by the intermediate heat exchanger during heating, and the third control valve is closed during cooling so as to close the flow path between the indoor heat exchanger and the intermediate heat exchanger.
Preferably, the method comprises the steps of,
when the second bypass line 102 and the third bypass line 103 are provided, one end of the second bypass line 102 is connected to one end of the third bypass line 103 and then connected to the second throttling device 6. This is the preferred connection and connection of the two bypass lines of the present invention, making the structural arrangement simpler.
Preferably, the method comprises the steps of,
the intermediate heat exchanger 7 can exchange heat with a high-temperature heat source 14, wherein the high-temperature heat source comprises at least one of solar energy, industrial waste heat, living waste heat and river and lake water. By exchanging heat between the intermediate heat exchanger and the high temperature heat source, heat can be extracted from the high temperature heat source for heating the room and defrosting the outdoor heat exchanger.
Preferably, the method comprises the steps of,
a heat accumulator 130 is also arranged between the intermediate heat exchanger 7 and the high-temperature heat source 14; at least one three-way valve 110 and/or a fan 10 is also arranged between the heat accumulator 130 and the intermediate heat exchanger 7. The heat of the high-temperature heat source can be stored and stored through the heat accumulator, the three-way valve, the fan and the like, so that heat exchange can be performed with the intermediate heat exchanger when needed, and the purposes of heating or defrosting are achieved.
The invention also provides an air conditioner comprising the double-evaporation-temperature heat pump system. The invention adopts a single-machine double-cylinder double-suction compressor to realize different evaporating temperature control functions, and simultaneously, the heating mode and the refrigerating mode can be smoothly switched through the control of the four-way valve; the invention sets a bypass electromagnetic valve in the double-suction inlet, when the bypass electromagnetic valve is opened, the two low pressure cylinders are communicated, and share a pressure; by closing the refrigerant flow path of the indoor heat exchanger, only heat is absorbed from the high-temperature heat source for defrosting of the outdoor heat exchanger, so that the indoor environment temperature is prevented from greatly fluctuating.
The invention realizes the function of double evaporation temperatures under a single-system refrigeration and heating mode, realizes two different water outlet (air outlet) temperatures, can meet the independent control targets of temperature and humidity under refrigeration working conditions, and improves the system operation energy efficiency and the comfort of users. The heating working condition can simultaneously operate two heat sources (air source and water source), improves the energy efficiency of the system by recovering high-temperature heat sources (such as solar energy, waste heat, river and lake water and the like), and solves the problems of low energy efficiency and easy frosting of the air source heat pump in the cold area.
Through the design of the system flow, the control target of double evaporation temperatures under heating and refrigerating working conditions can be realized simultaneously. The aim is to realize the basic requirements of temperature and humidity independent control of refrigeration working conditions and double heat source utilization under heating working conditions. (simultaneously realizing double evaporation temperature control and capacity adjustment under heating and heating conditions).
The invention also provides a control method of the double-evaporation-temperature heat pump system, which uses the double-evaporation-temperature heat pump system described in any one of the previous claims to switch among a refrigeration double-evaporation-temperature operation mode, a refrigeration single-evaporation-temperature operation mode, a heating double-heat-source operation mode, a heating single-heat-source operation mode or a defrosting operation mode.
The invention adopts a single-machine double-cylinder double-suction compressor to realize different evaporating temperature control functions, and simultaneously, the heating mode and the refrigerating mode can be smoothly switched through the control of the four-way valve; the invention sets a bypass electromagnetic valve in the double-suction inlet, when the bypass electromagnetic valve is opened, the two low pressure cylinders are communicated, and share a pressure; by closing the refrigerant flow path of the indoor heat exchanger, only heat is absorbed from the high-temperature heat source for defrosting of the outdoor heat exchanger, so that the indoor environment temperature is prevented from greatly fluctuating.
The invention realizes the function of double evaporation temperatures under a single-system refrigeration and heating mode, realizes two different water outlet (air outlet) temperatures, can meet the independent control targets of temperature and humidity under refrigeration working conditions, and improves the system operation energy efficiency and the comfort of users. The heating working condition can simultaneously operate two heat sources (air source and water source), improves the energy efficiency of the system by recovering high-temperature heat sources (such as solar energy, waste heat, river and lake water and the like), and solves the problems of low energy efficiency and easy frosting of the air source heat pump in the cold area.
Through the design of the system flow, the control target of double evaporation temperatures under heating and refrigerating working conditions can be realized simultaneously. The aim is to realize the basic requirements of temperature and humidity independent control of refrigeration working conditions and double heat source utilization under heating working conditions. (simultaneously realizing double evaporation temperature control and capacity adjustment under heating and heating conditions)
Preferably, the method comprises the steps of,
when the refrigeration double evaporation temperature operation mode is needed:
and when the first control valve 15, the second control valve 8, the third control valve 9, the first throttling means 5 and the second throttling means are included at the same time, the four-way valve is controlled so that the exhaust port 13 communicates with the outdoor heat exchanger 3, the first control valve 15 and the third control valve 9 are controlled to be closed, the second control valve 8 is controlled to be opened, and the first throttling means 5 and the second throttling means 6 are controlled to be opened.
The invention is a preferable control mode of the refrigerating double-evaporation temperature operation mode, can effectively control the heat release of the outdoor heat exchanger, and absorb heat (acquire heat) from the indoor heat exchanger and the intermediate heat exchanger simultaneously, and simultaneously operates two heat sources (an air source and a water source), thereby realizing the function of double-evaporation temperature in a single-system refrigerating and heating mode, realizing two different water outlet (air outlet) temperatures, meeting the independent control targets of temperature and humidity in the refrigerating working condition, and improving the system operation energy efficiency and the comfort of users. .
Mode one: the refrigerating double-evaporation temperature operation mode comprises the following steps of: the first control valve 15 and the third control valve 9 are closed, and the second control valve 8 is opened.
The working flow is as follows: the high-temperature and high-pressure refrigerant gas of the double-cylinder double-suction compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 2 to be condensed into high-temperature refrigerant liquid and then is divided into two paths, wherein one path is throttled and depressurized through the first throttling device 5 and is evaporated into low-pressure refrigerant gas after absorbing heat of the environment in the indoor heat exchanger 4, and the low-pressure refrigerant gas enters one of low-pressure cylinders of the compressor. The other path of the refrigerant gas passes through a second control valve 8, is throttled and depressurized by a second throttling device 6, absorbs the heat of cooling water in a fan disc in an intermediate heat exchanger, reduces the temperature of the cooling water, and simultaneously evaporates into low-pressure refrigerant gas to enter the other low-pressure cylinder of the compressor.
Preferably, the method comprises the steps of,
when the refrigeration single evaporation temperature operation mode is needed and the medium temperature load is needed:
and when comprising the first control valve 15, the second control valve 8, the third control valve 9, the first throttling means 5 and the second throttling means simultaneously, controlling the four-way valve so that the exhaust port 13 communicates with the outdoor heat exchanger 3, controlling the first control valve 15 to be opened, and the third control valve 9 to be closed, controlling the second control valve 8 to be opened, the opening degree of the first throttling means 5 to be 0, and the second throttling means 6 to be opened;
when the refrigeration single evaporation temperature operation mode is needed and the low temperature load requirement exists:
and when the first control valve 15, the second control valve 8, the third control valve 9, the first throttling device 5 and the second throttling device are simultaneously included, the four-way valve is controlled so that the exhaust port 13 is communicated with the outdoor heat exchanger 3, the first control valve 15 is controlled to be opened, the second control valve 8 and the third control valve 9 are controlled to be closed, and the first throttling device 5 is opened, wherein the low-temperature load refers to the temperature reduction amplitude of the refrigerant when the temperature reduction amplitude of the refrigerant is larger than that of the medium-temperature load.
This is the preferred control mode for the refrigeration single evaporation temperature mode of operation of the present invention, mode two: the refrigerating single-evaporation temperature (medium temperature load) running mode can effectively control the heat release of the outdoor heat exchanger, absorb heat (acquire heat) from one of the indoor heat exchanger or the intermediate heat exchanger, select a heat source form (air source or water source) to be utilized according to needs, for example, intelligently select according to the indoor temperature condition and the temperature condition of a heat storage heat source of the intermediate heat exchanger, improve the intelligent control effect, greatly improve the heating efficiency, effectively realize the independent control effect of temperature and humidity, and improve the energy efficiency value and the comfort of the system.
Mode two: a refrigeration single evaporation temperature (medium temperature load) mode of operation; the control method comprises the following steps: the second control valve 8 is opened, the first control valve 15 is opened, and the number of steps of the first throttle device is adjusted to 0.
The working flow is as follows: the high-temperature and high-pressure refrigerant gas of the double-cylinder double-suction compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 2 to be condensed into high-temperature refrigerant liquid, the high-temperature refrigerant liquid is throttled and depressurized through the second throttle device 6 through the second control valve 8, the heat of cooling water in the air disc is absorbed in the intermediate heat exchanger, the temperature of the cooling water is reduced, and meanwhile the high-temperature and high-pressure refrigerant gas is evaporated into low-pressure refrigerant gas to enter two low-pressure cylinders of the compressor.
Mode three: a refrigeration single evaporation temperature (low temperature load) operation mode, a control method: closing the second control valve 8 and the third control valve 9, and opening the first control valve 15;
the working flow is as follows: the high-temperature and high-pressure refrigerant gas of the double-cylinder double-suction compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 2 to be condensed into high-temperature refrigerant liquid, is throttled and depressurized through the first throttling device 5 (preferably an electronic expansion valve) and absorbs heat of cooling water in the indoor heat exchanger, so that the temperature of the cooling water is reduced, and meanwhile, the high-temperature and high-pressure refrigerant gas is evaporated into low-pressure refrigerant gas to enter two low-pressure cylinders of the compressor.
Preferably, the method comprises the steps of,
when the heating double-heat-source operation mode is needed:
and when the first control valve 15, the second control valve 8, the third control valve 9, the first throttling device 5 and the second throttling device 6 are simultaneously included, the four-way valve is controlled so that the exhaust port 13 is communicated with the indoor heat exchanger 4, the first control valve 15 and the second control valve 8 are controlled to be closed, the third control valve 9 is controlled to be opened, and the first throttling device 5 and the second throttling device 6 are controlled to be opened.
This is the preferred control mode for the dual heat source mode of operation of the present invention, mode three: the heating double-heat-source operation mode can effectively control the indoor heat exchanger to heat and absorb heat (acquire heat) from the outdoor heat exchanger and the intermediate heat exchanger simultaneously, simultaneously operate two heat sources (an air source and a water source), and improve the energy efficiency of the system by recovering high-temperature heat sources (such as solar energy, waste heat, river and lake water and the like) and solve the problem of low energy efficiency of the air source heat pump in the cold region.
The control method comprises the following steps: the first control valve 15 and the second control valve 8 are closed, and the third control valve 9 is opened
The working flow is as follows: the high-temperature and high-pressure refrigerant gas of the double-cylinder double-suction compressor 1 enters an indoor heat exchanger 4 through a four-way valve 2 to be condensed into high-temperature refrigerant liquid, and then the high-temperature refrigerant liquid is divided into two paths, wherein one path is throttled and depressurized through a first throttling device 5 and is evaporated into low-pressure refrigerant gas after absorbing heat of the environment in an outdoor heat exchanger 3, and the low-pressure refrigerant gas enters one low-pressure cylinder of the compressor. The other path of the refrigerant gas passes through a third control valve 9, is throttled and depressurized by a second throttling device 6, absorbs the heat of cooling water of the heat storage box in the intermediate heat exchanger, reduces the temperature of the cooling water, and simultaneously evaporates into low-pressure refrigerant gas to enter the other low-pressure cylinder of the compressor.
Preferably, the method comprises the steps of,
when the heating single heat source operation mode is needed and the heat storage heat source is needed to be used, the following steps are carried out:
and when comprising the first control valve 15, the second control valve 8, the third control valve 9, the first throttling device 5 and the second throttling device at the same time, controlling the four-way valve to enable the exhaust port 13 to be communicated with the indoor heat exchanger 4, controlling the first control valve 15 to be opened, controlling the second control valve 8 to be closed, controlling the third control valve 9 to be opened, enabling the opening degree of the first throttling device 5 to be 0, and enabling the second throttling device 6 to be opened;
when a heating single heat source operation mode is required and an air heat source is required to be used:
and when the first control valve 15, the second control valve 8, the third control valve 9, the first throttling device 5 and the second throttling device are simultaneously included, the four-way valve is controlled so that the exhaust port 13 is communicated with the indoor heat exchanger 4, the first control valve 15 is controlled to be opened, the second control valve 8 and the third control valve 9 are controlled to be closed, and the first throttling device 5 is controlled to be opened.
This is the preferred control mode for the heating single heat source mode of operation of the present invention, mode three: the heating single heat source operation mode can effectively control the indoor heat exchanger to heat and absorb heat (acquire heat) from one of the outdoor heat exchanger or the intermediate heat exchanger, and the heat source form (air source or water source) is selected to be utilized according to the requirement, for example, intelligent selection is performed according to the outdoor temperature condition and the temperature condition of the heat storage heat source of the intermediate heat exchanger, so that the intelligent control effect is improved, the heating energy efficiency is greatly improved, and the problem of low energy efficiency of the air source heat pump in the cold region is solved.
Mode four: heating single heat source (heat storage heat source) operation mode
The control method comprises the following steps: closing the second control valve 8, opening the first control valve 15 and the third control valve 9, and adjusting the step number of the first throttling device 5 to 0;
the working flow is as follows: the high-temperature and high-pressure refrigerant gas of the double-cylinder double-suction compressor 1 enters the indoor heat exchanger 4 through the four-way valve 2 to be condensed into high-temperature refrigerant liquid, the high-temperature refrigerant liquid is throttled and depressurized through the third control valve 9 by the second throttling device 6, the heat of cooling water of the heat storage box is absorbed in the intermediate heat exchanger, the temperature of the cooling water is reduced, and meanwhile the high-temperature and high-pressure refrigerant gas is evaporated into two low-pressure cylinders of the low-pressure refrigerant gas entering the compressor.
Mode five: heating single heat source (air source) operation mode
The control method comprises the following steps: closing the second control valve 8 and the third control valve 9, and opening the first control valve 15;
the working flow is as follows: the high-temperature and high-pressure refrigerant gas of the double-cylinder double-suction compressor 1 enters an indoor heat exchanger 4 through a four-way valve 2 to be condensed into high-temperature refrigerant liquid, the high-temperature refrigerant liquid is throttled and depressurized by a first throttling device 5, heat of outdoor air is absorbed in an outdoor heat exchanger, and the high-temperature and high-pressure refrigerant gas is evaporated into low-pressure refrigerant gas to enter two low-pressure cylinders of the compressor.
Preferably, the method comprises the steps of,
when a defrosting operation mode is required:
and when the four-way valve 2 is controlled to be communicated with the outdoor heat exchanger 3 when the first control valve 15, the second control valve 8, the third control valve 9, the first throttling device 5 and the second throttling device are simultaneously included, the first control valve 15 is controlled to be opened, the second control valve 8 is controlled to be opened, the third control valve 9 is closed, the step number of the first throttling device 5 is controlled to be 0, and the second throttling device 6 is controlled to be opened.
The defrosting operation mode is a preferred control mode of the defrosting operation mode, can effectively control the outdoor heat exchanger to heat defrosting and absorb heat (acquire heat) from the intermediate heat exchanger, and cannot absorb heat from the room, so that the indoor heating temperature and the indoor heating comfort level are effectively ensured. Only absorbs heat from the high-temperature heat source for defrosting of the outdoor heat exchanger, thereby avoiding the occurrence of large fluctuation of indoor environment temperature
Mode six: defrosting mode
The control method comprises the following steps: closing the third control valve 9, opening the first control valve 15, and the second control valve 8, and adjusting the number of steps of the first throttle device 5 to 0
The working flow is as follows: the high-temperature and high-pressure refrigerant gas of the double-cylinder double-suction compressor 1 enters the outdoor heat exchanger 3 through the four-way valve 2 to defrost, the high-temperature refrigerant liquid is condensed into high-temperature refrigerant liquid to be throttled and depressurized through the second throttling device 6 through the second control valve 8 and absorb the heat of cooling water in the heat storage box in the intermediate heat exchanger, the temperature of the cooling water is reduced, and meanwhile the high-temperature and high-pressure refrigerant gas is evaporated into two low-pressure cylinders of which the low-pressure refrigerant gas enters the compressor, so that the defrosting process is completed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present invention, and these modifications and variations should also be regarded as the scope of the invention.
Claims (5)
1. A dual evaporating temperature heat pump system, characterized by: comprising the following steps:
the air conditioner comprises a compressor (1), an outdoor heat exchanger (3), an indoor heat exchanger (4) and an intermediate heat exchanger (7), wherein the compressor (1) comprises an air outlet (13), a first air suction port (11) and a second air suction port (12), and further comprises a four-way valve (2), four ends of the four-way valve (2) are respectively communicated with the air outlet (13), the second air suction port (12), one end of the outdoor heat exchanger (3) and one end of the indoor heat exchanger (4), a first throttling device (5) is connected between the outdoor heat exchanger (3) and the indoor heat exchanger (4), a second throttling device (6) is further connected between the indoor heat exchanger (3) or one end of the indoor heat exchanger (4) and one end of the intermediate heat exchanger (7), and the other end of the intermediate heat exchanger (7) is communicated with the first air suction port (11);
a first bypass pipeline (101) is further communicated between the first air suction port (11) and the second air suction port (12), and a first control valve (15) is further arranged on the first bypass pipeline (101);
a second bypass pipeline (102) is also branched and communicated between the outdoor heat exchanger (3) and the first throttling device (5), the other end of the second bypass pipeline (102) can be communicated with the second throttling device (6), and a second control valve (8) is arranged on the second bypass pipeline (102);
a third bypass pipeline (103) is also branched and communicated between the indoor heat exchanger (4) and the first throttling device (5), the other end of the third bypass pipeline (103) can be communicated with the second throttling device (6), and a third control valve (9) is arranged on the third bypass pipeline (103);
one end of the second bypass pipeline (102) is communicated with one end of the third bypass pipeline (103) and then is communicated with the second throttling device (6);
when the refrigeration double evaporation temperature operation mode is needed:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the outdoor heat exchanger (3), controlling the first control valve (15) and the third control valve (9) to be closed, and controlling the second control valve (8) to be opened and the first throttling device (5) and the second throttling device (6) to be opened;
when the refrigeration single evaporation temperature operation mode is needed and the medium temperature load is needed:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the outdoor heat exchanger (3), controlling the first control valve (15) to be opened, controlling the third control valve (9) to be closed, controlling the second control valve (8) to be opened, controlling the opening degree of the first throttling device (5) to be 0, and controlling the second throttling device (6) to be opened;
when the refrigeration single evaporation temperature operation mode is needed and the low temperature load requirement exists:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the outdoor heat exchanger (3), controlling the first control valve (15) to be opened, controlling the second control valve (8) and the third control valve (9) to be closed, and controlling the first throttling device (5) to be opened, wherein the low-temperature load refers to the temperature reduction range of the refrigerant when the temperature reduction range of the refrigerant is larger than that of the medium-temperature load;
when the heating double-heat-source operation mode is needed:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the indoor heat exchanger (4), controlling the first control valve (15) and the second control valve (8) to be closed, and controlling the third control valve (9) to be opened and the first throttling device (5) and the second throttling device (6) to be opened;
when the heating single heat source operation mode is needed and the heat storage heat source is needed to be used, the following steps are carried out:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the indoor heat exchanger (4), controlling the first control valve (15) to be opened, controlling the second control valve (8) to be closed, controlling the third control valve (9) to be opened, controlling the opening degree of the first throttling device (5) to be 0, and controlling the second throttling device (6) to be opened;
when a heating single heat source operation mode is required and an air heat source is required to be used:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the indoor heat exchanger (4), controlling the first control valve (15) to be opened, controlling the second control valve (8) and the third control valve (9) to be closed, and opening the first throttling device (5);
when a defrosting operation mode is required:
the four-way valve (2) is controlled to enable the exhaust port (13) to be communicated with the outdoor heat exchanger (3), the first control valve (15) is controlled to be opened, the second control valve (8) is controlled to be opened, the third control valve (9) is controlled to be closed, the step number of the first throttling device (5) is controlled to be 0, and the second throttling device (6) is controlled to be opened.
2. The dual evaporating temperature heat pump system of claim 1, wherein:
the intermediate heat exchanger (7) can exchange heat with a high-temperature heat source (14), wherein the high-temperature heat source comprises at least one of solar energy, industrial waste heat, living waste heat and river and lake water.
3. The dual evaporating temperature heat pump system of claim 2, wherein:
a heat accumulator (130) is arranged between the intermediate heat exchanger (7) and the high-temperature heat source (14); at least one three-way valve (110) and/or a fan (10) are/is arranged between the heat accumulator (130) and the intermediate heat exchanger (7).
4. An air conditioner, characterized in that: a dual evaporating temperature heat pump system comprising any of claims 1-3.
5. A control method of a double-evaporation-temperature heat pump system is characterized by comprising the following steps of:
use of a dual evaporating temperature heat pump system as in any one of claims 1-3, the control system switching between a cooling dual evaporating temperature mode of operation, a cooling single evaporating temperature mode of operation, a heating dual heat source mode of operation, a heating single heat source mode of operation or a defrosting mode of operation;
when the refrigeration double evaporation temperature operation mode is needed:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the outdoor heat exchanger (3), controlling the first control valve (15) and the third control valve (9) to be closed, and controlling the second control valve (8) to be opened and the first throttling device (5) and the second throttling device (6) to be opened;
when the refrigeration single evaporation temperature operation mode is needed and the medium temperature load is needed:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the outdoor heat exchanger (3), controlling the first control valve (15) to be opened, controlling the third control valve (9) to be closed, controlling the second control valve (8) to be opened, controlling the opening degree of the first throttling device (5) to be 0, and controlling the second throttling device (6) to be opened;
when the refrigeration single evaporation temperature operation mode is needed and the low temperature load requirement exists:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the outdoor heat exchanger (3), controlling the first control valve (15) to be opened, controlling the second control valve (8) and the third control valve (9) to be closed, and controlling the first throttling device (5) to be opened, wherein the low-temperature load refers to the temperature reduction range of the refrigerant when the temperature reduction range of the refrigerant is larger than that of the medium-temperature load;
when the heating double-heat-source operation mode is needed:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the indoor heat exchanger (4), controlling the first control valve (15) and the second control valve (8) to be closed, and controlling the third control valve (9) to be opened and the first throttling device (5) and the second throttling device (6) to be opened;
when the heating single heat source operation mode is needed and the heat storage heat source is needed to be used, the following steps are carried out:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the indoor heat exchanger (4), controlling the first control valve (15) to be opened, controlling the second control valve (8) to be closed, controlling the third control valve (9) to be opened, controlling the opening degree of the first throttling device (5) to be 0, and controlling the second throttling device (6) to be opened;
when a heating single heat source operation mode is required and an air heat source is required to be used:
controlling the four-way valve (2) to enable the exhaust port (13) to be communicated with the indoor heat exchanger (4), controlling the first control valve (15) to be opened, controlling the second control valve (8) and the third control valve (9) to be closed, and opening the first throttling device (5);
when a defrosting operation mode is required:
the four-way valve (2) is controlled to enable the exhaust port (13) to be communicated with the outdoor heat exchanger (3), the first control valve (15) is controlled to be opened, the second control valve (8) is controlled to be opened, the third control valve (9) is controlled to be closed, the step number of the first throttling device (5) is controlled to be 0, and the second throttling device (6) is controlled to be opened.
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| CN113531634A (en) * | 2020-04-17 | 2021-10-22 | 青岛海尔空调电子有限公司 | Solar energy and water source heat pump coupling system and method |
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| CN112325503B (en) * | 2020-09-28 | 2021-11-30 | 珠海格力电器股份有限公司 | Double-temperature heat pump air conditioning system, control method, intermediate heat exchanger and application |
| CN114517942A (en) * | 2021-03-24 | 2022-05-20 | 广东美的暖通设备有限公司 | Temperature adjustment device, air conditioning system, control method, and readable storage medium |
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