CN113108497B - Heat pump air conditioning system and control method thereof - Google Patents
Heat pump air conditioning system and control method thereof Download PDFInfo
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- CN113108497B CN113108497B CN202010158891.9A CN202010158891A CN113108497B CN 113108497 B CN113108497 B CN 113108497B CN 202010158891 A CN202010158891 A CN 202010158891A CN 113108497 B CN113108497 B CN 113108497B
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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Abstract
The application provides a heat pump air conditioning system and a control method thereof. The system comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device, a second throttling device, a main heat exchanger and a defrosting heat exchanger, wherein the defrosting heat exchanger is positioned on the upstream side of the air flow of the main heat exchanger; at least one of the air exhaust pipeline, the air suction pipeline and the defrosting pipeline of the compressor is provided with a refrigerant heating device. According to the heat pump air conditioning system, the frosting frequency of the main outdoor heat exchanger can be reduced, the heat input to the refrigerant of the whole system can be enhanced, and the continuous heat supply to the indoor space during the heating time and the defrosting period can be prolonged.
Description
Technical Field
The application relates to the technical field of air conditioning, in particular to a heat pump air conditioning system and a control method thereof.
Background
When the heat pump air conditioner is used under a low-temperature working condition, after the heat pump air conditioner operates for a period of time, the heat exchanger of the outer unit frosts, heat resistance and wind resistance are increased, heat exchange is not facilitated, performance of the air conditioner is poor, and in order to enable the air conditioner to operate normally, the air conditioner needs to be defrosted. The main defrosting mode of the existing air conditioner is to switch a four-way valve and change the direction of the four-way valve, in the defrosting process, an indoor fan is stopped, heat cannot be provided for the indoor, meanwhile, because the temperature of a refrigerant flowing through an indoor heat exchanger is low, heat can be absorbed from the indoor, the room temperature is reduced, and meanwhile, the comfort of the room is also reduced.
The air conditioning system adopts two outdoor heat exchangers, when the air conditioner is in a heating state, the two outdoor heat exchangers absorb heat at the same time, the heating quantity is improved, when the air conditioner is in a defrosting state, the indoor heat exchanger and one of the outdoor heat exchangers are in a condensation heat release state, the outdoor heat exchanger is used for heating air, the heated air is used for defrosting the other outdoor heat exchanger, and uninterrupted heating of the air conditioning system is realized.
However, for the air conditioning system, because the two outdoor heat exchangers are both in the evaporation and heat absorption states during heating, the frosting frequencies of the two outdoor heat exchangers are basically the same, and thus, the defrosting control needs to be performed in a short time when the air conditioning system works in the heating working condition, so that the working energy efficiency of the air conditioning system is reduced, the running time of the heating working condition with high energy efficiency is shortened, and the working performance of the air conditioning system is reduced.
Disclosure of Invention
Therefore, an object of the present invention is to provide a heat pump air conditioning system and a control method thereof, which can reduce the frosting frequency of a main outdoor heat exchanger in the heat pump air conditioning system, so that the heat pump air conditioning system can be in a normal heating condition for a long time, and improve the working energy efficiency of the heat pump air conditioning system.
In order to solve the problems, the application provides a heat pump air-conditioning system which comprises a compressor, a four-way valve, an indoor heat exchanger, a first throttling device, an outdoor heat exchanger and a second throttling device, wherein the first throttling device is positioned on a pipeline between the indoor heat exchanger and the outdoor heat exchanger, the outdoor heat exchanger comprises a main heat exchanger and a defrosting heat exchanger, the defrosting heat exchanger is positioned on the upstream side of the air flow of the main heat exchanger, the second throttling device is connected with the defrosting heat exchanger in series to form a defrosting pipeline, the defrosting pipeline can be connected with the main heat exchanger in series selectively, when the heat pump air-conditioning system is in a heating working condition, a refrigerant passes through the indoor heat exchanger, the first throttling device and the main heat exchanger from an exhaust port of the compressor, then is throttled by the second throttling device, then enters the defrosting heat exchanger after being throttled by the second throttling device, and then flows back to the compressor; at least one of the exhaust pipeline, the suction pipeline and the defrosting pipeline of the compressor is provided with a refrigerant heating device.
Preferably, the indoor heat exchanger is provided with electric auxiliary heat; and/or an inner fan is arranged at the indoor heat exchanger; and/or a branch pipeline is further connected between the main heat exchanger and the second throttling device, the branch pipeline can be connected to the air suction end of the compressor through the four-way valve, and a two-way valve is further arranged on the branch pipeline.
Preferably, the exhaust port of the compressor is connected with a four-way valve, and a bypass line is further provided at the exhaust port of the compressor, and the defrosting line can be selectively communicated with the four-way valve or the bypass line.
Preferably, the heat pump air conditioning system further comprises a three-way valve, and the defrosting pipeline, the bypass pipeline and the four-way valve are all connected to the three-way valve.
According to another aspect of the present application, there is provided a control method of the heat pump air conditioning system, including:
acquiring the operation condition of a heat pump air conditioning system;
when the heat pump air-conditioning system is in a heating working condition, the refrigerant is controlled to flow through the indoor heat exchanger, the first throttling device and the main heat exchanger from the exhaust port of the compressor, then flow through the second throttling device for throttling, then enter the defrosting heat exchanger, and then flow back to the compressor.
Preferably, the control method further includes:
when the heat pump air-conditioning system is in a defrosting condition, acquiring frosting conditions of the main heat exchanger and the defrosting heat exchanger;
and adjusting the communication condition of the defrosting pipeline according to the frosting conditions of the main heat exchanger and the defrosting heat exchanger.
Preferably, the step of adjusting the communication condition of the defrost line according to the frosting conditions of the main heat exchanger and the defrost heat exchanger includes:
when the main heat exchanger is not frosted and the defrosting heat exchanger is frosted, and a branch pipeline is connected between the main heat exchanger and the second throttling device and can be connected to the air suction end of the compressor through the four-way valve, and when a two-way valve is arranged on the branch pipeline, the defrosting pipeline is controlled to be communicated with the bypass pipeline, and the two-way valve is controlled to be opened;
the refrigerant is controlled to flow out of the compressor and then is divided into two paths, wherein one path of the refrigerant enters the main heat exchanger after passing through the indoor heat exchanger and the first throttling device, and then flows back to the compressor through the branch pipeline;
and the other path of the refrigerant flows through a bypass pipeline, the defrosting heat exchanger and a second throttling device, then enters the branch pipeline, and then flows back to the compressor.
Preferably, the step of adjusting the communication condition of the defrost line according to the frosting conditions of the main heat exchanger and the defrost heat exchanger includes:
when the main heat exchanger and the defrosting heat exchanger are frosted, the defrosting pipeline is controlled to be communicated with the four-way valve and disconnected from the bypass pipeline, and the two-way valve is controlled to close and close the branch pipeline;
controlling the first throttling device and the second throttling device to be at the maximum opening degree;
and the refrigerant is controlled to flow out of the compressor, then enters the indoor heat exchanger through the four-way valve, and then flows back to the compressor through the main heat exchanger and the defrosting heat exchanger in sequence.
Preferably, the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger and the defrosting heat exchanger further comprises:
turning on the electric auxiliary heater;
detecting the tube temperature of the indoor heat exchanger;
when the pipe temperature of the indoor heat exchanger is greater than T, controlling the opening of the inner fan;
and when the pipe temperature of the indoor heat exchanger is less than or equal to T, controlling the inner fan to be closed.
Preferably, when the refrigerant heating device is disposed on the discharge pipeline of the compressor: when the main heat exchanger is not frosted and the defrosting heat exchanger is frosted, the refrigerant heating device is started to heat the exhaust refrigerant of the compressor; when the main heat exchanger and the defrosting heat exchanger are frosted, the refrigerant heating device is started to heat the exhaust refrigerant of the compressor;
when the refrigerant heating device is arranged on the air suction pipeline of the compressor: when the main heat exchanger is not frosted and the defrosting heat exchanger is frosted, the refrigerant heating device is started to heat the air suction refrigerant of the compressor; when the main heat exchanger and the defrosting heat exchanger are frosted, the refrigerant heating device is started to heat the air suction refrigerant of the compressor;
when the refrigerant heating device is arranged on the defrosting pipeline: when the main heat exchanger is not frosted and the defrosting heat exchanger is frosted, the refrigerant heating device is started to heat the refrigerant in the defrosting pipeline; and when the main heat exchanger and the defrosting heat exchanger are frosted, the refrigerant heating device is started to heat the refrigerant in the defrosting pipeline.
The application provides a heat pump air conditioning system, including compressor, cross valve, indoor heat exchanger, first throttling arrangement, outdoor heat exchanger and second throttling arrangement, first throttling arrangement is located the pipeline between indoor heat exchanger and the outdoor heat exchanger, outdoor heat exchanger includes main heat exchanger and defrosting heat exchanger, the defrosting heat exchanger is located the air flow upstream side of main heat exchanger, second throttling arrangement establishes ties with the defrosting heat exchanger and forms the defrosting pipeline, the defrosting pipeline can select to establish ties with main heat exchanger, when heat pump air conditioning system is in the working condition of heating, the refrigerant from the gas vent of compressor through indoor heat exchanger, first throttling arrangement and through second throttling arrangement throttle behind the main heat exchanger, the warp again get into behind the second throttling arrangement throttle the defrosting heat exchanger, then flow back the compressor defrosting. When the heat pump air-conditioning system is in a heating working condition, the main heat exchanger and the defrosting heat exchanger are in an evaporation heat absorption mode, the refrigerant flows through the second throttling device for throttling and then enters the defrosting heat exchanger for absorbing heat, so that the temperature of the refrigerant in the defrosting heat exchanger is lower, the surface temperature of the defrosting heat exchanger is lower, the air flows through the defrosting heat exchanger firstly in the heat exchange process with the outdoor heat exchanger, the air can be dehumidified by the defrosting heat exchanger, the air flowing through the main heat exchanger after the heat exchange of the defrosting heat exchanger is drier, a frost layer is mainly distributed on the defrosting heat exchanger, the defrosting period of the main heat exchanger is prolonged, the frost condensation or icing of the main heat exchanger is effectively avoided, and the main heat exchanger provides main heat exchange for the operation of the heat pump air-conditioning system, so the frosting period of the main heat exchanger is effectively prolonged, the frosting speed of the main heat exchanger is reduced, the frosting frequency of the main outdoor heat exchanger in the heat pump air-conditioning system can be reduced, the heat pump air-conditioning system can be in a normal heating working condition for a long time, and the working energy efficiency of the heat pump air-conditioning system is improved; the invention also adds a refrigerant heating device in the system, which is used for improving the heating capacity of the system under the low-temperature working condition, can be arranged on the exhaust port pipeline, the air suction port pipeline and the branch of the defrosting heat exchanger, can enhance the heat input to the refrigerant of the whole system and improve the defrosting capacity, and realizes the continuous heat supply to the indoor by controlling the system during the heating operation of the heat pump air conditioner under the low-temperature working condition and the defrosting period.
Drawings
Fig. 1 is a heating system cycle diagram of a heat pump air conditioning system according to a first embodiment of the present application;
FIG. 2 is a cycle diagram of a bypass and bypass defrost system for a heat pump air conditioning system according to a first embodiment of the present application;
fig. 3 is a heating system cycle diagram of a heat pump air conditioning system according to a second embodiment of the present application;
FIG. 4 is a cycle diagram of a bypass and bypass defrost system for a heat pump air conditioning system according to a second embodiment of the present application;
fig. 5 is a heating system cycle diagram of a heat pump air conditioning system according to a third embodiment of the present application;
FIG. 6 is a cycle diagram of a bypass and bypass defrost system for a heat pump air conditioning system according to a third embodiment of the present application;
fig. 7 is a control flowchart of the heat pump air conditioning system according to the embodiment of the present application.
The reference numerals are represented as:
1. a compressor; 2. a four-way valve; 3. an indoor heat exchanger; 4. a first throttling device; 5. a second throttling device; 6. a primary heat exchanger; 7. a defrosting heat exchanger; 8. electrically assisting in heating; 9. a bypass line; 10. a three-way valve; 11. a two-way valve; 12. refrigerant heating device.
Detailed Description
Referring to fig. 1 to 6 in combination, according to an embodiment of the present application, a heat pump air conditioning system includes a compressor 1, a four-way valve 2, an indoor heat exchanger 3, a first throttling device 4, an outdoor heat exchanger and a second throttling device 5, the first throttling device 4 is located on a pipeline between the indoor heat exchanger 3 and the outdoor heat exchanger, the outdoor heat exchanger includes a main heat exchanger 6 and a defrosting heat exchanger 7, the defrosting heat exchanger 7 is located on an upstream side of an air flow of the main heat exchanger 6, the second throttling device 5 is connected in series with the defrosting heat exchanger 7 to form a defrosting pipeline, the defrosting pipeline can be selectively connected in series with the main heat exchanger 6, when the heat pump air conditioning system is in a heating working condition, a refrigerant passes through the indoor heat exchanger 3, the first throttling device 4 and the main heat exchanger 6 from an exhaust port of the compressor 1 and then passes through the second throttling device 5 for throttling, and then enters the defrosting heat exchanger 7 after being throttled by the second throttling device 5, then flows back to the compressor 1; at least one of the discharge line, the suction line and the defrost line of the compressor 1 is provided with a refrigerant heating device 12.
When the heat pump air-conditioning system is in a heating working condition, the main heat exchanger 6 and the defrosting heat exchanger 7 are in an evaporation heat absorption mode, the refrigerant firstly flows through the first throttling device 4 and the second throttling device 5 for two times and then enters the defrosting heat exchanger 7 for absorbing heat, so that the temperature of the refrigerant in the defrosting heat exchanger 7 is lower, the surface temperature of the defrosting heat exchanger 7 is lower, the air firstly flows through the defrosting heat exchanger 7 in the heat exchange process with the outdoor heat exchanger, the air can be dehumidified by the defrosting heat exchanger 7, the air which flows through the main heat exchanger 6 after the heat exchange of the defrosting heat exchanger 7 is drier, a frost layer is mainly distributed on the defrosting heat exchanger 7, the defrosting period of the main heat exchanger 6 is prolonged, the frost condensation or icing of the main heat exchanger 6 is effectively avoided, and the main heat exchanger 6 provides main heat exchange for the operation of the heat pump, therefore, the frosting period of the main heat exchanger 6 is effectively prolonged, the frosting speed of the main heat exchanger 6 is reduced, the frosting frequency of the main outdoor heat exchanger in the heat pump air-conditioning system can be reduced, the heat pump air-conditioning system can be in a normal heating working condition for a long time, and the working energy efficiency of the heat pump air-conditioning system is improved; the invention also adds a refrigerant heating device in the system, which is used for improving the heating capacity of the system under the low-temperature working condition, can be arranged on the exhaust port pipeline, the air suction port pipeline and the branch of the defrosting heat exchanger, can enhance the heat input to the refrigerant of the whole system and improve the defrosting capacity, and realizes the continuous heat supply to the indoor by controlling the system during the heating operation of the heat pump air conditioner under the low-temperature working condition and the defrosting period.
According to the heat pump air-conditioning system and the defrosting method thereof, the compressor of the heat pump air-conditioning system is not stopped during defrosting, continuous heat supply to the indoor space can be realized during defrosting, indoor comfort during defrosting is ensured, defrosting speed of an outdoor unit can be increased, and heat pump performance is improved.
1. The heat pump system divides an outer machine heat exchanger into two parts, namely an outer machine heat exchanger I (a main heat exchanger 6) and an outer machine heat exchanger II (a defrosting heat exchanger 7);
2. a second throttling device 5 is arranged between the first external machine heat exchanger and the second external machine heat exchanger;
3. during heating, the refrigerant passes through the first outdoor unit heat exchanger, the second throttling device 5 throttles and then enters the second outdoor unit heat exchanger, and the temperature of the refrigerant entering the second outdoor unit heat exchanger is lower due to secondary throttling, so that the air can be dehumidified, the air passing through the first outdoor unit heat exchanger is drier, and frost layers are distributed on the second outdoor unit heat exchanger and almost no frost layer exists in the first outdoor unit heat exchanger;
4. a refrigerant heating device is connected in series in the air-conditioning system and used for heating the refrigerant in the air-conditioning system and improving the heat of the system;
5. refrigerant divide into two the tunnel during the defrosting, and it is indoor continuous heat supply to pass through the inner heat exchanger all the way, and another way is used for outer quick-witted defrosting through outer quick-witted heat exchanger two, and just the defrosting in the period, outer fan does not stall (can stop, can not stop), and the electromechanical heat of assisting of while, realizes outer quick-witted defrosting simultaneously to indoor continuous heat supply, promotes indoor travelling comfort during the defrosting.
The indoor heat exchanger 3 is provided with electric auxiliary heat 8; and/or an inner fan is arranged at the indoor heat exchanger 3; and/or a branch pipeline is connected between the main heat exchanger 6 and the second throttling device 5, the branch pipeline can be connected to the air suction end of the compressor 1 through the four-way valve 2, and a two-way valve 11 is further arranged on the branch pipeline.
The four-way valve 2 is connected to the exhaust port of the compressor 1, and the bypass line 9 is further provided to the exhaust port of the compressor 1, and the defrosting line can be selectively communicated with the four-way valve 2 or the bypass line 9. The air outlet of the compressor 1 can be directly communicated with the defrosting pipeline through the bypass pipeline 9, so that the heat pump air-conditioning system can enable the refrigerant to directly flow through the indoor heat exchanger 3 and the defrosting heat exchanger 7 respectively through the air outlet of the compressor 1 as required, the refrigerant respectively enters the defrosting heat exchanger 7 to be defrosted and enters the indoor heat exchanger 3 and the main heat exchanger 6 to be converged after heat exchange, and then flows back to the compressor through a branch pipeline (a two-way valve opening pipeline), and the heat pump air-conditioning system is in bypass shunting defrosting system circulation under the condition.
When the first throttling device 4 and the second throttling device 5 are both in the maximum opening degree, the exhaust port of the compressor 1 can also enter the indoor heat exchanger 3 through the four-way valve 2, then the refrigerant flowing through the first throttling device 4 sequentially enters the main heat exchanger 6 and the defrosting heat exchanger 7 to release heat, the defrosting heat exchanger 7 and the main heat exchanger 6 are defrosted, in the whole process, the refrigerant does not absorb heat from the outside, and indoor heating and defrosting of the outdoor heat exchanger are performed by only utilizing the work of the compressor 1 and the heat accumulated before the refrigerant, and under the condition, the heat pump air-conditioning system is in the circulation of a hot gas non-shunting defrosting system.
The heat pump air conditioning system further comprises a three-way valve 10, and the defrosting pipeline, the bypass pipeline 9 and the four-way valve 2 are all connected to the three-way valve 10.
The heat pump air-conditioning system comprises a compressor, an inner machine heat exchanger, two throttling devices, a three-way valve, a four-way valve, an outer machine heat exchanger and a refrigerant heating device, wherein the outer machine heat exchanger is divided into two parts, namely an outer machine heat exchanger I (a main heat exchanger 6) and an outer machine heat exchanger II (a defrosting heat exchanger 7), the outer machine heat exchanger I is close to an outer machine fan blade, and the outer machine heat exchanger II is positioned on the windward side; the first throttling device 4 is positioned between the inner machine heat exchanger and the outer machine heat exchanger, and the second throttling device 5 is positioned between the first outer machine heat exchanger (a main heat exchanger 6) and the second outer machine heat exchanger (a defrosting heat exchanger 7) and is connected in series with the second outer machine heat exchanger in the system; meanwhile, the second throttling device 5 is connected with a pipeline where the second outer machine heat exchanger is located and the first outer machine heat exchanger in series; one end of the three-way valve is connected with the second external machine heat exchanger, the other end of the three-way valve is connected with the exhaust port of the compressor, and the third end of the three-way valve is connected with the four-way valve; the refrigerant heating devices are respectively designed at 3 positions of the system. Under the low-temperature working condition, when the heat pump air conditioner is used for heating, the system is controlled, so that the heating time is prolonged, and continuous heat supply to the indoor space is realized in the defrosting period.
Referring to fig. 1 to 2 and fig. 7 in combination, according to a first embodiment of the present application, the control method of the heat pump air conditioning system includes: acquiring the operation condition of a heat pump air conditioning system; when the heat pump air-conditioning system is in a heating working condition, a refrigerant is controlled to flow through the indoor heat exchanger 3, the first throttling device 4 and the main heat exchanger 6 from an exhaust port of the compressor 1, then flow through the second throttling device 5 for throttling, flow through the second throttling device 5, then enter the defrosting heat exchanger 7, and then flow back to the compressor 1.
The first embodiment: the system cycle of the heat pump air conditioner is shown in figure 1 during heating, a refrigerant heating device is arranged on a compressor exhaust port pipeline, a refrigerant flows out of a compressor exhaust port, passes through the refrigerant heating device, then enters an inner machine heat exchanger, passes through the inner machine heat exchanger, then enters a first throttling device 4, the throttled refrigerant firstly enters an outer machine heat exchanger I to exchange heat with outside air, and the heat-exchanged refrigerant passes through a second throttling device 5 to be throttled, then enters an outer machine heat exchanger II, finally returns to a compressor suction port through a three-way valve and a four-way valve, and a heating cycle of the refrigerant is completed. The refrigerant coming out of the first outer machine heat exchanger is throttled by the second throttling device 5, so that the temperature of the refrigerant entering the second outer machine heat exchanger is lower, the air can be dehumidified, the air passing through the first outer machine heat exchanger is drier, and thus the frost layer is distributed on the second outer machine heat exchanger and almost no frost layer exists in the first outer machine heat exchanger. During heating, the refrigerant heating device judges whether to work or not according to the temperature of the refrigerant at the refrigerant outlet of the compressor, when the temperature value is larger than the preset temperature value, the refrigerant heating device does not work, and when the temperature value is smaller than or equal to the preset temperature value, the refrigerant heating device works to promote the heat of the system so as to inhibit frosting and prolong the heating time.
During heating, the refrigerant heating device can be opened or closed according to outdoor working conditions, and when the operating condition of the heat pump is proper and the system capacity is not attenuated, the refrigerant heating device does not need to be opened; when the heat pump operates under low-temperature severe working conditions, the refrigerant heating device is started to achieve the effects of inhibiting frosting and prolonging heating time.
During defrosting, the defrosting mode is divided into three defrosting modes according to the frosting conditions of the first outdoor heat exchanger and the second outdoor heat exchanger, namely bypass flow diversion defrosting, hot defrosting and four-way valve reversing defrosting respectively, and the implementation and operation of the three defrosting modes are judged according to the pipe temperature of the outdoor heat exchanger.
The circulation of the heat pump air-conditioning system is shown in fig. 2 during defrosting, the four-way valve is not reversed during defrosting, the refrigerant flows out from the exhaust port of the compressor and passes through the refrigerant heating device to be divided into 2 paths, and the 1 path of refrigerant passes through the inner heat exchanger, the first throttling device 4 and the first outer heat exchanger (the main heat exchanger 6); the other path of the air passes through a three-way valve, an external machine heat exchanger II (a defrosting heat exchanger 7) and a second throttling device 5; and the refrigerant passing through the first and second throttling devices 5 of the external machine heat exchanger is collected together, and returns to the air suction port of the compressor after passing through the two-way valve and the four-way valve, thereby completing a cycle of the refrigerant during defrosting. During defrosting, the refrigerant is divided into two paths, one path of refrigerant passes through the inner machine heat exchanger to continuously supply heat to the indoor space, and the other path of refrigerant passes through the outer machine heat exchanger to defrost the outer machine. During defrosting, the refrigerant heating device judges whether to work or not according to the temperature of the refrigerant at the refrigerant outlet of the compressor, when the temperature value is greater than the preset temperature value, the refrigerant heating device does not work, and when the temperature value is less than or equal to the preset temperature value, the refrigerant heating device works to promote the heat of the system and improve the defrosting speed. And the inner fan blade and the outer fan blade do not stop rotating during defrosting, and the inner motor is electrically assisted with heat to be turned on, so that continuous heat supply to the indoor space is realized while the outer unit defrosts, and the indoor comfort during defrosting is improved.
In the scheme, the position of a refrigerant inlet and a refrigerant outlet of the first outdoor unit heat exchanger are not limited, and the refrigerant can enter from the lower end of the first outdoor unit heat exchanger and flow out from the upper end of the first outdoor unit heat exchanger; or the refrigerant enters from the upper end of the first external machine heat exchanger and flows out from the lower end of the first external machine heat exchanger.
The first and second throttling devices in the scheme are not limited and can be capillary throttling, throttling short pipe throttling, electronic expansion valve throttling and the like, and meanwhile, the throttling devices 1 and 2 can be combined by using different throttling devices and can also be used by using the same throttling device.
The form of outer quick-witted heat exchanger is not restricted in this scheme, can be tube fin heat exchanger, also can be microchannel heat exchanger etc. specifically selects according to the in service behavior.
The function of the three-way valve in the scheme is not limited, and two-way valves can be used instead.
Bypass flow diversion defrosting: when the first external machine heat exchanger (the main heat exchanger 6) does not frost and the frost layer is only distributed on the second external machine heat exchanger (the defrosting heat exchanger 7), the system circulates during defrosting as shown in fig. 2. The compressor continuously operates during defrosting, the four-way valve does not reverse, the refrigerant comes out from the exhaust port of the compressor, passes through one path of refrigerant heating device, sequentially passes through the inner machine heat exchanger, the first throttling device 4, the first outer machine heat exchanger, the second throttling device 5, the three-way valve 10, the four-way valve and the refrigerant heating device 12 and returns to the suction port of the compressor, and one cycle of the refrigerant during defrosting is completed. Meanwhile, during defrosting, after the refrigerant coming out of the compressor is heated by the refrigerant heating device, the heating capacity of the system is improved, one path of refrigerant passes through the inner machine heat exchanger to continuously provide heat for the indoor space, and meanwhile, the inner machine electric auxiliary heat is started, so that the indoor heat supply is improved; the other path of the heat is transmitted to an external machine heat exchanger II through a three-way valve, so that the defrosting speed of the external machine is increased, and the performance of the heat pump is improved. During defrosting, the system controls the rotation or stop of the inner fan and the outer fan according to the frosting condition of the outer unit, so that continuous heat supply to the indoor space is realized while defrosting of the outer unit is realized, and the indoor comfort during defrosting is improved.
Hot air defrosting: the first external machine heat exchanger (the main heat exchanger 6) and the second external machine heat exchanger (the defrosting heat exchanger 7) are frosted, and when the first external machine heat exchanger is frosted slightly, a circulation diagram of the defrosting system is shown in fig. 3. During defrosting, the compressor continuously operates, the four-way valve does not change direction, the refrigerant does not flow in a shunting way after coming out of an exhaust port of the compressor, the refrigerant continuously supplies heat to the indoor space through the heat exchanger of the inner machine, and meanwhile, the internal electromechanical auxiliary heat is started, so that the indoor heat supply amount is increased; the refrigerant enters the first throttling device 4 after passing through the inner machine heat exchanger, at the moment, the throttling function of the throttling device is weakened, the refrigerant returns to the air suction port of the compressor after passing through the first throttling device 4, the second throttling device 5, the second outer machine heat exchanger, the three-way valve 10, the refrigerant heating device 12 and the four-way valve 2 in sequence, and the first and second outer machine heat exchangers connected in series are defrosted respectively.
During the heating period of the heat pump air-conditioning system, a refrigerant enters the indoor heat exchanger 3 after coming out of an exhaust port of the compressor 1, enters the first throttling device 4 after passing through the indoor heat exchanger 3, enters the main heat exchanger 6 to exchange heat with outside air after being throttled, passes through the second throttling device 5, enters the defrosting heat exchanger 7 to exchange heat with the outside air after being throttled for the second time, and returns to an air suction port of the compressor 1 through the four-way valve, so that a heating cycle of the refrigerant is completed. Since the refrigerant entering the defrosting heat exchanger 7 is throttled twice by the first and second throttling devices 4 and 5, the temperature of the refrigerant entering the defrosting heat exchanger 7 becomes lower, so that the air can be dehumidified, and the air passing through the main heat exchanger 6 is drier, so that the frost layer is mainly distributed on the defrosting heat exchanger 7, and the main heat exchanger 6 has almost no frost layer.
The control method further comprises the following steps: when the heat pump air-conditioning system is in a defrosting condition, acquiring the frosting conditions of the main heat exchanger 6 and the defrosting heat exchanger 7; and adjusting the communication condition of the defrosting pipeline according to the frosting conditions of the main heat exchanger 6 and the defrosting heat exchanger 7.
The step of adjusting the communication condition of the defrosting pipeline according to the frosting condition of the main heat exchanger 6 and the defrosting heat exchanger 7 comprises the following steps: when the main heat exchanger 6 is not frosted and the defrosting heat exchanger 7 is frosted, the defrosting pipeline is controlled to be disconnected with the four-way valve 2 and communicated with the bypass pipeline 9; the refrigerant is controlled to flow out of the compressor 1 and then divided into two paths, wherein one path of the refrigerant enters the main heat exchanger 6 after passing through the indoor heat exchanger 3 and the first throttling device 4, and then flows back to the compressor 1 through the branch pipeline; the other path enters the branch pipeline after passing through a bypass pipeline 9, the defrosting heat exchanger 7 and the second throttling device 5, and then flows back to the compressor 1.
The step of adjusting the communication condition of the defrosting pipeline according to the frosting condition of the main heat exchanger 6 and the defrosting heat exchanger 7 comprises the following steps: when the main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, controlling the defrosting pipeline to be communicated with the four-way valve 2 and disconnected with the bypass pipeline 9; controlling the first throttling device 4 and the second throttling device 5 to be at the maximum opening degree; the control refrigerant flows out of the compressor 1, then enters the indoor heat exchanger 3 through the four-way valve 2, and then flows back to the compressor 1 through the main heat exchanger 6 and the defrosting heat exchanger 7 in sequence.
The step of adjusting the communication condition of the defrosting pipeline according to the frosting condition of the main heat exchanger 6 and the defrosting heat exchanger 7 further comprises the following steps: turning on the electric auxiliary heater 8; detecting the tube temperature of the indoor heat exchanger 3; when the pipe temperature of the indoor heat exchanger 3 is greater than T, controlling the opening of the inner fan; and when the pipe temperature of the indoor heat exchanger 3 is less than or equal to T, controlling the inner fan to be closed.
In the application, the heat pump air conditioning system has two defrosting modes, namely bypass flow diversion defrosting, hot air defrosting and the implementation and operation of the two defrosting modes are judged by the pipe temperature of the outdoor heat exchanger.
When the main heat exchanger 6 does not frost and a frost layer is only distributed on the defrosting heat exchanger 7, a bypass flow-dividing defrosting mode is adopted, the compressor 1 continuously operates during defrosting, the four-way valve 2 does not change direction, a refrigerant is divided into two paths after coming out of an exhaust port of the compressor 1, and one path enters a branch pipeline through the indoor heat exchanger 3, the first throttling device 4 and the main heat exchanger 6; the other path enters a branch pipeline after passing through a three-way valve 10, a defrosting heat exchanger 7 and a second throttling device 5, and two paths of refrigerants are converged and then return to a suction port of the compressor 1 through a four-way valve 2, so that one circulation of the refrigerants during defrosting is completed. Meanwhile, during defrosting, one path of refrigerant from the compressor 1 passes through the indoor heat exchanger 3 to continuously supply heat to the indoor, and meanwhile, the internal electromechanical auxiliary heat 8 is started to increase the indoor heat supply; the other path is used for defrosting the outer unit through the three-way valve 10 to the defrosting heat exchanger 7, the system controls the rotation or stop of the inner fan and the outer fan according to the frosting condition of the outer unit during defrosting, continuous heat supply to the indoor space is realized while the outer unit is defrosted, and indoor comfort during defrosting is improved.
The main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, when the main heat exchanger 6 is frosted slightly, a hot defrosting mode is adopted, the compressor 1 is continuously operated during defrosting, the four-way valve 2 is not reversed, the refrigerant is not shunted after coming out of an exhaust port of the compressor 1, the refrigerant continuously supplies heat to the indoor through the indoor heat exchanger 3, and meanwhile, the internal electromechanical auxiliary heat is started, so that the indoor heat supply amount is increased; the refrigerant enters the first throttling device 4 after passing through the indoor heat exchanger 3, the throttling function of the throttling device is weakened at the moment, the refrigerant enters the main heat exchanger 6 for defrosting and enters the second throttling device 5 and the defrosting heat exchanger 7 for defrosting in sequence after coming out of the first throttling device 4, the refrigerant coming out of the defrosting heat exchanger 7 returns to an air suction port of the compressor 1 through the four-way valve 2, and one cycle of the refrigerant is completed.
During this period, in order to guarantee indoor temperature's stability and travelling comfort, can utilize electricity to assist heat 8 for indoor heat supply, utilize interior fan to regulate and control indoor temperature simultaneously. During defrosting by using the mode, the indoor heat exchanger 3, the main heat exchanger 6 and the defrosting heat exchanger 7 all release heat outwards, and defrosting heat of the main heat exchanger 6 and the defrosting heat exchanger 7 needs to be provided at the same time, so that heat which can be supplied to the indoor heat exchanger 3 is unstable, and fluctuation of indoor temperature is easily caused due to the influence of electric auxiliary heat, therefore, in the process, the indoor temperature needs to be regulated and controlled by the inner fan, and fluctuation of the indoor temperature in the defrosting process of the outdoor heat exchanger is reduced. Specifically, in the application, the temperature of the electric auxiliary heater 8 can be constant, the pipe temperature of the indoor heat exchanger 3 can be detected at the moment, when the pipe temperature of the indoor heat exchanger 3 is greater than T, the inner fan is controlled to be started, and the fan can be used for diffusing the heat at the indoor heat exchanger 3 at the moment, so that the indoor temperature is diffused, and the problem that the indoor temperature is uneven due to overhigh local temperature of the indoor heat exchanger 3 is solved; when the pipe temperature of indoor heat exchanger 3 is less than or equal to T, then control interior fan and close, avoid the air diffusion of the lower temperature that indoor heat exchanger 3 department gived off to other places indoor, cause the problem that the temperature of other places indoor is less than the settlement temperature, improve the travelling comfort of indoor temperature, and then indoor heat exchanger 3 causes the undulant too big problem of indoor temperature when also effectively having avoided the steam defrosting mode, improve the comfort level that heat pump air conditioning system used.
The defrosting method is characterized in that the main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, when the frost layer of the main heat exchanger 6 is thick, a four-way valve reversing defrosting mode is adopted, the compressor 1 is stopped during defrosting, the four-way valve 2 is reversed, a refrigerant flows out from an exhaust port of the compressor 1 and then sequentially enters the defrosting heat exchanger 7 and the main heat exchanger 6 through the four-way valve 2 to be defrosted, and after the refrigerant flows out, the refrigerant flows back to the compressor 1 through the first throttling device 4, the indoor heat exchanger 3 and the four-way valve 2, and a cycle of the refrigerant is completed. In this process, the second throttling device 5 may be in a fully open state, so as to avoid throttling the refrigerant flowing out of the defrosting heat exchanger 7, thereby reducing the heat absorption capacity of the refrigerant in the room and improving the comfort level of the indoor temperature. In order to ensure the stable comfort of the indoor temperature, the electric auxiliary heater 8 can be turned on during defrosting to perform auxiliary heating indoors, meanwhile, the heat required by outdoor defrosting is provided by the electric auxiliary heater, and the influence on the indoor environment temperature is reduced. In order to further reduce the influence on the indoor environment temperature in the process, the inner fan can be also closed, so that the heat absorption temperature mainly comes from the electric auxiliary heat 8, the influence of the heat absorption temperature on the indoor air temperature on the peripheral side of the indoor heat exchanger 3 is reduced, and the comfort of the indoor temperature is ensured.
Preferably, the first and second electrodes are formed of a metal,
when the refrigerant heating device 12 is disposed on the exhaust pipe of the compressor: when the main heat exchanger 6 is not frosted and the defrosting heat exchanger 7 is frosted, the refrigerant heating device 12 is started to heat the compressor exhaust refrigerant; when the main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, the refrigerant heating device 12 is started to heat the compressor exhaust refrigerant;
when the refrigerant heating device 12 is disposed on the air suction pipeline of the compressor: when the main heat exchanger 6 is not frosted and the defrosting heat exchanger 7 is frosted, the refrigerant heating device 12 is started to heat the suction refrigerant of the compressor; when the main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, the refrigerant heating device 12 is started to heat the suction refrigerant of the compressor;
when the refrigerant heating device 12 is disposed on the defrosting pipe: when the main heat exchanger 6 is not frosted and the defrosting heat exchanger 7 is frosted, the refrigerant heating device 12 is started to heat the refrigerant in the defrosting pipeline; when the main heat exchanger 6 and the defrosting heat exchanger 7 are frosted, the refrigerant heating device 12 is started to heat the refrigerant in the defrosting pipeline.
Referring to fig. 3 to 4, the second embodiment of the present application is basically the same as the first embodiment in terms of the basic structure and control method, except that in this embodiment, the refrigerant heating device is disposed on the suction pipe of the compressor 1.
Second embodiment: the second embodiment of the present invention is to install the refrigerant heating device of the first embodiment on the loop of the compressor suction port. Under the low-temperature working condition, when the heat pump air conditioner is in heating operation, the refrigerant heating device is started through the control of the system to improve the suction temperature and the exhaust temperature of the compressor so as to achieve the effects of inhibiting frosting and prolonging the heating time, and the circulation of the heating system is shown in fig. 3. During defrosting, when the heat pump air conditioner is running, the refrigerant heating device is turned on to raise the suction temperature and the exhaust temperature of the compressor, the high-temperature gas can accelerate the defrosting speed of the outdoor unit, and two defrosting modes are available in the same scheme of system circulation during defrosting, as shown in fig. 4.
The third embodiment: in a third embodiment of the present invention, the refrigerant heating apparatus of the first embodiment is disposed on a pipeline between the second outdoor unit heat exchanger (i.e., the defrosting heat exchanger 7) and the three-way valve. Under the low-temperature working condition, when the heat pump air conditioner is in heating operation, the refrigerant heating device is started through the control of the system, so that the suction temperature and the exhaust temperature of the compressor are increased, the effects of inhibiting frosting and prolonging the heating time are achieved, and the system circulation is shown in fig. 7. During defrosting, when the heat pump air conditioner operates, refrigerant coming out of the compressor passes through the second outer machine heat exchanger after being heated by the refrigerant heating device, high-temperature gas can accelerate defrosting speed of the outdoor machine, indoor comfort during defrosting is guaranteed, performance of the heat pump is improved, and two defrosting modes are available for system circulation in the defrosting period in the same scheme, as shown in fig. 6.
In the above embodiments of the present application, the forms of the first throttling means 4 and the second throttling means 5 are not limited, and may be capillary throttling, short throttling, electronic expansion valve throttling, etc., and the first throttling means 4 and the second throttling means 5 may be combined using different throttling means, or may be the same throttling means. The three-way valve in this scheme is not limited in form and two-way valves may be used instead.
Preferably, the first throttling device 4 and the second throttling device 5 in the present application are both throttling devices with adjustable opening degrees, such as electronic expansion valves, so as to facilitate selection of a control mode more suitable for operation of the heat pump air conditioning system through opening degree adjustment.
The form of outdoor heat exchanger in this application scheme is not restricted, can be tube fin heat exchanger, also can be microchannel heat exchanger etc. specifically selects according to the in service behavior.
It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.
Claims (9)
1. The heat pump air-conditioning system is characterized by comprising a compressor (1), a four-way valve (2), an indoor heat exchanger (3), a first throttling device (4), an outdoor heat exchanger and a second throttling device (5), wherein the first throttling device (4) is positioned on a pipeline between the indoor heat exchanger (3) and the outdoor heat exchanger, the outdoor heat exchanger comprises a main heat exchanger (6) and a defrosting heat exchanger (7), the defrosting heat exchanger (7) is positioned on the upstream side of the air flowing of the main heat exchanger (6), the second throttling device (5) is connected with the defrosting heat exchanger (7) in series to form a defrosting pipeline, the defrosting pipeline can be selectively connected with the main heat exchanger (6) in series, and when the heat pump air-conditioning system is in a heating working condition, a refrigerant passes through the indoor heat exchanger (3) from an exhaust port of the compressor (1) and then passes through the indoor heat exchanger (3), The first throttling device (4) and the main heat exchanger (6) are throttled by a second throttling device (5), and then enter the defrosting heat exchanger (7) after being throttled by the second throttling device (5), and then flow back to the compressor (1); at least one of an exhaust pipeline, an air suction pipeline and the defrosting pipeline of the compressor (1) is provided with a refrigerant heating device (12); a branch pipeline is further connected between the main heat exchanger (6) and the second throttling device (5), the branch pipeline can be connected to a suction end of the compressor (1) through the four-way valve (2), a two-way valve (11) is further arranged on the branch pipeline, an exhaust port of the compressor (1) is connected with the four-way valve (2), an exhaust port of the compressor (1) is further provided with a bypass pipeline (9), and the defrosting pipeline can be selectively communicated with the four-way valve (2) or the bypass pipeline (9); the first throttling device (4) is a capillary tube, a throttling short tube or an electronic expansion valve, and the second throttling device (5) is a capillary tube, a throttling short tube or an electronic expansion valve; the outdoor heat exchanger is a tube fin type heat exchanger or a micro-channel heat exchanger.
2. Heat pump air conditioning system according to claim 1, characterized in that an electric auxiliary heat (8) is provided at the indoor heat exchanger (3); and/or an inner fan is arranged at the indoor heat exchanger (3).
3. The heat pump air conditioning system according to claim 1, further comprising a three-way valve (10), the defrost line, the bypass line (9), and the four-way valve (2) all being connected to the three-way valve (10).
4. A control method of a heat pump air conditioning system according to any one of claims 1 to 3, characterized by comprising:
acquiring the operation condition of a heat pump air conditioning system;
when the heat pump air-conditioning system is in a heating working condition, the refrigerant is controlled to flow through the indoor heat exchanger (3), the first throttling device (4) and the main heat exchanger (6) from the exhaust port of the compressor (1), then flow through the second throttling device (5) for throttling, flow through the second throttling device (5), then flow into the defrosting heat exchanger (7), and then flow back to the compressor (1).
5. The control method of the heat pump air conditioning system according to claim 4, characterized by further comprising:
when the heat pump air-conditioning system is in a defrosting condition, acquiring frosting conditions of the main heat exchanger (6) and the defrosting heat exchanger (7);
and adjusting the communication condition of the defrosting pipeline according to the frosting conditions of the main heat exchanger (6) and the defrosting heat exchanger (7).
6. The control method of the heat pump air conditioning system according to claim 5, wherein the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger (6) and the defrosting heat exchanger (7) comprises:
when the main heat exchanger (6) is not frosted and the defrosting heat exchanger (7) is frosted, and when a branch pipeline is connected between the main heat exchanger (6) and the second throttling device (5), the branch pipeline can be connected to the air suction end of the compressor (1) through the four-way valve (2), and when a two-way valve (11) is further arranged on the branch pipeline, the defrosting pipeline is controlled to be communicated with the bypass pipeline (9), and meanwhile the two-way valve (11) is controlled to be opened;
the refrigerant is controlled to flow out of the compressor (1) and then is divided into two paths, wherein one path of the refrigerant enters the main heat exchanger (6) after passing through the indoor heat exchanger (3) and the first throttling device (4), and then flows back to the compressor (1) through the branch pipeline;
the other path enters the branch pipeline after passing through a bypass pipeline (9), the defrosting heat exchanger (7) and the second throttling device (5) and then flows back to the compressor (1).
7. The control method of the heat pump air conditioning system according to claim 5, wherein the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger (6) and the defrosting heat exchanger (7) comprises:
when the main heat exchanger (6) and the defrosting heat exchanger (7) are frosted, controlling the defrosting pipeline to be communicated with the four-way valve (2) and disconnected with the bypass pipeline (9), and controlling the two-way valve (11) to close and close the branch pipeline;
controlling the first throttling device (4) and the second throttling device (5) to be in the maximum opening degree;
the refrigerant is controlled to flow out of the compressor (1), then enters the indoor heat exchanger (3) through the four-way valve (2), and then flows back to the compressor (1) through the main heat exchanger (6) and the defrosting heat exchanger (7) in sequence.
8. The control method of the heat pump air conditioning system according to claim 7, wherein the step of adjusting the communication condition of the defrosting pipe according to the frosting condition of the main heat exchanger (6) and the defrosting heat exchanger (7) further comprises:
turning on the electric auxiliary heater (8);
detecting the tube temperature of the indoor heat exchanger (3);
when the pipe temperature of the indoor heat exchanger (3) is greater than T, controlling the inner fan to be started;
and when the pipe temperature of the indoor heat exchanger (3) is less than or equal to T, controlling the inner fan to be closed.
9. The control method of the heat pump air conditioning system according to any one of claims 6 to 8,
when the refrigerant heating device (12) is arranged on the exhaust pipeline of the compressor: when the main heat exchanger (6) is not frosted and the defrosting heat exchanger (7) is frosted, the refrigerant heating device (12) is started to heat the exhaust refrigerant of the compressor; when the main heat exchanger (6) and the defrosting heat exchanger (7) are frosted, the refrigerant heating device (12) is started to heat the compressor exhaust refrigerant;
when the refrigerant heating device (12) is arranged on the air suction pipeline of the compressor: when the main heat exchanger (6) is not frosted and the defrosting heat exchanger (7) is frosted, the refrigerant heating device (12) is started to heat the air suction refrigerant of the compressor; when the main heat exchanger (6) and the defrosting heat exchanger (7) are frosted, the refrigerant heating device (12) is started to heat the air suction refrigerant of the compressor;
when the refrigerant heating device (12) is arranged on the defrosting pipeline: when the main heat exchanger (6) is not frosted and the defrosting heat exchanger (7) is frosted, the refrigerant heating device (12) is started to heat the refrigerant in the defrosting pipeline; and when the main heat exchanger (6) and the defrosting heat exchanger (7) are frosted, the refrigerant heating device (12) is started to heat the refrigerant in the defrosting pipeline.
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| CN113108498B (en) * | 2020-03-09 | 2022-05-10 | 珠海格力电器股份有限公司 | Heat pump air conditioning system and control method thereof |
| CN114110929A (en) * | 2021-11-12 | 2022-03-01 | 珠海格力电器股份有限公司 | Defrosting control method of air conditioner and air conditioner using same |
| CN114234503A (en) * | 2021-12-20 | 2022-03-25 | 珠海格力电器股份有限公司 | Defrosting assembly, control method thereof and air conditioning system |
| CN114777214A (en) * | 2022-04-12 | 2022-07-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Heat pump air conditioning system and control method thereof |
| CN115371311A (en) * | 2022-08-16 | 2022-11-22 | 西安交通大学 | Parasitic heat exchanger system with frost inhibition and defrosting functions and working method |
| CN115614926A (en) * | 2022-10-17 | 2023-01-17 | 珠海格力电器股份有限公司 | Control method and device of air conditioner, air conditioner and storage medium |
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