CN107560218B - Multi-split air conditioning system and defrosting control method thereof - Google Patents
Multi-split air conditioning system and defrosting control method thereof Download PDFInfo
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- CN107560218B CN107560218B CN201710825458.4A CN201710825458A CN107560218B CN 107560218 B CN107560218 B CN 107560218B CN 201710825458 A CN201710825458 A CN 201710825458A CN 107560218 B CN107560218 B CN 107560218B
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Abstract
The invention discloses a multi-split system and a defrosting control method thereof, wherein the multi-split system comprises a first anti-freezing component, a second anti-freezing component and an anti-freezing electric control valve which is respectively connected with inlets of the first anti-freezing component and the second anti-freezing component, and the method comprises the following steps: when the multi-online system is in heating operation, controlling the multi-online system to be switched from a heating operation mode to a defrosting operation mode according to the received defrosting instruction; after the defrosting operation mode is switched to, defrosting the second outdoor heat exchanger, and controlling the anti-freezing electric control valve to be opened so as to heat defrosting water generated by the second outdoor heat exchanger at the second anti-freezing assembly and preheat the first anti-freezing assembly; when the preset condition is met, switching to defrosting the first outdoor heat exchanger, controlling the anti-freezing electric control valve to be closed, and acquiring the outlet temperature of the first outdoor heat exchanger; and controlling the anti-freezing electric control valve to be opened or to be maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a defrosting control method of a multi-split air conditioner system, a non-temporary computer-readable storage medium and the multi-split air conditioner system.
Background
At present, when the multi-split air-conditioning system operates in a heating mode in winter, because the external environment temperature of the outdoor unit is low, the outdoor heat exchanger may frost, the heat exchange effect of the outdoor heat exchanger and a refrigerant is seriously affected, and the normal operation of the multi-split air-conditioning system is affected. Therefore, in order to ensure the safe and normal operation of the multi-split system, the multi-split system needs to defrost the outdoor heat exchanger.
The refrigerant pipeline of the outdoor heat exchanger of the multi-split air-conditioning system in the related art mostly adopts a single-loop channel, namely only one channel can enable the refrigerant to enter or flow out of the outdoor heat exchanger, however, because each branch pipeline is relatively long, the temperature of the refrigerant flowing along the pipeline can be continuously reduced, defrosting water also exists on the outer wall of the pipeline for absorbing heat, and the temperature of the refrigerant flowing into the outdoor heat exchanger is low, so that the defrosting efficiency of the outdoor heat exchanger is low.
In addition, the two-pipe heat recovery multi-split system is a commonly used heat recovery multi-split system. In the defrosting process of the two-pipe type heat recovery multi-split air-conditioning system, due to the low external environment temperature, defrosting water may flow onto a chassis of the outdoor unit along the outdoor heat exchanger and be condensed into ice again, so that a drain hole is blocked, and the normal operation of the multi-split air-conditioning system is affected.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, an object of the present invention is to provide a defrosting control method for a multi-split air-conditioning system, which can improve defrosting efficiency of an outdoor heat exchanger, and can prevent defrosting water generated by the outdoor heat exchanger from being secondarily frozen, thereby ensuring smooth drainage of a drain hole and ensuring normal operation of the multi-split air-conditioning system.
A second object of the invention is to propose a non-transitory computer-readable storage medium.
A third object of the present invention is to provide a multi-split system.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a defrosting control method for a multi-split air conditioning system, where an outdoor unit of the multi-split air conditioning system includes a compressor, a four-way valve, an anti-freezing electric control valve, a first outdoor heat exchanger, a first anti-freezing assembly arranged corresponding to the first outdoor heat exchanger, a second outdoor heat exchanger, and a second anti-freezing assembly arranged corresponding to the second outdoor heat exchanger, where a first port of the four-way valve is connected to an outlet of the compressor, a second port of the four-way valve is connected to an inlet of the first outdoor heat exchanger through a first electric control valve set and is connected to an inlet of the second outdoor heat exchanger through a second electric control valve set, one end of the anti-freezing electric control valve is connected to the outlet of the compressor, and the other end of the anti-freezing electric control valve is connected to an inlet of the first anti-freezing assembly and an inlet of the second anti, an outlet of the second outdoor heat exchanger is communicated with an outlet of the second anti-freezing assembly, and the defrosting control method comprises the following steps: when the multi-split air conditioning system is in heating operation, controlling a first port and a second port of the four-way valve to be communicated according to a received defrosting instruction so as to control the multi-split air conditioning system to be switched from a heating operation mode to a defrosting operation mode; after the multi-split system is switched to a defrosting operation mode, the second electric control valve group is controlled to be opened, and the first electric control valve group is controlled to be closed, so that defrosting is carried out on the second outdoor heat exchanger; when the second outdoor heat exchanger is defrosted, the anti-freezing electric control valve is controlled to be opened so as to heat defrosting water generated by the second outdoor heat exchanger at the second anti-freezing component and preheat the first anti-freezing component; when a preset condition is met, the first electric control valve group is controlled to be opened, the second electric control valve group is controlled to be closed, and defrosting of the first outdoor heat exchanger is switched; when the defrosting of the first outdoor heat exchanger is switched to, controlling the anti-freezing electric control valve to be closed, and acquiring the outlet temperature of the first outdoor heat exchanger; and controlling the anti-freezing electric control valve to be opened or to be maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger.
According to the defrosting control method of the multi-split air conditioning system, when the multi-split air conditioning system is operated for heating, the multi-split air conditioning system can be controlled to switch from the heating operation mode to the defrosting operation mode according to the received defrosting instruction, after the multi-split air conditioning system is switched to the defrosting operation mode, the second outdoor heat exchanger can be defrosted, the anti-freezing electric control valve is controlled to be opened so as to heat defrosting water generated by the second outdoor heat exchanger at the second anti-freezing component and preheat the first anti-freezing component, when the preset condition is met, the defrosting operation can be switched to the defrosting operation of the first outdoor heat exchanger, the anti-freezing electric control valve is controlled to be closed, the outlet temperature of the first outdoor heat exchanger is obtained, the anti-freezing electric control valve is controlled to be opened or kept in a closed state according to the outlet temperature of the first outdoor heat exchanger, and therefore, the on-off state of the anti-freezing electromagnetic valve is reasonably controlled, the defrosting efficiency of the outdoor heat exchanger can be improved, and the defrosting water generated by the outdoor heat exchanger can be prevented from being frozen for the second time, so that the drainage of the drain hole is ensured to be smooth, and the normal operation of the multi-split air-conditioning system is ensured.
In addition, the defrosting control method of the multi-split air-conditioning system according to the above embodiment of the present invention may further have the following additional technical features:
in one embodiment of the present invention, controlling the anti-freezing electrically controlled valve to be opened or to be maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger includes: judging whether the outlet temperature of the first outdoor heat exchanger is greater than or equal to a first preset temperature or not; if the outlet temperature of the first outdoor heat exchanger is greater than or equal to the first preset temperature, controlling the anti-freezing electric control valve to be opened; and if the outlet temperature of the first outdoor heat exchanger is lower than the first preset temperature, controlling the anti-freezing electric control valve to maintain a closed state.
In one embodiment of the invention, during the switching process of the multi-split air-conditioning system from the defrosting operation mode to the heating operation mode, the anti-freezing electrically-controlled valve is controlled to be opened so as to heat the defrosting water generated by the first outdoor heat exchanger at the first anti-freezing assembly and the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing assembly.
And further, after the multi-split system is switched back to the heating operation mode, the anti-freezing electric control valve is controlled according to the outdoor environment temperature.
In an embodiment of the present invention, the anti-freezing electric control valve, the electric control valve in the first electric control valve group, and the electric control valve in the second electric control valve group are all one-way solenoid valves.
To achieve the above object, a non-transitory computer-readable storage medium is provided in a second embodiment of the present invention, and a computer program is stored thereon, where the program, when executed by a processor, implements the defrosting control method of the multi-split air-conditioning system provided in the first embodiment of the present invention.
According to the non-transitory computer readable storage medium provided by the embodiment of the invention, the on-off state of the anti-freezing electromagnetic valve is reasonably controlled, the defrosting efficiency of the outdoor heat exchanger can be improved, and the secondary freezing of defrosting water generated by the outdoor heat exchanger can be prevented, so that the smooth drainage of the drain hole is ensured, and the normal operation of a multi-split air-conditioning system is ensured.
In order to achieve the above object, a third aspect of the present invention provides a multi-split system, including: the outdoor unit comprises a compressor, a four-way valve, an anti-freezing electric control valve, a first outdoor heat exchanger, a first anti-freezing assembly arranged corresponding to the first outdoor heat exchanger, a second outdoor heat exchanger and a second anti-freezing assembly arranged corresponding to the second outdoor heat exchanger, wherein a first port of the four-way valve is connected with an outlet of the compressor, a second port of the four-way valve is connected to an inlet of the first outdoor heat exchanger through a first electric control valve group and is connected to an inlet of the second outdoor heat exchanger through a second electric control valve group, one end of the anti-freezing electric control valve is connected with an outlet of the compressor, the other end of the anti-freezing electric control valve is respectively connected with the inlet of the first anti-freezing assembly and the inlet of the second anti-freezing assembly, and an outlet of the second outdoor heat exchanger is communicated with an outlet of the second anti-freezing assembly, and a controller for: when the multi-split air conditioning system is in heating operation, controlling a first port and a second port of the four-way valve to be communicated according to a received defrosting instruction so as to control the multi-split air conditioning system to be switched from a heating operation mode to a defrosting operation mode; after the multi-split system is switched to a defrosting operation mode, the second electric control valve group is controlled to be opened, and the first electric control valve group is controlled to be closed, so that defrosting is carried out on the second outdoor heat exchanger; when the second outdoor heat exchanger is defrosted, the anti-freezing electric control valve is controlled to be opened so as to heat defrosting water generated by the second outdoor heat exchanger at the second anti-freezing component and preheat the first anti-freezing component; when a preset condition is met, the first electric control valve group is controlled to be opened, the second electric control valve group is controlled to be closed, and defrosting of the first outdoor heat exchanger is switched; when the defrosting of the first outdoor heat exchanger is switched to, controlling the anti-freezing electric control valve to be closed, and acquiring the outlet temperature of the first outdoor heat exchanger; and controlling the anti-freezing electric control valve to be opened or to be maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger.
According to the multi-split system of the embodiment of the invention, when the multi-split system is operated for heating, the controller may control the multi-split system to switch from the heating operation mode to the defrosting operation mode according to the received defrosting instruction, may defrost the second outdoor heat exchanger after the multi-split system is switched to the defrosting operation mode, may control the anti-freezing electrically controlled valve to open to heat the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing assembly and preheat the first anti-freezing assembly, may switch to defrost the first outdoor heat exchanger when a preset condition is met, may control the anti-freezing electrically controlled valve to close and obtain the outlet temperature of the first outdoor heat exchanger, and may control the anti-freezing electrically controlled valve to open or maintain a closed state according to the outlet temperature of the first outdoor heat exchanger, thereby, by reasonably controlling the on-off state of the anti-freezing solenoid valve, the defrosting efficiency of the outdoor heat exchanger can be improved, and the defrosting water generated by the outdoor heat exchanger can be prevented from being frozen for the second time, so that the drainage of the drain hole is ensured to be smooth, and the normal operation of the multi-split air-conditioning system is ensured.
In addition, the multi-split system proposed according to the above embodiment of the present invention may further have the following additional technical features:
in an embodiment of the present invention, the controller is configured to determine whether the outlet temperature of the first outdoor heat exchanger is greater than or equal to a first preset temperature, and control the anti-freezing electrically controlled valve to open when the outlet temperature of the first outdoor heat exchanger is greater than or equal to the first preset temperature, and control the anti-freezing electrically controlled valve to maintain a closed state when the outlet temperature of the first outdoor heat exchanger is less than the first preset temperature.
In an embodiment of the invention, the controller controls the anti-freezing electrically-controlled valve to open to heat the defrosting water generated by the first outdoor heat exchanger at the first anti-freezing assembly and the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing assembly during the process of switching the multi-split air-conditioning system from the defrosting operation mode to the heating operation mode.
Further, the controller controls the anti-freezing electric control valve according to the outdoor environment temperature after the multi-split air conditioning system is switched back to the heating operation mode.
In an embodiment of the present invention, the anti-freezing electric control valve, the electric control valve in the first electric control valve group, and the electric control valve in the second electric control valve group are all one-way solenoid valves.
Drawings
Fig. 1 is a schematic view illustrating an outdoor unit of a multi-split system according to an embodiment of the present invention;
fig. 2 is a flowchart of a defrost control method of a multi-split system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a multi-split system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A multi-split system and a defrosting control method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a schematic view illustrating an outdoor unit of a multi-split air conditioning system.
As shown in fig. 1, the outdoor unit 100 of the multi-split air-conditioning system includes a compressor 110, a four-way valve ST, an anti-freezing electric control valve SV1, a first outdoor heat exchanger 120, a first anti-freezing assembly 130 provided corresponding to the first outdoor heat exchanger 120, a second outdoor heat exchanger 140, a second anti-freezing assembly 150 provided corresponding to the second outdoor heat exchanger 140, wherein a first port a of the four-way valve ST is connected to an outlet HP of the compressor 110, a second port b of the four-way valve ST is connected to an inlet of the first outdoor heat exchanger 120 through a first electronic control valve group 160, and is connected to the inlet of the second outdoor heat exchanger 140 through a second electronic control valve group 170, one end of an anti-freezing electronic control valve SV1 is connected to the outlet HP of the compressor 110, the other end of the anti-freezing electronic control valve SV1 is connected to the inlet of the first anti-freezing assembly 130 and the inlet of the second anti-freezing assembly 150, respectively, and the outlet of the second outdoor heat exchanger 140 is communicated with the outlet of the second anti-freezing assembly 150.
In the outdoor unit 100 of the multi-split air conditioning system shown in fig. 1, two compressors 110 connected in parallel are included, outlets of the two compressors 110 connected in parallel are connected to a first end a of a four-way valve ST through an oil separator, and inlets LP of the two compressors 110 connected in parallel are connected to an outlet of a low pressure tank. Through setting up two compressors, can improve the operating load of multi-split system when two compressors move simultaneously to can improve the life of compressor when two compressor wheel value moves.
As shown in fig. 1, the first outdoor heat exchanger 120 may be divided into three parts, an upper part, a middle part and a lower part, and the first electronic valve set 160 may include an electronic control valve SV2, an electronic control valve SV3 and an electronic control valve SV4, wherein one end of the electronic control valve SV2, one end of the electronic control valve SV3 and one end of the electronic control valve SV4 are connected to each other and to the second port b of the four-way valve ST, and the other end of the electronic control valve SV4, the other end of the electronic control valve SV3 and the other end of the electronic control valve SV2 may be respectively connected to the three parts, the upper part, the middle part and the lower part, of the first outdoor heat exchanger 120, that is, the refrigerant may flow into the first outdoor heat exchanger 120 from a plurality. The second electrically controlled valve block 170 may comprise an electrically controlled valve SV5 and an electrically controlled valve SV6, and the electrically controlled valve SV5 and the electrically controlled valve SV6 are connected in parallel with each other. Wherein one ends of the electric control valve SV5 and the electric control valve SV6 are connected to the second port b of the four-way valve ST, and the other ends of the electric control valve SV5 and the electric control valve SV6 are connected to the inlet of the first outdoor heat exchanger 140, wherein the electric control valve SV5 and the electric valve SV6 are simultaneously opened or simultaneously closed.
Fig. 2 is a flowchart of a defrost control method of a multi-split system according to an embodiment of the present invention.
As shown in fig. 2, a defrosting control method of a multi-split air-conditioning system according to an embodiment of the present invention includes the following steps:
and S1, when the multi-split air conditioning system is in heating operation, controlling the first port and the second port of the four-way valve to be communicated according to the received defrosting instruction so as to control the multi-split air conditioning system to be switched from the heating operation mode to the defrosting operation mode.
That is, when the multi-split air-conditioning system operates in the heating mode, the first port and the second port of the four-way valve can be controlled to be communicated according to the received defrosting command, so that the high-temperature and high-pressure refrigerant discharged from the compressor can flow into the outdoor heat exchanger after passing through the four-way valve, and the outdoor heat exchanger is defrosted.
And S2, after the multi-split system is switched to the defrosting operation mode, the second electric control valve group is controlled to be opened, and the first electric control valve group is controlled to be closed, so that the second outdoor heat exchanger is defrosted. The electric control valves in the first electric control valve group and the second electric control valve group can be one-way electromagnetic valves.
Specifically, when the multi-split air conditioning system operates in a defrosting mode, the second electric control valve bank can be controlled to be opened, and the first electric control valve bank can be controlled to be closed, so that high-temperature and high-pressure refrigerant discharged from the compressor can flow into the second outdoor heat exchanger after passing through the four-way valve, and the second outdoor heat exchanger is defrosted.
And S3, when the second outdoor heat exchanger is defrosted, the anti-freezing electric control valve is controlled to be opened so as to heat the defrosted water generated by the second outdoor heat exchanger at the second anti-freezing component and preheat the first anti-freezing component. Wherein, the anti-freezing electric control valve can be a one-way electromagnetic valve.
When the anti-freezing electric control valve is controlled to be opened, high-temperature and high-pressure refrigerant discharged from the compressor can flow into the second anti-freezing component after passing through the oil separator, and is condensed in the second anti-freezing component and releases heat so as to heat defrosting water generated by a second outdoor heat exchanger at the second anti-freezing component; after passing through the oil separator, the high-temperature and high-pressure refrigerant discharged from the compressor can also flow into the first anti-freezing component, and is condensed in the first anti-freezing component and releases heat, so that the first anti-freezing component is preheated. The first anti-freezing component and the second anti-freezing component can be anti-freezing coil pipes respectively attached to the bottoms of the first outdoor heat exchanger and the second outdoor heat exchanger.
And S4, when the preset conditions are met, controlling the first electric control valve group to be opened and the second electric control valve group to be closed so as to switch to defrost the first outdoor heat exchanger.
The preset conditions may include a certain set time, a certain set temperature, and the like, and the temperature sensor and the timer which are provided at the outlet of the second outdoor heat exchanger may be used to obtain the outlet temperature of the second outdoor heat exchanger and the time for defrosting the second outdoor heat exchanger, respectively. When the defrosting time of the second outdoor heat exchanger is longer than a certain set time or the outlet temperature of the second outdoor heat exchanger is higher than a certain set temperature, the defrosting of the second outdoor heat exchanger achieves the expected effect, the first electric control valve group can be controlled to be opened, the second electric control valve group can be controlled to be closed, so that high-temperature and high-pressure refrigerant discharged from the compressor can flow into the first outdoor heat exchanger after passing through the four-way valve, and the first outdoor heat exchanger is defrosted.
And S5, when the defrosting mode is switched to the defrosting mode for the first outdoor heat exchanger, the anti-freezing electric control valve is controlled to be closed, and the outlet temperature of the first outdoor heat exchanger is obtained. The outlet temperature of the first outdoor heat exchanger can be obtained through a temperature sensor arranged at the outlet of the first outdoor heat exchanger.
In an embodiment of the present invention, when the multi-split air-conditioning system switches from defrosting the second outdoor heat exchanger to defrosting the first outdoor heat exchanger, since the outlet of the second outdoor heat exchanger is connected to the outlet of the second anti-freezing assembly, and a one-way solenoid valve is not provided before the outlet of the second outdoor heat exchanger is connected to the outlet of the second anti-freezing assembly, if the anti-freezing control valve is opened, a part of the high-temperature and high-pressure refrigerant discharged from the compressor after passing through the oil separator passes through the second anti-freezing assembly and is poured into the second outdoor heat exchanger, and is condensed in the second outdoor heat exchanger, the amount of the refrigerant flowing into the first outdoor heat exchanger is reduced, thereby reducing the efficiency of defrosting the first outdoor heat exchanger. Therefore, when the multi-split air-conditioning system is switched from defrosting the second outdoor heat exchanger to defrosting the first outdoor heat exchanger, the anti-freezing electric control valve can be controlled to be closed firstly, so that the quantity of the refrigerant flowing into the first outdoor heat exchanger is increased, and the defrosting efficiency of the first outdoor heat exchanger is ensured.
And S6, controlling the anti-freezing electric control valve to be opened or to be maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger.
Specifically, it may be determined whether the outlet temperature of the first outdoor heat exchanger is greater than or equal to a first preset temperature. If the outlet temperature of the first outdoor heat exchanger is greater than or equal to a first preset temperature, controlling the anti-freezing electric control valve to be opened; and if the outlet temperature of the first outdoor heat exchanger is lower than the first preset temperature, controlling the anti-freezing electric control valve to maintain a closed state. The first preset temperature can be calibrated according to actual conditions. It can be understood that the high-temperature and high-pressure refrigerant discharged from the compressor can flow into the first outdoor heat exchanger after passing through the four-way valve, and defrost the first outdoor heat exchanger, and at this time, the temperature of the refrigerant in the first outdoor heat exchanger is reduced, so that the outlet temperature of the first outdoor heat exchanger is low. As the high-temperature and high-pressure refrigerant discharged from the compressor continuously flows into the first outdoor heat exchanger, frost in the first outdoor heat exchanger is continuously reduced, the temperature of the refrigerant in the first outdoor heat exchanger is continuously increased, namely, the outlet temperature of the first outdoor heat exchanger can be continuously increased, when the outlet temperature of the first outdoor heat exchanger is more than or equal to the first preset temperature, the first outdoor heat exchanger is defrosted to achieve the expected effect, at the moment, the anti-freezing electric control valve can be controlled to be opened, so as to reheat the defrosting water generated by the first outdoor heat exchanger at the first anti-freezing component and prevent the defrosting water generated by the first outdoor heat exchanger from being frozen again, when the outlet temperature of the first outdoor heat exchanger is lower than a first preset temperature, and efficient defrosting is continuously carried out on the first outdoor heat exchanger, and at the moment, the anti-freezing electric control valve can be controlled to maintain a closed state.
In one embodiment of the present invention, during the switching of the multi-split air-conditioning system from the defrosting operation mode to the heating operation mode, the anti-freezing electrically controlled valve may be controlled to be opened to heat the defrosting water generated by the first outdoor heat exchanger at the first anti-freezing assembly and the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing assembly. That is to say, after the first outdoor heat exchanger and the second outdoor heat exchanger are defrosted respectively, the multi-split air conditioning system can control the first electric control valve group and the second electric control valve group to be opened, and the compressor starts to reduce the frequency to prepare for switching back to the heating operation mode. In the process, the anti-freezing electric control valve can be controlled to be opened, so that the high-temperature and high-pressure refrigerant discharged from the compressor can respectively flow into the first anti-freezing assembly and the second anti-freezing assembly after passing through the oil separator, and the defrosting water generated by the first outdoor heat exchanger at the first anti-freezing assembly and the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing assembly are heated again. Therefore, the defrosting water generated by the first outdoor heat exchanger at the first anti-freezing component and the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing component can be prevented from being frozen again.
In an embodiment of the present invention, after the multi-split air conditioning system is switched back to the heating operation mode, the anti-freezing electrically controlled valve may be controlled according to the outdoor ambient temperature.
Specifically, when the external environment temperature is higher than a certain value, if the multi-split air conditioning system is switched to the defrosting operation mode again, the temperature of the outdoor heat exchanger is relatively high, the defrosting efficiency of the outdoor heat exchanger is also high, and the probability of secondary icing of defrosting water generated by the outdoor heat exchanger is low, so that the anti-freezing electric control valve can be controlled to be closed. If the multi-split air-conditioning system continuously operates in a heating mode, the anti-freezing electric control valve can be controlled according to high-pressure protection logic, specifically, if the multi-split air-conditioning system enters high-pressure protection, the anti-freezing electric control valve can be controlled to be opened, and a part of high-temperature and high-pressure refrigerant discharged from the compressor directly flows into the low-pressure tank through the anti-freezing electric control valve, the first anti-freezing assembly and the second anti-freezing assembly after passing through the oil separator so as to realize pressure relief of the multi-split air-conditioning system, namely, the anti-freezing electric control valve can be used as a pressure relief valve; if the multi-split air conditioner system does not enter the high-pressure prevention protection, the anti-freezing electric control valve can be controlled to be closed.
When the external environment temperature is lower than a certain value, defrosting water possibly exists in the outdoor heat exchanger, and the anti-freezing electric control valve can be controlled to be opened for a period of time so as to heat the defrosting water generated by the first outdoor heat exchanger at the first anti-freezing component and the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing component again, so that the secondary icing of the defrosting water is prevented. After the anti-freezing electric control valve is opened for a period of time, the anti-freezing electric control valve can be controlled according to the high-pressure protection logic.
According to the defrosting control method of the multi-split air conditioning system, when the multi-split air conditioning system is operated for heating, the multi-split air conditioning system can be controlled to switch from the heating operation mode to the defrosting operation mode according to the received defrosting instruction, after the multi-split air conditioning system is switched to the defrosting operation mode, the second outdoor heat exchanger can be defrosted, the anti-freezing electric control valve is controlled to be opened so as to heat defrosting water generated by the second outdoor heat exchanger at the second anti-freezing component and preheat the first anti-freezing component, when the preset condition is met, the defrosting operation can be switched to the defrosting operation of the first outdoor heat exchanger, the anti-freezing electric control valve is controlled to be closed, the outlet temperature of the first outdoor heat exchanger is obtained, the anti-freezing electric control valve is controlled to be opened or kept in a closed state according to the outlet temperature of the first outdoor heat exchanger, and therefore, the on-off state of the anti-freezing electromagnetic valve is reasonably controlled, the defrosting efficiency of the outdoor heat exchanger can be improved, and the defrosting water generated by the outdoor heat exchanger can be prevented from being frozen for the second time, so that the drainage of the drain hole is ensured to be smooth, and the normal operation of the multi-split air-conditioning system is ensured.
The invention also provides a non-transitory computer readable storage medium corresponding to the above embodiment.
A non-transitory computer-readable storage medium of an embodiment of the present invention stores a computer program, where when the program is executed by a processor, the defrosting control method of a multi-split air-conditioning system proposed in the above-described embodiment of the present invention can be implemented.
According to the non-transitory computer readable storage medium of the embodiment of the invention, through executing the stored computer program, the defrosting efficiency of the outdoor heat exchanger can be effectively improved, and the secondary icing of the defrosting water generated by the outdoor heat exchanger can be prevented, so that the smooth drainage of the drain hole is ensured, and the normal operation of the multi-split air-conditioning system is ensured.
The invention further provides a multi-split system corresponding to the embodiment.
As shown in fig. 3, the multi-split system according to the embodiment of the present invention includes an outdoor unit 100 and a controller 200.
The controller 200 is configured to control the first port a and the second port b of the four-way valve ST to be communicated according to a received defrosting instruction when the multi-split air conditioning system is in heating operation, so as to control the multi-split air conditioning system to switch from a heating operation mode to a defrosting operation mode; after the multi-split air conditioning system is switched to the defrosting operation mode, the second electric control valve group 170 is controlled to be opened, and the first electric control valve group 160 is controlled to be closed, so that the second outdoor heat exchanger 140 is defrosted; when the second outdoor heat exchanger 140 is defrosted, the anti-freezing electric control valve SV1 is controlled to be opened so as to heat the defrosted water generated by the second outdoor heat exchanger at the second anti-freezing assembly 150 and preheat the first anti-freezing assembly 130; when the preset conditions are met, the first electric control valve group 160 is controlled to be opened, the second electric control valve group 170 is controlled to be closed, and defrosting of the first outdoor heat exchanger 120 is switched; when the defrosting of the first outdoor heat exchanger 120 is switched to, the anti-freezing electric control valve SV1 is controlled to be closed, and the outlet temperature of the first outdoor heat exchanger 120 is obtained; and controlling the anti-freezing electric control valve SV1 to be opened or maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger 120.
In an embodiment of the present invention, when the multi-split system operates in the heating mode, the controller 200 controls the first port a and the second port b of the four-way valve to communicate with each other according to the received defrosting command, so that the high-temperature and high-pressure refrigerant discharged from the compressor 110 may flow into the outdoor heat exchanger after passing through the four-way valve ST, and defrost the outdoor heat exchanger.
Further, when the multi-split air-conditioning system operates in the defrosting mode, the controller 200 may control the second electronic valve set 170 to be opened and the first electronic valve set 160 to be closed, so that the high-temperature and high-pressure refrigerant discharged from the compressor 110 may flow into the second outdoor heat exchanger 140 after passing through the four-way valve ST, and defrost the second outdoor heat exchanger 140.
In one embodiment of the present invention, the freeze protection solenoid valve SV1, the solenoid valves in the first electronic control valve group 160, and the solenoid valves in the second electronic control valve group 170 are all one-way solenoid valves.
It can be understood that when the controller 200 controls the anti-freezing electrically controlled valve SV1 to be opened, the refrigerant with high temperature and high pressure discharged from the compressor can flow into the second anti-freezing assembly 150 after passing through the oil separator, condense and release heat in the second anti-freezing assembly 150, so as to heat the defrosting water generated by the second outdoor heat exchanger 140 at the second anti-freezing assembly 150; the high-temperature and high-pressure refrigerant discharged from the compressor 110 may flow into the first anti-freezing assembly 130 after passing through the oil separator, and be condensed in the first anti-freezing assembly 130 to release heat, so as to preheat the first anti-freezing assembly 130. Wherein the first and second anti-freeze assemblies 130 and 150 may be anti-freeze coils attached to the bottoms of the first and second outdoor heat exchangers 120 and 140, respectively.
In an embodiment of the present invention, the preset condition may include a certain set time, a certain set temperature, and the like, and the outlet temperature of the second outdoor heat exchanger 140 and the time for defrosting the second outdoor heat exchanger 140 may be respectively acquired by a temperature sensor and a timer provided at the outlet of the second outdoor heat exchanger 140. When the time for defrosting the second outdoor heat exchanger 140 is longer than a certain set time or the outlet temperature of the second outdoor heat exchanger 140 is higher than a certain set temperature, the defrosting of the second outdoor heat exchanger 140 has reached a desired effect, and the controller 200 may control the first electronic control valve set 160 to be opened and the second electronic control valve set 170 to be closed, so that the high-temperature and high-pressure refrigerant discharged from the compressor 110 may flow into the first outdoor heat exchanger 120 after passing through the four-way valve ST, thereby defrosting the first outdoor heat exchanger 120.
In an embodiment of the present invention, when the multi-split air-conditioning system switches from defrosting the second outdoor heat exchanger 140 to defrosting the first outdoor heat exchanger 120, since the outlet of the second outdoor heat exchanger 140 is connected to the outlet of the second anti-freezing assembly 150, and a one-way solenoid valve is not disposed before the outlet of the second outdoor heat exchanger 140 is connected to the outlet of the second anti-freezing assembly 150, if the anti-freezing control valve SV1 is opened, a portion of the high-temperature and high-pressure refrigerant discharged from the compressor 110 after passing through the oil separator will be poured into the second outdoor heat exchanger 140 through the second anti-freezing assembly 150 and condensed in the second outdoor heat exchanger 140, and the amount of the refrigerant flowing into the first outdoor heat exchanger 120 will be reduced, thereby reducing the efficiency of defrosting the first outdoor heat exchanger 120. Therefore, when the multi-split air-conditioning system is switched from defrosting the second outdoor heat exchanger 140 to defrosting the first outdoor heat exchanger 120, the anti-freezing electric control valve SV1 may be controlled to be closed first to increase the amount of refrigerant flowing into the first outdoor heat exchanger 120, thereby ensuring the efficiency of defrosting the first outdoor heat exchanger 120.
In one embodiment of the present invention, the controller 200 may control the anti-freezing electrically controlled valve SV1 to be opened or maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger 120.
Specifically, the controller 200 may determine whether the outlet temperature of the first outdoor heat exchanger 120 is greater than or equal to a first preset temperature. If the outlet temperature of the first outdoor heat exchanger 120 is greater than or equal to the first preset temperature, the controller 200 may control the anti-freezing electric control valve SV1 to open; if the outlet temperature of the first outdoor heat exchanger 120 is less than the first preset temperature, the controller 200 may control the anti-freezing electrically controlled valve SV1 to maintain the closed state. It can be understood that the high-temperature and high-pressure refrigerant discharged from the compressor 110 may flow into the first outdoor heat exchanger 120 after passing through the four-way valve ST, and defrost the first outdoor heat exchanger 120, at this time, the temperature of the refrigerant in the first outdoor heat exchanger 120 may be decreased, and thus the outlet temperature of the first outdoor heat exchanger 120 is low. As the high-temperature and high-pressure refrigerant discharged from the compressor 110 continuously flows into the first outdoor heat exchanger 120, the frost in the first outdoor heat exchanger 120 is continuously reduced, the temperature of the refrigerant in the first outdoor heat exchanger 120 is continuously increased, that is, the outlet temperature of the first outdoor heat exchanger 120 is continuously increased, when the outlet temperature of the first outdoor heat exchanger 120 is greater than or equal to the first preset temperature, the defrosting of the first outdoor heat exchanger 120 has reached a desired effect, at this time, the controller 200 may control the anti-freezing electrically controlled valve SV1 to be opened to reheat the defrosting water generated by the first outdoor heat exchanger 120 at the first anti-freezing assembly 130 to prevent the defrosting water generated by the first outdoor heat exchanger 120 from being secondarily frozen, when the outlet temperature of the first outdoor heat exchanger 120 is less than the first preset temperature, the efficient defrosting of the first outdoor heat exchanger 120 is further required to be continuously performed, at this time, the controller 200 may control the anti-freeze electrically controlled valve to maintain a closed state.
In an embodiment of the present invention, during the switching of the multi-split system from the defrosting operation mode back to the heating operation mode, the controller 200 may control the anti-freeze electric control valve to be opened to heat the defrosting water generated by the first outdoor heat exchanger 120 at the first anti-freeze assembly 130 and the defrosting water generated by the second outdoor heat exchanger 140 at the second anti-freeze assembly 150. That is, after the first outdoor heat exchanger 120 and the second outdoor heat exchanger 140 are defrosted separately in the multi-split air conditioning system, the controller 200 may control the first electronic control valve group 130 and the second electronic control valve group 150 to be opened, and cause the compressor 110 to start to reduce the frequency to prepare for switching back to the heating operation mode. In this process, the controller 200 may control the anti-freezing electrically controlled valve SV1 to open, so that the high-temperature and high-pressure refrigerant discharged from the compressor 110 may flow into the first anti-freezing assembly 130 and the second anti-freezing assembly 150 after passing through the oil separator, and may heat the frost water generated by the first outdoor heat exchanger 120 at the first anti-freezing assembly 130 and the frost water generated by the second outdoor heat exchanger 140 at the second anti-freezing assembly 150 again. Thereby, the frosted water generated from the first outdoor heat exchanger 120 at the first anti-freeze assembly 130 and the frosted water generated from the second outdoor heat exchanger 140 at the second anti-freeze assembly 150 can be prevented from being secondarily frozen.
In one embodiment of the invention, after the multi-split system is switched back to the heating operation mode, the anti-freezing electric control valve SV1 can be controlled according to the outdoor environment temperature.
Specifically, when the external environment temperature is higher than a certain value, if the multi-split air conditioning system is switched to the defrosting operation mode again, because the temperature of the outdoor heat exchanger is relatively high, the defrosting efficiency of the outdoor heat exchanger is also high, and the probability of secondary icing of defrosting water generated by the outdoor heat exchanger is low, the anti-freezing electric control valve SV1 can be controlled to be closed. If the multi-split air-conditioning system continuously operates in the heating mode, the anti-freezing electric control valve SV1 can be controlled according to a high-pressure protection logic, specifically, if the multi-split air-conditioning system enters high-pressure protection, the anti-freezing electric control valve SV1 can be controlled to be opened, a part of high-temperature and high-pressure refrigerant discharged from the compressor 110 passes through the oil separator, and directly flows into the low-pressure tank through the anti-freezing electric control valve SV1, the first anti-freezing assembly 130 and the second anti-freezing assembly 150, so that pressure relief of the multi-split air-conditioning system is realized, namely, the anti-freezing electric control valve SV1 can be used as a pressure relief valve; if the multi-split air-conditioning system does not enter the high-pressure prevention protection, the anti-freezing electric control valve SV1 can be controlled to be closed. When the external environment temperature is lower than a certain value, and the defrosting water may still exist in the outdoor heat exchanger, the controller 200 may control the anti-freezing electrically controlled valve SV1 to be opened for a period of time to reheat the defrosting water generated by the first outdoor heat exchanger 120 at the first anti-freezing assembly 130 and the defrosting water generated by the second outdoor heat exchanger 140 at the second anti-freezing assembly 150, thereby preventing the defrosting water from being frozen again. After the anti-freezing electric control valve SV1 is opened for a period of time, the anti-freezing electric control valve SV1 can be controlled according to the high-pressure protection logic.
According to the multi-split system of the embodiment of the invention, when the multi-split system is operated for heating, the controller may control the multi-split system to switch from the heating operation mode to the defrosting operation mode according to the received defrosting instruction, may defrost the second outdoor heat exchanger after the multi-split system is switched to the defrosting operation mode, may control the anti-freezing electrically controlled valve to open to heat the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing assembly and preheat the first anti-freezing assembly, may switch to defrost the first outdoor heat exchanger when a preset condition is satisfied, may control the anti-freezing electrically controlled valve to close and obtain the outlet temperature of the first outdoor heat exchanger, and may control the anti-freezing electrically controlled valve to open or maintain a closed state according to the outlet temperature of the first outdoor heat exchanger, thereby, by reasonably controlling the on-off state of the anti-freezing solenoid valve, the defrosting efficiency of the outdoor heat exchanger can be improved, and the defrosting water generated by the outdoor heat exchanger can be prevented from being frozen for the second time, so that the drainage of the drain hole is ensured to be smooth, and the normal operation of the multi-split air-conditioning system is ensured.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (11)
1. A defrosting control method of a multi-split air-conditioning system is characterized in that an outdoor unit of the multi-split air-conditioning system comprises a compressor, a four-way valve, an anti-freezing electric control valve, a first outdoor heat exchanger, a first anti-freezing component arranged corresponding to the first outdoor heat exchanger, a second outdoor heat exchanger and a second anti-freezing component arranged corresponding to the second outdoor heat exchanger, wherein a first port of the four-way valve is connected with an outlet of the compressor, a second port of the four-way valve is connected to an inlet of the first outdoor heat exchanger through a first electric control valve group and is connected to an inlet of the second outdoor heat exchanger through a second electric control valve group, one end of the anti-freezing electric control valve is connected with the outlet of the compressor, the other end of the anti-freezing electric control valve is respectively connected with an inlet of the first anti-freezing component and an inlet of the second anti-freezing component, an outlet of the second outdoor heat exchanger is communicated with an outlet of the second anti-freezing assembly, and the defrosting control method comprises the following steps:
when the multi-split air conditioning system is in heating operation, controlling a first port and a second port of the four-way valve to be communicated according to a received defrosting instruction so as to control the multi-split air conditioning system to be switched from a heating operation mode to a defrosting operation mode;
after the multi-split system is switched to a defrosting operation mode, the second electric control valve group is controlled to be opened, and the first electric control valve group is controlled to be closed, so that defrosting is carried out on the second outdoor heat exchanger;
when the second outdoor heat exchanger is defrosted, the anti-freezing electric control valve is controlled to be opened so as to heat defrosting water generated by the second outdoor heat exchanger at the second anti-freezing component and preheat the first anti-freezing component;
when a preset condition is met, the first electric control valve group is controlled to be opened, the second electric control valve group is controlled to be closed, and defrosting of the first outdoor heat exchanger is switched;
when the defrosting of the first outdoor heat exchanger is switched to, controlling the anti-freezing electric control valve to be closed, and acquiring the outlet temperature of the first outdoor heat exchanger;
and controlling the anti-freezing electric control valve to be opened or to be maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger.
2. The defrosting control method of a multi-split system as claimed in claim 1, wherein controlling the anti-freezing electrically controlled valve to be opened or to be maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger comprises:
judging whether the outlet temperature of the first outdoor heat exchanger is greater than or equal to a first preset temperature or not;
if the outlet temperature of the first outdoor heat exchanger is greater than or equal to the first preset temperature, controlling the anti-freezing electric control valve to be opened;
and if the outlet temperature of the first outdoor heat exchanger is lower than the first preset temperature, controlling the anti-freezing electric control valve to maintain a closed state.
3. The defrosting control method of a multi-split air-conditioning system according to claim 1 or 2, wherein during the switching of the multi-split air-conditioning system from the defrosting operation mode to the heating operation mode, the anti-freezing electrically controlled valve is controlled to be opened to heat the defrosting water generated by the first outdoor heat exchanger at the first anti-freezing assembly and the defrosting water generated by the second outdoor heat exchanger at the second anti-freezing assembly.
4. The defrosting control method of a multi-split air-conditioning system according to claim 3, wherein the anti-freezing electric control valve is controlled according to an outdoor ambient temperature after the multi-split air-conditioning system is switched back to the heating operation mode.
5. A defrosting control method for a multi-split system as claimed in claim 1, wherein the anti-freezing electric control valve, the electric control valve in the first electric control valve group and the electric control valve in the second electric control valve group are all one-way solenoid valves.
6. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements a defrost control method of a multi-split system according to any one of claims 1 to 5.
7. A multiple on-line system, comprising:
the outdoor unit comprises a compressor, a four-way valve, an anti-freezing electric control valve, a first outdoor heat exchanger, a first anti-freezing assembly arranged corresponding to the first outdoor heat exchanger, a second outdoor heat exchanger and a second anti-freezing assembly arranged corresponding to the second outdoor heat exchanger, wherein a first port of the four-way valve is connected with an outlet of the compressor, a second port of the four-way valve is connected to an inlet of the first outdoor heat exchanger through a first electric control valve group and is connected to an inlet of the second outdoor heat exchanger through a second electric control valve group, one end of the anti-freezing electric control valve is connected with an outlet of the compressor, the other end of the anti-freezing electric control valve is respectively connected with the inlet of the first anti-freezing assembly and the inlet of the second anti-freezing assembly, and an outlet of the second outdoor heat exchanger is communicated with an outlet of the second anti-freezing assembly, and
a controller to:
when the multi-split air conditioning system is in heating operation, controlling a first port and a second port of the four-way valve to be communicated according to a received defrosting instruction so as to control the multi-split air conditioning system to be switched from a heating operation mode to a defrosting operation mode;
after the multi-split system is switched to a defrosting operation mode, the second electric control valve group is controlled to be opened, and the first electric control valve group is controlled to be closed, so that defrosting is carried out on the second outdoor heat exchanger;
when the second outdoor heat exchanger is defrosted, the anti-freezing electric control valve is controlled to be opened so as to heat defrosting water generated by the second outdoor heat exchanger at the second anti-freezing component and preheat the first anti-freezing component;
when a preset condition is met, the first electric control valve group is controlled to be opened, the second electric control valve group is controlled to be closed, and defrosting of the first outdoor heat exchanger is switched;
when the defrosting of the first outdoor heat exchanger is switched to, controlling the anti-freezing electric control valve to be closed, and acquiring the outlet temperature of the first outdoor heat exchanger;
and controlling the anti-freezing electric control valve to be opened or to be maintained in a closed state according to the outlet temperature of the first outdoor heat exchanger.
8. The multi-split system as claimed in claim 7, wherein the controller is configured to determine whether an outlet temperature of the first outdoor heat exchanger is greater than or equal to a first preset temperature, control the anti-freeze electrically controlled valve to open when the outlet temperature of the first outdoor heat exchanger is greater than or equal to the first preset temperature, and control the anti-freeze electrically controlled valve to maintain a closed state when the outlet temperature of the first outdoor heat exchanger is less than the first preset temperature.
9. A multi-split system as claimed in claim 7 or 8, wherein the controller controls the anti-freeze electrically controlled valve to open to heat the defrost water generated by the first outdoor heat exchanger at the first anti-freeze assembly and the defrost water generated by the second outdoor heat exchanger at the second anti-freeze assembly during the switching of the multi-split system from the defrosting operation mode to the heating operation mode.
10. The multi-split system as claimed in claim 9, wherein the controller controls the anti-freezing electrically controlled valve according to an outdoor ambient temperature after the multi-split system is switched back to the heating operation mode.
11. A multi-split system as claimed in claim 7, wherein the freeze prevention electric control valve, the electric control valve of the first electric control valve group and the electric control valve of the second electric control valve group are all one-way solenoid valves.
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| CN108413666B (en) * | 2018-03-07 | 2021-01-08 | 骊阳(广东)节能科技股份有限公司 | Efficient air source heat pump system capable of quickly defrosting |
| CN208431987U (en) * | 2018-05-29 | 2019-01-25 | 珠海格力电器股份有限公司 | Outdoor unit and air conditioning system |
| CN110425686B (en) * | 2019-08-09 | 2020-10-27 | 珠海格力电器股份有限公司 | Defrosting control method for air-cooled module unit, computer device and computer readable storage medium |
| CN110567099A (en) * | 2019-09-23 | 2019-12-13 | 宁波奥克斯电气股份有限公司 | Method and device for preventing outdoor unit of multi-connected air conditioner from freezing and air conditioner |
| CN113847741B (en) * | 2021-08-30 | 2023-07-18 | 青岛海尔空调电子有限公司 | Method and device for defrosting water heater, water heater and storage medium |
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