CN111121337B - Air conditioner double-condenser defrosting method and air conditioner - Google Patents
Air conditioner double-condenser defrosting method and air conditioner Download PDFInfo
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- CN111121337B CN111121337B CN201911412820.0A CN201911412820A CN111121337B CN 111121337 B CN111121337 B CN 111121337B CN 201911412820 A CN201911412820 A CN 201911412820A CN 111121337 B CN111121337 B CN 111121337B
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- General Engineering & Computer Science (AREA)
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- Air Conditioning Control Device (AREA)
- Defrosting Systems (AREA)
Abstract
The invention provides a defrosting method for double condensers of an air conditioner, which comprises a pipeline control device and a throttling device for controlling a first condenser and a second condenser, wherein defrosting periods of the first condenser and the second condenser are separated. In the traditional defrosting mode, a four-way valve reversing valve is used for exchanging the flow direction of a refrigerant, so that an outdoor unit is heated in a heat reverse circulation mode to achieve the aim of defrosting, the whole process approximately needs a long time, and the indoor temperature fluctuation is large, so that the comfort level experience of a user is influenced; in order to solve the technical problem, the technical scheme in the application solves the problem by adjusting the frosting time of the double condensers so that the double condensers are frosted at intervals, and simultaneously enabling one of the double condensers to be in a defrosting state and the other to be in a heating state. Because the condenser is frosted at intervals, the other condenser can ensure that the indoor temperature is not greatly influenced.
Description
Technical Field
The invention relates to the field of air conditioning equipment, in particular to a defrosting method and a defrosting system for double condensers of an air conditioner.
Background
The group coil pipe of the air-conditioning heat pump is easy to frost in a low-temperature environment, the heat conversion efficiency of the group coil pipe is influenced, and the group coil pipe is difficult to operate under the low-temperature condition.
In addition, an electric heating defrosting mode is adopted, so that the electric energy loss is increased, the energy-saving advantage of the heat pump air conditioner is not existed, meanwhile, the service life of the electric heating pipe is limited, the possibility of fire caused by overheating exists, potential hazards exist in the aspect of safety, and the method is not an ideal mode.
Disclosure of Invention
In order to solve at least one problem, the invention provides a defrosting method for a double condenser of an air conditioner, which comprises a pipeline control device and a throttling device for controlling a first condenser and a second condenser, wherein defrosting periods of the first condenser and the second condenser are separated.
In the traditional defrosting mode, a four-way valve reversing valve is used for exchanging the flow direction of a refrigerant, so that an outdoor unit is heated in a heat reverse circulation mode to achieve the aim of defrosting, the whole process approximately needs a long time, and the indoor temperature fluctuation is large, so that the comfort level experience of a user is influenced; in order to solve the technical problem, the technical scheme in the application solves the problem by adjusting the frosting time of the double condensers so that the double condensers are frosted at intervals, and simultaneously enabling one of the double condensers to be in a defrosting state and the other to be in a heating state. Because the condenser is frosted at intervals, the other condenser can ensure that the indoor temperature is not greatly influenced.
Preferably, the first defrosting condition for defrosting the first condenser is controlled to be lower than the preset defrosting condition.
The defrosting condition of the first condenser is reduced to enable the first condenser to enter a defrosting process before the other condenser, at the moment, frosting of the first condenser and frosting of the second condenser are not synchronous, the two condensers frosting at intervals, and meanwhile, the pipeline control device and the throttling device control the two condensers to defrost at intervals, so that the indoor temperature is guaranteed not to be greatly fluctuated.
Preferably, the first defrosting condition being lower than the preset defrosting condition comprises: and controlling the heating period of defrosting of the first condenser to be lower than a preset period.
When the defrosting is started, the first condenser can be operated according to a preset period, in the first defrosting, the first condenser is defrosted before the preset period, the second condenser is in a heating state at the moment, and the surface of the first condenser is frosted continuously, so that the effect of asynchronously frosting the first condenser and the second condenser is achieved, the defrosting operation is controlled, and the indoor temperature is stable.
Preferably, the first defrosting condition being lower than the preset defrosting condition comprises: the specified temperature for controlling the defrosting of the first condenser is lower than the preset temperature.
Except controlling the defrosting operation according to the preset period, the defrosting operation can be controlled according to the temperature of the temperature sensor on the condenser, when the defrosting is started for the first time, the requirement of the initial temperature is reduced, the first condenser enters the defrosting state in advance, the second condenser is in the heating state at the moment, the surface of the second condenser frosts continuously, the effect of asynchronously frosting the first condenser and the second condenser is achieved, the defrosting operation is controlled, and the indoor temperature is stable.
Preferably, the pipeline control device and the throttling device control a refrigerant to be firstly defrosted through the first condenser and then heated through the second condenser.
The series relation of the first condenser and the second condenser is changed through the operation of the pipeline control device, so that the refrigerant flows into the first condenser to be defrosted, the second condenser is in a heating state through the control of the throttling device, and the asynchronous period of the frosting state between the first condenser and the second condenser is ensured.
Preferably, the pipeline control device and the throttling device control a refrigerant to be firstly defrosted by the second condenser and then heated by the first condenser.
The series relation of the first condenser and the second condenser is changed through the operation of the pipeline control device, so that the refrigerant flows into the second condenser for defrosting firstly, the first condenser is in a heating state through the control of the throttling device, and the asynchronous period of the frosting state between the first condenser and the second condenser is ensured.
Preferably, the defrosting mode is exited when the temperature of the condensation duct rises to a preset temperature.
When the first condenser or the second condenser is in a defrosting state, the defrosting operation is finished according to the temperature state of the first condenser or the second condenser.
The application also provides a double-condenser defrosting device, a four-way valve, an internal machine, a condenser, a pipeline control device for connecting the four-way valve, the internal machine and the condenser, and a throttling device arranged on the pipeline control device, wherein the method recorded in the technical scheme is applied;
the pipeline control device comprises a first branch, a second branch, a fourth branch, a third branch, a fifth branch, a fourth branch, a seventh branch, a ninth branch, a fourth branch, a ninth branch, a solenoid valve B1, a solenoid valve B8, a fourth branch, a fifth branch, a sixth branch, a seventh branch, a ninth branch, a fourth branch and a fifth branch, wherein the second branch and the fourth branch are arranged at two ends of the first condenser respectively;
the solenoid valve B1 is arranged on the third branch between the seventh branch and the first branch,
the solenoid valve B2 is arranged on a second branch between the seventh branch and the first branch,
the solenoid valve B3 is disposed on the seventh branch between the eighth branch and the third branch,
the solenoid valve B4 is disposed on the seventh branch between the eighth branch and the second branch,
the solenoid valve B5 is arranged on the ninth branch between the eighth branch and the fifth branch,
the solenoid valve B6 is arranged on the ninth branch between the eighth branch and the fourth branch,
the solenoid valve B7 is arranged on the fifth branch between the ninth branch and the sixth branch,
the solenoid valve B8 is disposed on a fourth branch between the ninth branch and the sixth branch.
Preferably, the throttling means comprises a first electronic expansion valve A1, a second electronic expansion valve A2, and a third electronic expansion valve A3,
the first electronic expansion valve a1 is disposed on the fifth branch between the first condenser and the solenoid valve B7,
the second electronic expansion valve a2 is disposed on the fourth branch between the second condenser and the solenoid valve B8,
the third electronic expansion valve a3 is disposed on the sixth branch.
The arrangement of the pipelines can change the series and parallel relations between the first condenser and the second condenser, and simultaneously can control the sequence of the refrigerant flowing through the first condenser and the second condenser.
Preferably, when the first condenser is defrosted, the solenoid valves B2, B3, B6 and B7 are opened, the solenoid valves B1, B4, B5 and B8 are closed, the second electronic expansion valve a2 heats and throttles, and the first electronic expansion valve a1 and the third electronic expansion valve A3 are fully opened;
when the line control operates as described above, the first condenser defrosts and the second condenser heats.
When the second condenser is defrosted, the compressor normally operates, the electromagnetic valves B1, B4, B5 and B8 are opened, the electromagnetic valves B2, B3, B6 and B7 are closed, the first electronic expansion valve A1 heats and throttles, and the second electronic expansion valve A2 and the third electronic expansion valve A3 are fully opened.
When the line control operates as described above, the second condenser defrosts and the first condenser heats.
On the basis of the technical scheme, the air conditioner is further provided, and the double-condenser defrosting method and the double-condenser defrosting device are applied.
Drawings
FIG. 1 is a schematic structural view;
fig. 2 is a control block diagram.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship may be made without substantial technical changes.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 1 and 2, in a first embodiment, a double-condenser defrosting method for an air conditioner is provided, which comprises a pipeline control device and a throttling device for controlling a first condenser and a second condenser, wherein defrosting periods of the first condenser and the second condenser are separated. In the traditional defrosting mode, a four-way valve reversing valve is used for exchanging the flow direction of a refrigerant, so that an outdoor unit is heated in a heat reverse circulation mode to achieve the aim of defrosting, the whole process approximately needs a long time, and the indoor temperature fluctuation is large, so that the comfort level experience of a user is influenced; in order to solve the technical problem, the technical scheme in the application solves the problem by adjusting the frosting time of the double condensers so that the double condensers are frosted at intervals, and simultaneously enabling one of the double condensers to be in a defrosting state and the other to be in a heating state. Because the condenser is frosted at intervals, the other condenser can ensure that the indoor temperature is not greatly influenced.
The triggering condition for controlling the defrosting to be started is that the first defrosting condition for controlling the first condenser to defrost is lower than a preset defrosting condition. The defrosting condition of the first condenser is reduced to enable the first condenser to enter a defrosting process before the other condenser, at the moment, frosting of the first condenser and frosting of the second condenser are not synchronous, the two condensers frosting at intervals, and meanwhile, the pipeline control device and the throttling device control the two condensers to defrost at intervals, so that the indoor temperature is guaranteed not to be greatly fluctuated.
Specifically, the heating period for defrosting the first condenser is controlled to be lower than a preset period. When the defrosting is started, the first condenser can be operated according to a preset period, in the first defrosting, the first condenser is defrosted before the preset period, the second condenser is in a heating state at the moment, and the surface of the first condenser is frosted continuously, so that the effect of asynchronously frosting the first condenser and the second condenser is achieved, the defrosting operation is controlled, and the indoor temperature is stable.
In addition, the first defrosting condition being lower than the preset defrosting condition comprises the following steps: the specified temperature for controlling the defrosting of the first condenser is lower than the preset temperature. Except controlling the defrosting operation according to the preset period, the defrosting operation can be controlled according to the temperature of the temperature sensor on the condenser, when the defrosting is started for the first time, the requirement of the initial temperature is reduced, the first condenser enters the defrosting state in advance, the second condenser is in the heating state at the moment, the surface of the second condenser frosts continuously, the effect of asynchronously frosting the first condenser and the second condenser is achieved, the defrosting operation is controlled, and the indoor temperature is stable.
The two trigger conditions can be used simultaneously or alternatively. Except for the change of the preset conditions required for the first defrosting, the defrosting process is carried out according to the initial preset scheme. According to experience, the first defrosting period of a general first condenser is 20min shorter than the preset period, so that the defrosting effect can be ensured; in addition, when the defrosting operation is controlled according to the temperature, the designated temperature should be 3 ℃ lower than the preset temperature.
When the defrosting operation is performed, the first condenser and the second condenser are firstly changed into a series relationship, and two situations are divided:
(1) defrosting of a first condenser: the pipeline control device and the throttling device control a refrigerant to be defrosted through the first condenser at first and then to be heated through the second condenser. The series relation of the first condenser and the second condenser is changed through the operation of the pipeline control device, so that the refrigerant flows into the first condenser to be defrosted, the second condenser is in a heating state through the control of the throttling device, and the asynchronous period of the frosting state between the first condenser and the second condenser is ensured.
(2) Defrosting of a second condenser: the pipeline control device and the throttling device control a refrigerant to be defrosted through the second condenser firstly, and then the refrigerant is heated through the first condenser. The series relation of the first condenser and the second condenser is changed through the operation of the pipeline control device, so that the refrigerant flows into the second condenser for defrosting firstly, the first condenser is in a heating state through the control of the throttling device, and the asynchronous period of the frosting state between the first condenser and the second condenser is ensured.
In addition, in order to guarantee the indoor temperature requirement, the defrosting operation of the first condenser and the second condenser should be timely adjusted, and the defrosting mode is exited when the temperature of the condensation pipe rises to the preset temperature.
When the first condenser or the second condenser is in a defrosting state, the defrosting operation is finished according to the temperature state of the first condenser or the second condenser. Generally, when the temperature of the first condenser or the second condenser in defrosting rises to 5 ℃, the defrosting operation may be ended.
The application also provides a double-condenser defrosting device, a four-way valve, an internal machine, a condenser, a pipeline control device for connecting the four-way valve, the internal machine and the condenser, and a throttling device arranged on the pipeline control device, wherein the method recorded in the technical scheme is applied;
the pipeline control device comprises a first branch, a second branch, a fourth branch, a third branch, a fifth branch, a fourth branch, a seventh branch, a ninth branch, a fourth branch, a ninth branch, a solenoid valve B1, a solenoid valve B8, a fourth branch, a fifth branch, a sixth branch, a seventh branch, a ninth branch, a fourth branch and a fifth branch, wherein the second branch and the fourth branch are arranged at two ends of the first condenser respectively;
the solenoid valve B1 is arranged on the third branch between the seventh branch and the first branch,
the solenoid valve B2 is arranged on a second branch between the seventh branch and the first branch,
the solenoid valve B3 is disposed on the seventh branch between the eighth branch and the third branch,
the solenoid valve B4 is disposed on the seventh branch between the eighth branch and the second branch,
the solenoid valve B5 is arranged on the ninth branch between the eighth branch and the fifth branch,
the solenoid valve B6 is arranged on the ninth branch between the eighth branch and the fourth branch,
the solenoid valve B7 is arranged on the fifth branch between the ninth branch and the sixth branch,
the solenoid valve B8 is disposed on a fourth branch between the ninth branch and the sixth branch.
In addition, the throttling device comprises a first electronic expansion valve A1, a second electronic expansion valve A2 and a third electronic expansion valve A3,
the first electronic expansion valve a1 is disposed on the fifth branch between the first condenser and the solenoid valve B7,
the second electronic expansion valve a2 is disposed on the fourth branch between the second condenser and the solenoid valve B8,
the third electronic expansion valve a3 is disposed on the sixth branch.
The arrangement of the pipelines can change the series and parallel relations between the first condenser and the second condenser, and simultaneously can control the sequence of the refrigerant flowing through the first condenser and the second condenser.
When the system is in a refrigeration mode, the normal operation of the compressor is kept, the solenoid valves B1, B2, B7 and B8 are opened, the solenoid valves B3, B4, B5 and B6 are closed, the electronic expansion valves A1 and A2 are fully opened, the A3 is throttled, and the two condensers are in a parallel state.
When the system is in a heating mode, the normal operation of the compressor is kept, the solenoid valves B1, B2, B7 and B8 are opened, the solenoid valves B3, B4, B5 and B6 are closed, the electronic expansion valves A1 and A2 are throttled, the A3 is fully opened, and the double condensers are in a parallel state.
At the moment, the first condenser and the second condenser are in working states at the same time, and the temperature is guaranteed to be rapidly increased or decreased.
When the system is in a defrosting state, two situations are divided:
(1) when the first condenser is defrosted, the solenoid valves B2, B3, B6 and B7 are opened, the solenoid valves B1, B4, B5 and B8 are closed, the second electronic expansion valve A2 heats and throttles, and the first electronic expansion valve A1 and the third electronic expansion valve A3 are fully opened; when the line control operates as described above, the first condenser defrosts and the second condenser heats.
(2) When the second condenser is defrosted, the compressor normally operates, the electromagnetic valves B1, B4, B5 and B8 are opened, the electromagnetic valves B2, B3, B6 and B7 are closed, the first electronic expansion valve A1 heats and throttles, and the second electronic expansion valve A2 and the third electronic expansion valve A3 are fully opened. When the line control operates as described above, the second condenser defrosts and the first condenser heats.
On the basis of the technical scheme, the air conditioner is further provided, and the double-condenser defrosting method and the double-condenser defrosting device are applied.
First condenser and second condenser realize asynchronous frosting through the change of the parameter that gets into the operation of defrosting for the first time in the air conditioner, and asynchronous defrosting avoids carrying out the operation simultaneously and influences indoor temperature.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (5)
1. The defrosting method of the double condensers of the air conditioner is characterized in that: the defrosting method of the double condensers of the air conditioner is applied to a double condenser defrosting device, the double condenser defrosting device comprises a four-way valve, an inner machine, a condenser, a pipeline control device and a throttling device, the pipeline control device is connected with the four-way valve, the inner machine and the condenser, the throttling device is arranged on the pipeline control device, the condenser comprises a first condenser and a second condenser, the pipeline control device comprises a first branch to a ninth branch, a solenoid valve B1 to a solenoid valve B8, a second branch and a fourth branch are respectively arranged at two ends of the first condenser, a third branch and a fifth branch are respectively arranged at two ends of the second condenser, the second branch and the third branch are connected with the four-way valve through the first branch, the fourth branch and the fifth branch are connected with the inner machine through a sixth branch, and the seventh branch is connected with the second branch and the third branch, the ninth branch is connected with the fourth branch and the fifth branch;
the solenoid valve B1 is disposed on a third branch between the seventh branch and the first branch, the solenoid valve B2 is disposed on a second branch between the seventh branch and the first branch, the solenoid valve B3 is disposed on a seventh branch between an eighth branch and the third branch, the solenoid valve B4 is disposed on a seventh branch between the eighth branch and the second branch, the solenoid valve B5 is disposed on a ninth branch between the eighth branch and the fifth branch, the solenoid valve B6 is disposed on a ninth branch between the eighth branch and the fourth branch, the solenoid valve B7 is disposed on a fifth branch between the ninth branch and the sixth branch, and the solenoid valve B8 is disposed on a fourth branch between the ninth branch and the sixth branch;
the throttling device comprises a first electronic expansion valve A1, a second electronic expansion valve A2 and a third electronic expansion valve A3, the first electronic expansion valve A1 is arranged on the fifth branch between the first condenser and the solenoid valve B7, the second electronic expansion valve A2 is arranged on the fourth branch between the second condenser and the solenoid valve B8, and the third electronic expansion valve A3 is arranged on the sixth branch;
the dual condenser defrost method comprises: the defrosting periods of the first condenser and the second condenser are spaced, and the first defrosting condition of defrosting of the first condenser is controlled to be lower than a preset defrosting condition;
the first defrosting condition lower than the preset defrosting condition comprises the following steps: controlling the defrosting heating period of the first condenser to be lower than a preset period; and/or the first defrosting condition is lower than the preset defrosting condition and comprises the following steps: and controlling the specified temperature of the defrosting of the first condenser to be lower than the preset temperature.
2. The dual condenser defrost method of claim 1 wherein: when the first condenser enters a defrosting period, the pipeline control device and the throttling device control a refrigerant to be firstly defrosted by the first condenser and then heated by the second condenser.
3. The dual condenser defrost method of claim 1 wherein: when the second condenser enters a defrosting period, the pipeline control device and the throttling device control the refrigerant to be firstly defrosted by the second condenser and then heated by the first condenser.
4. The dual condenser defrost method of claim 1 wherein: when the first condenser is defrosted, the solenoid valves B2, B3, B6 and B7 are opened, the solenoid valves B1, B4, B5 and B8 are closed, the second electronic expansion valve A2 heats and throttles, and the first electronic expansion valve A1 and the third electronic expansion valve A3 are fully opened;
when the second condenser is defrosted, the compressor normally operates, the electromagnetic valves B1, B4, B5 and B8 are opened, the electromagnetic valves B2, B3, B6 and B7 are closed, the first electronic expansion valve A1 heats and throttles, and the second electronic expansion valve A2 and the third electronic expansion valve A3 are fully opened.
5. An air conditioner, characterized in that: use of the double condenser defrost method of any of claims 1-4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911412820.0A CN111121337B (en) | 2019-12-31 | 2019-12-31 | Air conditioner double-condenser defrosting method and air conditioner |
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| CN201911412820.0A CN111121337B (en) | 2019-12-31 | 2019-12-31 | Air conditioner double-condenser defrosting method and air conditioner |
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| CN112212551A (en) * | 2020-09-22 | 2021-01-12 | 艾泰斯热系统研发（上海）有限公司 | Structure compatible with cooling and defrosting of condensation pipe |
| CN114279044B (en) * | 2021-12-16 | 2023-03-03 | 珠海格力电器股份有限公司 | Defrosting method and device for air conditioning unit, control equipment and air conditioning unit |
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| CN105004114A (en) * | 2015-07-02 | 2015-10-28 | Tcl空调器(中山)有限公司 | Air conditioner and defrosting method thereof |
| EP2936008A1 (en) * | 2012-12-21 | 2015-10-28 | Fläkt Woods AB | Method and apparatus for defrosting of an evaporator in connection with an air handling unit |
| CN106918122A (en) * | 2017-04-01 | 2017-07-04 | 青岛海尔空调器有限总公司 | Air conditioner without shutting Defrost operation method |
| CN107401810A (en) * | 2017-07-24 | 2017-11-28 | 美的集团武汉制冷设备有限公司 | The control method of air conditioner, the control device of air conditioner and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2936008A1 (en) * | 2012-12-21 | 2015-10-28 | Fläkt Woods AB | Method and apparatus for defrosting of an evaporator in connection with an air handling unit |
| CN105004114A (en) * | 2015-07-02 | 2015-10-28 | Tcl空调器(中山)有限公司 | Air conditioner and defrosting method thereof |
| CN106918122A (en) * | 2017-04-01 | 2017-07-04 | 青岛海尔空调器有限总公司 | Air conditioner without shutting Defrost operation method |
| CN107401810A (en) * | 2017-07-24 | 2017-11-28 | 美的集团武汉制冷设备有限公司 | The control method of air conditioner, the control device of air conditioner and air conditioner |
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