CN108603706B - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN108603706B CN108603706B CN201680079374.4A CN201680079374A CN108603706B CN 108603706 B CN108603706 B CN 108603706B CN 201680079374 A CN201680079374 A CN 201680079374A CN 108603706 B CN108603706 B CN 108603706B
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- defrosting operation
- outdoor heat
- outdoor
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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
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the 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
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2120/00—Control inputs relating to users or occupants
- F24F2120/10—Occupancy
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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
- F25B2600/00—Control issues
- F25B2600/01—Timing
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/17—Speeds
- F25B2700/171—Speeds of the compressor
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The air conditioner includes: a refrigerant circuit in which a compressor, a flow path switching unit, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger are connected by piping, and through which a refrigerant flows; and a control unit that controls an operation of the refrigerant circuit to switch between a heating operation and a defrosting operation, the control unit including: a determination unit that determines whether or not to change a starting condition of the defrosting operation based on operation information of the refrigerant circuit when the heating operation is performed; a changing unit that changes a starting condition of the defrosting operation based on a determination result of the determining unit; and a switching means that switches the flow path switching section to start the defrosting operation when the defrosting operation start condition is satisfied.
Description
Technical Field
The present invention relates to an air conditioner that removes frost adhering to an outdoor heat exchanger.
Background
Conventionally, an air conditioner having a refrigerant circuit formed by connecting a compressor, a flow path switching unit, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger by pipes is known. In the heating operation, when the pressure saturation temperature of the outdoor heat exchanger functioning as an evaporator is equal to or lower than the dew point temperature of outdoor air and equal to or lower than the freezing point of water, frost adheres to the outdoor heat exchanger. When frost adheres to an outdoor heat exchanger, an air conditioner performs a defrosting operation for removing the frost adhering to the outdoor heat exchanger, thereby suppressing a decrease in heat exchange performance of the outdoor heat exchanger due to a frost phenomenon.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-185535
Disclosure of Invention
Problems to be solved by the invention
However, the starting condition of the defrosting operation of the air conditioner disclosed in patent document 1 is not changed. Therefore, if a person is present indoors, even if the defrosting operation start condition is satisfied, the defrosting operation is not performed, and the heat exchange capacity of the outdoor heat exchanger is reduced. Thus, patent document 1 cannot accurately determine whether or not the defrosting operation is performed.
The present invention has been made to solve the above-described problems, and provides an air conditioner that improves the accuracy of determining whether to perform a defrosting operation.
Means for solving the problems
The air conditioner of the invention includes: a refrigerant circuit in which a compressor, a flow path switching unit, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger are connected by piping, and through which a refrigerant flows; and a control unit that controls an operation of the refrigerant circuit to switch between a heating operation and a defrosting operation, the control unit including: a determination unit that determines whether or not to change a starting condition of the defrosting operation based on operation information of the refrigerant circuit when the heating operation is performed; a changing unit that changes a starting condition of the defrosting operation based on a determination result of the determining unit; and a switching means for switching the flow path switching unit to start the defrosting operation when the defrosting operation start condition is satisfied.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the starting condition of the defrosting operation is changed based on the judgment result of the operation information. Therefore, whether or not the defrosting operation is performed can be accurately determined.
Drawings
Fig. 1 is a circuit diagram showing an air conditioner 1 according to embodiment 1 of the present invention.
Fig. 2 is a block diagram showing the control unit 30 of the air conditioner 1 according to embodiment 1 of the present invention.
Fig. 3 is a flowchart showing the operation of the air conditioner 1 according to embodiment 1 of the present invention.
Fig. 4 is a block diagram showing the control unit 130 of the air conditioner 100 according to embodiment 2 of the present invention.
Fig. 5 is a block diagram showing a control unit 230 of an air conditioner 200 according to embodiment 3 of the present invention.
Fig. 6 is a block diagram showing control unit 330 of air conditioner 300 according to embodiment 4 of the present invention.
Fig. 7 is a flowchart showing the operation of air conditioner 300 according to embodiment 4 of the present invention.
Fig. 8 is a block diagram showing a control unit 430 of an air conditioner 400 according to embodiment 5 of the present invention.
Fig. 9 is a flowchart showing the operation of the air conditioner 400 according to embodiment 5 of the present invention.
Detailed Description
Hereinafter, an embodiment of an air conditioner according to the present invention will be described with reference to the drawings. Fig. 1 is a circuit diagram showing an air conditioner 1 according to embodiment 1 of the present invention. The air conditioner 1 is explained based on fig. 1. As shown in fig. 1, the air conditioner 1 includes an outdoor unit 2, an indoor unit 3, and a remote controller 4. The outdoor unit 2 is installed outdoors, and includes a compressor 6, a flow path switching unit 7, an outdoor heat exchanger 8, an outdoor blower 8a, an expansion unit 9, an outdoor temperature detection unit 21, an outdoor heat exchange temperature detection unit 22, and an outdoor control board 30 a. The indoor unit 3 is installed indoors, and includes an indoor heat exchanger 10, an indoor blower 10a, an indoor temperature detection unit 23, a human body detection unit 24, and an indoor control board 30 b. Here, the compressor 6, the flow path switching unit 7, the outdoor heat exchanger 8, the expansion unit 9, and the indoor heat exchanger 10 are connected by pipes to constitute the refrigerant circuit 5 through which the refrigerant flows. The outdoor control board 30a and the indoor control board 30b constitute a control unit 30.
The compressor 6 compresses a refrigerant. The flow switching unit 7 switches the direction of the flow of the refrigerant in the refrigerant circuit 5. The flow path switching unit 7 switches the refrigerant discharged from the compressor 6 to flow to the outdoor heat exchanger 8 or to flow to the indoor heat exchanger 10, thereby performing any one of the cooling operation, the heating operation, and the defrosting operation. The outdoor heat exchanger 8 exchanges heat between the outdoor air and the refrigerant. The outdoor blower 8a blows outdoor air to the outdoor heat exchanger 8. The expansion unit 9 expands and decompresses the refrigerant, and is, for example, an electromagnetic expansion valve whose opening degree is adjusted. The indoor heat exchanger 10 exchanges heat between indoor air and refrigerant. The indoor blower 10a blows indoor air to the indoor heat exchanger 10.
The outdoor temperature detection unit 21 detects the outdoor temperature. The outdoor heat exchange temperature detection unit 22 detects the temperature of the outdoor heat exchanger 8. The indoor temperature detector 23 detects the indoor temperature. The human body detection unit 24 detects the presence or absence of a human body. The outdoor control board 30a controls each device of the outdoor unit 2, and the indoor control board 30b controls each device of the indoor unit 3. The outdoor control board 30a and the indoor control board 30b are connected by an inside/outside communication line 30c, and transmit and receive signals through the inside/outside communication line 30 c.
The remote controller 4 is connected to the indoor control board 30b by a remote control line 4a, and transmits and receives signals to and from the indoor control board 30b via the remote control line 4 a. For example, the remote controller 4 transmits a stop signal for stopping the operation of the refrigerant circuit 5 to the indoor control board 30 b. This stops the operation of the indoor unit 3 and the outdoor unit 2. The remote controller 4 transmits a start signal for starting the operation of the refrigerant circuit 5 to the indoor control board 30 b. Thereby, the indoor unit 3 and the outdoor unit 2 start operating.
Fig. 2 is a block diagram showing the control unit 30 of the air conditioner 1 according to embodiment 1 of the present invention. Next, the control unit 30 will be explained. In embodiment 1, the control unit 30 is, for example, a CPU and is configured by the outdoor control board 30a and the indoor control board 30b as described above, but the control unit 30 may be a single control board and may be provided in any one of the outdoor unit 2 and the indoor units 3. The control unit 30 may be provided outside the outdoor unit 2 and the indoor units 3. As shown in fig. 2, the control unit 30 includes a storage unit 31, a determination unit 32, a change unit 33, and a switching unit 34.
The storage means 31 stores an outdoor heat exchange temperature threshold value required for the starting condition of the defrosting operation, and the like. In the case of performing a heating operation in which the outdoor heat exchanger 8 functions as an evaporator, the starting conditions of the defrosting operation are: the temperature of the outdoor heat exchanger 8 is below the outdoor heat exchange temperature threshold. When the heating operation is performed for a long time, the pressure saturation temperature of the outdoor heat exchanger 8 functioning as an evaporator decreases. When the pressure saturation temperature of the outdoor heat exchanger 8 is equal to or lower than the dew point temperature of the outdoor air and equal to or lower than the freezing point of water, frost adheres to the outdoor heat exchanger 8. When frost adheres to the outdoor heat exchanger 8, the air conditioner 1 performs a defrosting operation for removing the frost adhering to the outdoor heat exchanger 8, thereby suppressing a decrease in the heat exchange performance of the outdoor heat exchanger 8 due to the frost phenomenon. In embodiment 1, the starting condition of the defrosting operation is a decrease in the temperature of the outdoor heat exchanger 8, but the present invention is not limited to this, and may be a decrease in the outdoor temperature or the like.
When the heating operation is performed, the determination unit 32 determines whether or not to change the starting condition of the defrosting operation based on the operation information of the refrigerant circuit 5. In embodiment 1, the operation information is the temperature detected by the outdoor temperature detecting unit 21. That is, the determination unit 32 determines whether or not the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold.
The changing means 33 changes the starting condition of the defrosting operation based on the determination result of the determining means 32. In embodiment 1, the operation information is the temperature detected by the outdoor temperature detecting unit 21. That is, when the determination unit 32 determines that the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold, the change unit 33 changes the defrosting operation start condition.
As described above, in embodiment 1, when the heating operation is performed in which the outdoor heat exchanger 8 functions as an evaporator, the defrosting operation is started under the following conditions: the temperature of the outdoor heat exchanger 8 is below the outdoor heat exchange temperature threshold. When the heating operation is performed, the changing means 33 changes the outdoor heat-exchange temperature threshold to an outdoor heat-exchange temperature relaxation threshold higher than the outdoor heat-exchange temperature threshold, based on the operation information of the refrigerant circuit 5. When the outdoor heat exchange temperature threshold is set to Thex1 and the outdoor heat exchange temperature relaxation threshold is set to Thex2, Thex1< Thex 2. Thus, when the heating operation is performed and the temperature of the outdoor heat exchanger 8 is decreasing, the outdoor heat exchange temperature reaches the outdoor heat exchange temperature relaxation threshold Thex2 earlier than the outdoor heat exchange temperature threshold Thex 1. That is, the outdoor heat exchange temperature relaxation threshold Thex2 relaxes the starting condition of the defrosting operation and starts the defrosting operation earlier than the outdoor heat exchange temperature threshold Thex 1.
In this way, when it is determined that the temperature detected by the outdoor temperature detecting unit 21 is equal to or lower than the outdoor temperature threshold, the outdoor heat exchange temperature threshold is changed to the outdoor heat exchange temperature relaxation threshold. Thus, when the outdoor temperature is low, it is determined that frost is likely to adhere to the outdoor heat exchanger 8, and the defrosting operation is easily performed.
The changing means 33 also has a function of changing the starting condition of the defrosting operation based on the detection result of the human body detecting unit 24. In embodiment 1, when the heating operation is performed and no person is detected by the human body detector 24 in the indoor space, the changing means 33 changes the outdoor heat-exchange temperature threshold to the outdoor heat-exchange temperature relaxation threshold higher than the outdoor heat-exchange temperature threshold. Thus, when no one is present indoors, it is highly likely that the heating operation is not necessary, and the defrosting operation is easily performed.
When the defrosting operation start condition stored in the storage unit 31 is satisfied, the switching unit 34 switches the flow path switching unit 7 to start the defrosting operation. Here, when the heating operation is performed in which the outdoor heat exchanger 8 functions as an evaporator, the defrosting operation is started under the following conditions: the temperature of the outdoor heat exchanger 8 is below the outdoor heat exchange temperature threshold. When the starting condition of the defrosting operation is not changed by the changing means 33, the switching means 34 switches the flow path switching unit 7 when the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detecting unit 22 is equal to or lower than the outdoor heat exchange temperature threshold value. When the start condition of the defrosting operation is changed by the changing means 33, the switching means 34 switches the flow path switching unit 7 when the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detecting unit 22 is equal to or lower than the outdoor heat exchange temperature relaxation threshold.
The control unit 30 also performs the operation of turning off the temperature sensor and turning on the temperature sensor. This is for the actual room temperature U: i ℃ and set temperature V: j ℃, and determines whether to continue the operation of the outdoor unit 2 and the indoor unit 3. Here, the actual room temperature U is a temperature detected by the room temperature detecting unit 23. The set temperature V is a target room temperature set by the user or the like using the remote controller 4. In the heating operation, when the actual room temperature U is equal to or higher than the set temperature V (i ≧ j), the control unit 30 constituted by the outdoor control board 30a and the indoor control board 30b determines that the heating capability sought by the user is ensured, and performs an operation of turning off the temperature sensor that temporarily stops the operation. At that time, the stopped indoor unit 3 transmits a temperature sensor off signal to the control unit 30.
Further, the operation is continued even when the temperature sensor is turned off. When the actual room temperature U becomes lower than the set temperature V (i < j) when the temperature sensor is off, the control unit 30 constituted by the outdoor control board 30a and the indoor control board 30b determines that the heating capacity sought by the user is insufficient, and performs an operation of turning on the temperature sensor to restart the operation. At this time, the indoor unit 3 that has restarted operation transmits a temperature sensor on signal to the control unit 30.
Next, the operation mode of the air conditioner 1 will be described. The air conditioner 1 has a cooling operation, a heating operation, and a defrosting operation as operation modes. In the cooling operation, the refrigerant flows through the compressor 6, the flow switching unit 7, the outdoor heat exchanger 8, the expansion unit 9, and the indoor heat exchanger 10 in this order, and the indoor air is cooled by exchanging heat with the refrigerant in the indoor heat exchanger 10. In the heating operation, the refrigerant flows through the compressor 6, the flow switching unit 7, the indoor heat exchanger 10, the expansion unit 9, and the outdoor heat exchanger 8 in this order, and the indoor air and the refrigerant are heat-exchanged in the indoor heat exchanger 10 to heat the indoor air. The defrosting operation causes the refrigerant to flow through the compressor 6, the flow switching unit 7, the outdoor heat exchanger 8, the expansion unit 9, and the indoor heat exchanger 10 in this order, and removes frost adhering to the outdoor heat exchanger 8.
Next, the operation of each operation mode of the air conditioner 1 will be described. First, the cooling operation is explained. In the cooling operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gas-state refrigerant discharged from the compressor 6 flows into the outdoor heat exchanger 8 through the flow switching unit 7, exchanges heat with outdoor air blown by the outdoor blower 8a in the outdoor heat exchanger 8, and is condensed and liquefied. The condensed refrigerant in a liquid state flows into the expansion portion 9, and is expanded and decompressed in the expansion portion 9 to be in a gas-liquid two-phase state. Then, the refrigerant in the gas-liquid two-phase state flows into the indoor heat exchanger 10, exchanges heat with the indoor air at the indoor heat exchanger 10, and is evaporated and gasified. At this time, the indoor air is cooled to perform cooling. The evaporated refrigerant in a gaseous state is sucked into the compressor 6 through the flow switching unit 7.
Next, the heating operation will be described. In the heating operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gas-state refrigerant discharged from the compressor 6 flows into the indoor heat exchanger 10 through the flow switching unit 7, exchanges heat with the indoor air blown by the indoor blower 10a in the indoor heat exchanger 10, and is condensed and liquefied. At this time, the indoor air is heated to perform heating. The condensed refrigerant in a liquid state flows into the expansion portion 9, and is expanded and decompressed in the expansion portion 9 to be in a gas-liquid two-phase state. Then, the gas-liquid two-phase refrigerant flows into the outdoor heat exchanger 8, exchanges heat with outdoor air in the outdoor heat exchanger 8, and is evaporated and gasified. The evaporated refrigerant in a gaseous state is sucked into the compressor 6 through the flow switching unit 7.
Next, the defrosting operation will be described. In the air conditioning apparatus 1, frost may adhere to the outdoor heat exchanger 8 during the heating operation. In order to remove this frost, a defrosting operation is performed. In the defrosting operation, the refrigerant sucked into the compressor 6 is compressed by the compressor 6 and discharged in a high-temperature and high-pressure gas state. The high-temperature and high-pressure gas refrigerant discharged from the compressor 6 flows into the outdoor heat exchanger 8 through the flow switching unit 7, and melts frost adhering to the outdoor heat exchanger 8. Then, the refrigerant is condensed and liquefied by heat exchange with outdoor air at the outdoor heat exchanger 8. The condensed refrigerant in a liquid state flows into the expansion portion 9. At this time, the expansion unit 9 is fully opened, and the refrigerant flows into the indoor heat exchanger 10 while maintaining a liquid state. Then, the refrigerant in the liquid state flows into the indoor heat exchanger 10, exchanges heat with the indoor air in the indoor heat exchanger 10, and is evaporated and gasified. The evaporated refrigerant in a gaseous state is sucked into the compressor 6 through the flow switching unit 7.
Fig. 3 is a flowchart showing the operation of the air conditioner 1 according to embodiment 1 of the present invention. Next, the operation of the control unit 30 of the air conditioner 1 according to embodiment 1 will be described. As shown in fig. 3, when the heating operation is started, the determination unit 32 determines whether or not the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold (step ST 1). When the temperature detected by the outdoor temperature detecting unit 21 is greater than the outdoor temperature threshold value (no in step ST1), it is determined that the temperature of the outdoor heat exchanger 8 detected by the outdoor heat-exchange temperature detecting unit 22 is equal to or less than the outdoor heat-exchange temperature threshold value (step ST 2). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature threshold value (yes in step ST2), the flow path switching unit 7 is switched by the switching member 34, and the defrosting operation is started. On the other hand, if the temperature of the outdoor heat exchanger 8 is greater than the outdoor heat exchange temperature threshold value (no in step ST2), the process returns to step ST 1.
Here, when the temperature detected by the outdoor temperature detector 21 is equal to or lower than the outdoor temperature threshold ("yes" at step ST1), the human body detector 24 detects the presence or absence of a human body (step ST 3). If a human being is detected (NO in step ST3), the process proceeds to step ST 2. On the other hand, when it is detected that no one is present (yes in step ST3), the changing means 33 changes the outdoor heat-exchange temperature threshold to an outdoor heat-exchange temperature relaxation threshold higher than the outdoor heat-exchange temperature threshold, and determines whether or not the temperature of the outdoor heat exchanger 8 detected by the outdoor heat-exchange temperature detecting unit 22 is equal to or lower than the outdoor heat-exchange temperature relaxation threshold (step ST 4). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature relaxation threshold value (yes in step ST4), the flow path switching unit 7 is switched by the switching member 34, and the defrosting operation is started. On the other hand, if the temperature of the outdoor heat exchanger 8 is greater than the outdoor heat exchange temperature relaxation threshold value (no in step ST4), the process returns to step ST 1.
In embodiment 1, the starting condition of the defrosting operation is changed based on the determination result of the operation information. Conventionally, there is known an air conditioner in which the starting condition of the defrosting operation is not changed, and the heat exchange capacity of the outdoor heat exchanger 8 is reduced without performing the defrosting operation even if the starting condition of the defrosting operation is satisfied as long as a person is present indoors. This makes it impossible to accurately judge whether or not the defrosting operation is performed. In contrast, in embodiment 1, the start condition of the defrosting operation is changed based on the determination result of the operation information, and therefore whether or not the defrosting operation is performed can be accurately determined. Further, conventionally, there is known an air conditioner which determines the start of the defrosting operation only based on whether or not there is a person, and in this case, if a setting is adopted which makes it easy to perform the defrosting operation when no person is present, if the outdoor temperature is high, the defrosting operation is frequently generated when defrosting is not originally required, and there is a possibility that the room temperature is lowered. In contrast, in embodiment 1, the start condition of the defrosting operation is changed based on the determination result of the operation information, and therefore, it is possible to suppress the occurrence of unnecessary defrosting operation, that is, excessive defrosting (japanese: empty defrosting り), frequently.
Further, the defrosting apparatus further includes a human body detecting section 24 for detecting the presence or absence of a human body, and the changing section 33 changes the starting condition of the defrosting operation based on the result of the determination by the determining section 32 and the result of the detection by the human body detecting section 24. Thus, the defrosting operation is actively performed in a case where the heating capacity is not required as in the case of no one being present, within a range where the excessive defrosting does not occur frequently. Thus, when a person is present indoors, the comfort of the user is not affected.
Further, the defrosting apparatus further includes an outdoor heat exchange temperature detecting unit 22, the outdoor heat exchange temperature detecting unit 22 detecting the temperature of the outdoor heat exchanger 8, and the starting conditions of the defrosting operation are: the changing means 33 changes the outdoor heat-exchange temperature threshold to an outdoor heat-exchange temperature relaxation threshold higher than the outdoor heat-exchange temperature threshold based on the operation information of the refrigerant circuit 5 when the temperature detected by the outdoor heat-exchange temperature detecting unit 22 is equal to or lower than the outdoor heat-exchange temperature threshold and the heating operation is performed. By determining the temperature of the outdoor heat exchanger 8 in this manner, whether or not defrosting is performed can be determined.
The defrosting apparatus further includes an outdoor temperature detecting unit 21, wherein the outdoor temperature detecting unit 21 detects an outdoor temperature, the operation information is a temperature detected by the outdoor temperature detecting unit 21, the determining means 32 determines whether or not the temperature detected by the outdoor temperature detecting unit 21 is equal to or less than an outdoor temperature threshold, and the changing means 33 changes the starting condition of the defrosting operation when the determining means 32 determines that the temperature detected by the outdoor temperature detecting unit 21 is equal to or less than the outdoor temperature threshold. By determining the outdoor temperature in this way, whether or not defrosting is performed can be determined with higher accuracy.
Fig. 4 is a block diagram showing the control unit 130 of the air conditioner 100 according to embodiment 2 of the present invention. Embodiment 2 is different from embodiment 1 in that the operation information is the operation frequency of the compressor 6. In embodiment 2, the same portions as those in embodiment 1 are denoted by the same reference numerals as those in embodiment 1, and description thereof is omitted, and differences from embodiment 1 will be mainly described.
As shown in fig. 4, the air conditioner 100 includes a frequency detector 125. The frequency detector 125 detects the operating frequency of the compressor 6. In embodiment 2, the operation information is the operation frequency detected by the frequency detecting unit 125. The determination unit 132 determines whether or not the operating frequency detected by the frequency detection unit 125 is equal to or greater than a frequency threshold. When the operating frequency of the compressor 6 is high, the amount of heat exchange in the outdoor heat exchanger 8 also increases, and therefore, it is estimated that the amount of frost rising in the outdoor heat exchanger 8 increases accordingly. As described above, when the operating frequency of the compressor 6 is high, it is determined that the frost is highly likely to adhere to the outdoor heat exchanger 8, and when the determining means 132 determines that the operating frequency detected by the frequency detecting unit 125 is equal to or higher than the frequency threshold value in order to facilitate the defrosting operation, the changing means 133 changes the outdoor heat exchange temperature threshold value to the outdoor heat exchange temperature relaxation threshold value higher than the outdoor heat exchange temperature threshold value.
In embodiment 2, the present invention further includes a frequency detection unit 125 that detects the operating frequency of the compressor 6, the operating information is the operating frequency detected by the frequency detection unit 125, the determination means 132 determines whether or not the operating frequency detected by the frequency detection unit 125 is equal to or greater than a frequency threshold, and the changing means 133 changes the starting condition of the defrosting operation when the determination means 132 determines that the operating frequency detected by the frequency detection unit 125 is equal to or greater than the frequency threshold. In this way, even if the operation frequency of the compressor 6 is set as the operation information, the same effect as that of embodiment 1 is obtained.
Fig. 5 is a block diagram showing a control unit 230 of an air conditioner 200 according to embodiment 3 of the present invention. Embodiment 3 is different from embodiments 1 and 2 in that the operation information is the operation time of the defrosting operation. In embodiment 3, the same portions as those in embodiments 1 and 2 are denoted by the same reference numerals as those in embodiments 1 and 2, and description thereof will be omitted, and differences from embodiments 1 and 2 will be mainly described.
As shown in fig. 5, the air conditioner 200 includes a time measurement unit 226. The time measuring unit 226 measures the operating time of the defrosting operation. In embodiment 3, the operation information is the operation time of the defrosting operation measured by the time measuring unit 226. The determination unit 232 determines whether or not the operation time of the previous defrosting operation measured by the time measuring unit 226 is equal to or longer than a time threshold. When the operation time of the previous defrosting operation is long, it is estimated that the amount of frost on the outdoor heat exchanger 8 is still increasing at present. As described above, when the operation time of the previous defrosting operation is long, it is determined that the frost is highly likely to be deposited on the outdoor heat exchanger 8, and when the determination means 232 determines that the operation time of the previous defrosting operation measured by the time measuring unit 226 is equal to or longer than the time threshold value in order to facilitate the defrosting operation, the change means 233 changes the outdoor heat exchange temperature threshold value to the outdoor heat exchange temperature relaxation threshold value higher than the outdoor heat exchange temperature threshold value.
In embodiment 3, the defrosting operation control apparatus further includes a time measuring unit 226 that measures an operation time of the defrosting operation, the operation information is the operation time measured by the time measuring unit 226, the determination unit 232 determines whether or not the operation time of the previous defrosting operation measured by the time measuring unit 226 is equal to or greater than a time threshold, and the start condition of the defrosting operation is changed when the determination unit 232 determines that the operation time of the previous defrosting operation measured by the time measuring unit 226 is equal to or greater than the time threshold. In this way, even if the operation information is the operation time of the defrosting operation, the same effects as those of embodiments 1 and 2 are obtained.
Embodiment 4.
Fig. 6 is a block diagram showing control unit 330 of air conditioner 300 according to embodiment 4 of the present invention. Embodiment 4 is different from embodiment 1 in that the control unit 330 includes a signal determination unit 335. In embodiment 4, the same portions as those in embodiments 1 to 3 are denoted by the same reference numerals as those in embodiments 1 to 3, and description thereof is omitted, and differences from embodiments 1 to 3 will be mainly described.
As shown in fig. 6, the control section 330 has a signal determination section 335. The signal determination unit 335 allows the start of the defrosting operation when receiving the stop signal from the remote controller 4, and continues the heating operation when not receiving the stop signal from the remote controller 4. In embodiment 4, the starting condition of the defrosting operation is changed based on the operation information, that is, the temperature detected by the outdoor temperature detector 21, and is not changed based on the detection result of the human body detector 24.
In embodiment 4, when the starting condition of the defrosting operation is changed, the defrosting operation is put on standby even when the starting condition of the defrosting operation is satisfied. When the stop signal is received by the use signal determining unit 335, the standby state of the defrosting operation is released, and the defrosting operation is started before the operation of the air conditioner 300 is stopped. On the other hand, when the stop signal is not received by the use signal determining unit 335, the operation of the air conditioner 300 is stopped while maintaining the stand-by state of the defrosting operation.
Fig. 7 is a flowchart showing the operation of air conditioner 300 according to embodiment 4 of the present invention. Next, the operation of the control unit 330 of the air conditioner 300 according to embodiment 4 will be described. As shown in fig. 7, when the heating operation is started, it is determined whether or not the temperature of the outdoor heat exchanger 8 detected by the outdoor heat-exchange temperature detecting unit 22 is equal to or lower than the outdoor heat-exchange temperature threshold (step ST 11). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature threshold value (yes in step ST11), the flow path switching unit 7 is switched by the switching member 34, and the defrosting operation is started.
On the other hand, when the temperature of the outdoor heat exchanger 8 is higher than the outdoor heat exchange temperature threshold value (no in step ST11), the determination unit 32 determines whether or not the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold value (step ST 12). When the temperature detected by the outdoor temperature detector 21 is higher than the outdoor temperature threshold value (no in step ST12), the signal determination unit 335 determines whether or not a stop signal has been received from the remote controller 4 (step ST 13). When the stop signal is received (yes at step ST13), the operation of air conditioner 300 is stopped. This is because the outdoor temperature is high, and therefore it is estimated that the outdoor heat exchanger 8 is not frosted. If the stop signal is not received (no in step ST13), the process returns to step ST 11.
In step ST12, when the temperature detected by the outdoor temperature detector 21 is equal to or lower than the outdoor temperature threshold value (yes in step ST12), the changing means 33 changes the outdoor heat exchange temperature threshold value to an outdoor heat exchange temperature relaxation threshold value higher than the outdoor heat exchange temperature threshold value, and determines whether or not the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detector 22 is equal to or lower than the outdoor heat exchange temperature relaxation threshold value (step ST 14). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature relaxation threshold value (yes at step ST14), the signal determination unit 335 determines whether or not a stop signal has been received from the remote controller 4 (step ST 15). When the stop signal is received (yes in step ST15), the flow path switching unit 7 is switched by the switching member 34, and the defrosting operation is started. Then, the operation of air conditioner 300 is stopped. If the stop signal is not received (no in step ST15), the process returns to step ST 11. This is because the outdoor temperature is low, and it is presumed that the outdoor heat exchanger 8 may frost.
On the other hand, when the temperature of the outdoor heat exchanger 8 is higher than the outdoor heat exchange temperature relaxation threshold value (no in step ST14), the signal determination unit 335 determines whether or not the stop signal has been received from the remote controller 4 (step ST 16). When the stop signal is received (yes at step ST16), the operation of air conditioner 300 is stopped. If the stop signal is not received (no in step ST16), the process returns to step ST 11. The reason is that: it is presumed that the outdoor heat exchanger 8 may be frosted due to a low outdoor temperature, but the user is expected to perform the heating operation because the stop signal is not received.
In embodiment 4, the air conditioner 300 further includes a remote controller 4, the remote controller 4 transmitting a stop signal for stopping the operation of the refrigerant circuit 5, and the control unit 330 further includes a signal determination unit 335, the signal determination unit 335 allowing the start of the defrosting operation when the stop signal is received from the remote controller 4, and the switching unit 34 causing the flow path switching unit 7 to switch to start the defrosting operation when the signal determination unit 335 allows the start of the defrosting operation. Thus, when the user does not need the heating operation, the defrosting operation is actively performed, and therefore, the heating capacity can be ensured when the reheating operation is needed. Therefore, in addition to the effect obtained by embodiment 1, the comfort of the user can be improved.
In embodiment 4, as in embodiment 1, the change of the defrosting operation start condition may be based not only on the operation information but also on the detection result of the human body detecting unit 24. In embodiment 4, the operation information may be the operation frequency of the compressor 6 as in embodiment 2, or may be the operation time of the defrosting operation as in embodiment 3.
Fig. 8 is a block diagram showing a control unit 430 of an air conditioner 400 according to embodiment 5 of the present invention. Embodiment 5 is different from embodiment 4 in that whether or not the signal determination unit 435 receives the temperature sensor off signal determines whether or not the defrosting operation is permitted. In embodiment 5, the same portions as those in embodiments 1 to 4 are denoted by the same reference numerals as those in embodiments 1 to 4, and description thereof is omitted, and differences from embodiments 1 to 4 will be mainly described.
As shown in fig. 8, the control section 430 has a signal judgment section 435. The signal determination unit 435 allows the start of the defrosting operation when receiving the temperature sensor off signal from the indoor unit 3, and continues the heating operation when not receiving the temperature sensor off signal. In embodiment 5, the starting condition of the defrosting operation is changed based on the operation information, that is, the temperature detected by the outdoor temperature detecting unit 21, and is not changed based on the detection result of the human body detecting unit 24.
In embodiment 5, when the starting condition of the defrosting operation is changed, the defrosting operation is put on standby even when the starting condition of the defrosting operation is satisfied. When the usage signal determination unit 435 receives the temperature sensor off signal, the standby state of the defrosting operation is released, and the defrosting operation is started before the operation of the air conditioner 400 is stopped. On the other hand, when the temperature sensor off signal is not received by the use signal determination unit 435, the standby state of the defrosting operation is maintained, and the operation of the air conditioner 400 is stopped while maintaining this state.
Fig. 9 is a flowchart showing the operation of the air conditioner 400 according to embodiment 5 of the present invention. Next, the operation of the control unit 430 of the air conditioner 400 according to embodiment 5 will be described. As shown in fig. 9, when the heating operation is started, it is determined whether or not the temperature of the outdoor heat exchanger 8 detected by the outdoor heat-exchange temperature detecting unit 22 is equal to or lower than the outdoor heat-exchange temperature threshold (step ST 21). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature threshold value (yes in step ST21), the flow path switching unit 7 is switched by the switching member 34, and the defrosting operation is started.
On the other hand, when the temperature of the outdoor heat exchanger 8 is higher than the outdoor heat exchange temperature threshold value (no in step ST21), the determination unit 32 determines whether or not the temperature detected by the outdoor temperature detection unit 21 is equal to or lower than the outdoor temperature threshold value (step ST 22). When the temperature detected by the outdoor temperature detector 21 is higher than the outdoor temperature threshold value (no in step ST22), the signal determination unit 435 determines whether or not the temperature sensor off signal has been received from the indoor unit 3 (step ST 23). When the temperature sensor off signal is received (yes in step ST23), the operation of the outdoor unit 2 and the indoor units 3 is stopped. This is because the outdoor temperature is high, and therefore it is estimated that the outdoor heat exchanger 8 is not frosted. If the temperature sensor off signal is not received (no in step ST23), the process returns to step ST 21.
In step ST22, when the temperature detected by the outdoor temperature detector 21 is equal to or lower than the outdoor temperature threshold value (yes in step ST22), the changing means 33 changes the outdoor heat exchange temperature threshold value to an outdoor heat exchange temperature relaxation threshold value higher than the outdoor heat exchange temperature threshold value, and determines whether or not the temperature of the outdoor heat exchanger 8 detected by the outdoor heat exchange temperature detector 22 is equal to or lower than the outdoor heat exchange temperature relaxation threshold value (step ST 24). When the temperature of the outdoor heat exchanger 8 is equal to or lower than the outdoor heat exchange temperature relaxation threshold value (yes in step ST24), the signal determination unit 435 determines whether or not the temperature sensor off signal has been received from the indoor unit 3 (step ST 25). When the temperature sensor off signal is received (yes in step ST25), the flow path switching unit 7 is switched by the switching member 34, and the defrosting operation is started. Then, the operation of the outdoor unit 2 and the indoor units 3 is stopped. If the temperature sensor off signal is not received (no in step ST25), the process returns to step ST 21. This is because the outdoor temperature is low, and therefore it is presumed that the outdoor heat exchanger 8 may frost.
On the other hand, when the temperature of the outdoor heat exchanger 8 is higher than the outdoor heat exchange temperature relaxation threshold value (no in step ST24), the signal determination unit 435 determines whether or not the temperature sensor off signal has been received from the indoor unit 3 (step ST 26). When the temperature sensor off signal is received (yes in step ST26), the operation of the outdoor unit 2 and the indoor units 3 is stopped. If the temperature sensor off signal is not received (no in step ST26), the process returns to step ST 21. The reason is that: it is estimated that the outdoor heat exchanger 8 may be frosted due to a low outdoor temperature, but it is estimated that the heating operation needs to be continued because the temperature sensor off signal is not received.
In embodiment 5, the control unit 430 further includes a signal determination unit 435, and the signal determination unit 435 allows the start of the defrosting operation when receiving a temperature sensor off signal that turns off the temperature sensor that is temporarily stopped when the actual room temperature is higher than the set temperature, and the switching unit 34 switches the flow path switching unit 7 to start the defrosting operation when the signal determination unit 435 allows the start of the defrosting operation. Thus, when the heating operation is not necessary, the defrosting operation is actively performed, and therefore, the heating capacity in the case where the heating operation is restarted by turning on the temperature sensor can be ensured. Therefore, in addition to the effect obtained by embodiment 1, the comfort of the user can be improved.
In embodiment 5, the change of the defrosting operation start condition may be based not only on the operation information but also on the detection result of the human body detecting unit 24, as in embodiment 1. In embodiment 5, the operation information may be the operation frequency of the compressor 6 as in embodiment 2, or may be the operation time of the defrosting operation as in embodiment 3.
Description of the reference numerals
1. An air conditioning device; 2. an outdoor unit; 3. an indoor unit; 4. a remote controller; 4a, a remote control line; 5. a refrigerant circuit; 6. a compressor; 7. a flow path switching unit; 8. an outdoor heat exchanger; 8a, an outdoor blower; 9. an expansion part; 10. an indoor heat exchanger; 10a, an indoor blower; 21. an outdoor temperature detection unit; 22. an outdoor heat exchange temperature detection unit; 23. an indoor temperature detection unit; 24. a human body detection unit; 30. a control unit; 30a, an outdoor control substrate; 30b, a room control substrate; 30c, an internal and external communication line; 31. a storage section; 32. a determination unit; 33. a changing means; 34. a switching member; 100. an air conditioning device; 125. a frequency detection unit; 130. a control unit; 132. a determination unit; 133. a changing means; 200. an air conditioning device; 226. a time measuring section; 230. a control unit; 232. a determination unit; 233. a changing means; 300. an air conditioning device; 330. a control unit; 335. a signal judgment section; 400. an air conditioning device; 430. a control unit; 435. and a signal judging section.
Claims (8)
1. An air conditioning apparatus, wherein,
the air conditioning device includes:
a refrigerant circuit in which a compressor, a flow path switching unit, an outdoor heat exchanger, an expansion unit, and an indoor heat exchanger are connected by piping, and through which a refrigerant flows; and
a control unit that controls an operation of the refrigerant circuit to switch between a heating operation and a defrosting operation,
the control unit includes:
a determination unit that determines whether or not to change a starting condition of the defrosting operation based on operation information of the refrigerant circuit when the heating operation is performed;
a changing unit that changes the starting condition of the defrosting operation when the determining unit determines that the starting condition needs to be changed and the heating operation is not estimated to be necessary, and does not change the starting condition of the defrosting operation when the determining unit determines that the starting condition needs to be changed and the heating operation is estimated to be necessary; and
and a switching means that switches the flow path switching unit to start the defrosting operation when the defrosting operation start condition is satisfied.
2. The air conditioner according to claim 1,
the air conditioning device also comprises a human body detection part which detects whether a human body exists or not,
the changing means changes the starting condition of the defrosting operation based on the determination result of the determining means and based on the detection result of the human body detecting portion.
3. The air conditioner according to claim 1,
the air conditioner further includes a remote controller that transmits a stop signal for stopping the operation of the refrigerant circuit,
the control unit further includes a signal determination unit that allows the start of the defrosting operation when the stop signal is received from the remote controller,
when the signal determination means permits the start of the defrosting operation, the switching means switches the flow path switching portion to start the defrosting operation.
4. The air conditioner according to claim 1,
the control unit further includes a signal determination unit that allows the start of the defrosting operation when receiving a temperature sensor off signal that turns off the temperature sensor that is temporarily stopped when the actual room temperature is higher than a set temperature,
when the signal determination means permits the start of the defrosting operation, the switching means switches the flow path switching portion to start the defrosting operation.
5. The air conditioning device according to any one of claims 1 to 4,
the air conditioning device further includes an outdoor heat exchange temperature detection section that detects a temperature of the outdoor heat exchanger,
the starting conditions of the defrosting operation are: the temperature detected by the outdoor heat exchange temperature detection part is below the outdoor heat exchange temperature threshold value,
when the heating operation is performed, the changing means changes the outdoor heat-exchange temperature threshold to an outdoor heat-exchange temperature relaxation threshold higher than the outdoor heat-exchange temperature threshold, based on operation information of the refrigerant circuit.
6. The air conditioning device according to any one of claims 1 to 4,
the air conditioner further includes an outdoor temperature detecting part which detects an outdoor temperature,
the operation information is a temperature detected by the outdoor temperature detecting unit,
the determination means determines whether or not the temperature detected by the outdoor temperature detection unit is equal to or lower than an outdoor temperature threshold value,
the changing means changes the starting condition of the defrosting operation when the determining means determines that the temperature detected by the outdoor temperature detecting section is equal to or lower than the outdoor temperature threshold.
7. The air conditioning device according to any one of claims 1 to 4,
the air conditioner further includes a frequency detection unit that detects an operating frequency of the compressor,
the operation information is the operation frequency detected by the frequency detecting unit,
the judging means judges whether or not the operating frequency detected by the frequency detecting section is equal to or higher than a frequency threshold,
the changing means changes the starting condition of the defrosting operation when the determining means determines that the operating frequency detected by the frequency detecting section is equal to or greater than a frequency threshold.
8. The air conditioning device according to any one of claims 1 to 4,
the air conditioning apparatus further includes a time measuring section that measures an operation time of the defrosting operation,
the operation information is an operation time measured by the time measuring unit,
the judging means judges whether or not the operation time of the previous defrosting operation measured by the time measuring section is equal to or longer than a time threshold,
when the determination means determines that the operation time of the previous defrosting operation measured by the time measuring unit is equal to or longer than a time threshold, the start condition of the defrosting operation is changed.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2016/053458 WO2017134807A1 (en) | 2016-02-05 | 2016-02-05 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108603706A CN108603706A (en) | 2018-09-28 |
| CN108603706B true CN108603706B (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201680079374.4A Active CN108603706B (en) | 2016-02-05 | 2016-02-05 | Air conditioner |
Country Status (5)
| Country | Link |
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| US (1) | US20180356138A1 (en) |
| EP (1) | EP3412992B1 (en) |
| JP (1) | JP6611829B2 (en) |
| CN (1) | CN108603706B (en) |
| WO (1) | WO2017134807A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3698088B1 (en) * | 2017-10-17 | 2024-02-21 | Swegon Operations AB | An air handling unit for a ventilation system in a building and a method for performing a defrosting operation of an air handling unit |
| SE542349E (en) * | 2017-10-17 | 2023-09-12 | Swegon Operations Ab | Method for defrosting of an Air Handling Unit |
| EP3617028A4 (en) * | 2017-12-27 | 2021-01-20 | CRRC Changchun Railway Vehicles Co., Ltd. | Rail train and air conditioning control system thereof |
| CN109458698A (en) * | 2018-11-08 | 2019-03-12 | 珠海格力电器股份有限公司 | Air-conditioning defrosting method and air-conditioning |
| JP7199529B2 (en) * | 2019-05-28 | 2023-01-05 | 三菱電機株式会社 | Control device, air environment adjustment system, air environment adjustment method, program, and recording medium |
| CN110173824B (en) * | 2019-05-31 | 2021-05-18 | 广东美的制冷设备有限公司 | Operation control method, control device, air conditioner, and computer-readable storage medium |
| CN112665116B (en) * | 2019-10-16 | 2022-04-12 | 广东美的制冷设备有限公司 | Multi-online defrosting method and device, multi-online air conditioning system and readable storage medium |
| DE102020122996A1 (en) * | 2020-09-03 | 2022-03-03 | Vaillant Gmbh | Method for defrosting a component exposed to the ambient air and devices for carrying out the method |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP3412992A1 (en) | 2018-12-12 |
| JPWO2017134807A1 (en) | 2018-09-13 |
| EP3412992B1 (en) | 2024-06-05 |
| CN108603706A (en) | 2018-09-28 |
| EP3412992A4 (en) | 2019-02-13 |
| WO2017134807A1 (en) | 2017-08-10 |
| JP6611829B2 (en) | 2019-11-27 |
| US20180356138A1 (en) | 2018-12-13 |
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