WO2020189586A1 - Dispositif à cycle de réfrigération - Google Patents

Dispositif à cycle de réfrigération Download PDF

Info

Publication number
WO2020189586A1
WO2020189586A1 PCT/JP2020/011286 JP2020011286W WO2020189586A1 WO 2020189586 A1 WO2020189586 A1 WO 2020189586A1 JP 2020011286 W JP2020011286 W JP 2020011286W WO 2020189586 A1 WO2020189586 A1 WO 2020189586A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat exchanger
refrigerant
compressor
control
outdoor heat
Prior art date
Application number
PCT/JP2020/011286
Other languages
English (en)
Japanese (ja)
Inventor
広司 中島
陽 冨山
Original Assignee
ダイキン工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Publication of WO2020189586A1 publication Critical patent/WO2020189586A1/fr

Links

Images

Classifications

    • 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
    • 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
    • F24F11/42—Defrosting; Preventing freezing of outdoor units
    • 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

Definitions

  • This disclosure relates to a refrigeration cycle device.
  • frost adheres to the outdoor heat exchanger during heating operation in which the outdoor heat exchanger functions as a refrigerant evaporator and the indoor heat exchanger functions as a refrigerant radiator. Therefore, a defrost operation is performed to melt the frost.
  • Patent Document 1 International Publication No. 2015/162696
  • An air conditioner has been proposed in which either defrost operation using a gas bypass circuit or reverse cycle defrost operation is selected and executed.
  • the hot gas bypass defrost operation in which the refrigerant discharged from the compressor is sent to the outdoor heat exchanger via the hot gas bypass circuit and the refrigerant discharged from the compressor are switched in four ways. Either of the reverse cycle defrost operation, which is sent to the outdoor heat exchanger via the valve, is selected and executed according to the amount of frost formed in the outdoor heat exchanger.
  • the hot gas bypass defrost operation and the reverse cycle defrost operation are selectively executed, but when the reverse cycle defrost operation is selected and executed, it is outdoors.
  • the frost on the downstream side of the refrigerant flow in the heat exchanger may remain undissolved.
  • the contents of the present disclosure are intended to provide a refrigeration cycle apparatus capable of sufficiently melting the frost adhering to the outdoor heat exchanger.
  • the refrigeration cycle device includes a refrigerant circuit and a control unit.
  • a compressor, an outdoor heat exchanger, an expansion mechanism, and an indoor heat exchanger are connected in this order.
  • Refrigerant circulates inside the refrigerant circuit.
  • the refrigerant circuit has a switching valve. The switching valve can switch between the first state and the second state. In the first state, the refrigerant discharged from the compressor flows through the indoor heat exchanger to make the indoor heat exchanger function as a radiator. In the second state, the refrigerant discharged from the compressor flows through the outdoor heat exchanger to make the outdoor heat exchanger function as a radiator.
  • the refrigerant circuit has a bypass pipe.
  • the bypass pipe connects between the discharge side of the compressor and the switching valve, between the outdoor heat exchanger and the expansion mechanism, or a portion of the outdoor heat exchanger close to the expansion mechanism.
  • the control unit performs the first control when defrosting the outdoor heat exchanger, and performs the second control after the first control.
  • the first control in the first state, the refrigerant discharged from the compressor is sent to the indoor heat exchanger, and the refrigerant is sent from the compressor to the outdoor heat exchanger via the bypass pipe.
  • the second control switches the switching valve to the second state and sends the refrigerant from the compressor to the outdoor heat exchanger.
  • the part closer to the expansion mechanism in the outdoor heat exchanger means that the effective length of the refrigerant path through which the refrigerant flows in the outdoor heat exchanger is closer to the expansion mechanism than the center.
  • This refrigeration cycle apparatus melts the frost in the part of the outdoor heat exchanger near the expansion mechanism by performing the first control of sending the refrigerant from the compressor to the frosted outdoor heat exchanger via the bypass pipe. Can be done. Furthermore, by switching the switching valve to the second state and performing the second control to defrost the outdoor heat exchanger by sending the refrigerant from the compressor to the outdoor heat exchanger, it becomes the expansion mechanism of the outdoor heat exchanger. Frost can be melted from the near part to the far part. This makes it possible to sufficiently melt the frost adhering to the outdoor heat exchanger.
  • the refrigeration cycle device is the refrigeration cycle device according to the first aspect, and the refrigerant circuit further has a control valve.
  • the control valve is provided in the middle of the bypass pipe.
  • This refrigeration cycle device can control the flow of refrigerant in the bypass piping by controlling the control valve.
  • the refrigeration cycle device is the refrigeration cycle device according to the second aspect, and the control valve is an expansion valve whose valve opening degree can be adjusted.
  • This refrigeration cycle device can control the flow rate of the refrigerant in the bypass pipe by adjusting the opening degree of the control valve, so that the refrigerant required for melting the frost can flow.
  • the refrigeration cycle device is the refrigeration cycle device of the second aspect or the third aspect, and the control unit closes the control valve while performing the second control.
  • closing the control valve while performing the second control means closing the control valve at the same time as the start of the second control, or closing the control valve after the start of the second control and before the end of the second control. included.
  • the flow of the refrigerant in the bypass pipe is restricted by closing the control valve during the second control, so that the frost melts in the part of the outdoor heat exchanger far from the part near the expansion mechanism. Can be done efficiently.
  • the refrigerating cycle device is the refrigerating cycle device according to the fourth aspect, and the control unit opens the closed control valve when a predetermined protection condition is satisfied during the second control. ..
  • the prescribed protection conditions are not particularly limited.
  • the predetermined protection condition for example, the temperature of the refrigerant discharged from the compressor, the temperature of the refrigerant sucked into the compressor, and the like may be equal to or less than a predetermined value.
  • This refrigeration cycle device makes it possible to suppress an abnormality in the temperature of the refrigerant discharged from the compressor and the occurrence of liquid compression in the compressor during the second control.
  • the refrigeration cycle apparatus is any refrigeration cycle apparatus from the first aspect to the fifth aspect, and the control unit is a third control for lowering the rotation speed of the compressor while performing the first control. I do.
  • this refrigeration cycle device can reduce the switching noise that may occur in the switching valve when the switching valve is switched to the second state by using the pressure difference of the refrigerant circuit. ..
  • this refrigeration cycle device can reduce the switching noise that may occur in the switching valve when the switching valve is switched to the second state by using the pressure difference of the refrigerant circuit. ..
  • by performing the first control using the time required to reduce the rotation speed of the compressor it is possible to start the second control at an early stage while suppressing the switching sound of the switching valve to be small. ..
  • the refrigeration cycle device is any of the refrigeration cycle devices from the first aspect to the fifth aspect, and the control unit performs the fourth control while performing the first control.
  • the fourth control the rotation speed of the compressor is reduced after maintaining the rotation speed of the compressor.
  • This refrigeration cycle device is provided with a step of maintaining the rotation speed of the compressor before lowering the rotation speed of the compressor during the first control.
  • the refrigeration cycle device is any of the refrigeration cycle devices from the first viewpoint to the seventh viewpoint, and the expansion mechanism is an expansion valve whose valve opening degree can be adjusted.
  • the control unit controls the valve opening of the expansion mechanism to be smaller than the valve opening during operation immediately before the first control.
  • control for making the valve opening of the expansion mechanism smaller than the valve opening during operation immediately before the first control is not particularly limited.
  • the control may be smaller than the fixed opening degree.
  • such a control may be a control that is smaller than the control opening degree when the valve opening degree of the expansion mechanism is controlled during the operation immediately before the first control.
  • the opening degree may be smaller than the target valve opening degree by controlling the expansion mechanism immediately before the first control.
  • the valve opening of the expansion mechanism is controlled to be smaller than the valve opening during the operation immediately before the first control, so that the indoor heat exchanger is used via the expansion mechanism.
  • the amount of refrigerant flowing toward the outdoor heat exchanger is suppressed.
  • the refrigeration cycle device is any of the refrigeration cycle devices from the first aspect to the eighth aspect, and further includes a refrigerant temperature sensor.
  • the refrigerant temperature sensor detects the temperature of the refrigerant flowing in a portion close to the expansion mechanism in the outdoor heat exchanger or the temperature of the refrigerant flowing between the outdoor heat exchanger and the expansion mechanism.
  • the control unit ends the second control when a predetermined time elapses from the start of the second control and the detection value of the refrigerant temperature sensor satisfies the predetermined end condition.
  • This refrigeration cycle device determines the predetermined end condition by using the value detected by the refrigerant temperature sensor after a predetermined time has elapsed from the start of the second control. Therefore, it is possible to prevent the predetermined end condition from being satisfied when the first control is being performed.
  • the refrigeration cycle apparatus is any of the refrigeration cycle apparatuss from the first aspect to the ninth aspect, and the outdoor heat exchanger has a flat heat transfer tube containing aluminum or an aluminum alloy. ..
  • the refrigeration cycle apparatus is any refrigeration cycle apparatus from the first aspect to the tenth aspect, and the outdoor heat exchanger is the first transmission in which a plurality of heat transfer tubes are arranged side by side in the vertical direction. It has a heat tube group and a second heat transfer tube group. The first heat transfer tube group and the second heat transfer tube group are arranged side by side in the horizontal direction.
  • This refrigeration cycle device also suppresses the undissolved frost in the part of the outdoor heat exchanger near the expansion mechanism, even for the outdoor heat exchanger in which the refrigerant flows sequentially through the first heat transfer tube group and the second heat transfer tube group. Becomes possible.
  • FIG. 1 is a schematic configuration diagram of the refrigerant circuit
  • FIG. 2 is a schematic control block configuration diagram.
  • the air conditioning device 1 is a device that harmonizes the air in the target space by performing a vapor compression refrigeration cycle.
  • the air conditioner 1 mainly serves as an outdoor unit 20, an indoor unit 30, a liquid side refrigerant connecting pipe 6 and a gas side refrigerant connecting pipe 5 connecting the outdoor unit 20 and the indoor unit 30, and an input device and an output device. It has a remote controller 8 and a controller 7 that controls the operation of the air conditioner 1.
  • a refrigeration cycle is performed in which the refrigerant sealed in the refrigerant circuit 10 is compressed, dissipated (condensed), depressurized, evaporated, and then compressed again.
  • the refrigerant circuit 10 is filled with a refrigerant for performing a vapor compression refrigeration cycle.
  • Outdoor unit 20 The outdoor unit 20 is connected to the indoor unit 30 via a liquid-side refrigerant connecting pipe 6 and a gas-side refrigerant connecting pipe 5, and constitutes a part of the refrigerant circuit 10.
  • the outdoor unit 20 mainly includes a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an outdoor expansion valve 24, a low pressure receiver 26, an outdoor fan 25, a liquid side closing valve 29, and a gas. It has a side closing valve 28 and a bypass pipe 48.
  • the compressor 21 is a device that compresses the low-pressure refrigerant in the refrigeration cycle until it reaches a high pressure.
  • a compressor in which a rotary type or scroll type compression element (not shown) is rotationally driven by a compressor motor is used.
  • the compressor motor is for changing the capacity, and the rotation speed can be controlled by an inverter.
  • the four-way switching valve 22 connects the suction side of the compressor 21 and the gas side closing valve 28 while connecting the discharge side of the compressor 21 and the outdoor heat exchanger 23 by switching the connection state in the refrigerant circuit 10. Heating operation connection between the cooling operation connection state (see the solid line in FIG. 1) and the suction side of the compressor 21 and the outdoor heat exchanger 23 while connecting the discharge side of the compressor 21 and the gas side closing valve 28. The state (see the dotted line in FIG. 1) can be switched. More specifically, the four-way switching valve 22 has a discharge pipe 47 extending from the discharge side of the compressor 21 to one of the connection ports of the four-way switching valve 22 and the outdoor heat exchanger 23 in the cooling operation connection state.
  • a second pipe 42 extending from one of the ports to the low pressure receiver 26 is connected.
  • the four-way switching valve 22 connects the third pipe 43 and the second pipe 42 while connecting the discharge pipe 47 and the first pipe 41 in the heating operation connected state.
  • the outdoor heat exchanger 23 is a heat exchanger that functions as a radiator or a condenser of a high-pressure refrigerant in a refrigeration cycle during a cooling operation and as an evaporator of a low-pressure refrigerant in a refrigeration cycle during a heating operation.
  • the outdoor fan 25 supplies the outdoor air into the outdoor unit 20 to the outdoor heat exchanger 23, exchanges heat with the refrigerant in the outdoor heat exchanger 23, and then discharges the air flow to the outside of the outdoor unit 20. Give rise.
  • the outdoor fan 25 is rotationally driven by an outdoor fan motor.
  • the outdoor expansion valve 24 is provided between the liquid side end of the outdoor heat exchanger 23 and the liquid side closing valve 29. More specifically, the outdoor expansion valve 24 is provided between the fourth pipe 44 extending from the gas side end of the outdoor heat exchanger 23 and the fifth pipe 45 extending from the liquid side closing valve 29. ..
  • the outdoor expansion valve 24 for example, an electric expansion valve whose valve opening degree can be adjusted by control can be used.
  • the low pressure receiver 26 is provided between the suction side of the compressor 21 and one of the connection ports of the four-way switching valve 22. Inside the low pressure receiver 26, the end of the second pipe 42 extending from one of the connection ports of the four-way switching valve 22 and the end of the suction pipe 46 extending from the suction side of the compressor 21 are located. There is.
  • the low pressure receiver 26 is a refrigerant container capable of storing the surplus refrigerant in the refrigerant circuit 10 as a liquid refrigerant.
  • the liquid side closing valve 29 is a manual valve arranged at a connection portion with the liquid side refrigerant connecting pipe 6 in the outdoor unit 20.
  • the gas side closing valve 28 is a manual valve arranged in the outdoor unit 20 at the connection portion with the gas side refrigerant connecting pipe 5.
  • the bypass pipe 48 constitutes a refrigerant path connecting the discharge pipe 47 and the fourth pipe 44.
  • a capillary tube 48a that functions as a decompression unit for the passing refrigerant is provided in the middle of the bypass pipe 48.
  • a bypass valve 49 which is an electromagnetic on-off valve whose opening and closing is controlled, is provided between the branch portion from the discharge pipe 47 and the capillary tube 48a.
  • the outdoor unit 20 has an outdoor unit control unit 27 that controls the operation of each unit constituting the outdoor unit 20.
  • the outdoor unit control unit 27 has a microcomputer including a CPU, a memory, and the like.
  • the outdoor unit control unit 27 is connected to the indoor unit control unit 34 of each indoor unit 30 via a communication line, and transmits and receives control signals and the like.
  • the outdoor unit 20 is provided with a discharge temperature sensor 83, a suction temperature sensor 84, an outdoor heat exchange temperature sensor 85, an outside air temperature sensor 86, and the like. Each of these sensors is electrically connected to the outdoor unit control unit 27, and transmits a detection signal to the outdoor unit control unit 27.
  • the discharge temperature sensor 83 detects the temperature of the refrigerant flowing through the discharge pipe 47.
  • the suction temperature sensor 84 detects the temperature of the refrigerant flowing through the suction pipe 46.
  • the outdoor heat exchange temperature sensor 85 detects the temperature of the refrigerant flowing through the outlet on the liquid side.
  • the outside air temperature sensor 86 detects the outdoor air temperature before passing through the outdoor heat exchanger 23.
  • FIG. 3 shows an external perspective view of the outdoor heat exchanger 23
  • FIG. 4 shows an explanatory view showing a state of the refrigerant flowing through the outdoor heat exchanger 23 in the cooling operation connected state.
  • the outdoor heat exchanger 23 has a heat exchange unit 50, a gas side header 54, a liquid side header 56, a first folded header 53, and a second folded header 55. All of these elements of the outdoor heat exchanger 23 are made of aluminum or an aluminum alloy.
  • the heat exchange unit 50 is arranged on the downstream side in the air flow direction away from the first heat exchange unit 51 and the first heat exchange unit 51 formed on the upstream side in the air flow direction formed by the outdoor fan 25. It also has a second heat exchange unit 52.
  • the first heat exchange unit 51 and the second heat exchange unit 52 are arranged so as to overlap each other in the air flow direction.
  • the first heat exchange unit 51 has a first upper heat exchange unit 51a and a first lower heat exchange unit 51b located below the first upper heat exchange unit 51a.
  • the second heat exchange unit 52 has a second upper heat exchange unit 52a and a second lower heat exchange unit 52b located below the second upper heat exchange unit 52a.
  • the first heat exchange unit 51 and the second heat exchange unit 52 each have a plurality of flat multi-hole tubes 48 and a plurality of heat transfer fins 59.
  • the plurality of flat multi-hole pipes 58 are arranged side by side in the vertical direction with the flat surface 58a facing the vertical direction.
  • the flat multi-hole pipe 58 has a plurality of refrigerant flow paths 58b configured side by side along the air flow direction.
  • the plurality of heat transfer fins 59 are fixed to the plurality of flat multi-hole tubes.
  • the heat transfer fin 59 has a notch 59a for inserting and fixing the flat multi-hole tube 58.
  • the gas side header 54 is provided so as to connect the third pipe 43 and the first upper heat exchange unit 51a. Specifically, one end of the third pipe 43 is connected to the gas side header 54, and one end of the plurality of flat multi-hole pipes 58 included in the first upper heat exchange portion 51a is connected to the gas side header 54, respectively. There is.
  • the liquid side header 56 is provided so as to connect the fourth pipe 44 and the first lower heat exchange section 51b. Specifically, one end of the fourth pipe 44 is connected to the liquid side header 56, and one end of the plurality of flat multi-hole pipes 58 included in the first lower heat exchange portion 51b is connected to the liquid side header 56, respectively. There is.
  • the first folded header 53 has a first upper folded header 53a and a first downward folded header 53b.
  • the first upper heat exchange header 53a is an end of the first upper heat exchange portion 51a opposite to the gas side header 54 side and an end of the second upper heat exchange portion 52a opposite to the second folded header 55 side. It is provided to contact the department.
  • the first upper folded header 53a of the present embodiment includes a plurality of flat multi-hole pipes 58 of the first upper heat exchange portion 51a and a plurality of flat multi-hole pipes 58 of the second upper heat exchange portion 52a. , Are configured to communicate with each other at the same height position.
  • the first lower heat exchange header 53b has an end of the first lower heat exchange portion 51b opposite to the liquid side header 56 side and an end of the second lower heat exchange portion 52b opposite to the second folded header 55 side. It is provided to contact the department.
  • the first lower folded header 53b of the present embodiment includes a plurality of flat multi-hole pipes 58 of the first lower heat exchange portion 51b and a plurality of flat multi-hole pipes 58 of the second lower heat exchange portion 52b. , Are configured to communicate with each other at the same height position.
  • the second folded header 55 is provided so as to connect the second upper heat exchange unit 52a and the second lower heat exchange unit 52b.
  • the internal space of the second folded header 55 is separated for each height position, and the spaces separated from each other are connected to each other via a plurality of connecting pipes 55a.
  • the refrigerant flows in the direction indicated by the arrow in FIGS. 3 and 4.
  • the refrigerant flowing into the gas side header 54 from the third pipe 43 is diverted in the height direction in the gas side header 54, and is a flat multi-hole pipe at each height position of the first upper heat exchange portion 51a. It flows to 58.
  • the refrigerant that has flowed through the first upper heat exchange section 51a flows into the flat multi-hole pipe 58 at each height position of the second upper heat exchange section 52a while maintaining the height position in the first upper folded header 53a.
  • the refrigerant that has flowed through the second upper heat exchange section 52a flows through the second folded header 55 into the flat multi-hole pipe 58 at each height position of the second lower heat exchange section 52b.
  • the refrigerant that has flowed through the second lower heat exchange section 52b flows into the flat multi-hole pipe 58 at each height position of the first lower heat exchange section 51b while maintaining the height position in the first lower folded header 53b.
  • the refrigerant that has flowed through the first lower heat exchange section 51b merges with the liquid side header 56 and flows into the fourth pipe 44.
  • the indoor unit 30 is installed on the wall surface, ceiling, or the like of the room, which is the target space.
  • the indoor unit 30 is connected to the outdoor unit 20 via a liquid-side refrigerant connecting pipe 6 and a gas-side refrigerant connecting pipe 5, and constitutes a part of the refrigerant circuit 10.
  • the indoor unit 30 has an indoor heat exchanger 31 and an indoor fan 32.
  • the liquid side of the indoor heat exchanger 31 is connected to the liquid side refrigerant connecting pipe 6, and the gas side end is connected to the gas side refrigerant connecting pipe 5.
  • the indoor heat exchanger 31 is a heat exchanger that functions as an evaporator of the low-pressure refrigerant in the refrigeration cycle during the cooling operation and as a radiator or a condenser of the high-pressure refrigerant in the refrigeration cycle during the heating operation.
  • the indoor fan 32 sucks the indoor air, which is the space to be air-conditioned, into the indoor unit 30, exchanges heat with the refrigerant in the indoor heat exchanger 31, and then discharges the air flow to the outside of the indoor unit 30. Give rise.
  • the indoor fan 32 is rotationally driven by the indoor fan motor.
  • the indoor unit 30 has an indoor unit control unit 34 that controls the operation of each unit constituting the indoor unit 30.
  • the indoor unit control unit 34 has a microcomputer including a CPU, a memory, and the like.
  • the indoor unit control unit 34 is connected to the outdoor unit control unit 27 via a communication line, and transmits and receives control signals and the like.
  • the indoor unit 30 is provided with an indoor liquid side heat exchange temperature sensor 91, an indoor air temperature sensor 92, and the like. Each of these sensors is electrically connected to the indoor unit control unit 34, and transmits a detection signal to the indoor unit control unit 34.
  • the indoor liquid side heat exchange temperature sensor 91 detects the temperature of the refrigerant flowing through the liquid side outlet on the side opposite to the side to which the gas side refrigerant connecting pipe 5 is connected in the indoor heat exchanger 31.
  • the indoor air temperature sensor 92 detects the indoor air temperature before passing through the indoor heat exchanger 31.
  • Controller 7 In the air conditioner 1, a controller 7 that controls the operation of the air conditioner 1 is configured by connecting the outdoor unit control unit 27 and the indoor unit control unit 34 via a communication line.
  • the controller 7 mainly has a CPU (Central Processing Unit) and memories such as ROM and RAM. It should be noted that various processes and controls by the controller 7 are realized by the functions of the outdoor unit control unit 27 and / or the indoor unit control unit 34 in an integrated manner.
  • CPU Central Processing Unit
  • ROM Read Only Memory
  • RAM Random Access Memory
  • the remote controller 8 is arranged in a room which is an air-conditioned space or a specific space of a building including the air-conditioned space, and is used by a user or the like to perform an operation control command of the air conditioner 1 and monitor an operating state. ..
  • a cooling operation mode and a heating operation mode are provided.
  • the controller 7 determines whether it is the cooling operation mode or the heating operation mode based on the instruction received from the remote controller 8, and executes it.
  • Cooling operation mode In the cooling operation mode, the air conditioner 1 sets the four-way switching valve 22 in the cooling operation connected state and executes the cooling operation.
  • the rotation speed of the compressor 21 is controlled so that, for example, the evaporation temperature of the refrigerant in the refrigerant circuit 10 reaches the target evaporation temperature.
  • the bypass valve 49 is closed during the cooling operation.
  • the gas refrigerant discharged from the compressor 21 flows through the discharge pipe 47, the four-way switching valve 22, and the third pipe 43, and flows into the outdoor heat exchanger 23.
  • the refrigerant flowing through the outdoor heat exchanger 23 dissipates heat or condenses by exchanging heat with the outdoor air, and flows toward the outdoor expansion valve 24.
  • valve opening degree of the outdoor expansion valve 24 is controlled so as to satisfy a predetermined condition such that the degree of supercooling of the refrigerant flowing through the liquid side outlet of the outdoor heat exchanger 23 becomes a target value.
  • the refrigerant decompressed by the outdoor expansion valve 24 flows into the indoor unit 30 via the liquid side closing valve 29 and the liquid side refrigerant connecting pipe 6, and evaporates in the indoor heat exchanger 31.
  • the refrigerant evaporated in the indoor heat exchanger 31 flows into the outdoor unit 20 from the gas side closing valve 28 via the gas side refrigerant connecting pipe 5.
  • the refrigerant flowing into the outdoor unit 20 is sucked into the compressor 21 again through the second pipe 42, the four-way switching valve 22, the first pipe 41, the low pressure receiver 26, and the suction pipe 46.
  • the liquid refrigerant that could not be completely evaporated in the indoor heat exchanger 31 is stored as a surplus refrigerant.
  • (2-2) Heating operation mode In the heating operation mode, the air conditioner 1 executes while switching between the heating operation and the defrost operation.
  • the number of revolutions of the compressor 21 is controlled so as to generate a predetermined capacity, for example.
  • the rotation speed is controlled so that the condensation temperature of the refrigerant in the refrigerant circuit 10 reaches the target condensation temperature.
  • the bypass valve 49 is closed during the cooling operation.
  • the gas refrigerant discharged from the compressor 21 flows into the indoor unit 30 after flowing through the discharge pipe 47, the four-way switching valve 22, the second pipe 42, and the gas-side refrigerant connecting pipe 5.
  • the refrigerant that has flowed into the indoor unit 30 flows into the indoor heat exchanger 31 and exchanges heat with the indoor air in the indoor heat exchanger 31 to dissipate heat or condense.
  • the refrigerant radiated or condensed by the indoor heat exchanger 31 flows into the outdoor unit 20 from the liquid side closing valve 29 via the liquid side refrigerant connecting pipe 6.
  • the refrigerant that has flowed into the outdoor unit 20 is depressurized by the outdoor expansion valve 24.
  • valve opening degree of the outdoor expansion valve 24 is controlled so as to satisfy a predetermined condition such that the degree of supercooling of the refrigerant flowing through the liquid side outlet of the indoor heat exchanger 31 becomes a target value.
  • the refrigerant decompressed by the outdoor expansion valve 24 flows into the outdoor heat exchanger 23 and evaporates by exchanging heat with the outdoor air.
  • the refrigerant evaporated in the outdoor heat exchanger 23 is sucked into the compressor 21 again through the third pipe 43, the four-way switching valve 22, the first pipe 41, the low pressure receiver 26, and the suction pipe 46.
  • the low pressure receiver 26 the liquid refrigerant that could not be completely evaporated in the outdoor heat exchanger 23 is stored as a surplus refrigerant.
  • the defrost operation is performed to melt the frost adhering to the outdoor heat exchanger 23.
  • the bypass valve 49 is opened while maintaining the connection state of the four-way switching valve 22 in the heating operation connection state, and the refrigerant discharged from the compressor 21 is bypassed.
  • the hot gas bypass defrost operation of sending to the outdoor heat exchanger 23 via 48 is performed.
  • connection state of the four-way switching valve 22 is switched from the heating operation connection state to the cooling operation connection state, and the reverse cycle defrost operation is performed in which the refrigerant discharged from the compressor 21 is sent to the outdoor heat exchanger 23. Further, when the predetermined defrost end condition is satisfied, the connection state of the four-way switching valve 22 is returned from the cooling operation connection state to the heating operation connection state, and the heating operation is restarted.
  • FIG. 6 shows a timing chart of each element of the air conditioner 1.
  • 7 and 8 show a flowchart of the defrost operation.
  • the portion indicated by “A” in FIG. 7 and the portion indicated by “A” in FIG. 8 indicate that the processing is continuing, and are indicated by the portion indicated by “B” in FIG. 8 and the portion indicated by “B” in FIG. The location indicates that the process is continuing.
  • the column of “compressor” shows the rotation speed of the compressor 21
  • the column of “indoor fan” shows the airflow by the indoor fan 32
  • the column of “outdoor fan” shows the airflow by the outdoor fan 25.
  • the column of “outdoor expansion valve” indicates the valve opening degree of the outdoor expansion valve 24, and all of them indicate that the upper value is higher and the lower value is lower.
  • the column of "four-way switching valve” shows the connection state of the four-way switching valve 22, the upper stage is the heating operation connection state, and the lower stage is the cooling operation connection state. It shows each of them.
  • the column of "bypass valve” shows the open / closed state of the bypass valve 49, that the bypass valve 49 is open in the upper stage and the bypass valve 49 is closed in the lower stage. Are shown respectively.
  • the four-way switching valve 22 is switched to the heating operation connection state, and the bypass valve 49 is closed. Then, during the heating operation, the rotation speed is controlled so that the compressor 21 produces the required capacity, the indoor fan 32 is controlled to have a set air volume, and the outdoor fan 25 has a predetermined air volume.
  • the outdoor expansion valve 24 is controlled so as to have a predetermined valve opening degree. During the heating operation, the outdoor expansion valve 24 is controlled so as to satisfy a predetermined condition such that the degree of supercooling of the refrigerant flowing through the liquid side outlet of the indoor heat exchanger 31 becomes a target value.
  • step S10 the controller 7 determines whether or not the predetermined defrost start condition is satisfied.
  • the predetermined defrost start condition is not particularly limited, but may be, for example, a condition to be satisfied when the temperature and / or the outside air temperature of the refrigerant flowing through the outdoor heat exchanger 23 continues to be equal to or lower than a predetermined value for a predetermined time. ..
  • the detection temperature of the outdoor heat exchange temperature sensor 85 can be used
  • the detection temperature of the outside air temperature sensor 86 can be used. ..
  • the process proceeds to step S11, and if it is determined that the condition is not satisfied, the heating operation is continued.
  • step S11 as pre-defrost control, the controller 7 opens the bypass valve 49 and starts the hot gas bypass defrost operation while maintaining the connection state of the four-way switching valve 22 in the heating operation connection state.
  • the refrigerant discharged from the compressor 21 flows in from the gas side end of the outdoor heat exchanger 23 via the bypass circuit 48 having the capillary tube 48a.
  • the high-temperature and high-pressure refrigerant discharged from the compressor 21 and having little heat dissipation loss can be supplied to the gas side region of the outdoor heat exchanger 23, and the frost adhering to the region can be removed. It can be melted.
  • step S12 the controller 7 controls to reduce the rotation speed of the compressor 21. This makes it possible to suppress the switching sound at the time of switching the four-way switching valve 22, which will be described later, to a small value.
  • the controller 7 controls to reduce the valve opening degree of the outdoor expansion valve 24 in accordance with the decrease in the rotation speed of the compressor 21.
  • the outdoor expansion valve 24 is controlled so that the valve opening degree is smaller than the valve opening degree during the heating operation. More specifically, the outdoor expansion valve 24 is opened smaller than the valve opening degree controlled so that the degree of supercooling of the refrigerant flowing through the liquid side outlet of the indoor heat exchanger 31 becomes the target value during the heating operation. It is controlled to be a degree. More specifically, the temperature of the refrigerant after merging the refrigerant flowing through the bypass pipe 48 and the refrigerant flowing through the indoor heat exchanger 31, the liquid side refrigerant connecting pipe 6 and the outdoor expansion valve 24 is predetermined. The valve opening degree of the outdoor expansion valve 24 is controlled so as to reach the target temperature of. In the present embodiment, the valve opening degree of the outdoor expansion valve 24 is controlled so that the detection temperature of the outdoor heat exchange temperature sensor 85 becomes a predetermined target temperature.
  • controller 7 controls to reduce the air volume without stopping the indoor fan 32. As a result, it is possible to continue heating the room, although the capacity corresponds to the decrease in the number of revolutions of the compressor 21.
  • step S13 the controller 7 determines whether or not the rotation speed of the compressor 21 that started to be lowered in step S12 is equal to or less than a predetermined value.
  • the process proceeds to step S14. If the number of revolutions of the compressor 21 is not equal to or less than a predetermined value, processing such as lowering the number of revolutions of the compressor 21 is continued.
  • step S14 the controller 7 closes the bypass valve 49 and ends the hot gas bypass defrost operation.
  • step S15 the controller 7 waits for a predetermined time to elapse after the bypass valve 49 is closed, and then proceeds to step S16.
  • step S16 the controller 7 ends the pre-defrost control and starts the control during the defrost.
  • the controller 7 switches the connection state of the four-way switching valve 22 from the heating operation connection state to the cooling operation connection state, sets the valve opening of the outdoor expansion valve 24 to the fully open state, and stops the indoor fan 32 and the outdoor fan 25. Control to make it.
  • step S17 the controller 7 increases the number of revolutions of the compressor 21 and starts the reverse cycle defrost operation.
  • step S18 the controller 7 waits for a predetermined time to elapse after the hot gas bypass defrost operation is completed, and then proceeds to step S19.
  • step S19 the controller 7 determines whether or not the predetermined defrost end condition is satisfied.
  • the predetermined defrost end condition is not particularly limited, but may be, for example, a condition to be satisfied when the temperature of the refrigerant flowing through the outdoor heat exchanger 23 becomes equal to or higher than the predetermined temperature.
  • the detection temperature of the outdoor heat exchange temperature sensor 85 can be used as the temperature of the refrigerant flowing through the outdoor heat exchanger 23, for example.
  • the detection temperature of the outdoor heat exchange temperature sensor 85 which had risen due to the hot gas bypass defrost operation, decreases as the reverse cycle defrost operation is performed. Then, since the detection temperature of the outdoor heat exchange temperature sensor 85 has decreased due to waiting for the elapse of a predetermined time in step S18, the detection temperature of the outdoor heat exchange temperature sensor 85 raised by the hot gas bypass defrost operation determines the temperature. It is possible to avoid satisfying the defrost termination condition of.
  • step S20 if it is determined that the predetermined defrost end condition is satisfied, the process proceeds to step S20, and if it is determined that the condition is not satisfied, the reverse cycle defrost operation is continued.
  • step S20 the controller 7 ends the reverse cycle defrost operation by lowering the rotation speed of the compressor 21 and reducing the valve opening degree of the outdoor expansion valve 24.
  • step S21 the controller 7 waits for a predetermined time to elapse after the reverse cycle defrost operation is completed, and then proceeds to step S22.
  • step S22 the controller 7 ends the control during defrost and starts the control after defrost.
  • the controller 7 switches the connection state of the four-way switching valve 22 from the cooling operation connection state to the heating operation connection state.
  • step S21 since the rotation speed of the compressor 21 was lowered and a predetermined time was waited after the reverse cycle defrost operation was completed, the height differential pressure in the refrigerant circuit 10 could be reduced, and the four-way switching valve could be reduced. It is possible to suppress the switching sound of 22 to be small.
  • step S23 the controller 7 controls to increase the rotation speed of the compressor 21, increase the valve opening degree of the outdoor expansion valve 24, and increase the air volume of the outdoor fan 25.
  • step S24 the controller 7 restarts the heating operation by increasing the air volume of the indoor fan 32 so that a predetermined capacity can be secured.
  • step S10 After resuming the heating operation, the process returns to step S10 and the above process is repeated.
  • the hot gas bypass defrost operation of sending the refrigerant from the compressor 21 to the frosted outdoor heat exchanger 23 via the bypass pipe 48 is performed to perform the hot gas bypass defrost operation of the outdoor heat exchanger 23.
  • the frost adhering to the portion close to the outdoor expansion valve 24 can be melted. More specifically, the frost adhering to the portion of the outdoor heat exchanger 23 near the liquid side end can be melted.
  • the four-way switching valve 22 is connected to the cooling operation and the reverse cycle defrost operation is performed, so that the outdoor heat exchanger 23 is far from the portion close to the outdoor expansion valve 24.
  • the frost attached to the part can be melted. More specifically, the frost adhering to the portion of the outdoor heat exchanger 23 near the gas side end can be melted.
  • the indoor heat exchanger 31 can function as a radiator or a condenser of the refrigerant. This makes it possible to suppress a decrease in the indoor temperature until the reverse cycle defrost operation is started.
  • the valve opening degree of the outdoor expansion valve 24 is controlled to be smaller than the valve opening degree controlled during the immediately preceding heating operation. Is going.
  • a large amount of the refrigerant discharged from the compressor 21 and radiated or condensed in the indoor heat exchanger 31 is sent to the liquid side of the outdoor heat exchanger 23 via the liquid side refrigerant connecting pipe 6 and the outdoor expansion valve 24. It is possible to suppress this.
  • the high-temperature and high-pressure refrigerant discharged from the compressor 21 and flowing through the bypass pipe 48 passes through the indoor heat exchanger 31, the liquid-side refrigerant connecting pipe 6, and the outdoor expansion valve 24. It is possible to keep the degree of cooling by the refrigerant sent to the liquid side of the outdoor heat exchanger 23 small and to increase the melting efficiency of frost on the liquid side of the outdoor heat exchanger 23.
  • the rotation speed of the compressor 21 is lowered before the four-way switching valve 22 is switched from the heating operation connection state to the cooling operation connection state.
  • the connection state of the four-way switching valve 22 is switched by using the pressure difference of the refrigerant in the refrigerant circuit 10, it is possible to suppress the switching sound generated at the time of switching to be small.
  • the hot gas bypass defrost operation is performed by utilizing the time required for controlling the decrease in the rotation speed of the compressor 21 for suppressing the switching sound of the four-way switching valve 22 to be small.
  • This makes it possible to melt the frost near the gas side end of the outdoor heat exchanger 23. Therefore, the reverse cycle defrost operation can be started early after the defrost start condition is satisfied.
  • the frost near the gas side end of the outdoor heat exchanger 23 has already melted at the start of the reverse cycle defrost operation, the reverse cycle defrost operation can be ended early. As described above, it is possible to shorten the time required from satisfying the defrost start condition to satisfying the defrost end condition, improve the continuity of the heating operation, and suppress the decrease in the indoor temperature. ..
  • the bypass valve 49 of the bypass pipe 48 is closed during the reverse cycle defrost operation. Therefore, the high-temperature and high-pressure refrigerant discharged from the compressor 21 can be efficiently supplied to the gas side end of the outdoor heat exchanger 23.
  • the determination of the predetermined defrost operation end condition is performed not immediately after the end of the hot gas bypass defrost operation but after a predetermined time has elapsed from the start of the reverse cycle defrost operation. ..
  • the detection temperature of the outdoor heat exchange temperature sensor 85 may rise due to the hot gas bypass defrost operation, the detection temperature of the outdoor heat exchange temperature sensor 85 will decrease again due to the subsequent reverse cycle defrost operation.
  • the outdoor heat exchanger 23 has a flat multi-hole tube 58 having a flat shape containing aluminum or an aluminum alloy. Therefore, as compared with the conventional cross-fin tube heat exchanger in which a cylindrical copper heat transfer tube is used, the melted frost tends to remain on the upper surface of the flat multi-hole tube 58, and it is difficult for the frost to flow downward. As described above, even when the outdoor heat exchanger 23 in which the melted frost does not easily flow downward is used, the defrost operation is performed in the air conditioner 1 of the present embodiment, so that the melted frost is lowered. It is possible to keep the degree of difficulty in flowing small. As a result, for example, refreezing due to frost remaining on the upper surface of the flat multi-hole tube 58 can be suppressed.
  • the flat multi-hole pipe 58 included in the outdoor heat exchanger 23 has a flat shape, and a plurality of refrigerant flow paths 58b are provided inside. Therefore, the heat exchange efficiency in the outdoor heat exchanger 23 can be improved.
  • the high temperature and high pressure refrigerant discharged from the compressor 21 is supplied to the outdoor heat exchanger 23 in order to melt the frost adhering during the heating operation. Even in such a case, the refrigerant rapidly loses heat while passing through the inside of the outdoor heat exchanger 23. Therefore, on the side of the outdoor heat exchanger 23 opposite to the inlet side of the high-temperature and high-pressure refrigerant, undissolved frost is particularly likely to occur.
  • the refrigerant discharged from the compressor 21 during the reverse cycle defrost operation is the gas side header 54, the first upper heat exchange section 51a, and the first.
  • the upper folded header 53a, the second upper heat exchange section 52a, the second folded header 55, the second lower heat exchange section 52b, the first lower folded header 53b, the first lower heat exchange section 51b, and the liquid side header 56 flow in this order.
  • the refrigerant that has reached the first lower heat exchange section 51b has already released a large amount of heat, and its temperature tends to be low. For this reason, it tends to be difficult to efficiently melt the frost adhering to the first lower heat exchange portion 51b.
  • the hot gas bypass defrost operation is performed by flowing a high temperature and high pressure refrigerant through the bypass pipe 48 before performing the reverse cycle defrost operation. This makes it possible to efficiently melt the frost adhering to the first lower heat exchange section 51b, which is a portion near the liquid side end portion of the outdoor heat exchanger 23.
  • bypass pipe 48 instead of providing the capillary tube 48a and the bypass valve 49 which is an electromagnetic on-off valve, the bypass valve which is an electric expansion valve capable of controlling the valve opening degree. 49a may be provided.
  • the bypass valve 49 may be controlled to be opened when a predetermined protection condition is satisfied.
  • a part of the refrigerant discharged from the compressor 21 via the bypass pipe 48 can be supplied to the liquid side of the outdoor heat exchanger 23.
  • the indoor fan 32 since the indoor fan 32 is stopped, it may not be possible to sufficiently evaporate the refrigerant in the indoor heat exchanger 31, but even in that case, the indoor heat exchange Since the discharged refrigerant flowing through the bypass pipe 48 can be mixed with the refrigerant sent to the vessel 31, the refrigerant passing through the indoor heat exchanger 31 can be made slightly dry. This makes it possible to suppress the occurrence of liquid compression in the compressor 21.
  • the predetermined protection condition is not particularly limited, and examples thereof include the temperature of the refrigerant discharged from the compressor 21 and the temperature of the refrigerant sucked into the compressor 21 being equal to or less than a predetermined value.
  • the hot gas is controlled to maintain the compressor 21 without lowering the rotation speed before lowering the rotation speed of the compressor 21.
  • the bypass defrost operation may be started.
  • the process of maintaining the rotation speed of the compressor 21 may be performed for a predetermined time, for example, and then the rotation speed of the compressor 21 may be lowered.
  • the high-temperature and high-pressure refrigerant discharged from the compressor 21 maintained at a high rotation speed can be supplied to the liquid side end of the outdoor heat exchanger 23 via the bypass pipe 48. This makes it possible to increase the melting efficiency of frost near the liquid side end of the outdoor heat exchanger 23 at the initial stage of the hot gas bypass defrost operation.
  • the hot gas bypass defrost operation may be executed for a predetermined time and then terminated.
  • a refrigerant temperature sensor is provided near the center of the refrigerant path in the outdoor heat exchanger 23, and when the detection value of the temperature sensor exceeds a predetermined value, the hot gas bypass defrost operation is terminated.
  • a sensor for example, it may be a sensor that detects the temperature of the refrigerant passing through the second folded header 55 of the outdoor heat exchanger 23 of the above embodiment.
  • a sensor for detecting the temperature of the refrigerant flowing between the merging portion with the bypass pipe 48 and the outdoor expansion valve 24 is provided, and the detection value of the sensor is provided. May be used to determine a predetermined defrost termination condition.
  • the sensor since the sensor does not detect the temperature of the high-temperature refrigerant discharged from the compressor 21 during the hot gas bypass defrost operation, it is not necessary to wait for a predetermined time described in step S18 of the above embodiment. It becomes possible to do.
  • Air conditioner (refrigeration cycle device) 4 Liquid side refrigerant communication pipe 5 Gas side refrigerant communication pipe 7 Controller (control unit) 10 Refrigerant circuit 20 Outdoor unit 21 Compressor 22 Four-way switching valve (switching valve) 23 Outdoor heat exchanger 24 Outdoor expansion valve (expansion mechanism, expansion valve) 30 Indoor unit 31 Indoor heat exchanger 41-45 1st to 5th pipes 46 Suction pipe 47 Discharge pipe 48 Bypass pipe 48a Capillary tube 49 Bypass valve (control valve, on / off valve) 49a Bypass valve (control valve, expansion valve) 58 Flat multi-hole tube (flat heat transfer tube) 83 Discharge temperature sensor 84 Suction temperature sensor 85 Outdoor heat exchange temperature sensor (refrigerant temperature sensor) 86 Outside air temperature sensor

Landscapes

  • 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

Le but de la présente invention est de fournir un dispositif à cycle de réfrigération de telle sorte qu'il est possible de faire fondre suffisamment de givre qui est fixé à un échangeur de chaleur extérieur. Un dispositif de climatisation (1) comprend : un circuit de fluide frigorigène (10) qui est configuré par un compresseur (21), un échangeur de chaleur extérieur (23), une soupape d'expansion extérieure (24), et un échangeur de chaleur intérieur (31) qui sont connectés de manière séquentielle, et a une soupape de commutation à quatre voies (22) qui peut commuter entre un état de connexion d'opération de refroidissement et un état de connexion d'opération de chauffage et un tuyau de dérivation (48) qui s'étend depuis le côté de décharge du compresseur (21) entre l'échangeur de chaleur extérieur (23) et la soupape d'expansion extérieure (24) ; et un dispositif de commande (7). Pendant le dégivrage de l'échangeur de chaleur extérieur (23), le dispositif de commande (7) effectue une opération de dégivrage par dérivation de gaz chaud dans laquelle le fluide frigorigène est envoyé du compresseur (21) vers l'échangeur de chaleur extérieur (23) à travers le tuyau de dérivation (48) tandis que le fluide frigorigène évacué du compresseur (21) est envoyé à l'échangeur de chaleur intérieur (31) dans l'état de connexion d'opération de chauffage, puis commute la vanne de commutation à quatre voies (22) à l'état de connexion d'opération de refroidissement pour effectuer une opération de dégivrage à cycle inversé dans laquelle le fluide frigorigène est envoyé du compresseur (21) vers l'échangeur de chaleur extérieur (23).
PCT/JP2020/011286 2019-03-20 2020-03-13 Dispositif à cycle de réfrigération WO2020189586A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019053532A JP2020153604A (ja) 2019-03-20 2019-03-20 冷凍サイクル装置
JP2019-053532 2019-03-20

Publications (1)

Publication Number Publication Date
WO2020189586A1 true WO2020189586A1 (fr) 2020-09-24

Family

ID=72521074

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/011286 WO2020189586A1 (fr) 2019-03-20 2020-03-13 Dispositif à cycle de réfrigération

Country Status (2)

Country Link
JP (1) JP2020153604A (fr)
WO (1) WO2020189586A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7295318B1 (ja) 2022-09-20 2023-06-20 日立ジョンソンコントロールズ空調株式会社 空気調和機

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114198857B (zh) * 2021-11-17 2023-02-28 青岛海尔空调电子有限公司 一种空调控制方法及空调系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0712437A (ja) * 1993-06-22 1995-01-17 Mitsubishi Heavy Ind Ltd ヒートポンプ式空気調和機の除霜方法
JPH10253205A (ja) * 1997-03-12 1998-09-25 Matsushita Electric Ind Co Ltd 冷凍サイクル制御装置
JP2008101819A (ja) * 2006-10-18 2008-05-01 Hitachi Appliances Inc 空気調和機
JP2008256264A (ja) * 2007-04-05 2008-10-23 Matsushita Electric Ind Co Ltd 空気調和機

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0712437A (ja) * 1993-06-22 1995-01-17 Mitsubishi Heavy Ind Ltd ヒートポンプ式空気調和機の除霜方法
JPH10253205A (ja) * 1997-03-12 1998-09-25 Matsushita Electric Ind Co Ltd 冷凍サイクル制御装置
JP2008101819A (ja) * 2006-10-18 2008-05-01 Hitachi Appliances Inc 空気調和機
JP2008256264A (ja) * 2007-04-05 2008-10-23 Matsushita Electric Ind Co Ltd 空気調和機

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7295318B1 (ja) 2022-09-20 2023-06-20 日立ジョンソンコントロールズ空調株式会社 空気調和機
JP2024043670A (ja) * 2022-09-20 2024-04-02 日立ジョンソンコントロールズ空調株式会社 空気調和機

Also Published As

Publication number Publication date
JP2020153604A (ja) 2020-09-24

Similar Documents

Publication Publication Date Title
JP4497234B2 (ja) 空気調和装置
WO2018047416A1 (fr) Climatiseur
JP5402027B2 (ja) 空気調和機
EP3312528B1 (fr) Climatiseur
WO2014061134A1 (fr) Climatiseur
JP2008082589A (ja) 空気調和装置
US10480837B2 (en) Refrigeration apparatus
JP6379769B2 (ja) 空気調和装置
WO2020189586A1 (fr) Dispositif à cycle de réfrigération
JP2006300374A (ja) 空気調和機
JP2002372320A (ja) 冷凍装置
JP3941817B2 (ja) 空気調和機
JP5594030B2 (ja) コントローラ、調湿用制御部および空調処理システム
JP4622901B2 (ja) 空気調和装置
JP2002243307A (ja) 空気調和装置
WO2021065914A1 (fr) Appareil de congélation
JP3835478B1 (ja) 空気調和機
JP2016151372A (ja) 空気調和装置
WO2024166938A1 (fr) Dispositif à cycle frigorifique
JP5999163B2 (ja) 空気調和装置
JP7448848B2 (ja) 空気調和装置
JP7408942B2 (ja) 空気調和装置
JP2000220891A (ja) 空気調和装置
JP2008057866A (ja) 空気調和装置
JP5858022B2 (ja) 空気調和装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20773869

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20773869

Country of ref document: EP

Kind code of ref document: A1