WO2021192195A1 - Climatiseur - Google Patents

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Publication number
WO2021192195A1
WO2021192195A1 PCT/JP2020/013900 JP2020013900W WO2021192195A1 WO 2021192195 A1 WO2021192195 A1 WO 2021192195A1 JP 2020013900 W JP2020013900 W JP 2020013900W WO 2021192195 A1 WO2021192195 A1 WO 2021192195A1
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WO
WIPO (PCT)
Prior art keywords
valve
heat exchanger
refrigerant
temperature
cooling operation
Prior art date
Application number
PCT/JP2020/013900
Other languages
English (en)
Japanese (ja)
Inventor
田中　健司
牧野　浩招
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2020/013900 priority Critical patent/WO2021192195A1/fr
Priority to JP2022510303A priority patent/JP7241967B2/ja
Publication of WO2021192195A1 publication Critical patent/WO2021192195A1/fr

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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0313—Pressure sensors near the outdoor heat exchanger
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0314—Temperature sensors near the indoor heat exchanger
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/031—Sensor arrangements
    • F25B2313/0315—Temperature sensors near the outdoor heat exchanger
    • 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
    • F25B2347/00—Details for preventing or removing deposits or corrosion
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/19—Calculation of parameters
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/26—Problems to be solved characterised by the startup of the refrigeration cycle
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/31—Low ambient temperatures
    • 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
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0253—Compressor control by controlling speed with variable speed
    • 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
    • F25B2600/23—Time delays
    • 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
    • F25B2600/25—Control of valves
    • F25B2600/2507—Flow-diverting valves
    • 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
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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
    • F25B2600/25—Control of valves
    • F25B2600/2519—On-off valves
    • 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
    • F25B2700/2104—Temperatures of an indoor room or compartment
    • 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
    • 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
    • F25B2700/2116—Temperatures of a condenser
    • 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
    • F25B2700/2117—Temperatures of an evaporator
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • This disclosure relates to an air conditioner, particularly to a cooling operation at a low outside air temperature.
  • an air conditioner has a refrigerant circuit in which a compressor, a condenser, an expansion valve, and an evaporator are connected by a refrigerant pipe.
  • the air conditioner is installed in a machine room in which a heat-generating device such as a computer or a telephone exchange is installed, and performs a cooling operation to suppress an increase in the room temperature of the machine room due to the heat generated by the device.
  • Air conditioners installed in machine rooms, etc. need to be cooled regardless of the season. However, in a low outside air environment where the outside air temperature is below freezing, the refrigerant existing in the outdoor unit is cooled by the outside air while the operation of the air conditioner is stopped, and accumulates in equipment such as the compressor and condenser mounted on the outdoor unit.
  • Some conventional air conditioners have a configuration that prevents the refrigerant from accumulating in the compressor, that is, the refrigerant from falling asleep when the operation is stopped (see, for example, Patent Document 1).
  • Patent Document 1 a parallel circuit including a refrigerant cylinder is provided in parallel with the refrigerant pipe on the outdoor unit side of the refrigerant pipes connecting the condenser and the evaporator, and two solenoid valves are provided before and after the refrigerant cylinder in the parallel circuit. Is disclosed to be provided.
  • an air conditioner is configured to perform antifreezing control to stop the compressor when the temperature of the evaporator becomes lower than the set temperature in order to prevent the condensed water generated in the evaporator of the indoor unit from freezing during the cooling operation. Has been done.
  • the present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide an air conditioner capable of performing a steady cooling operation in a cooling operation in a low outside air environment.
  • the air conditioner according to the present disclosure is an air conditioner in which an indoor unit installed in an air-conditioned space and an outdoor unit are connected, and is a compressor, a flow path switching valve, an outdoor heat exchanger, and an expansion valve.
  • the indoor heat exchanger are provided in the refrigerant circuit connected by the refrigerant pipe, and in the refrigerant circuit between one of the inlet / outlet of the indoor heat exchanger and the flow path switching valve, and arranged in the indoor unit. It is provided with a first on-off valve provided, and a second on-off valve provided between the other of the inlet and outlet of the indoor heat exchanger and the expansion valve in the refrigerant circuit and arranged in the indoor unit.
  • the refrigerant can be stored in the indoor unit by using these on-off valves, and the operation can be performed even in a low outside air environment. It suppresses the decrease in the refrigerant temperature due to the outside air temperature during stoppage, and enables steady operation when the cooling operation is restarted.
  • FIG. It is the schematic which shows an example of the refrigerant circuit of the air conditioner which concerns on Embodiment 1.
  • FIG. It is a functional block diagram which shows the function of the control device described in FIG. It is a flowchart of the control performed by the control device when the cooling operation is stopped in low outside air. It is a figure which shows the operation of each device in the 1st control. It is explanatory drawing which shows the refrigerant flow of the refrigerant circuit at the time of performing the storage process of the 1st control. It is a refrigerant circuit diagram which shows the state which the refrigerant is sealed in the indoor unit after the completion of the storage process of FIG.
  • FIG. 1 is a schematic view showing an example of a refrigerant circuit of the air conditioner according to the first embodiment.
  • the air conditioner 100 includes an indoor unit 20 installed in a room (indoor) which is an air-conditioned space, and an outdoor unit 10 connected to the indoor unit 20 and installed outdoors (outdoors), for example. Further, the air conditioner 100 includes a control device 50 that controls the operation of the air conditioner 100 by controlling each device constituting the outdoor unit 10 and the indoor unit 20.
  • the indoor unit 20 includes an indoor heat exchanger 5.
  • the outdoor unit 10 includes a compressor 1, a flow path switching valve 2, an outdoor heat exchanger 3, an expansion valve 4, and the like. These compressor 1, flow path switching valve 2, outdoor heat exchanger 3, expansion valve 4, and indoor heat exchanger 5 are connected in an annular shape via a refrigerant pipe to form a refrigerant circuit 100a.
  • the refrigerant circuit 100a is filled with a refrigerant.
  • the type of refrigerant is not particularly limited.
  • the outdoor unit 10 and the indoor unit 20 are connected by two connecting pipes 7 and 8.
  • the connection pipe 7 connects the outdoor unit 10 and the indoor unit 20 between the expansion valve 4 and the indoor heat exchanger 5, and a gas refrigerant flows through the connection pipe 7.
  • the connection pipe 8 connects the outdoor unit 10 and the indoor unit 20 between the indoor heat exchanger 5 and the flow path switching valve 2, and a liquid refrigerant flows through the connection pipe 8.
  • the indoor unit 20 includes an indoor pipe 28 that connects one of the refrigerant inlets and outlets of the indoor heat exchanger 5 and the connection pipe 8, and an indoor pipe 27 that connects the other of the refrigerant inlets and outlets of the indoor heat exchanger 5 and the connection pipe 7. Has.
  • the compressor 1 compresses the refrigerant, discharges it, and circulates it.
  • the compressor 1 is configured to include a compression mechanism for compressing the refrigerant and a compressor motor for operating the compression mechanism inside a shell which is an outer shell.
  • the compressor motor is a three-phase motor having three-phase motor windings of U-phase, V-phase and W-phase. A voltage is applied to the compressor motor by an inverter (not shown).
  • the flow path switching valve 2 is composed of, for example, a four-way valve, and switches the flow path of the refrigerant circuit 100a between the cooling operation and the heating operation of the air conditioner 100 to switch the flow direction of the refrigerant.
  • the discharge side of the compressor 1 is connected to the outdoor heat exchanger 3, and in the heating operation, the suction side of the compressor 1 is connected to the outdoor heat exchanger 3.
  • FIG. 1 shows a connection state of the flow path switching valve 2 when the air conditioner 100 is in the cooling operation.
  • the flow path switching valve 2 may have a configuration in which a three-way switching valve, a two-way switching valve, or the like is combined.
  • the outdoor heat exchanger 3 exchanges heat between the refrigerant and the outside air, and is composed of, for example, a fin-and-tube heat exchanger having a plurality of fins and a plurality of heat transfer tubes.
  • the outdoor heat exchanger 3 acts as a condenser, and when the air conditioner 100 is in the heating operation, the outdoor heat exchanger 3 acts as an evaporator.
  • the expansion valve 4 decompresses and expands the refrigerant.
  • the indoor heat exchanger 5 exchanges heat between the refrigerant and the indoor air, and is composed of, for example, a fin-and-tube heat exchanger having a plurality of fins and a plurality of heat transfer tubes.
  • the indoor heat exchanger 5 acts as an evaporator, and when the air conditioner 100 is in the heating operation, the indoor heat exchanger 5 acts as a condenser.
  • the indoor unit 20 further includes an indoor fan 21 that blows air to the indoor heat exchanger 5.
  • the outdoor unit 10 further includes an outdoor fan 11 that blows air to the outdoor heat exchanger 3.
  • the indoor unit 20 has two on-off valves (first on-off valve 31 and second on-off valve 32) capable of storing the refrigerant in the indoor unit 20.
  • the first on-off valve 31 and the second on-off valve 32 are each composed of, for example, an electromagnetic on-off valve.
  • the first on-off valve 31 is provided in the indoor pipe 28 through which the gas refrigerant flows, and the second on-off valve 32 is provided in the indoor pipe 27 in which the liquid refrigerant flows.
  • the air conditioner 100 is provided with a plurality of sensors. Specifically, a second sensor 42 for detecting the room temperature of the room which is the space to be air-conditioned and a fourth sensor 44 for detecting the temperature of the indoor heat exchanger 5 are provided.
  • the second sensor 42 is composed of, for example, a temperature sensor, and is arranged in the vicinity of a suction port provided in a housing (not shown) of the indoor unit 20.
  • the fourth sensor 44 is composed of, for example, a temperature sensor, and is arranged in the heat transfer tube of the indoor heat exchanger 5 to detect the surface temperature of the heat transfer tube.
  • the fourth sensor 44 may be installed at a position in the middle of the heat transfer tube connecting the refrigerant inlet / outlet in the indoor heat exchanger 5.
  • the outdoor unit 10 is provided with a first sensor 41 for detecting the outside air temperature and a third sensor 43 for detecting the temperature of the outdoor heat exchanger 3.
  • the first sensor 41 is composed of, for example, a temperature sensor.
  • the third sensor 43 is composed of, for example, a temperature sensor, and is arranged in the heat transfer tube of the outdoor heat exchanger 3 to detect the surface temperature of the heat transfer tube. In particular, the third sensor 43 may be installed at a position intermediate between the heat transfer tubes connecting the two entrances and exits of the outdoor heat exchanger 3.
  • the third sensor 43 is composed of a pressure sensor and a control device 50.
  • the pressure sensor detects the refrigerant pressure in the heat transfer tube of the outdoor heat exchanger 3, and the detected refrigerant pressure of the outdoor heat exchanger 3 is used.
  • the control device 50 may calculate the temperature. Alternatively, when the compressor 1 or the like is controlled by using the condensation temperature during operation, a sensor that detects the condensation temperature can be used as the third sensor 43.
  • the control device 50 is composed of dedicated hardware or a CPU (Central Processing Unit) that executes a program stored in a memory.
  • the CPU is also referred to as a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a processor.
  • control device 50 When the control device 50 is dedicated hardware, the control device 50 may be, for example, a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Applicable. Each of the functional units realized by the control device 50 may be realized by individual hardware, or each functional unit may be realized by one hardware.
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • each function executed by the control device 50 is realized by software, firmware, or a combination of software and firmware.
  • Software and firmware are written as programs and stored in memory.
  • the CPU realizes each function of the control device 50 by reading and executing the program stored in the memory.
  • the memory is a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, or EEPROM.
  • a part of the function of the control device 50 may be realized by dedicated hardware, and a part may be realized by software or firmware.
  • the control device 50 is electrically connected to each of a plurality of sensors including the first sensor 41, the second sensor 42, the third sensor 43, and the fourth sensor 44, and the control device 50 detects the plurality of sensors. Information is entered. Further, from a remote controller (not shown), the start and stop of the cooling operation, the start and stop of the heating operation, the set temperature during the cooling operation, the set temperature during the heating operation, and the like are input to the control device 50. The control device 50 controls the operation of each device constituting the outdoor unit 10 and the indoor unit 20 based on the input information.
  • FIG. 2 is a functional block diagram showing the functions of the control device shown in FIG.
  • the control device 50 includes an input unit 51, a main control unit 52, and a storage unit 53 as functional units.
  • the detection information of a plurality of sensors, the information via the remote controller, and the like are input to the input unit 51.
  • the storage unit 53 stores the information input to the input unit 51, the set value used by the main control unit 52 to control each device, the control target value, and the like.
  • the main control unit 52 Based on the information input to the input unit 51, the main control unit 52 switches the frequency of the compressor 1, the flow path switching valve 2, the opening degree of the expansion valve 4, the rotation speed of the outdoor fan 11, and the indoor fan 21. Controls the number of rotations, etc.
  • the main control unit 52 controls the operations of the first on-off valve 31 and the second on-off valve 32 based on the information input to the input unit 51. Specifically, the main control unit 52 fully opens the first on-off valve 31 and the second on-off valve 32 during the cooling operation and the heating operation.
  • the air conditioner 100 prevents the dew condensation water generated on the surface of the heat transfer tube of the indoor heat exchanger 5 from freezing when the temperature of the indoor heat exchanger 5 is equal to or lower than the set temperature during the cooling operation. It has a function. Specifically, the main control unit 52 sets the compressor 1 when the temperature of the indoor heat exchanger 5 detected by the fourth sensor 44 becomes, for example, 3 ° C. or lower during the cooling operation of the air conditioner 100. Controls to stop the operation. With such anti-freezing control, it is possible to prevent the indoor heat exchanger 5 from freezing and prevent damage to the equipment due to freezing.
  • the main control unit 52 performs a refrigerant storage process and a compressor according to the detection information of the first sensor 41, the second sensor 42, and the third sensor 43.
  • the first control including the preheating of 1 is performed.
  • the first on-off valve 31, the second on-off valve 32, the flow path switching valve 2, and the compressor 1 are controlled to perform predetermined operations. The first control will be described later.
  • the main control unit 52 responds to the detection information of the first sensor 41, the second sensor 42, and the third sensor 43. , Performs a second control including the release process of the refrigerant. Specifically, in the second control, the first on-off valve 31, the second on-off valve 32, the expansion valve 4, the compressor 1, and the outdoor fan 11 are controlled to perform predetermined operations. The second control will be described later.
  • the flow path switching valve 2 is in the connected state shown by the solid line in FIG. In FIG. 1, the direction of the refrigerant flow during the cooling operation is indicated by a solid arrow.
  • the refrigerant is compressed by the compressor 1 to a high temperature and high pressure, and flows into the outdoor heat exchanger 3 via the flow path switching valve 2.
  • the refrigerant that has flowed into the outdoor heat exchanger 3 is condensed and liquefied by dissipating heat from the surrounding air, that is, the outside air in the outdoor heat exchanger 3.
  • the drive of the outdoor fan 11 promotes heat exchange between the refrigerant and the outside air.
  • the refrigerant flowing out of the outdoor heat exchanger 3 is decompressed by the expansion valve 4 to expand, and enters the indoor unit 20 through the connecting pipe 7.
  • the refrigerant that has entered the indoor unit 20 flows into the indoor heat exchanger 5 through the second on-off valve 32 that is fully opened.
  • the refrigerant flowing into the indoor heat exchanger 5 evaporates and gasifies by absorbing heat from the surrounding air, that is, the indoor air in the indoor heat exchanger 5.
  • the drive of the indoor fan 21 promotes heat exchange between the refrigerant and the indoor air.
  • the refrigerant flowing out of the indoor heat exchanger 5 flows out from the indoor unit 20 through the first on-off valve 31 which is fully opened, and flows into the outdoor unit 10 through the connection pipe 8.
  • the refrigerant that has flowed into the outdoor unit 10 is sucked into the compressor 1 again via the flow path switching valve 2 and compressed. During the cooling operation, the above cycle is repeated to cool the room.
  • the flow path switching valve 2 is in the connected state shown by the broken line in FIG.
  • the refrigerant is compressed by the compressor 1 to a high temperature and high pressure, and flows out from the outdoor unit 10 via the flow path switching valve 2.
  • the refrigerant flowing out of the outdoor unit 10 flows into the indoor unit 20 through the connecting pipe 8 and flows into the indoor heat exchanger 5 through the first on-off valve 31 which is fully opened.
  • the refrigerant flowing into the indoor heat exchanger 5 is condensed and liquefied by radiating heat to the surrounding air, that is, the indoor air in the indoor heat exchanger 5.
  • the drive of the indoor fan 21 promotes heat exchange between the refrigerant and the air.
  • the refrigerant flowing out of the indoor heat exchanger 5 flows out from the indoor unit 20 through the second on-off valve 32 which is fully opened.
  • the refrigerant flowing out of the indoor unit 20 flows into the outdoor unit 10 through the connecting pipe 7, is decompressed by the expansion valve 4, expands, and flows into the outdoor heat exchanger 3.
  • the refrigerant flowing into the outdoor heat exchanger 3 evaporates and gasifies by absorbing heat from the surrounding air, that is, the outside air in the outdoor heat exchanger 3.
  • the drive of the outdoor fan 11 promotes heat exchange between the refrigerant and the air.
  • the refrigerant flowing out of the outdoor heat exchanger 3 is sucked into the compressor 1 again through the flow path switching valve 2 and compressed. During the heating operation, the above cycle is repeated to heat the room.
  • FIG. 3 is a flowchart of control performed by the control device when the cooling operation is stopped in low outside air.
  • FIG. 4 is a diagram showing the operation of each device in the first control.
  • the compressor 1 When the air conditioner 100 is performing the cooling operation, as shown in FIGS. 1 and 4, the compressor 1 is operated, the flow path switching valve 2 is on the cooling side, and the first on-off valve 31 and the first on-off valve 31 and the second (2) The on-off valve 32 is fully opened, and the refrigerant circulates in the refrigerant circuit 100a in the cycle during the cooling operation.
  • the frequency of the compressor 1, the opening degree of the expansion valve 4, the outdoor fan 11 and the indoor fan 21 are controlled by the control device 50 according to the load and setting in the room.
  • step S1 When a command to stop the cooling operation is input during the cooling operation, the control shown in FIG. 3 is started, and the operation stop process is first performed (step S1). Specifically, the operation of the indoor fan 21 and the operation of the outdoor fan 11 are stopped.
  • the timing at which the control of FIG. 3 starts is not limited to the time when a command is input via the remote controller. For example, when the end time of the cooling operation is determined by the timer function or the like, the control of FIG. 3 is automatically started when the end time is reached.
  • step S1 the control device 50 determines whether or not the outside air temperature To detected by the first sensor 41 is equal to or lower than the room temperature Ti detected by the second sensor 42 (step S2). When the outside air temperature To is higher than the room temperature Ti, the control device 50 determines that the outside air temperature To is not below the room temperature Ti (step S2; NO), and immediately stops the compressor 1 (step S9). After the compressor 1 is stopped (step S9), the control of FIG. 3 ends.
  • step S2 when it is determined that the outside air temperature To is room temperature Ti or less (step S2; YES), the control device 50 performs the first control of steps S3 to S8. Specifically, the control device 50 first switches the flow path switching valve 2 to the heating side (step S3), fully closes the second on-off valve 32 (step S4), and stores the refrigerant in the indoor unit 20. To start.
  • FIG. 5 is an explanatory diagram showing the refrigerant flow of the refrigerant circuit when the first control storage process is being performed.
  • the amount of refrigerant in the outdoor heat exchanger 3 and the amount of refrigerant in the indoor heat exchanger 5 at the start of the storage process are schematically shown by diagonal lines.
  • the compressor 1 is operated when the storage process is being carried out.
  • the refrigerant discharged from the compressor 1 flows into the indoor heat exchanger 5 via the flow path switching valve 2, the connection pipe 8, and the first on-off valve 31, and is fully closed.
  • the second on-off valve 32 blocks the outflow from the indoor unit 20 and stores the heat mainly in the indoor heat exchanger 5.
  • the refrigerant in the outdoor heat exchanger 3 decreases.
  • the control device 50 When the storage process is started and the set time elapses, the control device 50 has the same temperature Tex of the outdoor heat exchanger 3 detected by the third sensor 43 as the outside air temperature To detected by the first sensor 41. Whether or not it is determined (step S5). Immediately after the storage process is started, the temperature Thex of the outdoor heat exchanger 3 is equal to or lower than the outside air temperature To. When the storage process is being carried out, the amount of refrigerant in the outdoor heat exchanger 3 is reduced by moving the refrigerant on the outdoor unit 10 side to the indoor unit 20 side by the cycle shown in FIG. Therefore, the heat transfer tube of the outdoor heat exchanger 3 is cooled by the outside air, and the temperature Thex of the outdoor heat exchanger 3 gradually decreases.
  • step S5 determines whether or not the storage process is completed.
  • step S5 when the temperature Thex of the outdoor heat exchanger 3 is not the outside air temperature To (step S5; NO), it is determined that the storage process has not been completed yet, and the control device 50 determines the predetermined time. When the elapse has passed, the determination in step S5 is performed again. The determination in step S5 is repeated until the temperature Thex of the outdoor heat exchanger 3 reaches the outside air temperature To. When the temperature Thex of the outdoor heat exchanger 3 reaches the outside air temperature To (step S5; YES), it is determined that the storage process is completed, and the control device 50 fully closes the first on-off valve 31, which is fully open. (Step S6), and the compressor 1 is stopped (step S7).
  • FIG. 6 is a refrigerant circuit diagram showing a state in which the refrigerant is sealed in the indoor unit after the storage process of FIG. 5 is completed.
  • the amount of refrigerant in the outdoor heat exchanger 3 and the amount of refrigerant in the indoor heat exchanger 5 at the start of the storage process are schematically shown by diagonal lines.
  • the outflow of the refrigerant stored on the indoor unit 20 side to the outdoor unit 10 side by the storage process is suppressed. , The refrigerant is trapped in the indoor unit 20.
  • the refrigerant is stored in the region between the first on-off valve 31 and the second on-off valve 32, including the indoor heat exchanger 5.
  • the above storage process is performed when the cooling operation is stopped, so that the indoor heat exchanger 5 is performing the cooling operation after the cooling operation is stopped. There will be more refrigerant than.
  • the control device 50 controls the inverter so that the compressor 1 is constrained and energized (step S8).
  • the restraint energization means energizing the motor windings without driving the compressor motor, and the compressor 1 can be preheated by the restraint energization.
  • a high frequency AC voltage of several kHz or more is output to the compressor motor.
  • the outdoor unit 10 including the compressor 1 is cooled by the outside air and becomes the same temperature as the outside air temperature.
  • the refrigerant is cooled while flowing in the outdoor unit 10 and flows into the indoor unit 20. Therefore, when the cooling operation is started, a particularly low temperature refrigerant flows into the indoor unit 20, so that the surface temperature of the heat transfer tube of the indoor heat exchanger 5 tends to be lower than the set temperature, and the antifreeze control functions to cause the compressor 1 to function. It may be stopped.
  • the temperature drop of the refrigerant is suppressed by performing the restraint energization of the compressor 1 as one step of the first control, and the cooling operation is constantly performed by the antifreeze control at the start of the cooling operation. Is prevented from being hindered.
  • the restraint energization of the compressor 1 it is possible to prevent the occurrence of the refrigerant stagnation phenomenon in which the refrigerant accumulates in the compressor 1 while the operation is stopped.
  • FIG. 7 is a flowchart of the second control performed by the control device at the start of the cooling operation in low outside air.
  • FIG. 8 is a diagram showing the operation of each device in the second control.
  • the compressor 1 When the air conditioner 100 is stopped in operation after the storage process is performed, the compressor 1 is stopped and the flow path switching valve 2 is set to the cooling side, as shown in FIGS. 6 and 8.
  • the first on-off valve 31 and the second on-off valve 32 are fully closed, and the refrigerant is sealed on the indoor unit 20 side.
  • the expansion valve 4 is closed and the outdoor fan 11 is stopped.
  • step S11 the control device 50 performs an operation start process (step S11), fully opens the first on-off valve 31 that is fully closed (step S12), and fully opens the closed expansion valve 4. (Step S13).
  • step S11 the compressor 1 is activated and the indoor fan 21 starts operation.
  • the timing at which the second control starts is not limited to the time when the command is input via the remote controller. For example, when the start time of the refrigerant operation is determined by the timer function or the like, the second control is automatically disclosed when the start time is reached.
  • FIG. 9 is an explanatory diagram showing the refrigerant flow of the refrigerant circuit when the release process of the second control is being performed.
  • the flow path switching valve 2 is on the cooling side.
  • the refrigerant stored in the indoor heat exchanger 5 flows into the outdoor unit 10 through the first on-off valve 31 and the connecting pipe 8 which are fully opened by the operation of the compressor 1.
  • the refrigerant released from the indoor unit 20 and flowing into the outdoor unit 10 passes through the flow path switching valve 2 and is sucked into the compressor 1, compressed and flows into the outdoor heat exchanger 3.
  • the refrigerant flowing into the outdoor heat exchanger 3 tries to flow into the indoor unit 20 side through the expansion valve 4 which is fully opened and through the connection pipe 7, but the second on-off valve 32 which is fully closed. This prevents the movement to the indoor heat exchanger 5. Therefore, at the start of the cooling operation, it is possible to prevent the low-temperature refrigerant existing in the outdoor heat exchanger 3 while the operation is stopped from directly flowing into the indoor heat exchanger 5.
  • the outdoor fan 11 is stopped while the compressor 1 is operated, and the expansion valve 4 is fully opened, so that the outdoor unit of the second on-off valve 32 including the connection pipe 7 is operated.
  • the refrigerant discharged from the compressor 1 can easily move to the refrigerant pipe on the 10 side. Therefore, when the release process is being performed, the temperature of the refrigerant existing in the refrigerant pipe on the outdoor unit 10 side of the second on-off valve 32 rises.
  • the control device 50 determines whether or not the temperature Tex of the outdoor heat exchanger 3 detected by the third sensor 43 is equal to or higher than the outside air temperature To detected by the first sensor 41. Is determined (step S14). When the temperature Thex of the outdoor heat exchanger 3 is less than the outside air temperature To (step S14; NO), the control device 50 re-determines step S14 when a predetermined time has elapsed. The determination in step S14 is repeated until the temperature Thex of the outdoor heat exchanger 3 becomes equal to or higher than the outside air temperature To.
  • step S14 when the temperature Thex of the outdoor heat exchanger 3 becomes equal to or higher than the outside air temperature To (YES in step S14; YES), the control device 50 ends the release process and starts the normal cooling operation. Specifically, the control device 50 starts the operation of the stopped outdoor fan 11 (step S15), and fully opens the second on-off valve 32 that is fully closed (step S16). After step S16, the control of FIG. 7 ends.
  • the refrigerant blocked by the second on-off valve 32 in the release process flows into the indoor heat exchanger 5 when the second on-off valve 32 is fully opened.
  • the indoor heat exchanger 5 since the temperature of the refrigerant flowing into the indoor heat exchanger 5 rises during the release process, the indoor heat exchanger 5 is extremely cooled at the start of the cooling operation after the release process is completed. Can be avoided. Therefore, even in a low outside air environment, it is possible to prevent the antifreezing control from functioning at the start of the cooling operation, and it is possible to perform a steady cooling operation.
  • a cooling operation is performed in which the refrigerant circulates in the refrigerant circuit 100a in the cycle shown in FIG. 1, and the frequency of the compressor 1, the opening degree of the expansion valve 4, and the rotation speed of the outdoor fan 11 are performed according to the load in the room. Is controlled.
  • the air conditioner 100 includes a refrigerant circuit 100a, a first on-off valve 31, and a second on-off valve 32.
  • the first on-off valve 31 is provided between one of the inlet and outlet of the indoor heat exchanger 5 and the flow path switching valve 2 in the refrigerant circuit 100a, and is arranged in the indoor unit 20.
  • the second on-off valve 32 is provided between the other of the inlet and outlet of the indoor heat exchanger 5 and the expansion valve 4 in the refrigerant circuit 100a, and is arranged in the indoor unit 20.
  • the first on-off valve 31 and the second on-off valve 32 can store the refrigerant in the refrigerant circuit 100a on the indoor unit 20 side including the indoor heat exchanger 5. Therefore, even in a low outside air environment, it is possible to suppress a decrease in the refrigerant temperature due to the outside air temperature when the operation is stopped, and it is possible to prevent the antifreezing control suppression from functioning when the cooling operation is restarted, so that the cooling operation can be continuously performed.
  • the air conditioner 100 includes a first sensor 41 that detects the outside air temperature To, a second sensor 42 that detects the room temperature of the air-conditioned space, and a control device 50.
  • the control device 50 switches the flow path switching valve 2 when the outside air temperature To detected by the first sensor 41 is equal to or lower than the room temperature Ti detected by the second sensor 42.
  • Control is performed so that the on-off valve 32 is fully closed. With such control, it is possible to easily realize that the refrigerant is moved to the indoor unit 20 side and stored when the cooling operation is stopped in a low outside air environment.
  • the air conditioner 100 further includes a third sensor 43 that detects the temperature Tex of the outdoor heat exchanger 3, and the control device 50 further starts the storage process, and then the temperature Tex of the outdoor heat exchanger 3 changes to the outside air temperature.
  • the first on-off valve 31 is controlled to be fully closed. As a result, it is possible to prevent the outflow of the stored refrigerant that has moved to the indoor unit 20 side by the storage process and to keep the refrigerant sealed in the indoor unit 20 while the operation is stopped.
  • control device 50 stops the compressor 1 after completing the storage process by fully closing the first on-off valve 31, and controls the compressor 1 so as to be restrained and energized.
  • the compressor 1 can be preheated, and the temperature drop of the refrigerant existing on the outdoor unit 10 side due to the outside air can be delayed. Therefore, the temperature drop of the refrigerant flowing into the indoor unit 20 when the cooling operation is restarted can be minimized while the operation is stopped, and the effect that the steady cooling operation can be performed can be further enhanced. Further, by restraining energization, it is possible to suppress the occurrence of the refrigerant sneaking phenomenon during the operation stop.
  • control device 50 starts the compressor 1 and fully opens the first on-off valve 31 to fully open the expansion valve when the cooling operation is restarted after the cooling operation is stopped when the outside air temperature To is room temperature Ti or less. Control is performed so that 4 is fully opened.
  • the first on-off valve 31 and the second on-off valve 32 arranged in the indoor unit 20 operate in this way by the control device 50, so that the refrigerant cooled by the outside air in the outdoor heat exchanger 3 when the operation is stopped is released. It is possible to prevent the indoor unit 20 from flowing into the indoor unit 20 at the same temperature. Further, since the temperature of the refrigerant flowing into the indoor unit 20 can be raised when the cooling operation is restarted, it is possible to prevent the evaporation temperature from decreasing in the cycle during the cooling operation.
  • the control device 50 restarts the cooling operation after the storage process is performed and the operation of the air conditioner 100 is stopped, the temperature Thex of the outdoor heat exchanger 3 is equal to or higher than the outside air temperature To after the release process is started.
  • the second on-off valve 32 is controlled to be fully opened.
  • control device 50 that controls the compressor 1 also has a function of controlling the first on-off valve 31 and the second on-off valve 32, but controls that control the first on-off valve 31 and the second on-off valve 32.
  • the substrate may be provided separately from the control device 50. In this case, the control board and the control device 50 are electrically connected.
  • the first control includes the step of restraint energization for the compressor 1, but the restraint energization can be omitted.
  • the air conditioner 100 may be configured to perform restraint energization at a predetermined timing while the operation is stopped.
  • 1 Compressor 2 Flow path switching valve, 3 Outdoor heat exchanger, 4 Expansion valve, 5 Indoor heat exchanger, 7, 8 Connection piping, 10 Outdoor unit, 11 Outdoor fan, 20 Indoor unit, 21 Indoor fan, 27, 28 Indoor piping, 31 1st on-off valve, 32 2nd on-off valve, 41 1st sensor, 42 2nd sensor, 43 3rd sensor, 44 4th sensor, 50 control device, 51 input unit, 52 main control unit, 53 Storage unit, 100 air conditioner, 100a refrigerant circuit, The temperature of the outdoor heat exchanger, Ti room temperature, To outside temperature.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un climatiseur, dans lequel une unité intérieure installée dans un espace à climatiser et une unité extérieure sont reliées, ledit climatiseur comprenant : un circuit de fluide frigorigène qui est conçu par un compresseur, une soupape de commutation de trajet d'écoulement, un échangeur de chaleur extérieur, une soupape d'expansion et un échangeur de chaleur intérieur qui sont reliés par une tuyauterie de fluide frigorigène ; une première soupape d'ouverture/fermeture qui est disposée entre l'orifice d'entrée ou l'orifice de sortie de l'échangeur de chaleur intérieur et la soupape de commutation de trajet d'écoulement dans le circuit de fluide frigorigène et disposée dans l'unité intérieure ; et une seconde soupape d'ouverture/fermeture qui est disposée entre l'autre orifice de l'échangeur de chaleur intérieur et la soupape d'expansion dans le circuit de fluide frigorigène et disposée dans l'unité intérieure.
PCT/JP2020/013900 2020-03-27 2020-03-27 Climatiseur WO2021192195A1 (fr)

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PCT/JP2020/013900 WO2021192195A1 (fr) 2020-03-27 2020-03-27 Climatiseur
JP2022510303A JP7241967B2 (ja) 2020-03-27 2020-03-27 空気調和機

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PCT/JP2020/013900 WO2021192195A1 (fr) 2020-03-27 2020-03-27 Climatiseur

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5923065U (ja) * 1982-08-04 1984-02-13 株式会社東芝 空気調和機
JPH09145191A (ja) * 1995-11-24 1997-06-06 Sanyo Electric Co Ltd 空気調和機
JP2000179958A (ja) * 1998-12-16 2000-06-30 Matsushita Electric Ind Co Ltd 空気調和装置
JP2005221167A (ja) * 2004-02-06 2005-08-18 Mitsubishi Electric Corp 空気調和装置
JP2010164270A (ja) * 2009-01-19 2010-07-29 Panasonic Corp 多室型空気調和機
US20140123685A1 (en) * 2012-11-02 2014-05-08 Jeonghun Kim Air conditioner and a method of controlling an air conditioner
WO2018037466A1 (fr) * 2016-08-22 2018-03-01 三菱電機株式会社 Dispositif à cycle de réfrigération

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2677184C (fr) 2007-02-01 2014-12-23 Sol-Gel Technologies Ltd. Compositions d'application topique comprenant un peroxyde et un retinoide

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5923065U (ja) * 1982-08-04 1984-02-13 株式会社東芝 空気調和機
JPH09145191A (ja) * 1995-11-24 1997-06-06 Sanyo Electric Co Ltd 空気調和機
JP2000179958A (ja) * 1998-12-16 2000-06-30 Matsushita Electric Ind Co Ltd 空気調和装置
JP2005221167A (ja) * 2004-02-06 2005-08-18 Mitsubishi Electric Corp 空気調和装置
JP2010164270A (ja) * 2009-01-19 2010-07-29 Panasonic Corp 多室型空気調和機
US20140123685A1 (en) * 2012-11-02 2014-05-08 Jeonghun Kim Air conditioner and a method of controlling an air conditioner
WO2018037466A1 (fr) * 2016-08-22 2018-03-01 三菱電機株式会社 Dispositif à cycle de réfrigération

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