WO2022215204A1 - Climatiseur - Google Patents

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Publication number
WO2022215204A1
WO2022215204A1 PCT/JP2021/014805 JP2021014805W WO2022215204A1 WO 2022215204 A1 WO2022215204 A1 WO 2022215204A1 JP 2021014805 W JP2021014805 W JP 2021014805W WO 2022215204 A1 WO2022215204 A1 WO 2022215204A1
Authority
WO
WIPO (PCT)
Prior art keywords
way valve
refrigerant
heat exchange
heat exchanger
air
Prior art date
Application number
PCT/JP2021/014805
Other languages
English (en)
Japanese (ja)
Inventor
孔明 仲島
祐介 安達
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 JP2023512582A priority Critical patent/JP7450807B2/ja
Priority to US18/549,229 priority patent/US20240151425A1/en
Priority to EP21936008.8A priority patent/EP4321820A4/fr
Priority to CN202180096528.1A priority patent/CN117083492A/zh
Priority to PCT/JP2021/014805 priority patent/WO2022215204A1/fr
Publication of WO2022215204A1 publication Critical patent/WO2022215204A1/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
    • 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
    • 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
    • F24F1/0007—Indoor units, e.g. fan coil units
    • F24F1/0068—Indoor units, e.g. fan coil units characterised by the arrangement of refrigerant piping outside the heat exchanger within the unit casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0234—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements
    • F25B2313/02341—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements during cooling
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0234—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements
    • F25B2313/02343—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements during dehumidification
    • 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
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0234—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements
    • F25B2313/02344—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in series arrangements during heating
    • 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
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02743—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using three four-way valves

Definitions

  • the present disclosure relates to air conditioners.
  • a heat exchanger When a heat exchanger is used as an evaporator, it is usually designed so that the direction of the air flowing outside the heat exchanger and the direction of the refrigerant flowing inside the heat exchanger are parallel. be.
  • the reason for this is as follows.
  • the flow velocity of the refrigerant In an evaporator through which a low-pressure gas-liquid two-phase or gas-phase refrigerant flows, the flow velocity of the refrigerant is high because the refrigerant has a low density. Therefore, pressure loss in the evaporator is greater than pressure loss in the condenser. Therefore, the saturation temperature at the evaporator outlet is lower than the saturation temperature at the evaporator inlet.
  • the present disclosure has been made in view of the above problems, and its purpose is to provide an air conditioner that can sufficiently dehumidify in the reheat dehumidification operation.
  • the air conditioner of the present disclosure includes a refrigerant circuit and an indoor unit fan.
  • the refrigerant circuit has a compressor, a first four-way valve, an outdoor heat exchanger, a first expansion valve, a second four-way valve, a third four-way valve, an indoor heat exchanger and a second expansion valve, and circulates the refrigerant. It is configured to allow
  • the indoor unit fan is configured to blow air to the indoor unit heat exchanger.
  • the indoor unit heat exchanger has a first heat exchange section and a second heat exchange section.
  • the refrigerant circuit includes the compressor, the first four-way valve, the outdoor unit heat exchanger, the first expansion valve, the second four-way valve, the third four-way valve, the first heat exchange section, the third four-way valve, the second The first four-way valve, the second four-way valve, and the third four-way valve are configured to be switched so that the refrigerant flows in the order of the expansion valve, the second heat exchange section, the second four-way valve, and the first four-way valve. .
  • the refrigerant circuit includes the compressor, the first four-way valve, the outdoor unit heat exchanger, the first expansion valve, the second four-way valve, the second heat exchange section, the second expansion valve, the third four-way valve, The first four-way valve, the second four-way valve, and the third four-way valve are configured to be switched so that the refrigerant flows in the order of the first heat exchange section, the third four-way valve, the second four-way valve, and the first four-way valve. ing.
  • the refrigerant flows parallel to the flow of air blown by the indoor unit fan in the first heat exchange section and the second heat exchange section.
  • the refrigerant flows parallel to the air flow in the first heat exchange section, and the refrigerant flows countercurrent to the air flow in the second heat exchange section.
  • the refrigerant flows parallel to the air flow in the first heat exchange section. Therefore, sufficient dehumidification can be achieved in the reheat dehumidification operation.
  • FIG. 4 is a refrigerant circuit diagram during cooling operation of the air conditioner according to Embodiment 1.
  • FIG. 4 is a Ph diagram during cooling operation of the air conditioner according to Embodiment 1.
  • FIG. 4 is a refrigerant circuit diagram during reheat dehumidification operation of the air conditioner according to Embodiment 1.
  • FIG. 4 is a Ph diagram during reheat dehumidification operation of the air conditioner according to Embodiment 1.
  • FIG. 4 is a refrigerant circuit diagram during heating operation of the air conditioner according to Embodiment 1.
  • FIG. 4 is a cross-sectional view schematically showing the configuration of the indoor unit of the air conditioner according to Embodiment 1 during cooling operation; 4 is a cross-sectional view schematically showing the configuration of the indoor unit of the air conditioner according to Embodiment 1 during reheat dehumidification operation;
  • FIG. 7 is a refrigerant circuit diagram during cooling operation of the air conditioner according to Embodiment 2;
  • FIG. 7 is a refrigerant circuit diagram during reheat dehumidification operation of the air conditioner according to Embodiment 2;
  • FIG. 7 is a refrigerant circuit diagram during heating operation of the air conditioner according to Embodiment 2;
  • Embodiment 1 A configuration of an air conditioner 100 according to Embodiment 1 will be described with reference to FIG.
  • the air conditioner 100 includes a refrigerant circuit RC, an outdoor unit fan 9, an indoor unit fan 10, and a control device 11.
  • the refrigerant circuit RC includes a compressor 1, a first four-way valve 2, an outdoor heat exchanger 3, a first expansion valve 4, a second four-way valve 5, a third four-way valve 6, and an indoor heat exchanger. It has a vessel 7, a second expansion valve 8, and a pipe P.
  • the indoor unit heat exchanger 7 has a first heat exchange section 7a and a second heat exchange section 7b.
  • the pipe P includes a first extension pipe P1 and a second extension pipe P2.
  • the refrigerant circuit RC includes a compressor 1, a first four-way valve 2, an outdoor heat exchanger 3, a first expansion valve 4, a second four-way valve 5, a third four-way valve 6, and an indoor heat exchanger.
  • a container 7 and a second expansion valve 8 are connected by a pipe P.
  • the refrigerant circuit RC is configured to circulate a refrigerant.
  • the air conditioner 100 includes an outdoor unit 101 and an indoor unit 102.
  • the outdoor unit 101 and the indoor unit 102 are connected by a first extension pipe P1 and a second extension pipe P2.
  • Compressor 1 first four-way valve 2 , outdoor heat exchanger 3 , first expansion valve 4 , second four-way valve 5 , outdoor fan 9 and controller 11 are housed in outdoor unit 101 .
  • the third four-way valve 6 , the indoor unit heat exchanger 7 , the second expansion valve 8 and the indoor unit fan 10 are housed in the indoor unit 102 .
  • the compressor 1 is configured to compress refrigerant.
  • the compressor 1 is configured to compress and discharge the sucked refrigerant.
  • Compressor 1 is configured, for example, to have a variable capacity.
  • Compressor 1 is configured, for example, to change its capacity by adjusting the rotational speed of compressor 1 based on an instruction from control device 11 .
  • the first four-way valve 2 is connected to the suction port and discharge port of the compressor 1, the outdoor unit heat exchanger 3, and the second four-way valve 5.
  • the first four-way valve 2 is configured to switch the flow of refrigerant so that the refrigerant compressed by the compressor 1 flows to the outdoor unit heat exchanger 3 or the indoor unit heat exchanger 7 .
  • the first four-way valve 2 switches the flow of refrigerant so that the refrigerant compressed by the compressor 1 flows to the indoor unit heat exchanger 7, the first four-way valve 2 passes through the second four-way valve 5 The refrigerant flows through the indoor unit heat exchanger 7 .
  • the first four-way valve 2 is configured to flow the refrigerant discharged from the compressor 1 to the outdoor unit heat exchanger 3 during cooling operation and reheat dehumidification operation.
  • the first four-way valve 2 is configured to flow the refrigerant discharged from the compressor 1 to the indoor unit heat exchanger 7 during heating operation.
  • the outdoor heat exchanger 3 is configured to exchange heat between the refrigerant flowing inside the outdoor heat exchanger 3 and the air flowing outside the outdoor heat exchanger 3 .
  • the outdoor unit heat exchanger 3 is configured to function as a condenser that condenses the refrigerant during the cooling operation and during the reheat dehumidifying operation.
  • the outdoor unit heat exchanger 3 is configured to function as an evaporator that evaporates refrigerant during heating operation.
  • the outdoor unit heat exchanger 3 is, for example, a fin-and-tube heat exchanger having a plurality of fins and heat transfer tubes passing through the plurality of fins.
  • the first expansion valve 4 is configured to reduce the pressure by expanding the refrigerant condensed in the condenser.
  • the first expansion valve 4 is configured to reduce the pressure of the refrigerant condensed by the outdoor unit heat exchanger 3 during cooling operation and reheat dehumidification operation.
  • the first expansion valve 4 is configured to reduce the pressure of the refrigerant condensed by the indoor unit heat exchanger 7 during heating operation.
  • the first expansion valve is, for example, an electromagnetic expansion valve.
  • the second four-way valve 5 is connected to the first four-way valve 2, the first expansion valve 4, the third four-way valve 6, and the second heat exchange portion 7b of the indoor unit heat exchanger 7.
  • the second four-way valve 5 allows the refrigerant flowing out of the first expansion valve 4 to flow through the third four-way valve 6 to the first heat exchange portion 7a of the indoor unit heat exchanger 7, and the indoor unit heat exchange. It is configured to switch the flow of the refrigerant so that the refrigerant flowing out of the second heat exchange portion 7 b of the vessel 7 flows to the first four-way valve 2 .
  • the second four-way valve 5 allows the refrigerant flowing out of the first expansion valve 4 to flow to the second heat exchange portion 7b of the indoor heat exchanger 7 and the first heat exchange of the indoor heat exchanger 7. It is configured to switch the flow of the refrigerant so that the refrigerant that has flowed out of the portion 7 a and passed through the third four-way valve 6 flows to the first four-way valve 2 .
  • the second four-way valve 5 flows the refrigerant discharged from the compressor 1 and passed through the first four-way valve 2 to the second heat exchange portion 7b of the indoor heat exchanger 7, and It is configured to switch the flow of the refrigerant so that the refrigerant that has flowed out of the first heat exchange portion 7 a and passed through the third four-way valve 6 flows to the first expansion valve 4 .
  • the third four-way valve 6 is connected to the second four-way valve 5 , the inlet and outlet of the first heat exchange section 7 a of the indoor unit heat exchanger 7 , and the second expansion valve 8 .
  • the third four-way valve 6 allows the refrigerant that has flowed out of the second four-way valve 5 to flow through the heat transfer tube on the windward side of the first heat exchange section 7a and flow out from the heat transfer tube on the leeward side of the first heat exchange section 7a.
  • the flow of the refrigerant is switched so as to flow the refrigerant through the second expansion valve 8 to the heat transfer pipe on the windward side of the second heat exchange portion 7 b of the indoor unit heat exchanger 7 .
  • the third four-way valve 6 allows the refrigerant flowing out of the second expansion valve 8 to flow through the heat transfer tube on the windward side of the first heat exchange section 7a and the heat transfer tube on the leeward side of the first heat exchange section 7a. It is configured to switch the flow of the refrigerant so that the refrigerant flowing out from the second four-way valve 5 flows to the second four-way valve 5 .
  • the third four-way valve 6 allows the refrigerant that has flowed out of the second expansion valve 8 to flow through the heat transfer tube on the leeward side of the first heat exchange section 7a and flow out from the heat transfer tube on the windward side of the first heat exchange section 7a. It is configured to switch the flow of the refrigerant so that the discharged refrigerant flows to the second four-way valve 5 .
  • the indoor heat exchanger 7 is configured to exchange heat between the refrigerant flowing inside the indoor heat exchanger 7 and the air flowing outside the indoor heat exchanger 7 .
  • the indoor unit heat exchanger 7 is configured to function as an evaporator that evaporates the refrigerant during cooling operation.
  • Both the first heat exchange portion 7a and the second heat exchange portion 7b are configured to function as evaporators that evaporate refrigerant during cooling operation.
  • the indoor unit heat exchanger 7 is configured to function as an evaporator that evaporates the refrigerant and a condenser that condenses the refrigerant during reheat dehumidification operation.
  • the first heat exchange portion 7a is configured to function as an evaporator that evaporates the refrigerant during the reheat dehumidification operation.
  • the second heat exchange portion 7b is configured to function as a condenser that condenses the refrigerant during the reheat dehumidification operation.
  • the indoor unit heat exchanger 7 is configured to function as a condenser that condenses refrigerant during heating operation. Both the first heat exchange portion 7a and the second heat exchange portion 7b are configured to function as condensers that condense the refrigerant during heating operation.
  • the indoor unit heat exchanger 7 is, for example, a fin-and-tube heat exchanger having a plurality of fins and heat transfer tubes passing through the plurality of fins.
  • the first heat exchange section 7a and the second heat exchange section 7b are arranged side by side in the direction of the flow of the air blown by the indoor unit fan 10.
  • the first heat exchanging portion 7a is arranged on the windward side of the air flow blown by the indoor unit fan 10 relative to the second heat exchanging portion 7b.
  • the second heat exchange portion 7b is arranged on the leeward side of the air flow blown by the indoor unit fan 10 relative to the first heat exchange portion 7a.
  • the first heat exchange section 7a has a heat transfer tube on the windward side and a heat transfer tube on the leeward side.
  • the heat transfer tube on the windward side is connected to the heat transfer tube on the leeward side.
  • the first heat exchange section 7a is configured such that the refrigerant flows from the heat transfer tube on the windward side to the heat transfer tube on the leeward side during cooling operation and reheat dehumidification operation.
  • the refrigerant and air flowing through the first heat exchange portion 7a flow parallel to each other.
  • the first heat exchange portion 7a is configured such that the refrigerant flows from the heat transfer tube on the leeward side to the heat transfer tube on the windward side during the heating operation.
  • the refrigerant and air flowing through the first heat exchanging portion 7a flow in opposite directions.
  • the second heat exchange section 7b has a heat transfer tube on the windward side and a heat transfer tube on the leeward side.
  • the heat transfer tube on the windward side is connected to the heat transfer tube on the leeward side.
  • the second heat exchange portion 7b is configured such that the refrigerant flows from the heat transfer tube on the windward side to the heat transfer tube on the leeward side during cooling operation.
  • the refrigerant and air flowing through the second heat exchange portion 7b flow in parallel.
  • the second heat exchange portion 7b is configured such that the refrigerant flows from the heat transfer tube on the leeward side to the heat transfer tube on the windward side during the reheat dehumidification operation and the heating operation.
  • the refrigerant and air flowing through the second heat exchange portion 7b flow countercurrently.
  • the second expansion valve 8 is configured to reduce the pressure of the refrigerant condensed in the second heat exchange portion 7b of the indoor unit heat exchanger 7 during reheat dehumidification operation.
  • the second expansion valve 8 is configured to open the opening of the valve to suppress the decompression of the refrigerant during the cooling operation and the heating operation.
  • the second expansion valve 8 is, for example, an electromagnetic expansion valve.
  • the refrigerant circuit RC is composed of the compressor 1, the first four-way valve 2, the outdoor unit heat exchanger 3, the first expansion valve 4, the second four-way valve 5, the third four-way valve 6, and the first heat exchange section 7a. , the third four-way valve 6, the second expansion valve 8, the second heat exchange portion 7b, the second four-way valve 5, and the first four-way valve 2 so that the refrigerant flows in this order. , and the third four-way valve 6 are configured to be switched.
  • the refrigerant circuit RC is composed of the compressor 1, the first four-way valve 2, the outdoor unit heat exchanger 3, the first expansion valve 4, the second four-way valve 5, the second heat exchange section 7b, the second expansion The first four-way valve 2, the second The four-way valve 5 and the third four-way valve 6 are configured to be switched.
  • the refrigerant circuit RC is composed of the compressor 1, the first four-way valve 2, the second four-way valve 5, the second heat exchange section 7b, the second expansion valve 8, the third four-way valve 6, and the first heat exchange section 7a.
  • third four-way valve 6, second four-way valve 5, first expansion valve 4, outdoor unit heat exchanger 3, first four-way valve 2, first four-way valve 2, second four-way valve 5 , and the third four-way valve 6 are configured to be switched.
  • the outdoor unit fan 9 is configured to be able to blow air to the outdoor unit heat exchanger 3. That is, the outdoor unit fan 9 is configured to supply outdoor air to the outdoor unit heat exchanger 3 .
  • the indoor unit fan 10 is configured to be able to blow air to the indoor unit heat exchanger 7 . That is, the indoor unit fan 10 is configured to supply indoor air to the indoor unit heat exchanger 7 .
  • the refrigerant flows parallel to the flow of air blown by the indoor unit fan 10 in the first heat exchange section 7a and the second heat exchange section 7b.
  • the refrigerant flows parallel to the flow of air blown by the indoor unit fan 10
  • the second heat exchange portion 7b the flow is parallel to the air flow.
  • the refrigerant flows countercurrently.
  • the refrigerant flows countercurrently to the air flow blown by the indoor unit fan 10 .
  • the control device 11 is configured to perform calculations, instructions, etc. to control each device of the air conditioner 100 .
  • the control device 11 controls the compressor 1, the first four-way valve 2, the first expansion valve 4, the second four-way valve 5, the third four-way valve 6, the second expansion valve 8, the outdoor unit fan 9, the indoor unit fan 10, and the like. electrically connected and configured to control their operation.
  • FIG. 1 In FIGS. 1 to 5, solid arrows indicate the flow of refrigerant, and white arrows indicate the flow of air.
  • the air conditioner 100 according to Embodiment 1 can selectively perform a cooling operation, a reheat dehumidifying operation, and a heating operation.
  • the refrigerant circuit RC is composed of the compressor 1, the first four-way valve 2, the outdoor unit heat exchanger 3, the first expansion valve 4, the second four-way valve 5, the third four-way valve 6, and the indoor unit heat exchanger 7. Refrigerant circulates in the order of the first heat exchange portion 7a, the third four-way valve 6, the second expansion valve 8, the second heat exchange portion 7b of the indoor unit heat exchanger 7, the second four-way valve 5, and the first four-way valve 2. do.
  • the high-pressure gas refrigerant discharged from the compressor 1 flows into the outdoor unit heat exchanger 3 via the first four-way valve 2 .
  • the outdoor unit heat exchanger 3 heat is exchanged between the high-temperature gas refrigerant and the air blown by the outdoor unit fan 9, whereby the refrigerant releases heat and changes to liquid refrigerant.
  • Liquid refrigerant flows into the first expansion valve 4 from the outdoor unit heat exchanger 3 .
  • the liquid refrigerant is decompressed and becomes a gas-liquid two-phase refrigerant.
  • the gas-liquid two-phase refrigerant flows from the first expansion valve 4 into the second four-way valve 5 .
  • the flow path of the second four-way valve 5 is switched so that the first expansion valve 4 and the first extension pipe P1 are connected.
  • the gas-liquid two-phase refrigerant flows from the second four-way valve 5 into the third four-way valve 6 through the first extension pipe P1.
  • the flow path is switched so that the first extension pipe P1 and the heat transfer pipe on the windward side of the first heat exchange section 7a of the indoor unit heat exchanger 7 are connected.
  • the first heat exchange portion 7a of the indoor unit heat exchanger 7 After heat exchange is performed between the refrigerant flowing into the heat transfer tube on the windward side of the first heat exchange portion 7a of the indoor unit heat exchanger 7 and the air blown by the indoor unit fan 10, the first heat exchange portion The refrigerant flows out from the heat transfer tube on the leeward side of 7a. At this time, the direction of the air flowing outside the first heat exchanging portion 7a and the direction of the refrigerant flowing inside the first heat exchanging portion 7a are the same. That is, in the first heat exchange portion 7a, the refrigerant flows parallel to the air flow.
  • the refrigerant flows into the second expansion valve 8 after flowing into the third four-way valve 6 again from the first heat exchange portion 7a.
  • the degree of opening of the second expansion valve 8 is set to be open. Therefore, since pressure loss of the refrigerant is unlikely to occur in the second expansion valve 8 , the refrigerant directly flows from the second expansion valve 8 into the heat transfer pipe on the windward side of the second heat exchange portion 7 b of the indoor unit heat exchanger 7 .
  • the air cooled in the first heat exchange section 7a is blown to the second heat exchange section 7b.
  • the direction of the air flowing outside the second heat exchanging portion 7b and the direction of the refrigerant flowing inside the second heat exchanging portion 7b are the same. That is, in the second heat exchange portion 7b, the refrigerant flows parallel to the air flow.
  • the gaseous refrigerant evaporated in the second heat exchange section 7b flows into the second four-way valve 5 from the second heat exchange section 7b via the second extension pipe P2.
  • the flow path is switched so that the second extension pipe P2 and the first four-way valve 2 are connected.
  • Gas refrigerant flows from the second four-way valve 5 into the suction port of the compressor 1 via the first four-way valve 2 .
  • the reheat dehumidifying operation of the air conditioner 100 will be described with reference to FIGS. 3 and 4.
  • Refrigerant in the order of the exchange portion 7b, the second expansion valve 8, the third four-way valve 6, the first heat exchange portion 7a of the indoor unit heat exchanger 7, the third four-way valve 6, the second four-way valve 5, and the first four-way valve 2 circulates.
  • the second four-way valve 5 and the third four-way valve 6 are switched from the cooling operation shown in FIG. 1 to the reheat dehumidification operation.
  • the liquid refrigerant that has undergone heat exchange with the air blown by the outdoor unit fan 9 in the outdoor unit heat exchanger 3 flows into the first expansion valve 4 .
  • the temperature of the refrigerant at the outlet of the first expansion valve 4 can be made higher than the temperature of the indoor air.
  • Refrigerant flows from the first expansion valve 4 into the second four-way valve 5 .
  • the flow path of the second four-way valve 5 is switched so that the first expansion valve 4 and the second extension pipe P2 are connected.
  • the refrigerant passes from the second four-way valve 5 through the second extension pipe P2 and flows into the second heat exchange portion 7b of the indoor unit heat exchanger 7 .
  • the refrigerant flows from the heat transfer tube on the leeward side to the heat transfer tube on the windward side in the second heat exchange portion 7 b of the indoor unit heat exchanger 7 .
  • the refrigerant heats the air cooled in the first heat exchange portion 7a in the second heat exchange portion 7b.
  • the air flowing outside the second heat exchanging portion 7b and the refrigerant flowing inside the second heat exchanging portion 7b are opposite to each other. That is, in the second heat exchanging portion 7b, the refrigerant flows countercurrently to the air flow.
  • the refrigerant flows into the second expansion valve 8 from the second heat exchange portion 7b.
  • the refrigerant flows into the third four-way valve 6 after being decompressed in the second expansion valve 8 .
  • the refrigerant flows from the third four-way valve 6 into the heat transfer tubes on the windward side of the first heat exchange section 7a.
  • the refrigerant flows from the heat transfer tube on the windward side to the heat transfer tube on the leeward side in the first heat exchange section 7a.
  • the refrigerant cools the air in the first heat exchange portion 7a.
  • the direction of the air flowing outside the first heat exchanging portion 7a and the direction of the refrigerant flowing inside the first heat exchanging portion 7a are the same. That is, in the first heat exchange portion 7a, the refrigerant flows parallel to the air flow.
  • the refrigerant that has cooled the indoor air flows from the first heat exchange portion 7a into the third four-way valve 6 again, passes through the first extension pipe P1, and flows into the second four-way valve 5.
  • the flow path is switched so that the first extension pipe P1 and the first four-way valve 2 are connected.
  • the refrigerant flows from the second four-way valve 5 through the first four-way valve 2 into the suction port of the compressor 1 .
  • the refrigerant circuit RC includes the compressor 1, the first four-way valve 2, the second four-way valve 5, the second heat exchange portion 7b of the indoor unit heat exchanger 7, the second expansion valve 8, and the third four-way valve 6. , the first heat exchange portion 7a of the indoor unit heat exchanger 7, the third four-way valve 6, the second four-way valve 5, the first expansion valve 4, the outdoor unit heat exchanger 3, and the first four-way valve 2, in this order. do.
  • the first four-way valve 2 is switched from the cooling operation shown in FIG.
  • the high-pressure gas refrigerant discharged from the compressor 1 flows through the first four-way valve 2 and the second four-way valve 5 into the second heat exchange section 7b of the indoor unit heat exchanger 7 .
  • the refrigerant is condensed in the second heat exchange portion 7b.
  • the direction of the air flowing outside the second heat exchanging portion 7b and the direction of the refrigerant flowing inside the second heat exchanging portion 7b are opposite. That is, in the second heat exchanging portion 7b, the refrigerant flows countercurrently to the air flow.
  • the refrigerant flows into the second expansion valve 8 from the second heat exchange portion 7b.
  • the degree of opening of the second expansion valve 8 is set to be open.
  • the refrigerant flows from the second expansion valve 8 through the third four-way valve 6 into the first heat exchange portion 7 a of the indoor unit heat exchanger 7 .
  • the refrigerant is condensed in the first heat exchange portion 7a.
  • the air flowing outside the first heat exchanging portion 7a and the refrigerant flowing inside the first heat exchanging portion 7a are opposite to each other. That is, in the first heat exchanging portion 7a, the refrigerant flows countercurrently to the air flow.
  • the refrigerant flows from the first heat exchange portion 7a into the first expansion valve 4 via the third four-way valve 6 and the second four-way valve 5 .
  • the refrigerant is decompressed in the first expansion valve 4 .
  • the refrigerant flows into the outdoor unit heat exchanger 3 from the first expansion valve 4 .
  • the refrigerant evaporated in the outdoor unit heat exchanger 3 flows into the suction port of the compressor 1 via the first four-way valve 2 .
  • FIG. 6 and 7 solid arrows indicate the flow of refrigerant, and white arrows indicate the flow of air.
  • the configuration of the indoor unit 102 shown in FIGS. 6 and 7 is an example, and the configuration is not limited to this configuration.
  • the indoor unit 102 has a housing 102a.
  • a suction port 102b for taking in air is provided on the front and top surfaces of the housing 102a.
  • a blowout port 102c for blowing out air is provided on the bottom surface of the housing 102a.
  • the first heat exchange portion 7a is arranged such that the air sucked from the suction port 102b passes through the first heat exchange portion 7a before the second heat exchange portion 7b.
  • the second heat exchange portion 7b is arranged so that the air passing through the first heat exchange portion 7a passes therethrough.
  • An indoor unit fan 10 is arranged behind the second heat exchange portion 7b.
  • Indoor unit fan 10 is, for example, a cross-flow fan. The air that has passed through the first heat exchanging portion 7a, the second heat exchanging portion 7b, and the indoor unit fan 10 is blown into the room from the air outlet 102c.
  • the air conditioner 100 according to Embodiment 1 in the reheat dehumidification operation, the refrigerant flows parallel to the air flow in the first heat exchange section 7a. Therefore, in the first heat exchange section 7a functioning as an evaporator during the reheat dehumidification operation, the refrigerant can flow parallel to the air flow. Thereby, air can be efficiently cooled in the 1st heat exchange part 7a. Therefore, sufficient dehumidification can be achieved in the reheat dehumidification operation.
  • the reheat dehumidification operation enables cooling operation with a controlled sensible heat factor (SHF).
  • SHF controlled sensible heat factor
  • the first heat exchange section 7a functioning as an evaporator and the second heat exchange section 7b functioning as a condenser are arranged along the direction of the air flow, the first heat It is not necessary to separately blow air to the exchange portion 7a and the second heat exchange portion 7b. Therefore, an increase in input to the indoor unit fan 10 can be suppressed.
  • the refrigerant flows countercurrently to the air flow in the second heat exchange section 7b that functions as a condenser. Therefore, the performance of the condenser can be improved.
  • Embodiment 2 has the same configuration, operation, and effects as those of the air conditioner 100 according to Embodiment 1 unless otherwise specified.
  • the air conditioner 100 according to Embodiment 2 differs from the air conditioner 100 according to Embodiment 1 in the position of the second four-way valve 5 .
  • FIG. 8 in the air conditioner 100 according to Embodiment 2, the second four-way valve 5 is housed in the indoor unit 102 .
  • the refrigerant circuit RC has a first extension pipe P1 and a second extension pipe P2.
  • the first extension pipe P ⁇ b>1 connects the first expansion valve 4 and the second four-way valve 5 .
  • the second extension pipe P2 connects the first four-way valve 2 and the second four-way valve 5 .
  • the first extension pipe P1 has an inner diameter smaller than that of the second extension pipe P2.
  • the air conditioner 100 according to Embodiment 2 operates similarly to the air conditioner 100 according to Embodiment 1 in cooling operation, reheat dehumidification operation, and heating operation. .
  • the low-pressure gas-liquid two-phase refrigerant containing a large amount of the liquid phase throttled by the first expansion valve 4 flows into the first extension pipe P1, and the indoor unit 102 Refrigerant flows to During the reheat dehumidification operation, the low-pressure gas refrigerant heat-exchanged in the indoor unit 102 flows into the first extension pipe P1.
  • the first extension pipe P1 has an inner diameter smaller than that of the second extension pipe P2, assuming that a liquid refrigerant or a gas-liquid two-phase refrigerant containing a large amount of liquid phase flows therein.
  • the gas refrigerant flows into the first extension pipe P1 during the reheat dehumidification operation.
  • the flow velocity of the refrigerant becomes faster than when the liquid-phase refrigerant flows, so the pressure loss of the refrigerant in the pipe increases.
  • the first extension pipe P ⁇ b>1 connects the first expansion valve 4 and the second four-way valve 5 .
  • the second extension pipe P2 connects the first four-way valve 2 and the second four-way valve 5 .
  • the first extension pipe P1 has an inner diameter smaller than that of the second extension pipe P2. Therefore, the gas-liquid two-phase refrigerant throttled by the first expansion valve 4 flows into the first extension pipe P1 in both the cooling operation and the reheat dehumidification operation. Therefore, in the reheat dehumidification operation, it is possible to suppress the occurrence of pressure loss in the refrigerant compared to the case where the gas refrigerant flows through the first extension pipe P1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

L'invention concerne un climatiseur (100) qui comprend un circuit de fluide frigorigène (RC) et un ventilateur interne (10). Le circuit de fluide frigorigène (RC) comporte un compresseur (1), une première soupape à quatre voies (2), un échangeur de chaleur externe (3), un premier détendeur (4), une deuxième soupape à quatre voies (5), une troisième soupape à quatre voies (6), un échangeur de chaleur interne (7), et un second détendeur (8), et est conçu pour faire circuler un fluide frigorigène. Le ventilateur interne (10) est conçu pour pouvoir souffler de l'air vers l'échangeur de chaleur interne (7). L'échangeur de chaleur interne (7) comporte une première unité d'échange de chaleur (7a) et une seconde unité d'échange de chaleur (7b). Pendant une opération de refroidissement, un flux de fluide frigorigène circule, dans la première unité d'échange de chaleur (7a) et la seconde unité d'échange de chaleur (7b), en parallèle à un flux d'air soufflé par le ventilateur interne (10). Pendant une opération de réchauffage et de déshumidification, un flux de fluide frigorigène s'écoule en parallèle à un flux d'air dans la première unité d'échange de chaleur (7a), et un flux de fluide frigorigène s'écoule à l'encontre d'un flux d'air dans la seconde unité d'échange de chaleur (7b).
PCT/JP2021/014805 2021-04-07 2021-04-07 Climatiseur WO2022215204A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2023512582A JP7450807B2 (ja) 2021-04-07 2021-04-07 空気調和機
US18/549,229 US20240151425A1 (en) 2021-04-07 2021-04-07 Air-conditioner
EP21936008.8A EP4321820A4 (fr) 2021-04-07 2021-04-07 Climatiseur
CN202180096528.1A CN117083492A (zh) 2021-04-07 2021-04-07 空调机
PCT/JP2021/014805 WO2022215204A1 (fr) 2021-04-07 2021-04-07 Climatiseur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/014805 WO2022215204A1 (fr) 2021-04-07 2021-04-07 Climatiseur

Publications (1)

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WO2022215204A1 true WO2022215204A1 (fr) 2022-10-13

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Application Number Title Priority Date Filing Date
PCT/JP2021/014805 WO2022215204A1 (fr) 2021-04-07 2021-04-07 Climatiseur

Country Status (5)

Country Link
US (1) US20240151425A1 (fr)
EP (1) EP4321820A4 (fr)
JP (1) JP7450807B2 (fr)
CN (1) CN117083492A (fr)
WO (1) WO2022215204A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5060840U (fr) * 1973-09-28 1975-06-04
JP2009109064A (ja) * 2007-10-29 2009-05-21 Hitachi Appliances Inc 空気調和機
JP2020125855A (ja) 2019-02-01 2020-08-20 ダイキン工業株式会社 空気調和機

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5060840B2 (ja) 2007-06-20 2012-10-31 矢崎総業株式会社 発光指針計器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5060840U (fr) * 1973-09-28 1975-06-04
JP2009109064A (ja) * 2007-10-29 2009-05-21 Hitachi Appliances Inc 空気調和機
JP2020125855A (ja) 2019-02-01 2020-08-20 ダイキン工業株式会社 空気調和機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4321820A4

Also Published As

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EP4321820A4 (fr) 2024-05-29
CN117083492A (zh) 2023-11-17
US20240151425A1 (en) 2024-05-09
JPWO2022215204A1 (fr) 2022-10-13
EP4321820A1 (fr) 2024-02-14
JP7450807B2 (ja) 2024-03-15

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