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WO2024070872A1 - Climatiseur - Google Patents

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Publication number
WO2024070872A1
WO2024070872A1 PCT/JP2023/034206 JP2023034206W WO2024070872A1 WO 2024070872 A1 WO2024070872 A1 WO 2024070872A1 JP 2023034206 W JP2023034206 W JP 2023034206W WO 2024070872 A1 WO2024070872 A1 WO 2024070872A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant
heat exchanger
liquid
gas
way valve
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2023/034206
Other languages
English (en)
Japanese (ja)
Inventor
智充 山口
恵介 三苫
誠心 沖野
裕介 土井
道明 中西
峻也 楠本
優好 平沢
泰明 兼子
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Thermal Systems Ltd
Original Assignee
Mitsubishi Heavy Industries Thermal Systems Ltd
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 Mitsubishi Heavy Industries Thermal Systems Ltd filed Critical Mitsubishi Heavy Industries Thermal Systems Ltd
Priority to EP23872099.9A priority Critical patent/EP4589215A1/fr
Priority to AU2023353614A priority patent/AU2023353614A1/en
Publication of WO2024070872A1 publication Critical patent/WO2024070872A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • 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
    • 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
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way valves

Definitions

  • the refrigeration cycle includes an evaporator, a condenser, a compressor, and an expansion valve.
  • the refrigerant flows through the compressor, condenser, expansion valve, and evaporator in that order.
  • the liquid-phase refrigerant and the gas-phase refrigerant In order to ensure thermal efficiency, it is desirable for the liquid-phase refrigerant and the gas-phase refrigerant to flow in opposite directions in a countercurrent state within the liquid-gas heat exchanger. Therefore, in the device described in Patent Document 1 below, the direction of the refrigerant flowing into the liquid-gas heat exchanger can be appropriately changed by a four-way valve between cooling operation and heating operation.
  • This disclosure has been made to solve the above problems, and aims to provide an air conditioner with improved operating efficiency.
  • the air conditioner according to the present disclosure comprises a refrigeration cycle having an outdoor heat exchanger, an indoor heat exchanger, a compressor, and an expansion valve through which a refrigerant flows in sequence, a first four-way valve that enables heating operation and cooling operation by switching the flow direction of the refrigerant, a liquid-gas heat exchanger that exchanges heat between a gas refrigerant on the low pressure side of the refrigeration cycle and a liquid refrigerant on the high pressure side, and a second four-way valve that switches the flow of the refrigerant so that the gas refrigerant and the liquid refrigerant flow in counter directions in the liquid-gas heat exchanger in both the heating operation and the cooling operation, and the second four-way valve is disposed in an area through which the gaseous refrigerant on the low pressure side of the refrigeration cycle flows.
  • the air conditioner according to the present disclosure comprises a refrigeration cycle having an outdoor heat exchanger, an indoor heat exchanger, a compressor, and an expansion valve through which a refrigerant flows in sequence; a first four-way valve that enables heating operation and cooling operation by switching the flow direction of the refrigerant; a liquid-gas heat exchanger that exchanges heat between a gas refrigerant on the low pressure side of the refrigeration cycle and a liquid refrigerant on the high pressure side; a second four-way valve that switches the flow of the refrigerant so that the gas refrigerant and the liquid refrigerant flow in countercurrent flow in the liquid-gas heat exchanger in both the heating operation and the cooling operation; and an accumulator that is provided upstream of the compressor and separates the refrigerant into gas and liquid, and the liquid-gas heat exchanger is disposed between the accumulator and the compressor.
  • This disclosure makes it possible to provide an air conditioner with improved operating efficiency.
  • FIG. 2 is a circuit diagram of the air conditioner according to the first embodiment of the present disclosure, illustrating the flow of refrigerant during cooling operation.
  • FIG. 2 is a circuit diagram of the air conditioner according to the first embodiment of the present disclosure, showing the flow of refrigerant during heating operation.
  • FIG. 11 is a circuit diagram of an air conditioner according to a second embodiment of the present disclosure, illustrating the flow of refrigerant during cooling operation.
  • FIG. 11 is a circuit diagram of an air conditioner according to a second embodiment of the present disclosure, illustrating the flow of refrigerant during heating operation.
  • FIG. 11 is a circuit diagram showing a modified example of the air conditioner according to the second embodiment of the present disclosure.
  • the air conditioner 1 is a device that is installed in a building such as a house or in transportation machinery such as an automobile, and adjusts the indoor temperature to a specified value.
  • the air conditioner 1 includes a refrigeration cycle 10, a first four-way valve 20, a liquid-gas heat exchanger 30, and a second four-way valve 40.
  • the refrigeration cycle 10 is a circuit for performing heat exchange between the indoor air and the refrigerant, and between the outdoor air and the refrigerant, by compressing and expanding the refrigerant that flows through each device of the refrigeration cycle 10 in sequence.
  • the refrigeration cycle 10 has an indoor heat exchanger 11, an indoor fan 12, an outdoor heat exchanger 13, an outdoor fan 14, a compressor 15, an accumulator 16, a first expansion valve 17 (expansion valve), a second expansion valve 18 (expansion valve), a first flow path 51, a second flow path 52, a compressor flow path 53, and a low-pressure gas flow path 54.
  • the indoor heat exchanger 11 is disposed on the first flow path 51.
  • the first flow path 51 is a flow path that connects between the first four-way valve 20 and the liquid-gas heat exchanger 30, which will be described later.
  • the inside of the first flow path 51 is filled with a refrigerant.
  • the indoor heat exchanger 11 exchanges heat between the refrigerant flowing through the first flow path 51 and the indoor air.
  • the indoor heat exchanger 11 is, for example, a fin-and-tube type heat exchanger.
  • An indoor fan 12 is provided near the indoor heat exchanger 11. By operating the indoor fan 12, the indoor air is forcibly supplied to the indoor heat exchanger 11.
  • a first expansion valve 17 is disposed on the first flow path 51 at a position on the liquid-gas heat exchanger 30 side of the indoor heat exchanger 11.
  • the first expansion valve 17 is, for example, an electromagnetic expansion valve, and its opening is adjusted by an electrical signal sent from the outside.
  • the first expansion valve 17 is used to expand the refrigerant flowing in the first flow path 51 during cooling operation, thereby reducing its pressure.
  • the outdoor heat exchanger 13 is disposed on the second flow path 52.
  • the second flow path 52 is a flow path that connects the first four-way valve 20 and the liquid-gas heat exchanger 30, and is a flow path provided separately from the first flow path 51.
  • the second flow path 52 is filled with a refrigerant.
  • the outdoor heat exchanger 13 exchanges heat between the refrigerant flowing through the second flow path 52 and the outdoor air.
  • the outdoor heat exchanger 13 is, for example, a fin-and-tube type heat exchanger.
  • An outdoor fan 14 is provided near the outdoor heat exchanger 13. By operating the outdoor fan 14, outdoor air is forcibly supplied to the outdoor heat exchanger 13.
  • a second expansion valve 18 is disposed on the second flow path 52 at a position on the liquid-gas heat exchanger 30 side of the outdoor heat exchanger 13.
  • the second expansion valve 18 is, for example, an electromagnetic expansion valve, and its opening is adjusted by an electrical signal sent from the outside.
  • the second expansion valve 18 is used to expand the refrigerant flowing in the second flow path 52 during heating operation, thereby reducing its pressure.
  • the compressor 15 and the accumulator 16 are provided on the compressor flow path 53.
  • the compressor flow path 53 is a flow path that connects the liquid-gas heat exchanger 30 and the first four-way valve 20, and is a flow path different from the first flow path 51 and the second flow path 52 described above.
  • the compressor 15 compresses the gas refrigerant in the compressor flow path 53 to generate a high-temperature, high-pressure gas refrigerant.
  • a scroll compressor or a rotary compressor is preferably used as the compressor 15.
  • the accumulator 16 is disposed adjacent to the upstream side of the compressor 15 on the compressor flow path 53.
  • the accumulator 16 separates the refrigerant into gas and liquid, sends only the gas phase component to the compressor 15, and stores the liquid phase component.
  • the liquid phase component stored in the accumulator 16 also contains lubricating oil mixed with the refrigerant.
  • the low-pressure gas flow path 54 connects the first four-way valve 20 and the liquid-gas heat exchanger 30 in parallel with the compressor flow path 53.
  • the second four-way valve 40 which will be described later, is disposed on the low-pressure gas flow path 54.
  • the first four-way valve 20 switches the flow direction of the refrigerant by switching the connection state of the first flow path 51, the second flow path 52, the compressor flow path 53, and the low-pressure gas flow path 54.
  • Fig. 1 shows the open state of the first four-way valve 20 during cooling operation. Specifically, the compressor flow path 53 and the second flow path 52 are connected, and the first flow path 51 and the low-pressure gas flow path 54 are connected. The state during heating operation will be described later with reference to Fig. 2.
  • the liquid-gas heat exchanger 30 is provided at a position connecting an end of the first flow path 51 on the first expansion valve 17 side and an end of the second flow path 52 on the second expansion valve 18 side.
  • the liquid-gas heat exchanger 30 also connects the low-pressure gas flow path 54 and the compressor flow path 53.
  • heat is exchanged between a high-temperature, high-pressure liquid refrigerant flowing from the second flow path 52 to the first flow path 51 and a low-temperature, low-pressure gas refrigerant flowing from the low-pressure gas flow path 54 to the compressor flow path 53.
  • the flow directions of these two refrigerants are determined so that they flow in opposite directions to each other, that is, so that they flow in countercurrents.
  • the second four-way valve 40 switches the flow of refrigerant so that the two refrigerant flows in the liquid-gas heat exchanger 30 are counterflows both during heating operation and cooling operation. Specifically, the second four-way valve 40 switches the open states of the low-pressure gas flow path 54 and the compressor flow path 53, and the liquid-gas heat exchanger 30. During cooling operation as shown in Fig. 1, the refrigerant that has passed through the low-pressure gas flow path 54 passes through the liquid-gas heat exchanger 30 and heads toward the compressor flow path 53. At this time, the open state of the second four-way valve 40 is switched so that the flow direction of the refrigerant is opposite to the flow direction of the refrigerant from the second flow path 52 toward the first flow path 51.
  • the second four-way valve 40 is provided in an area where low-pressure gas refrigerant normally flows (i.e., on the low-pressure gas flow path 54). In other words, it is preferable that the second four-way valve 40 is provided between the indoor heat exchanger 11 and the compressor 15. More preferably, the second four-way valve 40 is provided between the first four-way valve 20 and the liquid-gas heat exchanger 30.
  • FIG. 1 shows the circuit state of the air conditioner 1 during cooling operation.
  • the gas refrigerant compressed by the compressor 15 to a high temperature and high pressure passes through the first four-way valve 20 and flows to the outdoor heat exchanger 13 on the second flow path 52.
  • the gas refrigerant that has exchanged heat with outdoor air in the outdoor heat exchanger 13 becomes a high-pressure liquid refrigerant.
  • This refrigerant then passes through the second expansion valve 18 on the second flow path 52. Note that the second expansion valve 18 is fully open during cooling operation, and the pressure of the refrigerant does not change even when it passes through the second expansion valve 18.
  • the refrigerant that has passed through the second flow path 52 flows into the liquid-gas heat exchanger 30.
  • the high-temperature, high-pressure liquid refrigerant that has passed through the second flow path 52 exchanges heat with the low-temperature, low-pressure gas refrigerant described below.
  • the refrigerant that passes through the liquid-gas heat exchanger 30 and flows into the first flow path 51 drops in temperature and becomes in a state of increased subcooling.
  • the refrigerant in the subcooled state then passes through the first expansion valve 17.
  • the refrigerant expands and becomes a low-temperature, low-pressure liquid refrigerant.
  • the refrigerant that has flowed into the indoor heat exchanger 11 then exchanges heat with the indoor air, causing its temperature to rise and it to evaporate, becoming a low-pressure gas refrigerant.
  • the low-pressure gas refrigerant passes through the first four-way valve 20 and flows into the low-pressure gas flow path 54.
  • This low-pressure gas refrigerant then passes through the second four-way valve 40 and exchanges heat with the high-temperature, high-pressure liquid refrigerant described above in the liquid-gas heat exchanger 30. This causes the low-pressure gas refrigerant to become superheated.
  • the superheated low-pressure gas refrigerant passes through the second four-way valve 40 again, and then flows into the accumulator 16 and compressor 15. The above cycle occurs continuously, causing the air conditioner 1 to operate in cooling mode.
  • the gas refrigerant compressed by the compressor 15 to a high temperature and high pressure flows through the first four-way valve 20 to the indoor heat exchanger 11 on the first flow path 51.
  • the gas refrigerant becomes a high-pressure liquid refrigerant.
  • This refrigerant then passes through the first expansion valve 17 on the first flow path 51. Note that the first expansion valve 17 is fully open during heating operation, and there is no change in the pressure of the refrigerant even when it passes through the first expansion valve 17.
  • the refrigerant that has passed through the first flow path 51 then flows into the liquid-gas heat exchanger 30.
  • the high-temperature, high-pressure liquid refrigerant that has passed through the first flow path 51 exchanges heat with a low-temperature, low-pressure gas refrigerant, which will be described later.
  • the refrigerant that passes through the liquid-gas heat exchanger 30 and flows into the second flow path 52 has a lower temperature and a higher degree of subcooling.
  • the subcooled refrigerant then passes through the second expansion valve 18.
  • the refrigerant expands and becomes a low-temperature, low-pressure liquid refrigerant.
  • the refrigerant that has flowed into the outdoor heat exchanger 13 then exchanges heat with the outdoor air, causing its temperature to rise and it to evaporate, becoming a low-pressure gas refrigerant.
  • the low-pressure gas refrigerant passes through the first four-way valve 20 and flows into the low-pressure gas flow path 54.
  • This low-pressure gas refrigerant then passes through the second four-way valve 40 and exchanges heat with the high-temperature, high-pressure liquid refrigerant described above in the liquid-gas heat exchanger 30. This causes the low-pressure gas refrigerant to become superheated.
  • the superheated low-pressure gas refrigerant passes through the second four-way valve 40 again, and then flows into the accumulator 16 and compressor 15. The above cycle occurs continuously, causing the air conditioner 1 to operate in heating mode.
  • the refrigerant returning to the compressor 15 from the indoor heat exchanger 11 or the outdoor heat exchanger 13 as an evaporator is a gas refrigerant with the lowest possible temperature to prevent liquid compression in the compressor 15.
  • the liquid-gas heat exchanger 30 there is also a demand to suppress the generation of flash gas by supercooling the refrigerant in the refrigerant piping. Therefore, in the air conditioner 1 according to this embodiment, these two demands are met by the liquid-gas heat exchanger 30. Specifically, by using the liquid-gas heat exchanger 30, heat exchange can be performed between a high-temperature, high-pressure liquid refrigerant and a low-temperature, low-pressure gas refrigerant.
  • the refrigerant returning from the evaporator to the compressor 15 is further vaporized and becomes a gas refrigerant that does not contain liquid phase components. Therefore, the possibility of liquid compression occurring in the compressor 15 is reduced, and the compressor 15 can be operated more stably.
  • the refrigerant flowing through the first flow path 51 or the second flow path 52 is supercooled and becomes in an even lower temperature state. This makes it possible to suppress the generation of flash gas.
  • liquid refrigerant and gas refrigerant are provided in opposite directions in the liquid-gas heat exchanger 30.
  • the above-mentioned configurations are adopted.
  • the second four-way valve 40 is disposed in an area (on the low-pressure gas flow path 54) where only the low-pressure gaseous refrigerant flows.
  • the high-pressure refrigerant with a different temperature does not flow into the second four-way valve 40.
  • the second four-way valve 40 is disposed between the indoor heat exchanger 11 and the compressor 15. Therefore, for example, during cooling operation, only low-pressure refrigerant that has passed through the indoor heat exchanger 11 flows into the second four-way valve 40. This reduces the possibility of inadvertent heat exchange between low-temperature refrigerant and high-temperature refrigerant inside the second four-way valve 40. Therefore, the heat quantity of the refrigerant is stably maintained both before and after the second four-way valve 40, further improving the operating efficiency of the air conditioner 1.
  • the second four-way valve 40 is disposed between the first four-way valve 20 and the liquid-gas heat exchanger 30. Therefore, regardless of whether cooling operation or heating operation is being performed, only low-pressure refrigerant that has passed through the first four-way valve 20 flows into the second four-way valve 40. This reduces the possibility of inadvertent heat exchange between low-temperature refrigerant and high-temperature refrigerant inside the second four-way valve 40. As a result, the operating efficiency of the air conditioner 1 can be further improved.
  • a second embodiment of the present disclosure will be described with reference to Figs. 3 and 4.
  • the same reference numerals are used for the same configurations as those in the first embodiment, and detailed description will be omitted.
  • the position at which the accumulator 16 is provided is different from that in the first embodiment.
  • the accumulator 16 is provided between the first four-way valve 20 and the liquid-gas heat exchanger 30 on the low-pressure gas flow path 54.
  • the second four-way valve 40 and the liquid-gas heat exchanger 30 are disposed between the accumulator 16 and the compressor 15.
  • the liquid-gas heat exchanger 30 is provided downstream of the accumulator 16.
  • the compressor 15 is provided downstream of the liquid-gas heat exchanger 30.
  • the second four-way valve 40 is provided between the accumulator 16 and the liquid-gas compressor 15.
  • the low-pressure side refrigerant and the high-pressure side refrigerant in the liquid-gas heat exchanger 30 can be made to flow in countercurrent directions. This can further improve the heat exchange efficiency in the liquid-gas heat exchanger 30.
  • Figure 3 shows the refrigerant flow and the opening state of each valve during cooling operation
  • Figure 4 shows the refrigerant flow and the opening state of each valve during heating operation.
  • the refrigerant flow and the opening state of the valves are the same as in the first embodiment during either operation. Furthermore, the above-mentioned effects can be obtained in the same way during either operation.
  • the air conditioner 1 includes a refrigeration cycle 10 having an outdoor heat exchanger 13, an indoor heat exchanger 11, a compressor 15, and an expansion valve through which a refrigerant flows in sequence, a first four-way valve 20 that enables heating operation and cooling operation by switching the flow direction of the refrigerant, a liquid-gas heat exchanger 30 that exchanges heat between a gas refrigerant on the low pressure side of the refrigeration cycle 10 and a liquid refrigerant on the high pressure side, and a second four-way valve 40 that switches the flow of the refrigerant so that the gas refrigerant and the liquid refrigerant flow in countercurrent fashion in the liquid-gas heat exchanger 30 in both the heating operation and the cooling operation, and the second four-way valve 40 is disposed in an area through which the gaseous refrigerant on the low pressure side of the refrigeration cycle 10 flows.
  • the second four-way valve 40 is disposed in an area where low-pressure gaseous refrigerant flows. In other words, high-pressure refrigerant does not flow into the second four-way valve 40. This reduces the possibility of inadvertent heat exchange between low-temperature refrigerant and high-temperature refrigerant inside the second four-way valve 40. This further improves the operating efficiency of the air conditioner 1.
  • the air conditioner 1 according to the second aspect is the air conditioner 1 according to (1), in which the second four-way valve 40 is disposed between the indoor heat exchanger 11, which functions as an evaporator during the cooling operation, and the compressor 15.
  • the second four-way valve 40 is disposed between the indoor heat exchanger 11 and the compressor 15. Therefore, for example, during cooling operation, only low-pressure refrigerant that has passed through the indoor heat exchanger 11 flows into the second four-way valve 40. This reduces the possibility of inadvertent heat exchange between low-temperature refrigerant and high-temperature refrigerant inside the second four-way valve 40. This further improves the operating efficiency of the air conditioner 1.
  • the air conditioner 1 according to the third aspect is the air conditioner 1 according to (1) or (2), in which the second four-way valve 40 is disposed between the first four-way valve 20 and the liquid-gas heat exchanger 30.
  • the second four-way valve 40 is disposed between the first four-way valve 20 and the liquid-gas heat exchanger 30. Therefore, regardless of whether cooling operation or heating operation is being performed, only low-pressure refrigerant that has passed through the first four-way valve 20 flows into the second four-way valve 40. This reduces the possibility of inadvertent heat exchange between low-temperature refrigerant and high-temperature refrigerant inside the second four-way valve 40. This further improves the operating efficiency of the air conditioner 1.
  • the air conditioner 1 according to the fourth aspect is the air conditioner 1 according to any one of the aspects (1) to (3), in which the refrigeration cycle 10 is provided upstream of the compressor 15 and further includes an accumulator 16 that separates the refrigerant into gas and liquid, and the liquid-gas heat exchanger 30 and the second four-way valve 40 are disposed between the accumulator 16 and the compressor 15.
  • the liquid-gas heat exchanger 30 is disposed downstream of the accumulator 16, the refrigerant flowing into the accumulator 16 is not superheated. This makes it possible to maintain low fluidity of the lubricating oil that is mixed with the refrigerant in the accumulator 16. This makes it possible to smoothly guide the lubricating oil to each part of the compressor 15.
  • the compressor 15 is disposed downstream of the liquid-gas heat exchanger 30, superheated refrigerant flows into the compressor 15. This causes the liquid phase components of the refrigerant to vaporize, reducing the possibility of liquid compression occurring in the compressor 15.
  • the air conditioner 1 includes a refrigeration cycle 10 having an outdoor heat exchanger 13, an indoor heat exchanger 11, a compressor 15, and an expansion valve through which a refrigerant flows in sequence, a first four-way valve 20 that enables heating operation and cooling operation by switching the flow direction of the refrigerant, a liquid-gas heat exchanger 30 that exchanges heat between a gas refrigerant on the low pressure side of the refrigeration cycle 10 and a liquid refrigerant on the high pressure side, a second four-way valve 40 that switches the flow of the refrigerant so that the gas refrigerant and the liquid refrigerant flow in countercurrent flow in the liquid-gas heat exchanger 30 in both the heating operation and the cooling operation, and an accumulator 16 that is provided upstream of the compressor 15 and separates the refrigerant into gas and liquid, and the liquid-gas heat exchanger 30 is disposed between the accumulator 16 and the compressor 15.
  • the liquid-gas heat exchanger 30 is disposed downstream of the accumulator 16, the refrigerant flowing into the accumulator 16 is not superheated. This makes it possible to maintain low fluidity of the lubricating oil that is mixed with the refrigerant in the accumulator 16. This makes it possible to smoothly guide the lubricating oil to each part of the compressor 15.
  • the compressor 15 is disposed downstream of the liquid-gas heat exchanger 30, superheated refrigerant flows into the compressor 15. This causes the liquid phase components of the refrigerant to vaporize, reducing the possibility of liquid compression occurring in the compressor 15.
  • the air conditioner 1 according to the sixth aspect is the air conditioner 1 according to (5), in which the second four-way valve 40 is provided between the accumulator 16 and the liquid-gas heat exchanger 30.
  • the second four-way valve 40 is provided between the accumulator 16 and the liquid-gas compressor 15, the low-pressure side refrigerant and the high-pressure side refrigerant in the liquid-gas heat exchanger 30 can flow in countercurrent directions. This can further improve the heat exchange efficiency in the liquid-gas heat exchanger 30.
  • This disclosure makes it possible to provide an air conditioner with improved operating efficiency.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Air-Conditioning Room Units, And Self-Contained Units In General (AREA)

Abstract

L'invention concerne un climatiseur qui comprend : un cycle de réfrigération ayant un échangeur de chaleur extérieur, un échangeur de chaleur intérieur, un compresseur et un détendeur à travers chacun desquels circule un fluide frigorigène de manière séquentielle ; une première soupape à quatre voies qui permet de commuter entre une opération de chauffage et une opération de refroidissement par commutation de la direction de circulation du fluide frigorigène ; un échangeur de chaleur à gaz liquide qui échange de la chaleur entre le fluide frigorigène dans un état gazeux sur le côté basse pression du cycle de réfrigération et le fluide frigorigène dans un état liquide sur le côté haute pression ; et une seconde soupape à quatre voies qui commute l'écoulement du fluide frigorigène de telle sorte que le fluide frigorigène à l'état gazeux et le fluide frigorigène à l'état liquide prennent des écoulements opposés dans l'échangeur de chaleur à gaz liquide à la fois dans l'opération de chauffage et l'opération de refroidissement, la seconde soupape à quatre voies étant disposée dans une région dans le cycle de réfrigération où le fluide frigorigène à l'état gazeux sur le côté basse pression circule.
PCT/JP2023/034206 2022-09-27 2023-09-21 Climatiseur Ceased WO2024070872A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP23872099.9A EP4589215A1 (fr) 2022-09-27 2023-09-21 Climatiseur
AU2023353614A AU2023353614A1 (en) 2022-09-27 2023-09-21 Air conditioner

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-153649 2022-09-27
JP2022153649A JP2024047891A (ja) 2022-09-27 2022-09-27 空気調和機

Publications (1)

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WO2024070872A1 true WO2024070872A1 (fr) 2024-04-04

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PCT/JP2023/034206 Ceased WO2024070872A1 (fr) 2022-09-27 2023-09-21 Climatiseur

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EP (1) EP4589215A1 (fr)
JP (1) JP2024047891A (fr)
AU (1) AU2023353614A1 (fr)
WO (1) WO2024070872A1 (fr)

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JP2003194432A (ja) 2001-10-19 2003-07-09 Matsushita Electric Ind Co Ltd 冷凍サイクル装置
US20120036854A1 (en) * 2009-04-29 2012-02-16 Carrier Corporation Transcritical thermally activated cooling, heating and refrigerating system
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