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WO2021106084A1 - Dispositif à cycle de réfrigération - Google Patents

Dispositif à cycle de réfrigération Download PDF

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Publication number
WO2021106084A1
WO2021106084A1 PCT/JP2019/046224 JP2019046224W WO2021106084A1 WO 2021106084 A1 WO2021106084 A1 WO 2021106084A1 JP 2019046224 W JP2019046224 W JP 2019046224W WO 2021106084 A1 WO2021106084 A1 WO 2021106084A1
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WO
WIPO (PCT)
Prior art keywords
source side
side refrigerant
low
heat exchanger
heat medium
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/JP2019/046224
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English (en)
Japanese (ja)
Inventor
正紘 伊藤
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 Electric Corp
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Mitsubishi Electric Corp
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 Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2019/046224 priority Critical patent/WO2021106084A1/fr
Priority to JP2021560808A priority patent/JP7146117B2/ja
Publication of WO2021106084A1 publication Critical patent/WO2021106084A1/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
    • F25B1/00—Compression machines, plants or systems with non-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
    • 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
    • F25B29/00—Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • 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
    • F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit

Definitions

  • the present invention relates to a refrigeration cycle device.
  • Patent Document 1 describes a dual refrigeration cycle device.
  • the enthalpy difference increases by increasing the subcooling (supercooling degree) in the cascade heat exchanger, so that the capacity can be increased.
  • the dual refrigeration cycle device described in the above publication functions only as a refrigerator. Therefore, it is impossible to increase the capacity in both cold and warm.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a refrigeration cycle apparatus capable of increasing the capacity in both cooling and heating.
  • the refrigeration cycle apparatus of the present invention includes a high-source side refrigerant circuit, a low-source side refrigerant circuit, and a heat medium circuit.
  • the high-source side refrigerant circuit has a high-source side compressor, a hexagonal valve, a high-source side refrigerant heat exchanger, a high-source side expansion valve, a cascade heat exchanger, and a first heat medium heat exchanger, and has a high-source side refrigerant.
  • the low-source side refrigerant circuit includes a low-source side compressor, a four-way valve, a cascade heat exchanger, a low-source side expansion valve, and a second heat medium heat exchanger, and circulates the low-source side refrigerant.
  • the heat medium circuit distributes the heat medium through the first heat medium heat exchanger and the second heat medium heat exchanger.
  • the high-source side refrigerant circuit should flow in the order of high-source side compressor, hexagonal valve, high-source side refrigerant heat exchanger, high-source side expansion valve, cascade heat exchanger, and hexagonal valve.
  • the six-way valve is switched, and the low-source side refrigerant flows through the low-source side refrigerant circuit in the order of the low-source side compressor, four-way valve, cascade heat exchanger, low-source side expansion valve, second heat medium heat exchanger, and four-way valve.
  • the four-way valve is switched, and heat exchange is performed between the heat medium circulating in the heat medium circuit and the low source side refrigerant circulating in the low source side refrigerant circuit in the second heat medium heat exchanger.
  • the high-source side refrigerant circuit is changed to the high-source side compressor, hexagonal valve, first heat medium heat exchanger, hexagonal valve, cascade heat exchanger, high-source side expansion valve, high-source side refrigerant heat exchanger, six-way.
  • the six-way valve is switched so that the high-source side refrigerant flows in the order of the valves, and the low-source side refrigerant circuit is changed to the low-source side compressor, four-way valve, second heat medium heat exchanger, low-source side expansion valve, and cascade heat exchanger.
  • the four-way valve is switched so that the low-source side refrigerant flows in this order, and the heat medium that circulates in the heat medium circuit and the low-source side refrigerant that circulates in the low-source side refrigerant circuit in the second heat medium heat exchanger. Heat exchange is performed between them, and heat is exchanged between the heat medium circulating in the heat medium circuit and the high source side refrigerant circulating in the high source side refrigerant circuit in the first heat medium heat exchanger.
  • heat is exchanged between the high-source side refrigerant and the low-source side refrigerant in the cascade heat exchanger during the cooling operation.
  • heat exchange is performed between the high-source side refrigerant and the low-source side refrigerant in the cascade heat exchanger, and heat exchange is performed between the high-source side refrigerant and the heat medium in the first heat medium heat exchanger. Will be done. Therefore, it is possible to increase the capacity for both cooling and heating.
  • the configuration of the refrigeration cycle apparatus 1 according to the embodiment will be described with reference to FIG.
  • the refrigeration cycle device 1 includes a high-source side refrigerant circuit 10, a low-source side refrigerant circuit 20, a heat medium circuit 30, and a control device 40.
  • the high-source side refrigerant circuit 10 includes a high-source side compressor 11, a hexagonal valve 12, a high-source side refrigerant heat exchanger 13, a high-source side expansion valve 14, a cascade heat exchanger 15, and a first heat medium heat exchanger 16. Have.
  • the high-source side compressor 11, the hexagonal valve 12, the high-source side refrigerant heat exchanger 13, the high-source side expansion valve 14, the cascade heat exchanger 15, and the first heat medium heat exchanger 16 are connected by piping.
  • the high-source side refrigerant circuit 10 is configured to circulate the high-source side refrigerant.
  • the high-source side compressor 11 is configured to compress the high-source side refrigerant.
  • the high-source side compressor 11 has a suction port and a discharge port.
  • the high-source side compressor 11 is configured to compress the high-source side refrigerant sucked from the suction port and discharge it from the discharge port.
  • the high source side compressor 11 is configured to have a variable capacity.
  • the high-source side compressor 11 may be configured to change its capacity by adjusting the rotation speed of the high-source side compressor 11 based on an instruction from the control device 40.
  • the hexagonal valve 12 is connected to the high-source side compressor 11, the high-source side refrigerant heat exchanger 13, the cascade heat exchanger 15, and the first heat medium heat exchanger 16.
  • the hexagonal valve 12 transfers the high-source side refrigerant compressed by the high-source side compressor 11 to either the high-source side refrigerant heat exchanger 13 or the cascade heat exchanger 15 via the first heat medium heat exchanger 16. It is configured to be switchable so that it flows.
  • the hexagonal valve 12 causes the high-source side refrigerant discharged from the high-source side compressor 11 to flow to the high-source side refrigerant heat exchanger 13 during the cooling operation, and discharges the high-source side refrigerant from the high-source side compressor 11 during the heating operation. It is configured to switch the flow of the high-source side refrigerant so that the high-source side refrigerant flows to the cascade heat exchanger 15 via the first heat medium heat exchanger 16.
  • the six-way valve 12 uses the high-source side refrigerant circuit 10 in the high-source side compressor 11, the hexagonal valve 12, the high-source side refrigerant heat exchanger 13, the high-source side expansion valve 14, the cascade heat exchanger 15, and the six-way valve during cooling operation. It is configured to be switchable so that the high-source side refrigerant flows in the order of the valves 12.
  • the six-way valve 12 uses the high-source side refrigerant circuit 10 with the high-source side compressor 11, the hexagonal valve 12, the first heat medium heat exchanger 16, the hexagonal valve 12, the cascade heat exchanger 15, and the high-source side expansion.
  • the valve 14, the high-source side refrigerant heat exchanger 13, and the hexagonal valve 12 are configured to be switchable so that the high-source side refrigerant flows in this order.
  • the high-source side refrigerant heat exchanger 13 is configured to exchange heat between the high-source side refrigerant flowing in the high-source side refrigerant heat exchanger 13 and the air around the high-source side refrigerant heat exchanger 13. ing.
  • the high-source side refrigerant heat exchanger 13 is connected to the high-side valve 12 and the high-source side expansion valve 14.
  • the high-source side refrigerant heat exchanger 13 functions as a condenser that condenses the high-source side refrigerant during the cooling operation, and functions as an evaporator that evaporates the high-source side refrigerant during the heating operation.
  • the high-source side refrigerant heat exchanger 13 is, for example, a plate fin tube type heat exchanger having a plurality of fins and a pipe penetrating the plurality of fins.
  • the high-source side expansion valve 14 is configured to reduce the pressure by expanding the high-source side refrigerant condensed by the condenser.
  • the high-source side expansion valve 14 is connected to the high-source side refrigerant heat exchanger 13 and the cascade heat exchanger 15.
  • the high-source side expansion valve 14 serves as a throttle device for reducing the pressure of the high-source side refrigerant condensed by the high-source side refrigerant heat exchanger 13 during cooling operation, and the high-source side refrigerant condensed by the cascade heat exchanger 15 during heating operation. It becomes a squeezing device that depressurizes.
  • the high-source side expansion valve 14 is, for example, a solenoid valve or a capillary tube.
  • the cascade heat exchanger 15 is configured to exchange heat between the high-source side refrigerant that circulates in the high-source side refrigerant circuit 10 and the low-source side refrigerant that circulates in the low-source side refrigerant circuit 20.
  • the cascade heat exchanger 15 is connected to the high-source side expansion valve 14 and the hexagonal valve 12. Further, the cascade heat exchanger 15 is connected to the low source side refrigerant heat exchanger 23 and the low source side expansion valve 24.
  • the cascade heat exchanger 15 functions as an evaporator that evaporates the high-source side refrigerant during the cooling operation, and functions as a condenser that condenses the high-source side refrigerant during the heating operation.
  • the first heat medium heat exchanger 16 is configured to exchange heat between the high source side refrigerant circulating in the high source side refrigerant circuit 10 and the heat medium circulating in the heat medium circuit 30.
  • the first heat medium heat exchanger 16 is connected to the hexagonal valve 12.
  • the first heat medium heat exchanger 16 is configured such that the high-source side refrigerant does not circulate during the cooling operation and the high-source side refrigerant circulates during the heating operation.
  • the first heat medium heat exchanger 16 is configured so that heat exchange is not performed between the heat medium circulating in the heat medium circuit 30 and the high source side refrigerant circulating in the high source side refrigerant circuit 10 during the cooling operation. Has been done.
  • the first heat medium heat exchanger 16 is configured to exchange heat between the heat medium circulating in the heat medium circuit 30 and the high source side refrigerant circulating in the high source side refrigerant circuit 10 during the heating operation. ing.
  • the low-source side refrigerant circuit 20 includes a low-source side compressor 21, a four-way valve 22, a low-source side refrigerant heat exchanger 23, a cascade heat exchanger 15, a low-source side expansion valve 24, and a second heat medium heat exchanger 25.
  • the low source side compressor 21, the four-way valve 22, the low source side refrigerant heat exchanger 23, the cascade heat exchanger 15, the low source side expansion valve 24, and the second heat medium heat exchanger 25 are connected by piping.
  • the low-source side refrigerant circuit 20 is configured to circulate the low-source side refrigerant.
  • the low source side compressor 21 is configured to compress the low source side refrigerant.
  • the low source side compressor 21 has a suction port and a discharge port.
  • the low source side compressor 21 is configured to compress the low source side refrigerant sucked from the suction port and discharge it from the discharge port.
  • the low source side compressor 21 is configured to have a variable capacity.
  • the low-source side compressor 21 may be configured to change its capacity by adjusting the rotation speed of the low-source side compressor 21 based on an instruction from the control device 40.
  • the four-way valve 22 is connected to the low-source side compressor 21, the low-source side refrigerant heat exchanger 23, and the second heat medium heat exchanger 25.
  • the four-way valve 22 is configured to be switchable so that the low-source side refrigerant compressed by the low-source side compressor 21 flows to either the low-source side refrigerant heat exchanger 23 or the second heat medium heat exchanger 25.
  • the four-way valve 22 causes the low-source side refrigerant discharged from the low-source side compressor 21 to flow to the low-source side refrigerant heat exchanger 23 during the cooling operation, and discharges the low-source side refrigerant from the low-source side compressor 21 during the heating operation. It is configured to switch the flow of the low-source side refrigerant so that the low-source side refrigerant flows through the second heat medium heat exchanger 25.
  • the four-way valve 22 uses the low-source side refrigerant circuit 20 as the low-source side compressor 21, the four-way valve 22, the cascade heat exchanger 15, the low-source side expansion valve 24, the second heat medium heat exchanger 25, and the four-way valve. It is configured to be switchable so that the low-source side refrigerant flows in the order of the valves 22.
  • the four-way valve 22 uses the low-source side refrigerant circuit 20 as the low-source side compressor 21, the four-way valve 22, the second heat medium heat exchanger 25, the low-source side expansion valve 24, the cascade heat exchanger 15, and the four-way valve. It is configured to be switchable so that the low-source side refrigerant flows in the order of the valves 22.
  • the low-source side refrigerant heat exchanger 23 is configured to exchange heat between the low-source side refrigerant flowing in the low-source side refrigerant heat exchanger 23 and the air around the low-source side refrigerant heat exchanger 23. ing.
  • the low source side refrigerant heat exchanger 23 is an auxiliary heat exchanger.
  • the low-source side refrigerant heat exchanger 23 is connected to the four-way valve 22 and the cascade heat exchanger 15.
  • the low-source side refrigerant heat exchanger 23 functions as a condenser that condenses the low-source side refrigerant during the cooling operation, and functions as an evaporator that evaporates the low-source side refrigerant during the heating operation.
  • the low-source side refrigerant heat exchanger 23 is, for example, a plate fin tube type heat exchanger having a plurality of fins and a pipe penetrating the plurality of fins.
  • the low source side expansion valve 24 is configured to reduce the pressure by expanding the low source side refrigerant condensed by the condenser.
  • the lower expansion valve 24 is connected to the cascade heat exchanger 15 and the second heat medium heat exchanger 25.
  • the low source side expansion valve 24 serves as a throttle device for reducing the pressure of the low source side refrigerant condensed by the low source side refrigerant heat exchanger 23 and the cascade heat exchanger 15 during cooling operation, and is a second heat medium heat exchanger during heating operation. It is a drawing device that reduces the pressure of the low-source side refrigerant condensed by 25.
  • the lower expansion valve 24 is, for example, a solenoid valve or a caliber tube.
  • the second heat medium heat exchanger 25 is configured to exchange heat between the low source side refrigerant circulating in the low source side refrigerant circuit 20 and the heat medium circulating in the heat medium circuit 30.
  • the second heat medium heat exchanger 25 is connected to the low source side expansion valve 24 and the four-way valve 22.
  • the second heat medium heat exchanger 25 functions as an evaporator that evaporates the low-source side refrigerant during the cooling operation, and functions as a condenser that condenses the low-source side refrigerant during the heating operation.
  • the second heat medium heat exchanger 25 is configured to exchange heat between the heat medium circulating in the heat medium circuit 30 and the low source side refrigerant circulating in the low source side refrigerant circuit 20 during the cooling operation. ing.
  • the second heat medium heat exchanger 25 is configured to exchange heat between the heat medium circulating in the heat medium circuit 30 and the low source side refrigerant circulating in the low source side refrigerant circuit 20 during the heating operation. ing.
  • the heat medium circuit 30 is configured to circulate the heat medium through the first heat medium heat exchanger 16 and the second heat medium heat exchanger 25.
  • the first heat medium heat exchanger 16 and the second heat medium heat exchanger 25 are connected by a pipe.
  • the heat medium is, for example, water or antifreeze.
  • the heat medium circuit 30 is connected to, for example, a radiator, and is configured to supply the heat medium to the radiator. This radiator is, for example, a showcase.
  • the high-source side refrigerant is, for example, a flammable refrigerant
  • the low-source side refrigerant is, for example, a non-flammable refrigerant.
  • the high-source side refrigerant is, for example, propane
  • the low-source side refrigerant is, for example, carbon dioxide (CO 2 ).
  • the high-source side refrigerant is, for example, R32
  • the low-source side refrigerant is, for example, carbon dioxide (CO 2 ).
  • the control device 40 is configured to perform calculations, instructions, and the like to control each means, device, and the like of the refrigeration cycle device.
  • the cooling operation is an operation in which the high-source side refrigerant circuit 10, the low-source side refrigerant circuit 20, and the heat medium circuit 30 are operated, and the space around the radiator (not shown) is cooled by the heat medium flowing through the heat medium circuit 30. ..
  • the high-source side refrigerant circuit 10 during the cooling operation, the high-source side refrigerant circuit 10 is replaced with the high-source side compressor 11, the hexagonal valve 12, the high-source side refrigerant heat exchanger 13, the high-source side expansion valve 14, and the cascade heat exchange.
  • the hexagonal valve 12 is switched so that the high-source side refrigerant flows in the order of the vessel 15 and the hexagonal valve 12.
  • the high source side compressor 11 compresses the high source side refrigerant.
  • the high-source side refrigerant is in a high-temperature and high-pressure gas state.
  • the high-temperature and high-pressure gas state of the high-source side refrigerant is discharged from the high-source side compressor 11 and condensed by dissipating heat to the air in the high-source side refrigerant heat exchanger 13 via the hexagonal valve 12. , High pressure liquid state.
  • the high-pressure liquid state refrigerant flows to the high-source side expansion valve 14 and expands at the high-source side expansion valve 14 to reduce the pressure, resulting in a low-temperature low-pressure gas-liquid two-phase state.
  • This low-temperature low-pressure gas-liquid two-phase high-source side refrigerant flows into the cascade heat exchanger 15 and evaporates due to heat exchange with the low-source side refrigerant circulating in the low-source side refrigerant circuit 20. , It becomes a low pressure gas state.
  • the high-source side refrigerant in the low-pressure gas state returns to the high-source side compressor 11 via the hexagonal valve 12 and is compressed by the high-source side compressor 11. In this way, the high-source side refrigerant circulates in the high-source side refrigerant circuit during the cooling operation.
  • the low-source side refrigerant circuit 20 is divided into the low-source side compressor 21, the four-way valve 22, the cascade heat exchanger 15, the low-source side expansion valve 24, the second heat medium heat exchanger 25, and the four-way valve.
  • the four-way valve 22 is switched so that the low-source side refrigerant flows in the order of the valve 22.
  • the low source side compressor 21 compresses the low source side refrigerant.
  • the low-source side refrigerant is in a high-temperature and high-pressure gas state.
  • the low-source side refrigerant in this high-temperature and high-pressure gas state is discharged from the high-source side compressor 11 and condenses by dissipating heat to the air in the low-source side refrigerant heat exchanger 23 via the four-way valve 22. ..
  • the low-source side refrigerant condensed in the low-source side refrigerant heat exchanger 23 flows to the cascade heat exchanger 15, and heat exchange is performed with the high-source side refrigerant circulating in the high-source side refrigerant circuit 10.
  • the high-pressure liquid state low-source side refrigerant flows to the low-source side expansion valve 24 and expands at the low-source side expansion valve 24 to reduce the pressure, resulting in a low-temperature low-pressure gas-liquid two-phase state.
  • This low-temperature, low-pressure, gas-liquid two-phase low-source side refrigerant flows into the second heat medium heat exchanger 25 and evaporates due to heat exchange with the heat medium flowing through the heat medium circuit 30. It becomes a low pressure gas state.
  • the low-pressure gas state low-source side refrigerant returns to the low-source side compressor 21 via the four-way valve 22 and is compressed by the low-source side compressor 21. In this way, the low-source side refrigerant circulates in the low-source side refrigerant circuit during the cooling operation.
  • the heat medium circulates in the first heat medium heat exchanger 16 and the second heat medium heat exchanger 25.
  • heat exchange is performed between the heat medium circulating in the heat medium circuit 30 and the low source side refrigerant circulating in the low source side refrigerant circuit 20.
  • the heat medium is generated by heat exchange between the low source side refrigerant circulating in the low source side refrigerant circuit 20 and the heat medium flowing through the heat medium circuit 30 in the second heat medium heat exchanger 25. It is cooled.
  • the heating operation is an operation in which the high-source side refrigerant circuit 10, the low-source side refrigerant circuit 20, and the heat medium circuit 30 are operated, and the space around the radiator (not shown) is warmed by the heat medium flowing through the heat medium circuit 30. ..
  • the high-source side refrigerant circuit 10 during the heating operation, the high-source side refrigerant circuit 10 is used with the high-source side compressor 11, the hexagonal valve 12, the first heat medium heat exchanger 16, the hexagonal valve 12, and the cascade heat exchanger 15.
  • the hexagonal valve 12 is switched so that the high source side refrigerant flows in the order of the high source side expansion valve 14, the high source side refrigerant heat exchanger 13, and the hexagonal valve 12.
  • the high source side compressor 11 compresses the high source side refrigerant.
  • the high-source side refrigerant is in a high-temperature and high-pressure gas state.
  • the high-temperature and high-pressure gas state of the high-source side refrigerant is discharged from the high-source side compressor 11, flows to the first heat medium heat exchanger 16 via the hexagonal valve 12, and flows through the heat medium circuit 30. It condenses due to heat exchange with.
  • the high-source side refrigerant condensed in the first heat medium heat exchanger 16 flows to the cascade heat exchanger 15 via the hexagonal valve 12 and with the low-source side refrigerant circulating in the low-source side refrigerant circuit 20.
  • the high-pressure liquid state refrigerant flows to the high-source side expansion valve 14 and expands at the high-source side expansion valve 14 to reduce the pressure, resulting in a low-temperature low-pressure gas-liquid two-phase state.
  • This low-temperature low-pressure gas-liquid two-phase high-source side refrigerant evaporates due to heat exchange with air in the high-source side refrigerant heat exchanger 13, and becomes a low-pressure gas state.
  • the high-source side refrigerant in the low-pressure gas state returns to the high-source side compressor 11 via the hexagonal valve 12 and is compressed by the high-source side compressor 11. In this way, the high-source side refrigerant circulates in the high-source side refrigerant circuit during the heating operation.
  • the low-source side refrigerant circuit 20 is divided into the low-source side compressor 21, the four-way valve 22, the second heat medium heat exchanger 25, the low-source side expansion valve 24, the cascade heat exchanger 15, and the four-way valve.
  • the four-way valve 22 is switched so that the low-source side refrigerant flows in the order of the valve 22.
  • the low source side compressor 21 compresses the low source side refrigerant.
  • the low-source side refrigerant is in a high-temperature and high-pressure gas state.
  • the low-source side refrigerant in the high-temperature and high-pressure gas state is discharged from the low-source side compressor 21, flows to the second heat medium heat exchanger 25 via the four-way valve 22, and flows through the heat medium circuit 30.
  • the low-source side cold refrigerant in this high-pressure liquid state flows to the low-source side expansion valve 24 and is manually expanded to the low-source side expansion valve 24 to reduce the pressure, resulting in a low-temperature low-pressure gas-liquid two-phase state.
  • This low-temperature, low-pressure, gas-liquid two-phase state high-source side refrigerant flows into the cascade heat exchanger 15 and evaporates due to heat exchange with the high-source side refrigerant circulating in the high-source side refrigerant circuit 10. ..
  • the low-source side refrigerant evaporated in the cascade heat exchanger 15 evaporates by heat exchange with air in the low-source side refrigerant heat exchanger 23, and becomes a low-pressure gas state.
  • the low-pressure gas state low-source side refrigerant returns to the low-source side compressor 21 via the four-way valve 22 and is compressed by the low-source side compressor 21. In this way, the low-source side refrigerant circulates in the low-source side refrigerant circuit during the heating operation.
  • the heat medium circulates in the first heat medium heat exchanger 16 and the second heat medium heat exchanger 25.
  • heat exchange is performed between the heat medium circulating in the heat medium circuit 30 and the low source side refrigerant circulating in the low source side refrigerant circuit 20.
  • heat exchange is performed between the heat medium circulating in the heat medium circuit 30 and the high source side refrigerant circulating in the high source side refrigerant circuit 10.
  • heat exchange is performed between the high-source side refrigerant circulating in the high-source side refrigerant circuit 10 and the heat medium circulating in the heat medium circuit 30 in the first heat medium heat exchanger 16, and further, the first heat medium heat exchanger 16 performs heat exchange.
  • the heat medium is heated by heat exchange between the low-source side refrigerant circulating in the low-source side refrigerant circuit 20 and the heat medium flowing through the heat medium circuit 30 in the heat medium heat exchanger 25.
  • the hexagonal valve 12 has a first connection port P1, a second connection port P2, a third connection port P3, a fourth connection port P4, a fifth connection port P5, and a sixth connection port.
  • the first connection port P1 is connected to the discharge port of the high-source side compressor 11.
  • the second connection port P2 is connected to the suction port of the high-source side compressor 11.
  • the third connection port P3 is connected to the high-source side refrigerant heat exchanger 13.
  • the fourth connection port P4 is connected to the cascade heat exchanger 15.
  • the fifth connection port P5 is connected to the refrigerant inlet of the first heat medium heat exchanger 16.
  • the sixth connection port P6 is connected to the refrigerant outlet of the first heat medium heat exchanger 16.
  • connection port P1 and the third connection port P3 are connected to the high pressure side of the high-source side refrigerant circuit 10.
  • the second connection port P2, the fourth connection port P4, the fifth connection port P5, and the sixth connection port P6 are connected to the low voltage side of the high-source side refrigerant circuit 10.
  • the first connection port P1, the fourth connection port P4, the fifth connection port P5, and the sixth connection port P6 are connected to the high source side of the high source side refrigerant circuit 10.
  • the second connection port P2 and the third connection port P3 are connected to the low source side of the high source side refrigerant circuit 10.
  • the first connection port P1 is always connected to the high pressure side of the high source side refrigerant circuit during the cooling operation and the heating operation.
  • the second connection port P2 is always connected to the low pressure side of the high source side refrigerant circuit during the cooling operation and the heating operation.
  • An example of the hexagonal valve 12 is a sliding switching valve.
  • the hexagonal valve 12 has a valve body 12a and a valve body 12b.
  • the valve body 12a is a hollow frame body.
  • the valve body 12b is configured to be able to switch the flow path in the hexagonal valve 12 by sliding in the valve body 12a according to the difference in high and low pressure.
  • the hexagonal valve 12 has two flow paths provided in the valve body 12b and one flow path between the connection port and the first connection port which are not connected to the two flow paths.
  • the first connection port P1 and the third connection port P3 are connected, the second connection port P2 and the fourth connection port P4 are connected, and the fifth connection port P5 and The sixth connection port P6 is connected.
  • the first connection port P1 and the fifth connection port P5 are connected, the fourth connection port P4 and the sixth connection port P6 are connected, and the second connection port P2 and The third connection port P3 is connected.
  • the first connection port P1 is always connected to the high pressure side of the high source side refrigerant circuit, and the second connection port P2 is always connected to the low pressure side of the high source side refrigerant circuit. It is possible to secure a stable pressure difference.
  • the low-source side refrigerant flowing through the second heat medium heat exchanger 25 flows from the bottom to the top during the cooling operation, and flows from the top to the bottom during the heating operation. Therefore, during the cooling operation, the low-source side refrigerant in the gas state flows from the bottom to the top, and during the heating operation, the low-source side refrigerant in the liquid state flows from the top to the bottom.
  • the heat medium flowing through the second heat medium heat exchanger 25 flows from the bottom to the top during the cooling operation and the heating operation.
  • the low-source side refrigerant and heat medium flowing through the second heat medium heat exchanger 25 flow in parallel during the cooling operation in which the second heat medium heat exchanger 25 functions as an evaporator, and the second heat medium heat exchanger 25 flows. It flows in opposition during heating operation, which functions as a condenser.
  • the refrigeration cycle device 1 heat exchange is performed between the high-source side refrigerant and the low-source side refrigerant in the cascade heat exchanger 15 during the cooling operation. Therefore, by increasing the subcooling (supercooling degree), the enthalpy difference increases, so that the capacity can be increased.
  • heat exchange is performed between the high-source side refrigerant and the low-source side refrigerant in the cascade heat exchanger 15. Therefore, in the cascade heat exchanger 15, the evaporation temperature of the low-source side refrigerant increases, so that the capacity can be increased.
  • the heat exchange efficiency is such that the heat exchange is performed directly between the high source side refrigerant and the heat medium as compared with the case where the heat exchange is performed between the high source side refrigerant and the heat medium via the cascade heat exchanger 15. Better if done. Therefore, it is possible to increase the capacity. Therefore, it is possible to increase the capacity for both cooling and heating.
  • the hexagonal valve 12 makes it possible to simplify the high-source side refrigerant circuit 10. As a result, the equipment constituting the high-source side refrigerant circuit 10 can be reduced. Further, the cost of the high-source side refrigerant circuit 10 can be reduced.
  • the high-source side refrigerant is a flammable refrigerant
  • the low-source side refrigerant is a non-flammable refrigerant. Since the high-source side refrigerant does not flow to the first heat medium heat exchanger 16 during the cooling operation, the first heat medium heat exchanger 16 is not destroyed by freezing of the heat medium. Therefore, the flammable refrigerant does not flow out into the room because the first heat medium heat exchanger 16 is destroyed. Therefore, safety can be ensured even if the high-source side refrigerant is a flammable refrigerant.
  • the high-source side refrigerant is a flammable refrigerant such as propane and the low-source side refrigerant is carbon dioxide (CO 2 ), for example, it becomes possible to comply with the refrigerant regulation that regulates the use of chlorofluorocarbons. ..
  • the first connection port P1 is always connected to the high pressure side of the high-source side refrigerant circuit during the cooling operation and the heating operation, and is connected to the second connection port.
  • P2 is always connected to the low pressure side of the high source side refrigerant circuit during the cooling operation and the heating operation. Therefore, when the flow path in the hexagonal valve 12 is switched according to the high / low pressure difference, the high / low pressure difference can be stably secured.
  • the low-source side refrigerant flowing through the second heat medium heat exchanger 25 flows from the bottom to the top during the cooling operation and from the top to the bottom during the heating operation. .. Therefore, during the cooling operation, the low-source side refrigerant in the gas state flows from the bottom to the top, and during the heating operation, the low-source side refrigerant in the liquid state flows from the top to the bottom. If the low-source side refrigerant in the gas state flows from top to bottom during the cooling operation, the resistance when the low-source side refrigerant flows increases, so that the heat transfer efficiency decreases. On the other hand, in the refrigeration cycle device 1 according to the embodiment, since the low-source side refrigerant in the gas state flows from the bottom to the top during the cooling operation, it is possible to suppress a decrease in heat transfer efficiency.
  • 1 Refrigerant cycle device 10 High-source side refrigerant circuit, 11 High-source side compressor, 12 Hexagonal valve, 13 High-source side refrigerant heat exchanger, 14 High-source side expansion valve, 15 Cascade heat exchanger, 16 1st heat medium Heat exchanger, 20 low-source side refrigerant circuit, 21 low-source side compressor, 22 four-way valve, 23 low-source side refrigerant heat exchanger, 24 low-source side expansion valve, 25 second heat medium heat exchanger, 30 heat medium Circuit, 40 control device, P1 1st connection port, P2 2nd connection port, P3 3rd connection port, P4 4th connection port, P5 5th connection port, P6 6th connection port.

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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)

Abstract

L'objectif de la présente invention est de fournir un dispositif à cycle de réfrigération qui peut obtenir une capacité de refroidissement supérieure et une capacité de chauffage supérieure. Un dispositif à cycle de réfrigération (1) est équipé d'un circuit de fluide frigorigène côté ordre élevé (10), d'un circuit de fluide frigorigène côté ordre inférieur (20) et d'un circuit de milieu caloporteur (30). Le circuit de fluide frigorigène côté ordre élevé (10) comprend un compresseur côté ordre élevé (11), une vanne à six voies (12), un échangeur de chaleur à fluide frigorigène côté ordre élevé (13), une soupape d'expansion côté ordre élevé (14), un échangeur de chaleur en cascade (15) et un premier échangeur de chaleur à milieu caloporteur (16), et fait circuler un fluide frigorigène côté ordre élevé. Le circuit de fluide frigorigène côté ordre inférieur (20) comporte un compresseur côté ordre inférieur (21), une vanne à quatre voies (22), l'échangeur de chaleur en cascade (15), une soupape d'expansion côté ordre inférieur (24) et un second échangeur de chaleur à milieu caloporteur (25), et fait circuler un fluide frigorigène côté ordre inférieur. Le circuit de milieu caloporteur (30) distribue un milieu caloporteur au premier échangeur de chaleur à milieu caloporteur (16) et au second échangeur de chaleur à milieu caloporteur (25).
PCT/JP2019/046224 2019-11-26 2019-11-26 Dispositif à cycle de réfrigération Ceased WO2021106084A1 (fr)

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JP2021560808A JP7146117B2 (ja) 2019-11-26 2019-11-26 冷凍サイクル装置

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Cited By (1)

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EP4553413A4 (fr) 2023-09-29 2025-08-06 Daikin Ind Ltd Système de circuit de fluide frigorigène

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JP2006071129A (ja) * 2004-08-31 2006-03-16 Toyo Eng Works Ltd 二元冷凍機による水蒸気発生装置
JP2008267729A (ja) * 2007-04-23 2008-11-06 Mitsubishi Electric Corp 空気調和装置
JP2012088005A (ja) * 2010-10-21 2012-05-10 Mitsubishi Electric Corp ヒートポンプ装置
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JPWO2023012891A1 (fr) * 2021-08-03 2023-02-09
WO2023012891A1 (fr) * 2021-08-03 2023-02-09 三菱電機株式会社 Dispositif à cycle de réfrigération
JP7531721B2 (ja) 2021-08-03 2024-08-09 三菱電機株式会社 冷凍サイクル装置

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