WO2023275916A1 - Dispositif à cycle frigorifique - Google Patents

Dispositif à cycle frigorifique Download PDF

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Publication number
WO2023275916A1
WO2023275916A1 PCT/JP2021/024302 JP2021024302W WO2023275916A1 WO 2023275916 A1 WO2023275916 A1 WO 2023275916A1 JP 2021024302 W JP2021024302 W JP 2021024302W WO 2023275916 A1 WO2023275916 A1 WO 2023275916A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
heat exchanger
air
water
circuit
Prior art date
Application number
PCT/JP2021/024302
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English (en)
Japanese (ja)
Inventor
智広 飛田
進一 内野
和樹 岡田
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2021/024302 priority Critical patent/WO2023275916A1/fr
Publication of WO2023275916A1 publication Critical patent/WO2023275916A1/fr

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    • 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

Definitions

  • FIG. 1 is a circuit diagram showing a refrigeration cycle apparatus 1 according to Embodiment 1.
  • FIG. A refrigeration cycle device 1 is, for example, an air conditioner that adjusts air in an indoor space, and includes a heat source device 2 and an indoor device group 3 as shown in FIG.
  • the indoor equipment group 3 is a general term for pumps, tanks, terminals, etc., which are installed indoors.
  • the heat source device 2 includes a first compressor 6a, a first flow switching device 7a, a water-refrigerant heat exchanger 11, a first expansion section 10a, a heat source blower 9, a second compressor 6b, a second An expansion section 10b and an air-refrigerant heat exchanger 8 are provided.
  • the indoor equipment group 3 is provided with a first pump 22a, a first expansion tank 23a and a first terminal 24a.
  • the refrigeration cycle device 1 includes a first refrigerant circuit 4 a, a second refrigerant circuit 4 b, and a water circuit 20 .
  • the air-refrigerant heat exchanger 8 is connected to the first refrigerant circuit 4a and the second refrigerant circuit 4b, and the first air-refrigerant heat exchanger 8a and the second air-refrigerant heat exchanger 8b.
  • the first air-refrigerant heat exchanger 8a is connected to the first refrigerant circuit 4a
  • the second air-refrigerant heat exchanger 8b is connected to the second refrigerant circuit 4b.
  • the first flow switching device 7a switches the direction in which the refrigerant flows in the first refrigerant circuit 4a, and is, for example, a four-way valve.
  • the water-refrigerant heat exchanger 11 exchanges heat between water and refrigerant.
  • the water-refrigerant heat exchanger 11 acts as a condenser during heating operation, and acts as an evaporator during cooling operation.
  • the first expansion section 10a is a pressure reducing valve or an expansion valve that reduces the pressure of the refrigerant.
  • the first expansion section 10a is, for example, an electronic expansion valve whose opening is adjusted.
  • the first air-refrigerant heat exchanger 8a exchanges heat between the air sent by the heat source blower 9 and the refrigerant.
  • both the heating operation and the cooling operation are of the indirect expansion type.
  • the heating operation will be explained.
  • both the first refrigerant circuit 4a and the second refrigerant circuit 4b are used.
  • both of the two refrigerant circuits are used, but the two refrigerant circuits can be selectively used. For example, when the load on the first terminal 24a is small, capacity control can be performed by operating only one of the refrigerant circuits. Thereby, energy saving can be achieved.
  • the second refrigerant circuit 4b only a refrigerant circuit of a constant-speed compressor may be selected.
  • the refrigerant sucked into the first compressor 6a is compressed by the first compressor 6a and discharged in a high-temperature and high-pressure gas state.
  • the high-temperature and high-pressure gaseous refrigerant discharged from the first compressor 6a passes through the first flow switching device 7a and flows into the water-refrigerant heat exchanger 11 acting as a condenser.
  • the refrigerant is condensed and liquefied by exchanging heat with water flowing in the water circuit 20 in the water-refrigerant heat exchanger 11 . At this time, the water flowing through the water circuit 20 is warmed.
  • the refrigerant sucked into the second compressor 6b is compressed by the second compressor 6b and discharged in a high-temperature and high-pressure gas state.
  • the high-temperature and high-pressure gaseous refrigerant discharged from the second compressor 6b flows into the water-refrigerant heat exchanger 11 acting as a condenser, and in the water-refrigerant heat exchanger 11, the water flowing in the water circuit 20 It condenses and liquefies by exchanging heat. At this time, the water flowing through the water circuit 20 is warmed.
  • cooling operation In cooling operation, only the first refrigerant circuit 4a is used and the second refrigerant circuit 4b is stopped.
  • the refrigerant sucked into the first compressor 6a is compressed by the first compressor 6a and discharged in a high temperature and high pressure gas state.
  • the high-temperature and high-pressure gaseous refrigerant discharged from the first compressor 6a passes through the first flow switching device 7a and flows into the first air-refrigerant heat exchanger 8a acting as a condenser. .
  • the defrosting operation In the defrosting operation, only the first refrigerant circuit 4a is used and the second refrigerant circuit 4b is stopped. In the first refrigerant circuit 4a, the refrigerant sucked into the first compressor 6a is compressed by the first compressor 6a and discharged in a high temperature and high pressure gas state. The high-temperature and high-pressure gaseous refrigerant discharged from the first compressor 6a passes through the first flow switching device 7a and flows into the first air-refrigerant heat exchanger 8a located on the windward side.
  • the heat source refrigerant circuit is shared by the first refrigerant circuit 4a and the second refrigerant circuit 4b, the amount of refrigerant sealed in one refrigerant circuit can be reduced. can be done.
  • one air-refrigerant heat exchanger 8 is divided into the first air-refrigerant heat exchanger 8a and the second air-refrigerant heat exchanger 8b, the space for installing the refrigerant circuit can be reduced. Therefore, the refrigeration cycle apparatus 1 can be made compact while reducing the amount of leaking refrigerant when the refrigerant leaks.
  • the amount of refrigerant enclosed in the refrigerant circuit is relatively large compared to the case of having a plurality of refrigerant circuits, so when the refrigerant leaks, the amount of leakage increases. . Moreover, when it has several refrigerant circuits, the space which installs several refrigerant circuits is needed.
  • the refrigeration cycle device 1 can reduce the amount of refrigerant that leaks when the refrigerant leaks, the refrigerant that circulates in the first refrigerant circuit 4a or the second refrigerant circuit 4b This is particularly effective when a flammable refrigerant classified as highly flammable, such as R290 (propane), is used as the refrigerant.
  • a flammable refrigerant classified as highly flammable such as R290 (propane
  • the cooling operation will be explained.
  • the refrigerant sucked into the first compressor 6a is compressed by the first compressor 6a and discharged in a high temperature and high pressure gas state.
  • the high-temperature and high-pressure gaseous refrigerant discharged from the first compressor 6a passes through the first flow switching device 7a and flows into the first air-refrigerant heat exchanger 8a acting as a condenser.
  • the refrigerant is condensed and liquefied by exchanging heat with the air sent by the heat source blower 9 in the first air refrigerant heat exchanger 8a.
  • FIG. 15 is a flow chart showing the operation of the refrigeration cycle device 1101 according to the eleventh embodiment. Next, the operation of the refrigeration cycle device 1101 will be described. As shown in FIG. 15, first, it is determined whether the first refrigerant circuit 4a is performing heating operation (step S1). When the first refrigerant circuit 4a is performing the heating operation (YES in step S1), it is determined whether the second refrigerant circuit 4b is performing the heating operation (step S2).
  • step S3 When the second refrigerant circuit 4b is performing heating operation (YES in step S2), the evaporation temperature of the first air-refrigerant heat exchanger 8a is below the threshold, or the second air-refrigerant heat exchanger 8b It is determined whether the evaporation temperature of is below a threshold value (step S3).
  • the first air-refrigerant heat exchanger 8a is arranged upstream of the second air-refrigerant heat exchanger 8b in the air flow.
  • a lower area 33 is provided below the first air-refrigerant heat exchanger 8a and the second air-refrigerant heat exchanger 8b so as to be separated from the upper area.
  • the lower region 33 is composed of a first lower region 33a that is the lower portion of the first air-refrigerant heat exchanger 8a and a second lower region 33b that is the lower portion of the second air-refrigerant heat exchanger 8b.
  • the refrigerant that has flowed out (point C-1) from the first expansion section 10a is allowed to flow into the first distributor 30a before flowing into the first distributor 30a. It flows into region 33 .
  • the refrigerant enters the first lower region 33a from one of the lower inlets 34 serving as an inlet, enters the second lower region 33b from the first lower region 33a via a heat transfer tube, and passes through another heat transfer tube. It returns to the first lower area 33a and flows out from the other lower entrance/exit 34, which serves as an outlet, toward the first distributor 30a.
  • Air-refrigerant heat exchanger 83 shown in FIG. 8b and the second regions 31b are alternately arranged in the stepwise direction of the heat transfer tubes, that is, in the longitudinal direction of the fins.
  • the arrangement is not limited to such an arrangement, and a plurality of first regions 31a of the first air-refrigerant heat exchanger 8a may be continuously arranged in the stage direction of the heat transfer tubes (the long side direction of the fins).
  • a plurality of second regions 31b of the second air-refrigerant heat exchanger 8b may be continuously arranged in the stage direction of the heat transfer tubes.
  • the first region 31a and the second region 31b are adjacent to each other in the air flow direction.
  • the step direction of the heat transfer tubes is the vertical direction of the paper surface in FIG. 17 .
  • FIG. 18 is a schematic diagram showing an air-refrigerant heat exchanger 84 according to the fourteenth embodiment.
  • the air-refrigerant heat exchanger 84 of the fourteenth embodiment is provided on the downstream end surface of the first air-refrigerant heat exchanger 8a located on the upstream side in the air flow direction, and on the downstream side in the air flow direction. It is characterized in that the entire upstream end surface of the second air-refrigerant heat exchanger 8b is in contact, and this point will be mainly described.
  • the air-refrigerant heat exchanger 84 has an L-shape that is curved in the middle when viewed from above, and the fins of the first air-refrigerant heat exchanger 8a positioned upstream with respect to the air flow direction
  • the length in the parallel direction is longer than the length in the parallel direction of the fins of the second air-refrigerant heat exchanger 8b located downstream.
  • One end side in the direction in which both fins are arranged is flush with the direction of air flow.
  • the fins of the second air-refrigerant heat exchanger 8b located on the downstream side The entire parallel direction is in contact with the first air-refrigerant heat exchanger 8a located upstream.
  • the air is dehumidified when it passes through the first air-refrigerant heat exchanger 8a on the upstream side, so that the air passing through the second air-refrigerant heat exchanger 8b on the downstream side is The air becomes dehumidified after passing through the first air-refrigerant heat exchanger 8a.
  • the air-refrigerant heat exchanger 84 of the fourteenth embodiment all the air passing through the second air-refrigerant heat exchanger 8b on the downstream side passes through the first air-refrigerant heat exchanger 8a on the upstream side to be dehumidified. air. Therefore, the amount of frost adhering to the second air-refrigerant heat exchanger 8b on the downstream side can be reduced. Further, during the defrosting operation, the condensation heat of the refrigerant when the first air-refrigerant heat exchanger 8a on the upstream side is defrosted melts the frost on the entire second air-refrigerant heat exchanger 8b on the downstream side. can also

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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'invention concerne un dispositif à cycle frigorifique qui comprend : un premier circuit de fluide frigorigène dans lequel un premier compresseur, un premier dispositif de commutation de trajet d'écoulement, un échangeur de chaleur eau/fluide frigorigène et une première unité d'expansion sont reliés par une première tuyauterie de fluide frigorigène ; un second circuit de fluide frigorigène dans lequel un second compresseur, l'échangeur de chaleur eau/fluide frigorigène et une seconde unité d'expansion sont reliés par une seconde tuyauterie de fluide frigorigène ; un échangeur de chaleur air/fluide frigorigène relié aux premier et second circuits de fluide frigorigène ; et un circuit d'eau dans lequel une pompe, l'échangeur de chaleur eau/fluide frigorigène et une borne sont reliés par une tuyauterie d'eau. L'échangeur de chaleur air/fluide frigorigène est divisé en un premier échangeur de chaleur air/fluide frigorigène relié au premier circuit de fluide frigorigène, et un second échangeur de chaleur air/fluide frigorigène relié au second circuit de fluide frigorigène.
PCT/JP2021/024302 2021-06-28 2021-06-28 Dispositif à cycle frigorifique WO2023275916A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/024302 WO2023275916A1 (fr) 2021-06-28 2021-06-28 Dispositif à cycle frigorifique

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Application Number Priority Date Filing Date Title
PCT/JP2021/024302 WO2023275916A1 (fr) 2021-06-28 2021-06-28 Dispositif à cycle frigorifique

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WO2023275916A1 true WO2023275916A1 (fr) 2023-01-05

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62272041A (ja) * 1986-05-20 1987-11-26 Matsushita Refrig Co 多室冷暖房装置
JP2012180970A (ja) * 2011-03-01 2012-09-20 Mitsubishi Electric Corp 冷凍サイクル装置
JP2014219186A (ja) * 2013-04-12 2014-11-20 ダイキン工業株式会社 チラー装置
WO2018225257A1 (fr) * 2017-06-09 2018-12-13 三菱電機株式会社 Équipement utilisant une pompe à chaleur
WO2019171486A1 (fr) * 2018-03-07 2019-09-12 三菱電機株式会社 Dispositif source de chaleur et système à cycle frigorifique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62272041A (ja) * 1986-05-20 1987-11-26 Matsushita Refrig Co 多室冷暖房装置
JP2012180970A (ja) * 2011-03-01 2012-09-20 Mitsubishi Electric Corp 冷凍サイクル装置
JP2014219186A (ja) * 2013-04-12 2014-11-20 ダイキン工業株式会社 チラー装置
WO2018225257A1 (fr) * 2017-06-09 2018-12-13 三菱電機株式会社 Équipement utilisant une pompe à chaleur
WO2019171486A1 (fr) * 2018-03-07 2019-09-12 三菱電機株式会社 Dispositif source de chaleur et système à cycle frigorifique

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