WO2022118843A1 - 冷凍サイクルシステム - Google Patents
冷凍サイクルシステム Download PDFInfo
- Publication number
- WO2022118843A1 WO2022118843A1 PCT/JP2021/043883 JP2021043883W WO2022118843A1 WO 2022118843 A1 WO2022118843 A1 WO 2022118843A1 JP 2021043883 W JP2021043883 W JP 2021043883W WO 2022118843 A1 WO2022118843 A1 WO 2022118843A1
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- WO
- WIPO (PCT)
- Prior art keywords
- refrigerant
- primary side
- pipe
- heat exchanger
- secondary side
- Prior art date
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 87
- 239000003507 refrigerant Substances 0.000 claims abstract description 418
- 238000004781 supercooling Methods 0.000 description 85
- 239000007788 liquid Substances 0.000 description 61
- 230000006870 function Effects 0.000 description 46
- 238000010438 heat treatment Methods 0.000 description 35
- 238000001816 cooling Methods 0.000 description 34
- 239000003921 oil Substances 0.000 description 27
- 230000009977 dual effect Effects 0.000 description 15
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 14
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 8
- 229910002092 carbon dioxide Inorganic materials 0.000 description 7
- 239000001569 carbon dioxide Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 239000012071 phase Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000010721 machine oil Substances 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- CDOOAUSHHFGWSA-OWOJBTEDSA-N (e)-1,3,3,3-tetrafluoroprop-1-ene Chemical compound F\C=C\C(F)(F)F CDOOAUSHHFGWSA-OWOJBTEDSA-N 0.000 description 1
- FXRLMCRCYDHQFW-UHFFFAOYSA-N 2,3,3,3-tetrafluoropropene Chemical compound FC(=C)C(F)(F)F FXRLMCRCYDHQFW-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical compound FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
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
- 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
-
- 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
- F25B41/40—Fluid line arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
- F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
-
- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
Definitions
- the present invention relates to a refrigeration cycle system.
- Patent Document 1 International Publication No. 2018/235832
- Patent Document 1 International Publication No. 2018/235832
- the dual refrigeration system When configuring the dual refrigeration system as described above, it may be desired to divert the heat source unit used in other refrigeration equipment other than the dual refrigeration system as the heat source unit constituting the refrigerant circuit on the primary side. be.
- the heat source unit used for the directly expanding refrigerating device that expands the refrigerant near the utilization side in the refrigerating cycle is diverted as the heat source unit on the primary side of the dual refrigerating device, as the heat source unit, Refrigerant filled in the heat source unit to be diverted tends to be left over.
- the refrigeration cycle system includes a first circuit, a second circuit, a first casing, and a second casing.
- the first circuit is a circuit in which the first refrigerant circulates.
- the first circuit includes a first compressor, a cascade heat exchanger, a receiver, and a first heat exchanger.
- the second circuit is a circuit in which the second refrigerant circulates.
- the second circuit includes a second compressor, a cascade heat exchanger, and a second heat exchanger.
- the first casing houses the first compressor.
- the second casing houses the second compressor.
- the receiver is provided outside the first casing.
- the cascade heat exchanger may be one that causes heat exchange between the first refrigerant and the second refrigerant.
- the receiver of the first circuit is provided outside the first casing. This makes it possible to suppress the surplus of the refrigerant in the first circuit even when the heat source unit used in the directly inflatable refrigerating apparatus is diverted as the heat source unit on the primary side of the dual refrigerating apparatus.
- the refrigeration cycle system according to the second aspect is the refrigeration cycle system according to the first aspect, and the cascade heat exchanger is provided in the second casing.
- the cascade heat exchanger may be housed inside the second casing. Further, the cascade heat exchanger may be housed inside a casing different from the second casing, and the other casing and the second casing may be unitized.
- the refrigeration cycle system according to the third aspect is the refrigeration cycle system according to the first aspect or the second aspect, and the receiver is provided in the second casing.
- the receiver may be housed inside the second casing. Further, the receiver may be housed inside a casing different from the second casing, and the other casing and the second casing may be unitized.
- the refrigeration cycle system according to the fourth aspect further includes a first casing and a third casing that is separate from the second casing in the refrigeration cycle system according to the first aspect or the second aspect.
- the receiver is housed in a third casing.
- the first casing and the second casing can be miniaturized.
- the refrigeration cycle system is the refrigeration cycle system according to any one of the first to third aspects, and the cascade heat exchanger and the receiver are provided in the second casing.
- the first circuit has a first pipe and a second pipe.
- the first pipe extends out of the second casing from the cascade heat exchanger.
- the second pipe extends from the receiver to the outside of the second casing.
- the second casing has a plurality of surfaces. An opening through which the first pipe and the second pipe pass, or an opening through which the first pipe passes and the second pipe pass through are provided on one of the plurality of surfaces.
- the second casing may be substantially a hexahedron.
- the refrigeration cycle system according to the sixth aspect is the refrigeration cycle system according to any one of the first aspect to the fifth aspect, and the first circuit has an expansion valve provided between the cascade heat exchanger and the receiver. There is.
- This refrigeration cycle system makes it possible to adjust the flow rate of the first refrigerant flowing between the cascade heat exchanger and the receiver.
- FIG. 1 is a schematic configuration diagram of the refrigeration cycle system 1.
- FIG. 2 is a schematic functional block configuration diagram of the refrigeration cycle system 1.
- the refrigeration cycle system 1 is a device used for heating and cooling indoors of buildings and the like by performing a steam compression type refrigeration cycle operation.
- the refrigeration cycle system 1 has a dual refrigerant circuit including a steam compression type primary side refrigerant circuit 5a (corresponding to the first circuit) and a steam compression type secondary side refrigerant circuit 10 (corresponding to the second circuit). And perform a dual refrigeration cycle.
- R32 corresponding to the first refrigerant
- R32 or the like is enclosed in the primary side refrigerant circuit 5a as a refrigerant.
- carbon dioxide corresponding to the second refrigerant
- the primary side refrigerant circuit 5a and the secondary side refrigerant circuit 10 are thermally connected via a cascade heat exchanger 35 described later.
- the refrigeration cycle system 1 is configured by connecting a primary side unit 5, a heat source unit 2, a plurality of branch units 6a, 6b, 6c, and a plurality of utilization units 3a, 3b, 3c to each other via pipes. ing.
- the primary side unit 5 and the heat source unit 2 are connected by a primary side first connecting pipe 111 and a primary side second connecting pipe 112.
- the heat source unit 2 and the plurality of branch units 6a, 6b, 6c are connected by three refrigerant connecting pipes, that is, the secondary side second connecting pipe 9, the secondary side first connecting pipe 8, and the secondary side third connecting pipe 7. Has been done.
- the plurality of branch units 6a, 6b, 6c and the plurality of utilization units 3a, 3b, 3c are connected by the first connection pipes 15a, 15b, 15c and the second connection pipes 16a, 16b, 16c.
- the primary side unit 5 is one in this embodiment.
- the heat source unit 2 is one in this embodiment.
- the plurality of utilization units 3a, 3b, and 3c are the first utilization unit 3a, the second utilization unit 3b, and the third utilization unit 3c.
- the plurality of branch units 6a, 6b, and 6c are the first branch unit 6a, the second branch unit 6b, and the third branch unit 6c.
- each of the utilization units 3a, 3b, and 3c can individually perform the cooling operation or the heating operation, and the refrigerant is transferred from the utilization unit that performs the heating operation to the utilization unit that performs the cooling operation. It is configured so that heat can be recovered between the units used by sending it. Specifically, in the present embodiment, heat recovery is performed by performing cooling-based operation or heating-based operation in which cooling operation and heating operation are performed at the same time. Further, in the refrigeration cycle system 1, the heat load of the heat source unit 2 is balanced according to the heat load of the entire plurality of utilization units 3a, 3b, and 3c in consideration of the above heat recovery (cooling main operation and heating main operation). It is configured as follows.
- the primary side refrigerant circuit 5a includes a primary side compressor 71 (corresponding to the first compressor), a primary side switching mechanism 72, and a primary side heat exchanger 74 (corresponding to the first heat exchanger). ), The primary side first expansion valve 76, the primary side supercooling heat exchanger 103, the primary side supercooling circuit 104, the primary side supercooling expansion valve 104a, the first liquid closing valve 108, and the primary side first. 1 connecting pipe 111 (corresponding to the first pipe), a second liquid closing valve 106, a first connecting pipe 115, a primary side receiver 101, a third connecting pipe 114, and a primary side second expansion valve 102 (expansion).
- a cascade heat exchanger 35 shared with the secondary side refrigerant circuit 10, a second connection pipe 113, a second gas closing valve 107, and a primary side second connecting pipe 112 (second pipe). It has a first gas shutoff valve 109 and a primary side accumulator 105.
- the primary side compressor 71 is a device for compressing the refrigerant on the primary side. For example, from a displacement type compressor such as a scroll type that can change the operating capacity by controlling the compressor motor 71a with an inverter. Become.
- the primary side accumulator 105 is provided in the middle of the suction flow path connecting the primary side switching mechanism 72 and the suction side of the primary side compressor 71.
- the primary side switching mechanism 72 is provided on the suction side of the primary side compressor 71 and the gas side of the primary side flow path 35b of the cascade heat exchanger 35. It becomes the fifth connection state to connect with (see the solid line of the primary side switching mechanism 72 in FIG. 1). Further, when the cascade heat exchanger 35 functions as a radiator of the refrigerant on the primary side, the primary side switching mechanism 72 of the discharge side of the primary side compressor 71 and the primary side flow path 35b of the cascade heat exchanger 35. A sixth connection state is established in which the gas side is connected (see the broken line of the primary side switching mechanism 72 in FIG. 1).
- the primary side switching mechanism 72 is a device capable of switching the flow path of the refrigerant in the primary side refrigerant circuit 5a, and includes, for example, a four-way switching valve. Then, by changing the switching state of the primary side switching mechanism 72, it is possible to make the cascade heat exchanger 35 function as an evaporator or a radiator of the refrigerant on the primary side.
- the cascade heat exchanger 35 is a device for allowing heat exchange between a refrigerant such as R32, which is a refrigerant on the primary side, and a refrigerant such as carbon dioxide, which is a refrigerant on the secondary side, without mixing with each other.
- the cascade heat exchanger 35 comprises, for example, a plate type heat exchanger.
- the cascade heat exchanger 35 has a secondary side flow path 35a belonging to the secondary side refrigerant circuit 10 and a primary side flow path 35b belonging to the primary side refrigerant circuit 5a.
- the gas side of the secondary side flow path 35a is connected to the secondary side switching mechanism 22 via the third heat source pipe 25, and the liquid side thereof is connected to the heat source side expansion valve 36 via the fourth heat source pipe 26. ..
- the gas side of the primary side flow path 35b is compressed on the primary side via a second connecting pipe 113, a second gas closing valve 107, a primary side second connecting pipe 112, a first gas closing valve 109, and a primary side switching mechanism 72. It is connected to the machine 71, and its liquid side is connected to the primary side second expansion valve 102 provided in the third connection pipe 114.
- the primary side heat exchanger 74 is a device for exchanging heat between the refrigerant on the primary side and the outdoor air.
- the gas side of the primary side heat exchanger 74 is connected to a pipe extending from the primary side switching mechanism 72.
- the primary side heat exchanger 74 comprises, for example, a fin-and-tube heat exchanger composed of a large number of heat transfer tubes and fins.
- the primary side first expansion valve 76 is provided in a liquid pipe extending from the liquid side of the primary side heat exchanger 74 to the primary side supercooling heat exchanger 103.
- the primary side first expansion valve 76 is an electric expansion valve capable of adjusting the opening degree, which adjusts the flow rate of the primary side refrigerant flowing through the liquid side portion of the primary side refrigerant circuit 5a.
- the primary side supercooling circuit 104 branches from between the primary side first expansion valve 76 and the primary side supercooling heat exchanger 103, and is located between the primary side switching mechanism 72 and the primary side accumulator 105 in the suction flow path. It is connected to the part.
- the primary side supercooling expansion valve 104a is provided on the upstream side of the primary side supercooling heat exchanger 103 in the primary side supercooling circuit 104, and adjusts the opening degree to adjust the flow rate of the refrigerant on the primary side. It is an electric expansion valve that can be used.
- the primary side supercooling heat exchanger 103 includes a refrigerant flowing from the primary side first expansion valve 76 toward the first liquid closing valve 108 and a refrigerant decompressed in the primary side supercooling expansion valve 104a in the primary side supercooling circuit 104. It is a heat exchanger that exchanges heat with and.
- the primary side first connecting pipe 111 is a pipe connecting the first liquid closing valve 108 and the second liquid closing valve 106, and connects the primary side unit 5 and the heat source unit 2.
- the primary side second connecting pipe 112 is a pipe connecting the first gas closing valve 109 and the second gas closing valve 107, and connects the primary side unit 5 and the heat source unit 2.
- the first connection pipe 115 is a pipe extending from the second liquid closing valve 106 to the inside of the primary side receiver 101.
- the third connection pipe 114 is a pipe extending from the liquid side of the primary side flow path 35b of the cascade heat exchanger 35 to the inside of the primary side receiver 101.
- the primary side second expansion valve 102 is provided in the third connection pipe 114.
- the primary side receiver 101 is a refrigerant container capable of storing excess refrigerant among the primary side refrigerants in the primary side refrigerant circuit 5a.
- the lower liquid phase region inside the primary side receiver 101 extends from the end of the first connection pipe 115 extending from the second liquid closing valve 106 and the liquid side of the primary side flow path 35b of the cascade heat exchanger 35.
- the end of the third connection pipe 114 is located.
- outlets in the primary side receiver 101 of the third connection pipe 114 and the first connection pipe 115 both face downward. As a result, foaming of the refrigerant on the primary side in the receiver 101 on the primary side is suppressed.
- the second connection pipe 113 is a pipe extending from the gas side of the primary side flow path 35b of the cascade heat exchanger 35 to the second gas closing valve 107.
- the first gas closing valve 109 is provided between the primary side second connecting pipe 112 and the primary side switching mechanism 72.
- the secondary refrigerant circuit 10 is configured by connecting a plurality of utilization units 3a, 3b, 3c, a plurality of branch units 6a, 6b, 6c, and a heat source unit 2 to each other. ing.
- Each utilization unit 3a, 3b, 3c is connected to the corresponding branch units 6a, 6b, 6c on a one-to-one basis.
- the utilization unit 3a and the branch unit 6a are connected via the first connection pipe 15a and the second connection pipe 16a
- the utilization unit 3b and the branch unit 6b are connected to the first connection pipe 15b and the second connection pipe.
- each branch unit 6a, 6b, 6c includes a heat source unit 2, a secondary side third connecting pipe 7, a secondary side first connecting pipe 8, and a secondary side second connecting pipe 9, which are three connecting pipes. It is connected via.
- the secondary side third connecting pipe 7, the secondary side first connecting pipe 8, and the secondary side second connecting pipe 9 extending from the heat source unit 2 are each branched into a plurality of branches, and each branch is formed. It is connected to the units 6a, 6b, 6c.
- a refrigerant in either a gas-liquid two-phase state or a gas state refrigerant flows through the secondary side first connecting pipe 8 depending on the operating state.
- the refrigerant in the supercritical state flows through the first connecting pipe 8 on the secondary side according to the operating state.
- a refrigerant in either a gas-liquid two-phase state or a gas-state refrigerant flows through the secondary side second connecting pipe 9, depending on the operating state.
- a refrigerant in either a gas-liquid two-phase state or a liquid-state refrigerant flows through the secondary side third connecting pipe 7, depending on the operating state.
- the refrigerant in the supercritical state flows through the secondary side third connecting pipe 7 according to the operating state.
- the secondary side refrigerant circuit 10 is configured by connecting the heat source circuit 12, the branch circuits 14a, 14b, 14c, and the utilization circuits 13a, 13b, 13c to each other.
- the heat source circuit 12 mainly includes a secondary side compressor 21 (corresponding to a second compressor), a secondary side switching mechanism 22, a first heat source pipe 28, a second heat source pipe 29, and a suction flow path 23. ,
- the secondary side compressor 21 is a device for compressing the refrigerant on the secondary side.
- positive displacement compression such as a scroll type capable of varying the operating capacity by controlling the compressor motor 21a with an inverter. It consists of a machine.
- the secondary compressor 21 is controlled so that the larger the load, the larger the operating capacity, depending on the load during operation.
- the secondary side switching mechanism 22 is a mechanism capable of switching the connection state of the secondary side refrigerant circuit 10, particularly the flow path of the refrigerant in the heat source circuit 12.
- the secondary side switching mechanism 22 is configured by providing four switching valves 22a, 22b, 22c, and 22d, which are two-way valves, side by side in an annular flow path.
- the secondary side switching mechanism 22 instead of this, a combination of a plurality of three-way switching valves may be used.
- the secondary side switching mechanism 22 is a flow that connects the first switching valve 22a provided in the flow path connecting the discharge flow path 24 and the third heat source pipe 25, and the discharge flow path 24 and the first heat source pipe 28.
- the second switching valve 22b provided in the path, the third switching valve 22c provided in the flow path connecting the suction flow path 23 and the third heat source pipe 25, the suction flow path 23, and the first heat source pipe 28. It has a fourth switching valve 22d provided in the flow path connecting the two.
- the first switching valve 22a, the second switching valve 22b, the third switching valve 22c, and the fourth switching valve 22d are solenoid valves that can switch between an open state and a closed state, respectively.
- the secondary side switching mechanism 22 keeps the first switching valve 22a open and cascade heat with the discharge side of the secondary compressor 21.
- the first connection state is set in which the third switching valve 22c is closed while connecting to the gas side of the secondary side flow path 35a of the exchanger 35.
- the secondary side switching mechanism 22 opens the third switching valve 22c to the suction side of the secondary compressor 21.
- the second connection state is set so that the first switching valve 22a is closed while connecting to the gas side of the secondary side flow path 35a of the cascade heat exchanger 35.
- the secondary side switching mechanism 22 sends the secondary side refrigerant discharged from the secondary side compressor 21 to the secondary side first connecting pipe 8, the second switching valve 22b is opened. While connecting the discharge side of the secondary side compressor 21 and the secondary side first connecting pipe 8, the fourth switching valve 22d is closed in the third connection state. Further, when the refrigerant flowing through the secondary side first connecting pipe 8 is sucked into the secondary side compressor 21, the secondary side switching mechanism 22 keeps the fourth switching valve 22d open and makes the secondary side first contact. While connecting the pipe 8 and the suction side of the secondary compressor 21, the second switching valve 22b is closed in the fourth connection state.
- the cascade heat exchanger 35 causes heat exchange between the refrigerant such as R32 which is the primary side refrigerant and the refrigerant such as carbon dioxide which is the secondary side refrigerant without mixing with each other. It is a device for.
- the cascade heat exchanger 35 includes a secondary side flow path 35a through which the secondary side refrigerant of the secondary side refrigerant circuit 10 flows, and a primary side flow path 35b through which the primary side refrigerant of the primary side refrigerant circuit 5a flows. Is shared by the primary side unit 5 and the heat source unit 2.
- the cascade heat exchanger 35 is arranged inside the heat source casing 2x of the heat source unit 2.
- the gas side of the primary side flow path 35b of the cascade heat exchanger 35 extends to the primary side second connecting pipe 112 outside the heat source casing 2x via the second connecting pipe 113 and the second gas closing valve 107.
- the liquid side of the primary side flow path 35b of the cascade heat exchanger 35 passes through the third connection pipe 114, the primary side second expansion valve 102, the primary side receiver 101, the first connection pipe 115, and the second liquid closing valve 106. It extends to the primary side first connecting pipe 111 outside the heat source casing 2x.
- the heat source side expansion valve 36 is an electric expansion valve connected to the liquid side of the cascade heat exchanger 35 and capable of adjusting the opening degree in order to adjust the flow rate of the refrigerant on the secondary side flowing through the cascade heat exchanger 35. Is.
- the heat source side expansion valve 36 is provided in the fourth heat source pipe 26.
- the third closing valve 31, the first closing valve 32, and the second closing valve 33 are valves provided at connection ports with external equipment / piping (specifically, connecting pipes 7, 8 and 9). Specifically, the third closing valve 31 is connected to the secondary side third connecting pipe 7 drawn from the heat source unit 2. The first shutoff valve 32 is connected to the secondary side first connecting pipe 8 drawn from the heat source unit 2. The second shutoff valve 33 is connected to the secondary side second connecting pipe 9 drawn from the heat source unit 2.
- the first heat source pipe 28 is a refrigerant pipe that connects the first closing valve 32 and the secondary side switching mechanism 22. Specifically, the first heat source pipe 28 connects the first closing valve 32 and the portion of the secondary side switching mechanism 22 between the second switching valve 22b and the fourth switching valve 22d. There is.
- the suction flow path 23 is a flow path that connects the secondary side switching mechanism 22 and the suction side of the secondary side compressor 21. Specifically, the suction flow path 23 has a portion of the secondary side switching mechanism 22 between the third switching valve 22c and the fourth switching valve 22d, and the suction side of the secondary side compressor 21. You are connected.
- a secondary accumulator 30 is provided in the middle of the suction flow path 23.
- the second heat source pipe 29 is a refrigerant pipe that connects the second closing valve 33 and the middle of the suction flow path 23.
- the second heat source pipe 29 is the portion of the suction flow path 23 between the second switching valve 22b and the fourth switching valve 22d in the secondary side switching mechanism 22, and the secondary side accumulator 30. It is connected to the suction flow path 23 at the connection point which is a portion between and.
- the discharge flow path 24 is a refrigerant pipe that connects the discharge side of the secondary side compressor 21 and the secondary side switching mechanism 22. Specifically, the discharge flow path 24 has a discharge side of the secondary side compressor 21 and a portion of the secondary side switching mechanism 22 between the first switching valve 22a and the second switching valve 22b. You are connected.
- the third heat source pipe 25 is a refrigerant pipe that connects the secondary side switching mechanism 22 and the gas side of the cascade heat exchanger 35.
- the third heat source pipe 25 includes a portion of the secondary side switching mechanism 22 between the first switching valve 22a and the third switching valve 22c and the secondary side flow path in the cascade heat exchanger 35. It is connected to the gas side end of 35a.
- the fourth heat source pipe 26 has the liquid side of the cascade heat exchanger 35 (the side opposite to the gas side and the side opposite to the side where the secondary side switching mechanism 22 is provided) and the secondary side receiver 45. It is a refrigerant pipe to be connected. Specifically, the fourth heat source pipe 26 connects the liquid side end portion (the end portion on the opposite side to the gas side) of the secondary side flow path 35a in the cascade heat exchanger 35 and the secondary side receiver 45. is doing.
- the secondary side receiver 45 is a refrigerant container for storing excess refrigerant in the secondary side refrigerant circuit 10.
- a fourth heat source pipe 26, a fifth heat source pipe 27, and a bypass circuit 46 extend from the secondary receiver 45.
- the bypass circuit 46 is a refrigerant pipe that connects the gas phase region, which is the upper region inside the secondary receiver 45, and the suction flow path 23. Specifically, the bypass circuit 46 is connected between the secondary side switching mechanism 22 and the secondary side accumulator 30 in the suction flow path 23.
- the bypass circuit 46 is provided with a bypass expansion valve 46a.
- the bypass expansion valve 46a is an electric expansion valve capable of adjusting the amount of the refrigerant guided from the inside of the secondary side receiver 45 to the suction side of the secondary side compressor 21 by adjusting the opening degree.
- the fifth heat source pipe 27 is a refrigerant pipe that connects the secondary side receiver 45 and the third closing valve 31.
- the secondary side supercooling circuit 48 is a refrigerant pipe that connects a part of the fifth heat source pipe 27 and the suction flow path 23. Specifically, the secondary side supercooling circuit 48 is connected between the secondary side switching mechanism 22 and the secondary side accumulator 30 in the suction flow path 23. In the present embodiment, the secondary side supercooling circuit 48 extends so as to branch from between the secondary side receiver 45 and the secondary side supercooling heat exchanger 47.
- the secondary side supercooling heat exchanger 47 is a heat exchanger that exchanges heat between the refrigerant flowing through the flow path belonging to the fifth heat source pipe 27 and the refrigerant flowing through the flow path belonging to the secondary side supercooling circuit 48.
- the fifth heat source pipe 27 is provided between the portion where the secondary side supercooling circuit 48 is branched and the third shutoff valve 31.
- the secondary side supercooling expansion valve 48a is provided between the branch point from the fifth heat source pipe 27 in the secondary side supercooling circuit 48 and the secondary side supercooling heat exchanger 47.
- the secondary side supercooling expansion valve 48a supplies a reduced pressure refrigerant to the secondary side supercooling heat exchanger 47, and is an electric expansion valve whose opening degree can be adjusted.
- the secondary side accumulator 30 is a container capable of storing the secondary side refrigerant, and is provided on the suction side of the secondary side compressor 21.
- the oil separator 34 is provided in the middle of the discharge flow path 24.
- the oil separator 34 is a device for separating the refrigerating machine oil discharged from the secondary side compressor 21 along with the secondary side refrigerant from the secondary side refrigerant and returning it to the secondary side compressor 21. ..
- the oil return circuit 40 is provided so as to connect the oil separator 34 and the suction flow path 23.
- the oil return circuit 40 extends so that the flow path extending from the oil separator 34 joins the portion of the suction flow path 23 between the secondary accumulator 30 and the suction side of the secondary compressor 21. It has an oil return flow path 41.
- An oil return capillary tube 42 and an oil return on-off valve 44 are provided in the middle of the oil return flow path 41.
- the oil return on-off valve 44 maintains the open state for a predetermined time and the closed state for a predetermined time when the secondary side compressor 21 is in the operating state in the secondary side refrigerant circuit 10. By repeating this, the amount of refrigerating machine oil returned through the oil return circuit 40 is controlled.
- the oil return on-off valve 44 is a solenoid valve whose opening and closing is controlled in the present embodiment, the oil return capillary tube 42 may be omitted while being an electric expansion valve capable of adjusting the opening degree.
- the utilization circuits 13a, 13b, and 13c will be described. However, since the utilization circuits 13b and 13c have the same configuration as the utilization circuit 13a, the utilization circuits 13b and 13c are referred to by reference numerals indicating each part of the utilization circuit 13a. Instead of “a”, the subscript of "b” or “c” is added, and the description of each part is omitted.
- the utilization circuit 13a mainly has a utilization side heat exchanger 52a (corresponding to a second heat exchanger), a first utilization pipe 57a, a second utilization pipe 56a, and a utilization side expansion valve 51a. ..
- the user-side heat exchanger 52a is a device for exchanging heat between the refrigerant and the indoor air, and includes, for example, a fin-and-tube heat exchanger composed of a large number of heat transfer tubes and fins.
- the plurality of user-side heat exchangers 52a, 52b, and 52c are connected in parallel to the secondary side switching mechanism 22, the suction flow path 23, and the cascade heat exchanger 35.
- One end of the second utilization pipe 56a is connected to the liquid side (the side opposite to the gas side) of the utilization side heat exchanger 52a of the first utilization unit 3a.
- the other end of the second utilization pipe 56a is connected to the second connection pipe 16a.
- the above-mentioned utilization side expansion valve 51a is provided in the middle of the second utilization pipe 56a.
- the user-side expansion valve 51a is an electric expansion valve capable of adjusting the opening degree, which adjusts the flow rate of the refrigerant flowing through the user-side heat exchanger 52a.
- the utilization side expansion valve 51a is provided in the second utilization pipe 56a.
- One end of the first utilization pipe 57a is connected to the gas side of the utilization side heat exchanger 52a of the first utilization unit 3a.
- the first utilization pipe 57a is connected to the side opposite to the utilization side expansion valve 51a side of the utilization side heat exchanger 52a.
- the other end of the first utilization pipe 57a is connected to the first connection pipe 15a.
- branch circuits 14a, 14b, and 14c will be described. However, since the branch circuits 14b and 14c have the same configuration as the branch circuits 14a, the branch circuits 14b and 14c are referred to by reference numerals indicating each part of the branch circuits 14a. Instead of “a”, the subscript of "b” or “c” is added, and the description of each part is omitted.
- the branch circuit 14a mainly has a merging pipe 62a, a first branch pipe 63a, a second branch pipe 64a, a first control valve 66a, a second control valve 67a, and a third branch pipe 61a. ing.
- One end of the merging pipe 62a is connected to the first connecting pipe 15a.
- a first branch pipe 63a and a second branch pipe 64a are branched and connected to the other end of the merging pipe 62a.
- the side of the first branch pipe 63a opposite to the merging pipe 62 side is connected to the secondary side first connecting pipe 8.
- the first branch pipe 63a is provided with a first control valve 66a that can be opened and closed.
- the first control valve 66a an electric expansion valve capable of adjusting the opening degree is adopted, but an electromagnetic valve or the like capable of only opening and closing may be adopted.
- the side of the second branch pipe 64a opposite to the merging pipe 62 side is connected to the secondary side second connecting pipe 9.
- the second branch pipe 64a is provided with a second control valve 67a that can be opened and closed.
- the second control valve 67a an electric expansion valve capable of adjusting the opening degree is adopted, but a solenoid valve or the like capable of opening and closing only may be adopted.
- One end of the third branch pipe 61a is connected to the second connection pipe 16a.
- the other end of the third branch pipe 61a is connected to the secondary side third connecting pipe 7.
- the first branch unit 6a can function as follows by opening the first control valve 66a and the second control valve 67a when performing the cooling operation described later.
- the first branch unit 6a sends the refrigerant flowing into the third branch pipe 61a through the secondary side third connecting pipe 7 to the second connecting pipe 16a.
- the refrigerant flowing through the second utilization pipe 56a of the first utilization unit 3a through the second connection pipe 16a is sent to the utilization side heat exchanger 52a of the first utilization unit 3a through the utilization side expansion valve 51a.
- the refrigerant sent to the user-side heat exchanger 52a evaporates by heat exchange with the indoor air, and then flows through the first connection pipe 15a via the first utilization pipe 57a.
- the refrigerant flowing through the first connecting pipe 15a is sent to the merging pipe 62a of the first branch unit 6a.
- the refrigerant flowing through the merging pipe 62a branches into the first branch pipe 63a and the second branch pipe 64a and flows.
- the refrigerant that has passed through the first control valve 66a in the first branch pipe 63a is sent to the secondary side first connecting pipe 8.
- the refrigerant that has passed through the second control valve 67a in the second branch pipe 64a is sent to the secondary side second connecting pipe 9.
- the first control valve 66a when the room is cooled in the first utilization unit 3a when the cooling main operation and the heating main operation described later are performed, the first control valve 66a is closed. At the same time, by opening the second control valve 67a, the function can be as follows.
- the first branch unit 6a sends the refrigerant flowing into the third branch pipe 61a through the secondary side third connecting pipe 7 to the second connecting pipe 16a.
- the refrigerant flowing through the second utilization pipe 56a of the first utilization unit 3a through the second connection pipe 16a is sent to the utilization side heat exchanger 52a of the first utilization unit 3a through the utilization side expansion valve 51a.
- the refrigerant sent to the user-side heat exchanger 52a evaporates by heat exchange with the indoor air, and then flows through the first connection pipe 15a via the first utilization pipe 57a.
- the refrigerant flowing through the first connecting pipe 15a is sent to the merging pipe 62a of the first branch unit 6a.
- the refrigerant that has flowed through the merging pipe 62a flows into the second branch pipe 64a, passes through the second control valve 67a, and is then sent to the secondary side second connecting pipe 9.
- the second control valve 67a is opened or closed according to the operating condition as described later, and the first control valve 66a is opened.
- the first branch unit 6a the refrigerant flowing into the first branch pipe 63a through the secondary side first connecting pipe 8 passes through the first control valve 66a and is sent to the merging pipe 62a.
- the refrigerant flowing through the merging pipe 62a flows through the first utilization pipe 57a of the utilization unit 3a via the first connection pipe 15a and is sent to the utilization side heat exchanger 52a.
- the refrigerant sent to the user-side heat exchanger 52a dissipates heat by heat exchange with the indoor air, and then passes through the user-side expansion valve 51a provided in the second utilization pipe 56a.
- the refrigerant that has passed through the second utilization pipe 56a flows through the third branch pipe 61a of the first branch unit 6a via the second connection pipe 16a, and then is sent to the secondary side third communication pipe 7.
- the second control valve 67a is closed.
- the function can be as follows.
- the refrigerant flowing into the first branch pipe 63a through the secondary side first connecting pipe 8 passes through the first control valve 66a and is sent to the merging pipe 62a.
- the refrigerant flowing through the merging pipe 62a flows through the first utilization pipe 57a of the utilization unit 3a via the first connection pipe 15a and is sent to the utilization side heat exchanger 52a.
- the refrigerant sent to the user-side heat exchanger 52a dissipates heat by heat exchange with the indoor air, and then passes through the user-side expansion valve 51a provided in the second utilization pipe 56a.
- the refrigerant that has passed through the second utilization pipe 56a flows through the third branch pipe 61a of the first branch unit 6a via the second connection pipe 16a, and then is sent to the secondary side third communication pipe 7.
- Such a function has not only the first branch unit 6a but also the second branch unit 6b and the third branch unit 6c. Therefore, the first branch unit 6a, the second branch unit 6b, and the third branch unit 6c each function as a refrigerant evaporator for each of the user-side heat exchangers 52a, 52b, and 52c. , It is possible to switch individually whether to function as a radiator for the refrigerant.
- the primary side unit 5 is installed in a space different from the space in which the utilization units 3a, 3b, 3c and the branch units 6a, 6b, 6c are arranged, a rooftop, or the like.
- the primary side unit 5 includes a part of the above-mentioned primary side refrigerant circuit 5a, a primary side fan 75, various sensors, a primary side control unit 70, and a primary side casing 5x (in the first casing) as shown in FIG. Equivalent) and.
- the primary side unit 5 includes a primary side compressor 71, a primary side switching mechanism 72, a primary side heat exchanger 74, a primary side primary expansion valve 76, and a primary side supercooling as a part of the primary side refrigerant circuit 5a.
- the primary side casing includes the cooling heat exchanger 103, the primary side supercooling circuit 104, the primary side supercooling expansion valve 104a, the first liquid closing valve 108, the first gas closing valve 109, and the primary side accumulator 105. It has in 5x.
- the primary side fan 75 is provided in the primary side unit 5, and after guiding outdoor air to the primary side heat exchanger 74 and exchanging heat with the primary side refrigerant flowing through the primary side heat exchanger 74, it is outdoors. Creates an air flow that causes the air to be discharged.
- the primary fan 75 is driven by the primary fan motor 75a.
- various sensors are provided on the primary side unit 5. Specifically, the outside air temperature sensor 77 that detects the temperature of the outdoor air before passing through the primary side heat exchanger 74, and the primary side discharge that detects the pressure of the primary side refrigerant discharged from the primary side compressor 71.
- a side suction temperature sensor 81 and a primary side heat exchange temperature sensor 82 for detecting the temperature of the refrigerant flowing through the primary side heat exchanger 74 are provided.
- the primary side control unit 70 controls the operation of each unit 71 (71a), 72, 75 (75a), 76, 104a provided in the primary side unit 5.
- the primary side control unit 70 has a processor such as a CPU or a microcomputer provided for controlling the primary side unit 5 and a memory, and has a control signal or the like between the remote controller (not shown). It is possible to exchange control signals and the like with the heat source side control unit 20 of the heat source unit 2, the branch unit control units 60a, 60b, 60c, and the user side control units 50a, 50b, 50c. It has become like.
- Heat source unit 2 is installed in a space different from the space in which the utilization units 3a, 3b, 3c and the branch units 6a, 6b, 6c are arranged, a rooftop, or the like.
- the heat source unit 2 is connected to the branch units 6a, 6b, 6c via the connecting pipes 7, 8 and 9, and constitutes a part of the secondary side refrigerant circuit 10. Further, the heat source unit 2 is connected to the primary side unit 5 via the primary side first connecting pipe 111 and the primary side second connecting pipe 112, and constitutes a part of the primary side refrigerant circuit 5a.
- the heat source unit 2 mainly includes the above-mentioned heat source circuit 12, various sensors, a heat source side control unit 20, a second liquid closing valve 106 constituting a part of the primary side refrigerant circuit 5a, a first connection pipe 115, and a primary.
- connection point between the third connection pipe 114 and the primary side receiver 101 may be lower than the center in the height direction of the primary side receiver 101. Further, the connection point between the third connection pipe 114 and the primary side flow path 35b of the cascade heat exchanger 35 may be lower than the center in the height direction of the cascade heat exchanger 35. This facilitates the connection between the primary side receiver 101 and the cascade heat exchanger 35.
- the heat source unit 2 includes a secondary side suction pressure sensor 37 that detects the pressure of the secondary side refrigerant on the suction side of the secondary side compressor 21, and a secondary side refrigerant on the discharge side of the secondary side compressor 21.
- the secondary side discharge pressure sensor 38 that detects the pressure of the secondary side
- the secondary side discharge temperature sensor 39 that detects the temperature of the secondary side refrigerant on the discharge side of the secondary side compressor 21, and the secondary side compressor 21.
- the secondary side refrigerant flowing between the secondary side suction temperature sensor 88 that detects the temperature of the secondary side refrigerant on the suction side, the secondary side flow path 35a of the cascade heat exchanger 35, and the heat source side expansion valve 36.
- a bypass circuit temperature sensor 85 that detects the temperature of the secondary side refrigerant flowing downstream of the bypass expansion valve 46a in the bypass circuit 46, the secondary side overcooling heat exchanger 47, and the third closing valve 31.
- the temperature of the secondary side refrigerant flowing through the outlet of the supercooling outlet temperature sensor 86 that detects the temperature of the flowing secondary side refrigerant and the secondary side supercooling heat exchanger 47 in the secondary side supercooling circuit 48 is detected.
- a supercooling circuit temperature sensor 87 is provided.
- the heat source side control unit 20 controls the operation of each unit 21 (21a), 22, 36, 44, 46a, 48a, 102 provided inside the heat source casing 2x of the heat source unit 2.
- the heat source side control unit 20 controls the valve opening degree of the primary side second expansion valve 102, which is a component constituting a part of the primary side refrigerant circuit 5a, not the secondary side refrigerant circuit 10.
- the heat source side control unit 20 has a processor and memory such as a CPU and a microcomputer provided for controlling the heat source unit 2, and includes the primary side control unit 70 of the primary side unit 5 and the utilization units 3a and 3b. Control signals and the like can be exchanged with the user-side control units 50a, 50b, 50c of 3c and the branch unit control units 60a, 60b, 60c.
- Utilization unit 3a, 3b, and 3c are installed in the ceiling of a building or the like by embedding or hanging them, or by hanging them on the wall surface of the room.
- the utilization units 3a, 3b, and 3c are connected to the heat source unit 2 via the connecting pipes 7, 8, and 9.
- the utilization units 3a, 3b, and 3c have utilization circuits 13a, 13b, and 13c that form a part of the secondary side refrigerant circuit 10.
- the configurations of the usage units 3a, 3b, and 3c will be described. Since the second utilization unit 3b and the third utilization unit 3c have the same configuration as the first utilization unit 3a, only the configuration of the first utilization unit 3a will be described here, and the second utilization unit 3b and the third utilization unit 3b will be described. Regarding the configuration of the utilization unit 3c, the subscript "b" or “c” is added instead of the subscript "a" of the code indicating each part of the first utilization unit 3a, and the description of each part is omitted.
- the first utilization unit 3a mainly has the above-mentioned utilization circuit 13a, an indoor fan 53a, a utilization side control unit 50a, and various sensors.
- the indoor fan 53a has an indoor fan motor 54a.
- the indoor fan 53a sucks indoor air into the unit, exchanges heat with the refrigerant flowing through the user-side heat exchanger 52a, and then generates an air flow to be supplied to the room as supply air.
- the indoor fan 53a is driven by the indoor fan motor 54a.
- the utilization unit 3a is provided with a liquid side temperature sensor 58a that detects the temperature of the refrigerant on the liquid side of the utilization side heat exchanger 52a. Further, the utilization unit 3a is provided with an indoor temperature sensor 55a that detects the indoor temperature, which is the temperature of the air taken in from the room and before passing through the utilization side heat exchanger 52a.
- the user-side control unit 50a controls the operations of the units 51a and 53a (54a) constituting the utilization unit 3a.
- the user-side control unit 50a has a processor such as a CPU or a microcomputer provided for controlling the user unit 3a and a memory, and controls signals or the like between the remote controller (not shown). It is possible to exchange control signals and the like with the heat source side control unit 20 of the heat source unit 2, the branch unit control units 60a, 60b, 60c, and the primary side control unit 70 of the primary side unit 5. It has become like.
- the second utilization unit 3b has a utilization circuit 13b, an indoor fan 53b, a utilization side control unit 50b, and an indoor fan motor 54b.
- the third utilization unit 3c includes a utilization circuit 13c, an indoor fan 53c, a utilization side control unit 50c, and an indoor fan motor 54c.
- Branch unit 6a, 6b, and 6c are installed in a space behind the ceiling in a building or the like.
- the branch units 6a, 6b, 6c are connected to the utilization units 3a, 3b, and 3c in a one-to-one correspondence.
- the branch units 6a, 6b, 6c are connected to the heat source unit 2 via the connecting pipes 7, 8 and 9.
- the configurations of the branch units 6a, 6b, and 6c will be described. Since the second branch unit 6b and the third branch unit 6c have the same configuration as the first branch unit 6a, only the configuration of the first branch unit 6a will be described here, and the second branch unit 6b and the third branch unit 6b and the third branch unit 6b will be described. Regarding the configuration of the branch unit 6c, the subscript "b" or “c” is added instead of the subscript "a" of the code indicating each part of the first branch unit 6a, and the description of each part is omitted.
- the first branch unit 6a mainly has the above-mentioned branch circuit 14a and the branch unit control unit 60a.
- the branch unit control unit 60a controls the operations of the units 66a and 67a constituting the branch unit 6a.
- the branch unit control unit 60a has a processor such as a CPU or a microcomputer provided for controlling the branch unit 6a and a memory, and controls signals or the like between the remote controller (not shown). It is possible to exchange control signals and the like with the heat source side control unit 20 of the heat source unit 2, the utilization units 3a, 3b, 3c, and the primary side control unit 70 of the primary side unit 5. It has become.
- the second branch unit 6b has a branch circuit 14b and a branch unit control unit 60b.
- the third branch unit 6c has a branch circuit 14c and a branch unit control unit 60c.
- Control unit 80 In the refrigeration cycle system 1, the heat source side control unit 20, the user side control unit 50a, 50b, 50c, the branch unit control unit 60a, 60b, 60c, and the primary side control unit 70 are wired or wireless.
- the control unit 80 is configured by being connected to each other so as to be communicable with each other. Therefore, this control unit 80 includes detection information of various sensors 37, 38, 39, 83, 84, 85, 86, 87, 88, 77, 78, 79, 81, 82, 58a, 58b, 58c and the like and is not shown.
- the refrigeration cycle operation of the refrigeration cycle system 1 can be mainly divided into a cooling operation, a heating operation, a cooling-based operation, and a heating-based operation.
- the utilization side heat exchanger functions as an evaporator of the refrigerant
- the cascade heat exchanger 35 is used as the secondary side refrigerant with respect to the evaporation load of the entire utilization unit. It is a refrigeration cycle operation that functions as a radiator.
- the utilization side heat exchanger functions as a refrigerant radiator
- the cascade heat exchanger 35 is used as a secondary side refrigerant evaporator for the heat dissipation load of the entire utilization unit. It is a refrigeration cycle operation that functions as.
- Cooling-based operation is an operation in which a utilization unit in which the user-side heat exchanger functions as a refrigerant evaporator and a utilization unit in which the user-side heat exchanger functions as a refrigerant radiator are mixed. be.
- the cascade heat exchanger 35 functions as a radiator of the refrigerant on the secondary side with respect to the evaporation load of the entire utilization unit. It is a cycle operation.
- the heating-based operation is an operation in which a utilization unit in which the user-side heat exchanger functions as a refrigerant evaporator and a utilization unit in which the user-side heat exchanger functions as a refrigerant radiator are mixed. be.
- the heating main operation when the heat dissipation load is the main heat load of the entire utilization unit, the cascade heat exchanger 35 functions as an evaporator of the refrigerant on the secondary side with respect to the heat dissipation load of the entire utilization unit. It is a cycle operation.
- the operation of the refrigeration cycle system 1 including these refrigeration cycle operations is performed by the above-mentioned control unit 80.
- Cooling operation for example, all of the heat exchangers 52a, 52b, 52c on the user side of the utilization units 3a, 3b, and 3c function as refrigerant evaporators, and the cascade heat exchanger 35 is operated. Operates to function as a radiator for the refrigerant on the secondary side.
- the primary side refrigerant circuit 5a and the secondary side refrigerant circuit 10 of the refrigeration cycle system 1 are configured as shown in FIG.
- the arrow attached to the primary side refrigerant circuit 5a and the arrow attached to the secondary side refrigerant circuit 10 in FIG. 3 indicate the flow of the refrigerant during the cooling operation.
- the cascade heat exchanger 35 is made to function as an evaporator of the refrigerant on the primary side by switching the primary side switching mechanism 72 to the fifth connection state.
- the fifth connection state of the primary side switching mechanism 72 is the connection state shown by the solid line in the primary side switching mechanism 72 of FIG.
- the condensed primary side refrigerant in the primary side heat exchanger 74 passes through the primary side first expansion valve 76 controlled to the fully open state, and a part of the refrigerant passes through the primary side supercooling heat exchanger 103 to the first liquid. It flows toward the shutoff valve 108, and some other refrigerant branches to the primary side supercooling circuit 104 and flows.
- the refrigerant flowing through the primary side supercooling circuit 104 is depressurized as it passes through the primary side supercooling expansion valve 104a.
- the refrigerant flowing from the primary side first expansion valve 76 toward the first liquid closing valve 108 is decompressed by the primary side supercooling expansion valve 104a in the primary side supercooling heat exchanger 103 and flows through the primary side supercooling circuit 104. It exchanges heat with the refrigerant and is cooled until it becomes supercooled.
- the supercooled refrigerant flows in the order of the primary side first connecting pipe 111, the second liquid closing valve 106, and the first connecting pipe 115, and flows into the primary side receiver 101. In the primary side receiver 101, the liquid refrigerant surplus in the refrigeration cycle in the primary side refrigerant circuit 5a is stored.
- the refrigerant flowing out from the primary side receiver 101 to the third connection pipe 114 is depressurized in the primary side second expansion valve 102.
- the valve opening degree of the primary side second expansion valve 102 is controlled so that the degree of superheat of the refrigerant sucked into the primary side compressor 71 becomes a predetermined value, for example.
- the refrigerant on the primary side decompressed by the secondary expansion valve 102 on the primary side exchanges heat with the refrigerant on the secondary side flowing through the secondary side flow path 35a when flowing through the primary side flow path 35b of the cascade heat exchanger 35. As a result, it evaporates and flows toward the second gas closing valve 107 through the second connecting pipe 113.
- the refrigerant that has passed through the second gas closing valve 107 reaches the primary side switching mechanism 72 after passing through the primary side second connecting pipe 112 and the first gas closing valve 109.
- the refrigerant that has passed through the primary side switching mechanism 72 merges with the refrigerant that has flowed through the primary side supercooling circuit 104, and then is sucked into the primary side compressor 71 via the primary side accumulator 105.
- the cascade heat exchanger 35 is made to function as a radiator of the refrigerant on the secondary side by switching the secondary side switching mechanism 22 to the first connection state and the fourth connection state. ing.
- the first connection state of the secondary side switching mechanism 22 is a connection state in which the first switching valve 22a is in the open state and the third switching valve 22c is in the closed state.
- the fourth connection state of the secondary side switching mechanism 22 is a connection state in which the fourth switching valve 22d is in the open state and the second switching valve 22b is in the closed state.
- the opening degree of the heat source side expansion valve 36 is adjusted.
- the first control valves 66a, 66b, 66c and the second control valves 67a, 67b, 67c are controlled to be in the open state.
- all of the user-side heat exchangers 52a, 52b, and 52c of the utilization units 3a, 3b, and 3c function as refrigerant evaporators.
- all of the heat exchangers 52a, 52b and 52c on the side of use of the use units 3a, 3b and 3c and the suction side of the secondary side compressor 21 of the heat source unit 2 are the first use pipes 57a, 57b, 57c and the first.
- the high pressure refrigerant on the secondary side compressed and discharged by the secondary side compressor 21 is passed through the secondary side switching mechanism 22 to the secondary side flow path of the cascade heat exchanger 35. It is sent to 35a.
- the high pressure refrigerant on the secondary side flowing through the secondary side flow path 35a dissipates heat, and the primary side refrigerant flowing through the primary side flow path 35b of the cascade heat exchanger 35 evaporates.
- the secondary-side refrigerant radiated from the cascade heat exchanger 35 passes through the heat source-side expansion valve 36 whose opening degree is adjusted, and then flows into the secondary-side receiver 45.
- the secondary side supercooling heat exchanger 47 the other part of the refrigerant flowing out from the secondary side receiver 45 is cooled by the refrigerant flowing through the secondary side supercooling circuit 48, and then through the third closing valve 31. It is sent to the secondary side third connecting pipe 7.
- the refrigerant sent to the secondary side third connecting pipe 7 is branched into three and passes through the third branch pipes 61a, 61b, 61c of the first to third branch units 6a, 6b, 6c, respectively. ..
- the refrigerant flowing through the second connection pipes 16a, 16b, 16c is sent to the second utilization pipes 56a, 56b, 56c of the first to third utilization units 3a, 3b, 3c, respectively.
- the refrigerant sent to the second utilization pipes 56a, 56b, 56c is sent to the utilization side expansion valves 51a, 51b, 51c of the utilization units 3a, 3b, 3c.
- the refrigerant that has passed through the utilization-side expansion valves 51a, 51b, 51c whose opening degree is adjusted is the indoor air and heat supplied by the indoor fans 53a, 53b, 53c in the utilization-side heat exchangers 52a, 52b, 52c. Make an exchange. As a result, the refrigerant flowing through the heat exchangers 52a, 52b, and 52c on the user side evaporates and becomes a low-pressure gas refrigerant. The indoor air is cooled and supplied to the room. As a result, the indoor space is cooled.
- the low-pressure gas refrigerant evaporated in the user-side heat exchangers 52a, 52b, 52c flows through the first utilization pipes 57a, 57b, 57c, flows through the first connection pipes 15a, 15b, 15c, and then flows through the first to third pipes. It is sent to the merging pipes 62a, 62b, 62c of the branch units 6a, 6b, 6c.
- the low-pressure gas refrigerant sent to the merging pipes 62a, 62b, 62c branches into the first branch pipes 63a, 63b, 63c and the second branch pipes 64a, 64b, 64c and flows.
- the refrigerant that has passed through the first control valves 66a, 66b, 66c in the first branch pipes 63a, 63b, 63c is sent to the secondary side first connecting pipe 8.
- the refrigerant that has passed through the second control valves 67a, 67b, 67c in the second branch pipes 64a, 64b, 64c is sent to the secondary side second connecting pipe 9.
- the low-pressure gas refrigerant sent to the secondary side first connecting pipe 8 and the secondary side second connecting pipe 9 is the first closing valve 32, the second closing valve 33, the first heat source pipe 28, and the second heat source. It is returned to the suction side of the secondary side compressor 21 through the pipe 29, the secondary side switching mechanism 22, the suction flow path 23, and the secondary side accumulator 30.
- the cascade heat exchanger 35 is made to function as a radiator of the refrigerant on the primary side by switching the primary side switching mechanism 72 to the sixth operating state.
- the sixth operating state of the primary side switching mechanism 72 is the connection state shown by the broken line in the primary side switching mechanism 72 of FIG.
- the refrigerant flowing through the primary side flow path 35b of the cascade heat exchanger 35 is condensed by exchanging heat with the secondary side refrigerant flowing through the secondary side flow path 35a.
- the refrigerant on the primary side condensed in the cascade heat exchanger 35 flows through the third connection pipe 114, it passes through the secondary expansion valve 102 on the primary side controlled to be fully open and flows into the primary receiver 101.
- the liquid refrigerant surplus in the refrigeration cycle in the primary side refrigerant circuit 5a is stored.
- the refrigerant flowing out from the primary side receiver 101 flows in the order of the first connection pipe 115, the second liquid closing valve 106, the primary side first connecting pipe 111, the first liquid closing valve 108, and the primary side supercooling heat exchanger 103. , The pressure is reduced in the primary side first expansion valve 76.
- the primary side supercooling expansion valve 104a is controlled to be in a closed state, so that the refrigerant does not flow through the primary side supercooling circuit 104, so that heat exchange is also performed in the primary side supercooling heat exchanger 103. I won't get it.
- the valve opening degree of the primary side first expansion valve 76 is controlled so that the degree of superheat of the refrigerant sucked into the primary side compressor 71 becomes a predetermined value, for example.
- the refrigerant decompressed in the primary side first expansion valve 76 evaporates by exchanging heat with the outside air supplied from the primary side fan 75 in the primary side heat exchanger 74, and evaporates, and the primary side switching mechanism 72 and the primary side accumulator 105. Is sucked into the primary side compressor 71.
- the secondary side switching mechanism 22 is switched to the second connection state and the third connection state.
- the cascade heat exchanger 35 is made to function as an evaporator of the refrigerant on the secondary side.
- the second connection state of the secondary side switching mechanism 22 is a connection state in which the first switching valve 22a is in the closed state and the third switching valve 22c is in the open state.
- the third connection state of the secondary side switching mechanism 22 is a connection state in which the second switching valve 22b is in the open state and the fourth switching valve 22d is in the closed state. Further, the opening degree of the heat source side expansion valve 36 is adjusted.
- the first control valves 66a, 66b, 66c are controlled to be in the open state, and the second control valves 67a, 67b, 67c are controlled to be in the closed state.
- all of the user-side heat exchangers 52a, 52b, and 52c of the utilization units 3a, 3b, and 3c function as refrigerant radiators.
- the utilization side heat exchangers 52a, 52b, 52c of the utilization units 3a, 3b and 3c and the discharge side of the secondary side compressor 21 of the heat source unit 2 are the discharge flow path 24, the first heat source pipe 28, and the secondary.
- the first branch pipe 63a, 63b, 63c the merging pipe 62a, 62b, 62c, the first connecting pipe 15a, 15b, 15c, and the first utilization pipe 57a, 57b, 57c. It is in a state. Further, the secondary supercooling expansion valve 48a and the bypass expansion valve 46a are controlled to be closed. In the utilization units 3a, 3b, and 3c, the opening degrees of the utilization side expansion valves 51a, 51b, and 51c are adjusted.
- the high-pressure refrigerant compressed and discharged by the secondary side compressor 21 is a first heat source through the second switching valve 22b controlled to be in the open state by the secondary side switching mechanism 22. It is sent to the pipe 28.
- the refrigerant sent to the first heat source pipe 28 is sent to the secondary side first connecting pipe 8 through the first closing valve 32.
- the high-pressure refrigerant sent to the secondary side first connecting pipe 8 is branched into three, and the first branch pipes 63a, 63b, 63c of each utilization unit 3a, 3b, 3c which are the utilization units during operation are branched. Will be sent to.
- the high-pressure refrigerant sent to the first branch pipes 63a, 63b, 63c passes through the first control valves 66a, 66b, 66c and flows through the merging pipes 62a, 62b, 62c. After that, the refrigerant flowing through the first connecting pipes 15a, 15b, 15c and the first utilization pipes 57a, 57b, 57c is sent to the utilization side heat exchangers 52a, 52b, 52c.
- the high-pressure refrigerant sent to the user-side heat exchangers 52a, 52b, 52c exchanges heat with the indoor air supplied by the indoor fans 53a, 53b, 53c in the user-side heat exchangers 52a, 52b, 52c. ..
- the refrigerant flowing through the user-side heat exchangers 52a, 52b, and 52c dissipates heat.
- the indoor air is heated and supplied into the room. This heats the interior space.
- the refrigerant dissipated in the user-side heat exchangers 52a, 52b, 52c flows through the second utilization pipes 56a, 56b, 56c and passes through the utilization-side expansion valves 51a, 51b, 51c whose opening degree is adjusted.
- the refrigerant flowing through the second connecting pipes 16a, 16b, 16c flows through the third branch pipes 61a, 61b, 61c of the branch units 6a, 6b, 6c.
- the refrigerant sent to the third branch pipes 61a, 61b, 61c is sent to the secondary side third connecting pipe 7 and merges.
- the refrigerant sent to the secondary side third connecting pipe 7 is sent to the heat source side expansion valve 36 through the third closing valve 31.
- the refrigerant sent to the heat source side expansion valve 36 is sent to the cascade heat exchanger 35 after the flow rate is adjusted in the heat source side expansion valve 36.
- the refrigerant on the secondary side flowing through the secondary side flow path 35a evaporates to become a low-pressure gas refrigerant and is sent to the secondary side switching mechanism 22 to flow to the primary side of the cascade heat exchanger 35.
- the refrigerant on the primary side flowing through the path 35b condenses.
- the low-pressure gas refrigerant on the secondary side sent to the secondary side switching mechanism 22 is returned to the suction side of the secondary side compressor 21 through the suction flow path 23 and the secondary side accumulator 30.
- Cooling-based operation for example, the utilization-side heat exchangers 52a and 52b of the utilization units 3a and 3b function as refrigerant evaporators, and the utilization-side heat exchanger 52c of the utilization unit 3c Operates to function as a refrigerant radiator.
- the cascade heat exchanger 35 functions as a radiator for the refrigerant on the secondary side.
- the primary side refrigerant circuit 5a and the secondary side refrigerant circuit 10 of the refrigeration cycle system 1 are configured as shown in FIG.
- the arrow attached to the primary side refrigerant circuit 5a and the arrow attached to the secondary side refrigerant circuit 10 in FIG. 5 indicate the flow of the refrigerant during the cooling main operation.
- the cascade heat exchanger 35 is switched by switching the primary side switching mechanism 72 to the fifth connection state (the state shown by the solid line of the primary side switching mechanism 72 in FIG. 5). It is designed to function as an evaporator for the refrigerant on the primary side.
- the refrigerant on the primary side discharged from the primary side compressor 71 passes through the primary side switching mechanism 72 and is supplied from the primary side fan 75 in the primary side heat exchanger 74. Condenses by exchanging heat with.
- the condensed primary side refrigerant in the primary side heat exchanger 74 passes through the primary side first expansion valve 76 controlled to the fully open state, and a part of the refrigerant passes through the primary side supercooling heat exchanger 103 to the first liquid. It flows toward the shutoff valve 108, and some other refrigerant branches to the primary side supercooling circuit 104 and flows.
- the refrigerant flowing through the primary side supercooling circuit 104 is depressurized as it passes through the primary side supercooling expansion valve 104a.
- the refrigerant flowing from the primary side first expansion valve 76 toward the first liquid closing valve 108 is decompressed by the primary side supercooling expansion valve 104a in the primary side supercooling heat exchanger 103 and flows through the primary side supercooling circuit 104. It exchanges heat with the refrigerant and is cooled until it becomes supercooled.
- the supercooled refrigerant flows in the order of the primary side first connecting pipe 111, the second liquid closing valve 106, and the first connecting pipe 115, and flows into the primary side receiver 101. In the primary side receiver 101, the liquid refrigerant surplus in the refrigeration cycle in the primary side refrigerant circuit 5a is stored.
- the refrigerant flowing out from the primary side receiver 101 to the third connection pipe 114 is depressurized in the primary side second expansion valve 102.
- the valve opening degree of the primary side second expansion valve 102 is controlled so that the degree of superheat of the refrigerant sucked into the primary side compressor 71 becomes a predetermined value, for example.
- the refrigerant on the primary side decompressed by the secondary expansion valve 102 on the primary side exchanges heat with the refrigerant on the secondary side flowing through the secondary side flow path 35a when flowing through the primary side flow path 35b of the cascade heat exchanger 35. As a result, it evaporates and flows toward the second gas closing valve 107 through the second connecting pipe 113.
- the refrigerant that has passed through the second gas closing valve 107 reaches the primary side switching mechanism 72 after passing through the primary side second connecting pipe 112 and the first gas closing valve 109.
- the refrigerant that has passed through the primary side switching mechanism 72 merges with the refrigerant that has flowed through the primary side supercooling circuit 104, and then is sucked into the primary side compressor 71 via the primary side accumulator 105.
- the secondary side switching mechanism 22 is connected in the first connection state (the first switching valve 22a is in the open state and the third switching valve 22c is in the closed state) and in the third connection state (second switching valve 22b).
- the cascade heat exchanger 35 is made to function as a radiator of the refrigerant on the secondary side.
- the opening degree of the heat source side expansion valve 36 is adjusted.
- the first control valve 66c and the second control valves 67a, 67b are controlled to be open, and the first control valves 66a, 66b, and the first 2 The control valve 67c is controlled to be closed.
- the utilization side heat exchangers 52a and 52b of the utilization units 3a and 3b function as the refrigerant evaporator
- the utilization side heat exchanger 52c of the utilization unit 3c functions as the refrigerant radiator.
- the utilization side heat exchangers 52a and 52b of the utilization units 3a and 3b and the suction side of the secondary side compressor 21 of the heat source unit 2 are connected to each other via the secondary side second connecting pipe 9.
- the user-side heat exchanger 52c of the utilization unit 3c and the discharge side of the secondary side compressor 21 of the heat source unit 2 are connected to each other via the secondary side first connecting pipe 8.
- the degree of supercooling of the secondary side refrigerant flowing from the outlet of the secondary side supercooling heat exchanger 47 toward the secondary side third connecting pipe 7 becomes a predetermined value.
- the opening degree is controlled so as to be.
- the bypass expansion valve 46a is controlled to be closed.
- the opening degrees of the utilization side expansion valves 51a, 51b, and 51c are adjusted.
- a part of the secondary side high-pressure refrigerant compressed and discharged by the secondary side compressor 21 is the secondary side switching mechanism 22, the first heat source pipe 28, and the second. 1 It is sent to the secondary side first connecting pipe 8 through the closing valve 32, and the rest is sent to the secondary side flow path 35a of the cascade heat exchanger 35 through the secondary side switching mechanism 22 and the third heat source pipe 25. ..
- the high-pressure refrigerant sent to the secondary side first connecting pipe 8 is sent to the first branch pipe 63c.
- the high-pressure refrigerant sent to the first branch pipe 63c is sent to the user side heat exchanger 52c of the utilization unit 3c through the first control valve 66c and the merging pipe 62c.
- the high-pressure refrigerant sent to the user-side heat exchanger 52c exchanges heat with the indoor air supplied by the indoor fan 53c in the user-side heat exchanger 52c.
- the refrigerant flowing through the heat exchanger 52c on the user side dissipates heat.
- the indoor air is heated and supplied into the room, and the heating operation of the utilization unit 3c is performed.
- the refrigerant dissipated in the user-side heat exchanger 52c flows through the second utilization pipe 56c, and the flow rate is adjusted in the utilization-side expansion valve 51c. After that, the refrigerant flowing through the second connecting pipe 16c is sent to the third branch pipe 61c of the branch unit 6c.
- the high-pressure refrigerant sent to the secondary side flow path 35a of the cascade heat exchanger 35 dissipates heat by exchanging heat with the primary side refrigerant flowing through the primary side flow path 35b in the cascade heat exchanger 35.
- the secondary side refrigerant radiated in the cascade heat exchanger 35 flows into the secondary side receiver 45 after the flow rate is adjusted in the heat source side expansion valve 36.
- a part of the refrigerant flowing out from the secondary side receiver 45 branches into the secondary side supercooling circuit 48, is depressurized by the secondary side supercooling expansion valve 48a, and then joins the suction flow path 23.
- the other part of the refrigerant flowing out from the secondary side receiver 45 is cooled by the refrigerant flowing through the secondary side supercooling circuit 48, and then through the third closing valve 31. It is sent to the secondary side third connecting pipe 7 and merges with the radiated refrigerant in the user side heat exchanger 52c.
- the refrigerant merged in the secondary side third connecting pipe 7 is branched into two and sent to the third branch pipes 61a and 61b of the branch units 6a and 6b, respectively.
- the refrigerant flowing through the second connecting pipes 16a and 16b is sent to the second used pipes 56a and 56b of the first and second used units 3a and 3b, respectively.
- the refrigerant flowing through the second utilization pipes 56a and 56b passes through the utilization side expansion valves 51a and 51b of the utilization units 3a and 3b.
- the refrigerant that has passed through the utilization side expansion valves 51a and 51b whose opening degree is adjusted exchange heat with the indoor air supplied by the indoor fans 53a and 53b in the utilization side heat exchangers 52a and 52b.
- the refrigerant flowing through the heat exchangers 52a and 52b on the user side evaporates and becomes a low-pressure gas refrigerant.
- the indoor air is cooled and supplied to the room.
- the indoor space is cooled.
- the low-pressure gas refrigerant evaporated in the user-side heat exchangers 52a and 52b is sent to the merging pipes 62a and 62b of the first and second branch units 6a and 6b.
- the low-pressure gas refrigerant sent to the merging pipes 62a and 62b is sent to the secondary side second connecting pipe 9 through the second control valves 67a and 67b and the second branch pipes 64a and 64b and merges.
- the low-pressure gas refrigerant sent to the secondary side second connecting pipe 9 passes through the second closing valve 33, the second heat source pipe 29, the suction flow path 23, and the secondary side accumulator 30, and the secondary side compressor 21. It is returned to the suction side of.
- the utilization-side heat exchangers 52a and 52b of the utilization units 3a and 3b function as a refrigerant radiator, and the utilization-side heat exchanger 52c evaporates the refrigerant. Operate to function as a vessel.
- the cascade heat exchanger 35 functions as an evaporator of the refrigerant on the secondary side.
- the primary side refrigerant circuit 5a and the secondary side refrigerant circuit 10 of the refrigeration cycle system 1 are configured as shown in FIG.
- the arrow attached to the primary side refrigerant circuit 5a and the arrow attached to the secondary side refrigerant circuit 10 in FIG. 6 indicate the flow of the refrigerant during the heating main operation.
- the cascade heat exchanger 35 is made to function as a radiator of the refrigerant on the primary side by switching the primary side switching mechanism 72 to the sixth operating state.
- the sixth operating state of the primary side switching mechanism 72 is the connection state shown by the broken line in the primary side switching mechanism 72 of FIG.
- the refrigerant flowing through the primary side flow path 35b of the cascade heat exchanger 35 is condensed by exchanging heat with the secondary side refrigerant flowing through the secondary side flow path 35a.
- the refrigerant on the primary side condensed in the cascade heat exchanger 35 flows through the third connection pipe 114, it passes through the secondary expansion valve 102 on the primary side controlled to be fully open and flows into the primary receiver 101. It flows into the primary receiver 101.
- the liquid refrigerant surplus in the refrigeration cycle in the primary side refrigerant circuit 5a is stored.
- the refrigerant flowing out from the primary side receiver 101 flows in the order of the first connection pipe 115, the second liquid closing valve 106, the primary side first connecting pipe 111, the first liquid closing valve 108, and the primary side supercooling heat exchanger 103. , The pressure is reduced in the primary side first expansion valve 76. Since the primary side supercooling expansion valve 104a is controlled to be closed during the heating main operation, the refrigerant does not flow through the primary side supercooling circuit 104, so that the heat exchange in the primary side supercooling heat exchanger 103 is also possible. Not done.
- the valve opening degree of the primary side first expansion valve 76 is controlled so that the degree of superheat of the refrigerant sucked into the primary side compressor 71 becomes a predetermined value, for example.
- the refrigerant decompressed in the primary side first expansion valve 76 evaporates by exchanging heat with the outside air supplied from the primary side fan 75 in the primary side heat exchanger 74, and evaporates, and the primary side switching mechanism 72 and the primary side accumulator 105. Is sucked into the primary side compressor 71.
- the secondary side switching mechanism 22 is switched to the second connection state and the third connection state.
- the second connection state of the secondary side switching mechanism 22 is a connection state in which the first switching valve 22a is in the closed state and the third switching valve 22c is in the open state.
- the third connection state of the secondary side switching mechanism 22 is a connection state in which the second switching valve 22b is in the open state and the fourth switching valve 22d is in the closed state.
- the first control valve 66a, 66b and the second control valve 67c are controlled to be open, and the first control valve 66c and the second control valve 66c and the second control valve are controlled to be open.
- the valves 67a and 67b are controlled to be closed.
- the utilization side heat exchangers 52a and 52b of the utilization units 3a and 3b function as a refrigerant radiator, and the utilization side heat exchanger 52c of the utilization unit 3c functions as a refrigerant evaporator.
- the utilization side heat exchanger 52c of the utilization unit 3c and the suction side of the secondary side compressor 21 of the heat source unit 2 are the first utilization pipe 57c, the first connection pipe 15c, the merging pipe 62c, and the second branch pipe 64c. , And the state of being connected via the secondary side second connecting pipe 9. Further, the utilization side heat exchangers 52a and 52b of the utilization units 3a and 3b and the discharge side of the secondary side compressor 21 of the heat source unit 2 are connected to the discharge flow path 24, the first heat source pipe 28, and the secondary side first connection.
- the high pressure refrigerant on the secondary side compressed and discharged by the secondary side compressor 21 is passed through the secondary side switching mechanism 22, the first heat source pipe 28, and the first closing valve 32. , Is sent to the secondary side first connecting pipe 8.
- the high-pressure refrigerant sent to the secondary side first connecting pipe 8 is branched into two and connected to each of the first utilization unit 3a and the second utilization unit 3b, which are the utilization units in operation. It is sent to the first branch pipes 63a and 63b of the first branch unit 6a and the second branch unit 6b.
- the high-pressure refrigerant sent to the first branch pipes 63a and 63b passes through the first control valves 66a and 66b, the merging pipes 62a and 62b, and the first connection pipes 15a and 15b, and the first utilization unit 3a and the second utilization unit 3b. It is sent to the heat exchangers 52a and 52b on the user side.
- the high-pressure refrigerant sent to the user-side heat exchangers 52a and 52b exchanges heat with the indoor air supplied by the indoor fans 53a and 53b in the user-side heat exchangers 52a and 52b.
- the refrigerant flowing through the heat exchangers 52a and 52b on the user side dissipates heat.
- the indoor air is heated and supplied into the room. This heats the interior space.
- the refrigerant dissipated in the user-side heat exchangers 52a and 52b flows through the second utilization pipes 56a and 56b and passes through the utilization-side expansion valves 51a and 51b whose opening degree is adjusted.
- the refrigerant flowing through the second connecting pipes 16a and 16b is sent to the secondary side third connecting pipe 7 via the third branch pipes 61a and 61b of the branch units 6a and 6b.
- the refrigerant sent to the third branch pipe 61c flows through the second utilization pipe 56c of the utilization unit 3c via the second connection pipe 16c and is sent to the utilization side expansion valve 51c.
- the refrigerant that has passed through the utilization side expansion valve 51c whose opening degree is adjusted exchanges heat with the indoor air supplied by the indoor fan 53c in the utilization side heat exchanger 52c.
- the refrigerant flowing through the user-side heat exchanger 52c evaporates and becomes a low-pressure gas refrigerant.
- the indoor air is cooled and supplied to the room.
- the indoor space is cooled.
- the low-pressure gas refrigerant evaporated in the user-side heat exchanger 52c passes through the first utilization pipe 57c and the first connection pipe 15c, and is sent to the merging pipe 62c.
- the low-pressure gas refrigerant sent to the merging pipe 62c is sent to the secondary side second connecting pipe 9 through the second control valve 67c and the second branch pipe 64c.
- the low-pressure gas refrigerant sent to the secondary side second connecting pipe 9 passes through the second closing valve 33, the second heat source pipe 29, the suction flow path 23, and the secondary side accumulator 30, and the secondary side compressor 21. It is returned to the suction side of.
- the refrigerant sent to the heat source side expansion valve 36 passes through the heat source side expansion valve 36 whose opening degree is adjusted, and then passes through the primary side flow path 35b in the secondary side flow path 35a of the cascade heat exchanger 35. It exchanges heat with the flowing primary refrigerant.
- the refrigerant flowing through the secondary side flow path 35a of the cascade heat exchanger 35 evaporates to become a low-pressure gas refrigerant, which is sent to the secondary side switching mechanism 22.
- the low-pressure gas refrigerant sent to the secondary side switching mechanism 22 merges with the low-pressure gas refrigerant evaporated in the user-side heat exchanger 52c in the suction flow path 23.
- the combined refrigerant is returned to the suction side of the secondary side compressor 21 via the secondary side accumulator 30.
- FIG. 7 shows a schematic external view showing how the primary side unit 5 and the heat source unit 2 are connected.
- the primary side unit 5 has a substantially rectangular parallelepiped primary side casing 5x having a plurality of surfaces. Inside the primary side casing 5x, as a part of the primary side refrigerant circuit 5a, a primary side compressor 71, a primary side switching mechanism 72, a primary side heat exchanger 74, and a primary side first expansion valve 76 are provided inside the primary side casing 5x. , Primary side supercooling heat exchanger 103, primary side supercooling circuit 104, primary side supercooling expansion valve 104a, first liquid closing valve 108, first gas closing valve 109, primary side accumulator 105, Is housed. A primary side first connecting pipe 111 and a primary side second connecting pipe 112, which are a part of the primary side refrigerant circuit 5a, extend from the primary side casing 5x.
- the heat source unit 2 has a heat source casing 2x having a substantially rectangular parallelepiped shape.
- a part of the secondary side refrigerant circuit 10 and a part of the primary side refrigerant circuit 5a are housed in the heat source casing 2x.
- a part of the secondary side refrigerant circuit 10 accommodated in the heat source casing 2x includes a secondary side accumulator 21, a secondary side switching mechanism 22, a first heat source pipe 28, a second heat source pipe 29, and a suction flow path. 23, a discharge flow path 24, a third heat source pipe 25, a fourth heat source pipe 26, a fifth heat source pipe 27, a cascade heat exchanger 35, a heat source side expansion valve 36, and a third closing valve 31.
- a heat source circuit 12 having a secondary side supercooling heat exchanger 47, a secondary side supercooling circuit 48, and a secondary side supercooling expansion valve 48a.
- a part of the primary side refrigerant circuit 5a accommodated in the heat source casing 2x includes a second liquid closing valve 106, a first connection pipe 115, a primary side receiver 101, a third connection pipe 114, and a primary side second expansion valve. 102, a cascade heat exchanger 35, a second connection pipe 113, and a second gas shutoff valve 107.
- a secondary side third connecting pipe 7, a secondary side first connecting pipe 8, and a secondary side second connecting pipe 9, which are a part of the secondary side refrigerant circuit 10, extend from the heat source casing 2x.
- a primary side first connecting pipe 111 and a primary side second connecting pipe 112, which are a part of the primary side refrigerant circuit 5a, extend from the heat source casing 2x.
- the heat source casing 2x is configured to have a plurality of surfaces including a top surface 120b, a first side surface 120a, a second side surface 120c, a bottom surface 120d, and a third side surface and a fourth side surface (not shown).
- the first side surface 120a is provided with an opening 120x (corresponding to an opening through which the first pipe and the second pipe pass).
- the primary side first connecting pipe 111 and the primary side second connecting pipe 112 pass through the opening 120x.
- Both the cascade heat exchanger 35 and the primary receiver 101 are mounted on the bottom surface 120d.
- the primary side receiver 101 of the primary side refrigerant circuit 5a is provided not in the primary side unit 5 but in the heat source unit 2. Therefore, when the refrigeration cycle system 1 is configured by using a primary side unit 5 filled with a relatively large amount of the primary side refrigerant, the primary side refrigerant tends to be surplus in the primary side refrigerant circuit 5a. Even so, the surplus can be stored in the primary receiver 101. This makes it possible to suppress a decrease in the capacity of the primary side refrigerant circuit 5a due to the surplus refrigerant.
- the dual refrigeration cycle is not performed, but a heat source unit having a compressor and a heat source side heat exchanger and a utilization unit having a user side heat exchanger.
- a heat source unit having a compressor and a heat source side heat exchanger and a utilization unit having a user side heat exchanger.
- a heat source unit used in such a unified refrigeration cycle there is a heat source unit filled with a sufficient amount of refrigerant in advance in order to form a central refrigeration cycle system by being connected to a connecting pipe at a construction site.
- a dual refrigeration cycle heat source unit pre-filled with such a refrigerant is provided with a plate heat exchanger type having a relatively small internal volume as a cascade heat exchanger without adjusting the amount of the pre-filled refrigerant.
- the refrigerant in the primary side refrigerant circuit tends to be excessive.
- the distance between the heat source unit 2 and the primary side unit 5 of the present embodiment is shorter than the distance between the heat source unit and the utilization unit in the primary refrigeration cycle, the primary side refrigerant in the dual refrigeration cycle after diversion Excess refrigerant tends to be noticeable in circuits.
- the heat source unit which has a supercooling heat exchanger as a heat source unit in the unified refrigeration cycle and is used to supercool the refrigerant and convey it to each utilization unit is further subjected to dual refrigeration after diversion.
- Excess refrigerant tends to be noticeable in the primary side refrigerant circuit of the cycle.
- a unit that does not have a receiver does not have a place for the surplus refrigerant when a surplus of refrigerant occurs in the primary side refrigerant circuit of the dual refrigeration cycle after diversion. Therefore, the generated excess refrigerant may accumulate in the heat exchanger or the like, resulting in poor operating efficiency.
- the heat source unit 2 to be connected to the primary side unit 5 includes the primary side receiver 101.
- the heat source unit of the primary refrigeration cycle is diverted as the primary side unit 5 of the dual refrigeration cycle without adjusting the amount of the pre-filled refrigerant to configure the refrigeration cycle system 1.
- the surplus refrigerant in the primary receiver 101 by storing the surplus refrigerant in the primary receiver 101, deterioration of operating efficiency can be suppressed.
- the primary side receiver 101 and the cascade heat exchanger 35 are provided in the heat source unit 2, a part of the primary side refrigerant circuit 5a is compact in the heat source unit 2. Can be accommodated in.
- both the primary side first connecting pipe 111 and the primary side second connecting pipe 112 extending from the heat source unit 2 for connecting to the primary side unit 5 extend from the first side surface 120a of the heat source casing 2x. It is out.
- the second gas closing valve 107 and the second liquid closing valve 106 which are the connection destinations of the primary side first connecting pipe 111 and the primary side second connecting pipe 112, are both openings provided on the first side surface 120a. It is located near 120x. Therefore, since the connection work at the time of construction can be performed from the first side surface 120a side of the heat source casing 2x, the workability is high.
- the heat source unit 2 is provided with a primary side second expansion valve 102 between the primary side flow path 35b of the cascade heat exchanger 35 and the primary side receiver 101, and has an opening degree during cooling operation and cooling main operation. By squeezing, it is possible to store a larger amount of liquid refrigerant in the primary side receiver 101.
- the global warming potential can be suppressed to a low level. Further, even if the refrigerant leaks on the user side, the fluorocarbon does not flow out on the user side because the refrigerant does not contain chlorofluorocarbons.
- the receiver unit 130 has a receiver casing 130x (corresponding to a third casing) that houses the primary side receiver 101 inside.
- the receiver casing 130x has a top surface 131b, a first side surface 131a, a second side surface 131c, a bottom surface 131d, and a third side surface and a fourth side surface (not shown).
- An opening 131x is formed on the first side surface 131a.
- the primary receiver 101 is mounted on the bottom surface 131d.
- the fourth connection pipe 114a, the fourth liquid closing valve 116, the fifth connection pipe 114b, and the third liquid closing valve 117 Has a sixth connection pipe 114c.
- the fourth connection pipe 114a connects the liquid side of the primary side flow path 35b of the cascade heat exchanger 35 and the fourth liquid closing valve 116.
- the second expansion valve 102 on the primary side is provided in the fourth connection pipe 114a.
- the fourth connection pipe 114a, the primary side second expansion valve 102, and the fourth liquid closing valve 116 are all provided in the heat source unit 2.
- the fourth liquid closing valve 116 is located in the vicinity of the opening 120x provided on the first side surface 120a of the heat source casing 2x.
- the fifth connection pipe 114b connects the fourth liquid closing valve 116 in the heat source casing 2x and the third liquid closing valve 117 in the receiver casing 130x.
- the third liquid closing valve 117, the sixth connecting pipe 114c, the primary side receiver 101, the first connecting pipe 115, and the second liquid closing valve 106 are provided in the receiver unit 130.
- the third liquid closing valve 117 and the second liquid closing valve 106 are located in the vicinity of the opening 131x provided on the first side surface 131a of the receiver casing 130x.
- the sixth connection pipe 114c connects the third liquid closing valve 117 and the primary side receiver 101.
- the first connection pipe 115 connects the primary side receiver 101 and the second liquid closing valve 106.
- the device used as the heat source unit in the unified refrigeration cycle system can be diverted as the primary side unit 5. Further, since the heat source unit 2 does not include the primary side receiver 101, the heat source unit 2 can be made compact. Further, since the connection work of the receiver unit 130 can be performed from the same side surface side, the workability is high.
- the heat source casing 2x and the receiver casing 130x may be integrated.
- the cascade heat exchanger 35 may be provided in another casing provided outside the heat source casing 2x of the heat source unit 2.
- the casing provided with the cascade heat exchanger 35 and the heat source casing 2x of the heat source unit 2 may be integrated.
- the heat source casing 2x may be provided with an opening for passing the primary side first connecting pipe 111 and an opening for passing the primary side second connecting pipe 112, respectively. Even in this case, the connection work can be facilitated by providing each opening on one of the plurality of surfaces of the heat source casing 2x.
- R32 is exemplified as the refrigerant used in the primary side refrigerant circuit 5a
- carbon dioxide is exemplified as the refrigerant used in the secondary side refrigerant circuit 10.
- the refrigerant used in the primary side refrigerant circuit 5a is not particularly limited, and is HFC-32, an HFO-based refrigerant, a mixed refrigerant of HFC-32 and an HFO-based refrigerant, carbon dioxide, ammonia, and propane. Etc. can be used.
- the refrigerant used in the secondary side refrigerant circuit 10 is not particularly limited, and HFC-32, HFO-based refrigerant, a mixed refrigerant of HFC-32 and HFO-based refrigerant, carbon dioxide, ammonia, propane and the like can be used. Can be used.
- HFO-based refrigerant for example, HFO-1234yf, HFO-1234ze, or the like can be used.
- the same refrigerant may be used or different refrigerants may be used in the primary side refrigerant circuit 5a and the secondary side refrigerant circuit 10.
- the secondary side refrigerant circuit 10 is not limited to the refrigerant circuit capable of simultaneous cooling and heating operation, and the heat source unit 2 and the utilization units 3a, 3b, and 3c are connected via two connecting pipes. It may be a circuit that has been used.
- Refrigeration cycle system 2 Heat source unit 2x: Heat source casing (second casing) 3a: 1st utilization unit 3b: 2nd utilization unit 3c: 3rd utilization unit 5: Primary side unit 5a: Primary side refrigerant circuit (1st circuit) 5x: Primary casing (first casing) 7: Secondary side third connecting pipe (connecting pipe) 8: Secondary side first communication pipe (communication pipe) 9: Secondary side second connecting pipe (communication pipe) 10: Secondary side refrigerant circuit (second circuit) 12: Heat source circuit 13a-c: Utilization circuit 20: Heat source side control unit 21: Secondary side compressor (second compressor) 21a: Compressor motor 22: Secondary side switching mechanism 23: Suction flow path 24: Discharge flow path 25: Third heat source piping 26: Fourth heat source piping 27: Fifth heat source piping 28: First heat source piping 29: Second Heat source piping 30: Secondary side accumulator 34: Oil separator 35: Cascade heat exchanger 35a: Secondary side flow path 35b: Primary side flow path 36: Heat source side expansion valve
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Abstract
Description
図1は、冷凍サイクルシステム1の概略構成図である。図2は、冷凍サイクルシステム1の概略機能ブロック構成図である。
一次側冷媒回路5aは、一次側圧縮機71(第1圧縮機に相当)と、一次側切換機構72と、一次側熱交換器74(第1熱交換器に相当)と、一次側第1膨張弁76と、一次側過冷却熱交換器103と、一次側過冷却回路104と、一次側過冷却膨張弁104aと、第1液閉鎖弁108と、一次側第1連絡管111(第1配管に相当)と、第2液閉鎖弁106と、第1接続配管115と、一次側レシーバ101と、第3接続配管114と、一次側第2膨張弁102(膨張弁に相当)と、二次側冷媒回路10と共有しているカスケード熱交換器35と、第2接続配管113と、第2ガス閉鎖弁107と、一次側第2連絡管112(第2配管に相当)と、第1ガス閉鎖弁109と、一次側アキュムレータ105と、を有している。
二次側冷媒回路10は、複数の利用ユニット3a、3b、3cと、複数の分岐ユニット6a、6b、6cと、熱源ユニット2と、が互いに接続されて構成されている。各利用ユニット3a、3b、3cは、対応する分岐ユニット6a、6b、6cと、1対1に接続されている。具体的には、利用ユニット3aと分岐ユニット6aとは第1接続管15aおよび第2接続管16aを介して接続され、利用ユニット3bと分岐ユニット6bとは第1接続管15bおよび第2接続管16bを介して接続され、利用ユニット3cと分岐ユニット6cとは第1接続管15cおよび第2接続管16cを介して接続されている。また、各分岐ユニット6a、6b、6cは、熱源ユニット2と、3つの連絡管である二次側第3連絡管7と二次側第1連絡管8と二次側第2連絡管9とを介して接続されている。具体的には、熱源ユニット2から延び出した二次側第3連絡管7と二次側第1連絡管8と二次側第2連絡管9とは、それぞれ複数に分岐して、各分岐ユニット6a、6b、6cに接続されている。
一次側ユニット5は、利用ユニット3a、3b、3cや分岐ユニット6a、6b、6cが配置された空間とは異なる空間や屋上等に設置されている。
熱源ユニット2は、利用ユニット3a、3b、3cや分岐ユニット6a、6b、6cが配置された空間とは異なる空間や屋上等に設置されている。
利用ユニット3a、3b、3cは、ビル等の室内の天井に埋め込みや吊り下げ等、または、室内の壁面に壁掛け等により設置されている。
分岐ユニット6a、6b、6cは、ビル等の室内の天井裏の空間等に設置されている。
冷凍サイクルシステム1では、上述の熱源側制御部20、利用側制御部50a、50b、50c、分岐ユニット制御部60a、60b、60c、一次側制御部70が、有線または無線を介して相互に通信可能に接続されることで、制御部80を構成している。したがって、この制御部80は、各種センサ37、38、39、83、84、85、86、87、88、77、78、79、81、82、58a、58b、58c等の検出情報および図示しないリモコン等から受け付けた指示情報等に基づいて、各部21(21a)、22、36、44、46a、48a、51a、51b、51c、53a、53b、53c(54a、54b、54c)、66a、66b、66c、67a、67b、67c、71(71a)、72、75(75a)、76、102、104aの動作を制御する。
次に、冷凍サイクルシステム1の動作について、図3~図6を用いて説明する。
冷房運転では、例えば、利用ユニット3a、3b、3cの利用側熱交換器52a、52b、52cの全てが冷媒の蒸発器として機能する運転を行い、カスケード熱交換器35が二次側の冷媒の放熱器として機能する運転を行う。この冷房運転では、冷凍サイクルシステム1の一次側冷媒回路5aおよび二次側冷媒回路10は、図3に示すように構成される。なお、図3の一次側冷媒回路5aに付された矢印および二次側冷媒回路10に付された矢印は、冷房運転時の冷媒の流れを示している。
暖房運転では、例えば、利用ユニット3a、3b、3cの利用側熱交換器52a、52b、52cの全てが冷媒の放熱器として機能する運転を行う。また、暖房運転では、カスケード熱交換器35が二次側の冷媒の蒸発器として機能する運転を行う。暖房運転では、冷凍サイクルシステム1の一次側冷媒回路5aおよび二次側冷媒回路10は、図4に示すように構成される。図4の一次側冷媒回路5aに付された矢印および二次側冷媒回路10に付された矢印は、暖房運転時の冷媒の流れを示している。
冷房主体運転では、例えば、利用ユニット3a、3bの利用側熱交換器52a、52bが冷媒の蒸発器として機能し、かつ、利用ユニット3cの利用側熱交換器52cが冷媒の放熱器として機能する運転を行う。冷房主体運転では、カスケード熱交換器35は、二次側の冷媒の放熱器として機能する。冷房主体運転では、冷凍サイクルシステム1の一次側冷媒回路5aおよび二次側冷媒回路10は、図5に示されるように構成される。図5の一次側冷媒回路5aに付された矢印および二次側冷媒回路10に付された矢印は、冷房主体運転時の冷媒の流れを示している。
暖房主体運転では、例えば、利用ユニット3a、3bの利用側熱交換器52a、52bが冷媒の放熱器として機能し、かつ、利用側熱交換器52cが冷媒の蒸発器として機能する運転を行う。暖房主体運転では、カスケード熱交換器35は、二次側の冷媒の蒸発器として機能する。暖房主体運転では、冷凍サイクルシステム1の一次側冷媒回路5aおよび二次側冷媒回路10は、図6に示すように構成される。図6の一次側冷媒回路5aに付された矢印および二次側冷媒回路10に付された矢印は、暖房主体運転時の冷媒の流れを示している。
図7に、一次側ユニット5と熱源ユニット2が接続されている様子を示す概略外観図を示す。
本実施形態の冷凍サイクルシステム1では、一次側冷媒回路5aの一次側レシーバ101が、一次側ユニット5ではなく、熱源ユニット2に設けられている。このため、一次側ユニット5として、比較的多量の一次側の冷媒が充填されているものを用いて冷凍サイクルシステム1を構成する場合に、一次側冷媒回路5aにおいて一次側の冷媒が余剰しがちであっても、その余剰分を一次側レシーバ101に貯留させることが可能になっている。これにより、余剰冷媒による一次側冷媒回路5aの能力低下を抑制することが可能になる。
(12-1)他の実施形態A
上記実施形態では、一次側レシーバ101が熱源ユニット2に設けられている場合を例として挙げて説明した。
上記実施形態では、カスケード熱交換器35が熱源ユニット2の熱源ケーシング2x内に収容されている場合を例として挙げて説明した。
上記実施形態では、一次側第1連絡管111と一次側第2連絡管112とが、熱源ケーシング2xの第1側面120aに形成された1つの開口120xを通過するように設けられた構造について例に挙げて説明した。
上記実施形態では、一次側冷媒回路5aにおいて用いられる冷媒としてR32を例示し、二次側冷媒回路10において用いられる冷媒として二酸化炭素を例示した。
上記実施形態では、二次側冷媒回路10として、二次側第1連絡管8と二次側第2連絡管9と二次側第3連絡管7を有する三管式の冷暖同時運転可能な冷媒回路を例に挙げて例示した。
以上、本開示の実施形態を説明したが、特許請求の範囲に記載された本開示の趣旨及び範囲から逸脱することなく、形態や詳細の多様な変更が可能なことが理解されるであろう。
2 :熱源ユニット
2x :熱源ケーシング(第2ケーシング)
3a :第1利用ユニット
3b :第2利用ユニット
3c :第3利用ユニット
5 :一次側ユニット
5a :一次側冷媒回路(第1回路)
5x :一次側ケーシング(第1ケーシング)
7 :二次側第3連絡管(連絡管)
8 :二次側第1連絡管(連絡管)
9 :二次側第2連絡管(連絡管)
10 :二次側冷媒回路(第2回路)
12 :熱源回路
13a-c:利用回路
20 :熱源側制御部
21 :二次側圧縮機(第2圧縮機)
21a :圧縮機モータ
22 :二次側切換機構
23 :吸入流路
24 :吐出流路
25 :第3熱源配管
26 :第4熱源配管
27 :第5熱源配管
28 :第1熱源配管
29 :第2熱源配管
30 :二次側アキュムレータ
34 :油分離器
35 :カスケード熱交換器
35a :二次側流路
35b :一次側流路
36 :熱源側膨張弁
37 :二次側吸入圧力センサ
38 :二次側吐出圧力センサ
39 :二次側吐出温度センサ
40 :油戻し回路
41 :油戻し流路
42 :油戻しキャピラリーチューブ
44 :油戻し開閉弁
45 :二次側レシーバ
46 :バイパス回路
46a :バイパス膨張弁
47 :二次側過冷却熱交換器
48 :二次側過冷却回路
48a :二次側過冷却膨張弁
50a-c:利用側制御部
51a-c:利用側膨張弁
52a-c:利用側熱交換器(第2熱交換器)
53a-c:室内ファン
56a、56b、56c:第2利用配管
57a、57b、57c:第1利用配管
58a、58b、58c:液側温度センサ
60a、60b、60c:分岐ユニット制御部
61a、61b、61c:第3分岐配管
62a、62b、62c:合流配管
63a、63b、63c:第1分岐配管
64a、64b、64c:第2分岐配管
66a、66b、66c:第1調節弁
67a、67b、67c:第2調節弁
70 :一次側制御部
71 :一次側圧縮機(第1圧縮機)
72 :一次側切換機構
74 :一次側熱交換器(第1熱交換器)
76 :一次側第1膨張弁
77 :外気温度センサ
78 :一次側吐出圧力センサ
79 :一次側吸入圧力センサ
81 :一次側吸入温度センサ
82 :一次側熱交温度センサ
83 :二次側カスケード温度センサ
84 :レシーバ出口温度センサ
85 :バイパス回路温度センサ
86 :過冷却出口温度センサ
87 :過冷却回路温度センサ
88 :二次側吸入温度センサ
80 :制御部
101 :一次側レシーバ(レシーバ)
102 :一次側第2膨張弁(膨張弁)
103 :一次側過冷却熱交換器
104 :一次側過冷却回路
104a :一次側過冷却膨張弁
105 :一次側アキュムレータ
111 :一次側第1連絡管(第1配管)
112 :一次側第2連絡管(第2配管)
113 :第2接続配管
114 :第3接続配管
115 :第1接続配管
120a :第1側面(面)
120b :天面(面)
120c :第2側面(面)
120d :底面(面)
120x :開口(第1配管および第2配管の通る開口)
130 :レシーバユニット
130x :レシーバケーシング(第3ケーシング)
131a :接続面
131x :開口
Claims (6)
- 第1冷媒が循環する回路であって、第1圧縮機(71)と、カスケード熱交換器(35)と、レシーバ(101)と、第1熱交換器(74)と、を有する第1回路(5a)と、
第2冷媒が循環する回路であって、第2圧縮機(21)と、前記カスケード熱交換器(35)と、第2熱交換器(52a、52b、52c)と、を有する第2回路(10)と、
前記第1圧縮機を収容する第1ケーシング(5x)と、
前記第2圧縮機を収容する第2ケーシング(2x)と、
を備え、
前記レシーバは、前記第1ケーシング外に設けられる、
冷凍サイクルシステム(1)。 - 前記カスケード熱交換器は、前記第2ケーシングに設けられている、
請求項1に記載の冷凍サイクルシステム。 - 前記レシーバは、前記第2ケーシングに設けられている、
請求項1または2に記載の冷凍サイクルシステム。 - 前記第1ケーシング及び前記第2ケーシングとは別体である第3ケーシング(130x)をさらに備え、
前記レシーバは、前記第3ケーシングに収容される、
請求項1または2に記載の冷凍サイクルシステム。 - 前記カスケード熱交換器および前記レシーバは、前記第2ケーシング内に設けられており、
前記第1回路は、前記カスケード熱交換器から前記第2ケーシング外へ延びる第1配管(115、111)と、前記レシーバから前記第2ケーシング外へ延びる第2配管(113、112)と、を有しており、
前記第2ケーシングは、複数の面(120a、120b、120c、120d)を有しており、
前記第1配管および前記第2配管の通る開口(120x)、又は、前記第1配管の通る開口および前記第2配管の通る開口が、複数の前記面のうちの1つの面に設けられている、
請求項1から3のいずれか1項に記載の冷凍サイクルシステム。 - 前記第1回路は、前記カスケード熱交換器と前記レシーバの間に設けられた膨張弁(102)を有している、
請求項1から5のいずれか1項に記載の冷凍サイクルシステム。
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