WO2007148727A1 - 冷凍装置 - Google Patents
冷凍装置 Download PDFInfo
- Publication number
- WO2007148727A1 WO2007148727A1 PCT/JP2007/062431 JP2007062431W WO2007148727A1 WO 2007148727 A1 WO2007148727 A1 WO 2007148727A1 JP 2007062431 W JP2007062431 W JP 2007062431W WO 2007148727 A1 WO2007148727 A1 WO 2007148727A1
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- WO
- WIPO (PCT)
- Prior art keywords
- refrigerant
- heat exchanger
- gas
- liquid
- circuit
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B11/00—Compression machines, plants or systems, using turbines, e.g. gas turbines
- F25B11/02—Compression machines, plants or systems, using turbines, e.g. gas turbines as expanders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/06—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using expanders
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
- F25B2309/061—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide with cycle highest pressure above the supercritical pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/0272—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using bridge circuits of one-way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B2400/23—Separators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0253—Compressor control by controlling speed with variable speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention relates to a refrigeration apparatus capable of performing a cooling operation for circulating a refrigerant in a refrigerant circuit so that a heat source side heat exchanger serves as a condenser and a use side heat exchanger serves as an evaporator. .
- refrigerant is used such that the heat source side heat exchanger serves as a condenser and the use side heat exchanger serves as an evaporator.
- a refrigeration apparatus capable of performing a cooling operation for circulating the water. This type of refrigeration system is used, for example, as an air conditioner that performs indoor air conditioning by an indoor unit provided with a use-side heat exchanger.
- Patent Document 1 discloses an air conditioner in which a compressor, an expander, and a motor are connected by a single drive shaft as an example of this type of refrigeration apparatus.
- This air conditioner is configured to recover the power obtained by the expansion of the cooling medium by the expander and use the recovered power for driving the compressor.
- a refrigerant adjustment tank is provided downstream of the expander in the refrigerant circuit of the air conditioner.
- the indoor heat exchanger serves as an evaporator and performs the refrigeration cycle
- the gas-liquid two-phase refrigerant flowing out of the expander flows into the refrigerant adjustment tank and is separated into the liquid refrigerant and the gas refrigerant. .
- the liquid refrigerant in the refrigerant adjustment tank is sent to the indoor heat exchanger.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2006_71137
- the liquid refrigerant supplied to the utilization side circuit during the cooling operation is in a saturated liquid state because it is gas-liquid separated in the refrigerant adjustment tank. For this reason, the refrigerant that has flowed out of the refrigerant adjustment tank is immediately changed to a gas-liquid two-phase state due to a pressure loss caused by the piping. In other words, the refrigerant cannot be sent to the user circuit in the liquid single phase state. Les.
- the present invention has been made in view of the points to be applied, and the purpose of the roller is to perform a cooling operation in which the heat source side heat exchanger serves as a condenser and the use side heat exchanger serves as an evaporator.
- the feasible refrigeration system is configured to be able to supply liquid single-phase refrigerant to the user circuit during the cooling operation.
- the first invention includes a heat source side circuit (14) provided with a compressor (30), an expander (31), and a heat source side heat exchanger (44), and a use side heat exchanger (41). And a refrigerant circuit (10) that circulates refrigerant to perform a refrigeration cycle, and the heat source side heat exchanger (44) serves as a condenser to
- the target is the refrigeration system (20) capable of performing the cooling operation in which the side heat exchanger (41) is an evaporator.
- the refrigeration apparatus (20) includes, in the heat source side circuit (14), a gas-liquid separator (35) that separates the refrigerant flowing from the expander (31) into liquid refrigerant and gas refrigerant, and the above In the cooling operation, cooling means (36, 45, 53, 55) for cooling the liquid refrigerant from the gas-liquid separator (35) to the use side circuit (11) is provided.
- the utilization side circuit (11) includes a variable opening degree utilization side expansion upstream of the utilization side heat exchanger (41) during the cooling operation. While the valve (51) is provided, the cooling means (36, 45) is connected to a gas supply pipe (37) for sending the gas refrigerant in the gas-liquid separator (35) to the compressor (30). A gas refrigerant depressurization mechanism (36) that depressurizes the refrigerant in the gas supply pipe (37), and a directional liquid refrigerant from the gas-liquid separator (35) to the use side circuit (11) in the cooling operation. And a cooling heat exchanger (45) for exchanging heat with the refrigerant depressurized by the gas refrigerant depressurization mechanism (36) for cooling.
- the cooling means (36, 45, 53) is a liquid refrigerant directed toward the user circuit (11) from the gas-liquid separator (35).
- Liquid refrigerant provided in a liquid supply pipe (52) for sending a part to the cooling heat exchanger (45) and depressurizing the refrigerant in the liquid supply pipe (52)
- the cooling heat exchanger (45) the liquid refrigerant directed from the gas-liquid separator (35) to the user circuit (11) is used for the liquid refrigerant during the cooling operation. Heat exchange is also possible with the refrigerant decompressed by the decompression mechanism (53).
- the cooling means (36, 45, 55) compresses part of the refrigerant condensed in the heat source side heat exchanger (44).
- a return refrigerant pressure reduction mechanism (55) provided in an injection pipe (42) for sending to the machine (30) to depressurize the refrigerant in the injection pipe (42).
- the cooling heat exchanger (45) During the cooling operation, heat exchange is possible between the gas-liquid separator (35) and the refrigerant whose pressure is reduced by the return refrigerant decompression mechanism (55) from the gas-liquid separator (35) to the use side circuit (11). .
- the cooling means (36, 45) sends a part of the refrigerant condensed in the heat source side heat exchanger (44) to the compressor (30).
- a return refrigerant decompression mechanism (55) provided in the injection pipe (42) for decompressing the refrigerant in the injection pipe (42), and the gas-liquid separator (35) force in response to the cooling operation.
- a cooling heat exchanger (45) is provided that cools the liquid refrigerant going to the use side circuit (11) by heat exchange with the refrigerant decompressed by the return refrigerant decompression mechanism (55).
- the sixth invention includes a heat source side circuit (14) provided with a compressor (30), an expander (31), and a heat source side heat exchanger (44), and a use side heat exchanger (41). And a refrigerant circuit (10) that circulates refrigerant to perform a refrigeration cycle, and the heat source side heat exchanger (44) serves as a condenser to
- the target is the refrigeration system (20) capable of performing the cooling operation in which the side heat exchanger (41) is an evaporator.
- the refrigeration apparatus (20) sends a part of the refrigerant downstream of the heat source side heat exchanger (44) to the compressor (30) in the cooling operation to the heat source side circuit (14).
- a supercooling heat exchanger (28) is provided that cools the refrigerant so that it is in a supercooled state by exchanging heat with the refrigerant decompressed by the return refrigerant decompression mechanism (55).
- the compressor (30) and the expander (31) are connected to each other by a single drive shaft.
- the use side circuit (11) and the refrigerant circuit (10) are provided in a plurality, and the heat source side circuit (14) In contrast, they are connected in parallel to each other.
- the refrigerant circuit (10) circulates the refrigerant so that the high pressure of the refrigeration cycle is higher than the critical pressure of the refrigerant.
- the refrigerant circuit (10) is filled with carbon dioxide as a cooling medium.
- the refrigerant flowing out of the expander (31) during the cooling operation flows into the gas-liquid separator (35) and is separated into the liquid refrigerant and the gas refrigerant. Then, the liquid refrigerant flowing out of the gas-liquid separator (35) is cooled by the cooling means (36, 45, 53, 55) in the middle of the direction toward the use side circuit (11). The saturated liquid refrigerant that has flowed out of the gas-liquid separator (35) is cooled by the cooling means (36, 45, 53, 55) to be in a supercooled state.
- the gas refrigerant in the gas-liquid separator (35) flows into the gas supply pipe (37) and is depressurized by the gas refrigerant decompression mechanism (36). That temperature drops.
- the cooling heat exchanger (45) the refrigerant whose pressure has been reduced by the pressure reduction mechanism (36) for gas refrigerant and the liquid refrigerant from the gas-liquid separator (35) to the user side circuit (11) And exchange heat.
- the liquid refrigerant traveling from the gas-liquid separator (35) to the use side circuit (11) is cooled and becomes a supercooled state.
- the gas refrigerant in the gas-liquid separator (35) is used to cool the liquid refrigerant directed to the gas-liquid separator (35) force utilization side circuit (11).
- the liquid refrigerant traveling from the gas-liquid separator (35) to the use side circuit (11) is not only the refrigerant whose temperature has been lowered by the gas refrigerant decompression mechanism (36), but also the liquid refrigerant. Heat exchange can also be performed with the liquid refrigerant whose temperature has been lowered by the refrigerant decompression mechanism (53).
- the fourth invention during the cooling operation, a part of the refrigerant condensed in the heat source side heat exchanger (44) flows into the intake pipe (42) and is returned to the return refrigerant decompression mechanism (55). Decompressed and its temperature Decreases.
- the cooling heat exchanger (45) the liquid refrigerant flowing from the gas-liquid separator (35) to the user circuit (11) is returned only by the refrigerant whose temperature has been lowered by the gas refrigerant decompression mechanism (36). It is possible to exchange heat with the refrigerant whose temperature has been lowered by the refrigerant decompression mechanism (55).
- the fifth aspect of the invention during the cooling operation, a part of the refrigerant condensed in the heat source side heat exchanger (44) flows into the induction tube (42) and is reduced in pressure by the return refrigerant decompression mechanism (55). And its temperature drops. Then, in the cooling heat exchanger (45), the refrigerant whose temperature has been lowered by the return refrigerant decompression mechanism (55) and the directional liquid refrigerant to the gas-liquid separator (35) force utilization side circuit (11). Perform heat exchange. As a result, the directional liquid refrigerant is cooled from the gas-liquid separator (35) to the use side circuit (11) to be in a supercooled state.
- the sixth invention during the cooling operation, a part of the refrigerant downstream of the heat source side heat exchanger (44) flows into the intake pipe (42) and is returned to the return refrigerant decompression mechanism (55). The pressure is reduced and the temperature drops.
- the supercooling heat exchanger (28) the refrigerant that has flowed out of the expander (31) is cooled by performing heat exchange with the refrigerant whose temperature has decreased in the return-cooling medium decompression mechanism (55), and is supercooled. It becomes a state.
- the compressor (30) and the expander (31) are coupled to each other by a single drive shaft. Therefore, the power recovered as the refrigerant expands in the expander (31) is transmitted to the compressor (30) via the drive shaft.
- the plurality of use side circuits (11) are connected in parallel to the heat source side circuit (14).
- the refrigerant that has been cooled by the cooling means (36, 45, 53, 55) of the heat source side circuit (14) and is in a supercooled state is sent to each use side circuit (11).
- the high pressure of the refrigeration cycle performed in the refrigerant circuit (10) is set to a value higher than the critical pressure of the refrigerant. That is, the refrigerant discharged from the compressor (30) is in a supercritical state.
- carbon dioxide is used as the refrigerant charged in the refrigerant circuit (10).
- the high pressure of the refrigeration cycle performed in the refrigerant circuit (10) is set to a value higher than the critical pressure of carbon dioxide.
- liquid cooling is performed from the heat source side circuit (14) to the user side circuit (11) during the cooling operation.
- the medium is supercooled.
- the supercooled refrigerant does not immediately enter a gas-liquid two-phase state but remains in a liquid state even if it receives a pressure loss. Therefore, the refrigerant can be supplied to the use side circuit (11) in the liquid single phase state. As a result, the pressure loss experienced by the refrigerant is reduced as compared with the case where the refrigerant changes to a gas-liquid two-phase state before reaching the use side circuit (11).
- the refrigerant enthalpy difference between the inlet and outlet of the use side heat exchanger (41) increases, and the proportion of liquid refrigerant flowing into the use side heat exchanger (41) increases.
- the cooling capacity per unit refrigerant flow rate in the vessel (41) is improved. Therefore, the operating efficiency of the refrigeration apparatus (20) can be improved.
- the gas refrigerant in the gas-liquid separator (35) is used to cool the liquid coolant sent from the gas-liquid separator (35) to the utilization side circuit (11). Used. Gas refrigerant accumulates in the gas-liquid separator (35). Therefore, the refrigerant flowing from the expander (31) is easily separated into the liquid refrigerant and the gas refrigerant by the gas-liquid separator (35).
- the liquid refrigerant traveling from the gas-liquid separator (35) to the use side circuit (11) has a temperature reduced by the gas refrigerant decompression mechanism (36). Not only the lowered refrigerant but also the liquid refrigerant whose temperature has been lowered by the liquid refrigerant decompression mechanism (53) can be exchanged. Therefore, in the cooling heat exchanger (45), the directional liquid refrigerant can exchange heat with more refrigerant from the gas-liquid separator (35) to the utilization side circuit (11). The degree of supercooling of the liquid refrigerant directed from the separator (35) to the user circuit (11) can be increased. For this reason, even when the pressure loss up to the use side circuit (11) is relatively large, it is possible to reliably supply the liquid refrigerant to the use side circuit (11).
- the liquid refrigerant traveling from the gas-liquid separator (35) to the use side circuit (11) is heated by the gas refrigerant decompression mechanism (36). Not only the lowered refrigerant but also the refrigerant whose temperature has been lowered by the return refrigerant decompression mechanism (55) can be exchanged. Therefore, in the cooling heat exchanger (45), the directional liquid refrigerant can exchange heat with more refrigerant from the gas-liquid separator (35) to the utilization side circuit (11). From the separator (35) to the use side circuit (11) The supercooling degree of the liquid refrigerant can be increased.
- the refrigerant that has been cooled by the cooling means (36, 45, 53, 55) of the heat source side circuit (14) and is in a supercooled state is used for each use.
- the supercooled refrigerant does not immediately enter a gas-liquid two-phase state even if it receives a pressure loss, but remains in a liquid state. Therefore, the refrigerant can be supplied to each user circuit (11) in the liquid single phase state.
- the refrigerant sent from the heat source side circuit (14) to each usage side circuit (11) is a liquid refrigerant in a saturated state after gas-liquid separation. It changes to a liquid two-phase state.
- the refrigerant in the gas-liquid two-phase state has different gravity and pressure loss when moving between the liquid refrigerant and the gas refrigerant. For this reason, the state of the refrigerant flowing into each user circuit (11)
- FIG. 1 is a schematic configuration diagram of an air conditioner according to Embodiment 1. [0034] FIG.
- FIG. 2 is a Mollier diagram showing a refrigeration cycle during cooling operation in the air conditioner according to Embodiment 1.
- FIG. 3 is a schematic configuration diagram of an air conditioner according to Modification 1 of Embodiment 1.
- FIG. 4 is a schematic configuration diagram of an air conditioner according to a second modification of the first embodiment.
- FIG. 5 is a schematic configuration diagram of an air conditioner according to Modification 3 of Embodiment 1. 6] FIG. 6 is a schematic configuration diagram of an air conditioner according to the second embodiment.
- FIG. 7 is a schematic configuration diagram of an air conditioner according to a modification of the second embodiment.
- FIG. 8 is a schematic configuration diagram of an air conditioner according to a first modification of the other embodiment.
- FIG. 9 is a schematic configuration diagram of an air conditioner according to a second modification of the other embodiment.
- FIG. 10 is a schematic configuration diagram of an air conditioner according to a third modification of the other embodiment.
- FIG. 11 is a schematic configuration diagram of an air conditioner according to a fourth modification of the other embodiment.
- FIG. 12 is a schematic configuration diagram of an air conditioner according to a fifth modification of the other embodiment.
- FIG. 13 is a schematic configuration diagram of an air conditioner according to a sixth modification of the other embodiment.
- Air conditioner refrigeration equipment
- the air conditioner (20) of the first embodiment is constituted by the refrigeration apparatus (20) according to the present invention.
- the air conditioner (20) includes one outdoor unit (64) and three indoor units (61a, 61b, 61c).
- the number of indoor units (61a, 61b, 61c) is merely an example.
- the three indoor units (61a, 61b, 61c) include a first indoor unit (61a), a second indoor unit (61b), and a third indoor unit (61c). These indoor units (61a, 61b, 61c) are installed on different floors in the building, and are in the order of the first indoor unit (61a), the second indoor unit (61b), and the third indoor unit (61c). It is on the upper floor.
- the outdoor unit (64) is installed on the lowest floor of the building.
- the air conditioner (20) of Embodiment 1 is a refrigerant circuit filled with carbon dioxide (CO) as a refrigerant.
- Freezing cycle is performed.
- the high pressure of the refrigeration cycle is set higher than the critical pressure of carbon dioxide.
- the refrigerant circuit (10) includes three indoor circuits (lla, llb, llc) that are use side circuits and one outdoor circuit (14) that is a heat source side circuit. These indoor circuits (l la, l lb, l lc) are connected in parallel to the outdoor circuit (14) by the first connecting pipe (15) and the second connecting pipe (16). Specifically, the first connecting pipe (15) has one end connected to the first shut-off valve (17) of the outdoor circuit (14) and the other end branched into three so that each indoor circuit (l la, l lb , l lc) is connected to the liquid side end. One end of the second connecting pipe (16) is connected to the second shut-off valve (18) of the outdoor circuit (14), and the other end is divided into three to each indoor circuit (1 la, 1 lb, 1 lc) connected to the gas side end.
- the outdoor circuit (14) is accommodated in the outdoor unit (64).
- the outdoor circuit (14) includes a compression / expansion unit (26), an outdoor heat exchanger (44), a gas-liquid separator (35), an expansion valve for gas refrigerant (36), an internal heat exchanger (45), four A path switching valve (25) and a bridge circuit (24) are provided.
- Internal heat exchanger (45) which is a heat exchanger for cooling
- gas refrigerant which is a decompression mechanism for gas refrigerant
- the expansion valve (36) constitutes the cooling means (36, 45) according to the present invention.
- the outdoor unit (64) is provided with an outdoor fan for sending outdoor air to the outdoor heat exchanger (44) (not shown).
- the compression / expansion unit (26) includes a casing (21) which is a vertically long and cylindrical sealed container.
- the casing (21) houses the compressor (30), the expander (31), and the electric motor (32).
- the compressor (30), the electric motor (32), and the expander (31) are arranged in order from the bottom to the top, and are connected to each other by a single drive shaft.
- Each of the compressor (30) and the expander (31) is constituted by a positive displacement fluid machine (oscillating piston type rotary fluid machine, rolling piston type rotary fluid machine, scroll fluid machine, etc.). Has been.
- the compressor (30) keeps the sucked refrigerant (CO) above its critical pressure.
- the expander (31) expands the inflowing refrigerant (C ⁇ ) to generate power (expansion power).
- the compressor (30) is rotationally driven by both the power collected by the expander (31) and the power obtained by energizing the electric motor (32).
- the electric motor (32) is supplied with AC power having a predetermined frequency from an inverter (not shown).
- the compressor (30) has a variable capacity by changing the frequency of the electric power supplied to the electric motor (32).
- the compressor (30) and the expander (31) always rotate at the same rotational speed.
- the outdoor heat exchanger (44) which is a heat source side heat exchanger, is configured as a cross-fin type fin 'and' tube heat exchanger. Outdoor air is supplied to the outdoor heat exchanger (44) by an outdoor fan. In the outdoor heat exchanger (44), heat is exchanged between the outdoor air and the refrigerant. One end of the outdoor heat exchanger (44) is connected to the third port of the four-way selector valve (25), and the other end is connected to the bridge circuit (24).
- the gas-liquid separator (35) is a vertically long and cylindrical sealed container.
- the gas-liquid separator (35) is for adjusting the amount of refrigerant circulating in the refrigerant circuit (10), and is connected to the outflow side of the expander (31) via a refrigerant pipe.
- the refrigerant pipe is opened at an upper position in the gas-liquid separator (35) so as to be opened in the gas space in the gas-liquid separator (35).
- a liquid pipe (38) connected to the bridge circuit (24) is connected to the bottom of the gas-liquid separator (35).
- a gas supply pipe (37) connected to the suction side of the compressor (30) is connected to the top of the gas-liquid separator (35).
- the gas refrigerant expansion valve (36) is provided in the gas supply pipe (37). It has been.
- the gas refrigerant expansion valve (36) is an electronic expansion valve having a variable opening.
- the internal heat exchanger (45) is provided across the gas supply pipe (37) and the liquid pipe (38).
- the internal heat exchanger (45) has a first flow path (46) installed in the middle of the liquid pipe (38) and a second flow path (47) installed in the middle of the gas supply pipe (37). I have.
- the first flow path (46) and the second flow path (47) are arranged adjacent to each other, and the refrigerant of the first flow path (46) and the second flow path ( The refrigerant of 47) is configured to exchange heat.
- the cooling operation which is a cooling operation
- the internal heat exchanger (45) causes the liquid refrigerant flowing out from the bottom of the gas-liquid separator (35) to flow through the first flow path (46), and the gas-liquid separator. Heat exchange is performed with the refrigerant flowing through the second flow path (47) that has flowed out of the top of (35) and reduced in pressure by the gas refrigerant expansion valve (36) to a low temperature.
- the bridge circuit (24) is formed by connecting four check valves (CV-1 to CV_4) in a bridge shape.
- a liquid pipe (38) is connected to the inflow side of the first check valve (CV-1) and the fourth check valve (CV-4) in the bridge circuit (24).
- the outflow sides of the second check valve (CV-2) and the third check valve (CV-3) are connected to the inflow side of the expander (31).
- the outflow side of the first check valve (CV-1) and the inflow side of the second check valve (CV-2) are connected to the first closing valve (17).
- the inflow side of the third check valve (CV-3) and the outflow side of the fourth check valve (CV-4) are connected to the outdoor heat exchanger (44).
- the first port of the four-way selector valve (25) is connected to the suction side of the compressor (30).
- the second port is connected to the second closing valve (18).
- the third port is connected to the outdoor heat exchanger (44).
- the fourth port is connected to the discharge side of the compressor (30).
- the four-way selector valve (25) has a state in which the first port and the second port communicate with each other and the third port and the fourth port communicate with each other (first state indicated by a solid line in FIG. 1)
- the first port and the third port communicate with each other, and the second port and the fourth port communicate with each other (second state indicated by a broken line in FIG. 1). Yes.
- Each indoor circuit (l la, l lb, l lc) is accommodated in each indoor unit (61a, 61b, 61c).
- Each indoor circuit (11 &, 1113, 110) has an indoor heat exchanger (41a, 41b, 41c) that is a use side heat exchanger and a use side expansion in order from the gas side end to the liquid side end.
- Indoor expansion that is a valve Valves (51a, 51b, 51c) are provided.
- Each indoor unit (61a, 61b, 61c) is provided with an indoor fan for sending indoor air to each indoor heat exchanger (41a, 41b, 41c) (not shown).
- the indoor heat exchangers (41a, 41b, 41c) are configured as cross-fin type fin-and-tube heat exchangers. Indoor air is supplied to the indoor heat exchangers (41a, 41b, 41c) by an indoor fan. In the indoor heat exchangers (41a, 41b, 41c), heat is exchanged between the indoor air and the refrigerant.
- the indoor expansion valves (51a, 51b, 51c) are configured by electronic expansion valves with variable opening.
- the air conditioner (20) can perform a cooling operation (cooling operation) and a heating operation, and the operation is switched by a four-way switching valve (33).
- the four-way selector valve (25) is set to the second state indicated by the broken line in FIG.
- the opening degree of each indoor expansion valve (51a, 51b, 51c) is adjusted individually.
- the gas refrigerant expansion valve (36) is kept fully open.
- the compressor (30) is driven in this state, the refrigerant circulates in the refrigerant circuit (10) to perform a refrigeration cycle.
- the indoor heat exchangers (41a, 41b, 41c) function as a condenser
- the outdoor heat exchanger (44) functions as an evaporator.
- the compressor (30) discharges the refrigerant having a pressure higher than the critical pressure.
- This high-pressure refrigerant is distributed to each indoor circuit (lla, llb, llc) via the second connecting pipe (16).
- the refrigerant distributed to the indoor circuit (l la, l lb, l lc) exchanges heat with indoor air in the indoor heat exchangers (41a, 41b, 41c).
- the refrigerant dissipates heat to the room air and condenses, while the room air is heated and supplied to the room.
- the refrigerant condensed in the indoor heat exchangers (41a, 41b, 41c) joins in the first connecting pipe (15) and flows into the outdoor circuit (14).
- the refrigerant that has flowed into the outdoor circuit (14) flows into the expander (31) and is depressurized.
- the refrigerant decompressed by the expander (31) flows into the gas-liquid separator (35) and is separated into liquid refrigerant and gas refrigerant.
- the liquid refrigerant in the gas-liquid separator (35) flows out from the liquid pipe (38) and flows into the outdoor heat exchanger (44).
- the outdoor heat exchanger (44) the refrigerant flowing in exchanges heat with the outdoor air. This heat By exchange, the refrigerant absorbs heat from the outdoor air and evaporates.
- the refrigerant evaporated in the outdoor heat exchanger (44) is sucked into the compressor (30), compressed again, and discharged.
- the four-way selector valve (25) is set to the first state shown by the solid line in FIG.
- the opening degree of each indoor expansion valve (51a, 51b, 51c) is adjusted individually. Further, the opening degree of the gas refrigerant expansion valve (36) is appropriately adjusted.
- the compressor (30) is driven in this state, the refrigerant circulates in the refrigerant circuit (10) to perform a refrigeration cycle.
- the outdoor heat exchanger (44) functions as a condenser
- the indoor heat exchangers (41a, 41b, 41c) function as an evaporator.
- the compressor (30) discharges the refrigerant having a pressure higher than the critical pressure.
- This high-pressure refrigerant flows into the outdoor heat exchanger (44), dissipates heat to the outdoor air, and condenses.
- the refrigerant condensed in the outdoor heat exchanger (44) flows into the expander (31) and is depressurized.
- the refrigerant decompressed by the expander (31) flows into the gas-liquid separator (35) and is separated into liquid refrigerant and gas refrigerant.
- the saturated liquid refrigerant in the gas-liquid separator (35) flows out from the liquid pipe (38) and flows into the first flow path (46) of the internal heat exchanger (45).
- the saturated gas refrigerant in the gas-liquid separator (35) flows out from the gas supply pipe (37) and is decompressed by the gas refrigerant expansion valve (36), and then the first refrigerant in the internal heat exchanger (45). It flows into 2 flow paths (47). In the internal heat exchanger (45), heat is exchanged between the refrigerant in the first channel (46) and the refrigerant in the second channel (47).
- the refrigerant in the state of point A flows into the gas-liquid separator (35).
- the flowing refrigerant is separated into the saturated liquid at point B and the saturated gas at point C.
- the refrigerant at point B flows into the first flow path (46) of the internal heat exchanger (45).
- the refrigerant at point C is depressurized by the gas refrigerant expansion valve (36) and enters the state of point D (gas-liquid two-phase state), and then enters the second flow path (47) of the internal heat exchanger (45). Inflow.
- the internal heat exchanger (45) heat is exchanged between the refrigerant in the point B state and the refrigerant in the point D state.
- the refrigerant flowing into the first channel (46) has a higher temperature than the refrigerant flowing into the second channel (47). Therefore, the refrigerant in the first flow path (46) is cooled by the refrigerant in the second flow path (47), so that the supercooled state indicated by the point E is obtained.
- the refrigerant in the second flow path (47) is heated by the refrigerant in the first flow path (46), it enters an overheated state indicated by point F.
- the liquid refrigerant that has passed through the first flow path (46) is distributed to the indoor circuits (lla, llb, llc) via the first connecting pipe (15). Since the liquid refrigerant that has passed through the first flow path (46) is in a supercooled state, the pressure is reduced due to the pressure loss caused by the refrigerant piping before being distributed to each indoor circuit (l la, l lb, l lc). Although it falls, it does not become a gas-liquid two-phase state.
- the liquid refrigerant distributed to the indoor circuit (l la, l lb, l lc) is decompressed by the indoor expansion valves (51a, 51b, 51c) and flows into the indoor heat exchangers (41a, 41b, 41c).
- the low-pressure refrigerant flowing into the indoor heat exchangers (41a, 41b, 41c) exchanges heat with the indoor air.
- the refrigerant absorbs heat from the room air and evaporates, while the room air is cooled and supplied to the room.
- the refrigerant evaporated in the indoor heat exchangers (41a, 41b, 41c) joins in the second communication pipe (16) and flows into the outdoor circuit (14).
- the refrigerant flowing into the outdoor circuit (14) merges with the refrigerant from the second flow path (47) toward the compressor (30), and is sucked into the compressor (30).
- the refrigerant sucked into the compressor (30) is compressed again and discharged.
- the refrigerant sucked by the compressor (30) is adjusted to an overheated state in order to prevent liquid compression in the compressor (30).
- Gas supply pipe (37) Force If superheated refrigerant does not flow, the degree of superheat of the refrigerant at the outlet of the indoor heat exchanger (41a, 41b, 41c) in each indoor unit (61a, 61b, 61c) For example, adjust the opening of the indoor expansion valves (51a, 51b, 51c) to 5 degrees.
- the liquid refrigerant directed from the outdoor circuit (14) to the indoor circuit (11) during the cooling operation is set in a supercooled state.
- the supercooled refrigerant does not immediately enter a gas-liquid two-phase state even after pressure loss, but remains in a liquid state. Therefore, the refrigerant can be supplied to the indoor circuit (11) in the liquid single phase state. Thereby, the pressure loss received by the refrigerant is reduced as compared with the case where the refrigerant changes to the gas-liquid two-phase state before reaching the indoor circuit (11).
- the superheated refrigerant is supplied from the gas supply pipe (37) to the suction side of the compressor (30), whereby each indoor heat exchanger (41 ) Can be set to a small value. Therefore, since the amount of heat exchange in each indoor heat exchanger (41) can be increased, the operating efficiency of the air conditioner (20) can be improved.
- the gas refrigerant in the gas-liquid separator (35) is used to cool the liquid refrigerant sent from the gas-liquid separator (35) to the indoor circuit (11). .
- Gas refrigerant accumulates in the gas-liquid separator (35). Therefore, the refrigerant flowing from the expander (31) is easily separated into the liquid refrigerant and the gas refrigerant by the gas-liquid separator (35).
- Embodiment 1 since the compressor (30) and the expander (31) are connected to each other by a single drive shaft, recovery is performed as the refrigerant expands in the expander (31). The transmitted power is transmitted to the compressor (30). Therefore, since the power for driving the compressor (30) can be reduced, the operating efficiency of the air conditioner (20) can be improved.
- the refrigerant that has been cooled by the cooling means (36, 45, 53, 55) of the outdoor circuit (14) to be in a supercooled state is transferred to each indoor circuit ( Sent to 11).
- the supercooled refrigerant does not immediately enter the gas-liquid two-phase state even when the pressure loss is received, but remains in the liquid state. Therefore, supply refrigerant to each indoor circuit (11) in the liquid single phase state. Therefore, there is no bias in the refrigerant state in each indoor circuit (11). Therefore, regardless of the arrangement of the indoor circuit (11), any of the indoor circuits (11).
- the differential pressure of the refrigeration cycle can be increased as compared with other refrigerants. Therefore, the recovery dynamics of the expander can be improved and the efficiency of the refrigeration apparatus can be improved.
- the heat source side circuit (14) is provided with an injection pipe (42).
- One end of the instruction pipe (42) is connected between the bridge circuit (24) and the inflow side of the expander (31), and the other end is connected to the suction side of the compressor (30).
- the index pipe (42) is provided with a return refrigerant expansion valve (55) which is a return refrigerant pressure reducing mechanism.
- the return refrigerant expansion valve (55) is an electronic expansion valve with variable opening.
- the internal heat exchanger (45) is provided across the liquid pipe (38) and the induction pipe (42).
- the second channel (47) is a part of the injection pipe (42).
- the internal heat exchanger (45) and the return refrigerant expansion valve (55) constitute the cooling means (45, 55) according to the present invention.
- the return refrigerant expansion valve (55) is opened.
- the return refrigerant expansion valve (55) part of the refrigerant condensed in the outdoor heat exchanger (44) flows into the injection pipe (42) and is reduced in pressure by the return refrigerant expansion valve (55). And flows into the second flow path (47) of the internal heat exchanger (45).
- the internal heat exchanger (45) heat is exchanged between the liquid refrigerant flowing into the first flow path (46) from the bottom of the gas-liquid separator (35) and the refrigerant flowing into the second flow path (47). Is done.
- the refrigerant in the first flow path (46) is cooled by the refrigerant in the second flow path (47) to be in a supercooled state.
- the heat source side circuit (14) is provided with the indication pipe (42).
- the injection pipe (42) has one end connected between the bridge circuit (24) and the inflow side of the expander (31) and the other end downstream of the internal heat exchanger (45) in the gas supply pipe (37). Connected Yes.
- the injection pipe (42) has a return refrigerant expansion valve (5
- the return refrigerant expansion valve (55) is an electronic expansion valve with a variable opening.
- the internal heat exchanger (45) is provided across the gas supply pipe (37), the liquid pipe (38), and the injection pipe (42).
- the internal heat exchanger (45) includes a first flow path (46), a second flow path (47), and a third flow path (48), and the refrigerant in the first flow path (46) is the second flow path. Heat exchange is performed with both the refrigerant of (47) and the refrigerant of the third channel (48).
- the third flow path (48) is a part of the injection pipe (42).
- both or one of the gas refrigerant expansion valve (36) and the return refrigerant expansion valve (55) is opened.
- the gas refrigerant expansion valve (36) is opened, the refrigerant decompressed by the gas refrigerant expansion valve (36) flows into the second flow path (47) as in the first embodiment.
- the return refrigerant expansion valve (55) is opened, a part of the refrigerant condensed in the outdoor heat exchanger (44) flows into the injection pipe (42) and is reduced in pressure by the return refrigerant expansion valve (55). It flows into the channel (48).
- the compressor (30) and the expander (31) are connected to each other by a single drive shaft, and the rotational speed of the compressor (30) and the expander (31) Cannot be adjusted individually. For this reason, in order to appropriately set the operating state (for example, high pressure or low pressure) of the refrigeration cycle, there is a means for adjusting the ratio between the amount of refrigerant passing through the compressor (30) and the amount of refrigerant passing through the expander (31). Necessary.
- the gas refrigerant expansion valve (36) When is opened, the density of the refrigerant sucked into the compressor (30) decreases. As a result, the ratio of the refrigerant amount passing through the compressor (30) and the refrigerant amount passing through the expander (31) can be adjusted to an appropriate state.
- the refrigerant decompressed by the gas refrigerant expansion valve (36) and the return refrigerant expansion valve (55) in the second flow path (47) of the internal heat exchanger (45) may be connected to the upstream side of the internal heat exchanger (45) so that the refrigerant depressurized in step S3 flows in.
- the internal heat exchanger (45) is provided across two pipes, the gas supply pipe (37) and the liquid pipe (38).
- the internal heat exchanger (45) has a third flow path (48).
- a liquid supply pipe (52) is provided between the liquid pipe (38) and the gas supply pipe (37).
- the liquid supply pipe (52) has one end connected downstream of the internal heat exchanger (45) in the liquid pipe (38), and the other end connected to the gas refrigerant expansion valve (36) in the gas supply pipe (37) and the internal heat.
- the liquid supply pipe (52) is provided with a liquid refrigerant expansion valve (53) which is a liquid refrigerant decompression mechanism.
- the liquid refrigerant expansion valve (53) is an electronic expansion valve with a variable opening.
- the internal heat exchanger (45), the gas refrigerant expansion valve (36), and the liquid refrigerant expansion valve (53) constitute the cooling means (36, 45, 53) according to the present invention. ing. One end of the liquid supply pipe (52) is connected to the upstream side of the internal heat exchanger (45) in the liquid pipe (38).
- both or one of the gas refrigerant expansion valve (36) and the liquid refrigerant expansion valve (53) is opened.
- the gas refrigerant expansion valve (36) is opened, the refrigerant decompressed by the gas refrigerant expansion valve (36) flows into the second flow path (47) as in the first embodiment.
- the liquid refrigerant expansion valve (53) is opened, part of the liquid refrigerant from the gas-liquid separator (35) to the indoor circuit (11) is transferred to the liquid supply pipe (52 ).
- the liquid refrigerant flowing into the liquid supply pipe (52) is decompressed by the liquid refrigerant expansion valve (53) and flows into the second flow path (47).
- the third modification it is necessary to adjust the ratio between the amount of refrigerant passing through the compressor (30) and the amount of refrigerant passing through the expander (31). If the amount of refrigerant that can pass through the compressor (30) is less than the amount of refrigerant that can pass through the expander (31) for an appropriate balance of operating conditions, open the liquid refrigerant expansion valve (53). As a result, the density of refrigerant sucked into the compressor (30) increases. As a result, the ratio of the refrigerant amount passing through the compressor (30) and the refrigerant amount passing through the expander (31) can be adjusted to an appropriate state.
- the gas refrigerant expansion valve (36) should be When opened, the density of the refrigerant sucked into the compressor (30) decreases. As a result, the ratio of the amount of refrigerant passing through the compressor (30) and the amount of refrigerant passing through the expander (31) can be adjusted to an appropriate state.
- the other end of the liquid supply pipe (52) may be connected downstream of the internal heat exchanger (45).
- the internal heat exchanger (45) is provided across the gas supply pipe (37), the liquid pipe (38), and the liquid supply pipe (52).
- the liquid supply pipe (52) may be provided in the air conditioner (20) of the second modification.
- the internal heat exchanger (45), the gas refrigerant expansion valve (36), the liquid refrigerant expansion valve (53), and the return refrigerant expansion valve (55) comprise the cooling means (36, 45, 53, 55).
- the cooling operation if all of the gas refrigerant expansion valve ( 36 ), the liquid refrigerant expansion valve ( 53 ), and the return refrigerant expansion valve (55) are opened, a directing force is applied to the indoor circuit (11).
- the liquid refrigerant of (46) is an expansion valve for gas refrigerant ( Heat exchange is performed with the refrigerant whose temperature has been reduced in 36), the refrigerant whose temperature has been reduced by the liquid refrigerant expansion valve (53), and the refrigerant whose temperature has been reduced by the return refrigerant expansion valve (55).
- the air conditioner (20) of the second embodiment is similar to the first embodiment in the refrigeration apparatus according to the present invention.
- the outdoor circuit (14) of the second embodiment is not provided with a gas-liquid separator (35).
- the outflow side of the expander (31) is connected to the bridge circuit (24) via the cooling pipe (49) passing through the internal heat exchanger (28), which is a supercooling heat exchanger. It is connected.
- One end of an injection pipe (42) is connected upstream of the internal heat exchanger (28) in the cooling pipe (49).
- the other end of the instruction pipe (42) is connected to the suction side of the compressor (30).
- the injection pipe (42) is provided with a return refrigerant expansion valve (55) which is a return refrigerant decompression mechanism.
- the return refrigerant expansion valve (55) is an electronic expansion valve with a variable opening.
- the internal heat exchanger (28) is provided across the injection pipe (42) and the cooling pipe (49).
- the internal heat exchanger (28) includes a first flow path (46) that is a part of the cooling pipe (49) and a second flow path (47) that is a part of the injection pipe (42). ing.
- the refrigerant in the first flow path (46) and the refrigerant in the second flow path (47) exchange heat so that the refrigerant in the first flow path (46) is supercooled. It is configured to be.
- the return refrigerant expansion valve (55) is opened.
- the return refrigerant expansion valve (55) is opened, part of the directional liquid refrigerant flows from the expander (31) into the indoor circuit (11) into the injection pipe (42).
- the liquid refrigerant flowing into the injection pipe (42) is decompressed by the return refrigerant expansion valve (55) and flows into the second flow path (47).
- the refrigerant in the first channel (46) and the refrigerant in the second channel (47) that have flowed out of the expander (31) exchange heat.
- the refrigerant in the first flow path (46) directed to the indoor circuit (11) becomes supercooled.
- an outdoor expansion valve (43) having a variable opening degree may be provided between the outdoor heat exchanger (44) and the bridge circuit (24).
- the outdoor expansion valve (43) is fully opened during cooling operation.
- the degree of opening of the outdoor expansion valve (43) is adjusted in order to adjust the degree of superheat of the refrigerant going to the compressor (30).
- an outdoor expansion valve (43) having a variable opening may be provided instead of the check valve (CV-4).
- the outdoor expansion valve (43) is fully closed during cooling operation.
- the opening degree of the outdoor expansion valve (43) is adjusted so that the degree of superheat of the refrigerant going to the compressor (30) becomes constant.
- the outflow side of the expander (31) is connected to the inflow of the first check valve (CV-1) and the fourth check valve (CV-4) of the bridge circuit (24).
- the bottom of the gas-liquid separator (35) to the outflow side of the first check valve (CV-1) and the inflow side of the second check valve (CV-2) in the bridge circuit (24) You may connect.
- the liquid pipe (38) to the first shut-off valve (17).
- the baffle plate (39) is erected from the bottom surface of the gas-liquid separator (35). The baffle plate (39) is provided between a position where the liquid pipe (38) is opened and a position where the refrigerant pipe from the bridge circuit (24) is opened.
- the gas-liquid two-phase refrigerant flows from the bridge circuit (24) during the cooling operation, but the baffle plate (39) causes the gas refrigerant to flow out of the liquid pipe (38) due to the liquid refrigerant. Can be prevented.
- the gas supply pipe (37) may be connected so as to open to a space in the middle of the compression stroke on the suction side of the compressor (30).
- the indication pipe (42) may be similarly connected.
- the compressor (30) may be composed of a low-stage compression mechanism (30a) and a high-stage compression mechanism (30b).
- the low-stage compression mechanism (30a) and the high-stage compression mechanism (30b) are connected in series with each other. That is, the compressor (30) is configured to perform two-stage compression in which the high-stage compression mechanism (30b) sucks and further compresses the refrigerant compressed by the low-stage compression mechanism (30a).
- the gas supply pipe (37) may be connected to the suction side of the high stage compression mechanism (30b).
- the injection pipe (42) may be similarly connected.
- the number of indoor units (61) may be one instead of a plurality.
- the indoor expansion valve (51) may not be provided in the indoor unit (61).
- the liquid single-phase refrigerant flows into the indoor heat exchanger (41). Therefore, when the indoor heat exchanger (41) is configured by heat transfer tubes arranged in a plurality of paths, it is possible to prevent the refrigerant state from being biased depending on the position of the heat transfer tubes.
- the present invention is a refrigeration capable of performing a cooling operation in which the refrigerant is circulated in the refrigerant circuit so that the heat source side heat exchanger serves as a condenser and the use side heat exchanger serves as an evaporator. Useful for equipment.
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Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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AU2007262044A AU2007262044B2 (en) | 2006-06-21 | 2007-06-20 | Refrigeration system |
EP07767269.9A EP2034255B1 (en) | 2006-06-21 | 2007-06-20 | Refrigeration device |
ES07767269T ES2699623T3 (es) | 2006-06-21 | 2007-06-20 | Dispositivo de refrigeración |
US12/305,647 US8166771B2 (en) | 2006-06-21 | 2007-06-20 | Refrigeration system |
CN2007800233635A CN101473173B (zh) | 2006-06-21 | 2007-06-20 | 冷冻装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006-171882 | 2006-06-21 | ||
JP2006171882A JP2008002742A (ja) | 2006-06-21 | 2006-06-21 | 冷凍装置 |
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WO2007148727A1 true WO2007148727A1 (ja) | 2007-12-27 |
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PCT/JP2007/062431 WO2007148727A1 (ja) | 2006-06-21 | 2007-06-20 | 冷凍装置 |
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US (1) | US8166771B2 (ja) |
EP (1) | EP2034255B1 (ja) |
JP (1) | JP2008002742A (ja) |
KR (1) | KR101044464B1 (ja) |
CN (2) | CN101473173B (ja) |
AU (1) | AU2007262044B2 (ja) |
ES (1) | ES2699623T3 (ja) |
WO (1) | WO2007148727A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2270405A1 (en) * | 2008-03-31 | 2011-01-05 | Daikin Industries, Ltd. | Refrigerating device |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE531701C2 (sv) * | 2007-11-05 | 2009-07-14 | Alfa Laval Corp Ab | Vätskeavskiljare till ett förångningssystem |
JP5865381B2 (ja) * | 2011-09-30 | 2016-02-17 | 三菱電機株式会社 | 空気調和装置 |
JP5825042B2 (ja) * | 2011-10-25 | 2015-12-02 | ダイキン工業株式会社 | 冷凍装置 |
JP6064744B2 (ja) * | 2013-03-29 | 2017-01-25 | 株式会社富士通ゼネラル | 冷凍サイクル装置 |
JP2014132217A (ja) * | 2014-04-17 | 2014-07-17 | Topre Corp | 三重管式熱交換器を用いた冷凍装置 |
JP6643630B2 (ja) * | 2016-02-17 | 2020-02-12 | パナソニックIpマネジメント株式会社 | 空気調和装置 |
CN114251862A (zh) * | 2020-09-24 | 2022-03-29 | 北京市京科伦工程设计研究院有限公司 | 单级二氧化碳多联机冷热多功能中央空调 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11118266A (ja) * | 1997-10-21 | 1999-04-30 | Daikin Ind Ltd | 冷媒回路 |
JP2003074999A (ja) * | 2001-08-31 | 2003-03-12 | Daikin Ind Ltd | 冷凍機 |
JP2003074990A (ja) * | 2001-08-31 | 2003-03-12 | Daikin Ind Ltd | 冷凍装置 |
JP2003121018A (ja) * | 2001-10-09 | 2003-04-23 | Daikin Ind Ltd | 冷凍装置 |
JP2006071137A (ja) | 2004-08-31 | 2006-03-16 | Daikin Ind Ltd | 冷凍装置 |
JP2006125791A (ja) * | 2004-11-01 | 2006-05-18 | Hitachi Ltd | 空気調和装置 |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE137744T1 (de) * | 1983-09-20 | 1986-10-16 | Costain Petrocarbon Ltd., Manchester | Trennung von kohlenwasserstoffgemischen. |
GB8703751D0 (en) * | 1987-02-18 | 1987-03-25 | Costain Petrocarbon | Separation of hydrocarbon mixtures |
JPH0420749A (ja) * | 1990-05-15 | 1992-01-24 | Mitsubishi Electric Corp | 空気調和機 |
JP2800428B2 (ja) * | 1991-01-30 | 1998-09-21 | ダイキン工業株式会社 | 空気調和装置 |
JP3275559B2 (ja) * | 1994-09-20 | 2002-04-15 | 株式会社日立製作所 | 冷凍装置 |
JP3435848B2 (ja) * | 1994-10-25 | 2003-08-11 | 株式会社日本自動車部品総合研究所 | 冷凍サイクル |
JPH11142007A (ja) * | 1997-11-06 | 1999-05-28 | Nippon Soken Inc | 冷凍サイクル |
JP2001317832A (ja) * | 2000-05-10 | 2001-11-16 | Daikin Ind Ltd | 空気調和装置 |
WO2002046663A1 (fr) * | 2000-12-08 | 2002-06-13 | Daikin Industries, Ltd. | Refrigerateur |
US7591150B2 (en) * | 2001-05-04 | 2009-09-22 | Battelle Energy Alliance, Llc | Apparatus for the liquefaction of natural gas and methods relating to same |
US7637122B2 (en) * | 2001-05-04 | 2009-12-29 | Battelle Energy Alliance, Llc | Apparatus for the liquefaction of a gas and methods relating to same |
US6581409B2 (en) * | 2001-05-04 | 2003-06-24 | Bechtel Bwxt Idaho, Llc | Apparatus for the liquefaction of natural gas and methods related to same |
US20040151958A1 (en) * | 2003-01-31 | 2004-08-05 | Volker Formanski | Fuel cell system with recuperative heat exchanger |
JP4321095B2 (ja) * | 2003-04-09 | 2009-08-26 | 日立アプライアンス株式会社 | 冷凍サイクル装置 |
US7357003B2 (en) * | 2003-07-24 | 2008-04-15 | Toyo Engineering Corporation | Process and apparatus for separation of hydrocarbons |
US7183328B2 (en) * | 2003-12-17 | 2007-02-27 | Exxonmobil Chemical Patents Inc. | Methanol manufacture using pressure swing reforming |
JP2006038386A (ja) * | 2004-07-29 | 2006-02-09 | Daikin Ind Ltd | 冷却装置 |
JP2006071174A (ja) * | 2004-09-01 | 2006-03-16 | Daikin Ind Ltd | 冷凍装置 |
JP2007083122A (ja) * | 2005-09-20 | 2007-04-05 | Central Res Inst Of Electric Power Ind | 液化物を用いた含水物質の脱水方法 |
-
2006
- 2006-06-21 JP JP2006171882A patent/JP2008002742A/ja active Pending
-
2007
- 2007-06-20 AU AU2007262044A patent/AU2007262044B2/en not_active Ceased
- 2007-06-20 KR KR1020087031583A patent/KR101044464B1/ko not_active IP Right Cessation
- 2007-06-20 CN CN2007800233635A patent/CN101473173B/zh active Active
- 2007-06-20 WO PCT/JP2007/062431 patent/WO2007148727A1/ja active Application Filing
- 2007-06-20 US US12/305,647 patent/US8166771B2/en active Active
- 2007-06-20 EP EP07767269.9A patent/EP2034255B1/en active Active
- 2007-06-20 ES ES07767269T patent/ES2699623T3/es active Active
- 2007-06-20 CN CN2010101571238A patent/CN101832674B/zh active Active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11118266A (ja) * | 1997-10-21 | 1999-04-30 | Daikin Ind Ltd | 冷媒回路 |
JP2003074999A (ja) * | 2001-08-31 | 2003-03-12 | Daikin Ind Ltd | 冷凍機 |
JP2003074990A (ja) * | 2001-08-31 | 2003-03-12 | Daikin Ind Ltd | 冷凍装置 |
JP2003121018A (ja) * | 2001-10-09 | 2003-04-23 | Daikin Ind Ltd | 冷凍装置 |
JP2006071137A (ja) | 2004-08-31 | 2006-03-16 | Daikin Ind Ltd | 冷凍装置 |
JP2006125791A (ja) * | 2004-11-01 | 2006-05-18 | Hitachi Ltd | 空気調和装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2270405A1 (en) * | 2008-03-31 | 2011-01-05 | Daikin Industries, Ltd. | Refrigerating device |
EP2270405A4 (en) * | 2008-03-31 | 2014-06-18 | Daikin Ind Ltd | REFRIGERATION DEVICE |
Also Published As
Publication number | Publication date |
---|---|
CN101832674B (zh) | 2012-08-08 |
EP2034255B1 (en) | 2018-09-05 |
US20100000248A1 (en) | 2010-01-07 |
KR101044464B1 (ko) | 2011-06-27 |
US8166771B2 (en) | 2012-05-01 |
AU2007262044B2 (en) | 2010-09-16 |
CN101832674A (zh) | 2010-09-15 |
KR20090015148A (ko) | 2009-02-11 |
EP2034255A1 (en) | 2009-03-11 |
CN101473173A (zh) | 2009-07-01 |
JP2008002742A (ja) | 2008-01-10 |
ES2699623T3 (es) | 2019-02-12 |
AU2007262044A1 (en) | 2007-12-27 |
EP2034255A4 (en) | 2014-08-20 |
CN101473173B (zh) | 2010-08-18 |
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