WO2005121656A1 - 空気調和装置 - Google Patents
空気調和装置 Download PDFInfo
- Publication number
- WO2005121656A1 WO2005121656A1 PCT/JP2005/010673 JP2005010673W WO2005121656A1 WO 2005121656 A1 WO2005121656 A1 WO 2005121656A1 JP 2005010673 W JP2005010673 W JP 2005010673W WO 2005121656 A1 WO2005121656 A1 WO 2005121656A1
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- WO
- WIPO (PCT)
- Prior art keywords
- refrigerant
- communication pipe
- pipe
- unit
- heat source
- 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
- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/006—Compression machines, plants or systems with reversible cycle not otherwise provided for two pipes connecting the outdoor side to the indoor side with multiple indoor units
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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
- F25B2313/025—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor units
- F25B2313/0253—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple outdoor 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
- 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
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
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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
- F25B2500/00—Problems to be solved
- F25B2500/01—Geometry problems, e.g. for reducing size
Definitions
- the present invention relates to an air conditioner, particularly to a separate type air conditioner in which a heat source unit and a utilization unit are connected via a refrigerant communication pipe.
- a heat source unit having a compressor and a heat source side heat exchanger, a use unit having a use side expansion mechanism and a use side heat exchange, and a liquid refrigerant communication connecting the heat source unit and the use unit
- a separate type air conditioner including a pipe and a gas refrigerant communication pipe.
- a heat source unit is installed on the roof of a building, and a heat source unit and a usage unit are separated from each other, as in a case where a usage unit is installed on each floor of a building.
- the connecting pipe and gas refrigerant connecting pipe must be lengthened (hereinafter referred to as connecting a long pipe).
- the pressure loss of the refrigerant flowing through the liquid refrigerant communication pipe and the gas refrigerant communication pipe becomes large.
- the liquid refrigerant communication pipe is directed from the heat source unit to the utilization unit.
- Patent document 1 JP-A-9152195
- An object of the present invention is to prevent performance degradation when a long pipe is connected in a separate type air conditioner in which a heat source unit and a utilization unit are connected via a refrigerant communication pipe.
- An air conditioner includes a heat source unit, a utilization unit, a liquid refrigerant communication pipe and a gas refrigerant communication pipe, and a communication pipe refrigerant cooling unit.
- the heat source unit has a compressor and a heat source side heat exchanger.
- the utilization unit has a utilization side expansion mechanism and a utilization side heat exchanger.
- the liquid refrigerant communication pipe and the gas refrigerant communication pipe connect the heat source unit and the utilization unit.
- the communication pipe refrigerant cooling unit has a branch pipe, a branch pipe expansion mechanism, and a cooler, and is connected to the liquid refrigerant communication pipe near the heat source unit.
- the branch pipe branches a part of the liquid refrigerant flowing in the liquid refrigerant communication pipe from the heat source unit to the utilization unit and joins the gas refrigerant communication pipe.
- the branch pipe expansion mechanism reduces the pressure of the refrigerant flowing through the branch pipe.
- the cooler cools the liquid refrigerant flowing through the liquid refrigerant communication pipe by the refrigerant depressurized by the branch pipe expansion mechanism.
- the connecting pipe refrigerant cooling unit is connected near the heat source unit of the liquid refrigerant connecting pipe, for example, as in the cooling operation, the refrigerant is supplied to the compressor and the heat source side heat exchanger.
- liquid refrigerant communication pipe, user side expansion mechanism, user side heat exchanger, gas refrigerant communication pipe and compressor A part of the liquid refrigerant flowing through the liquid refrigerant communication pipe from the heat source unit to the utilization unit is branched from the liquid refrigerant communication pipe by the branch pipe forming the communication pipe refrigerant cooling unit, thereby expanding the branch pipe.
- the degree of supercooling can be increased, so that even if the flow rate of the refrigerant flowing through the use side heat exchanger decreases, In addition, it is possible to maintain the necessary capacity in the user side heat exchange ⁇ as much as possible.
- the connection of the liquid refrigerant communication pipe from the connection of the refrigerant cooling unit to the communication pipe of the gas refrigerant communication pipe via the usage unit and the connection to the refrigerant cooling unit Since the pressure loss in the flow path up to the point can be reduced, it is possible to prevent a decrease in performance when a long pipe is connected.
- the connecting pipe refrigerant cooling unit is a separate unit from the heat source unit and the utilization unit, it can be easily retrofitted to an existing air conditioner or the like.
- An air conditioner includes a plurality of heat source units, a utilization unit, a liquid refrigerant communication pipe and a gas refrigerant communication pipe, and a communication pipe refrigerant cooling unit.
- the heat source unit has a compressor and heat source side heat exchange.
- the use unit has a use-side expansion mechanism and a use-side heat exchanger!
- the liquid refrigerant communication pipe and the gas refrigerant communication pipe connect the plurality of heat source units and also connect the plurality of heat source units and the utilization unit.
- the communication pipe refrigerant cooling unit has a branch pipe, a branch pipe expansion mechanism, and a cooler, and is a portion of the liquid refrigerant communication pipe where all of the refrigerant flowing from each heat source unit to the utilization unit merges. And a portion of the gas refrigerant communication pipe where the refrigerant flowing from the utilization unit toward the plurality of heat source units starts branching to each heat source unit.
- the branch pipe branches a portion of the liquid refrigerant flowing in the liquid refrigerant communication pipe near the portion where all of the refrigerant flowing from each heat source unit toward the utilization unit joins and joins the gas refrigerant communication pipe.
- the branch pipe expansion mechanism reduces the pressure of the refrigerant flowing through the branch pipe.
- the cooler cools the liquid refrigerant flowing through the liquid refrigerant communication pipe with the refrigerant depressurized in the branch pipe expansion mechanism.
- the liquid refrigerant communication pipe is located near a portion where all of the refrigerant flowing from each heat source unit toward the use unit is joined, and the gas refrigerant communication pipe has a gas refrigerant communication pipe.
- the refrigerant is supplied to the compressor, heat source side heat exchanger, liquid refrigerant communication pipe, user side expansion mechanism, user side heat exchanger, gas refrigerant communication pipe, and compressor.
- the branch pipes constituting the connecting pipe refrigerant cooling unit When circulating sequentially, the branch pipes constituting the connecting pipe refrigerant cooling unit also exert a force near the part where all of the refrigerant flowing from the multiple heat source units to the utilization unit merges, as well as the liquid refrigerant flowing through the liquid refrigerant connecting pipe.
- the connection unit of the communication pipe refrigerant cooling unit of the liquid refrigerant communication pipe allows the utilization unit to be removed. It is possible to reduce the flow rate of the refrigerant flowing through the flow path from the gas refrigerant communication pipe to the connection section with the communication pipe refrigerant cooling unit.
- the degree of supercooling can be increased by cooling the liquid refrigerant flowing through the liquid refrigerant communication pipe by using the refrigerant decompressed in the branch pipe expansion mechanism by the cooler, thereby increasing the degree of subcooling. Even if the flow rate decreases, it is possible to maintain the necessary capacity in the user-side heat exchange as much as possible.
- the connection of the liquid refrigerant communication pipe from the connection of the refrigerant cooling unit to the communication pipe of the gas refrigerant communication pipe via the usage unit and the connection to the refrigerant cooling unit Since the pressure loss in the flow path up to the point can be reduced, it is possible to prevent a decrease in performance when a long pipe is connected.
- the connecting pipe refrigerant cooling unit is a separate unit from the heat source unit and the utilization unit, it can be easily retrofitted to an existing air conditioner or the like.
- An air conditioner pertaining to a third invention is the air conditioner pertaining to the first or second invention, wherein the branch pipe expansion mechanism is a temperature-sensitive cylinder type expansion valve.
- a temperature-sensitive cylinder type expansion valve is used as the branch pipe expansion mechanism, which eliminates the need for a power supply for the connecting pipe refrigerant cooling unit, thereby reducing the cost of the connecting pipe refrigerant cooling unit and improving on-site workability.
- An air conditioner according to a fourth invention is the air conditioner according to any of the first to third inventions, wherein the branch pipe has a refrigerant flowing from the liquid refrigerant communication pipe to the gas refrigerant communication pipe.
- Check valve connected to allow only the flow of water! Puru.
- a check valve that allows only the flow of the refrigerant flowing from the liquid refrigerant communication pipe to the gas refrigerant communication pipe is connected to the branch pipe.
- FIG. 1 is a schematic refrigerant circuit diagram of an air conditioner according to one embodiment of the present invention.
- FIG. 2 is a view showing the vicinity of a connection portion between a refrigerant cooling unit and a refrigerant communication pipe.
- FIG. 3 is a Mollier chart showing a refrigeration cycle during a cooling operation of the air conditioner.
- FIG. 4 is a schematic refrigerant circuit diagram of an air conditioner of Conventional Example 1 (when a connecting pipe refrigerant cooling unit is connected near a use unit).
- FIG. 5 is a schematic refrigerant circuit diagram of an air conditioner of Conventional Example 2 (in which the connecting pipe refrigerant cooling unit is not connected!).
- FIG. 6 is a view showing a refrigerant cooling unit for a communication pipe working in a modified example of the present invention.
- FIG. 7 is a view showing a communication pipe refrigerant cooling unit according to a modification of the present invention.
- FIG. 8 is a view showing a communication pipe refrigerant cooling unit according to a modification of the present invention.
- FIG. 9 is a schematic refrigerant circuit diagram of an air conditioner of another embodiment.
- FIG. 10 is a view showing the vicinity of a connection part between a refrigerant cooling unit and a refrigerant communication pipe, which is used in another embodiment.
- Branch pipe expansion valve (Branch pipe expansion mechanism)
- FIG. 1 is a schematic refrigerant circuit diagram of an air conditioner 1 according to one embodiment of the present invention.
- the air conditioner 1 is a device used for indoor cooling and heating of a building or the like by performing a vapor compression refrigeration cycle operation.
- the air conditioner 1 mainly includes one heat source unit 2, one use unit 5, a liquid refrigerant communication pipe 6 for connecting the heat source unit 2 and the use unit 5, and a gas refrigerant communication pipe 7. ing. That is, the vapor compression type refrigerant circuit 10 of the air conditioner 1 of the present embodiment is configured by connecting the heat source unit 2, the use unit 5, the liquid refrigerant communication pipe 6, and the gas refrigerant communication pipe 7. Have been.
- the use unit 5 is installed by being embedded or suspended in an indoor ceiling of a building or the like, or mounted on an indoor wall surface.
- the utilization unit 5 is connected to the heat source unit 2 via a liquid refrigerant communication pipe 6 and a gas refrigerant communication pipe 7, and forms a part of the refrigerant circuit 10.
- the usage unit 5 mainly includes a usage-side refrigerant circuit 10a that forms a part of the refrigerant circuit 10.
- the use side refrigerant circuit 10a mainly includes a use side expansion valve 51 (use side expansion mechanism) and a use side heat exchange 52.
- the use-side expansion valve 51 is a refrigerant flowing in the use-side refrigerant circuit 10a.
- the electric expansion valve is connected to the liquid side of the use side heat exchanger 52 in order to adjust the flow rate of the water.
- the use-side heat exchange is a cross-fin type fin-and-tube heat exchanger composed of heat transfer tubes and a large number of fins, and functions as a refrigerant evaporator during cooling operation.
- This is a heat exchanger that cools indoor air by heating, and functions as a refrigerant condenser during heating operation to heat indoor air.
- the usage unit 5 includes an indoor fan (not shown) for inhaling indoor air into the unit, exchanging heat, and then supplying the indoor air as supply air. It is possible to exchange heat with the refrigerant flowing through the use side heat exchange.
- the heat source unit 2 is installed on the roof of a building or the like, and is connected to the use unit 5 via the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7, and a refrigerant circuit 10 is configured between the use units 5. are doing.
- the heat source unit 2 mainly includes a heat source side refrigerant circuit 10b that forms a part of the refrigerant circuit 10.
- the heat-source-side refrigerant circuit 10b mainly includes a compressor 21, a four-way switching valve 22, a heat-source-side heat exchanger 23, a liquid-side shutoff valve 24, and a gas-side shutoff valve 25.
- the compressor 21 is a positive displacement compressor.
- the power of the compressor 21 is only one.
- the present invention is not limited to this. Two or more compressors are connected in parallel according to the number of connected units and the like. Is also good.
- the four-way switching valve 22 is a valve for switching the direction of the flow of the refrigerant.
- the four-way switching valve 22 converts the heat source side heat exchange 23 as a condenser for the refrigerant compressed in the compressor 21 and uses the user side heat exchange.
- the heat exchanger 52 In order for the heat exchanger 52 to function as an evaporator for the refrigerant condensed in the heat source side heat exchanger 23, the discharge side of the compressor 21 and the gas side of the heat source side heat exchange 23 are connected, and the compressor 21 is connected to the suction side. It is connected to the gas refrigerant communication pipe 7 (see the solid line of the four-way switching valve 22 in FIG.
- the use side heat exchanger 52 is used as a condenser for the refrigerant compressed in the compressor 21, and in order to make the heat source side heat exchange 23 function as an evaporator for the refrigerant condensed in the use side heat exchange ⁇ , the gas refrigerant is connected to the discharge side of the compressor 21. It is possible to connect the pipe 7 side and connect the suction side of the compressor 21 and the gas side of the heat source side heat exchange 23 (see the broken line of the four-way switching valve 22 in FIG. 1).
- the heat source side heat exchange is a cross-fin type fin-and-tube heat exchanger composed of a heat transfer tube and a large number of fins, and uses water or outdoor air as a heat source.
- the heat exchanger functions as a refrigerant condenser during the cooling operation and functions as a refrigerant evaporator during the heating operation.
- the heat source side heat exchanger 23 has a gas side connected to the four-way switching valve 22 and a liquid side connected to the liquid refrigerant communication pipe 6.
- the liquid-side stop valve 24 and the gas-side stop valve 25 are valves provided at the connection ports with external devices and pipes (specifically, the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7).
- the liquid side closing valve 24 is connected to the heat source side heat exchange 23.
- the gas side shut-off valve 25 is connected to the four-way switching valve 22.
- the use-side refrigerant circuit 10a, the heat-source-side refrigerant circuit 10b, and the refrigerant communication pipes 6, 7 are connected to form the refrigerant circuit 10 of the air conditioner 1. Then, the air-conditioning apparatus 1 of the present embodiment can operate by switching between the cooling operation and the heating operation by the four-way switching valve 22.
- the air conditioner 1 of the present embodiment further includes a communication pipe refrigerant cooling unit 8 connected to the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 near the heat source unit 2.
- ⁇ near the heat source unit 2 '' refers to at least a position closer to the heat source unit 2 than an intermediate position of the total length TL of the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7, and as shown in FIG. It is desirable that the connecting pipe refrigerant cooling unit 8 be disposed adjacent to the heat source unit 2 and connected to the liquid refrigerant connecting pipe 6 and the gas refrigerant connecting pipe 7.
- the communication pipe refrigerant cooling unit 8 mainly includes a liquid refrigerant main pipe 81 functioning as a part of the liquid refrigerant communication pipe 6, a gas refrigerant main pipe 82 functioning as a part of the gas refrigerant communication pipe 7, and a liquid refrigerant main pipe.
- a branch pipe 83 connected so as to branch a part of the liquid refrigerant flowing from the liquid refrigerant communication pipe 6 into the liquid refrigerant communication pipe 6 and join the gas refrigerant main pipe 82, and a refrigerant connected to the branch pipe 83 and flowing through the branch pipe 83
- a branch pipe expansion valve 84 (branch pipe expansion mechanism) for reducing pressure
- a cooler 85 that cools the liquid refrigerant flowing through the liquid refrigerant communication pipe 6 (specifically, the main liquid refrigerant pipe 81) by the refrigerant decompressed at the branch pipe expansion valve 84, and a liquid refrigerant communication pipe connected to the branch pipe 83 6
- a check valve 86 that allows only the flow of the refrigerant directed from the liquid refrigerant main pipe 81 to the gas refrigerant communication pipe 7 (specifically, the gas refrigerant main pipe 82). are doing.
- the liquid refrigerant main pipe 81 is a refrigerant pipe having two connection ports 8a and 8b that are connected so as to cut into a portion of the liquid refrigerant communication pipe 6 near the heat source unit 2.
- the gas refrigerant main pipe 82 is a refrigerant pipe having two connection ports 8c and 8d that are connected so as to be inserted into a portion of the gas refrigerant communication pipe 7 near the heat source unit 2.
- the branch pipe expansion valve 84 is formed of a temperature-sensitive cylinder type expansion valve, and can be controlled so that the superheat degree at the outlet of the refrigerant flowing through the branch pipe 83 of the cooler 85 becomes a predetermined value. It is. That is, the valve body 84a of the branch pipe expansion valve 84 is connected to the inlet side of the cooler 85 of the branch pipe 83, and the thermosensitive cylinder 84b is attached to the outlet side of the cooler 85 of the branch pipe 83.
- the cooler 85 also has a double pipe heat exchanger, a plate heat exchanger, and the like, and is connected to the liquid refrigerant main pipe 81 and the branch pipe 83.
- the flow path of the cooler 85 is formed such that the refrigerant flowing on the liquid refrigerant main pipe 81 side and the refrigerant flowing on the branch pipe 83 side flow in parallel.
- the branch pipe 83 is branched from a branch portion 81a of the liquid refrigerant main pipe 81 located closer to the heat source unit 2 than a position where the cooler 85 is connected to the liquid refrigerant main pipe 81.
- the type of heat exchange of the cooler 85 is not limited to the above, but for the sake of compactness of the entire communication pipe refrigerant cooling unit 8, a double pipe heat exchanger or a plate heat exchanger is required. It is desirable to use
- the check valve 86 is located at a position where the temperature-sensitive tube 84b of the branch pipe expansion valve 84 of the branch pipe 83 is attached and at a position where the branch pipe 83 joins the gas refrigerant main pipe 82. It is connected between part 82a.
- connecting pipe refrigerant cooling unit 8 is a separate unit from the heat source unit 2 and the utilization unit 5, it can be easily retrofitted to an existing air conditioner or the like.
- FIG. 3 is a Mollier chart showing a refrigeration cycle during the cooling operation of the air conditioner 1.
- the four-way switching valve 22 is in the state shown by the solid line in FIG. 1, that is, the discharge side of the compressor 21 is connected to the gas side of the heat source side heat exchanger 23, and the suction side of the compressor 21 is not in use. It is connected to the gas side of the utility side heat exchange.
- the liquid-side stop valve 24 and the gas-side stop valve 25 are opened, and the use-side expansion valve 51 is a refrigerant flowing into the use-side heat exchanger 52 according to the load on the air-conditioned space in which the use unit 5 is installed. The opening is adjusted so as to control the flow rate.
- the branch pipe expansion valve 84 of the connecting pipe refrigerant cooling unit 8 controls the degree of superheat of the refrigerant at the outlet of the cooler 85 on the branch pipe 83 side to a predetermined value.
- the high-pressure gas refrigerant is sent to the heat source side heat exchange via the four-way switching valve 22 and exchanges heat with water or outdoor air as a heat source to be condensed and saturated or slightly supercooled ( It becomes a high-pressure liquid refrigerant with a supercooling degree SC in Fig. 3 (see point C in Figs. 1 and 3).
- the high-pressure liquid refrigerant is sent to the connection port 8a of the communication pipe refrigerant cooling unit 8 via the liquid side shut-off valve 24 and the portion of the liquid refrigerant communication pipe 6 near the heat source cutout 2.
- a part of the high-pressure liquid refrigerant sent to the communication pipe refrigerant cooling unit 8 is branched into the branch pipe 83, then flows into the cooler 85, and is branched into the branch pipe 83, and then the branch pipe expansion valve.
- the refrigerant is further subcooled by the wet refrigerant depressurized by 84 (see point D and subcooling SC in FIG. 3).
- the refrigerant flowing through the branch pipe 83 that has exchanged heat with the high-pressure liquid refrigerant flowing through the liquid refrigerant communication pipe 6 (specifically, the main liquid refrigerant pipe 81) flows through the cooler 85. After being evaporated and heated to a predetermined degree of superheat, it passes through the check valve 86 and joins the gas refrigerant communication pipe 7 (specifically, the gas refrigerant main pipe 82). It is.
- the high-pressure liquid refrigerant having an increased degree of subcooling is supplied from the connection pipe 8 of the liquid refrigerant communication pipe 6 to the connection port 8b of the refrigerant cooling unit 8 via the portion on the usage unit 5 side, and then to the usage unit 5 Sent to At this time, the pressure of the high-pressure liquid refrigerant decreases due to the pressure loss corresponding to the length of the liquid refrigerant communication pipe 6, and at the time when the refrigerant flows into the use unit 5 (see point E in FIGS. 1 and 3), As shown in the figure, the pressure is lower by the pressure loss ⁇ ⁇ ⁇ ⁇ ⁇ in the liquid refrigerant communication pipe 6.
- the high-pressure liquid refrigerant sent to the use unit 5 is decompressed by the use-side expansion valve 51 and becomes a low-pressure gas-liquid two-phase refrigerant with a pressure P (see point F in Figs. 1 and 3). ), Is sent to the use-side heat exchanger 52, exchanges heat with indoor air in the use-side heat exchanger 52, and evaporates to become a saturated or slightly overheated low-pressure gas refrigerant (points in Figs. 1 and 3). G).
- the low-pressure gas refrigerant is sent to the connection port 8d of the communication pipe refrigerant cooling unit 8 via the portion of the gas refrigerant communication pipe 7 on the utilization unit 5 side.
- the pressure of the low-pressure gas refrigerant decreases due to the pressure loss corresponding to the length of the gas refrigerant communication pipe 7, and the gas refrigerant flows into the connection port 8d of the communication pipe refrigerant cooling unit 8 (points in FIGS. 1 and 3).
- A) as shown in FIG. 3, the pressure P lower by the pressure loss ⁇ ⁇ ⁇ ⁇ ⁇ in the gas refrigerant communication pipe 7 is reduced.
- the low-pressure gas refrigerant sent to the communication pipe refrigerant cooling unit 8 is branched from the liquid refrigerant communication pipe 6 by the branch pipe 83 together with the refrigerant that has passed through the branch pipe expansion valve 84, the cooler 85, and the check valve 86. From the connection port 8 c of the gas refrigerant communication pipe 7 to the heat source unit 2 via the heat source unit 2 side through the connection port 8 c of the refrigerant cooling unit 8, via the gas side shut-off valve 25 and the four-way switching valve 22 Then, it is sucked into the compressor 21 again.
- the point A ⁇ the point ⁇ the spot ⁇ the point shown in FIG. 3 by the connecting pipe refrigerant cooling unit 8 connected near the heat source unit 2. It is possible to perform a refrigeration cycle operation in which the refrigerant circulates in the order of 0 ⁇ point E ⁇ point ⁇ point 0 ⁇ point 8, and connects the liquid refrigerant communication pipe 6 from the heat source unit 2 through the branch pipe 8 3 of the communication pipe refrigerant cooling unit 8. A part of the flowing refrigerant can be bypassed to the gas refrigerant communication pipe 7, and the degree of supercooling of the refrigerant flowing through the liquid refrigerant communication pipe 6 can be increased. [0024] ⁇ Heating operation>
- the four-way switching valve 22 is in the state shown by the broken line in FIG. 1, that is, the discharge side of the compressor 21 is connected to the gas side of the use side heat exchanger 52, and the suction side of the compressor 21 is heated. It is connected to the gas side of the source side heat exchange.
- the liquid-side stop valve 24 and the gas-side stop valve 25 are opened, and the use-side expansion valve 51 is a refrigerant flowing into the use-side heat exchanger 52 according to the load on the air-conditioned space in which the use unit 5 is installed. The opening is adjusted so as to control the flow rate.
- the branch pipe expansion valve 84 of the connecting pipe refrigerant cooling unit 8 controls the degree of superheat of the refrigerant at the outlet of the cooler 85 on the branch pipe 83 side to a predetermined value.
- the low-pressure gas refrigerant is sucked into the compressor 21 and is compressed to become a high-pressure gas refrigerant.
- the four-way switching valve 22, the gas-side shut-off valve 25 and The gas is sent to the connection port 8c of the refrigerant cooling unit 8 via the portion of the gas refrigerant communication pipe 7 on the heat source unit 2 side.
- the high-pressure gas refrigerant sent to the communication pipe refrigerant cooling unit 8 flows through the gas refrigerant main pipe 82.
- a branch pipe 83 is connected to the gas refrigerant main pipe 82, but the gas refrigerant is binosed from the gas refrigerant main pipe 82 to the liquid refrigerant main pipe 81 by a check valve 86 connected to the branch pipe 83. It's getting better.
- the high-pressure gas refrigerant that has passed through the gas refrigerant main pipe 82 is sent to the usage unit 5 from the connection port 8d of the communication pipe refrigerant cooling unit 8 of the gas refrigerant communication pipe 7 via the portion on the usage unit 5 side. .
- the high-pressure gas refrigerant sent to the use unit 5 exchanges heat with indoor air in the use-side heat exchanger 52 to be condensed into a high-pressure liquid refrigerant.
- the refrigerant is reduced in pressure and becomes a low-pressure gas-liquid two-phase refrigerant.
- the low-pressure gas-liquid two-phase refrigerant is sent to the connection port 8b of the communication pipe refrigerant cooling unit 8 via the liquid refrigerant communication pipe 6.
- the low-pressure gas-liquid two-phase refrigerant sent to the communication pipe refrigerant cooling unit 8 flows through the liquid refrigerant main pipe 81.
- a branch pipe 83 is connected to the liquid refrigerant main pipe 81, Since the refrigerant pressure in the gas refrigerant main pipe 82 is higher than the refrigerant pressure in the liquid refrigerant main pipe 81, the gas refrigerant does not bypass from the gas refrigerant main pipe 82 to the liquid refrigerant main pipe 81.
- the low-pressure gas-liquid two-phase refrigerant that has passed through the liquid refrigerant main pipe 81 passes through the connection port 8a of the connection pipe refrigerant cooling unit 8 of the liquid refrigerant communication pipe 6 via the portion on the heat source unit 2 side. It is sent to the unit 2 and flows into the heat source side heat exchanger 23 via the liquid side closing valve 24.
- the low-pressure gas-liquid two-phase refrigerant that has flowed into the heat source side heat exchanger 23 exchanges heat with water or outdoor air as a heat source and is condensed into a low-pressure gas refrigerant. Via the compressor 21 again.
- the communication pipe refrigerant cooling unit 8 is connected, but unlike the cooling operation, the communication pipe refrigerant cooling unit 8 is not used as described above. Be in state! / Puru.
- the air conditioner 1 of the present embodiment has the following features.
- the connecting pipe refrigerant cooling unit 8 is connected near the heat source unit 2 of the liquid refrigerant connecting pipe 6 and the gas refrigerant connecting pipe 7, for example, as in the cooling operation,
- the refrigerant circulates in the order of compressor 21, heat source side heat exchanger 23, liquid refrigerant communication pipe 6, use side expansion valve 51, use side heat exchanger 52, gas refrigerant communication pipe 7, and compressor 21.
- a part of the liquid refrigerant flowing in the liquid refrigerant communication pipe 6 from the heat source unit 2 to the utilization unit 5 by a branch pipe 83 constituting the communication pipe refrigerant cooling unit 8 is connected to the liquid refrigerant communication pipe 6 (specifically, After branching off from the liquid refrigerant main pipe 81), the refrigerant flowing through the branch pipe 83 is depressurized by the branch pipe expansion valve 84, and then joined to the gas refrigerant communication pipe 7 (specifically, the gas refrigerant main pipe 82).
- connection part of the cooling unit 8 (specifically, the branch part 81a of the main liquid refrigerant pipe 81), via the utilization unit 5, the connection part of the gas refrigerant communication pipe 7 to the communication pipe refrigerant cooling unit 8 (specifically, More specifically, it is possible to reduce the flow rate of the refrigerant flowing through the flow path up to the junction 82a) of the gas refrigerant main pipe 82.
- the branching pipe expansion valve 84 is also cooled by the cooler 85.
- the degree of supercooling can be increased, so that the flow rate of the refrigerant flowing through the use side heat exchanger 52 decreases.
- connection pipe of the gas refrigerant communication pipe 7 from the connection section of the communication pipe refrigerant cooling unit 8 of the liquid refrigerant communication pipe 6 via the usage unit 5 to the communication pipe of the gas refrigerant communication pipe 7 Since the pressure loss in the flow path up to the connection with the cooling unit 8 can be reduced, it is possible to prevent performance degradation when a long pipe is connected.
- the present embodiment shown in FIG. 1 and the conventional example 1 shown in FIG. 4 and FIG. 5 (the connecting pipe refrigerant cooling unit 8 is connected near the use unit 5)
- the air conditioner 101 will be described in comparison with the air conditioner 201 of the conventional example 2 (when the connecting pipe refrigerant cooling unit 8 is not connected).
- the pressure loss (see ⁇ ⁇ in FIG. 3) generated when the liquid refrigerant passes through most of the liquid refrigerant communication pipe 6 is smaller than the pressure loss.
- the liquid refrigerant passes through most of the liquid refrigerant communication pipe 6 in the air conditioner 1 of the present embodiment.
- the high-pressure liquid refrigerant may flash.
- the change of the state of the refrigerant from the point D to the point E is caused by the connection pipe refrigerant cooling unit.
- the high-pressure liquid refrigerant sent to the usage unit 5 is cooled by the branched refrigerant into a supercooled state.
- a flash is generated in the high-pressure liquid refrigerant due to the pressure loss generated when passing through the liquid refrigerant communication pipe 6, and if the refrigerant temperature drops, the communication pipe refrigerant cooling unit 8, the high-pressure liquid refrigerant sent to the usage unit 5 cannot be sufficiently cooled, and is substantially equal to the supercooling degree SC1 (see FIG. 3) of the air conditioner 1 of the present embodiment.
- the enthalpy difference h obtained by the evaporation of the refrigerant in the heat exchange on the user side (that is, the change in the state of the refrigerant from the point F to the point G) is determined in the present embodiment.
- the enthalpy difference h obtained by evaporation of the refrigerant in the use-side heat exchanger 52 in the 2 1 2 state (that is, a change in the state of the refrigerant from the point F to the point G) is equal to or slightly smaller than the use-side heat exchanger 52, If the flow rate of the refrigerant passing through the alternation 52 is substantially the same (that is, the flow rate of the refrigerant bypassed to the gas refrigerant communication pipe 7 through the branch pipe 83 in the communication pipe refrigerant cooling unit 8 ) is equal to the present embodiment.
- the amount of heat exchanged in the use side heat exchanger 52 of the air conditioner 1 of the first example is about the same as or slightly larger than the amount of heat exchanged in the use side heat exchanger 52 of the air conditioner 101 of the first conventional example.
- the state of the refrigerant changing from the point G to the point A is due to the connection pipe refrigerant cooling unit.
- the low-pressure gas refrigerant evaporated in the use-side heat exchange and the low-pressure gas refrigerant combined with the low-pressure gas refrigerant bypassed from the liquid refrigerant communication pipe 6 to the gas refrigerant communication pipe 7 by the branch pipe 83 are combined. This is because the pressure is reduced by the pressure loss (see ⁇ ⁇ in FIG. 3) generated by passing through most of the gas refrigerant communication pipe 7.
- the power consumption W of the compressor 21 is reduced by the air conditioner 1 of the present embodiment.
- the power consumed by the compressor 21 is almost the same, even if the exchanged heat amount in the use side heat exchanger 52 of the air conditioner 101 of the first conventional example and the exchanged heat amount in the use side heat exchange of the air conditioner 1 of the present embodiment are almost the same,
- the COP (coefficient of performance) of the air conditioner 1 of the first example is larger than the COP of the air conditioner 101 of the first conventional example.
- the liquid refrigerant is Pressure loss when passing through most of the air (see ⁇ ⁇ in Figure 3)
- the pressure loss is about the same as, or slightly larger than, the pressure drop.
- the power consumption W of the compressor 21 in the device 1 is larger than the power consumption W of the Even if the amount of heat exchanged in the use-side heat exchanger 52 of 01 and the amount of heat exchanged in the use-side heat exchange of the air conditioner 1 of this embodiment is almost the same, the COP of the air conditioner 1 of this embodiment (performance) Coefficient) is larger than the COP of the air conditioner 201 of the first conventional example.
- the connecting pipe refrigerant cooling unit 8 when the connecting pipe refrigerant cooling unit 8 is connected in the vicinity of the use unit 5 as in the air conditioner 101 of Conventional Example 1, or as in the air conditioner 201 of Conventional Example 2,
- the pressure loss in the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 causes the air conditioner 1 of the present embodiment (the communication pipe cooling medium cooling unit 8 is connected to the heat source unit 2).
- the pressure loss is larger than the pressure loss in the case where it is connected in the vicinity of the refrigerant pipe, so that the degree of subcooling of the liquid refrigerant decreases and the suction pressure of the compressor 21 decreases. It is difficult to prevent the performance from deteriorating.
- the communication pipe refrigerant cooling unit 8 of the present embodiment is a separate unit from the heat source unit 2 and the utilization unit 5, for example, in an existing air conditioner, the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7 It is easy to retrofit when the performance is improved by reducing the pressure loss in.
- the branch pipe expansion valve 84 constituting the connecting pipe refrigerant cooling unit 8 of the present embodiment is a temperature-sensitive cylindrical expansion valve, the connecting pipe refrigerant cooling unit 8 does not require a power source, and the connecting pipe refrigerant cooling unit 8 Cost reduction and on-site workability are improved.
- a check valve 86 that allows only the flow of the refrigerant from the liquid refrigerant communication pipe 6 to the gas refrigerant communication pipe 7 is connected to the branch pipe 83 constituting the communication pipe refrigerant cooling unit 8 of the present embodiment. Therefore, for example, as in the heating operation, the refrigerant flows into the compressor 21, the gas refrigerant communication pipe 7, the use side heat exchanger 52, the use side expansion valve 51, the liquid refrigerant communication pipe 6, the heat source side heat exchanger 23, and the compressor. When circulating in the order of the units 21, the gas refrigerant can be prevented from flowing into the liquid refrigerant communication pipe 6 from the gas refrigerant communication pipe 7 via the branch pipe 83.
- the cooler 85 has a flow path formed so that the refrigerant flowing on the liquid refrigerant main pipe 81 side and the refrigerant flowing on the branch pipe 83 side flow in parallel.
- the refrigerant flowing on the liquid refrigerant main pipe 81 side It has a flow path formed so that the refrigerant flowing in the branch pipe 83 flows in opposition.
- the branch pipe 83 separates the liquid refrigerant flowing in the liquid refrigerant communication pipe 6 from the heat source unit 2 toward the utilization unit 5 so that the upstream force of the cooler 85 also branches. As shown in FIG. 7, it is connected to the liquid refrigerant main pipe 81 so as to branch from the downstream side of the cooler 85, as shown in FIG. 7, or as shown in FIG.
- the branch pipe 83 is connected to the liquid coolant main pipe 81 so that the downstream force of the cooler 85 also branches, and the cooler 85 is connected to the refrigerant flowing through the liquid refrigerant main pipe 81 and the refrigerant flowing through the branch pipe 83. May have a flow path formed so as to flow oppositely.
- the present invention is applied to an air conditioner capable of switching between cooling and heating.
- the present invention is not limited to this. May be applied.
- the check valve provided in the refrigerant cooling unit for the communication pipe can be omitted.
- the present invention is not limited to this, and one heat source unit may be used.
- the present invention may be applied to an air conditioner in which a plurality of use units are connected to an air conditioner, or an air conditioner in which one or more use units are connected to a plurality of heat source units.
- FIGS. 9 and 10 air in which one or more (here, one) use unit 5 is connected to a plurality (here, two) of heat source units 102 is provided.
- the liquid refrigerant communication pipe 6 flows from each heat source unit 102 toward the use unit 5 in a directed manner. Near the part 6a where the refrigerant flowing into the gas refrigerant communication pipe 7 and near the part 7a where the refrigerant flowing toward the two heat source units 102 is branched into each heat source unit 102. May be.
- the refrigerant flowing from the heat source cutout 102 toward the utilization unit 5 is connected to a portion immediately after joining at the junction 6a, and is connected to the gas refrigerant communication pipe 7.
- the refrigerant flowing from the utilization unit 5 to the heat source unit 102 be connected to a portion immediately before branching in the branching section 7a.
- the configuration of the air conditioner 101 is the same as that of the air conditioner 1 described above, except that the air conditioner 101 includes a plurality of heat source units 102.
- the configuration of the communication pipe refrigerant cooling unit 8 is the same as the above-described communication pipe refrigerant cooling unit 8 except for the positions where the connection pipe refrigerant cooling unit 8 is connected to the liquid refrigerant communication pipe 6 and the gas refrigerant communication pipe 7. For this reason, the configurations of the air conditioner 101 and the connecting pipe refrigerant cooling unit 8 are denoted by the same reference numerals as those of the air conditioner 1 and the connecting pipe refrigerant cooling unit 8 described above, and description thereof is omitted.
- the operations of the air conditioner 101 and the connecting pipe refrigerant cooling unit 8 are the same as the above-described operations of the air conditioner and the connecting pipe refrigerant cooling unit 8. For this reason, regarding the operation of the air conditioner 101 and the connecting pipe refrigerant cooling unit 8, the positions of the points C and A (see FIGS. 1 and 3) in the above-described air conditioner 1 The description will be omitted by reading as the position of 6a and the branching portion 7a.
- the capacity of the use side heat exchanger 52 is maintained.
- the pressure in the flow path from the connection of the liquid refrigerant communication pipe 6 to the connection of the refrigerant cooling unit 8 to the connection of the gas refrigerant communication pipe 7 to the connection to the refrigerant cooling unit 8 via the utilization unit 5 Since the loss can be reduced, it is possible to prevent the performance from decreasing when the long pipe is connected.
- the connecting pipe refrigerant cooling unit 8 is placed near the portion 6a of the liquid refrigerant connecting pipe 6 where all the refrigerant flowing from each heat source unit 102 toward the use unit 5 joins, and the gas refrigerant connecting pipe Multiple heat source units 102 from utilization unit 5 out of 7 102 Is connected to the vicinity of the part 7a where the refrigerant flowing toward the heat source unit 102 starts to diverge, minimizing the number of connecting pipe refrigerant cooling units 8 required, increasing the cost and man-hours required for installation Etc. can be suppressed as much as possible.
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Abstract
Description
Claims
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JP2004173840 | 2004-06-11 | ||
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WO2009122512A1 (ja) * | 2008-03-31 | 2009-10-08 | 三菱電機株式会社 | 空気調和装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07120076A (ja) * | 1993-10-20 | 1995-05-12 | Mitsubishi Electric Corp | 空気調和機 |
JP2002243301A (ja) * | 2001-02-14 | 2002-08-28 | Daikin Ind Ltd | 熱交換ユニット及び空気調和装置 |
JP2003130492A (ja) * | 2001-10-18 | 2003-05-08 | Hitachi Ltd | 空気調和機 |
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- 2005-06-10 WO PCT/JP2005/010673 patent/WO2005121656A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07120076A (ja) * | 1993-10-20 | 1995-05-12 | Mitsubishi Electric Corp | 空気調和機 |
JP2002243301A (ja) * | 2001-02-14 | 2002-08-28 | Daikin Ind Ltd | 熱交換ユニット及び空気調和装置 |
JP2003130492A (ja) * | 2001-10-18 | 2003-05-08 | Hitachi Ltd | 空気調和機 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009122512A1 (ja) * | 2008-03-31 | 2009-10-08 | 三菱電機株式会社 | 空気調和装置 |
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