WO2022239212A1 - 空気調和装置、及び空気調和システム - Google Patents
空気調和装置、及び空気調和システム Download PDFInfo
- Publication number
- WO2022239212A1 WO2022239212A1 PCT/JP2021/018305 JP2021018305W WO2022239212A1 WO 2022239212 A1 WO2022239212 A1 WO 2022239212A1 JP 2021018305 W JP2021018305 W JP 2021018305W WO 2022239212 A1 WO2022239212 A1 WO 2022239212A1
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- WIPO (PCT)
- Prior art keywords
- refrigerant
- heat exchanger
- pipe
- auxiliary
- compressor
- Prior art date
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- 238000004378 air conditioning Methods 0.000 title description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000012530 fluid Substances 0.000 claims abstract description 8
- 239000002826 coolant Substances 0.000 claims abstract description 6
- 239000003507 refrigerant Substances 0.000 claims description 391
- 238000010438 heat treatment Methods 0.000 claims description 105
- 238000010257 thawing Methods 0.000 claims description 24
- 239000007788 liquid Substances 0.000 description 41
- 239000007789 gas Substances 0.000 description 31
- 238000001816 cooling Methods 0.000 description 23
- 238000010586 diagram Methods 0.000 description 16
- 230000015572 biosynthetic process Effects 0.000 description 11
- 239000012071 phase Substances 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 9
- 230000006870 function Effects 0.000 description 8
- 238000000926 separation method Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- 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
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
-
- 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
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25B2313/003—Indoor unit with water as a heat sink or heat source
-
- 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
-
- 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
- F25B2313/021—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit
- F25B2313/0213—Indoor unit or outdoor unit with auxiliary heat exchanger not forming part of the indoor or outdoor unit the auxiliary heat exchanger being only used during heating
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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
-
- 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
-
- 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
-
- 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
- F25B2600/25—Control of valves
- F25B2600/2519—On-off valves
Definitions
- the present disclosure relates to air conditioners and air conditioning systems that include repeaters.
- an air conditioner in which multiple indoor units are connected to an outdoor unit.
- frost adheres to the surface of the fins of the outdoor heat exchanger that functions as an evaporator. Due to the adhesion of this frost, the pressure loss in the air passage of the outdoor heat exchanger increases and the heat transfer performance decreases, so it is necessary to defrost regularly.
- a defrosting operation is known in which the flow of refrigerant during heating operation is temporarily switched to the flow of refrigerant during cooling operation.
- Patent Document 1 discloses a method of continuing heating operation even during defrosting operation.
- the outdoor heat exchange unit is divided into a plurality of heat exchangers, and while one heat exchanger of the outdoor heat exchange unit is being defrosted, the other heat exchanger is an evaporator. is operating as One of the defrosted heat exchangers operates as an evaporator, and the other heat exchanger is defrosted.
- the air conditioner of Patent Document 1 continues the heating operation.
- the present disclosure has been made to solve the above problems, and an object thereof is to provide an air conditioner and an air conditioning system that can suppress frost formation on an outdoor heat exchanger during heating operation.
- An air conditioner includes an outdoor unit having a compressor that compresses a refrigerant, a repeater connected to the outdoor unit, and an indoor unit connected to the repeater.
- the auxiliary heat source equipment has an outdoor heat exchanger that exchanges heat between the water and the fluid, and the auxiliary heat source equipment has an auxiliary heat exchanger that exchanges heat between the refrigerant and hot water flowing inside.
- the refrigerant heated to a high temperature by the auxiliary heat exchanger is supplied to the outdoor heat exchanger of the outdoor unit during heating operation. Therefore, the air conditioner and the air conditioning system can suppress frost formation on the outdoor heat exchanger during heating operation.
- FIG. 1 is a circuit diagram showing the air conditioner 100 according to Embodiment 1.
- FIG. 4 is a diagram showing the flow of refrigerant in cooling operation according to Embodiment 1.
- FIG. 4 is a circuit diagram showing the flow of refrigerant in heating operation according to Embodiment 1.
- FIG. 4 is a circuit diagram showing the flow of refrigerant in defrosting operation according to Embodiment 1.
- FIG. 10 is a circuit diagram showing an air conditioner 100A according to Embodiment 2;
- FIG. 10 is a diagram showing the flow of refrigerant in the pump heating operation according to Embodiment 2;
- FIG. 10 is a circuit diagram showing an air conditioner 100B according to Embodiment 3;
- FIG. 10 is a diagram showing the flow of refrigerant in auxiliary heating operation according to Embodiment 3;
- FIG. 1 is a circuit diagram showing an air conditioner 100 according to Embodiment 1.
- the air conditioner 100 has one outdoor unit A, a repeater B, indoor units C and D, and an auxiliary heat source E.
- the repeater B is interposed between the outdoor unit A, the indoor units C and D, and the auxiliary heat source unit E. Also, the indoor units C and D and the auxiliary heat source unit E are connected to the relay unit B in parallel.
- one repeater B, two indoor units C and D, and one auxiliary heat source unit E are provided for one outdoor unit A.
- the air conditioner 100 may include, for example, two or more outdoor units, two or more repeaters, one or three or more indoor units, or two It may be provided with more than one auxiliary heat source machine.
- the levels of temperature, pressure, etc. shown in the entire specification are not defined in relation to absolute values, but are relatively determined by the state or operation of the apparatus.
- the outdoor unit A and the repeater B are connected by the first refrigerant pipe 1 and the second refrigerant pipe 2.
- the first refrigerant pipe 1 is a large-diameter pipe through which a low-pressure refrigerant flows.
- the second refrigerant pipe 2 is a pipe having a smaller diameter than the first refrigerant pipe 1 through which a high-pressure refrigerant flows.
- the third refrigerant pipes 3c to 3e are pipes branched from the first refrigerant pipe 1.
- the fourth refrigerant pipes 4c to 4e are pipes branched from the second refrigerant pipe 2. As shown in FIG.
- the repeater B and the indoor unit C are connected by a third refrigerant pipe 3c and a fourth refrigerant pipe 4c.
- the repeater B and the indoor unit D are connected by a third refrigerant pipe 3d and a fourth refrigerant pipe 4d.
- the repeater B and the auxiliary heat source E are connected by a third refrigerant pipe 3e and a fourth refrigerant pipe 4e.
- the outdoor unit A is normally arranged in a space such as a roof outside a building such as a building, and supplies cold or hot heat to the indoor units C and D and the auxiliary heat source unit E via the repeater B.
- the outdoor unit A is not limited to being installed outdoors, and may be installed in an enclosed space such as a machine room with a ventilation opening. Further, the outdoor unit A may be installed inside the building if the exhaust duct can exhaust the waste heat to the outside of the building. Also, the outdoor unit A may be installed inside a building as a water-cooled outdoor unit. As described above, the outdoor unit A may be installed in any place as long as a waste heat treatment method can be secured. Further, the outdoor unit A is provided with a sensor (not shown) for measuring the outdoor temperature.
- the outdoor unit A includes a fifth refrigerant pipe 5, a sixth refrigerant pipe 6, a compressor 10, a suction pipe 10a, a discharge pipe 10b, a flow path switching device 11, an outdoor heat exchanger 12, an outdoor fan 13, and a first flow control device. 14 and an accumulator 15 . Further, inside the outdoor unit A, a first refrigerant pipe 1 and a second refrigerant pipe 2 are drawn.
- the first refrigerant pipe 1 connects the channel switching device 11 and the repeater B.
- the second refrigerant pipe 2 connects the outdoor heat exchanger 12 of the outdoor unit A and the repeater B.
- the fifth refrigerant pipe 5 connects the channel switching device 11 and the accumulator 15 .
- the sixth refrigerant pipe 6 connects the flow switching device 11 and the outdoor heat exchanger 12 .
- the compressor 10 sucks and compresses the refrigerant to bring it into a high-temperature and high-pressure state, and is composed of, for example, an inverter compressor whose capacity is controllable.
- the suction pipe 10 a connects the suction port of the compressor 10 and the channel switching device 11 .
- the discharge pipe 10 b is connected to the discharge port of the compressor 10 and the channel switching device 11 .
- the channel switching device 11 is, for example, a four-way switching valve that switches between the flow of refrigerant during heating operation and the flow of refrigerant during cooling operation.
- the channel switching device 11 switches between two connection states.
- One connection state is a connection state in which the sixth refrigerant pipe 6 and the discharge pipe 10b are connected, and the first refrigerant pipe 1 and the fifth refrigerant pipe 5 are connected.
- the other connection state is a connection state in which the first refrigerant pipe 1 and the discharge pipe 10b are connected, and the fifth refrigerant pipe 5 and the sixth refrigerant pipe 6 are connected.
- the outdoor heat exchanger 12 exchanges heat between the heat source side refrigerant flowing through the outdoor unit A and the air supplied from the outdoor fan 13 .
- the outdoor heat exchanger 12 functions as an evaporator during heating operation, and evaporates the refrigerant into gas.
- the outdoor heat exchanger 12 functions as a condenser or a radiator during cooling operation, and condenses and liquefies the refrigerant.
- the outdoor heat exchanger 12 is, for example, an air-cooled outdoor heat exchanger.
- the outdoor heat exchanger 12 may be of another type such as a water-cooled type instead of an air-cooled type, as long as heat is exchanged between a refrigerant and a fluid other than the refrigerant.
- the outdoor fan 13 is installed near the outdoor heat exchanger 12 and controls the flow rate of air that exchanges heat with the refrigerant.
- the outdoor fan 13 is an example of a flow rate control device that controls the flow rate of fluid that exchanges heat with the refrigerant. If the outdoor heat exchanger 12 is of a water-cooled type, instead of the outdoor fan 13, a pump for supplying water to the outdoor heat exchanger 12 may be provided.
- the first flow control device 14 is provided between the check valves 16 and 19 and the outdoor heat exchanger 12 .
- the first flow control device 14 is, for example, an electronic expansion valve whose opening is variably controlled.
- the first flow control device 14 adjusts the flow rate of refrigerant flowing from the outdoor heat exchanger 12 to the check valve 16 during cooling operation.
- the first flow control device 14 adjusts the flow rate of refrigerant flowing into the heat exchanger 3 from the check valve 19 during heating operation.
- the accumulator 15 is provided on the suction side of the compressor 10, and stores surplus refrigerant caused by a difference in the amount of circulation during heating operation and cooling operation, or surplus refrigerant due to transient changes in operation.
- the outdoor unit A also has a seventh refrigerant pipe 7 , an eighth refrigerant pipe 8 , a check valve 16 , a check valve 17 , a check valve 18 , and a check valve 19 .
- a high-pressure refrigerant is supplied by the seventh refrigerant pipe 7, the eighth refrigerant pipe 8, the check valve 16, the check valve 17, the check valve 18, and the check valve 19 regardless of the connection state of the flow path switching device 11. It flows out from the outdoor unit A through the second refrigerant pipe 2 .
- the low-pressure refrigerant is supplied to the outdoor unit through the first refrigerant pipe 1 by the seventh refrigerant pipe 7, the eighth refrigerant pipe 8, the check valve 16, the check valve 17, the check valve 18, and the check valve 19. Flow into A.
- the seventh refrigerant pipe 7 connects between the flow switching device 11 and the check valve 16 in the first refrigerant pipe 1 and between the check valve 16 and the repeater B in the second refrigerant pipe 2.
- the eighth refrigerant pipe 8 connects between the check valve 17 and the repeater B in the first refrigerant pipe 1 and between the outdoor heat exchanger 12 and the check valve 16 in the second refrigerant pipe 2. is.
- the check valve 16 is provided between the outdoor heat exchanger 12 and the repeater B in the second refrigerant pipe 2 and allows the refrigerant to flow only in the direction from the outdoor unit A to the repeater B.
- the check valve 17 is provided between the repeater B and the flow path switching device 11 in the first refrigerant pipe 1 and allows the refrigerant to flow only in the direction from the repeater B to the outdoor unit A.
- the check valve 18 is provided in the seventh refrigerant pipe 7 and allows the refrigerant discharged from the compressor 10 to flow through the relay B during the heating operation.
- the check valve 19 is provided in the eighth refrigerant pipe 8 and circulates the refrigerant returned from the repeater B to the suction side of the compressor 10 during the heating operation.
- the outdoor unit A has a first bypass pipe 21 and a second flow control device 22 .
- the first bypass pipe 21 connects between the first flow control device 14 and the check valve 16 in the discharge pipe 10b and the second pipe.
- the second flow control device 22 is provided on the bypass pipe 23 .
- the second flow control device 22 is, for example, an electronic expansion valve whose opening is variably controlled.
- the second flow control device 22 adjusts the flow rate of refrigerant flowing from the compressor 10 to the check valve 16 during cooling operation.
- the second flow control device 22 adjusts the flow rate of refrigerant flowing from the check valve 19 into the discharge pipe 10b during heating operation.
- the outdoor unit A is provided with a discharge pressure gauge 25, a suction pressure gauge 26, an intermediate pressure gauge 27, and a temperature gauge 28.
- a discharge pressure gauge 25 is provided on the discharge pipe 10 b and measures the pressure of the refrigerant discharged from the compressor 10 .
- a suction pressure gauge 26 is provided in the suction pipe 10 a and measures the pressure of the refrigerant sucked into the compressor 10 .
- the medium-pressure pressure gauge 29 is provided between the first flow control device 14 and the second flow control device 22 and the check valves 19 and 19 in the second refrigerant pipe 2 .
- the intermediate pressure gauge 29 measures the intermediate pressure, which is the pressure of the refrigerant flowing between the first flow control device 14 and the second flow control device 22 in the second refrigerant pipe 2 and the check valves 19 and 19. Measure.
- a thermometer 28 is provided on the discharge pipe 10 b and measures the temperature of the refrigerant discharged from the compressor 10 . Pressure information and temperature information detected by the discharge pressure gauge 25, the suction pressure gauge 26, the intermediate pressure pressure gauge 27, and the temperature gauge 28 are sent to the control device 9 that controls the operation of the air conditioner 100, and controls each actuator. used for
- the repeater B includes a first branch portion 31, a second branch portion 32, a third branch portion 33, solenoid valves 41c to 41e and 42c to 42e, a gas-liquid separator 51, a second bypass pipe 52, and a third bypass pipe 53. , a third flow controller 54 , a fourth flow controller 55 , a first heat exchanger 56 and a second heat exchanger 57 . Further, inside the repeater B, third refrigerant pipes 3c to 3e and fourth refrigerant pipes 4c to 4e are drawn.
- the third refrigerant pipe 3c connects the repeater B and the indoor unit C.
- the third refrigerant pipe 3 c is branched inside the repeater B, one branch is connected to the third branch portion 33 , and the other branch is connected to the first branch portion 31 .
- the third refrigerant pipe 3d connects the repeater B and the indoor unit D. As shown in FIG.
- the third refrigerant pipe 3 d is branched inside the repeater B, one branch is connected to the third branch portion 33 , and the other branch is connected to the first branch portion 31 .
- the third refrigerant pipe 3e connects the repeater B and the auxiliary heat source E. As shown in FIG.
- the third refrigerant pipe 3 e is branched inside the repeater B, one branch is connected to the third branch portion 33 , and the other branch is connected to the first branch portion 31 .
- the fourth refrigerant pipe 4c connects the second branch portion 32 of the repeater B and the indoor unit C.
- the fourth refrigerant pipe 4d connects the second branch portion 32 of the repeater B and the indoor unit D.
- the fourth refrigerant pipe 4e connects the second branch portion 32 of the repeater B and the auxiliary heat source E. As shown in FIG.
- the first branch portion 31 is a portion where the second refrigerant pipe 2 and the other branch of the third refrigerant pipes 3c to 3e are connected.
- the second branch portion 32 is a portion where the second bypass pipe 52, the third bypass pipe 53, and the fourth refrigerant pipes 4c to 4e are connected.
- the third branch portion 33 is a portion where the first refrigerant pipe 1, the second bypass pipe 52, and one branch of the third refrigerant pipes 3c to 3e are connected.
- the solenoid valves 41c to 41e and 42c to 42e switch the circulation state of the refrigerant between the repeater B, the indoor units C and D, and the auxiliary heat source unit E.
- the solenoid valve 41c is provided at one branch of the third refrigerant pipe 3c. By controlling the opening/closing state of the electromagnetic valve 41c, the presence or absence of circulation of the refrigerant in the third refrigerant pipe 3c, the third branch portion 33, and the first refrigerant pipe 1 is switched.
- 41 d of solenoid valves are provided in one branch of 3 d of 3rd refrigerant
- the solenoid valve 41e is provided at one branch of the third refrigerant pipe 3e.
- the solenoid valve 41e By controlling the opening/closing state of the electromagnetic valve 41e, the presence or absence of circulation of the refrigerant in the third refrigerant pipe 3e, the third branch portion 33, and the first refrigerant pipe 1 is switched.
- the solenoid valve 42c is provided on the other branch of the third refrigerant pipe 3c. By controlling the opening/closing state of the solenoid valve 42c, the presence or absence of circulation of the refrigerant in the third refrigerant pipe 3c, the first branch portion 31, and the second refrigerant pipe 2 is switched.
- the solenoid valve 42d is provided on the other branch of the third refrigerant pipe 3d. By controlling the opening/closing state of the solenoid valve 42d, the presence or absence of circulation of the refrigerant in the third refrigerant pipe 3d, the first branch portion 31, and the second refrigerant pipe 2 is switched.
- the solenoid valve 42e is provided on the other branch of the third refrigerant pipe 3e. By controlling the opening/closing state of the solenoid valve 42e, the presence or absence of circulation of the refrigerant in the third refrigerant pipe 3e, the first branch portion 31, and the second refrigerant pipe 2 is switched.
- the gas-liquid separation device 51 is provided in the middle of the second refrigerant pipe 2 and separates the refrigerant flowing through the second refrigerant pipe 2 into a gas phase portion and a liquid phase portion.
- the gas-phase portion separated by the gas-liquid separation device 51 flows into the first branch portion 31
- the liquid-phase portion separated by the gas-liquid separation device 51 flows into the second branch portion 32 .
- the second bypass pipe 52 is a pipe that connects the gas-liquid separation device 51 and the second branch portion 32 .
- the third bypass pipe 53 is a pipe that connects the second branch portion 32 and the third branch portion 33 .
- the third flow control device 54 is provided in the middle of the second bypass pipe 52 and is, for example, an electronic expansion valve whose opening is variably controlled.
- the fourth flow control device 55 is provided in the middle of the third bypass pipe 53, and is, for example, an electronic expansion valve whose opening is variably controlled.
- the first heat exchanger 56 includes the refrigerant between the gas-liquid separation device 51 and the fourth flow control device 55 in the second bypass pipe 52, and the second heat exchanger 57 and the third branch part in the third bypass pipe 53. heat exchange with the refrigerant between 33.
- the second heat exchanger 57 exchanges the refrigerant between the third flow control device 54 and the second branch portion 32 in the second bypass pipe 52 and the first heat exchange with the fourth flow control device 55 in the third bypass pipe 53. It exchanges heat with the refrigerant between it and the vessel 56 .
- a flow path switching valve such as a check valve is provided in the second branch portion 32 so that the refrigerant flowing into the second branch portion 32 from the indoor units C and D for heating flows into the second heat exchanger 57.
- a flow path switching valve such as a check valve is provided in the second branch portion 32 so that the refrigerant flowing into the second branch portion 32 from the indoor units C and D for heating flows into the second heat exchanger 57.
- the indoor units C and D are installed in a position where conditioned air can be supplied to the air-conditioned space such as the room, and the cold or hot heat from the outdoor unit A supplied via the repeater B supplies the air-conditioned space to the air-conditioned space. It supplies heating air.
- the indoor unit C has a fifth flow control device 61c, an indoor heat exchanger 62c, and an indoor fan 63c.
- the indoor unit D also has a fifth flow control device 61d, an indoor heat exchanger 62d, and an indoor fan 63d, similarly to the indoor unit C, and each device is the same as each device of the indoor unit C.
- the indoor units C and D are provided with sensors (not shown) for measuring the room temperature.
- the fifth flow control device 61c is, for example, an electronic expansion valve whose opening is variably controlled.
- the fifth flow control device 61c is provided between the second branch portion 32 of the repeater B in the third refrigerant pipe 3c and the indoor heat exchanger 62c.
- the flow rate of the refrigerant flowing into the indoor heat exchanger 62c is adjusted by the fifth flow control device 61c.
- the indoor heat exchanger 62c exchanges heat between the load-side refrigerant flowing through the indoor unit C and the air supplied from the indoor fan 63c. Thereby, heated air or cooled air is generated to be supplied to the space to be air-conditioned.
- the indoor heat exchanger 62c is, for example, an air-cooled indoor heat exchanger.
- the indoor heat exchanger 62c may be of another system such as a water-cooled system instead of an air-cooled system, as long as heat is exchanged between the refrigerant and a fluid other than the refrigerant.
- the indoor fan 63c is installed near the indoor heat exchanger 62c and controls the flow rate of air that exchanges heat with the refrigerant.
- the indoor fan 63c is an example of a flow rate control device that controls the flow rate of fluid that exchanges heat with the refrigerant. If the indoor heat exchanger 62c is of a water-cooled type, instead of the indoor fan 63c, a pump for supplying water to the indoor heat exchanger 62c may be provided.
- the auxiliary heat source equipment E takes heat from a heat medium such as a hot water tank F connected to a boiler or the like, and supplies heat to the outdoor heat exchanger 12 of the outdoor unit A. As a result, it is possible to suppress frost formation in the heating operation and shorten the time required for the defrosting operation.
- the auxiliary heat source equipment E has a fifth flow control device 61 e , a water pipe 71 , a water pump 72 and an auxiliary heat exchanger 73 .
- An air conditioning system is configured by adding a hot water tank F to the air conditioning apparatus 100 including the outdoor unit A, the relay unit B, the indoor units C and D, and the auxiliary heat source unit E.
- the fifth flow control device 61e is, for example, an electronic expansion valve whose opening is variably controlled.
- the fifth flow control device 61e is provided between the second branch portion 32 of the repeater B and the auxiliary heat exchanger 73 in the third refrigerant pipe 3e.
- the flow rate of the refrigerant flowing into the auxiliary heat exchanger 73 is adjusted by the fifth flow control device 61e.
- the water pipe 71 is connected to an external pipe 99 connected to a hot water tank F provided outside the air conditioner 100 and supplies hot water to the auxiliary heat exchanger 73 .
- the hot water tank F is connected to a boiler (not shown) or the like provided outside the air conditioner 100, and stores hot water heated by the boiler.
- the water pump 72 is provided in the water pipe 71 and sends hot water to the auxiliary heat exchanger 73 .
- the auxiliary heat exchanger 73 is, for example, a plate heat exchanger.
- the auxiliary heat exchanger 73 exchanges heat between cold refrigerant from the outdoor unit A flowing through the repeater B and hot water supplied from a heat medium connected to a boiler or the like. This heat exchange warms the cold refrigerant that has flowed into the auxiliary heat exchanger 73 and flows out of the auxiliary heat exchanger 73 as hot refrigerant.
- control device 9 A control device 9 is provided in the air conditioner 100 .
- the control device 9 is, for example, a microcomputer having a CPU (Central Processing Unit) and a memory 9a.
- the control device 9 executes a program stored in the memory 9 a by the CPU and controls each device of the air conditioner 100 .
- the control device 9 controls actuators and the like based on refrigerant pressure information, refrigerant temperature information, outdoor temperature information, indoor temperature information, and the like detected by sensors provided in the air conditioner 100 .
- the control device 9 drives the compressor 10, switches the flow path switching device 11, drives the fan motor of the outdoor fan 13, drives the fan motors of the indoor fans 63c to 63e, and controls the electromagnetic valves 41c to 41e and 42c to 42e. , and the opening of each flow control device.
- the memory 9a stores functions and the like for determining each control value.
- a control device 9 having the same configuration and functions is provided for each of the outdoor unit A and the repeater B, and each actuator is controlled by communicating with each other.
- the number of the control devices 9 may be one or three or more.
- the control device 9 may be installed in the indoor unit C or D, or the auxiliary heat source unit E, or may be installed in a place other than the outdoor unit A, the relay unit B, the indoor unit C or D, or the auxiliary heat source unit E. May be installed as a unit.
- Each function of the control device 9 may be realized by a dedicated processing circuit such as an analog circuit or a digital circuit.
- the air conditioner 100 has three operation modes: cooling operation, heating operation, and defrosting operation.
- Cooling operation is an operation mode in which all the indoor units C and D perform cooling operation.
- the heating operation is an operation mode in which all the indoor units C and D perform the heating operation.
- Defrosting operation is an operation mode that is performed when the outdoor heat exchanger 12 is frosted. Although the details will be described below, frost formation on the outdoor heat exchanger 12 is suppressed by performing the heating operation of the first embodiment even when the outside air temperature is low.
- the defrosting operation of Embodiment 1 can defrost the outdoor heat exchanger 12 in a short period of time when the outdoor temperature is extremely low and the outdoor heat exchanger 12 is frosted.
- FIG. 2 is a diagram showing the flow of refrigerant in the cooling operation according to Embodiment 1.
- FIG. In the figures showing the flow of the refrigerant, including FIG. 2, the solenoid valves that are closed are hatched.
- the control device 9 changes the connection state of the flow path switching device 11, as shown in FIG. 5 A connection state is established in which the refrigerant pipe 5 is connected.
- the refrigerant discharged from the compressor 10 flows to the outdoor heat exchanger 12 .
- the solenoid valves 41c and 41d are opened, and the solenoid valves 42c, 42d, 41e and 42e are closed.
- a low-temperature, low-pressure gas refrigerant is compressed by the compressor 10 and discharged as a high-temperature, high-pressure gas refrigerant.
- the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the outdoor heat exchanger 12 via the flow switching device 11 .
- the refrigerant is cooled while heating the outdoor air, and becomes medium-temperature and high-pressure liquid refrigerant.
- the medium-temperature and high-pressure liquid refrigerant that has flowed out of the outdoor heat exchanger 12 passes through the second refrigerant pipe 2 and is separated by the gas-liquid separator 51 .
- the separated refrigerant exchanges heat with the refrigerant flowing through the second bypass pipe 52 in the first heat exchanger 56, passes through the third flow control device 54, and flows through the second bypass pipe 52 in the second heat exchanger 57. It exchanges heat with the refrigerant flowing through it and is cooled.
- the liquid refrigerant cooled by the first heat exchanger 56 and the second heat exchanger 57 flows into the second branch portion 32, part of which is bypassed by the third bypass pipe 53, and the rest is the fourth refrigerant pipe 4c and Flow into 4d.
- the high-pressure liquid refrigerant flowing through the fourth refrigerant pipes 4c and 4d flows into the fifth flow control devices 61c and 61d of the indoor units C and D, respectively. Then, the high-pressure liquid refrigerant is throttled by the fifth flow rate control devices 61c and 61d, expands and decompresses, and becomes a low-temperature, low-pressure gas-liquid two-phase state.
- the change of the refrigerant in the fifth flow control devices 61c and 61d is performed under a constant enthalpy.
- the low-temperature, low-pressure gas-liquid two-phase refrigerant flowing out of the fifth flow control devices 61c and 61d flows into the indoor heat exchangers 62c and 62d. Then, the refrigerant is heated while cooling the indoor air, and becomes a low-temperature, low-pressure gas refrigerant.
- the low-temperature, low-pressure gas refrigerant flowing out of the indoor heat exchangers 62c and 62d flows into the third branch portion 33 through the solenoid valves 41c and 41d, respectively.
- the low-temperature, low-pressure gas refrigerant that joins at the first branch portion 31 joins the low-temperature, low-pressure gas refrigerant heated by the first heat exchanger 56 and the second heat exchanger 57 of the third bypass pipe 53, 1 flows into the compressor 10 through the refrigerant pipe 1 and the flow switching device 11 and is compressed.
- FIG. 3 is a circuit diagram showing the flow of refrigerant in heating operation according to the first embodiment.
- the refrigerant sent from the compressor 10 of the outdoor unit A flows through the indoor heat exchanger 62c of the indoor unit C and the indoor heat exchanger 62d of the indoor unit D, and flows through the auxiliary heat exchanger 73 of the auxiliary heat source unit E. It is supplied to the outdoor heat exchanger 12 via the outdoor unit A and returns to the compressor 10 of the outdoor unit A again.
- the heating operation is performed, as shown in FIG. 6 to establish a connection state in which the refrigerant pipe 6 is connected.
- the solenoid valves 42c, 42d and 41e are opened, and the solenoid valves 41c, 41d and 42e are closed.
- a low-temperature, low-pressure gas refrigerant is compressed by the compressor 10 and discharged as a high-temperature, high-pressure gas refrigerant.
- the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the first branch portion 31 via the flow path switching device 11 and the second refrigerant pipe 2 .
- the high-temperature and high-pressure gas refrigerant that has flowed into the first branch portion 31 is branched at the first branch portion 31, passes through the solenoid valves 42c and 42d, and flows into the indoor heat exchangers 62c and 62d. Then, the refrigerant is heated while cooling the indoor air, and becomes medium-temperature and high-pressure liquid refrigerant.
- the low-temperature, low-pressure, gas-liquid two-phase refrigerant that exits the fifth flow control device 61e flows into the auxiliary heat exchanger 73 that exchanges heat with hot water. Then, the refrigerant is heated by heat exchange with hot water, and becomes a high-temperature, low-pressure gas refrigerant.
- the high-temperature, low-pressure gas refrigerant coming out of the auxiliary heat exchanger 73 flows into the first refrigerant pipe 1 through the solenoid valve 41e.
- the high-temperature, low-pressure, single-phase gas refrigerant that passes through the first refrigerant pipe 1 flows into the outdoor heat exchanger 12 . Then, the refrigerant absorbs heat from the outdoor air and becomes a low-temperature, low-pressure gas refrigerant.
- the low-temperature and low-pressure gas refrigerant that has left the outdoor heat exchanger 12 flows through the flow switching device 11 into the compressor 10 and is compressed.
- the outdoor heat exchanger 12 of the outdoor unit A functions as an evaporator, and when the heat transfer surface becomes 0°C or below, the moisture in the air condenses and freezes. Frost forms.
- the outdoor fan 13 was used to suppress the decrease in the evaporation temperature.
- the refrigerant flowing into the outdoor heat exchanger 12 is in a state of low temperature and low pressure, and the outdoor heat exchanger 12 is easily frosted.
- the outdoor heat exchanger 12 is frosted, the flow path of the air is narrowed and the air volume is reduced, which causes the frost to grow further and the heat exchange amount to decrease, which causes a decrease in the heating capacity.
- Embodiment 1 the refrigerant flowing out from the indoor heat exchangers 62c and 62d passes through the auxiliary heat exchanger 73 and becomes high temperature and low pressure and flows through the outdoor heat exchanger 12. As a result, the temperature of the heat transfer surface of the outdoor heat exchanger 12 is maintained at 0 degrees or higher, and frost formation is suppressed.
- FIG. 4 is a circuit diagram showing refrigerant flow in the defrosting operation according to the first embodiment.
- the refrigerant sent from the compressor 10 of the outdoor unit A flows through the outdoor heat exchanger 12, the indoor heat exchanger 62c of the indoor unit C, the indoor heat exchanger 62d of the indoor unit D, and the auxiliary heat source device E and the auxiliary heat exchanger 73 of the outdoor unit A in parallel, and return to the compressor 10 of the outdoor unit A again.
- FIG. A connection state is established in which the fifth refrigerant pipe 5 is connected.
- the refrigerant discharged from the compressor 10 flows to the outdoor heat exchanger 12 .
- the solenoid valves 41c, 41d and 41e are opened, and the solenoid valves 42c, 42d and 42e are closed.
- a low-temperature, low-pressure gas refrigerant is compressed by the compressor 10 and discharged as a high-temperature, high-pressure gas refrigerant.
- the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the outdoor heat exchanger 12 via the flow switching device 11 .
- the refrigerant is cooled while heating the outdoor air, and becomes medium-temperature and high-pressure liquid refrigerant.
- the medium-temperature and high-pressure liquid refrigerant that has flowed out of the outdoor heat exchanger 12 passes through the second refrigerant pipe 2 and is separated by the gas-liquid separator 51 .
- the separated refrigerant exchanges heat with the refrigerant flowing through the third bypass pipe 53 in the first heat exchanger 56, passes through the third flow control device 54, and flows through the third bypass pipe 53 in the second heat exchanger 57. It exchanges heat with the refrigerant flowing through it and is cooled.
- the liquid refrigerant cooled by the first heat exchanger 56 and the second heat exchanger 57 flows into the second branch portion 32, part of which is bypassed by the second bypass pipe 52, and the rest is the fourth refrigerant pipe 4c to 4e.
- the high-pressure liquid refrigerant flowing through the fourth refrigerant pipes 4c-4e flows into the fifth flow control devices 61c-61e. Then, the high-pressure liquid refrigerant is throttled by the fifth flow control devices 61c to 61e, expands and decompresses, and becomes a low-temperature, low-pressure gas-liquid two-phase state. It should be noted that the change of refrigerant in the fifth flow control devices 61c to 61e is performed under a constant enthalpy.
- the low-temperature, low-pressure gas-liquid two-phase refrigerant that has flowed through the fifth flow control devices 61c and 61d flows into the indoor heat exchangers 62c and 62d. Then, the refrigerant is heated to become a low-temperature, low-pressure gas refrigerant.
- the auxiliary heat source E the low-temperature, low-pressure gas-liquid two-phase refrigerant that has flowed through the fifth flow control device 61 e flows into the auxiliary heat exchanger 73 . Then, the refrigerant is heated while exchanging heat with hot water through the auxiliary heat exchanger 73, and becomes a high-temperature, low-pressure gas refrigerant.
- the refrigerant that has flowed through the indoor heat exchangers 62c and 62d and the auxiliary heat exchanger 73 passes through the electromagnetic valves 41c, 41d and 41e, respectively, and flows into the third branch portion 33.
- the refrigerant flowing into the third branch portion 33 flows to the indoor heat exchangers 62c and 62d and the auxiliary heat exchanger 73 so that it becomes a high-temperature, low-pressure gas refrigerant.
- Refrigerant flow is regulated.
- the high-temperature, low-pressure gas refrigerant joined at the third branch 33 joins the low-temperature, low-pressure gas refrigerant heated by the first heat exchanger 56 and the second heat exchanger 57 of the third bypass pipe 53, 1 flows into the compressor 10 through the refrigerant pipe 1 and the flow switching device 11 and is compressed.
- the state of the refrigerant returning to the outdoor unit A was a low-temperature, low-pressure gas-liquid two-layer state.
- Embodiment 1 in the auxiliary heat exchanger 73, heat is exchanged between the refrigerant returning to the outdoor unit A and the hot water heated by the boiler or the like. Therefore, the refrigerant returning to the outdoor unit A becomes a high-temperature, low-pressure gas refrigerant obtained by extracting heat from hot water.
- the refrigerant heated to a high temperature by the auxiliary heat exchanger 73 is supplied to the outdoor heat exchanger 12 of the outdoor unit A of Embodiment 1 during heating operation. Therefore, the air conditioner 100 can suppress frost formation on the outdoor heat exchanger during heating operation.
- the refrigerant brought to a high temperature and low pressure state by the auxiliary heat source E flows through the outdoor heat exchanger 12 of the outdoor unit A.
- the temperature of the heat transfer surface of the outdoor heat exchanger 12 is maintained at 0 degrees or higher, and frost formation is suppressed. Therefore, the air conditioner 100 can continue the heating operation even when the outside air temperature is low.
- the refrigerant discharged from the compressor 10 can be supplied to the indoor heat exchangers 62c and 62d without being used for defrosting, a decrease in heating capacity is suppressed.
- the refrigerant returning to the outdoor unit A is in a high-temperature, low-pressure gas refrigerant state.
- the refrigerant discharged from the compressor 10 is discharged in a higher-temperature, higher-pressure state than before, and supplied to the outdoor heat exchanger 12 . Therefore, the air conditioner 100 can improve the defrosting ability and shorten the defrosting operation time.
- FIG. 5 is a circuit diagram showing an air conditioner 100A according to Embodiment 2. As shown in FIG. An air conditioner 100A of the present embodiment differs from that of the first embodiment in the configuration of the auxiliary heat source machine E. The configurations of the outdoor unit A, the repeater B, and the indoor units C and D of the air conditioner 100A are the same as in the first embodiment.
- the auxiliary heat source machine E has a pump pipe 81, a solenoid valve 82, a refrigerant pump 83, and a check valve 84 in addition to the configuration described in the first embodiment.
- the pump pipe 81 is connected between the second branch portion 32 of the repeater B in the fourth refrigerant pipe 4e and the fifth flow control device 61e.
- An inflow port 81 a of the pump pipe 81 is provided closer to the repeater B than an outflow port 81 b of the pump pipe 81 .
- the solenoid valve 82 is provided between the inlet 81 a of the pump pipe 81 and the refrigerant pump 83 .
- the refrigerant pump 83 is provided between the solenoid valve 82 and the check valve 84 in the pump pipe 81 .
- the refrigerant pump 83 sends out the refrigerant flowing through the pump pipe 81 to the check valve 84 side. Note that the refrigerant pump 83 does not compress the refrigerant.
- the check valve 84 is provided in the pump pipe 81 between the refrigerant pump 83 and the outflow port 81b.
- the check valve 84 allows the refrigerant to flow only in the direction from the refrigerant pump 83 to the outflow port 81 b in the pump pipe 81 .
- the air conditioner 100A of Embodiment 2 executes the operation modes of cooling operation, heating operation, and defrosting operation.
- the air conditioner 100A of Embodiment 2 can stop the compressor 10 of the outdoor unit A and perform heating operation.
- the heating operation in which the refrigerant pump 83 is driven in this manner is referred to as pump heating operation.
- the heating operation other than the pump heating operation will be referred to as normal heating operation.
- the control device 9 performs normal heating operation when the heating load is equal to or greater than a predetermined threshold, and performs pump heating operation when the heating load is less than the threshold.
- the heating load is estimated based on refrigerant pressure information, refrigerant temperature information, outdoor temperature information, indoor temperature information, and the like detected by sensors provided in the air conditioner 100, for example.
- the solenoid valves 42c, 42d and 42e of the repeater B and the solenoid valve 82 of the auxiliary heat source machine E are opened, and the solenoid valves 41c, 41d and 41e of the repeater B are closed.
- part of the refrigerant flowing through the fourth refrigerant pipe 4 is drawn into the pump pipe 81 and sent out by the refrigerant pump 83 .
- the solenoid valves 42c, 42d and 41e of the repeater B are opened, and the solenoid valves 41c, 41d and 42e of the repeater B and the solenoid valve 82 of the auxiliary heat source machine E are closed. .
- FIG. 6 is a diagram showing the flow of refrigerant in the pump heating operation according to the second embodiment.
- the refrigerant that has flowed through the indoor heat exchanger 62c of the indoor unit C and the indoor heat exchanger 62d of the indoor unit D passes through the auxiliary heat exchanger 73 of the auxiliary heat source unit E and the refrigerant pump 83, and then flows into the room again. It becomes a flow that flows through the indoor heat exchanger 62c of the unit C and the indoor heat exchanger 62d of the indoor unit D.
- the control device 9 stops the operation of the compressor 10 . 6
- the control device 9 opens the electromagnetic valves 42c, 42d and 42e of the repeater B and the electromagnetic valve 82 of the auxiliary heat source machine E, and opens the electromagnetic valves 41c, 41d and 41e of the repeater B. is closed.
- the operation of the refrigerant pump 83 is started.
- a part of the liquid refrigerant flowing through the fourth refrigerant pipe 4 e is drawn into the pump pipe 81 and sent out by the refrigerant pump 83 .
- the liquid refrigerant sent from the refrigerant pump 83 passes through the check valve 96 , joins the liquid refrigerant flowing through the fourth refrigerant pipe 4 , and flows into the auxiliary heat exchanger 73 .
- the refrigerant is heated while exchanging heat with hot water through the auxiliary heat exchanger 73, and becomes a high-temperature, medium-pressure refrigerant.
- the refrigerant exiting the auxiliary heat exchanger 73 flows into the first branch portion 31 through the solenoid valve 42e.
- the refrigerant that has flowed into the first branch portion 31 flows into the indoor units C and D through the electromagnetic valves 42c and 42d.
- the high-temperature, medium-pressure refrigerant that has flowed into the indoor units C and D is cooled while heating the indoor air in the indoor heat exchangers 62c and 62d, and becomes medium-temperature, medium-pressure liquid refrigerant.
- the medium-temperature, medium-pressure liquid refrigerant that has flowed out of the indoor heat exchangers 62c and 62d passes through the fifth flow control devices 61c and 61d and flows into the second branch portion 32.
- the refrigerant that has flowed into the second branch portion 32 flows again into the fourth refrigerant pipe 4e of the auxiliary heat source equipment E and circulates.
- the outdoor heat exchanger 12 of the outdoor unit A is supplied with the refrigerant heated to a high temperature by the auxiliary heat exchanger 73 . Therefore, the air conditioner 100A can suppress frost formation on the outdoor heat exchanger during heating operation.
- the auxiliary heat exchanger 73 heat is exchanged between the refrigerant flowing through the auxiliary heat source equipment E and hot water heated by a boiler or the like, so that the temperature of the refrigerant can be increased. Furthermore, by performing a pump heating operation in which the refrigerant is circulated between the indoor units C and D and the auxiliary heat source equipment E using the refrigerant pump 83, the heating operation can be performed without operating the compressor 10 of the outdoor unit A. It becomes possible.
- the air conditioner 100A can suppress frost formation on the outdoor heat exchanger 12 while continuing the heating operation.
- FIG. 7 is a circuit diagram showing an air conditioner 100B according to Embodiment 3.
- An air conditioner 100A of the present embodiment differs from that of the first embodiment in the configuration of the auxiliary heat source equipment E.
- the configurations of the outdoor unit A, the repeater B, and the indoor units C and D of the air conditioner 100B are the same as in the first embodiment.
- the auxiliary heat source machine E has an auxiliary compressor pipe 91, an electromagnetic valve 92, an electromagnetic valve 93, an auxiliary accumulator 94, an auxiliary compressor 95, and a check valve 96 in addition to the configuration described in the first embodiment.
- the auxiliary compressor pipe 91 is connected between the solenoid valves 41e and 42e of the repeater B and the auxiliary heat exchanger 73 in the third refrigerant pipe 3e.
- An inflow port 91 a of the auxiliary compressor pipe 91 is provided closer to the auxiliary heat exchanger 73 than an outflow port 91 b of the auxiliary compressor pipe 91 .
- the solenoid valve 92 is provided between a portion of the third refrigerant pipe 3e to which the inflow port 91a of the auxiliary compressor pipe 91 is connected and a portion to which the outflow port 91b is connected. By controlling the opening/closing state of the electromagnetic valve 92, the flow path of the refrigerant flowing from the auxiliary heat exchanger 73 is adjusted.
- the solenoid valve 93 is provided between the inlet 91 a and the auxiliary accumulator 94 in the auxiliary compressor pipe 91 . By controlling the open/closed state of the electromagnetic valve 93 , whether or not the refrigerant flows from the auxiliary heat exchanger 73 to the auxiliary compressor pipe 91 is switched.
- the auxiliary accumulator 94 is provided between the solenoid valve 93 and the auxiliary compressor 95 in the auxiliary compressor pipe 91 , that is, on the suction side of the auxiliary compressor 95 .
- the auxiliary accumulator 94 stores surplus refrigerant caused by a difference in the amount of circulation between heating operation and cooling operation, or surplus refrigerant for transient changes in operation.
- the auxiliary compressor 95 sucks in the refrigerant flowing through the auxiliary heat source E and compresses it to a high temperature and high pressure state.
- the auxiliary compressor 95 is composed of, for example, an inverter compressor whose capacity is controllable.
- the check valve 96 is provided in the auxiliary compressor pipe 91 between the auxiliary compressor 95 and the outflow port 91b. The check valve 96 allows the flow of refrigerant only from the auxiliary compressor 95 to the outflow port 91b.
- the air conditioner 100B of Embodiment 3 executes the operation modes of cooling operation, heating operation, and defrosting operation.
- the air conditioner 100B of Embodiment 3 can stop the compressor 10 of the outdoor unit A and perform the heating operation.
- Such a heating operation in which the auxiliary compressor 95 is driven is called an auxiliary heating operation.
- the heating operation that is not the auxiliary heating operation will be referred to as normal heating operation.
- the control device 9 performs normal heating operation when the heating load is equal to or greater than a predetermined threshold, and performs auxiliary heating operation when the heating load is less than the threshold.
- the heating load is estimated based on refrigerant pressure information, refrigerant temperature information, outdoor temperature information, indoor temperature information, and the like detected by sensors provided in the air conditioner 100, for example.
- the solenoid valves 42c, 42d and 42e of the relay machine B and the solenoid valve 93 of the auxiliary heat source machine E are opened, and the solenoid valves 41c, 41d and 41e of the relay machine B and the auxiliary heat source machine are opened.
- the E solenoid valve 92 is closed.
- the refrigerant that has flowed out of the auxiliary heat exchanger 73 flows to the repeater B through the auxiliary compressor pipe 91 during the auxiliary heating operation.
- FIG. 8 is a diagram showing the flow of refrigerant in auxiliary heating operation according to the third embodiment.
- the refrigerant that has flowed through the indoor heat exchanger 62c of the indoor unit C and the indoor heat exchanger 62d of the indoor unit D passes through the auxiliary heat exchanger 73 of the auxiliary heat source equipment E and the auxiliary compressor 95, and is again It becomes a flow that flows through the indoor heat exchanger 62c of the indoor unit C and the indoor heat exchanger 62d of the indoor unit D.
- the control device 9 stops the operation of the compressor 10 .
- the control device 9 opens the electromagnetic valves 42c, 42d and 42e of the relay machine B and the electromagnetic valve 93 of the auxiliary heat source machine E, and opens the electromagnetic valves 41c, 41d and 41e of the relay machine B. , and the electromagnetic valve 92 of the auxiliary heat source machine E are closed.
- auxiliary compressor 95 In this state, the operation of the auxiliary compressor 95 is started. Liquid refrigerant flowing out of the auxiliary heat exchanger 73 and flowing through the third refrigerant pipe 3 e passes through the electromagnetic valve 93 and the auxiliary accumulator 94 and is sucked into the auxiliary compressor 95 . The refrigerant compressed by the auxiliary compressor 95 into a high-temperature, high-pressure gas state passes through the check valve 96 and flows through the third refrigerant pipe 3e again. The high-temperature and high-pressure refrigerant flowing through the third refrigerant pipe 3 e flows into the first branch portion 31 .
- the refrigerant that has flowed into the first branch portion 31 flows into the indoor units C and D through the solenoid valves 42c and 42d.
- the high-temperature and high-pressure refrigerant that has flowed into the indoor units C and D is cooled while heating the indoor air in the indoor heat exchangers 62c and 62d, and becomes medium-temperature and medium-pressure liquid refrigerant.
- the medium-temperature, medium-pressure liquid refrigerant that has flowed out of the indoor heat exchangers 62c and 62d passes through the fifth flow control devices 61c and 61d and flows into the second branch portion 32.
- the medium-temperature and medium-pressure refrigerant that has flowed into the second branch 32 flows into the fourth refrigerant pipe 4e of the auxiliary heat source E again and circulates.
- the medium-temperature, medium-pressure refrigerant that has flowed into the fourth refrigerant pipe 4e is throttled by the fifth flow control device 61e, expands and decompresses, and becomes a low-temperature, low-pressure gas-liquid two-layer state. Then, the refrigerant is heated while exchanging heat with hot water through the auxiliary heat exchanger 73, becomes a high-temperature, low-pressure gas refrigerant, flows into the auxiliary accumulator 94 through the electromagnetic valve 93, and the refrigerant circulates.
- the outdoor heat exchanger 12 of the outdoor unit A is supplied with the refrigerant heated to a high temperature by the auxiliary heat exchanger 73 . Therefore, the air conditioner 100B can suppress frost formation on the outdoor heat exchanger during heating operation.
- auxiliary heat exchanger 73 heat is exchanged between the refrigerant flowing through the auxiliary heat source equipment E and hot water heated by a boiler or the like, so that the temperature of the refrigerant can be increased. Furthermore, by performing an auxiliary heating operation in which the refrigerant is circulated between the indoor units C and D and the auxiliary heat source equipment E using the auxiliary compressor 95, the heating operation is performed without operating the compressor 10 of the outdoor unit A. becomes possible.
- the air conditioner 100B can suppress frost formation on the outdoor heat exchanger 12 while continuing the heating operation.
- the auxiliary compressor 95 keeps the refrigerant at a high temperature and high pressure, so the heating capacity can be increased compared to the case where the refrigerant is circulated by a pump.
- the third embodiment may be combined with the second embodiment. That is, in addition to the configuration described in the second embodiment, the auxiliary heat source equipment E has an auxiliary compressor pipe 91, an electromagnetic valve 92, an electromagnetic valve 93, an auxiliary accumulator 94, an auxiliary compressor 95, and a check valve 96. can be
- the air conditioner may perform a cooling/heating mixed operation in which one of the indoor units C and D performs the heating operation and the other performs the cooling operation.
- the control state of the flow path switching device 11 and each solenoid valve is not limited to that described in the above embodiment, and the air conditioning load in each indoor unit, the heat supplied from the auxiliary heat source E, etc. Accordingly, switching of the connection state is appropriately performed.
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Abstract
Description
以下、本開示に係る空気調和装置100の実施の形態について、図面を参照しながら説明する。なお、以下の図面では各構成部材の大きさの関係が実際のものとは異なる場合がある。図1は、実施の形態1に係る空気調和装置100を示す回路図である。図1に示すように、空気調和装置100は、1台の室外機A、中継機B、室内機C及びD、並びに補助熱源機Eを有している。中継機Bは、室外機Aと、室内機C及びD並びに補助熱源機Eとの間に介在している。また、室内機C及びD並びに補助熱源機Eは、それぞれが並列に、中継機Bに接続されている。なお、本実施の形態1では、1台の室外機Aに対して、1台の中継機B、2台の室内機C及びD、並びに1台の補助熱源機Eが設けられている場合について例示しているが、それぞれの接続台数は図示している台数に限定されるものではない。空気調和装置100は、例えば2台以上の室外機を備えてもよいし、2台以上の中継機を備えてもよいし、1台又は3台以上の室内機を備えてもよいし、2台以上の補助熱源機を備えていてもよい。また、明細書全文に示す温度及び圧力等の高低については、特に絶対的な値との関係で高低が定まっているものではなく、装置における状態又は動作において相対的に定まるものとする。
室外機Aは、通常、ビル等の建物の外の屋上等の空間に配置され、中継機Bを介して室内機C及びD並びに補助熱源機Eに、冷熱又は温熱を供給するものである。なお、室外機Aは、室外に設置される場合に限らず、例えば換気口が形成された機械室等の囲まれた空間に設置されてもよい。また、室外機Aは、排気ダクトで廃熱を建物の外に排気することができる場合、建物の内部に設置されてもよい。また、室外機Aは、水冷式の室外機として建物の内部に設置されるようにしてもよい。このように、室外機Aは、廃熱の処理方法を確保することができれば、どのような場所に設置されていてもよい。また、室外機Aには、室外温度を計測するセンサ(図示せず)が設けられている。
中継機Bは、第1分岐部31、第2分岐部32、第3分岐部33、電磁弁41c~41e及び42c~42e、気液分離装置51、第2バイパス配管52、第3バイパス配管53、第3流量制御装置54、第4流量制御装置55、第1熱交換器56、並びに第2熱交換器57を有している。また、中継機Bの内部には、第3冷媒配管3c~3e、及び第4冷媒配管4c~4eが引き込まれている。
室内機C及びDは、室内等の空調対象空間に空調空気を供給できる位置に設置され、中継機Bを介して供給された室外機Aからの冷熱又は温熱により、空調対象空間に冷房空気又は暖房空気を供給するものである。室内機Cは、第5流量制御装置61c、室内熱交換器62c、及び室内ファン63cを有する。以下では、室内機Dの詳細な説明は省略するが、室内機Dも室内機Cと同様に、第5流量制御装置61d、室内熱交換器62d、及び室内ファン63dを有し、それぞれの機器の構成は、室内機Cのそれぞれの機器と同じである。また、室内機C及びDには、室内温度を計測するセンサ(図示せず)が設けられている。
補助熱源機Eはボイラ等に接続された温水タンクF等の熱媒体から採熱し、室外機Aの室外熱交換器12に温熱を供給する。これにより、暖房運転における着霜の抑制、及び除霜運転に要する時間の短縮が図られる。補助熱源機Eは、第5流量制御装置61e、水配管71、水ポンプ72、補助熱交換器73を有する。また、室外機A、中継機B、室内機C及びD、並びに補助熱源機Eを備える空気調和装置100に温水タンクFを加えた構成を空気調和システムとする。
空気調和装置100には、制御装置9が設けられている。制御装置9は、例えばCPU(Central Processing Unit)及びメモリ9aを備えるマイクロコンピュータである。制御装置9は、メモリ9aに記憶されたプログラムをCPUで実行し、空気調和装置100の各機器を制御する。制御装置9は、空気調和装置100に設けられた各センサで検出された冷媒の圧力情報、冷媒の温度情報、室外温度情報及び室内温度情報等に基づいて、アクチュエータ等を制御する。例えば、制御装置9は、圧縮機10の駆動、流路切替装置11の切り替え、室外ファン13のファンモータの駆動、室内ファン63c~63eのファンモータの駆動、電磁弁41c~41e及び42c~42e、並びに各流量制御装置の開度を制御する。メモリ9aには、各制御値を決定する関数等が格納される。
次に、空気調和装置100が実行する各種運転時の運転動作について説明する。空気調和装置100には、冷房運転、暖房運転、及び除霜運転の3つの運転モードがある。冷房運転は、全ての室内機C及びDが冷房運転を行う運転モードである。暖房運転は、全ての室内機C及びDが暖房運転を行う運転モードである。除霜運転は、室外熱交換器12が着霜した場合に行われる運転モードである。詳細は以下で説明するが、実施の形態1の暖房運転を行うことによって、低外気温時においても、室外熱交換器12の着霜が抑制されている。実施の形態1の除霜運転は、外気温が極めて低く、室外熱交換器12が着霜した場合等に、短期間で室外熱交換器12の除霜を行うことができる。
図2は、実施の形態1に係る冷房運転における冷媒の流れを示す図である。なお、以下図2を含めて冷媒の流れを示す図では、閉止されている電磁弁にハッチングを施して示している。冷房運転では、室外機Aの圧縮機10から送出された冷媒が室外熱交換器12を流れ、室内機Cの室内熱交換器62c及び室内機Dの室内熱交換器62dを並行して通過し、再び室外機Aの圧縮機10に戻る流れとなる。冷房運転が行われる場合、制御装置9は、図2に示すように、流路切替装置11の接続状態を、第6冷媒配管6と吐出管10bとが接続され、第1冷媒配管1と第5冷媒配管5とが接続される接続状態にする。これにより、圧縮機10から吐出された冷媒が室外熱交換器12に流れる。また、電磁弁41c及び41dは開放され、電磁弁42c、42d、41e及び42eは閉止される。
図3は、実施の形態1に係る暖房運転における冷媒の流れを示す回路図である。暖房運転では、室外機Aの圧縮機10から送出された冷媒が室内機Cの室内熱交換器62c及び室内機Dの室内熱交換器62dを流れ、補助熱源機Eの補助熱交換器73を経由して、室外熱交換器12に供給され、再び室外機Aの圧縮機10に戻る流れとなる。暖房運転が行なわれる場合、制御装置9は、図3に示すように、流路切替装置11の接続状態を、第1冷媒配管1と吐出管10bとが接続され、第5冷媒配管5と第6冷媒配管6とが接続される接続状態にする。また、電磁弁42c、42d及び41eは開放され、電磁弁41c、41d及び42eは閉止される。
図4は、実施の形態1に係る除霜運転における冷媒の流れを示す回路図である。除霜運転では、室外機Aの圧縮機10から送出された冷媒が室外熱交換器12を流れ、室内機Cの室内熱交換器62c及び室内機Dの室内熱交換器62d並びに補助熱源機Eの補助熱交換器73を並行して通過し、再び室外機Aの圧縮機10に戻る流れとなる。除霜運転が行なわれる場合、制御装置9は、図4に示すように、流路切替装置11の接続状態を、第6冷媒配管6と吐出管10bとが接続され、第1冷媒配管1と第5冷媒配管5とが接続される接続状態にする。これにより、圧縮機10から吐出された冷媒が室外熱交換器12に流れる。また、電磁弁41c、41d及び41eは開放され、電磁弁42c、42d及び42eは閉止される。
図5は、実施の形態2に係る空気調和装置100Aを示す回路図である。本実施の形態の空気調和装置100Aは、補助熱源機Eの構成が実施の形態1と相違する。空気調和装置100Aの室外機A、中継機B、並びに室内機C及びDの構成は、実施の形態1と同じである。
図6は、実施の形態2に係るポンプ暖房運転における冷媒の流れを示す図である。ポンプ暖房運転では、室内機Cの室内熱交換器62c及び室内機Dの室内熱交換器62dを流れた冷媒が、補助熱源機Eの補助熱交換器73及び冷媒ポンプ83を経由し、再び室内機Cの室内熱交換器62c及び室内機Dの室内熱交換器62dに流通する流れとなる。ポンプ暖房運転が行われる場合、制御装置9は、圧縮機10の運転を停止する。また、制御装置9は、図6に示すように、中継機Bの電磁弁42c、42d及び42e、並びに補助熱源機Eの電磁弁82を開放し、中継機Bの電磁弁41c、41d及び41eが閉止される。
図7は、実施の形態3に係る空気調和装置100Bを示す回路図である。本実施の形態の空気調和装置100Aは、補助熱源機Eの構成において、実施の形態1と相違する。空気調和装置100Bの室外機A、中継機B、並びに室内機C及びDの構成は、実施の形態1と同じである。
図8は、実施の形態3に係る補助暖房運転における冷媒の流れを示す図である。補助暖房運転では、室内機Cの室内熱交換器62c及び室内機Dの室内熱交換器62dを流れた冷媒が、補助熱源機Eの補助熱交換器73及び補助圧縮機95を経由し、再び室内機Cの室内熱交換器62c及び室内機Dの室内熱交換器62dに流通する流れとなる。ポンプ暖房運転が行われる場合、制御装置9は、圧縮機10の運転を停止する。また、制御装置9は、図6に示すように、中継機Bの電磁弁42c、42d及び42e、並びに補助熱源機Eの電磁弁93を開放し、中継機Bの電磁弁41c、41d及び41e、並びに補助熱源機Eの電磁弁92を閉止する。
Claims (8)
- 冷媒を圧縮する圧縮機を有する室外機と、前記室外機と接続された中継機と、前記中継機に接続された室内機と、を備え、前記圧縮機の駆動により、前記室外機、前記中継機及び前記室内機の間を冷媒が循環する空気調和装置であって、
前記室内機と並列になるように前記中継機に接続された補助熱源機を備え、
前記室外機は、
内部を流れる冷媒と流体との間で熱交換を行う室外熱交換器を有し、
前記補助熱源機は、
内部を流れる冷媒と温水との間で熱交換を行う補助熱交換器を有する
空気調和装置。 - 制御装置を更に備え、
前記室外機は、
冷媒の流路を切り替える流路切替弁を更に有し、
前記中継機は、
前記中継機と、前記室内機及び前記補助熱源機とにおける冷媒の流通の有無を切り替える複数の弁を有し、
前記室内機は、
内部を流れる冷媒と流体との間で熱交換を行う室内熱交換器を有し、
前記制御装置は、運転モードに応じて前記流路切替弁と複数の前記弁とを制御する。
請求項1に記載の空気調和装置。 - 前記制御装置は、
前記圧縮機の吐出側と前記中継機とが接続されるように前記流路切替弁を切り替え、前記圧縮機から吐出された冷媒が前記室内熱交換器を流れ、前記室内熱交換器を流れた冷媒が前記補助熱交換器を経由して、前記室外熱交換器に供給されるように複数の前記弁を切り替えて、暖房運転を実行する
請求項2に記載の空気調和装置。 - 前記制御装置は、
前記圧縮機の吐出側と前記室外熱交換器とが接続されるように前記流路切替弁を切り替え、前記圧縮機から送出された冷媒が前記室外熱交換器を流れ、前記室内熱交換器と前記補助熱源機とを並行して通過し、前記圧縮機に戻るように複数の前記弁を切り替えて、除霜運転を実行する
請求項2又は3に記載の空気調和装置。 - 前記中継機は、
前記室外機との間を低圧の冷媒が流れる第1冷媒配管と、高圧の冷媒が流れる第2冷媒配管とによって接続され、
前記室内機及び前記補助熱源機との間を前記第1冷媒配管から分岐する複数の第3冷媒配管と、前記第2冷媒配管から分岐する複数の第4冷媒配管によって接続され、
複数の前記第3冷媒配管は、それぞれ前記中継機側で分岐し、一方が前記第1冷媒配管に接続され、他方が前記第2冷媒配管に接続され、
複数の前記弁は、前記第3冷媒配管の分岐の一方と他方とにそれぞれ設けられている
請求項2~4の何れか1項に記載の空気調和装置。 - 前記補助熱源機は、
前記第3冷媒配管又は前記第4冷媒配管に接続されたポンプ配管と、
前記ポンプ配管に設けられ、冷媒を送出する冷媒ポンプと、を更に有し、
前記制御装置は、
前記室外機の前記圧縮機を停止させ、前記冷媒ポンプを駆動させ、前記室内熱交換器を流れた冷媒が、前記補助熱交換器及び前記冷媒ポンプを経由して、前記室内熱交換器に戻るように複数の前記弁を切り替えて、ポンプ暖房運転を実行する
請求項5に記載の空気調和装置。 - 前記補助熱源機は、
前記第3冷媒配管又は前記第4冷媒配管に接続された補助圧縮機配管と、
前記補助圧縮機配管に設けられ、冷媒を圧縮する補助圧縮機と、を更に有し、
前記制御装置は、
前記室外機の前記圧縮機を停止させ、前記補助圧縮機を駆動させ、前記室内熱交換器を流れた冷媒が、前記補助熱交換器及び前記補助圧縮機を経由して、前記室内熱交換器に戻るように複数の前記弁を切り替えて、補助暖房運転を実行する
請求項5又は6に記載の空気調和装置。 - 請求項1~7の何れか1項に記載の空気調和装置と、
前記補助熱交換器に温水を供給する温水タンクと、を備える
空気調和システム。
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WO2024252471A1 (ja) * | 2023-06-05 | 2024-12-12 | 三菱電機株式会社 | 冷凍サイクル装置 |
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JP2017067318A (ja) * | 2015-09-28 | 2017-04-06 | パナソニックIpマネジメント株式会社 | 空気調和装置 |
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JP7370505B1 (ja) * | 2023-04-24 | 2023-10-27 | 三菱電機株式会社 | 空気調和装置 |
WO2024224453A1 (ja) * | 2023-04-24 | 2024-10-31 | 三菱電機株式会社 | 空気調和装置 |
WO2024252471A1 (ja) * | 2023-06-05 | 2024-12-12 | 三菱電機株式会社 | 冷凍サイクル装置 |
WO2024252473A1 (ja) * | 2023-06-05 | 2024-12-12 | 三菱電機株式会社 | 冷凍サイクル装置 |
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US20240151438A1 (en) | 2024-05-09 |
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