WO2016103702A1 - Climatiseur à régénération - Google Patents

Climatiseur à régénération Download PDF

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Publication number
WO2016103702A1
WO2016103702A1 PCT/JP2015/006434 JP2015006434W WO2016103702A1 WO 2016103702 A1 WO2016103702 A1 WO 2016103702A1 JP 2015006434 W JP2015006434 W JP 2015006434W WO 2016103702 A1 WO2016103702 A1 WO 2016103702A1
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WIPO (PCT)
Prior art keywords
heat exchanger
refrigerant
heat storage
heat
outdoor
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PCT/JP2015/006434
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English (en)
Japanese (ja)
Inventor
修二 藤本
安尾　晃一
柯壁 陳
拓哉 中尾
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ダイキン工業株式会社
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Publication of WO2016103702A1 publication Critical patent/WO2016103702A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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

Definitions

  • the present invention relates to a regenerative air conditioner that cools a room using a heat storage medium as a cold heat source.
  • Patent Document 1 a heat storage type air conditioner that performs indoor cooling using a heat storage medium as a cooling source (hereinafter referred to as “utilizing cooling operation”) is known.
  • a heat storage heat exchanger having a flow path through which a refrigerant passes is disposed in a heat storage tank that stores the heat storage medium, and the heat storage medium is cooled by the refrigerant.
  • an outdoor heat exchanger, a heat storage heat exchanger, and an indoor heat exchanger are connected by piping to form a refrigerant circuit.
  • the outdoor heat exchanger, the heat storage heat exchanger, and the indoor heat exchanger are included in the outdoor unit, the heat storage unit, and the indoor unit, respectively.
  • the piping connecting the heat storage heat exchanger and the indoor heat exchanger may be long, or the height difference between the heat storage unit and the indoor unit may increase to near the allowable height difference.
  • the present invention has been made in view of such a point, and an object thereof is to prevent generation of flash gas during use cooling operation and to reduce power consumption of a heat storage type air conditioner.
  • the first aspect of the present disclosure includes an outdoor unit (20a) having an outdoor circuit (11a) to which a compressor (21) that compresses a refrigerant and an outdoor heat exchanger (22) that exchanges heat between the refrigerant and air are connected. ), An indoor expansion valve (26) for depressurizing the refrigerant, and an indoor unit (20b) to which an indoor heat exchanger (27) for exchanging heat between the refrigerant and the air is connected, and the refrigerant, An intermediate circuit (11c) to which a heat storage heat exchanger (37) for exchanging heat with the heat storage medium and a first heat exchanger (29) capable of cooling the refrigerant after passing through the heat storage heat exchanger (37) are connected.
  • the outdoor circuit (11a), the intermediate circuit (11c), and the indoor circuit (11b) are connected in series.
  • the exchanger (22) and the heat storage heat exchanger (37) function as a condenser, and the indoor heat exchanger (27)
  • a cooling cycle is performed to circulate the refrigerant so as to function as a cooler.
  • the refrigerant that has passed through the heat storage heat exchanger (37) is further passed through the first heat exchanger (29).
  • the regenerative air conditioner is characterized in that the refrigerant cooled and further cooled by the first heat exchanger (29) is decompressed by the indoor expansion valve (26).
  • the first heat exchanger (29) is provided in the heat storage unit (50) and on the refrigerant outlet side of the heat storage heat exchanger (37).
  • the refrigerant is condensed in the outdoor heat exchanger (22) of the outdoor unit (20a) and the heat storage heat exchanger (37) of the heat storage unit (50).
  • the refrigerant is then further cooled by the first heat exchanger (29) of the heat storage unit (50), and then is connected to the indoor unit (20b) via a pipe connecting the heat storage unit (50) and the indoor unit (20b).
  • the pressure is reduced. That is, the cooled refrigerant flows into the indoor expansion valve (26) more than when the first heat exchanger (29) is not provided. Thereby, even if the liquid refrigerant whose pressure has decreased flows into the indoor expansion valve (26), generation of flash gas in the indoor expansion valve (26) can be prevented.
  • the heat storage heat exchanger (37) is condensed in the outdoor heat exchanger (22), but the refrigerant before being cooled in the first heat exchanger (29) Inflow. Therefore, the refrigerant flowing into the heat storage heat exchanger (37) has sufficient room to be further cooled by the heat storage medium, so that sufficient heat can be obtained from the heat storage medium in the heat storage heat exchanger (37). it can.
  • the first heat exchanger (29) in the use cooling cycle, is configured to supercool the refrigerant in the vicinity of the inlet of the first heat exchanger (29).
  • the regenerative air conditioner further cools the refrigerant when the degree does not reach the target degree of supercooling.
  • the outdoor circuit (11a) includes a second heat that can cool the refrigerant that has passed through the outdoor heat exchanger (22).
  • An exchanger (24) is further connected, and the refrigerant circuit (11) further includes a bypass circuit (18) capable of bypassing the heat storage heat exchanger (37), and the refrigerant circuit (11)
  • a simple cooling cycle in which the refrigerant circulates through the bypass circuit (18) from the outdoor heat exchanger (22) functioning as a condenser to the indoor heat exchanger (27) functioning as an evaporator is performed.
  • the first heat exchanger (29) does not cool the refrigerant
  • the second heat exchanger (24) is a regenerative air conditioner that cools the refrigerant.
  • the second heat exchanger (24) in the outdoor unit (20a) is used in the simple cooling cycle, and the heat storage unit ( The first heat exchanger (29) in 50) is used.
  • the heat storage medium is a heat storage material in which a clathrate hydrate is generated by cooling
  • the outdoor side The circuit (11a) is further connected with a second heat exchanger (24) capable of cooling the refrigerant after passing through the outdoor heat exchanger (22), and the intermediate circuit (11c) is connected with the heat storage.
  • a preheating heat exchanger (36) for exchanging heat between the refrigerant before passing through the heat exchanger (37) and the heat storage medium is further connected, and the heat storage unit (50) is connected to the heat storage heat exchanger ( 37), a heat storage device to which the preheating heat exchanger (36) and a pump (63) for circulating the heat storage medium from the preheating heat exchanger (36) to the heat storage heat exchanger (37) are connected.
  • the heat storage medium heated by the refrigerant in the heat exchanger for preheating (36) is transferred in the heat exchanger for heat storage (37).
  • the second heat exchanger (24) does not cool the refrigerant
  • the first heat exchanger (29) cools the refrigerant. It is a heat storage air conditioner.
  • the refrigerant condensed in the outdoor heat exchanger (22) flows into the preheating heat exchanger (36) without being cooled in the second heat exchanger (24), and the preheating heat
  • the heat storage medium is heated by the exchanger (36).
  • a refrigerant having a higher temperature flows into the preheating heat exchanger (36) than that cooled by the second heat exchanger (24). Therefore, the preheating heat exchanger (36) can warm the heat storage medium with the refrigerant and melt the clathrate hydrate contained in the heat storage medium. Therefore, it is possible to prevent the inside of the pipe connecting at least the preheating heat exchanger (36) to the heat storage heat exchanger (37) from being blocked by clathrate hydrate.
  • the second heat exchanger (24) does not cool the refrigerant, but the first heat exchanger (29) cools the refrigerant. Therefore, generation of flash gas in the indoor expansion valve (26) can be reliably prevented.
  • the generation of flash gas in the indoor expansion valve (26) is prevented, and the cold energy of the heat storage medium can be fully utilized, so that the power consumption of the heat storage air conditioner (10) Can be reduced.
  • the refrigerant when the refrigerant is not sufficiently cooled, the refrigerant is cooled using the first heat exchanger (29), so that flash gas is generated in the indoor expansion valve (26). Can be reliably prevented.
  • the second heat exchanger (24) in the outdoor unit (20a) is used in the simple cooling cycle, and the cooling cycle used. 1 uses the first heat exchanger (29) in the heat storage unit (50).
  • the fourth aspect it is possible to prevent the inside of the pipe connecting at least the preheating heat exchanger (36) to the heat storage heat exchanger (37) from being blocked by clathrate hydrate, It is also possible to reliably prevent flash gas from being generated in the indoor expansion valve (26).
  • FIG. 1 is a configuration diagram of a heat storage type air conditioner.
  • FIG. 2 is a diagram illustrating the refrigerant flow during the simple cooling operation.
  • FIG. 3 is a diagram illustrating the flow of the refrigerant during the simple heating operation.
  • FIG. 4 is a diagram illustrating the flow of the refrigerant and the heat storage medium during the cold storage operation.
  • FIG. 5 is a diagram illustrating each flow of the refrigerant and the heat storage medium during the use cooling operation.
  • FIG. 6 is a diagram illustrating the flow of the refrigerant and the heat storage medium during the cooling and storing operation.
  • the heat storage type air conditioner (10) is a system that can store cold energy in a heat storage tank (62) described later, and can cool the room using the stored cold energy. Furthermore, the heat storage type air conditioner (10) can cool the room while storing cold heat in the heat storage tank (62).
  • the regenerative air conditioner (10) includes an outdoor unit (20a), an indoor unit (20b), a heat storage unit (50), a controller (100) (corresponding to an operation control unit), It has a refrigerant circuit (11) and a heat storage circuit (61).
  • the controller (100) is for controlling the operation of the regenerative air conditioner (10).
  • the controller (100) controls the drive of the compressor (21) of the refrigerant circuit (11) and the circulation pump (63) of the heat storage circuit (61), and controls the opening and closing of a plurality of on-off valves (25, 39, 40, 41). I do.
  • the refrigerant circuit (11) is filled with a refrigerant, and a refrigeration cycle is performed by circulating the refrigerant.
  • the refrigerant circuit (11) is connected to the outdoor circuit (11a) included in the outdoor unit (20a), the intermediate circuit (11c) included in the heat storage unit (50), and the indoor unit (20b).
  • the indoor side circuit (11b) included is connected in series.
  • the compressor (21), the indoor heat exchanger (22), and the outdoor supercooling heat exchanger (24) (corresponding to the second heat exchanger) are connected by various pipes. Yes.
  • the indoor expansion valve (26) and the indoor heat exchanger (27) are connected by various pipes.
  • a preheating heat exchanger (36), a heat storage expansion valve (38), a heat storage heat exchanger (37), a fourth on-off valve (41), and a heat storage side subcooling heat exchanger ( 29) (corresponding to the first heat exchanger) is connected.
  • the refrigerant circuit (11) mainly includes a compressor (21), an outdoor heat exchanger (22), an outdoor expansion valve (23), an outdoor supercooling heat exchanger (24) (second heat exchanger). 1) on-off valve (25), heat storage side subcooling heat exchanger (29) (corresponding to the first heat exchanger), indoor expansion valve (26), indoor heat exchanger (27), and four-way switching valve (28).
  • the compressor (21), outdoor heat exchanger (22), outdoor expansion valve (23), outdoor subcooling heat exchanger (24) and four-way switching valve (28) are provided in the outdoor unit (20a).
  • the indoor expansion valve (26) and the indoor heat exchanger (27) are provided in the indoor unit (20b).
  • the first on-off valve (25) and the heat storage side subcooling heat exchanger (29) are provided in the heat storage unit (50).
  • Compressor (21) compresses and discharges refrigerant.
  • the compressor (21) is a variable capacity type, and the rotation speed (operation frequency) is changed by an inverter circuit (not shown).
  • the outdoor heat exchanger (22) is connected to the four-way switching valve (28) through the pipe (12).
  • the outdoor heat exchanger (22) is, for example, a cross fin and tube type, and when outdoor air is supplied by an outdoor fan (22a) provided in the outdoor unit (20a), heat of the outdoor air and the refrigerant is generated. Exchange.
  • the outdoor expansion valve (23) is connected to the outdoor heat exchanger (22) via the pipe (13), and is connected to the outdoor subcooling heat exchanger (24) via the pipe (14a).
  • the outdoor expansion valve (23) is composed of, for example, an electronic expansion valve, and adjusts the flow rate of the refrigerant by changing the opening degree.
  • the outdoor supercooling heat exchanger (24) includes a high-pressure side passage (24a) connected to the outdoor expansion valve (23) via a pipe (14a), an inlet side of the high-pressure side passage (24a), and a compressor ( 21) and a low-pressure side passage (24b) connected to the suction side.
  • the outdoor supercooling heat exchanger (24) the refrigerant flowing through the high pressure side passage (24a) is supercooled by heat exchange between the refrigerants flowing through the high pressure side passage (24a) and the low pressure side passage (24b). It is comprised so that. That is, the outdoor supercooling heat exchanger (24) can cool the refrigerant after passing through the outdoor heat exchanger (22).
  • the flow rate of the refrigerant flowing through the low-pressure side passage (24b) is adjusted by the expansion valve (24c).
  • the first on-off valve (25) is connected to the high-pressure side passage (24a) of the outdoor subcooling heat exchanger (24) via the pipe (14b), and the heat storage side subcooling heat exchange via the pipe (14c). Connected to the vessel (29).
  • the first on-off valve (25) is constituted by, for example, an electromagnetic valve, and allows or stops the flow of refrigerant between the pipes (14b, 14c).
  • a check valve (25a) is connected in parallel with the first on-off valve (25). The check valve (25a) is provided so that the refrigerant flows from the heat storage side subcooling heat exchanger (29) side to the outdoor side subcooling heat exchanger (24) side during simple heating operation described later. .
  • the part up to the junction is called the bypass circuit (18).
  • the bypass circuit (18) is included in the refrigerant circuit (11), and bypasses a portion of the intermediate circuit (11c) from the preheating heat exchanger (36) to the heat storage heat exchanger (37). Circuit.
  • the heat storage side subcooling heat exchanger (29) has a high pressure side passage (29a) and a low pressure side passage (29b).
  • One end of the high-pressure side passage (29a) is connected to the pipe (14c), and the other end is connected to the indoor expansion valve (26) via the pipe (14d).
  • One end of the low pressure side passage (29b) is connected to the inlet side of the high pressure side passage (29a) via the pipe (17), and the other end is connected to the pipe (16) (the suction side of the compressor (21)).
  • the refrigerant flowing through the high pressure side passage (29a) is supercooled by heat exchange between the refrigerants flowing through the high pressure side passage (29a) and the low pressure side passage (29b). It is comprised so that.
  • the flow rate of the refrigerant flowing through the low-pressure side passage (29b) is adjusted by the expansion valve (29c) provided on the pipe (17).
  • Such a heat storage side subcooling heat exchanger (29) can cool the refrigerant after passing through the heat storage heat exchanger (37) during the cooling operation.
  • the indoor expansion valve (26) is connected to the indoor heat exchanger (27) via the pipe (15).
  • the indoor expansion valve (26) is composed of, for example, an electronic expansion valve, and adjusts the circulation amount of the refrigerant by changing the opening degree, or depressurizes the refrigerant.
  • the indoor heat exchanger (27) is connected to the four-way switching valve (28) via the pipe (16).
  • the indoor heat exchanger (27) is, for example, a cross fin and tube type, and when indoor air is supplied by an indoor fan (27a) provided in the indoor unit (20b), heat exchange between the air and the refrigerant is performed. I do. The air after the heat exchange by the indoor heat exchanger (27) is supplied to the room again.
  • the four-way switching valve (28) has four ports. Specifically, the first port of the four-way switching valve (28) is connected to the discharge side of the compressor (21), and the second port of the four-way switching valve (28) is connected to the compressor (21 via an accumulator (not shown). ) Is connected to the suction side.
  • the third port of the four-way switching valve (28) is connected to the outdoor heat exchanger (22) via the pipe (12), and the fourth port of the four-way switching valve (28) is connected to the indoor via the pipe (16). Connected to heat exchanger (27).
  • the four-way switching valve (28) has a connection state of each port in a first state (state shown by a solid line in FIG. 1) or a second state (dashed line in FIG. 1) depending on the operation type of the heat storage air conditioner (10). Switch to the state indicated by.
  • the refrigerant circuit (11) includes a bypass flow path (31).
  • the bypass channel (31) is connected in parallel to the indoor heat exchanger (27), and the refrigerant passes through the inside.
  • one end of the bypass channel (31) is connected to a pipe (14b) between the outdoor supercooling heat exchanger (24) and the first on-off valve (25).
  • the other end of the bypass channel (31) is connected to a pipe (16) between the indoor heat exchanger (27) and the fourth port of the four-way switching valve (28).
  • the bypass channel (31) mainly includes a preheating heat exchanger (36) and a heat storage heat exchanger (37), a heat storage expansion valve (38), and second to third on-off valves (39, 40). Have.
  • the portion from the heat exchanger (36) for preheating to the heat exchanger (37) for heat storage in the bypass channel (31) is a part of the intermediate circuit (11c).
  • the preheating heat exchanger (36) has a refrigerant side passage (36a) and a heat storage side passage (36b).
  • the refrigerant side passage (36a) is located on the pipe (32), that is, between one end of the bypass flow path (31) and the heat storage expansion valve (38), and the refrigerant flows therein.
  • the heat storage side passage (36b) is connected in series to the heat storage circuit (61), and a heat storage medium (described later) flows inside.
  • the preheating heat exchanger (36) performs heat exchange between the refrigerant and the heat storage medium. That is, the preheating heat exchanger (36) exchanges heat between the refrigerant before heat exchange with the heat storage heat exchanger (37) and the heat storage medium.
  • the heat storage heat exchanger (37) has a refrigerant side passage (37a) and a heat storage side passage (37b).
  • the refrigerant side passage (37a) is located between the heat storage expansion valve (38) and the third on-off valve (40) on the pipe (33), and the refrigerant flows inside.
  • the heat storage side passage (37b) is connected in series to the heat storage circuit (61), and the heat storage medium flows inside.
  • the heat storage heat exchanger (37) can cool the heat storage medium by exchanging heat between the refrigerant and the heat storage medium. That is, the heat storage heat exchanger (37) heat-exchanges the refrigerant after heat exchange with the preheating heat exchanger (36) with the heat storage medium.
  • the heat storage expansion valve (38) is connected between the refrigerant side passage (36a) of the preheating heat exchanger (36) and the refrigerant side passage (37a) of the heat storage heat exchanger (37).
  • the heat storage expansion valve (38) is composed of, for example, an electronic expansion valve, and adjusts the pressure and the circulation amount of the refrigerant by changing the opening degree.
  • the second on-off valve (39) is connected in series with the check valve (39a).
  • the second on-off valve (39) and the check valve (39a) connected in series to each other are connected in parallel to the heat storage expansion valve (38).
  • the check valve (39a) allows only the flow of the refrigerant from the preheating heat exchanger (36) side to the heat storage heat exchanger (37) side.
  • the third on-off valve (40) is provided on the pipe (34). One end of the pipe (34) is connected to the pipe (33), and the other end of the pipe (34) is connected to the pipe (16).
  • a pressure relief valve (44) is provided in parallel with the heat storage expansion valve (38).
  • the pressure relief valve (44) is a valve for releasing the pressure when the pressure on the heat storage heat exchanger (37) side exceeds the allowable value, for example, when the heat storage air conditioner (10) is stopped. It is.
  • the refrigerant circuit (11) further includes a first branch channel (35).
  • One end of the first branch channel (35) is connected to the connection point of the pipes (33, 34) in the bypass channel (31), and the other end of the first branch channel (35) is connected to the pipe (14c). It is connected.
  • the first branch channel (35) mainly has a fourth on-off valve (41) and a check valve (41a), and is a part of the intermediate circuit (11c).
  • the fourth on-off valve (41) and the check valve (41a) are connected in series with each other.
  • the check valve (41a) allows only the refrigerant flow from the pipe (33) side to the pipe (14c) side.
  • the refrigerant circuit (11) further includes a second branch channel (42).
  • One end of the second branch channel (42) is a connection point of the pipes (33, 34) in the bypass channel (31), that is, a connection point between the bypass channel (31) and the first branch channel (35). It is connected to the.
  • the other end of the second branch channel (42) is connected to the pipe (16).
  • the second branch channel (42) mainly has an evaporation pressure adjusting valve (43).
  • the evaporation pressure adjusting valve (43) is a valve for adjusting the evaporation pressure of the refrigerant in the heat storage heat exchanger (37), and is constituted by, for example, an expansion valve.
  • the evaporation pressure adjustment valve (43) is basically kept in a fully closed state.
  • the heat storage circuit (61) is filled with a heat storage medium, and a cold storage cycle is performed in which the heat storage medium is circulated to store cold heat.
  • the heat storage circuit (61) mainly includes, in addition to the heat storage tank (62) and the circulation pump (63), each heat storage side passage (36b) of the heat exchanger for preheating (36) and the heat exchanger for heat storage (37) described above. 37b).
  • the heat storage medium a heat storage material in which clathrate hydrate is generated by cooling, that is, a fluid heat storage material is employed.
  • the heat storage medium may be one in which a solid component is generated at a temperature higher than 0 ° C. and lower than 20 ° C. by cooling.
  • the solid component refers to a component that has undergone phase transition (latent heat change) from a liquid at its melting point and is in an exothermic state.
  • Specific examples of the heat storage medium include tetra nbutylammonium bromide (TBAB) aqueous solution, tetramethylolethane (TME) aqueous solution, paraffinic slurry, etc.
  • an aqueous solution of tetra-n-butylammonium bromide maintains the state of the aqueous solution even in a supercooled state in which the temperature of the aqueous solution is lower than the hydrate formation temperature after being stably cooled.
  • the supercooled solution transitions to a solution containing clathrate hydrate (ie, slurry).
  • the aqueous solution of tetra-n-butylammonium bromide eliminates the supercooled state, and clathrate hydrate (hydrate crystal) composed of tetra-n-butylammonium bromide and water molecules is generated, and the viscosity is relatively low. It becomes a high slurry state.
  • the supercooled state refers to a state where the clathrate hydrate is not generated and the state of the solution is maintained even when the heat storage medium becomes a temperature lower than the hydrate generation temperature.
  • a tetra nbutylammonium bromide aqueous solution containing tetra nbutylammonium bromide is employed as the heat storage medium.
  • the heat storage medium is preferably a medium having a concentration near the harmonic concentration.
  • the harmonic concentration is about 40%.
  • the hydrate formation temperature of the aqueous solution of tetra-n-butylammonium bromide is about 12 ° C.
  • the hydrate formation temperature of the aqueous solution of tetra-n-butylammonium bromide varies depending on the concentration of the heat storage medium. For example, when the concentration of the heat storage medium is about 20%, the hydrate formation temperature is about 8.5 ° C.
  • the harmonic concentration means a concentration at which the concentration of the aqueous solution does not change before and after the clathrate hydrate is formed.
  • the heat storage tank (62) is a hollow container and stores a heat storage medium.
  • the heat storage tank (62) is formed in a cylindrical shape closed at both ends, and is arranged so that its axial direction is the vertical direction.
  • An outlet and an inlet are formed in the heat storage tank (62), and the outlet is located, for example, above the inlet.
  • the circulation pump (63) circulates the heat storage medium between the heat storage tank (62), the preheating heat exchanger (36), and the heat storage heat exchanger (37) in the heat storage circuit (61).
  • the direction of circulation of the heat storage medium is that the heat storage medium flowing out of the heat storage tank (62) passes through the heat storage side passage (36b) of the heat exchanger for preheating (36) and then passes through the circulation pump (63) for heat storage. It passes through the heat storage side passage (37b) of the heat exchanger (37) and flows into the heat storage tank (62).
  • the on / off operation of the circulation pump (63) and the flow rate of the heat storage medium are controlled by the controller (100).
  • the heat storage circuit (61) is a closed circuit.
  • Examples of the operation type of the heat storage type air conditioner (10) include simple cooling operation, simple heating operation, cold storage operation, utilization cooling operation, and cooling storage operation.
  • the controller (100) controls various devices in the refrigerant circuit (11) and the heat storage circuit (61) so that these operations are performed.
  • the simple cooling operation is an operation for cooling the room using only the cooling heat obtained by the cooling cycle of the refrigerant circuit (11).
  • the simple heating operation is an operation for heating the room using only the heat obtained by the heating cycle of the refrigerant circuit (11).
  • the cold storage operation is an operation in which cold heat obtained by the cold storage cycle of the heat storage circuit (61) is stored in the heat storage tank (62).
  • the use cooling operation is an operation for cooling the room using the heat storage medium in the heat storage tank (62) as a cooling heat source.
  • the cooling storage operation in the heat storage circuit (61), the cold energy obtained in the cold storage cycle is stored in the heat storage tank (62), while the refrigerant circuit (11) uses only the cold energy obtained in the cooling cycle to cool the room. It is a driving to be performed. That is, cold storage and cooling are performed simultaneously in the cooling storage operation.
  • the refrigerant circuit (11) performs a cooling cycle in which the outdoor heat exchanger (22) serves as a condenser and the indoor heat exchanger (27) serves as an evaporator.
  • the refrigerant flows from the outdoor heat exchanger (22) functioning as a condenser to the indoor heat exchanger (27) functioning as an evaporator through a bypass circuit (18) through a refrigerant circuit (11 ) Circulate inside.
  • This refrigerant circulation operation is called a simple cooling cycle.
  • the refrigerant does not flow into the bypass channel (31) and the first branch channel (35), and the heat storage circuit (61) does not circulate the heat storage medium.
  • the opening degree of the heat storage expansion valve (38) is set to a fully closed state
  • the on-off valve (39 of the bypass channel (31) and the first branch channel (35)). 41) is set to the closed state.
  • the on-off valve (40) of the bypass channel (31) is set to an open state in order to prevent refrigerant from accumulating in the refrigerant side passage (37a) of the heat storage heat exchanger (37).
  • the circulation pump (63) is stopped.
  • the four-way switching valve (28) is set to the first state, and the first on-off valve (25) is set to the open state.
  • the opening degree of the outdoor expansion valve (23) is set to a fully opened state, the expansion valve (29c) of the heat storage side subcooling heat exchanger (29) is fully closed, and the opening degree of the indoor expansion valve (26) is a predetermined opening degree. (The opening degree at which the degree of superheat of the refrigerant at the outlet of the indoor heat exchanger (27) becomes the target degree of superheat).
  • the compressor (21), the outdoor fan (22a), and the indoor fan (27a) operate.
  • the refrigerant discharged from the compressor (21) flows into the outdoor heat exchanger (22) through the pipe (12), and dissipates heat to the outdoor air and condenses while passing through the outdoor heat exchanger (22). .
  • the refrigerant condensed in the outdoor heat exchanger (22) flows into the outdoor subcooling heat exchanger (24) through the pipe (13) and the outdoor expansion valve (23), and is further cooled. Further, the cooled refrigerant passes through the piping (14b, 14c, 14d), the first on-off valve (25), and the indoor expansion valve (26) via the high pressure side passage (29a) of the heat storage side subcooling heat exchanger (29). The pressure is reduced by the indoor expansion valve (26).
  • the refrigerant decompressed by the indoor expansion valve (26) flows into the indoor heat exchanger (27) through the pipe (15) and absorbs heat from the indoor air while passing through the indoor heat exchanger (27). Evaporate. Thereby, indoor air is cooled.
  • the refrigerant evaporated in the indoor heat exchanger (27) is sucked into the compressor (21) through the pipe (16) and compressed again.
  • the refrigerant circuit (11) performs a heating cycle in which the indoor heat exchanger (27) serves as a condenser and the outdoor heat exchanger (22) serves as an evaporator. Similar to the simple cooling operation, the refrigerant does not flow into the bypass flow path (31) and the first branch flow path (35), and the heat storage circuit (61) does not circulate the heat storage medium.
  • the four-way selector valve (28) is set to the second state.
  • the opening degree of the indoor expansion valve (26) is set to a predetermined opening degree (an opening degree at which the degree of refrigerant subcooling at the outlet of the indoor heat exchanger (27) becomes the target degree of subcooling).
  • the expansion valve (29c, 24c) of each subcooling heat exchanger (29, 24) is fully closed, the first on-off valve (25) is closed, and the opening of the outdoor expansion valve (23) is a predetermined opening (
  • the degree of superheat of the refrigerant at the outlet of the outdoor heat exchanger (22) is set to the target degree of superheat).
  • the compressor (21), the outdoor fan (22a), and the indoor fan (27a) operate.
  • the refrigerant discharged from the compressor (21) flows into the indoor heat exchanger (27) through the pipe (16), and dissipates heat to the indoor air while passing through the indoor heat exchanger (27) to condense. .
  • the refrigerant condensed in the indoor heat exchanger (27) is divided into various pipes (15, 14d to 14a), indoor expansion valves (26), high pressure side passages (29a, 24a) and the check valve (25a) to the outdoor expansion valve (23), and the pressure is reduced by the outdoor expansion valve (23).
  • the decompressed refrigerant flows into the outdoor heat exchanger (22) through the pipe (13), and evaporates by absorbing heat from the outdoor air while passing through the outdoor heat exchanger (22).
  • the evaporated refrigerant is sucked into the compressor (21) through the pipe (12) and compressed again.
  • the four-way switching valve (28) is set to the first state
  • the third on-off valve (40) is set to the open state
  • the second on-off valve (39) and the fourth on-off valve (41) are set to the closed state.
  • the The first on-off valve (25) is set in the open state.
  • liquid refrigerant accumulates in the pipe (liquid pipe) from the branch point to the bypass flow path (31) to the indoor expansion valve (26). This is because the refrigerant is in the same state as in the simple cooling operation, and generation of excess refrigerant is prevented.
  • the opening of the outdoor expansion valve (23) is fully open, the expansion valve (24c, 29c) of each subcooling heat exchanger (24, 29) is fully closed, and the opening of the indoor expansion valve (26) is fully open.
  • the opening degree of the heat storage expansion valve (38) is a predetermined opening degree (an opening degree at which the refrigerant evaporation temperature at the outlet of the refrigerant side passage (37a) of the heat storage heat exchanger (37) becomes the target evaporation temperature).
  • the compressor (21) operates at a substantially constant rotational speed.
  • the outdoor fan (22a) is activated and the indoor fan (27a) is stopped.
  • the refrigerant discharged from the compressor (21) flows into the outdoor heat exchanger (22) through the pipe (12), and dissipates heat to the outdoor air and condenses in the outdoor heat exchanger (22).
  • the condensed refrigerant flows into the pipe (14b) through the pipe (13, 14a), the outdoor expansion valve (23), and the high pressure side passage (24a) of the outdoor subcooling heat exchanger (24). Since the first on-off valve (25) is in the open state, the refrigerant accumulates in the pipe from the branch point to the bypass flow path (31) in the pipe (14b) to the indoor expansion valve (26).
  • the circulation pump (63) operates.
  • the heat storage medium in the heat storage tank (62) flows out of the tank (62) and flows into the heat storage side passage (36b) of the preheating heat exchanger (36).
  • the heat storage medium is heated by the refrigerant flowing through the refrigerant side passage (36a).
  • the heated heat storage medium flows into the heat storage side passage (37b) of the heat storage heat exchanger (37) through the circulation pump (63).
  • the heat storage medium is cooled by the refrigerant flowing through the refrigerant side passage (37a).
  • the cooled heat storage medium flows into the heat storage tank (62). In this way, cold heat is stored in the heat storage tank (62).
  • the room is cooled using the cold heat stored in the heat storage tank (62) and the cold heat obtained by the refrigeration cycle of the refrigerant circuit (11). That is, the refrigerant condensed and cooled in the outdoor heat exchanger (22) is further subjected to indoor heat exchange after obtaining cold energy from the heat storage medium in the preheating heat exchanger (36) and the heat storage heat exchanger (37).
  • the room air is cooled by evaporating in the vessel (27).
  • Such a circulation operation of the refrigerant is referred to as a utilization cooling cycle.
  • the heat storage circuit (61) causes the heat storage medium flowing out from the heat storage tank (62) to pass through the preheating heat exchanger (36) and the heat storage heat exchanger (37) in order, and to flow into the heat storage tank (62) again. Circulate the heat storage medium.
  • the outdoor heat exchanger (22) is a condenser and the indoor heat exchanger (27) is an evaporator.
  • both the preheating heat exchanger (36) and the heat storage heat exchanger (37) serve as a supercooler (condenser), and the refrigerant passes through the bypass flow path (31). Flows to the first branch channel (35).
  • the four-way switching valve (28) is in the first state
  • the first on-off valve (25) and the third on-off valve (40) are in the closed state
  • the second on-off valve (39) and the fourth on-off valve (41). are set to the open state.
  • the degree of opening of the outdoor expansion valve (23) and the heat storage expansion valve (38) is fully open
  • the expansion valve (24c) of the outdoor subcooling heat exchanger (24) is fully closed
  • the indoor expansion valve (26) is open.
  • the degree is set to a predetermined opening degree (an opening degree at which the superheat degree of the refrigerant at the outlet of the indoor heat exchanger (27) becomes the target superheat degree).
  • the compressor (21), the outdoor fan (22a), and the indoor fan (27a) operate.
  • the refrigerant discharged from the compressor (21) flows into the outdoor heat exchanger (22) through the pipe (12), and dissipates heat to the outdoor air and condenses in the outdoor heat exchanger (22).
  • the condensed refrigerant flows into the pipe (14b) through the fully expanded outdoor expansion valve (23) and the high pressure side passage (24a) of the outdoor subcooling heat exchanger (24). Since the first on-off valve (25) is in the closed state, the refrigerant does not flow into the bypass circuit (18) but flows into the bypass channel (31) in the middle of the pipe (14b).
  • the refrigerant flowing into the bypass channel (31) is further cooled by the heat storage medium flowing through the heat storage side passage (36b) while passing through the refrigerant side passage (36a) of the preheating heat exchanger (36), and then fully opened.
  • the refrigerant flowing into the heat storage heat exchanger (37) is further cooled by the heat storage medium flowing through the heat storage side passage (37b) while passing through the refrigerant side passage (37a).
  • This refrigerant flows into the pipe (14c) through the first branch flow path (35). Thereafter, the refrigerant flows into the heat storage side subcooling heat exchanger (29) and is further cooled.
  • the cooled refrigerant flows into the indoor expansion valve (26) through the pipe (14d).
  • the indoor heat exchanger (27) absorbs heat from the indoor air and evaporates. Thereby, indoor air is cooled.
  • the evaporated refrigerant is sucked into the compressor (21) through the pipe (16) and the four-way switching valve (28) and is compressed again.
  • the circulation pump (63) operates.
  • the heat storage medium in the heat storage tank (62) flows out of the tank (62) and flows into the heat storage side passage (36b) of the preheating heat exchanger (36).
  • the heat storage medium absorbs heat from the refrigerant flowing through the refrigerant side passage (36a).
  • the heat storage medium that has absorbed heat flows into the heat storage side passageway (37b) of the heat storage heat exchanger (37) through the circulation pump (63).
  • the heat storage medium While passing through the heat storage side passage (37b), the heat storage medium further absorbs heat from the refrigerant flowing through the refrigerant side passage (37a). Further, the heat storage medium that has absorbed heat flows into the heat storage tank (62). In this way, cold heat is applied from the heat storage medium to the refrigerant.
  • the outdoor heat exchanger (22) is a condenser and the indoor heat exchanger (27) is an evaporator.
  • the preheating heat exchanger (36) is a supercooler (that is, a radiator), and the heat storage heat exchanger (37) is an evaporator.
  • coolant does not flow into a 1st branch flow path (35).
  • the four-way switching valve (28) is in the first state
  • the first on-off valve (25) and the third on-off valve (40) are in the open state
  • the second on-off valve (39) and the fourth on-off valve (41). Are each set to the closed state.
  • the opening degree of the outdoor expansion valve (23) is fully open
  • the expansion valve (24c) of the outdoor supercooling heat exchanger (24) is fully closed
  • the heat storage expansion valve (38) and the indoor expansion valve (26) are open.
  • the degree of opening is controlled by the controller (100) for adjusting the refrigerant flow rate.
  • the compressor (21), the outdoor fan (22a), and the indoor fan (27a) operate.
  • the refrigerant discharged from the compressor (21) flows into the outdoor heat exchanger (22) through the pipe (12), and dissipates heat to the outdoor air and condenses in the outdoor heat exchanger (22).
  • the condensed refrigerant passes through the outdoor expansion valve (23) that is fully open and the high-pressure side passage (24a) of the outdoor supercooling heat exchanger (24). Since the first on-off valve (25) is in the open state and the heat storage expansion valve (38) is not in the fully closed state, the refrigerant flowing out of the outdoor supercooling heat exchanger (24) In the middle of the flow, it branches and flows into the first on-off valve (25) side and the bypass flow path (31) side.
  • the refrigerant that has flowed to the first opening / closing valve (25) side flows into the high pressure side passage (29a) of the heat storage side subcooling heat exchanger (29) through the pipe (14c), and is further cooled. Further, the cooled refrigerant flows into the indoor expansion valve (26) through the pipe (14d) and is decompressed by the indoor expansion valve (26). The refrigerant decompressed by the indoor expansion valve (26) absorbs heat from the indoor air and evaporates by the indoor heat exchanger (27). Thereby, indoor air is cooled.
  • the refrigerant flowing to the bypass channel (31) side flows into the refrigerant side passage (36a) of the preheating heat exchanger (36) through the pipe (32) and passes through the refrigerant side passage (36a).
  • the heat storage medium flowing through the heat storage side passage (36b) is heated.
  • the clathrate hydrate contained in the heat storage medium flowing out from the heat storage tank (62) is melted. Therefore, the clathrate hydrate of the heat storage medium in the pipe (including the heat storage side passage (37b) of the heat storage heat exchanger (37)) through which the heat storage medium passes through the preheat heat exchanger (36).
  • the refrigerant is not cooled in the outdoor supercooling heat exchanger (24). If the refrigerant is cooled in the outdoor supercooling heat exchanger (24), the effect of the refrigerant heating the heat storage medium in the preheating heat exchanger (36) is reduced, and the heat storage circuit by clathrate hydrate This is because (61) is likely to be blocked.
  • the refrigerant that has heated the heat storage medium in the preheating heat exchanger (36) flows out of the preheating heat exchanger (36) in a cooled state, and is depressurized by the heat storage expansion valve (38). Thereafter, in the heat storage heat exchanger (37), the refrigerant absorbs heat from the heat storage medium flowing through the heat storage side passage (37b) and evaporates while passing through the refrigerant side passage (37a).
  • the evaporated refrigerant flows through the third on-off valve (40) and the pipe (34), and merges with the refrigerant that has passed through the indoor heat exchanger (27) in the pipe (16).
  • the merged refrigerant is sucked into the compressor (21) through the four-way switching valve (28) and compressed again.
  • the circulation pump (63) operates.
  • the heat storage medium in the heat storage tank (62) flows out of the tank (62) and flows into the heat storage side passage (36b) of the preheating heat exchanger (36).
  • the heat storage medium While passing through the heat storage side passage (36b), the heat storage medium is heated by absorbing heat from the refrigerant flowing through the refrigerant side passage (36a). Thereby, the clathrate hydrate contained in the heat storage medium is melted.
  • the heat storage medium that has absorbed heat flows into the heat storage side passageway (37b) of the heat storage heat exchanger (37) through the circulation pump (63).
  • the heat storage medium is cooled by the refrigerant flowing through the refrigerant side passage (37a).
  • the cooled heat storage medium flows into the heat storage tank (62). In this way, cold heat is stored in the heat storage tank (62).
  • the opening degree of the evaporating pressure adjusting valve (43) is set to the fully closed state and the third on-off valve (40) is set to the open state is given.
  • the third on-off valve (40) may be set in a closed state, and the opening degree of the evaporation pressure adjusting valve (43) may be adjusted to a predetermined opening degree.
  • the refrigerant flowing out of the heat storage heat exchanger (37) is depressurized in the evaporation pressure regulating valve (43), and sequentially passes through the pipe (16) and the four-way switching valve (28), so that the compressor (21) Will be inhaled.
  • the refrigerant evaporation pressure in the heat storage heat exchanger (37) can be made higher than the suction pressure of the compressor (21), and the refrigerant evaporation in the heat storage heat exchanger (37) can be achieved. It is possible to prevent the temperature from becoming too low. Thereby, it can be prevented that the heat storage medium is excessively cooled in the heat storage heat exchanger (37), so that a large amount of clathrate hydrate is generated and the circulation efficiency of the heat storage medium is lowered.
  • the outdoor unit (20a) is provided with the outdoor supercooling heat exchanger (24) (corresponding to the second heat exchanger), but also the heat storage unit (50).
  • a heat storage side subcooling heat exchanger (29) (corresponding to the first heat exchanger) is provided.
  • the heat storage side subcooling heat exchanger (29) not only prevents flash gas from being generated in the indoor expansion valve (26), but also fully utilizes the cold energy of the heat storage medium in the heat storage tank (62).
  • the heat storage unit (50) is provided.
  • both the outdoor unit (20a) and the heat storage unit (50) are installed outdoors, and the indoor unit (20b) is installed indoors.
  • the indoor unit (20b) is installed indoors.
  • the outdoor unit (20a) and the heat storage unit (50) are installed on the roof of the building, and the indoor unit (20b ) Is installed in each room below the roof and away from the roof. Therefore, the pipe connecting the heat storage unit (50) and the indoor unit (20b) is necessarily longer than the pipe connecting the outdoor unit (20a) and the heat storage unit (50).
  • the purpose is to reduce the amount of power consumption by performing cooling using the cooling heat of the heat storage medium as much as possible.
  • the refrigerant is condensed in the outdoor heat exchanger (22), passes through the high pressure side passage (24a) of the outdoor subcooling heat exchanger (24), and then used for preheating. Cold heat is applied from the heat storage medium in the heat exchanger (36) and the heat storage heat exchanger (37). If the refrigerant is supercooled by the outdoor supercooling heat exchanger (24) instead of providing the heat storage side supercooling heat exchanger (29), the refrigerant is sufficiently cooled. Generation of flash gas in the valve (26) can be prevented.
  • the refrigerant is cooled to some extent by the outdoor subcooling heat exchanger (24) before flowing into the heat storage heat exchanger (37), the refrigerant and the heat storage medium in the heat storage heat exchanger (37)
  • the temperature difference is smaller than when the outdoor supercooling heat exchanger (24) does not perform cooling. Therefore, the amount of cold that the refrigerant obtains from the heat storage medium in the heat storage heat exchanger (37) is small, and therefore it is difficult to say that cooling is performed using the cold heat of the heat storage medium as much as possible. Therefore, the reduction in power consumption of the regenerative air conditioner (10), which is the original purpose of the cooling operation, is diminished.
  • the effect of reducing power consumption is secured.
  • the preheating heat exchanger (36) and the heat storage A method of increasing the amount of cold that the refrigerant obtains from the heat storage medium in the heat exchanger (37) for use is also conceivable.
  • the heat storage side subcooling is provided in the heat storage unit (50) and on the refrigerant outflow side of the heat storage heat exchanger (37) (that is, on the outlet side of the refrigerant side passage (37a) during use cooling operation).
  • a heat exchanger (29) is provided.
  • the outdoor supercooling heat exchanger (24) does not function as a supercooler (condenser) during the use cooling operation in which a refrigerant cooling cycle is performed in the refrigerant circuit (11).
  • the supercooling heat exchanger (29) functions as a supercooler. As shown in FIG.
  • the refrigerant after passing through the heat storage heat exchanger (37) is further cooled by the heat storage side subcooling heat exchanger (29), and the further cooled refrigerant is the heat storage unit (50). And then flows into the indoor expansion valve (26) of the indoor unit (20b) and is decompressed by the indoor expansion valve (26).
  • the outdoor subcooling heat exchanger (24) is not used, but the refrigerant condensed in the outdoor heat exchanger (22) is used as it is for the preheating heat exchanger (36) and the heat storage heat exchange.
  • the refrigerant is allowed to flow into the vessel (37), and the cold energy of the heat storage medium is applied to the refrigerant to the maximum extent.
  • the refrigerant that has flowed into the indoor unit (20b) has already obtained the maximum amount of cold heat from the heat storage medium, and is further cooled by the heat storage side subcooling heat exchanger (29). It is in. Therefore, even if the pressure of the refrigerant flowing into the indoor unit (20b) decreases due to pressure loss due to the connecting pipe between the units (50, 20b), flash gas is generated in the indoor expansion valve (26). There is no. That is, it can be said that the regenerative air conditioner (10) according to the present embodiment has both prevention of generation of flash gas and reduction of power consumption.
  • the controller (100) sets the expansion valve (29c) of the heat storage side subcooling heat exchanger (29) to the fully closed state and stops the refrigerant cooling operation by the heat storage side subcooling heat exchanger (29). To do.
  • the controller (100) performs heat storage side subcooling heat exchange.
  • the expansion valve (29c) of the container (29) is opened to cause the heat storage side supercooling heat exchanger (29) to perform the cooling operation of the refrigerant.
  • the target degree of supercooling refers to the degree of supercooling when the target is to cool the refrigerant to the extent that no flash gas is generated in the indoor expansion valve (26).
  • the target supercooling degree is the pressure loss between the heat storage unit (50) and the indoor unit (20b), which is grasped by trial operation, and the heat storage unit (50) and It is determined by the controller (100) performing an operation based on the height difference of the indoor unit (20b). That is, the target supercooling degree is appropriately determined according to the installation environment and operating conditions of the regenerative air conditioner (10).
  • the cooling operation of the refrigerant of the heat storage side subcooling heat exchanger (29) during the use cooling operation can be performed even if the maximum cooling heat of the heat storage medium in the heat storage tank (62) is obtained. This is performed when there is a possibility that a flash gas is generated in (26) (that is, cooling of the refrigerant is insufficient). And if cooling of a refrigerant
  • the heat storage side subcooling heat exchanger (29) of the present embodiment is used not only during the cooling use operation but also during the cooling storage operation. As shown in FIG. 6, in the cooling and regenerating operation, the outdoor supercooling heat exchanger (24) does not perform the refrigerant subcooling operation, and the heat storage side subcooling heat exchanger (29) performs the refrigerant subcooling operation. . This is due to the following reason.
  • the refrigerant is cooled not by the heat storage side subcooling heat exchanger (29) but by the outdoor side subcooling heat exchanger (24).
  • the cooled refrigerant is more cooled than in the case where the outdoor supercooling heat exchanger (24) does not perform the refrigerant subcooling operation.
  • the preheating heat exchanger (36) heats the heat storage medium flowing out from the heat storage tank (62) once with the refrigerant, so that the heat storage medium in a substantially solution state in which the clathrate hydrate is dissolved is obtained. It plays a role of flowing out into the heat storage circuit (61).
  • the preheating heat exchanger (36) cannot sufficiently heat the heat storage medium by the refrigerant.
  • the heating effect of the heat storage medium in the preheating heat exchanger (36) is weakened, the heat storage medium containing the clathrate hydrate that is not melted circulates in the heat storage circuit (61). In such a heat storage medium, the transition to the clathrate hydrate proceeds while circulating in the heat storage circuit (61) from the preheating heat exchanger (36) to the heat storage heat exchanger (37).
  • the heat exchanger for preheating (36) heats the heat storage medium with the refrigerant and flows out the heat storage medium in which the clathrate hydrate is melted. Therefore, the heat storage circuit (61) is not clogged with clathrate hydrate, and therefore the solution state heat storage medium flowing out from the preheating heat exchanger (36) is the heat storage heat exchanger (37). It is cooled by flowing into. Furthermore, since the refrigerant is cooled in the heat storage side subcooling heat exchanger (29), flash gas is not generated in the indoor expansion valve (26) even during the cooling and cold storage operation.
  • the heat storage side subcooling heat exchanger (29) is not used, but the outdoor side subcooling heat exchanger (24) is used.
  • the heat storage side subcooling heat exchanger (29) is provided in the heat storage unit (50) and on the refrigerant outlet side of the heat storage heat exchanger (37).
  • the refrigerant is condensed in the outdoor heat exchanger (22) of the outdoor unit (20a) and the heat storage heat exchanger (37) of the heat storage unit (50).
  • the refrigerant is then further cooled by the heat storage side subcooling heat exchanger (29) of the heat storage unit (50), and then connected to the indoor unit via a pipe connecting the heat storage unit (50) and the indoor unit (20b).
  • the pressure is reduced by flowing into the indoor expansion valve (26b) of (20b).
  • the refrigerant that has been cooled flows more into the indoor expansion valve (26) than when the heat storage side subcooling heat exchanger (29) is not provided. Thereby, even if the liquid refrigerant whose pressure has decreased flows into the indoor expansion valve (26), generation of flash gas in the indoor expansion valve (26) can be prevented.
  • the heat storage heat exchanger (37) is condensed in the outdoor heat exchanger (22) but before being cooled in the heat storage side subcooling heat exchanger (29). Flows in. Therefore, the refrigerant flowing into the heat storage heat exchanger (37) has sufficient room to be further cooled by the heat storage medium, so that sufficient heat can be obtained from the heat storage medium in the heat storage heat exchanger (37). it can.
  • the heat storage side subcooling heat exchanger ( 29) further cools the refrigerant. That is, even during the cooling operation, when the refrigerant is not sufficiently cooled and flash gas may be generated in the indoor expansion valve (26), the heat storage side subcooling heat exchanger (29) Is used. For this reason, it is possible to reliably prevent the flash gas from being generated in the indoor expansion valve (26).
  • the outdoor supercooling heat exchanger (24) in the outdoor unit (20a) is used, and in the use cooling operation.
  • the heat storage side subcooling heat exchanger (29) in the heat storage unit (50) is used.
  • the refrigerant condensed in the outdoor heat exchanger (22) during the cooling and accumulating operation is not cooled in the outdoor subcooling heat exchanger (24) to the preheating heat exchanger (36). Then, the heat storage medium is heated by the preheating heat exchanger (36). Thereby, a refrigerant having a higher temperature flows into the preheating heat exchanger (36) than that cooled by the second heat exchanger (24). Therefore, the preheat heat exchanger (36) warms the heat storage medium with the refrigerant and melts the clathrate hydrate contained in the heat storage medium.
  • the heat storage medium may be a medium that generates clathrate hydrates by cooling, and may be a heat storage material other than tetra nbutyl ammonium bromide aqueous solution containing tetra n butyl ammonium bromide. Further, the concentration of the heat storage medium may not be limited to 40%.
  • the heat storage medium may be water.
  • the structure for cooling the heat storage medium may be a structure in which a heat storage heat exchanger is arranged in the heat storage tank instead of the structure of the heat storage circuit (61).
  • the refrigerant may be always cooled by the heat storage side subcooling heat exchanger (29).
  • the refrigerant cooling operation by the heat storage side subcooling heat exchanger (29) is further performed. It may be broken.
  • the outdoor subcooling heat exchanger (24) may not necessarily be provided in the outdoor unit (20a).
  • the present invention is useful for a regenerative air conditioner that cools an indoor space using a heat storage medium as a cold heat source.

Abstract

L'invention concerne un climatiseur qui vise à empêcher la production de vapeur instantanée et réduire la consommation d'énergie, pendant un fonctionnement de réfrigération d'utilisation, dans lequel une unité de stockage de chaleur (50) comprend un échangeur de chaleur de super-refroidissement (29) du côté stockage de chaleur permettant de refroidir du fluide frigorigène qui est passé dans un échangeur de chaleur (37) pour le stockage de chaleur. Un circuit du côté extérieur (11a), un circuit intermédiaire (11c) pour l'unité de stockage de chaleur (50) et un circuit du côté intérieur (11b) sont raccordés en série et un fonctionnement de réfrigération d'utilisation est effectué dans lequel un échangeur de chaleur extérieur (22) et l'échangeur de chaleur (37) pour le stockage de chaleur servent de condenseurs et un échangeur de chaleur intérieur (27) sert d'évaporateur. Pendant ce fonctionnement, le fluide frigorigène qui est passé dans l'échangeur de chaleur (37) pour le stockage de chaleur est encore refroidi dans l'échangeur de chaleur de super-refroidissement (29) du côté stockage de chaleur et ensuite détendu par un détendeur intérieur (26).
PCT/JP2015/006434 2014-12-26 2015-12-24 Climatiseur à régénération WO2016103702A1 (fr)

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JP6052275B2 (ja) * 2014-12-26 2016-12-27 ダイキン工業株式会社 蓄熱式空気調和機
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