JP5333557B2 - Hot water supply air conditioning system - Google Patents

Abstract

This hot-water-supplying, air-conditioning system (1) is configured in a manner so as to be able to execute a hot-water-supply-side cold storage operation and an air-conditioning-side cold storage operation during a cold storage operation. In the hot-water-supply-side cold storage operation, a coolant is circulated in a hot-water-supply coolant circuit (40) in a manner so that a heating heat exchanger (48) functions as a radiator and a hot-water-supply-side heat exchanger (33) functions as an evaporator, and the thermal storage medium in a thermal storage tank (31) is cooled by means of the coolant flowing through the hot-water-supply-side heat exchanger (33). In the air-conditioning-side cold storage operation, the coolant is circulated in an air-conditioning coolant circuit (21) in a manner so that an outdoor heat exchanger (24) functions as a radiator and an air-conditioning-side heat exchanger (34) functions as an evaporator, and the thermal storage medium in the thermal storage tank (31) is cooled by means of the coolant flowing through the air-conditioning-side heat exchanger (34).

Description

    The present invention comprises a hot water supply device having a refrigerant circuit, an air conditioner, and a heat storage tank, and the refrigerant circuit of the hot water supply apparatus generates hot water for hot water supply by performing a refrigeration cycle and stores cold heat in the heat storage tank; The present invention relates to a hot water supply air conditioning system capable of performing a cooling operation using cold energy stored in a heat storage tank.

    Conventionally, it has a hot water supply device that has a refrigerant circuit for performing a refrigeration cycle and generates hot water with a radiator, and an air conditioner that air-conditions the interior of the room, and collects the cold heat generated in the evaporator of the hot water supply device for air conditioning A hot water supply air conditioning system used for cooling operation of the apparatus is known (see, for example, Patent Document 1 below).

    In the hot water supply air-conditioning system of Patent Document 1, the radiator of the hot water supply device is connected to the hot water storage tank, and exchanges heat between the water in the hot water storage tank and the refrigerant. Moreover, the evaporator of the hot water supply apparatus is connected to the heat storage tank, and exchanges heat between the heat storage medium in the heat storage tank and the refrigerant. With such a configuration, the refrigerant circulating in the refrigerant circuit of the hot water supply device absorbs heat from the heat storage medium in the heat storage tank in the evaporator, and heats the water in the hot water storage tank in the radiator using the absorbed heat. Therefore, in the hot water supply air-conditioning system of Patent Document 1, the cold energy obtained by the water heating operation for heating the water in the hot water storage tank is stored in the heat storage tank. The heat storage by the water heater operation is performed at midnight when the electricity rate is low.

    Moreover, in the hot water supply air conditioning system of patent document 1, the air conditioning apparatus is connected to the heat storage tank. The air conditioner cools the room during the day using the cold stored in the heat storage tank at midnight. Therefore, the electric power required to cool the room during the day decreases compared to the case where the cold energy of the heat storage tank is not used. In the hot water supply air-conditioning system of Patent Document 1, the cold energy generated in the evaporator of the hot water supply device is collected in the heat storage tank at midnight in this way, and the collected cold heat is used for indoor cooling during the daytime. Reduce costs.

JP 2005-257127 A

By the way, the amount of cold energy obtained by a late-night kettle operation is usually smaller than the amount of cold energy required for daytime cooling operation. In particular, in the summer when the demand for hot water supply is low and the cooling load is high, the amount of cooling required for the cooling operation reaches several times the amount of cooling obtained by the water heating operation.

    However, the cold energy stored in the heat storage tank in the hot water supply air-conditioning system of Patent Document 1 is only the cold energy obtained by the midnight water boiling operation. Therefore, only a part of the cooling load during the day can be treated only by the cold stored in the heat storage tank at midnight. Therefore, the conventional hot water supply air conditioning system that stores only the cold heat obtained by the water heater operation cannot sufficiently reduce the amount of power required to cool the room during the day, and the running cost of the hot water supply air conditioning system can be sufficiently reduced. There wasn't.

    The present invention has been made in view of such a point, and an object of the present invention is to generate hot water for hot water supply by a refrigerant circuit of a hot water supply device performing a refrigeration cycle and store cold in a heat storage tank, and a heat storage tank. In a hot water supply air-conditioning system capable of performing a cooling operation using the cold energy stored in the water, the running cost is reduced.

According to a first aspect of the present invention, there is provided a hot water storage tank (11) for storing hot water for hot water supply and a hot water supply refrigerant circuit (40) connected to a heating heat exchanger (48) for heating the water in the hot water storage tank (11). ), And an air conditioner that has an air conditioning refrigerant circuit (21) to which an indoor heat exchanger (27) and an outdoor heat exchanger (24) are connected, and that air-conditions the room (20), a heat storage tank (31) for storing the heat storage medium, and a hot water supply side heat exchanger (33) for exchanging heat between the refrigerant in the hot water supply refrigerant circuit (40) and the heat storage medium in the heat storage tank (31). And a heat storage device (30) having an air conditioning side heat exchanger (34) for exchanging heat between the refrigerant of the air conditioning refrigerant circuit (21) and the heat storage medium in the heat storage tank (31), A cold storage operation in which the heat storage device (30) cools the heat storage medium in the heat storage tank (31), and the air conditioner (20) supplies the refrigerant in the air conditioning refrigerant circuit (21). The refrigerant that circulates so as to flow from the air-conditioning side heat exchanger (34) to the indoor heat exchanger (27) so that the heat storage device (30) flows through the air-conditioning side heat exchanger (34) is supplied to the heat storage tank (31 ) Is configured to be executable, and during the cold storage operation, the hot water supply refrigerant circuit (40) of the hot water supply device (10) is connected to the heating heat exchanger (48). ) Is a radiator and the hot water supply side heat exchanger (33) is an evaporator, and the heat storage device (30) is placed in the heat storage tank (31) in the hot water supply side heat exchanger (33). Hot water supply side cold storage operation for cooling the heat storage medium, the air conditioning refrigerant circuit (21) of the air conditioner (20), the outdoor heat exchanger (24) serves as a radiator, and the air conditioning side heat exchanger (34) The refrigeration cycle becomes an evaporator, and the heat storage device (30) is the air conditioning side heat exchanger (34) Oite the heat storage tank (31) and the air conditioning side cool storage operation for cooling the heat storage medium in can be used simultaneously.

    In the first invention, the hot water supply air conditioning system performs the cold storage operation and the use cooling operation. During the cold storage operation, the heat storage medium in the heat storage tank (31) is cooled, and cold heat is stored in the heat storage tank (31). In the hot water supply air conditioning system during the cold storage operation, the hot water supply side cold storage operation and the air conditioning side cold storage operation are executed. On the other hand, the hot water supply air conditioning system in use cooling operation cools the room using the cold energy stored in the heat storage tank (31). During use cooling operation, the refrigerant circulating in the air conditioning refrigerant circuit (21) flows into the indoor heat exchanger (27) after being cooled in the air conditioning side heat exchanger (34), and is used for indoor cooling. .

    The hot water supply air conditioning system according to the first aspect of the invention performs the hot water supply side cold storage operation during the cold storage operation. During the hot water supply side cold storage operation, the refrigerant circulating in the hot water supply refrigerant circuit (40) dissipates heat in the heating heat exchanger (48) and absorbs heat in the hot water supply side heat exchanger (33). The hot water supply device (10) heats the water in the hot water storage tank (11) using the heat obtained in the heating heat exchanger (48), and the heat storage device (30) is a hot water supply side heat exchanger. The heat storage medium in the heat storage tank (31) is cooled using the cold energy obtained in (33). That is, during the hot water supply side cold storage operation, cold heat is obtained by the refrigeration cycle performed by the hot water supply refrigerant circuit (40) to heat the water in the hot water storage tank (11), and the obtained cold heat is converted into the heat storage device (30). Stored in the heat storage tank (31).

    Moreover, the hot water supply air conditioning system of 1st invention performs air-conditioning side cold storage operation | movement during cold storage operation. During this air conditioning side cold storage operation, the refrigerant circulating in the air conditioning refrigerant circuit (21) dissipates heat in the outdoor heat exchanger (24) and absorbs heat in the air conditioning side heat exchanger (34). And a thermal storage apparatus (30) cools the thermal storage medium in a thermal storage tank (31) using the cold energy obtained in the air-conditioning side heat exchanger (34). In other words, during the cooling operation on the air conditioning side, the refrigerant circulating in the air conditioning refrigerant circuit (21) releases the heat absorbed from the heat storage device (30) to the outdoor air and enters the heat storage tank (31) of the heat storage device (30). Cold energy is stored.

In the first invention, during the cold storage operation, the hot water supply side cold storage operation and the air conditioning side cold storage operation are simultaneously executed in parallel in the hot water supply air conditioning system.

    In a second aspect based on the first aspect, the heat storage device (30) is configured to circulate a heat storage medium between the hot water supply side heat exchanger (33) and the heat storage tank (31) ( 35a, 35b) and a second circulation path (35a, 35c) for circulating a heat storage medium between the air conditioning side heat exchanger (34) and the heat storage tank (31).

    In the second invention, during the cold storage operation, the heat storage medium cooled by the refrigerant flowing through the hot water supply side heat exchanger (33) flows into the heat storage tank (31) through the first circulation path (35a, 35b). As a result, cold heat is stored in the heat storage tank (31), and the heat storage medium cooled by the refrigerant flowing through the air conditioning side heat exchanger (34) flows into the heat storage tank (31) via the second circulation path (35a, 35c). By doing so, cold heat is stored in the heat storage tank (31). On the other hand, during the use cooling operation, the cooled heat storage medium in the heat storage tank (31) flows into the air-conditioning side heat exchanger (34) through the first circulation path (35a, 35b) and enters the air-conditioning refrigerant circuit. In (21), the room is cooled by cooling the refrigerant flowing into the indoor heat exchanger (27).

    In a third aspect based on the first aspect, the heat storage tank (31) is provided with a heat transfer tube (39) for exchanging heat between the refrigerant flowing through the heat storage medium and the heat storage medium, and the heat transfer tube (39). Doubles as the hot water supply side heat exchanger and the air conditioning side heat exchanger.

    In 3rd invention, the heat exchanger tube (39) provided in the thermal storage tank (31) serves as the hot water supply side heat exchanger and the air-conditioning side heat exchanger.

    In the hot water supply air conditioning system of the first invention, the hot water supply side cold storage operation and the air conditioning side cold storage operation can be performed during the cold storage operation. During the hot water supply side cold storage operation, a refrigeration cycle is performed in the hot water supply refrigerant circuit (40), and the hot water supply device (10) is heated by a hot water storage tank (10) using heat released from the refrigerant in the heating heat exchanger (48). 11) The water inside is heated, and the cold energy obtained in the hot water supply side heat exchanger (33) is stored in the heat storage tank (31) of the heat storage device (30). On the other hand, during the cold storage operation on the air conditioning side, a refrigeration cycle is performed in the refrigerant circuit for air conditioning (21), and the refrigerant radiates heat to the outdoor air in the outdoor heat exchanger (24), and is obtained in the air conditioning side heat exchanger (34). The generated cold energy is stored in the heat storage tank (31) of the heat storage device (30).

    As described above, according to the hot water supply air conditioning system of the first aspect of the present invention, by performing not only the hot water supply side cold storage operation but also the air conditioning side cold storage operation, a larger amount of cold energy is stored in the heat storage device ( It can be stored in the heat storage tank (31) of 30). Therefore, not only the cold heat obtained when heating the water in the hot water storage tank (11) but also the cold heat obtained by the refrigerant in the air conditioning refrigerant circuit (21) dissipating heat to the outdoor air is also stored in the heat storage device (30). Can be stored in tank (31). Therefore, according to the first aspect of the invention, the cold storage operation is performed at midnight when the power rate is low, and the hot water supply side cold storage operation and the air conditioning side cold storage operation are performed during the cold storage operation. A small amount of cold energy can be stored in the heat storage tank (31). As a result, the amount of power consumed to cool the room during the day can be sufficiently reduced, and the running cost of the hot water supply air conditioning system can be sufficiently reduced.

Moreover, according to 1st invention, compared with the case where air-conditioning side heat storage operation is performed after completion | finish of hot-water supply side heat storage operation by performing hot water supply side heat storage operation and air-conditioning side heat storage operation simultaneously in parallel, it requires. Time can be shortened.

    Further, according to the second invention, the first circulation path (35a, 35b) for circulating the heat storage medium between the hot water supply side heat exchanger (33) and the heat storage tank (31), and the air conditioning side heat exchanger ( 34) and the heat storage tank (31) are provided with the second circulation path (35a, 35c) for circulating the heat storage medium, so that the hot water supply side cold storage operation and the air conditioning side cold storage operation are performed simultaneously, and the hot water supply refrigerant. The cold heat obtained by the refrigeration cycle in the circuit and the cold heat obtained by the refrigeration cycle in the air conditioning refrigerant circuit can be stored in the same heat storage tank (31). Therefore, the hot water supply air conditioning system can be configured compactly.

    Moreover, according to 3rd invention, the hot water supply side heat exchanger and the air-conditioning side heat exchanger are comprised by the heat exchanger tube (39) provided in the thermal storage tank (31), The number of parts of a hot water supply air conditioning system Can be reduced. Therefore, the hot water supply air conditioning system can be configured at low cost.

FIG. 1 is a piping system diagram showing the configuration of the hot water supply air conditioning system of the first embodiment. FIG. 2 is a piping diagram illustrating the operation during the cold storage operation of the hot water supply air-conditioning system according to the first embodiment. FIG. 3 is a piping diagram illustrating an operation during the first use cooling operation of the hot water supply air-conditioning system according to the first embodiment. FIG. 4 is a piping diagram illustrating an operation during the second use cooling operation of the hot water supply air-conditioning system according to the first embodiment. FIG. 5 is a piping diagram illustrating an operation during the simple cooling operation of the hot water supply air-conditioning system according to the first embodiment. FIG. 6 is a piping diagram illustrating an operation during a heat storage operation of the hot water supply air-conditioning system according to the first embodiment. FIG. 7 is a piping system diagram showing an operation during the use heating operation of the hot water supply air conditioning system of the first embodiment. FIG. 8 is a piping diagram illustrating an operation during the simple heating operation of the hot water supply air conditioning system of the first embodiment. FIG. 9 is a piping diagram illustrating an operation during a simple hot water operation of the hot water supply air conditioning system of the first embodiment. FIG. 10 is a piping system diagram showing the configuration of the hot water supply air conditioning system of the second embodiment. FIG. 11 is a piping diagram illustrating an operation during a cold storage operation of the hot water supply air-conditioning system according to the second embodiment. FIG. 12 is a piping diagram illustrating an operation during the first use cooling operation of the hot water supply air-conditioning system according to the second embodiment. FIG. 13 is a piping diagram illustrating an operation during the second use cooling operation of the hot water supply air-conditioning system according to the second embodiment. FIG. 14 is a piping diagram illustrating an operation during a heat storage operation of the hot water supply air-conditioning system according to the second embodiment. FIG. 15 is a piping diagram illustrating an operation during a heating operation of the hot water supply air conditioning system according to the second embodiment. FIG. 16 is a piping diagram illustrating a second operation during the first use cooling operation of the hot water supply air-conditioning system according to the third embodiment. FIG. 17 is a piping diagram illustrating a third operation during the first use cooling operation of the hot water supply air-conditioning system according to the third embodiment. FIG. 18 is a piping diagram illustrating a second operation during the second use cooling operation of the hot water supply air-conditioning system according to the third embodiment. FIG. 19 is a piping diagram illustrating a third operation during the second usage cooling operation of the hot water supply air-conditioning system according to the third embodiment. FIG. 20 is a piping diagram illustrating the configuration of the hot water supply air conditioning system according to the fourth embodiment.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Embodiment 1>
FIG. 1 is a circuit configuration diagram of a hot water supply air conditioning system (1) according to the present invention. The hot water supply air conditioning system (1) includes a hot water supply device (10), an air conditioner (20), and a heat storage device (30). In this embodiment, the hot water supply air conditioning system (1) is configured by retrofitting a heat storage device (30) to an existing hot water supply device (10) and an air conditioner (20).

<Water heater>
The hot water supply device (10) includes a hot water storage tank (11), a water circuit (12), a hot water supply refrigerant circuit (40), and a fan (46a).

    The hot water tank (11) is a vertically long cylindrical tank. The hot water storage tank (11) has a water supply pipe connected to the bottom and a hot water supply pipe connected to the top. This hot water tank (11) stores hot water for hot water supply.

    The water circuit (12) has an inlet end connected to the bottom of the hot water tank (11) and an outlet end connected to the top of the hot water tank (11). The water circuit (12) is provided with a pump (13). A heating heat exchanger (48) for heating water in the water circuit (12) is connected to the discharge side of the pump (13) in the water circuit (12). The heating heat exchanger (48) is composed of a plate heat exchanger in which a plurality of primary side flow paths (48a) and secondary side flow paths (48b) are formed, and the secondary side flow path (48b). Is connected to the water circuit (12).

    The hot water supply refrigerant circuit (40) is a hot water supply added when retrofitting a low temperature side circuit (41) and a high temperature side circuit (42), each of which is a closed circuit filled with refrigerant, and a heat storage device (30) described later. It has a side connection pipe (50) and first and second three-way valves (51, 52). And, in the hot water supply refrigerant circuit (40), a cascade heat exchanger (43) is provided between the high temperature part of the low temperature side circuit (41) and the low temperature part of the high temperature side circuit (42) to perform the dual refrigeration cycle. Do.

    Specifically, in the low temperature side circuit (41), the compressor (44), the primary heat flow path (43a), the expansion valve (45), and the evaporator (46) in the cascade heat exchanger (43) are sequentially piped. Connected by. On the other hand, in the high temperature side circuit (42), the primary side flow path (48a), the expansion valve (49), and the secondary side of the cascade heat exchanger (43) of the compressor (47) and the heating heat exchanger (48). The flow path (43b) is connected to the pipe in order.

    Each of the compressors (44, 47) is a hermetic compressor in which a compression mechanism and an electric motor are housed in one casing, and has a compression mechanism composed of a scroll fluid machine.

    The cascade heat exchanger (43) is configured by a plate heat exchanger in which a plurality of primary side flow paths (43a) and secondary side flow paths (43b) are formed.

    The evaporator (46) is constituted by a so-called cross fin type heat exchanger, and a fan (46a) is provided in the vicinity thereof. The evaporator (46) evaporates by absorbing heat from the outdoor air by exchanging heat between the refrigerant and the air supplied by the fan (46a).

    The hot water supply side connection pipe (50) is connected to the low temperature side circuit (41) so as to bypass the evaporator (46). A first three-way valve (51) is connected to the inflow end of the hot water supply side connection pipe (50), and a second three-way valve (52) is connected to the outflow end. Moreover, although mentioned later for details, the primary side flow path (33a) of the hot water supply side heat exchanger (33) is connected to the hot water supply side connection piping (50).

    The first three-way valve (51) is connected between the expansion valve (45) of the low temperature side circuit (41) and the evaporator (46). The first three-way valve (51) connects the expansion valve (45) to the evaporator (46) and is disconnected from the hot water supply side connection pipe (50), and the expansion valve (45) is connected to the hot water supply side connection pipe (50). The state is switched to the state of being disconnected from the evaporator (46) through communication.

    On the other hand, the second three-way valve (52) is connected between the compressor (44) and the evaporator (46) of the low temperature side circuit (41). The first three-way valve (51) connects the compressor (44) to the evaporator (46) and is disconnected from the hot water supply side connection pipe (50), and the compressor (44) is connected to the hot water supply side connection pipe (50). The state is switched to the state of being disconnected from the evaporator (46) through communication.

<Air conditioning device>
The air conditioner (20) includes an air conditioning refrigerant circuit (21) that is a closed circuit filled with a refrigerant, an outdoor fan (24a), and three indoor fans (27a).

    The air conditioning refrigerant circuit (21) includes a main circuit (29), an air conditioning side connection pipe (53) added when retrofitting a heat storage device (30) to be described later, a first bypass pipe (54), 2 bypass piping (55) and the 3rd-8th three-way valve (56-61) are provided.

    The main circuit (29) includes a compressor (22), a four-way switching valve (23), an outdoor heat exchanger (24), an outdoor expansion valve (25), three indoor expansion valves (26), And three indoor heat exchangers (27).

    The compressor (22) has a discharge side connected to a first port of the four-way switching valve (23) and a suction side connected to a second port of the four-way switching valve (23). In the main circuit (29), the outdoor heat exchanger (24), the outdoor expansion valve (25), and the indoor expansion valve are sequentially arranged from the third port to the fourth port of the four-way switching valve (23). (26) and the indoor heat exchanger (27) are sequentially connected by piping. The three sets of indoor expansion valves (26) and the indoor heat exchanger (27) are connected in parallel.

    The compressor (22) is a hermetic compressor in which a compression mechanism and an electric motor are housed in one casing, and has a compression mechanism composed of a rolling piston type or oscillating piston type rotary fluid machine.

    The four-way switching valve (23) includes a first state (state indicated by a solid line in FIG. 1) in which the first port communicates with the third port and the second port communicates with the fourth port; The port is switched to a second state (state indicated by a broken line in FIG. 1) in which the port communicates with the fourth port and the second port communicates with the third port.

    The outdoor heat exchanger (24) is configured by a so-called cross fin type heat exchanger, and an outdoor fan (24a) is provided in the vicinity thereof. In the outdoor heat exchanger (24), the refrigerant exchanges heat with the outdoor air supplied by the outdoor fan (24a).

    The three indoor heat exchangers (27) are each constituted by a so-called cross fin type heat exchanger, and an indoor fan (27a) is provided in the vicinity thereof. In the indoor heat exchanger (27), air is conditioned in the room by exchanging heat between the refrigerant and the indoor air supplied by the indoor fan (27a).

    Each of the outdoor expansion valve (25) and the indoor expansion valve (26) is an electric expansion valve with a variable opening.

    The air conditioning side connection pipe (53) is connected in parallel to the pipe between the outdoor expansion valve (25) of the main circuit (29) and each indoor expansion valve (26). A third three-way valve (56) is connected to one end of the air conditioning side connection pipe (53), and a fourth three-way valve (57) is connected to the other end. Moreover, although mentioned later for details, the primary side flow path (34a) of the air-conditioning side heat exchanger (34) is connected to the air-conditioning side connection piping (53).

    The first bypass pipe (54) consists of a gas pipe connecting the third port of the four-way selector valve (23) of the main circuit (29) and the outdoor heat exchanger (24) and an air conditioning side connection pipe (53). It is connected to the middle part. A first three-way valve (58) is connected to one end of the first bypass pipe (54), and a sixth three-way valve (59) is connected to the other end.

    The second bypass pipe (55) includes a middle part of the gas pipe connecting the fourth port of the four-way switching valve (23) of the main circuit (29) and each indoor heat exchanger (27) and an air conditioning side connection pipe (53 ) Is connected to the middle part. A seventh three-way valve (60) is connected to one end of the second bypass pipe (55), and an eighth three-way valve (61) is connected to the other end.

    The third three-way valve (56) and the fourth three-way valve (57) are provided between the outdoor expansion valve (25) and each outdoor expansion valve (25) of the main circuit (29), respectively. 56) is connected to the outdoor expansion valve (25) side, and the fourth three-way valve (57) is connected to the indoor expansion valve (26) side. The third three-way valve (56) connects the outdoor expansion valve (25) to the fourth three-way valve (57) and shuts it off from the air conditioning side connection pipe (53) and the outdoor expansion valve (25) to the air conditioning side connection pipe. The state is switched to the state of being disconnected from the fourth three-way valve (57) by communicating with (53). The fourth three-way valve (57) includes a state in which each indoor expansion valve (26) communicates with the third three-way valve (56) and is disconnected from the air conditioning side connection pipe (53), and each indoor expansion valve (26) is on the air conditioning side. The connection pipe (53) communicates with the third three-way valve (56) and switches to a state where it is shut off.

    The fifth three-way valve (58) is connected to the middle part of the gas pipe connecting the third port of the four-way switching valve (23) of the main circuit (29) and the outdoor heat exchanger (24), and the sixth three-way valve (59) is connected to the third three-way valve (56) side of the air conditioning side heat exchanger (34) in the air conditioning side connection pipe (53). The fifth three-way valve (58) communicates the third port of the four-way switching valve (23) with the outdoor heat exchanger (24) and shuts off the first bypass pipe (54) and the four-way switching valve (23). The third port communicates with the first bypass pipe (54) and switches to a state where it is shut off from the outdoor heat exchanger (24). The sixth three-way valve (59) connects the air-conditioning side heat exchanger (34) with the third three-way valve (56) and shuts off the first bypass pipe (54) and the air-conditioning side heat exchanger (34). The first bypass pipe (54) communicates with the third three-way valve (56) and switches to a state where it is shut off.

    The seventh three-way valve (60) is connected to the middle part of the gas pipe connecting the fourth port of the four-way switching valve (23) of the main circuit (29) and each indoor heat exchanger (27). The valve (61) is connected to the fourth three-way valve (57) side of the air conditioning side heat exchanger (34) in the air conditioning side connection pipe (53). The seventh three-way valve (60) includes a state in which the fourth port of the four-way switching valve (23) communicates with each indoor heat exchanger (27) and is shut off from the second bypass pipe (55). The 4th port of this is connected to the 2nd bypass piping (55), and it switches to the state where it cuts off from each indoor heat exchanger (27). The eighth three-way valve (61) connects the air-conditioning side heat exchanger (34) to the fourth three-way valve (57) and shuts off the air-conditioning side heat exchanger (34) from the second bypass pipe (55). The second bypass pipe (55) communicates with the fourth three-way valve (57) and switches to a state where it is shut off.

<Heat storage device>
The heat storage device (30) includes a heat storage tank (31) and a heat storage medium circuit (32).

    The heat storage tank (31) is a rectangular parallelepiped tank. The heat storage tank (31) stores a latent heat utilization heat storage medium (for example, a TBAB (tetra-n-butylammonium bromide) aqueous solution, a TME (trimethylolethane) aqueous solution, a paraffin-based slurry, etc.) as a heat storage medium.

    The heat storage medium circuit (32) includes a hot water supply side heat exchanger (33), an air conditioning side heat exchanger (34), a circulation path (35), a pump (36), a first adjustment valve (37), A second regulating valve (38).

    The hot water supply side heat exchanger (33) is a plate heat exchanger in which a plurality of primary side flow paths (33a) and secondary side flow paths (33b) are formed, and flows through the primary flow path (33a). Heat exchange is performed between the fluid and the fluid flowing through the secondary channel (33b). A hot water supply side connection pipe (50) connected to the hot water supply refrigerant circuit (40) is connected to the primary flow path (33a) of the hot water supply side heat exchanger (33). A first branch pipe (35b) of a circulation path (35) described later is connected to the secondary flow path (33b) of the hot water supply side heat exchanger (33).

    The air conditioning side heat exchanger (34) is a plate heat exchanger in which a plurality of primary side flow paths (34a) and secondary side flow paths (34b) are formed, and flows through the primary side flow path (34a). Heat exchange is performed between the fluid and the fluid flowing through the secondary channel (34b). An air conditioning side connection pipe (53) connected to the air conditioning refrigerant circuit (21) is connected to the primary flow path (34a) of the air conditioning side heat exchanger (34). A second branch pipe (35c) of a circulation path (35) described later is connected to the secondary side flow path (34b) of the air conditioning side heat exchanger (34).

    The circulation path (35) includes an inflow pipe (35a), a first branch pipe (35b), and a second branch pipe (35c). The inlet end of the inflow pipe (35a) is connected to the bottom of the heat storage tank (31), and the inlet ends of the first branch pipe (35b) and the second branch pipe (35c) are connected to the outlet end. The exit ends of the first branch pipe (35b) and the second branch pipe (35c) are each connected to the top of the heat storage tank (31). The inflow pipe (35a) and the first branch pipe (35b) constitute a first circulation path for circulating the heat storage medium between the heat storage tank (31) and the hot water supply side heat exchanger (33). (35a) and the second branch pipe (35c) constitute a second circulation path for circulating the heat storage medium between the heat storage tank (31) and the air conditioning side heat exchanger (34).

    The pump (36) is provided in the inflow pipe (35a) of the circulation path (35). The first regulating valve (37) is provided on the upstream side of the secondary flow path (33b) of the hot water supply side heat exchanger (33) in the first branch pipe (35b). The second regulating valve (38) is provided on the upstream side of the secondary flow path (34b) of the air conditioning side heat exchanger (34) in the second branch pipe (35c).

-Driving action-
The operation of the hot water supply air conditioning system (1) will be described. The hot water supply air conditioning system (1) includes a cold storage operation, a first use cooling operation, a second use cooling operation, a simple cooling operation, a heat storage operation, a use heating operation, a simple heating operation, and a simple water heating operation. Do.

<Cool storage operation>
The cold storage operation will be described with reference to FIG. In the cold storage operation, the hot water supply air conditioning system (1) performs a hot water supply side heat storage operation and an air conditioning side heat storage operation. In the hot water supply side heat storage operation, the hot water supply device (10) performs the refrigeration cycle in the hot water supply refrigerant circuit (40) to heat the water in the hot water storage tank (11), while the cold storage heat (31 ) Cool the heat storage medium inside. On the other hand, in the air conditioning side heat storage operation, the air conditioner (20) performs the refrigeration cycle in the air conditioning refrigerant circuit (21), and cools the heat storage medium in the heat storage tank (31) with the cold heat obtained by the refrigeration cycle. The heat storage device (30) stores the cold heat obtained by the hot water supply side heat storage operation of the hot water supply device (10) and the cold heat obtained by the air conditioning side heat storage operation of the air conditioner (20) in the heat storage tank (31).

    In the hot water supply device (10), the first and second three-way valves (51, 52) allow the refrigerant to bypass the evaporator (46) and flow to the hot water supply side connection pipe (50) in the low temperature side circuit (41). Can be switched. That is, the first three-way valve (51) is switched to a state in which the expansion valve (45) of the low temperature side circuit (41) is communicated with the hot water supply side connection pipe (50) and is shut off from the evaporator (46). The three-way valve (52) is switched to a state in which the compressor (44) of the low temperature side circuit (41) is communicated with the hot water supply side connection pipe (50) and shut off from the evaporator (46). In this state, when the compressor (44, 47) of the hot water supply device (10) is operated, the hot water supply refrigerant circuit (40) performs a dual refrigeration cycle using the hot water supply side heat exchanger (33) as an evaporator. Do. At that time, the expansion valve (45) of the low temperature side circuit (41) is set so that the degree of superheat of the refrigerant at the outlet of the primary side flow path (33a) of the hot water supply side heat exchanger (33) becomes a predetermined target value. The opening is adjusted. Further, the expansion valve (49) of the high temperature side circuit (42) has its refrigerant superheat degree at the outlet of the secondary side flow path (43b) of the cascade heat exchanger (43) so as to reach a predetermined target value. The opening is adjusted. Moreover, the pump (13) of the water circuit (12) is operated, and water circulates between the hot water tank (11) and the heat exchanger (48) for heating.

    The flow of the refrigerant in the hot water supply refrigerant circuit (40) will be described. When the refrigerant discharged from the compressor (44) of the low-temperature circuit (41) passes through the primary flow path (43a) of the cascade heat exchanger (43), the refrigerant flows through the secondary flow path (43b). It dissipates heat to the flowing refrigerant and condenses. The refrigerant flowing out of the cascade heat exchanger (43) is depressurized when passing through the expansion valve (45), and then the primary side of the hot water supply side heat exchanger (33) connected to the hot water supply side connection pipe (50). It flows into the channel (33a). The refrigerant flowing through the primary flow path (33a) of the hot water supply side heat exchanger (33) absorbs heat from the heat medium flowing through the secondary flow path (33b) and evaporates. Thereafter, the refrigerant is sucked into the compressor (44). The compressor (44) compresses the sucked refrigerant and discharges it.

    Further, the refrigerant discharged from the compressor (47) of the high temperature side circuit (42) dissipates heat and condenses when passing through the primary flow path (48a) of the heat exchanger for heating (48). The refrigerant flowing out of the heating heat exchanger (48) is depressurized when passing through the expansion valve (49), and then flows into the secondary flow path (43b) of the cascade heat exchanger (43). The refrigerant flowing through the secondary flow path (43b) of the cascade heat exchanger (43) absorbs heat from the refrigerant flowing through the primary flow path (43a) and evaporates. Thereafter, the refrigerant is sucked into the compressor (47). The compressor (47) compresses the sucked refrigerant and discharges it.

    The flow of water in the water circuit (12) will be described. The low-temperature water present at the bottom of the hot water storage tank (11) is sent to the secondary flow path (48b) of the heating heat exchanger (48) by the pump (13), and the primary flow path (48a) is Heated by flowing refrigerant. And the hot water after a heating is sent back to the top part of a hot water tank (11).

    On the other hand, in the air conditioner (20), the four-way switching valve (23) is in the first state, the first port communicates with the third port, and the second port communicates with the fourth port. The fifth three-way valve (58) is switched to a state in which the third port of the four-way switching valve (23) is communicated with the outdoor heat exchanger (24) and shut off from the first bypass pipe (54). The third three-way valve (56) is switched to a state in which the outdoor expansion valve (25) is communicated with the air conditioning side connection pipe (53) and is shut off from the fourth three-way valve (57). The sixth three-way valve (59) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the third three-way valve (56) and is shut off from the first bypass pipe (54). The eighth three-way valve (61) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the second bypass pipe (55) and is shut off from the fourth three-way valve (57). The seventh three-way valve (60) is switched to a state in which the fourth port of the four-way switching valve (23) communicates with the second bypass pipe (55) and is shut off from each indoor heat exchanger (27).

    When the compressor (22) is operated in the above-described state, in the refrigerant circuit for air conditioning (21), the outdoor heat exchanger (24) becomes a condenser (that is, a radiator), and the air conditioning side heat exchanger (34) The refrigeration cycle that becomes the evaporator is performed. At that time, the degree of opening of the outdoor expansion valve (25) is adjusted so that the degree of superheat of the refrigerant at the outlet of the primary flow path (34a) of the air conditioning side heat exchanger (34) becomes a predetermined target value. The

    The flow of the refrigerant in the air conditioning refrigerant circuit (21) will be described. The refrigerant discharged from the compressor (22) flows into the outdoor heat exchanger (24), and when it passes through the outdoor heat exchanger (24), it dissipates heat to the outdoor air and condenses. The refrigerant flowing out of the outdoor heat exchanger (24) is depressurized when passing through the outdoor expansion valve (25), and then flows into the air conditioning side connection pipe (53). The refrigerant that has flowed into the air conditioning side connection pipe (53) flows into the primary flow path (34a) of the air conditioning side heat exchanger (34) and passes through the secondary flow path while passing through the primary flow path (34a). It absorbs heat from the heat storage medium flowing through the passage (34b) and evaporates. The refrigerant that has passed through the air conditioning side heat exchanger (34) flows through the second bypass pipe (55) and is then sucked into the compressor (22). The compressor (22) compresses the sucked refrigerant and discharges it.

    In addition, in the heat storage device (30), the pump (36) of the heat storage medium circuit (32) is operated, between the heat storage tank (31) and the hot water supply side heat exchanger (33), and between the heat storage tank (31) and the air conditioner. The heat storage medium circulates between the side heat exchangers (34). Specifically, the heat storage medium in the heat storage tank (31) is transferred from the inflow pipe (35a) through the first branch pipe (35b) by the pump (36) to the secondary side stream of the hot water supply side heat exchanger (33). When flowing into the channel (33b) and flowing through the secondary channel (33b), it is cooled by the refrigerant in the hot water supply refrigerant circuit (40) flowing through the primary channel (33a). Further, the heat storage medium in the heat storage tank (31) is transferred from the inflow pipe (35a) to the secondary side flow path (34b) of the air conditioning side heat exchanger (34) through the second branch pipe (35c) by the pump (36). ) And is cooled by the refrigerant of the air conditioning refrigerant circuit (21) flowing through the primary channel (34a) when flowing through the secondary channel (34b). The heat storage medium flowing out from the secondary flow path (33b, 34b) of the hot water supply side heat exchanger (33) and the air conditioning side heat exchanger (34) is sent back to the heat storage tank (31). And the cold energy provided to the heat storage medium in the hot water supply side heat exchanger (33) and the air conditioning side heat exchanger (34) is stored in the heat storage tank (31) as latent heat.

    As described above, during the cold storage operation, the hot water supply device (10) performs the refrigeration cycle in the hot water supply refrigerant circuit (40) to heat the water in the hot water storage tank (11), while being obtained by the refrigeration cycle. The hot water storage side cold storage operation in which the heat storage device (30) cools the heat storage medium in the heat storage tank (31) with cold heat, and the air conditioner (20) performs a refrigeration cycle in the refrigerant circuit (21) for air conditioning. The air storage side cold storage operation in which the heat storage device (30) cools the heat storage medium in the heat storage tank (31) is performed simultaneously with the obtained cold energy. If almost all of the water in the hot water tank (11) becomes hot water of about 80 to 90 ° C. or the amount of hot water in the hot water tank (11) reaches the amount that can meet the hot water demand on the next day, The air conditioning system (1) stops the hot water supply side heat storage operation and performs only the air conditioning side heat storage operation.

<First use cooling operation>
The first use cooling operation will be described with reference to FIG. In the first use cooling operation, indoor cooling is performed using only the cold energy stored in the heat storage tank (31). In the first use cooling operation, the pump (36) of the heat storage medium circuit (32) operates, and the heat storage medium circulates between the heat storage tank (31) and the air conditioning side heat exchanger (34). In the first use cooling operation, the hot water supply device (10) is stopped.

    In the air conditioner (20), the four-way switching valve (23) is in the first state, the first port communicates with the third port, and the second port communicates with the fourth port. The fifth three-way valve (58) is switched to a state in which the third port of the four-way switching valve (23) is communicated with the first bypass pipe (54) and shut off from the outdoor heat exchanger (24). The sixth three-way valve (59) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the first bypass pipe (54) and is shut off from the third three-way valve (56). The eighth three-way valve (61) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the fourth three-way valve (57) and is shut off from the second bypass pipe (55). The fourth three-way valve (57) is switched to a state in which each outdoor expansion valve (26) communicates with the air conditioning side connection pipe (53) and is shut off from the third three-way valve (56). The seventh three-way valve (60) is switched to a state in which the fourth port of the four-way switching valve (23) communicates with each indoor heat exchanger (27) and is shut off from the second bypass pipe (55).

    In the above-described state, when each indoor expansion valve (26) is kept fully open and the compressor (22) of the air conditioner (20) is operated as a gas pump, the air conditioning refrigerant circuit (21) The refrigerant circulates between the exchanger (34) and each indoor heat exchanger (27).

    The flow of the refrigerant in the air conditioning refrigerant circuit (21) will be described. The refrigerant discharged from the compressor (22) flows through the first bypass pipe (54) and then flows into the primary flow path (34a) of the air conditioning side heat exchanger (34). The refrigerant flowing into the primary flow path (34a) of the air conditioning side heat exchanger (34) dissipates heat to the heat storage medium flowing through the secondary flow path (34b) and condenses. The refrigerant flowing out of the air conditioning side heat exchanger (34) passes through each indoor expansion valve (26) and flows into each indoor heat exchanger (27), and from each room heat exchanger (27), from the indoor air It absorbs heat and evaporates. The indoor air cooled in each indoor heat exchanger (27) is supplied indoors. The refrigerant that has passed through each indoor heat exchanger (27) is sucked into the compressor (22). The compressor (22) operating as a gas pump boosts the suctioned refrigerant and discharges it.

    On the other hand, in the heat storage device (30), the first adjustment valve (37) is held in a fully closed state, while the opening of the second adjustment valve (38) is adjusted as appropriate. In this state, when the pump (36) of the heat storage medium circuit (32) is operated, the heat storage medium circulates between the heat storage tank (31) and the air conditioning side heat exchanger (34). The heat storage medium in the heat storage tank (31) is sent to the secondary flow path (34b) of the air conditioning side heat exchanger (34) by the pump (36), and absorbs heat from the refrigerant flowing through the primary flow path (34a). To do. That is, in the air conditioning side heat exchanger (34), cold heat is applied from the heat storage medium in the secondary side flow path (34b) to the refrigerant in the primary side flow path (34a). The heat storage medium that has passed through the secondary flow path (34b) of the air conditioning side heat exchanger (34) is sent back to the heat storage tank (31).

<Second use cooling operation>
The second usage cooling operation will be described with reference to FIG. In the second use cooling operation, the room is cooled using the cold heat stored in the heat storage tank (31) and the cold heat obtained by the refrigeration cycle performed by the air conditioning refrigerant circuit (21). In the second utilization cooling operation, the pump (36) of the heat storage medium circuit (32) is operated, and the heat storage medium circulates between the heat storage tank (31) and the air conditioning side heat exchanger (34). In the second usage cooling operation, the hot water supply device (10) is stopped.

    In the air conditioner (20), the four-way switching valve (23) is in the first state, the first port communicates with the third port, and the second port communicates with the fourth port. The fifth three-way valve (58) is switched to a state in which the third port of the four-way switching valve (23) is communicated with the outdoor heat exchanger (24) and shut off from the first bypass pipe (54). The third three-way valve (56) is switched to a state in which the outdoor expansion valve (25) is communicated with the air conditioning side connection pipe (53) and is shut off from the fourth three-way valve (57). The sixth three-way valve (59) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the third three-way valve (56) and is shut off from the first bypass pipe (54). The eighth three-way valve (61) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the fourth three-way valve (57) and is shut off from the second bypass pipe (55). The fourth three-way valve (57) is switched to a state in which each indoor expansion valve (26) communicates with the air conditioning side connection pipe (53) and is shut off from the third three-way valve (56). The seventh three-way valve (60) is switched to a state in which the fourth port of the four-way switching valve (23) communicates with each indoor heat exchanger (27) and is shut off from the second bypass pipe (55).

    In the above-described state, when the compressor (22) is operated while the outdoor expansion valve (25) is kept fully open, the air conditioning refrigerant circuit (21) is converted into the outdoor heat exchanger (24) into the condenser (that is, The air conditioning side heat exchanger (34) becomes a supercooler (that is, a radiator), and each indoor heat exchanger (27) becomes an evaporator. At that time, the opening degree of each indoor expansion valve (26) is adjusted so that the degree of superheat of the refrigerant at the outlet of each indoor heat exchanger (27) becomes a predetermined target value.

    The flow of the refrigerant in the air conditioning refrigerant circuit (21) will be described. The refrigerant discharged from the compressor (22) flows into the outdoor heat exchanger (24), and when it passes through the outdoor heat exchanger (24), it dissipates heat to the outdoor air and condenses. The refrigerant that has flowed out of the outdoor heat exchanger (24) passes through the outdoor expansion valve (25) and flows into the air conditioning side connection pipe (53). The refrigerant that has flowed into the air conditioning side connection pipe (53) flows into the primary flow path (34a) of the air conditioning side heat exchanger (34) and passes through the secondary flow path while passing through the primary flow path (34a). It is cooled by the heat storage medium flowing through the passage (34b). The refrigerant that has passed through the air conditioning side heat exchanger (34) flows into each indoor expansion valve (26) and is decompressed when passing through each indoor expansion valve (26). The refrigerant decompressed by each indoor expansion valve (26) flows into each indoor heat exchanger (27), absorbs heat from the indoor air, and evaporates. The indoor air cooled in each indoor heat exchanger (27) is supplied indoors. The refrigerant that has passed through each indoor heat exchanger (27) is sucked into the compressor (22). The compressor (22) compresses the sucked refrigerant and discharges it.

    On the other hand, in the heat storage device (30), the first adjustment valve (37) is held in a fully closed state, while the opening of the second adjustment valve (38) is adjusted as appropriate. In this state, when the pump (36) of the heat storage medium circuit (32) is operated, the heat storage medium circulates between the heat storage tank (31) and the air conditioning side heat exchanger (34). The heat storage medium in the heat storage tank (31) is sent to the secondary flow path (34b) of the air conditioning side heat exchanger (34) by the pump (36), and absorbs heat from the refrigerant flowing through the primary flow path (34a). To do. That is, in the air conditioning side heat exchanger (34), cold heat is applied from the heat storage medium in the secondary side flow path (34b) to the refrigerant in the primary side flow path (34a). The heat storage medium that has passed through the secondary flow path (34b) of the air conditioning side heat exchanger (34) is sent back to the heat storage tank (31).

<Simple cooling operation>
The simple cooling operation will be described with reference to FIG. In the simple cooling operation, the room is cooled using only the cooling heat obtained by the refrigeration cycle performed by the air conditioning refrigerant circuit (21). In the simple cooling operation, the hot water supply device (10) and the heat storage device (30) are stopped.

    In the air conditioner (20), the four-way switching valve (23) is in the first state, the first port communicates with the third port, and the second port communicates with the fourth port. The fifth three-way valve (58) is switched to a state in which the third port of the four-way switching valve (23) is communicated with the outdoor heat exchanger (24) and shut off from the first bypass pipe (54). The fifth three-way valve (58) is switched to a state in which the third port of the four-way switching valve (23) communicates with the outdoor heat exchanger (24) and is shut off from the first bypass pipe (54). The third three-way valve (56) is switched to a state where the outdoor expansion valve (25) communicates with the fourth three-way valve (57) and is shut off from the air conditioning side connection pipe (53). The fourth three-way valve (57) is switched to a state in which each indoor expansion valve (26) communicates with the third three-way valve (56) and is shut off from the air conditioning side connection pipe (53). The seventh three-way valve (60) is switched to a state in which the fourth port of the four-way switching valve (23) communicates with each indoor heat exchanger (27) and is shut off from the second bypass pipe (55).

    When the compressor (22) is operated in the above-described state, in the refrigerant circuit (21) for air conditioning, the outdoor heat exchanger (24) becomes a condenser (that is, a radiator), and each indoor heat exchanger (27) The refrigeration cycle that becomes an evaporator is performed. At that time, the outdoor expansion valve (25) is held in a fully open state, and each indoor expansion valve (26) is set so that the degree of superheat of the refrigerant at the outlet of each indoor heat exchanger (27) becomes a predetermined target value. The opening degree is adjusted.

    The flow of the refrigerant in the air conditioning refrigerant circuit (21) will be described. The refrigerant discharged from the compressor (22) flows into the outdoor heat exchanger (24), dissipates heat to the outdoor air and condenses while passing through the outdoor heat exchanger (24). The refrigerant that has passed through the outdoor heat exchanger (24) passes through the outdoor expansion valve (25), and then flows into each indoor expansion valve (26) to be depressurized. The refrigerant decompressed by each indoor expansion valve (26) flows into each indoor heat exchanger (27), absorbs heat from the indoor air, and evaporates. The indoor air cooled in each indoor heat exchanger (27) is supplied indoors. The refrigerant that has passed through each indoor heat exchanger (27) is sucked into the compressor (22). The compressor (22) compresses the sucked refrigerant and discharges it.

<Heat storage operation>
The heat storage operation will be described with reference to FIG. In the heat storage operation, heat is obtained by the refrigeration cycle performed by the air conditioning refrigerant circuit (21), and the obtained heat is stored in the heat storage tank (31). In the heat storage operation, the pump (36) of the heat storage medium circuit (32) operates, and the heat storage medium circulates between the heat storage tank (31) and the air conditioning side heat exchanger (34). In the heat storage operation, the hot water supply device (10) is stopped.

    In the air conditioner (20), the four-way switching valve (23) is in the second state, the first port communicates with the fourth port, and the second port communicates with the third port. The seventh three-way valve (60) is switched to a state in which the fourth port of the four-way switching valve (23) is communicated with the second bypass pipe (55) and shut off from each indoor heat exchanger (27). The eighth three-way valve (61) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the second bypass pipe (55) and is shut off from the fourth three-way valve (57). The sixth three-way valve (59) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the third three-way valve (56) and is shut off from the first bypass pipe (54). The third three-way valve (56) is switched to a state in which the outdoor expansion valve (25) is communicated with the air conditioning side connection pipe (53) and is shut off from the fourth three-way valve (57). The fifth three-way valve (58) is switched to a state in which the third port of the four-way switching valve (23) communicates with the outdoor heat exchanger (24) and is shut off from the first bypass pipe (54).

    When the compressor (22) is operated in the above-described state, the air conditioning side heat exchanger (34) becomes a condenser (ie, a radiator) in the air conditioning refrigerant circuit (21), and the outdoor heat exchanger (24) The refrigeration cycle that becomes an evaporator is performed. At that time, the opening of the outdoor expansion valve (25) is adjusted so that the degree of superheat of the refrigerant at the outlet of the outdoor heat exchanger (24) becomes a predetermined target value.

    The flow of the refrigerant in the air conditioning refrigerant circuit (21) will be described. The refrigerant discharged from the compressor (22) flows into the second bypass pipe (55). The refrigerant flowing into the second bypass pipe (55) flows into the primary flow path (34a) of the air conditioning side heat exchanger (34) and passes through the secondary side flow (34a) while passing through the primary flow path (34a). It dissipates heat to the heat storage medium flowing through the path (34b) and condenses. The refrigerant that has passed through the air conditioning side heat exchanger (34) flows into the outdoor expansion valve (25) and is decompressed when it passes through the outdoor expansion valve (25). The refrigerant decompressed in the outdoor expansion valve (25) flows into the outdoor heat exchanger (24), absorbs heat from the outdoor air, and evaporates. The refrigerant that has passed through the outdoor heat exchanger (24) is sucked into the compressor (22). The compressor (22) compresses the sucked refrigerant and discharges it.

    In the heat storage device (30), the first adjustment valve (37) is held in a fully closed state, while the opening of the second adjustment valve (38) is adjusted as appropriate. In this state, when the pump (36) of the heat storage medium circuit (32) is operated, the heat storage medium circulates between the heat storage tank (31) and the air conditioning side heat exchanger (34). The heat storage medium in the heat storage tank (31) is sent by the pump (36) to the secondary side flow path (34b) of the air conditioning side heat exchanger (34) and heated by the refrigerant flowing through the primary side flow path (34a). Is done. The heat storage medium heated in the air conditioning side heat exchanger (34) is sent back to the heat storage tank (31). Accordingly, the heat storage tank (31) stores the heat of the refrigerant discharged from the compressor (22).

<Use heating operation>
The utilization heating operation will be described with reference to FIG. In the use heating operation, the room is heated using the heat stored in the heat storage tank (31). In the utilization heating operation, the pump (36) of the heat storage medium circuit (32) operates, and the heat storage medium circulates between the heat storage tank (31) and the air conditioning side heat exchanger (34). In the use heating operation, the hot water supply device (10) is stopped.

    In the air conditioner (20), the four-way switching valve (23) is in the second state, the first port communicates with the fourth port, and the second port communicates with the third port. The seventh three-way valve (60) is switched to a state in which the fourth port of the four-way switching valve (23) is communicated with each indoor heat exchanger (27) and shut off from the second bypass pipe (55). The fourth three-way valve (57) is switched to a state in which each indoor expansion valve (26) communicates with the air conditioning side connection pipe (53) and is shut off from the third three-way valve (56). The eighth three-way valve (61) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the fourth three-way valve (57) and is shut off from the second bypass pipe (55). The sixth three-way valve (59) is switched to a state where the air-conditioning side heat exchanger (34) communicates with the first bypass pipe (54) and is shut off from the third three-way valve (56). The fifth three-way valve (58) is switched to a state in which the third port of the four-way switching valve (23) communicates with the first bypass pipe (54) and is shut off from the outdoor heat exchanger (24).

    When the compressor (22) is operated in the above-described state, in the refrigerant circuit for air conditioning (21), each indoor heat exchanger (27) becomes a condenser (ie, a radiator), and the air conditioning side heat exchanger (34) The refrigeration cycle that becomes an evaporator is performed. At that time, the opening degree of each indoor expansion valve (26) is adjusted so that the degree of superheat of the refrigerant at the outlet of the primary side flow path (34a) of the air conditioning side heat exchanger (34) becomes a predetermined target value. Is done.

    The flow of the refrigerant in the air conditioning refrigerant circuit (21) will be described. The refrigerant discharged from the compressor (22) flows into each indoor heat exchanger (27), dissipates heat to the indoor air and condenses while passing through each indoor heat exchanger (27). The indoor air heated in each indoor heat exchanger (27) is supplied indoors. The refrigerant that has passed through each indoor heat exchanger (27) is depressurized when passing through each indoor expansion valve (26), and then flows into the air-conditioning side connection pipe (53). Thereafter, the refrigerant flows into the primary flow path (34a) of the air conditioning side heat exchanger (34), absorbs heat from the heat storage medium flowing through the secondary flow path (34b), and evaporates. The refrigerant that has flowed out of the air conditioning side heat exchanger (34) flows into the first bypass pipe (54), and is then sucked into the compressor (22). The compressor (22) compresses the sucked refrigerant and discharges it.

    On the other hand, in the heat storage device (30), the first adjustment valve (37) is held in a fully closed state, while the opening of the second adjustment valve (38) is adjusted as appropriate. In this state, when the pump (36) of the heat storage medium circuit (32) is operated, the heat storage medium circulates between the heat storage tank (31) and the air conditioning side heat exchanger (34). The heat storage medium in the heat storage tank (31) is sent by the pump (36) to the secondary side flow path (34b) of the air conditioning side heat exchanger (34) and dissipated to the refrigerant flowing through the primary side flow path (34a). To do. The heat storage medium that has passed through the secondary flow path (34b) of the air conditioning side heat exchanger (34) is sent back to the heat storage tank (31).

<Simple heating operation>
The simple heating operation will be described with reference to FIG. In the simple heating operation, the room is heated using only the heat obtained by the refrigeration cycle performed by the air conditioning refrigerant circuit (21). In the simple heating operation, the hot water supply device (10) and the heat storage device (30) are stopped.

    In the air conditioner (20), the four-way switching valve (23) is in the second state, the first port communicates with the fourth port, and the second port communicates with the third port. The seventh three-way valve (60) is switched to a state in which the fourth port of the four-way switching valve (23) is communicated with each indoor heat exchanger (27) and shut off from the second bypass pipe (55). The fourth three-way valve (57) is switched to a state in which each indoor expansion valve (26) communicates with the third three-way valve (56) and is shut off from the air conditioning side connection pipe (53). The third three-way valve (56) is switched to a state where the outdoor expansion valve (25) communicates with the fourth three-way valve (57) and is shut off from the air conditioning side connection pipe (53). The fifth three-way valve (58) is switched to a state in which the third port of the four-way switching valve (23) communicates with the outdoor heat exchanger (24) and is shut off from the first bypass pipe (54).

    When the compressor (22) is operated in the above-described state, in the refrigerant circuit (21) for air conditioning, each indoor heat exchanger (27) becomes a condenser (that is, a radiator), and the outdoor heat exchanger (24) A refrigeration cycle that serves as an evaporator is performed. At that time, each indoor expansion valve (26) is held in a fully open state, while the outdoor expansion valve (25) is such that the degree of superheat of the refrigerant at the outlet of the heating side heat exchanger becomes a predetermined target value. The opening is adjusted.

    The flow of the refrigerant in the air conditioning refrigerant circuit (21) will be described. The refrigerant discharged from the compressor (22) flows into each indoor heat exchanger (27), dissipates heat to the indoor air and condenses while passing through each indoor heat exchanger (27). The indoor air heated in each indoor heat exchanger (27) is supplied indoors. The refrigerant that has passed through each indoor heat exchanger (27) flows into each outdoor expansion valve (25) after passing through each indoor expansion valve (26), and is reduced in pressure when passing through the outdoor expansion valve (25). The refrigerant decompressed in the outdoor expansion valve (25) flows into the outdoor heat exchanger (24), absorbs heat from the outdoor air, and evaporates. The refrigerant that has passed through the outdoor heat exchanger (24) is sucked into the compressor (22). The compressor (22) compresses the sucked refrigerant and discharges it.

<Simple water heater operation>
The simple water heater operation will be described with reference to FIG. In the simple hot water heating operation, the water in the hot water storage tank (11) is heated using only the heat obtained by the refrigeration cycle performed by the hot water supply refrigerant circuit (40). In the simple water heater operation, the air conditioner (20) and the heat storage device (30) are stopped.

    In the hot water supply device (10), the first and second three-way valves (51, 52) are switched so that the refrigerant does not flow to the hot water supply side heat exchanger (33) of the heat storage device (30) in the low temperature side circuit (41). It is done. That is, the first three-way valve (51) is switched to a state in which the expansion valve (45) of the low-temperature side circuit (41) is communicated with the evaporator (46) and cut off from the hot water supply side connection pipe (50). The three-way valve (52) is switched to a state in which the compressor (44) of the low temperature side circuit (41) is communicated with the evaporator (46) and cut off from the hot water supply side connection pipe (50). In this state, when the compressors (44, 47) of the hot water supply device (10) are operated, the hot water supply refrigerant circuit (40) performs a dual refrigeration cycle. At that time, the opening degree of the expansion valve (45) of the low temperature side circuit (41) is adjusted so that the degree of superheat of the refrigerant at the outlet of the evaporator (46) becomes a predetermined target value. Further, the expansion valve (49) of the high temperature side circuit (42) has its refrigerant superheat degree at the outlet of the secondary side flow path (43b) of the cascade heat exchanger (43) so as to reach a predetermined target value. The opening is adjusted. Moreover, the pump (13) of the water circuit (12) is operated, and water circulates between the hot water tank (11) and the heat exchanger (48) for heating.

    The flow of the refrigerant in the hot water supply refrigerant circuit (40) will be described. When the refrigerant discharged from the compressor (44) of the low-temperature circuit (41) passes through the primary flow path (43a) of the cascade heat exchanger (43), the refrigerant flows through the secondary flow path (43b). It dissipates heat to the flowing refrigerant and condenses. The refrigerant flowing out of the cascade heat exchanger (43) is depressurized when passing through the expansion valve (45), and then flows into the evaporator (46) to absorb heat from the outdoor air and evaporate. Thereafter, the refrigerant is sucked into the compressor (44). The compressor (44) compresses the sucked refrigerant and discharges it.

    Further, the refrigerant discharged from the compressor (47) of the high temperature side circuit (42) dissipates heat and condenses when passing through the primary flow path (48a) of the heat exchanger for heating (48). The refrigerant flowing out of the heating heat exchanger (48) is depressurized when passing through the expansion valve (49), and then flows into the secondary flow path (43b) of the cascade heat exchanger (43). The refrigerant flowing through the secondary flow path (43b) of the cascade heat exchanger (43) absorbs heat from the refrigerant flowing through the primary flow path (43a) and evaporates. Thereafter, the refrigerant is sucked into the compressor (47). The compressor (47) compresses the sucked refrigerant and discharges it.

    The flow of water in the water circuit (12) will be described. The low-temperature water present at the bottom of the hot water storage tank (11) is sent to the secondary flow path (48b) of the heating heat exchanger (48) by the pump (13), and the primary flow path (48a) is Heated by flowing refrigerant. And the hot water after a heating is sent back to the top part of a hot water tank (11).

<Driving operation in the cooling season>
In a cooling season such as summer, the hot water supply air conditioning system (1) performs a cold storage operation, a first use cooling operation, a second use cooling operation, and a simple cooling operation.

    Cold storage operation is performed at midnight when the electricity bill is cheap. On the other hand, the first use cooling operation, the second use cooling operation, and the simple cooling operation are mainly performed from daytime to evening.

    In the midnight of the cooling season, the hot water supply air conditioning system (1) always performs cold storage operation. As described above, in the hot water supply air conditioning system (1) during the cold storage operation, the hot water supply device (10) performs the refrigeration cycle in the hot water supply refrigerant circuit (40) to heat the water in the hot water storage tank (11), while the refrigeration The heat storage device (30) cools the heat storage medium in the heat storage tank (31) with the cold energy obtained by the cycle, and the air conditioner (20) performs a refrigeration cycle in the air conditioning refrigerant circuit (21) The air storage side heat storage operation in which the heat storage device (30) cools the heat storage medium in the heat storage tank (31) with the cold energy obtained by the refrigeration cycle is performed. In the cold storage operation, almost all of the water in the hot water storage tank (11) becomes hot water of about 80 to 90 ° C., or the amount of high temperature water in the hot water storage tank (11) is sufficient to meet the demand for hot water supply on the next day. When it reaches, the hot water supply air conditioning system (1) stops the hot water supply side heat storage operation and performs only the air conditioning side heat storage operation.

    By the way, in the summer when the demand for hot water supply is relatively small and the cooling load is high, there are many cases where the cooling load during the day cannot be processed with only the cold heat stored in the heat storage device (30) by the hot water storage side heat storage operation. However, in the cold storage operation, the hot water supply air conditioning system (1) stores not only the hot water supply side heat storage operation but also the cold storage in the heat storage device (30) by performing the air conditioning side heat storage operation. As described above, in the air conditioning side heat storage operation, the refrigerant in the air conditioning refrigerant circuit (21) releases the heat absorbed from the heat storage medium to the outdoor air, so the amount of hot water in the hot water storage tank (11) is Regardless of this, cold heat can be stored in the heat storage device (30). Therefore, the hot water supply air-conditioning system (1) of the present embodiment sufficiently secures the amount of cold heat stored in the heat storage device (30) by performing a cold storage operation in which the hot water supply side heat storage operation and the air conditioning side heat storage operation are performed at midnight. doing.

    The first usage cooling operation and the second usage cooling operation are operations for cooling the room using the cold energy stored in the heat storage device (30) by the cold storage operation. The power consumption of the hot water supply air-conditioning system (1) in the first use cooling operation and the second use cooling operation is the simple cooling operation in which the cooling is performed using only the cooling heat obtained by the refrigeration cycle performed by the air conditioning refrigerant circuit (21). It is less than the power consumption of the hot water supply air conditioning system (1). For this reason, the power consumption of the hot water supply air conditioning system (1) from the daytime to the evening when the power rate is high is reduced, and the running cost of the hot water supply air conditioning system (1) is reduced.

    Even after the cold energy stored in the heat storage device (30) has been used up, there are cases where indoor cooling is required. In such a case, the hot water supply air conditioning system (1) performs simple cooling operation.

<Operation during heating season>
In a heating season such as winter, the hot water supply air conditioning system (1) performs a heat storage operation, a utilization heating operation, a simple heating operation, and a simple water heater operation.

    As described above, in the hot water supply air conditioning system (1) during the heat storage operation, heat is stored in the heat storage device (30). The hot water supply air-conditioning system (1) during use heating operation performs the above-described operation using the heat stored in the heat storage device (30) during the heat storage operation.

    In addition, even after exhausting the heat stored in the heat storage device (30), indoor heating may be required. In such a case, the hot water supply air conditioning system (1) performs simple heating operation. In some cases, only heating is required without heating. In such a case, the hot water supply air conditioning system (1) performs a simple water heating operation.

-Effect of Embodiment 1-
In the hot water supply air conditioning system (1) of the present embodiment, the hot water supply side cold storage operation and the air conditioning side cold storage operation can be performed during the cold storage operation. During the hot water supply side cold storage operation, a refrigeration cycle is performed in the hot water supply refrigerant circuit (40), and the hot water supply device (10) generates hot water using the heat released from the refrigerant in the heating heat exchanger (48). And the cold energy obtained in the hot water supply side heat exchanger (33) is stored in the heat storage tank (31) of the heat storage device (30). On the other hand, during the cold storage operation on the air conditioning side, a refrigeration cycle is performed in the refrigerant circuit for air conditioning (21), and the refrigerant radiates heat to the outdoor air in the outdoor heat exchanger (24), and is obtained in the air conditioning side heat exchanger (34). The generated cold energy is stored in the heat storage tank (31) of the heat storage device (30).

    Thus, according to the hot water supply air conditioning system (1) of this embodiment, not only the hot water supply side cold storage operation but also the air conditioning side cold storage operation is performed, so that a larger amount of cold heat is stored than in the case of performing only the hot water supply side cold storage operation. It can be stored in the heat storage tank (31) of (30). Therefore, not only the cold energy that is obtained when hot water is generated, but also the cold energy that is obtained when the refrigerant in the air conditioning refrigerant circuit (21) radiates heat to the outdoor air is stored in the heat storage tank (31) of the heat storage device (30). Can do. Therefore, according to the hot water supply air-conditioning system (1) of the present embodiment, the cold storage operation is performed at midnight when the electricity rate is low, and the hot water supply side cold storage operation and the air conditioning side cold storage operation are performed during the cold storage operation. A sufficient amount of cold energy required for cooling operation can be stored in the heat storage tank (31). As a result, the amount of power consumed to cool the room during the day can be sufficiently reduced, and the running cost of the hot water supply air conditioning system can be sufficiently reduced.

    Moreover, according to the hot water supply air conditioning system (1) of the present embodiment, the first circulation path (35a, 35b) for circulating the heat storage medium between the hot water supply side heat exchanger (33) and the heat storage tank (31), By providing the second circulation path (35a, 35c) for circulating the heat storage medium between the air conditioning side heat exchanger (34) and the heat storage tank (31), the hot water supply side cold storage operation and the air conditioning side cold storage operation can be performed simultaneously. Thus, the cold heat obtained by the refrigeration cycle in the hot water supply refrigerant circuit and the cold heat obtained by the refrigeration cycle in the air conditioning refrigerant circuit can be stored in the same heat storage tank (31). Therefore, the hot water supply air conditioning system (1) can be configured in a compact manner.

Further, according to the hot water supply air conditioning system (1) of the present embodiment, the hot water supply side heat storage operation and the air conditioning side heat storage operation are performed simultaneously in parallel, so the air conditioning side heat storage operation is performed after the hot water supply side heat storage operation is completed. Compared to the case, the time required for the cold storage operation can be shortened.

<< Embodiment 2 of the Invention >>
The hot water supply air conditioning system (1) of Embodiment 2 is obtained by changing the configurations of the air conditioner (20) and the heat storage device (30) in the hot water supply air conditioning system (1) of Embodiment 1. The hot water supply device (10) is configured in the same manner as in the first embodiment. Hereinafter, a description will be given with reference to FIG.

<Air conditioning device>
In Embodiment 2, the air conditioner (20) includes first to third air conditioning units (20A, 20B, 20C). Each air conditioning unit (20A, 20B, 20C) includes an air conditioning refrigerant circuit (21) that is a closed circuit filled with a refrigerant, an outdoor fan (24a), and an indoor fan (27a).

    In the first embodiment, the air conditioning refrigerant circuit (21) is connected to the fourth three-way valve (57) side of the air-conditioning side heat exchanger (34) in the air-conditioning side connection pipe (53). ) Is connected between the third three-way valve (56) and the fourth three-way valve (57) of the main circuit (29), and the air conditioning side heat exchanger (34) is connected to the air conditioning side connection pipe (53). ), But the heat transfer tube (39) is connected in the same manner as in the first embodiment. In the second embodiment, the eighth three-way valve (61) includes a state in which the fourth three-way valve (57) communicates with the third three-way valve (56) and the second bypass pipe (55) is shut off, and the fourth three-way valve ( 57) is connected to the second bypass pipe (55) to switch to a state in which the third three-way valve (56) is shut off.

<Heat storage device>
In Embodiment 2, the heat storage device (30) includes the first to fourth connection pipes (81) connecting the first to third heat storage units (30A, 30B, 30C) and the heat storage units (30A, 30B, 30C). To 84) and first to eighth flow path switching valves (71 to 78).

    Each heat storage unit (30A, 30B, 30C) includes a heat storage tank (31) and a heat transfer tube (39). The heat transfer tube (39) is arranged in the heat storage tank (31), and meanders up and down while being immersed in the heat storage medium. Moreover, in Embodiment 2, water is stored as a heat storage medium in the heat storage tank (31). Although details will be described later, the heat storage device (30) stores cold energy by freezing water stored as a heat storage medium in the heat storage tank (31), and stores water stored as a heat storage medium in the heat storage tank (31). Heat is stored by generating warm water by heating.

    A 1st flow-path switching valve (71) and a 2nd flow-path switching valve (72) are comprised by the three-way valve, the middle part of the hot-water supply side connection piping (50), and the air-conditioning side connection piping of a 1st air conditioning unit (20A) (53) Connected to the middle part respectively. In the hot water supply side connection pipe (50), the first flow path switching valve (71) is connected to the second three-way valve (52) side, and the second flow path switching valve (72) is connected to the first three-way valve (51) side. It is connected. On the other hand, in the air conditioning side connection pipe (53) of the first air conditioning unit (20A), the first flow path switching valve (71) is connected to the third three-way valve (56) side, and the second flow path switching valve (72). Is connected to the fourth three-way valve (57) side. One end of the heat transfer pipe (39) of the first heat storage unit (30A) is connected to the first flow path switching valve (71), and the first heat storage unit (30A) is connected to the second flow path switching valve (72). The other end of the heat transfer tube (39) is connected.

    The third flow path switching valve (73) is constituted by a three-way valve, and the first flow path switching valve (71) and the sixth three-way valve (59) of the air conditioning side connection pipe (53) of the first air conditioning unit (20A). Connected between and. The fourth flow path switching valve (74) is constituted by a three-way valve, and the second flow path switching valve (72) and the fourth three-way valve (57) of the air conditioning side connection pipe (53) of the first air conditioning unit (20A). Connected between and.

    The fifth flow path switching valve (75) and the sixth flow path switching valve (76) are constituted by four-way valves, and are respectively connected to midway portions of the air conditioning side connection pipe (53) of the second air conditioning unit (20B). Yes. In the air conditioning side connection pipe (53) of the second air conditioning unit (20B), the fifth channel switching valve (75) is connected to the third three-way valve (56) side, and the sixth channel switching valve (76) is the second one. 4 Connected to the three-way valve (57) side. One end of the heat transfer tube (39) of the second heat storage unit (30B) is connected to the fifth flow path switching valve (75), and the second heat storage unit (30B) is connected to the sixth flow path switching valve (76). The other end of the heat transfer tube (39) is connected.

    The seventh flow path switching valve (77) and the eighth flow path switching valve (78) are constituted by three-way valves and are respectively connected to midway portions of the air conditioning side connection pipe (53) of the third air conditioning unit (20C). Yes. In the air conditioning side connection pipe (53) of the third air conditioning unit (20C), the seventh flow path switching valve (77) is connected to the third three-way valve (56) side, and the eighth flow path switching valve (78) is 4 Connected to the three-way valve (57) side. One end of the heat transfer tube (39) of the third heat storage unit (30C) is connected to the seventh flow path switching valve (77), and the third heat storage unit (30C) is connected to the eighth flow path switching valve (78). The other end of the heat transfer tube (39) is connected.

    The first connection pipe (81) is connected to the third flow path switching valve (73) and the fifth flow path switching valve (75). The second connection pipe (82) is connected to the fifth flow path switching valve (75) and the seventh flow path switching valve (77). The third connection pipe (83) is connected to the fourth flow path switching valve (74) and the sixth flow path switching valve (76). The fourth connection pipe (84) is connected to the sixth flow path switching valve (76) and the eighth flow path switching valve (78).

    With such a configuration, each heat transfer tube (39) is switched between the hot water supply refrigerant circuit (40) and each air conditioning refrigerant circuit (21) by switching the first to eighth flow path switching valves (71 to 78). It will be selectively connected. That is, in Embodiment 2, the heat transfer tube (39) provided in the heat storage tank (31) serves as both the hot water supply side heat exchanger and the air conditioning side heat exchanger according to the present invention.

-Driving action-
The operation of the hot water supply air conditioning system (1) will be described. The hot water supply air conditioning system (1) includes a cold storage operation, a first use cooling operation, a second use cooling operation, a simple cooling operation, a heat storage operation, a use heating operation, a simple heating operation, and a simple water heating operation. Do. The simple cooling operation, the simple heating operation, and the simple water heater operation are the same as those in the first embodiment. Therefore, in the following, the cold storage operation, the first use cooling operation, the second use cooling operation, the heat storage operation, and the use The heating operation will be described.

<Cool storage operation>
The cold storage operation will be described with reference to FIG. In the cold storage operation, the hot water supply air conditioning system (1) performs a hot water supply side heat storage operation and an air conditioning side heat storage operation. In the hot water supply side heat storage operation, the hot water supply device (10) performs the refrigeration cycle in the hot water supply refrigerant circuit (40) to heat the water in the hot water storage tank (11), while the cold heat obtained by the refrigeration cycle uses the first heat storage unit. The heat storage medium in the (30A) heat storage tank (31) is cooled. On the other hand, in the air conditioning side heat storage operation, the air conditioner (20) performs a refrigeration cycle in the air conditioning refrigerant circuit (21) of the second and third air conditioning units (20B, 20C), and the cold heat obtained by the refrigeration cycle is used. The heat storage medium in the heat storage tank (31) of the second and third heat storage units (30B, 30C) is cooled. The heat storage device (30) combines the cold energy obtained by the hot water supply side heat storage operation of the hot water supply device (10) and the cold heat obtained by the air conditioning side heat storage operation of the air conditioner (20) by the first to third heat storage units ( Store in heat storage tank (31) of 30A-30C). In this cold storage operation, the first air conditioning unit (20A) is stopped.

    Since the operation of the hot water supply device (10) in the hot water supply side heat storage operation is substantially the same as that of the first embodiment except that the hot water supply side heat exchanger (33) is replaced with the heat transfer tube (39), the description thereof is omitted.

    In the air conditioner (20), the first air conditioning unit (20A) stops, while the second and third air conditioning units (20B, 20C) perform the air conditioning side heat storage operation. In the second and third air conditioning units (20B, 20C), the air conditioning side heat storage operation is performed by replacing the air conditioning side heat exchanger (34) with the heat transfer tube (39) so that the refrigerant flowing through the heat transfer tube (39) is stored in the heat storage tank (39). 31) absorbing heat from the heat storage medium, the fourth three-way valve (57) is switched to a state in which the eighth three-way valve (61) communicates with the air conditioning side connection pipe (53) and is shut off from the indoor expansion valve (26). And the eighth three-way valve (61) is switched to a state in which the second bypass pipe (55) is communicated with the fourth three-way valve (57) and shut off from the third three-way valve (56). The description is omitted because it is almost the same.

    In the heat storage device (30), the first flow path switching valve (71) and the second flow path switching valve (72) respectively connect the heat transfer pipe (39) of the first heat storage unit (30A) to the hot water supply side connection pipe (50). And is disconnected from the air conditioning side connection pipe (53) of the first air conditioning unit (20A). The fifth flow path switching valve (75) communicates the heat transfer pipe (39) of the second heat storage unit (30B) to the air conditioning side connection pipe (53) of the second air conditioning unit (20B) to connect the first connection pipe (81 ) And the second connecting pipe (82). The sixth flow path switching valve (76) connects the heat transfer pipe (39) of the second heat storage unit (30B) to the air conditioning side connection pipe (53) of the second air conditioning unit (20B) to connect the third connection pipe (83 ) And the fourth connecting pipe (84). The seventh flow path switching valve (77) communicates the heat transfer pipe (39) of the third heat storage unit (30C) to the air conditioning side connection pipe (53) of the third air conditioning unit (20C) to connect the second connection pipe (82 ). The eighth flow path switching valve (78) communicates the heat transfer pipe (39) of the third heat storage unit (30C) to the air conditioning side connection pipe (53) of the third air conditioning unit (20C) to connect the fourth connection pipe (84 ).

    By switching the first to eighth flow path switching valves (71 to 78) as described above, the heat transfer tube (39) of the first heat storage unit (30A) is connected to the hot water supply refrigerant circuit (40) of the hot water supply device (10). ), The heat transfer tube (39) of the second heat storage unit (30B) is connected to the refrigerant circuit (21) for air conditioning of the second air conditioning unit (20B), and the heat transfer tube of the third heat storage unit (30C) ( 39) is connected to the air conditioning refrigerant circuit (21) of the third air conditioning unit (20C). That is, in the first heat storage unit (30A), the refrigerant of the hot water supply refrigerant circuit (40) flows into the heat transfer pipe (39), and in the second heat storage unit (30B), the second air conditioning unit (30) is connected to the heat transfer pipe (39). The refrigerant of the air conditioning refrigerant circuit (21) of 20B) flows in, and in the third heat storage unit (30C), the refrigerant of the air conditioning refrigerant circuit (21) of the third air conditioning unit (20C) flows into the heat transfer pipe (39). To do. In each heat storage tank (31), the heat storage medium in the heat storage tank (31) is cooled by the refrigerant flowing through each heat transfer tube (39).

    Here, in Embodiment 2, water is stored in each heat storage tank (31) as a heat storage medium. Therefore, the heat storage device (30) stores cold energy by freezing water stored as a heat storage medium in each heat storage tank (31). That is, in the cold storage operation, the water in the heat storage tank (31) is cooled by the refrigerant flowing through the heat transfer pipe (39), and the water around the heat transfer pipe (39) is frozen to become ice. In the cold storage operation of the second embodiment, the cold heat thus obtained by the refrigeration cycle in the hot water supply refrigerant circuit (40) and the refrigeration in the air conditioning refrigerant circuit (21) of the second and third air conditioning units (20B, 20C). The cold energy obtained by the cycle is stored in the heat storage device (30).

    As described above, even during the cold storage operation of the second embodiment, the hot water supply air conditioning system (1) performs the hot water supply side cold storage operation and the air conditioning side cold storage operation simultaneously. If almost all of the water in the hot water tank (11) becomes hot water of about 80 to 90 ° C. or the amount of hot water in the hot water tank (11) reaches the amount that can meet the hot water demand on the next day, The air conditioning system (1) stops the hot water supply side heat storage operation and performs only the air conditioning side heat storage operation.

<First use cooling operation>
The first use cooling operation will be described with reference to FIG. In the first use cooling operation, the cooling of the air conditioning units (20A, 20B, 20C) is performed using only the cold heat stored in each heat storage tank (31). In the first use cooling operation, the hot water supply device (10) is stopped.

    In the air conditioner (20), the refrigerant circulation operation using the compressor (22) as a gas pump is performed in the air conditioning refrigerant circuit (21) of each air conditioning unit (20A, 20B, 20C). This refrigerant circulation operation is the same as in the first embodiment except that the air-conditioning side heat exchanger (34) is replaced with the heat transfer pipe (39) and the refrigerant flowing through the heat transfer pipe (39) dissipates heat to the heat storage medium of the heat storage tank (31). Since it is substantially the same, description is abbreviate | omitted.

    In the heat storage device (30), the first flow path switching valve (71) and the second flow path switching valve (72) respectively connect the heat transfer pipe (39) of the first heat storage unit (30A) to the first air conditioning unit (20A). Communicating with the air conditioning side connecting pipe (53) and shutting off from the hot water supply side connecting pipe (50). The fifth flow path switching valve (75) communicates the heat transfer pipe (39) of the second heat storage unit (30B) to the air conditioning side connection pipe (53) of the second air conditioning unit (20B) to connect the first connection pipe (81 ) And the second connecting pipe (82). The sixth flow path switching valve (76) connects the heat transfer pipe (39) of the second heat storage unit (30B) to the air conditioning side connection pipe (53) of the second air conditioning unit (20B) to connect the third connection pipe (83 ) And the fourth connecting pipe (84). The seventh flow path switching valve (77) communicates the heat transfer pipe (39) of the third heat storage unit (30C) to the air conditioning side connection pipe (53) of the third air conditioning unit (20C) to connect the second connection pipe (82 ). The eighth flow path switching valve (78) communicates the heat transfer pipe (39) of the third heat storage unit (30C) to the air conditioning side connection pipe (53) of the third air conditioning unit (20C) to connect the fourth connection pipe (84 ).

    By switching the first to eighth flow path switching valves (71 to 78) as described above, the heat transfer pipe (39) of each heat storage unit (30A to 30C) is used for air conditioning of each air conditioning unit (20A to 20C). Connected to the refrigerant circuit (21). That is, in each heat storage unit (30A-30C), the refrigerant of the air conditioning refrigerant circuit (21) of each air conditioning unit (20A-20C) flows into the heat transfer tube (39). As a result, in each heat storage tank (31), the heat storage medium absorbs heat from the refrigerant flowing through each heat transfer tube (39), and the refrigerant flowing through each heat transfer tube (39) is cooled. That is, the refrigerant flowing through each heat transfer tube (39) is cooled by the ice in the heat storage tank (31). As a result, the ice in each heat storage tank (31) melts.

<Second use cooling operation>
The second usage cooling operation will be described with reference to FIG. In the second use cooling operation, the cold heat stored in each heat storage tank (31) and the cold heat obtained by the refrigeration cycle performed by the air conditioning refrigerant circuit (21) of each air conditioning unit (20A, 20B, 20C) are used. The air conditioning units (20A, 20B, 20C) are cooled in the room. In the second usage cooling operation, the hot water supply device (10) is stopped.

    In the air conditioner (20), the refrigerant circulates in the air conditioning refrigerant circuit (21) of each air conditioning unit (20A, 20B, 20C) to perform a refrigeration cycle. This refrigerant circulation operation is the same as in the first embodiment except that the air-conditioning side heat exchanger (34) is replaced with the heat transfer pipe (39) and the refrigerant flowing through the heat transfer pipe (39) dissipates heat to the heat storage medium of the heat storage tank (31). Since it is substantially the same, description is abbreviate | omitted.

    In the heat storage device (30), the first to eighth flow path switching valves (71 to 78) are switched in the same manner as in the first use cooling operation, and the heat transfer tubes (39) of the heat storage units (30A to 30C) The refrigerant of the air conditioning refrigerant circuit (21) of the air conditioning units (20A to 20C) flows in. As a result, in each heat storage tank (31), the heat storage medium absorbs heat from the refrigerant flowing through each heat transfer tube (39), and the refrigerant flowing through each heat transfer tube (39) is cooled. That is, the refrigerant flowing through each heat transfer tube (39) is cooled by the ice in the heat storage tank (31). As a result, the ice in each heat storage tank (31) melts.

<Heat storage operation>
The heat storage operation will be described with reference to FIG. In the heat storage operation, heat is obtained by the refrigeration cycle performed by the air conditioning refrigerant circuit (21) of each air conditioning unit (20A, 20B, 20C), and the obtained heat is stored in each heat storage tank (31). In the heat storage operation, the hot water supply device (10) stops.

    In the air conditioner (20), the refrigerant circulates in the air conditioning refrigerant circuit (21) of each air conditioning unit (20A, 20B, 20C) to perform a refrigeration cycle. This refrigerant circulation operation is performed by the fact that the air-conditioning side heat exchanger (34) is replaced with the heat transfer pipe (39) and the refrigerant flowing through the heat transfer pipe (39) dissipates heat to the heat storage medium of the heat storage tank (31), the fourth three-way valve ( 57) is switched to a state in which the eighth three-way valve (61) communicates with the air conditioning side connection pipe (53) and is shut off from the indoor expansion valve (26), and the eighth three-way valve (61) is switched to the second bypass pipe. Except for switching (55) to the fourth three-way valve (57) and switching to the state of blocking from the third three-way valve (56), the description is omitted.

    In the heat storage device (30), the first to eighth flow path switching valves (71 to 78) are switched in the same manner as in the first use cooling operation, and the heat transfer tubes (39) of the heat storage units (30A to 30C) The refrigerant of the air conditioning refrigerant circuit (21) of the air conditioning units (20A to 20C) flows in. As a result, in each heat storage tank (31), the heat storage medium is heated by the refrigerant flowing through each heat transfer tube (39). The heat storage device (30) thus stores the heat of the refrigerant discharged from the compressor (22) in each heat storage tank (31).

<Use heating operation>
The utilization heating operation will be described with reference to FIG. In the use heating operation, the indoors of the air conditioning units (20A, 20B, 20C) are heated using the heat stored in the heat storage tanks (31). In the use heating operation, the hot water supply device (10) stops.

    In the air conditioner (20), the refrigerant circulates in the air conditioning refrigerant circuit (21) of each air conditioning unit (20A, 20B, 20C) to perform a refrigeration cycle. This refrigerant circulation operation is the same as that of Embodiment 1 except that the air-conditioning side heat exchanger (34) is replaced with the heat transfer pipe (39) and the refrigerant flowing through the heat transfer pipe (39) absorbs heat from the heat storage medium of the heat storage tank (31). Since it is almost the same, the description is omitted.

    In the heat storage device (30), the first to eighth flow path switching valves (71 to 78) are switched in the same manner as in the first use cooling operation, and the heat transfer tubes (39) of the heat storage units (30A to 30C) The refrigerant of the air conditioning refrigerant circuit (21) of the air conditioning units (20A to 20C) flows in. As a result, in each heat storage tank (31), the heat storage medium radiates heat to the refrigerant flowing through each heat transfer tube (39), and the refrigerant flowing through each heat transfer tube (39) is heated.

    As described above, also in the hot water supply air conditioning system (1) of the second embodiment, not only the hot water supply side heat storage operation but also the air conditioning side heat storage operation is performed during the cold storage operation. Thereby, there can exist the same effect as Embodiment 1. FIG. Moreover, according to the hot water supply air conditioning system (1) of Embodiment 2, the hot water supply side heat exchanger and the air conditioning side heat exchanger according to the present invention are provided by the heat transfer tube (39) provided in the heat storage tank (31). By configuring, the number of parts of the hot water supply air conditioning system can be reduced. Therefore, the hot water supply air conditioning system can be configured at low cost.

<< Embodiment 3 of the Invention >>
The hot water supply air conditioning system (1) of the third embodiment is obtained by changing the operations in the first use cooling operation and the second use cooling operation in the hot water supply air conditioning system (1) of the second embodiment. Hereinafter, operations of the first use cooling operation and the second use cooling operation different from those of the second embodiment will be described.

    Here, in Embodiment 2, in the cold storage operation, cold heat obtained by the refrigeration cycle in the hot water supply refrigerant circuit (40) of the hot water supply device (10) is stored in the heat storage tank (31) of the first heat storage unit (30A). The stored heat storage tank (31) of the second and third heat storage units (30B, 30C) has a hot water supply refrigerant circuit (40 for the second and third air conditioning units (20B, 20C) of the air conditioner (20)). The cold energy obtained by the refrigeration cycle is stored. In the cold storage operation, when almost all of the water in the hot water storage tank (11) becomes hot water of about 80-90 ° C, or the amount of hot water in the hot water storage tank (11) reaches an amount that can meet the demand for hot water supply on the next day. The hot water supply air conditioning system (1) stops the hot water supply side heat storage operation. That is, cold energy cannot be stored in the heat storage tank (31) of the first heat storage unit (30A). Therefore, the cold energy stored in the heat storage tank (31) of the first heat storage unit (30A) is less than that of the heat storage tank (31) of the second and third heat storage units (30B, 30C).

    Therefore, in the following first use cooling operation and second use cooling operation, first, the first operation similar to that of the second embodiment is performed, and the cooling heat in the heat storage tank (31) of the first heat storage unit (30A) cannot be used. The first air conditioning unit (20A) performs the second operation using the cold energy of the heat storage tank (31) of the second heat storage unit (30B), and further the cold heat of the heat storage tank (31) of the second heat storage unit (30B) When it becomes impossible to use, the first and second air conditioning units (20A, 20B) perform the third operation using the cold energy of the heat storage tank (31) of the third heat storage unit (30C).

<First use cooling operation>
In the third embodiment, in the first use cooling operation, the first to third operations are executed as described above. In the first operation (see FIG. 12), when the ice in the heat storage tank (31) of the first heat storage unit (30A) is completely or substantially melted and the refrigerant flowing in the heat transfer tube (39) cannot be cooled, As shown in FIG. 16, the third to sixth flow path switching valves (73 to 76) are switched to the second operation.

    In the second operation, the third flow path switching valve (73) connects the sixth three-way valve (59) of the first air conditioning unit (20A) to the first connection pipe (81) to connect the first flow path switching valve ( 71) is switched to the shut-off state. The fourth flow path switching valve (74) connects the fourth three-way valve (57) of the first air conditioning unit (20A) to the third connection pipe (83) and shuts off from the second flow path switching valve (72). Switch to state. The fifth flow path switching valve (75) communicates the sixth three-way valve (59) of the second air conditioning unit (20B) to the first connection pipe (81) and the heat transfer pipe (39) of the second heat storage unit (30B). In this way, the second connection pipe (82) is switched to a shut-off state. The sixth flow path switching valve (76) communicates the fourth three-way valve (57) of the second air conditioning unit (20B) to the third connection pipe (83) and the heat transfer pipe (39) of the second heat storage unit (30B). In this way, the state is switched to the state where the fourth connection pipe (84) is cut off.

    Thus, by switching the 3rd-6th flow-path switching valve (73-76), it discharges from the compressor (22) of a 1st air conditioning unit (20A), and passes 1st bypass piping (54). Then, the refrigerant flowing into the sixth three-way valve (59) passes through the first connection pipe (81), and merges with the refrigerant from the second air conditioning unit (20B) in the fifth flow path switching valve (75). 2 It flows into the heat transfer tube (39) of the heat storage unit (30B). The refrigerant cooled by the heat storage medium in the heat storage tank (31) in the heat transfer tube (39) of the second heat storage unit (30B) is divided in the sixth flow path switching valve (76), and a part thereof is the third connection pipe. (83) and the fourth flow path switching valve (74) and flows into the fourth three-way valve (57) of the first air conditioning unit (20A), and the rest is the fourth three-way valve of the second air conditioning unit (20B). Flows into (57). Other operations are the same as the first operation. In such a second operation, when the ice flowing in the heat storage tank (31) of the second heat storage unit (30B) is eventually completely melted or almost melted and the refrigerant flowing in the heat transfer tube (39) can no longer be cooled, FIG. As shown, the fifth to eighth flow path switching valves (75 to 78) are switched to the third operation.

    In the third operation, the fifth flow path switching valve (75) causes the sixth three-way valve (59) and the first connection pipe (81) of the second air conditioning unit (20B) to communicate with the second connection pipe (82). Thus, the state is switched to the state where the heat transfer tube (39) of the second heat storage unit (30B) is cut off. The sixth flow path switching valve (76) communicates the fourth three-way valve (57) and the third connection pipe (83) of the second air conditioning unit (20B) with the fourth connection pipe (84) to provide a second heat storage unit. It is switched to the state of shutting off from the heat transfer tube (39) of (30B). The seventh flow path switching valve (77) communicates the sixth three-way valve (59) of the third air conditioning unit (20C) and the second connection pipe (82) to the heat transfer pipe (39) of the third heat storage unit (30C). It is switched to the state to be made. The eighth flow path switching valve (78) communicates the fourth three-way valve (57) and the fourth connection pipe (84) of the third air conditioning unit (20C) to the heat transfer pipe (39) of the third heat storage unit (30C). It is switched to the state to be made.

    By switching the fifth to eighth flow path switching valves (75 to 78) in this way, the air is discharged from the compressor (22) of the first air conditioning unit (20A) and passes through the first bypass pipe (54). The refrigerant flowing into the sixth three-way valve (59) passes through the first connection pipe (81) and merges with the refrigerant from the second air conditioning unit (20B) in the fifth flow path switching valve (75). Passes through the two connecting pipes (82), merges with the refrigerant from the third air conditioning unit (20C) at the seventh flow path switching valve (77), and flows into the heat transfer pipe (39) of the third heat storage unit (30C). . The refrigerant cooled by the heat storage medium in the heat storage tank (31) in the heat transfer tube (39) of the third heat storage unit (30C) is divided in the eighth flow path switching valve (78), and a part thereof is the fourth connection pipe. (84) and flows into the sixth flow path switching valve (76), and the remainder flows into the fourth three-way valve (57) of the third air conditioning unit (20C). The refrigerant that has flowed into the sixth flow path switching valve (76) is diverted in the sixth flow path switching valve (76), and partly passes through the third connection pipe (83) and the fourth flow path switching valve (74). Then, it flows into the fourth three-way valve (57) of the first air conditioning unit (20A), and the rest flows into the fourth three-way valve (57) of the second air conditioning unit (20B). Other operations are the same as the first and second operations. In such a third operation, if the ice in the heat storage tank (31) of the third heat storage unit (30C) is eventually completely or substantially melted and the refrigerant flowing in the heat transfer tube (39) can no longer be cooled, the first use cooling End driving.

<Second use cooling operation>
In the third embodiment, in the second usage cooling operation, the first to third operations are executed as described above. And in 1st operation | movement (refer FIG. 13) similar to 2nd utilization air_conditionaing | cooling operation of Embodiment 2, all or substantially the ice in the heat storage tank (31) of a 1st heat storage unit (30A) melt | dissolved, and a heat exchanger tube ( 39) When the refrigerant flowing in the interior can no longer be cooled, as shown in FIG. 18, the third to sixth flow path switching valves (73 to 76) are switched in the same manner as in the first use cooling operation, so that the second operation is performed. Can be switched.

    By switching the 3rd-6th flow-path switching valve (73-76), it discharges from the compressor (22) of a 1st air conditioning unit (20A), an outdoor heat exchanger (24), and an outdoor expansion valve (25 ) Passed through the first three-way valve (59) through the first connecting pipe (81) and the refrigerant from the second air conditioning unit (20B) in the fifth flow path switching valve (75). Merge and flow into the heat transfer tube (39) of the second heat storage unit (30B). The refrigerant cooled by the heat storage medium in the heat storage tank (31) in the heat transfer tube (39) of the second heat storage unit (30B) is divided in the sixth flow path switching valve (76), and a part thereof is the third connection pipe. (83) and the fourth flow path switching valve (74) and flows into the fourth three-way valve (57) of the first air conditioning unit (20A), and the rest is the fourth three-way valve of the second air conditioning unit (20B). Flows into (57). Other operations are the same as the first operation. In such a second operation, when the ice flowing in the heat storage tank (31) of the second heat storage unit (30B) is all or almost melted and the refrigerant flowing in the heat transfer tube (39) can no longer be cooled, FIG. As shown, the fifth to eighth flow path switching valves (75 to 78) are switched to the third operation in the same manner as in the first use cooling operation.

    When the fifth to eighth flow path switching valves (75 to 78) are switched, they are discharged from the compressor (22) of the first air conditioning unit (20A), and the outdoor heat exchanger (24) and the outdoor expansion valve (25 ) And the refrigerant flowing into the sixth three-way valve (59) passes through the first connection pipe (81) and the refrigerant from the second air conditioning unit (20B) in the fifth flow path switching valve (75). It merges, passes through the second connecting pipe (82), joins with the refrigerant from the third air conditioning unit (20C) in the seventh flow path switching valve (77), and heat transfer pipe (39 of the third heat storage unit (30C)) ). The refrigerant cooled by the heat storage medium in the heat storage tank (31) in the heat transfer tube (39) of the third heat storage unit (30C) is divided in the eighth flow path switching valve (78), and a part thereof is the fourth connection pipe. (84) and flows into the sixth flow path switching valve (76), and the remainder flows into the fourth three-way valve (57) of the third air conditioning unit (20C). The refrigerant that has flowed into the sixth flow path switching valve (76) is diverted in the sixth flow path switching valve (76), and partly passes through the third connection pipe (83) and the fourth flow path switching valve (74). Then, it flows into the fourth three-way valve (57) of the first air conditioning unit (20A), and the rest flows into the fourth three-way valve (57) of the second air conditioning unit (20B). Other operations are the same as the first and second operations. In such a third operation, when the ice in the heat storage tank (31) of the third heat storage unit (30C) is eventually completely melted or almost melted and the refrigerant flowing in the heat transfer tube (39) can no longer be cooled, the second use cooling End driving.

<< Embodiment 4 of the Invention >>
The hot water supply air conditioning system (1) of the fourth embodiment is obtained by changing the configurations of the hot water supply device (10) and the heat storage device (30) in the hot water supply air conditioning system (1) of the second embodiment. The air conditioner (20) is configured in the same manner as in the second embodiment. Hereinafter, a description will be given with reference to FIG.

<Water heater>
In the fourth embodiment, the hot water supply device (10) includes first to third hot water supply units (10A, 10B, 10C). Each hot water supply unit (10A, 10B, 10C) includes a hot water supply refrigerant circuit (40) and a fan (46a) similar to those of the second embodiment.

<Heat storage device>
In the fourth embodiment, the heat storage device (30) includes the first and second flow path switching valves (81, 82) provided only in the first heat storage unit (30A) in the second embodiment. It is also provided in the heat storage unit (30B, 30C).

    Specifically, in the fourth embodiment, in each of the heat storage units (30A, 30B, 30C), the first flow path switching valve (71) and the second flow path switching valve (72) are connected to the hot water supply side connection pipe ( 50) and the midway part of the air conditioning side connection pipe (53) of each air conditioning unit (20A, 20B, 20C). In the hot water supply side connection pipe (50), the first flow path switching valve (71) is connected to the second three-way valve (52) side, and the second flow path switching valve (72) is connected to the first three-way valve (51) side. It is connected. On the other hand, in the air conditioning side connection pipe (53) of each air conditioning unit (20A, 20B, 20C), each first flow path switching valve (71) is connected to the third three-way valve (56) side, and each second flow path. The switching valve (72) is connected to the fourth three-way valve (57) side. In each heat storage unit (30A, 30B, 30C), one end of the heat transfer tube (39) of the corresponding heat storage unit (30A, 30B, 30C) is connected to the first flow path switching valve (71), and the second The other end of the heat transfer tube (39) of the corresponding heat storage unit (30A, 30B, 30C) is connected to the flow path switching valve (72). The first flow path switching valve (71) and the second flow path switching valve (72) connect the heat transfer pipe (39) to the hot water supply side connection pipe (50) and shut off from the air conditioning side connection pipe (53). The heat transfer pipe (39) is connected to the air conditioning side connection pipe (53) and switched to a state where it is cut off from the hot water supply side connection pipe (50).

    Other configurations are the same as those of the second embodiment. Even if it is such a form, the driving | operation similar to Embodiment 2 can be performed and there can exist the same effect. Further, according to the fourth embodiment, in the cold storage operation, the first and second heat storage units (30A, 30B) store the cold heat obtained by the hot water supply side cold storage operation, and the third heat storage unit (30C) stores the air conditioning side cold storage. It is also possible to store the cold energy obtained by the operation.

<< Other Embodiments >>
About the said embodiment, it is good also as the following structures.

    In each of the above embodiments, in the cold storage operation, the hot water supply side cold storage operation and the air conditioning side cold storage operation are performed at the same time, and almost all of the water in the hot water storage tank (11) becomes high-temperature water of about 80 to 90 ° C, or the hot water storage tank (11) When the amount of hot water in the water reaches the amount that can meet the demand for hot water supply the next day, the hot water supply side heat storage operation was stopped. However, the hot water supply side cold storage operation and the air conditioning side cold storage operation are not necessarily performed simultaneously. For example, the air conditioning side cold storage operation may be performed after the hot water supply side cold storage operation is performed.

    In each of the above embodiments, the hot water supply device (10) includes the low-temperature side circuit (41) and the high-temperature side circuit (42) and is configured to perform the dual refrigeration cycle. However, the cascade heat exchanger A single-stage refrigeration cycle may be configured by providing only the low-temperature circuit (41) in which (43) is changed to the heating heat exchanger (48).

    In each of the above embodiments, only one compressor (22) is connected to the air conditioning refrigerant circuit (21), but a plurality of compressors (22) may be connected. In that case, a 1st utilization air_conditionaing | cooling operation is attained by making it a rotary type compressor which can utilize at least 1 compressor (22) as a gas pump. The other compressor may be a compressor other than the rotary compressor, for example, a scroll compressor.

    In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use.

    As described above, the present invention is useful for a hot water supply air conditioning system including a hot water supply device, an air conditioner, and a heat storage device.

1 Hot water supply air conditioning system
10 Water heater
20 Air conditioner
21 Air conditioning refrigerant circuit
24 outdoor heat exchanger
27 Indoor heat exchanger
30 heat storage device
31 heat storage tank
33 Hot water supply side heat exchanger
34 Air-conditioning side heat exchanger
39 Heat transfer tubes (hot water supply side heat exchanger, air conditioning side heat exchanger)
40 Refrigerant circuit for hot water supply

Claims (3)

A hot water supply apparatus having a hot water storage tank (11) for storing hot water for hot water supply, and a hot water supply refrigerant circuit (40) connected to a heating heat exchanger (48) for heating water in the hot water storage tank (11) (10) and
An air conditioner (20) that has an air conditioning refrigerant circuit (21) to which an indoor heat exchanger (27) and an outdoor heat exchanger (24) are connected, and that air-conditions the room;
A heat storage tank (31) for storing the heat storage medium, a hot water supply side heat exchanger (33) for exchanging heat between the refrigerant in the hot water supply refrigerant circuit (40) and the heat storage medium in the heat storage tank (31), and the air conditioning A heat storage device (30) having an air conditioning side heat exchanger (34) for exchanging heat between the refrigerant in the refrigerant circuit (21) and the heat storage medium in the heat storage tank (31),
A cold storage operation in which the heat storage device (30) cools the heat storage medium in the heat storage tank (31);
The air conditioner (20) circulates the refrigerant in the air conditioning refrigerant circuit (21) so as to flow from the air conditioning side heat exchanger (34) to the indoor heat exchanger (27), and the heat storage device (30) Is configured to be capable of performing a cooling operation that cools the refrigerant flowing through the air-conditioning side heat exchanger (34) with a heat storage medium in the heat storage tank (31),
During the cold storage operation,
The hot water supply refrigerant circuit (40) of the hot water supply device (10) performs a refrigeration cycle in which the heating heat exchanger (48) serves as a radiator and the hot water supply side heat exchanger (33) serves as an evaporator, A hot water storage side cold storage operation in which the heat storage device (30) cools the heat storage medium in the heat storage tank (31) in the hot water supply side heat exchanger (33);
The refrigerant circuit (21) for air conditioning of the air conditioner (20) performs a refrigeration cycle in which the outdoor heat exchanger (24) serves as a radiator and the air conditioning side heat exchanger (34) serves as an evaporator, The hot water supply air conditioner characterized in that the heat storage device (30) can simultaneously execute the air conditioning side cold storage operation for cooling the heat storage medium in the heat storage tank (31) in the air conditioning side heat exchanger (34) in parallel. system. In claim 1,
The heat storage device (30)
A first circulation path (35a, 35b) for circulating a heat storage medium between the hot water supply side heat exchanger (33) and the heat storage tank (31);
A hot water supply air conditioning system comprising: a second circulation path (35a, 35c) for circulating a heat storage medium between the air conditioning side heat exchanger (34) and the heat storage tank (31). In claim 1,
The heat storage tank (31) is provided with a heat transfer tube (39) for exchanging heat between the refrigerant flowing through the heat storage medium and the heat storage medium, and the heat transfer tube (39) includes the hot water supply side heat exchanger and the air conditioning side heat. A hot water supply air conditioning system that also serves as an exchanger.

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