JP2018189321A - Heat pump system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce load in each heat pump by enabling each heat pump to use waste heat in a heat pump system having the air-conditioning heat pump and the hot water supply heat pump.SOLUTION: In a heat pump system 10, an air-conditioning heat pump 11 includes an air-conditioning refrigerant circuit 21 for circulating an air-conditioning refrigerant, and a hot water supply heat pump 12 includes a hot water supply refrigerant circuit 41 for circulating a hot water supply refrigerant. During cooling hot water supply operation, heat is exchanged between the air-conditioning refrigerant circulating in a refrigerant circulation passage R3 and the hot water supply refrigerant circulating a refrigerant circulation passage L2 in a heat exchanger 35 between refrigerants, and through the heat exchange, heat of the air-conditioning refrigerant is emitted to the hot water supply refrigerant. During heating hot water supply operation, heat is exchanged between the air-conditioning refrigerant circulating in the refrigerant circulation passage and the hot water supply refrigerant circulating in the refrigerant circulation passage in the heat exchanger 35 between refrigerants, and through the heat exchange, heat of the hot water supply refrigerant is emitted to the air-conditioning refrigerant.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a heat pump system including a heat pump for air conditioning and a heat pump for hot water supply.

  Patent Document 1 discloses a heat pump system including an air conditioning heat pump that performs air conditioning in a building and a hot water supply heat pump that generates (boils) hot water (hot water) used in the building. In this heat pump system, the air conditioning heat pump has an air conditioning refrigerant circuit that circulates the air conditioning refrigerant, and heats and cools the room by exchanging heat between the air conditioning refrigerant and room air. Moreover, the hot water supply heat pump has a hot water supply refrigerant circuit for circulating the hot water supply refrigerant, and heats water between the hot water supply refrigerant and the water circulating in the water circulation flow path to generate hot water. It has become a thing.

  Further, the heat pump system disclosed in Patent Document 1 includes an inter-refrigerant heat exchanger that performs heat exchange between an air-conditioning refrigerant that circulates through an air-conditioning refrigerant circuit and a hot-water supply refrigerant that circulates through a hot-water supply refrigerant circuit. It has been. In this inter-refrigerant heat exchanger, when the air-conditioning heat pump and the hot water supply heat pump are operating simultaneously, heat exchange between the refrigerants is performed, and the heat (exhaust heat) of the air-conditioning refrigerant is supplied by the heat exchange. It is collected (absorbed) by the refrigerant for use. In this case, the hot water supply heat pump can reduce the load by utilizing the exhaust heat.

JP 2010-236817 A

  By the way, in the heat pump system of Patent Document 1 described above, the cooling operation of the air conditioning heat pump and the water heating operation (water heating operation) of the hot water supply heat pump are performed simultaneously, and the heating operation and the hot water supply of the air conditioning heat pump are performed. The exhaust heat of the air conditioning refrigerant is recovered by the hot water supply heat pump both in the heating hot water supply operation in which the water heating operation of the heat pump is performed simultaneously. For this reason, in the heat pump system of Patent Document 1 described above, the load reduction due to the use of exhaust heat is achieved by the hot water supply heat pump both during the cooling hot water supply operation and during the heating hot water supply operation.

  However, considering the life and performance degradation of the entire heat pump system, it is considered desirable to reduce the load in a balanced manner in both the air conditioning heat pump and the hot water supply heat pump. In that respect, it is considered that there is still room for improvement in the system of Patent Document 1 in which the load reduction due to the use of exhaust heat is achieved by the heat pump for hot water supply both during the cooling hot water supply operation and during the heating hot water supply operation.

  The present invention has been made in view of the above circumstances, and in a heat pump system including an air conditioning heat pump and a hot water supply heat pump, the heat pumps mutually use waste heat, thereby reducing the load of each heat pump. This is the main purpose.

  In order to solve the above problems, a heat pump system according to a first aspect of the present invention includes an air conditioning refrigerant circuit that circulates an air conditioning refrigerant, and performs air conditioning by performing heat exchange between the air conditioning refrigerant and room air. And a hot water supply heat pump having a hot water supply refrigerant circuit for circulating the hot water supply refrigerant and heating the water by heat exchange between the hot water supply refrigerant and the water circulating in the water circulation passage. In the heat pump system, the air conditioning refrigerant circuit circulates the air conditioning refrigerant as a switchable flow path during a cooling hot water supply operation in which a cooling operation of the air conditioning heat pump and a water heating operation of the hot water supply heat pump are performed simultaneously. The air conditioning refrigerant during the heating and hot water supply operation in which the heating operation of the air conditioning heat pump and the water heating operation of the hot water supply heat pump are performed simultaneously. A second air-conditioning circulation channel that circulates, and the hot-water supply refrigerant circuit circulates as a switchable channel, a first hot-water supply circulation channel that circulates the hot-water supply refrigerant during the cooling and hot-water supply operation, and the heating and hot water supply A second hot water supply circulation path for circulating the hot water supply refrigerant during operation, the air conditioning refrigerant circulating in the first air conditioning circulation path, and the hot water supply refrigerant circulating in the first hot water circulation path Heat exchange between the first air exchange means for releasing the heat of the air conditioning refrigerant to the hot water supply refrigerant, the air conditioning refrigerant circulating in the second air conditioning circulation channel, and the second And a second heat exchange means for releasing heat from the hot water supply refrigerant to the air conditioning refrigerant by performing heat exchange with the hot water supply refrigerant circulating in the hot water supply circulation channel. To do.

  According to the present invention, during the cooling hot water supply operation, the air conditioning refrigerant circulates through the first air conditioning circulation passage and the hot water supply refrigerant circulates through the first hot water supply circulation passage. Heat exchange is performed between the refrigerants. Then, heat of the air conditioning refrigerant is released to the hot water supply refrigerant by the heat exchange. In this case, since the exhaust heat of the air conditioning refrigerant can be recovered on the hot water supply heat pump side, the load of the hot water supply heat pump can be reduced using the exhaust heat.

  On the other hand, during the heating and hot water supply operation, the air conditioning refrigerant circulates through the second air conditioning circulation passage and the hot water supply refrigerant circulates through the second hot water supply circulation passage, so that the second heat exchange means can connect each of the refrigerants. Heat exchange takes place at. And the heat of the hot water supply refrigerant is released to the air conditioning refrigerant by the heat exchange. In this case, since the exhaust heat of the hot water supply refrigerant can be recovered on the air conditioning heat pump side, the exhaust heat can be used to reduce the load on the air conditioning heat pump. Therefore, by using exhaust heat in both the air conditioning heat pump and the hot water supply heat pump, the load can be reduced in each of the heat pumps.

  A heat pump system according to a second aspect of the present invention is the heat pump system according to the first aspect, wherein the air conditioning heat pump includes a first compressor that compresses the air conditioning refrigerant, and the first heat exchange means is in the cooling hot water supply operation. Heat exchange is performed between the air-conditioning refrigerant discharged from the first compressor in the first air-conditioning circulation flow path and the hot-water supply refrigerant circulating in the first hot-water supply circulation flow path. Features.

  According to the present invention, during the cooling and hot water supply operation, heat exchange is performed between the high-temperature air-conditioning refrigerant discharged from the first compressor and the hot water supply refrigerant in the first heat exchange means. Waste heat recovery at high temperature can be performed. Thereby, the load reduction of the heat pump for hot water supply can be aimed at suitably.

  In the heat pump system according to a third aspect of the present invention, in the first or second aspect of the invention, the hot water supply heat pump compresses the hot water supply refrigerant, and the hot water supply refrigerant discharged from the second compressor. And a water heat exchanger that heats the water by performing heat exchange between the water circulating in the water circulation flow path, and the second heat exchange means is configured to circulate the second hot water supply circulation during the heating hot water supply operation. Heat exchange is performed between the hot water supply refrigerant after passing through the water heat exchanger in the flow path and the air conditioning refrigerant circulating in the second air conditioning circulation flow path. .

  According to the present invention, during the heating and hot water supply operation, the second heat exchange means performs heat exchange between the hot water supply refrigerant and the air conditioning refrigerant after passing through the water heat exchanger. In this case, since the heat (residual heat) of the hot water supply refrigerant after heat exchange with water in the water heat exchanger is recovered by the air conditioning heat pump, the water heating capacity in the water heat exchanger is reduced. Therefore, it is possible to reduce the load of the air conditioning heat pump.

  A heat pump system according to a fourth aspect of the present invention is the heat pump system according to any one of the first to third aspects, wherein the first heat exchange means and the second heat exchange means are configured by a common heat exchanger, Both the passage and the hot water supply circulation passages are passages that pass through the common heat exchanger.

  According to the present invention, since the first heat exchange means and the second heat exchange means are shared, the number of heat exchangers can be reduced. Thus, the effects of the first invention can be obtained while simplifying the configuration and the like.

  The heat pump system according to a fifth aspect of the present invention is the heat pump system according to any one of the first to fourth aspects, wherein the first heat exchanging means functions as a condenser of the air conditioning heat pump during the cooling hot water supply operation. The heat exchange means functions as an evaporator of the air conditioning heat pump during the heating and hot water supply operation, and the water heating operation of the hot water supply heat pump is stopped as the air conditioning refrigerant circuit as a switchable flow path. The air conditioning heat pump further includes a third air conditioning circulation passage for circulating the air conditioning refrigerant during an air conditioning single operation in which the air conditioning heat pump performs a cooling operation or a heating operation, and the air conditioning heat pump includes the air conditioning refrigerant, outdoor air, An outdoor heat exchanger that functions as a condenser or an evaporator by exchanging heat between them, and the third air-conditioning circulation channel is not connected to the heat exchange means before passing through the heat exchange means. Characterized in that it is a flow path passing through the outdoor heat exchanger.

  According to the present invention, the first heat exchanging means functions as a condenser of an air conditioning heat pump during the cooling hot water supply operation, and the second heat exchanging means functions as an evaporator of the air conditioning heat pump during the heating hot water supply operation. Here, in such a configuration, when the first heat exchange means functions as a condenser during cooling only operation and the second heat exchange means functions as an evaporator during heating single operation, the operation of the hot water supply heat pump stops. Therefore, it is assumed that the air conditioning refrigerant is not sufficiently condensed or evaporated in the first heat exchange means or the second heat exchange means. In that case, the efficiency of the air-conditioning heat pump may be reduced.

  Therefore, in the present invention, in view of this point, at the time of air conditioning single operation (at the time of single cooling operation and at the time of single heating operation), the air-conditioning refrigerant is circulated through the third air-conditioning circulation channel, thereby It is made to circulate through an outdoor heat exchanger, without passing through an exchange means. This allows the air conditioning refrigerant to condense or evaporate by heat exchange with outdoor air in the outdoor heat exchanger during air conditioning alone operation, leading to a reduction in efficiency of the air conditioning heat pump during air conditioning alone operation. It can be avoided.

  The heat pump system according to a sixth aspect of the present invention is the heat pump system according to the fifth aspect, wherein the hot water supply heat pump serves as a heat exchanger for exchanging heat between the hot water supply refrigerant and outdoor air. The first air conditioning circulation channel that circulates the air conditioning refrigerant during the cooling and hot water supply operation, and the second air conditioning circulation channel that circulates the air conditioning refrigerant during the heating and hot water operation. The route is not via the outdoor heat exchanger.

  According to the present invention, since the outdoor heat exchanger of the hot water supply heat pump is shared with the outdoor heat exchanger of the air conditioning heat pump, the number of outdoor heat exchangers can be reduced, and the configuration can be simplified. be able to.

  Even in such a configuration, the air-conditioning refrigerant circulates through the first heat exchanging means without passing through the outdoor heat exchanger during the cooling hot water supply operation, and the air-conditioning refrigerant passes through the outdoor heat exchanger during the heating hot water supply operation. Since it circulates through the second heat exchange means without going through the exchanger, only the hot water supply refrigerant out of the air conditioning refrigerant and the hot water supply refrigerant flows to the outdoor heat exchanger during the cooling hot water supply operation and the heating hot water supply operation. Can be made. Therefore, the outdoor heat exchanger of the hot water supply heat pump is shared with the outdoor heat exchanger of the air conditioning heat pump, and the heat between the hot water supply refrigerant and the outdoor air during the cooling hot water supply operation and the heating hot water supply operation. A reduction in exchange efficiency can be avoided.

  The heat pump system according to a seventh aspect of the present invention is the heat pump system according to any one of the first to sixth aspects, wherein the cooling circuit and the heating operation of the air conditioning heat pump are stopped as the hot water supply refrigerant circuit as a switchable flow path. And a third hot water supply circulation channel for circulating the hot water supply refrigerant during a single hot water supply operation for performing a water heating operation of the hot water supply heat pump in a state, and the third hot water supply circulation channel passes through the heat exchange means. It is characterized by being a non-flow channel.

  According to the present invention, during the hot water supply single operation, the hot water supply refrigerant circulates through the third hot water supply circulation channel. In this case, the hot water supply refrigerant circulates without passing through either the first heat exchange means or the second heat exchange means. As a result, the operation of the air conditioning heat pump is stopped and the hot water supply refrigerant is circulated through each heat exchanging means even though the air conditioning refrigerant is not circulated, thereby reducing the efficiency of the hot water supply heat pump. You can avoid that.

  In the heat pump system according to an eighth aspect of the present invention, in any one of the first to seventh aspects of the invention, the hot water supply heat pump causes the hot water supply refrigerant to exchange heat between the hot water supply refrigerant and outdoor air. An outdoor heat exchanger for hot water supply that absorbs the heat of outdoor air is provided, and the first hot water supply circulation channel is a channel that passes through the outdoor heat exchanger for hot water supply in addition to the first heat exchange means. It is characterized by.

  According to the present invention, during the cooling hot water supply operation, the hot water supply refrigerant circulates via the hot water supply outdoor heat exchanger in addition to the first heat exchange means. In this case, since the hot water supply refrigerant absorbs (recovers) heat from the air conditioning refrigerant and also absorbs heat from the outdoor air, the efficiency of the hot water supply heat pump can be further improved during the cooling hot water supply operation.

The figure which shows the structure of the heat pump system in 1st Embodiment. The figure which shows the flow of the refrigerant | coolant at the time of air_conditioning | cooling independent operation mode. The figure which shows the flow of the refrigerant | coolant at the time of heating independent operation mode. The figure which shows the flow of the refrigerant | coolant at the time of hot water supply independent operation mode. The figure which shows the flow of the refrigerant | coolant at the time of air-conditioning hot water supply operation mode. The figure which shows the flow of the refrigerant | coolant at the time of heating hot-water supply operation mode. It is a figure which shows the structure of the heat pump system in 2nd Embodiment, and also shows the flow of the refrigerant | coolant at the time of the cooling only operation mode. The figure which shows the flow of the refrigerant | coolant at the time of hot water supply independent operation mode. The figure which shows the flow of the refrigerant | coolant at the time of air-conditioning hot water supply operation mode. The figure which shows the flow of the refrigerant | coolant at the time of heating hot-water supply operation mode.

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a heat pump system that performs air conditioning and hot water supply in a building such as a house is provided. Hereinafter, the configuration of the heat pump system will be described with reference to FIG. FIG. 1 is a diagram showing a configuration of a heat pump system.

  As shown in FIG. 1, a heat pump system 10 is used for air conditioning heat pump 11 for air conditioning (cooling and heating) in a building (indoor) and hot water supply for generating (boiling) hot water used in the building. And a heat pump 12. Each of these heat pumps 11 and 12 is configured by using an outdoor unit 14 provided outdoors and an indoor unit 15 provided indoors. Specifically, the air conditioning heat pump 11 is configured using the outdoor unit 14 and the indoor unit 15, and the hot water supply heat pump 12 is configured using the outdoor unit 14 (only). In FIG. 1, for the sake of convenience, the outdoor unit 14 is indicated by a one-dot chain line rectangular frame, and the indoor unit 15 is indicated by a two-dot chain line rectangular frame.

  The air conditioning heat pump 11 includes an air conditioning refrigerant circuit 21 that circulates an air conditioning refrigerant, and a compressor 22, an indoor heat exchanger 23, an expansion valve 24, and an outdoor heat exchanger 25 provided in the air conditioning refrigerant circuit 21. I have. The air conditioning refrigerant circuit 21 includes a plurality of refrigerant flow paths. The plurality of refrigerant channels include an annular channel 27 (a channel indicated by a thick line in FIG. 2). In the annular flow path 27, the devices 22 to 25, that is, the compressor 22, the indoor heat exchanger 23, the expansion valve 24, and the outdoor heat exchanger 25 are arranged in this order. In this case, these devices 22 to 25 are connected in series via the annular flow path 27. For example, HFC is used as the air conditioning refrigerant.

  The compressor 22 compresses the air-conditioning refrigerant to bring the air-conditioning refrigerant to a high temperature and high pressure. The compressor 22 corresponds to the first compressor. The indoor heat exchanger 23 performs heat exchange between the air-conditioning refrigerant and the room air. The indoor heat exchanger 23 is provided in the indoor unit 15, and the indoor unit 15 is provided with a fan (not shown) that sends indoor air toward the indoor heat exchanger 23.

  The expansion valve 24 expands the air-conditioning refrigerant to make the air-conditioning refrigerant low temperature and low pressure. The outdoor heat exchanger 25 performs heat exchange between the air conditioning refrigerant and outdoor air (outside air). The outdoor heat exchanger 25 is provided in the outdoor unit 14, and the outdoor unit 14 is provided with a fan (not shown) that sends outdoor air toward the outdoor heat exchanger 25.

  A four-way valve 28 is provided in the annular flow path 27. The four-way valve 28 switches the direction of the air-conditioning refrigerant flowing through the annular flow path 27 (and thus the air-conditioning refrigerant circuit 21). By switching the flow direction of the air conditioning refrigerant by the four-way valve 28, the air conditioning heat pump 11 can be switched between the cooling operation and the heating operation. Specifically, the four-way valve 28 connects the indoor heat exchanger 23 to the suction side of the compressor 22 and connects the outdoor heat exchanger 25 (or an inter-refrigerant heat exchanger 35 described later) to the discharge side of the compressor 22. The state (see FIGS. 2 and 5), an outdoor heat exchanger 25 (or a refrigerant heat exchanger 35 described later) is connected to the suction side of the compressor 22, and the indoor heat exchanger 23 is connected to the discharge side of the compressor 22. The flow path can be switched to the state of connecting the two (see FIGS. 3 and 6), and the flow path is switched to the former state during the cooling operation and to the latter state during the heating operation.

  A heat exchange channel 31 is connected to the annular channel 27. One end of the heat exchange channel 31 is interposed between the compressor 22 and the outdoor heat exchanger 25 in the annular channel 27 via the three-way valve 32 (more specifically, between the four-way valve 28 and the outdoor heat exchanger 25). The other end is connected between the expansion valve 24 and the outdoor heat exchanger 25 in the annular flow path 27 via the three-way valve 33.

  An inter-refrigerant heat exchanger 35 is provided in the heat exchange channel 31. The inter-refrigerant heat exchanger 35 exchanges heat between the air-conditioning refrigerant flowing through the heat-exchange channel 31 and the hot-water supply refrigerant flowing through the hot-water supply refrigerant circuit 41 (details will be described later) of the hot-water supply heat pump 12. Is. In this case, the inter-refrigerant heat exchanger 35 is arranged in parallel with the outdoor heat exchanger 25.

  Next, the hot water supply heat pump 12 will be described.

  The hot water supply heat pump 12 includes a hot water supply refrigerant circuit 41 that circulates a hot water supply refrigerant, and a compressor 42, a water heat exchanger 43, an expansion valve 44, and an outdoor heat exchanger 25 provided in the hot water supply refrigerant circuit 41. I have. The hot water supply refrigerant circuit 41 includes a plurality of refrigerant flow paths. The plurality of refrigerant channels include an annular channel 47 (a channel indicated by a thick line in FIG. 4). In the annular channel 47, the devices 42 to 44, 25, that is, the compressor 42, the water heat exchanger 43, the expansion valve 44, and the outdoor heat exchanger 25 are arranged in this order. In this case, the devices 42 to 44 and 25 are connected in series via the annular channel 47. For example, CO2 is used as the hot water supply refrigerant.

  The compressor 42 compresses the hot water supply refrigerant to bring the hot water supply refrigerant to a high temperature and high pressure. The compressor 42 corresponds to the second compressor. The water heat exchanger 43 exchanges heat between the high-temperature hot water supply refrigerant discharged from the compressor 42 and the water circulating in the water circulation passage 51. The water circulation passage 51 is provided with a circulation pump 52 and a hot water storage tank 53. The circulation pump 52 circulates water in the water circulation passage 51, and the circulating water is heated by heat exchange with the hot water supply refrigerant in the water heat exchanger 43. Then, the heated water is stored in the hot water storage tank 53. Although illustration is omitted, the hot water storage tank 53 is connected to a hot water supply pipe for supplying the stored hot water to an indoor hot water supply terminal (for example, a faucet provided in a kitchen or a bathroom).

  The expansion valve 44 expands the hot water supply refrigerant to make the hot water supply refrigerant at low temperature and low pressure. The outdoor heat exchanger 25 performs heat exchange between the hot water supply refrigerant expanded by the expansion valve 44 and outdoor air. As described above, the outdoor heat exchanger 25 is also used for heat exchange between the air conditioning refrigerant and the outdoor air. Therefore, the outdoor heat exchanger 25 is shared by both the air conditioning heat pump 11 and the hot water supply heat pump 12.

  A heat exchange channel 55 is connected between the water heat exchanger 43 and the expansion valve 44 in the annular channel 47. One end of the heat exchange channel 55 is connected to the annular channel 47 via the three-way valve 56, and the other end is connected to the annular channel 47 via the three-way valve 57. In this case, of the three-way valves 56, 57, the three-way valve 56 is disposed on the hydrothermal exchanger 43 side (in other words, the upstream side), and the three-way valve 57 is disposed on the expansion valve 44 side (in other words, the downstream side). Yes.

  The heat exchanger flow path 55 is provided with the above-described refrigerant heat exchanger 35. In the inter-refrigerant heat exchanger 35, heat exchange is performed between the hot water supply refrigerant flowing through the heat exchange channel 55 and the air conditioning refrigerant flowing through the heat exchange channel 31.

  The heat exchange channel 55 is connected to a channel portion between the outdoor heat exchanger 25 and the compressor 42 in the annular channel 47 via connection channels 58 and 59. Among the connection flow paths 58 and 59, the first connection flow path 58 has one end connected to the downstream side of the inter-refrigerant heat exchanger 35 in the heat exchange flow path 55 via the three-way valve 61, and the other end. The part is connected to the flow path portion of the annular flow path 47 via the three-way valve 62. One end of the second connection flow path 59 is connected to the upstream side of the inter-refrigerant heat exchanger 35 in the heat exchange flow path 55 via the three-way valve 63, and the other end is connected to the annular flow via the three-way valve 64. It is connected to the flow path portion of the path 47. In this case, among the three-way valves 62 and 64, the three-way valve 62 is disposed on the compressor 42 side, and the three-way valve 64 is disposed on the outdoor heat exchanger 25 side in the channel portion of the annular channel 47. .

  The above is the description regarding the configuration of the heat pump system 10. Although illustration is omitted, the heat pump system 10 is provided with a control device that performs various controls of the heat pump 11 for air conditioning and the heat pump 12 for hot water supply. The control device includes a known microcomputer having a CPU and the like, and is provided in the outdoor unit 14, for example. By this control device, the compressor 22, the three-way valves 32, 33 and the four-way valve 28 of the air conditioning heat pump 11 are controlled, and the compressor 42 and the three-way valves 56, 57, 61 to 64 of the hot water supply heat pump 12 are controlled. It has come to be.

  Next, the operation of the heat pump system 10 will be described. The heat pump system 10 has a cooling single operation mode, a heating single operation mode, a hot water supply single operation mode, a cooling hot water supply operation mode, and a heating hot water supply operation mode as its operation modes. Hereinafter, the operation of the heat pump system 10 will be described for each of these operation modes.

  First, the operation of the heat pump system 10 in the cooling only operation mode will be described with reference to FIG. FIG. 2 is a diagram illustrating a refrigerant flow when the heat pump system 10 is operated in the cooling single operation mode.

  The cooling only operation mode is executed when the cooling operation by the air conditioning heat pump 11 is performed in a state where the water heating operation (water heating operation) by the hot water supply heat pump 12 is stopped (that is, during the cooling only operation). In the cooling single operation mode, the compressor 22 of the heat pump 11 for air conditioning is driven by the control device. In the cooling single operation mode, the four-way valve 28 and the three-way valves 32 are arranged so that the air-conditioning refrigerant in the air-conditioning refrigerant circuit 21 circulates in the refrigerant circulation channel R1 for that mode (the channel indicated by a thick line in FIG. 2). , 33 is used to switch the flow path. The refrigerant circulation channel R1 corresponds to a third air conditioning circulation channel.

  Further, in FIG. 2, for convenience, a passage opened in the four-way valve 28 is indicated by a solid line, and a port opened in the three-way valves 32 and 33 is indicated by black. 3 to 10 described later, similarly, the open passage of the four-way valve is indicated by a solid line, and the open port of the three-way valve is indicated by black.

  As shown in FIG. 2, in the cooling single operation mode, in the air conditioning heat pump 11, the air conditioning refrigerant (gas refrigerant) that has been compressed by the compressor 22 to become high temperature and pressure passes through the four-way valve 28 and the three-way valve 32. And flows into the outdoor heat exchanger 25. In the outdoor heat exchanger 25, the air-conditioning refrigerant is cooled and condensed by heat exchange with outdoor air. In this case, the outdoor heat exchanger 25 functions as a condenser. The air-conditioning refrigerant condensed in the outdoor heat exchanger 25 flows into the expansion valve 24 via the three-way valve 33, and is decompressed at the expansion valve 24 to become a low temperature and a low pressure.

  The air-conditioning refrigerant decompressed by the expansion valve 24 flows into the indoor heat exchanger 23, where it is heated and evaporated (vaporized) by heat exchange with indoor air. In this case, the indoor heat exchanger 23 functions as an evaporator. The room air is cooled by heat exchange with the air conditioning refrigerant, and the indoor air is cooled by the cooled room air. The evaporated air-conditioning refrigerant returns to the compressor 22 again via the four-way valve 28.

  Next, the operation of the heat pump system 10 in the heating single operation mode will be described with reference to FIG. FIG. 3 is a diagram illustrating a refrigerant flow in the heating single operation mode.

  The heating single operation mode is executed when the heating operation by the air conditioning heat pump 11 is performed in a state where the water heating operation by the hot water supply heat pump 12 is stopped (that is, during the heating single operation). In the heating single operation mode, the compressor 22 of the heat pump 11 for air conditioning is driven by the control device. In the heating independent operation mode, the four-way valve 28 and the three-way valves 32 are arranged so that the air-conditioning refrigerant circulates in the refrigerant circulation channel R2 for the mode (the channel indicated by a bold line in FIG. 3) in the air-conditioning refrigerant circuit 21. , 33 is used to switch the flow path. The refrigerant circulation channel R2 corresponds to a third air conditioning circulation channel.

  As shown in FIG. 3, in the heating single operation mode, in the air conditioning heat pump 11, the air conditioning refrigerant (gas refrigerant) that has been compressed by the compressor 22 to a high temperature and high pressure passes through the four-way valve 28 and is an indoor heat exchanger. 23. In the indoor heat exchanger 23, the air conditioning refrigerant is cooled and condensed by heat exchange with room air. In this case, the indoor heat exchanger 23 functions as a condenser. The room air is heated by heat exchange with the air-conditioning refrigerant, and the room is heated by the heated room air.

  The air-conditioning refrigerant cooled by the indoor heat exchanger 23 flows into the expansion valve 24 and is decompressed at the expansion valve 24 to become a low temperature and a low pressure. The air conditioning refrigerant decompressed by the expansion valve 24 flows into the outdoor heat exchanger 25 via the three-way valve 33. In the outdoor heat exchanger 25, the air-conditioning refrigerant is heated and evaporated (vaporized) by heat exchange with outdoor air. In this case, the outdoor heat exchanger 25 functions as an evaporator. The air conditioning refrigerant evaporated in the outdoor heat exchanger 25 returns to the compressor 22 again via the three-way valve 32 and the four-way valve 28.

  Next, the operation of the heat pump system 10 in the hot water supply single operation mode will be described with reference to FIG. FIG. 4 is a diagram showing a refrigerant flow in the hot water supply single operation mode.

  In the hot water supply single operation mode, when the air heating operation (cooling operation and heating operation) by the air conditioning heat pump 11 is stopped, the water heating operation (water heating operation) by the hot water supply heat pump 12 is performed (that is, during the hot water supply single operation). To be executed. In the hot water supply single operation mode, the compressor 42 and the circulation pump 52 of the hot water supply heat pump 12 are driven by the control device. In the hot water supply single operation mode, the three-way valves 56, 57, 61 are arranged so that the hot water supply refrigerant circulates in the hot water supply refrigerant circuit 41 through the refrigerant circulation flow path L 1 for the mode (the flow path shown by a bold line in FIG. 4). The flow path switching by ~ 64 is performed. The refrigerant circulation channel L1 corresponds to the third hot water supply circulation channel.

  As shown in FIG. 4, in the hot water supply single operation mode, in the hot water supply heat pump 12, hot water supply refrigerant (gas refrigerant) that has been compressed by the compressor 42 to become high temperature and high pressure flows into the water heat exchanger 43. In the water heat exchanger 43, the hot water supply refrigerant is cooled and condensed by heat exchange with water circulating in the water circulation passage 51. Further, the water in the water circulation channel 51 is heated by heat exchange with the hot water supply refrigerant, and the heated water is stored in the hot water storage tank 53.

  The hot water supply refrigerant condensed in the water heat exchanger 43 flows into the expansion valve 44 via the three-way valves 56 and 57. In the expansion valve 44, the hot water supply refrigerant is depressurized to a low temperature and low pressure state. The hot water supply refrigerant decompressed by the expansion valve 44 flows into the outdoor heat exchanger 25, where it is heated and evaporated (vaporized) by heat exchange with outdoor air. The evaporated hot water supply refrigerant returns to the compressor 42 via the three-way valves 62 and 64 again.

  Next, the operation of the heat pump system 10 in the cooling hot water supply operation mode will be described with reference to FIG. FIG. 5 is a diagram showing a refrigerant flow in the cooling hot water supply operation mode.

  The cooling hot water supply operation mode is executed when the cooling operation by the air conditioning heat pump 11 and the water heating operation by the hot water supply heat pump 12 are performed simultaneously (that is, during the cooling hot water supply operation). In the cooling hot water supply operation mode, the compressors 22 and 42 of the heat pumps 11 and 12 and the circulation pump 52 are driven by the control device. In the cooling hot water supply operation mode, the four-way valve 28 and each three-way valve 32 are arranged so that the air-conditioning refrigerant in the air-conditioning refrigerant circuit 21 circulates through the refrigerant circulation channel R3 for that mode (the channel indicated by a thick line in FIG. 5). , 33 and the three-way valves 56, 56 so that the hot water supply refrigerant is circulated in the hot water supply refrigerant circuit 41 through the refrigerant circulation flow path L2 for the mode (the flow line shown by a bold line in FIG. 5). The flow path is switched by 57, 61 to 64. In this case, the refrigerant circulation channel R3 corresponds to the first air conditioning circulation channel, and the refrigerant circulation channel L2 corresponds to the first hot water supply circulation channel.

  As shown in FIG. 5, in the cooling hot water supply operation mode, in the air conditioning heat pump 11, the air conditioning refrigerant (gas refrigerant) that has been compressed by the compressor 22 to become high temperature and pressure passes through the four-way valve 28 and the three-way valve 32. And flows into the inter-refrigerant heat exchanger 35. In the inter-refrigerant heat exchanger 35, the air conditioning refrigerant is cooled and condensed by heat exchange with the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 41 (refrigerant circulation passage L2). In this case, the inter-refrigerant heat exchanger 35 functions as a condenser of the air conditioning heat pump 11. The inter-refrigerant heat exchanger 35 corresponds to the first heat exchange means.

  The air-conditioning refrigerant condensed in the inter-refrigerant heat exchanger 35 flows into the expansion valve 24 via the three-way valve 33, and is decompressed by the expansion valve 24 to become low temperature and low pressure. The decompressed air-conditioning refrigerant flows into the indoor heat exchanger 23 and is heated and evaporated by heat exchange with the indoor air in the indoor heat exchanger 23. In this case, the indoor heat exchanger 23 functions as an evaporator. The room air is cooled by heat exchange with the air conditioning refrigerant, and the indoor air is cooled by the cooled room air. The evaporated air-conditioning refrigerant returns to the compressor 22 again via the four-way valve 28.

  On the other hand, in the hot water supply heat pump 12, the hot water supply refrigerant (gas refrigerant) that has been compressed by the compressor 42 to a high temperature and high pressure flows into the water heat exchanger 43, and the water heat exchanger 43 passes through the water circulation channel 51. It is cooled and condensed by heat exchange with flowing water. Further, the water in the water circulation channel 51 is heated by heat exchange with the hot water supply refrigerant, and the heated water is stored in the hot water storage tank 53.

  The hot water supply refrigerant condensed in the water heat exchanger 43 flows into the expansion valve 44 via the three-way valves 56 and 57. In the expansion valve 44, the hot water supply refrigerant is decompressed to a low temperature and low pressure, and the decompressed hot water supply refrigerant flows into the outdoor heat exchanger 25. In the outdoor heat exchanger 25, the hot water supply refrigerant is heated and evaporated by heat exchange with the outdoor air. In this case, the outdoor heat exchanger 25 corresponds to an outdoor heat exchanger for hot water supply.

  The evaporated hot water supply refrigerant flows into the inter-refrigerant heat exchanger 35 via the three-way valves 63 and 64 and the second connection channel 59. In the inter-refrigerant heat exchanger 35, the hot water supply refrigerant is heated by heat exchange with the air conditioning refrigerant flowing in the refrigerant circulation channel R3 (specifically, the heat exchange channel 31). Specifically, the hot water supply refrigerant is heated by the high-temperature air-conditioning refrigerant discharged from the compressor 22. In other words, in this case, the heat exchange releases the heat of the air conditioning refrigerant to the hot water supply refrigerant, and the released heat is recovered (absorbed) by the hot water supply refrigerant.

  As described above, the hot water supply refrigerant is heated by the outdoor heat exchanger 25 and the inter-refrigerant heat exchanger 35, respectively. In this case, all of the hot water supply refrigerant may be evaporated in the outdoor heat exchanger 25, or may be evaporated in each of the outdoor heat exchanger 25 and the inter-refrigerant heat exchanger 35. The hot water supply refrigerant heated by the inter-refrigerant heat exchanger 35 returns to the compressor 42 again via the three-way valves 61 and 62 and the first connection flow path 58.

  Next, the operation of the heat pump system 10 in the heating / hot water supply operation mode will be described with reference to FIG. FIG. 6 is a diagram showing a refrigerant flow in the heating hot water supply operation mode.

  The heating and hot water supply operation mode is executed when the heating operation by the air conditioning heat pump 11 and the water heating operation by the hot water supply heat pump 12 are performed simultaneously (that is, during the heating and hot water supply operation). In the heating and hot water supply operation mode, the compressors 22 and 42 of the heat pumps 11 and 12 and the circulation pump 52 are driven by the control device. Further, in the heating and hot water supply operation mode, the four-way valve 28 and the three-way valves 32 are arranged so that the air-conditioning refrigerant in the air-conditioning refrigerant circuit 21 circulates through the refrigerant circulation channel R4 for that mode (the channel indicated by a thick line in FIG. 6). , 33 and the three-way valves 56, 56 so that the hot water supply refrigerant circulates in the refrigerant circulation flow path L3 for the mode (the flow path shown by a bold line in FIG. 6) in the hot water supply refrigerant circuit 41. The flow path is switched by 57, 61 to 64. In this case, the refrigerant circulation channel R4 corresponds to the second air conditioning circulation channel, and the refrigerant circulation channel L3 corresponds to the second hot water supply circulation channel.

  As shown in FIG. 6, in the heating and hot water supply operation mode, in the air conditioning heat pump 11, the air conditioning refrigerant (gas refrigerant) that has been compressed by the compressor 22 to become high temperature and high pressure passes through the four-way valve 28 and is an indoor heat exchanger. 23. In the indoor heat exchanger 23, the air conditioning refrigerant is cooled and condensed by heat exchange with room air. In this case, the indoor heat exchanger 23 functions as a condenser. The room air is heated by heat exchange with the air-conditioning refrigerant, and the room is heated by the heated room air.

  The air-conditioning refrigerant heated by the indoor heat exchanger 23 flows into the expansion valve 24, where it is depressurized and becomes low temperature and low pressure. The air-conditioning refrigerant decompressed by the expansion valve 24 flows into the inter-refrigerant heat exchanger 35 via the three-way valve 33. In the inter-refrigerant heat exchanger 35, the air conditioning refrigerant is heated and evaporated by heat exchange with the hot water supply refrigerant flowing in the hot water supply refrigerant circuit 41 (refrigerant circulation channel L3). In this case, the inter-refrigerant heat exchanger 35 functions as an evaporator of the air conditioning heat pump 11. The inter-refrigerant heat exchanger 35 corresponds to the second heat exchange means. The air-conditioning refrigerant evaporated in the inter-refrigerant heat exchanger 35 returns to the compressor 22 again via the three-way valve 32 and the four-way valve 28.

  On the other hand, in the hot water supply heat pump 12, the hot water supply refrigerant (gas refrigerant) that has been compressed by the compressor 42 to a high temperature and high pressure flows into the water heat exchanger 43, and the water heat exchanger 43 passes through the water circulation channel 51. It is cooled and condensed by heat exchange with flowing water. Further, the water in the water circulation channel 51 is heated by heat exchange with the hot water supply refrigerant, and the heated water is stored in the hot water storage tank 53.

  The hot water supply refrigerant condensed in the water heat exchanger 43 flows into the inter-refrigerant heat exchanger 35 via the three-way valves 56 and 63. In the inter-refrigerant heat exchanger 35, the hot water supply refrigerant is cooled by heat exchange with the air conditioning refrigerant flowing in the refrigerant circulation channel R4 (specifically, the heat exchange channel 31). In this case, the hot water supply refrigerant releases residual heat (exhaust heat) after heat exchange with water in the water heat exchanger 43 to the air conditioning refrigerant by the heat exchange. The released heat is recovered (absorbed) by the air conditioning refrigerant.

  The hot water supply refrigerant cooled by the inter-refrigerant heat exchanger 35 flows into the expansion valve 44 via the three-way valves 57 and 61. In the expansion valve 44, the hot water supply refrigerant is decompressed to a low temperature and low pressure, and the decompressed hot water supply refrigerant flows into the outdoor heat exchanger 25. In the outdoor heat exchanger 25, the hot water supply refrigerant is heated and evaporated by heat exchange with the outdoor air. The evaporated hot water supply refrigerant returns to the compressor 42 via the three-way valves 62 and 64 again.

  As mentioned above, according to the structure of this embodiment explained in full detail, the following outstanding effects are acquired.

  During the cooling and hot water supply operation, the refrigerant for air conditioning is circulated in the refrigerant circulation flow path R3 and the refrigerant for hot water supply is circulated in the refrigerant circulation flow path L2, so that each of the refrigerants exchanges heat with the heat exchanger 35 between the refrigerants. did. Then, heat of the air conditioning refrigerant is released to the hot water supply refrigerant by the heat exchange. In this case, since the exhaust heat of the air conditioning refrigerant can be recovered in the hot water supply heat pump 12, the load of the hot water supply heat pump 12 can be reduced using the exhaust heat.

  On the other hand, at the time of heating and hot water supply operation, the refrigerant for air conditioning is circulated through the refrigerant circulation channel R4 and the refrigerant for hot water supply is circulated through the refrigerant circulation channel L3, so that each of the refrigerants exchanges heat with the heat exchanger 35 between the refrigerants. I did it. And the heat of the hot water supply refrigerant is released to the air conditioning refrigerant by the heat exchange. In this case, since the exhaust heat of the hot water supply refrigerant can be recovered in the air conditioning heat pump 11, the load of the air conditioning heat pump 11 can be reduced using the exhaust heat. Therefore, by using exhaust heat in both the air conditioning heat pump 11 and the hot water supply heat pump 12 as described above, it is possible to reduce the load in each of the heat pumps 11 and 12.

  In the cooling hot water supply operation, the inter-refrigerant heat exchanger 35 exchanges heat between the high-temperature air-conditioning refrigerant discharged from the compressor 22 and the hot-water supply refrigerant, so that the hot-water supply heat pump 12 is in a high-temperature state. It is possible to recover the exhaust heat. Thereby, the load reduction of the heat pump 12 for hot water supply can be aimed at suitably.

  During the heating and hot water supply operation, the inter-refrigerant heat exchanger 35 exchanges heat between the hot water supply refrigerant and the air conditioning refrigerant after passing through the water heat exchanger 43. In this case, since the heat (residual heat) of the hot water supply refrigerant after heat exchange with water in the water heat exchanger 43 is recovered by the air conditioning heat pump 11, the water heating capacity in the water heat exchanger 43 It is possible to reduce the load on the air conditioning heat pump 11 without reducing the temperature.

  A heat exchanger (first heat exchange means) that exchanges heat between the air conditioning refrigerant and the hot water supply refrigerant during the cooling hot water supply operation, and heat exchange between the air conditioning refrigerant and the hot water supply refrigerant during the heating hot water operation. A common inter-refrigerant heat exchanger 35 was used for the heat exchanger (second heat exchange means) to be performed. In this case, since the number of heat exchangers can be reduced, the configuration can be simplified and the outdoor unit 14 can be made compact.

  The air conditioning refrigerant is circulated through the refrigerant circulation channel R1 during the cooling single operation, and the air conditioning refrigerant is circulated through the refrigerant circulation channel R2 during the heating single operation, so that the air conditioning refrigerant and the heating single operation (that is, the air conditioning single operation). The air conditioning refrigerant is circulated through the outdoor heat exchanger 25 without passing through the inter-refrigerant heat exchanger 35. Thereby, at the time of air-conditioning independent operation, the outdoor heat exchanger 25 can be used as a condenser or an evaporator of the air-conditioning refrigerant instead of the inter-refrigerant heat exchanger 35. For this reason, it is possible to avoid that the air-conditioning refrigerant is not sufficiently condensed or evaporated during the air-conditioning independent operation and the efficiency of the air-conditioning heat pump 11 is reduced.

  Since the outdoor heat exchanger of the hot water supply heat pump 12 is shared with the outdoor heat exchanger of the air conditioning heat pump 11, the number of the outdoor heat exchangers 25 can be reduced. Thereby, simplification of a structure, size reduction of the outdoor unit 14, etc. can be achieved.

  Further, in such a configuration, at the time of cooling hot water supply operation and heating hot water supply operation, the air conditioning refrigerant is circulated not through the outdoor heat exchanger 25 but through the inter-refrigerant heat exchanger 35. During the heating and hot water supply operation, the outdoor heat exchanger 25 can distribute only the hot water supply refrigerant out of the air conditioning refrigerant and the hot water supply refrigerant. For this reason, the outdoor heat exchanger of the hot water supply heat pump 12 is shared with the outdoor heat exchanger of the air conditioning heat pump 11, and the heat between the hot water supply refrigerant and the outdoor air during the cooling hot water supply operation and the heating hot water supply operation. A reduction in exchange efficiency can be avoided.

  During the hot water supply single operation, the hot water supply refrigerant is circulated in the refrigerant circulation flow path L1 so as not to pass through the inter-refrigerant heat exchanger 35. In this case, the efficiency of the hot water supply heat pump 12 is reduced by circulating the hot water supply refrigerant to the inter-refrigerant heat exchanger 35 even though the operation of the air conditioning heat pump 11 is stopped and the air conditioning refrigerant is not circulating. Can be avoided.

  During the cooling hot water supply operation, the hot water supply refrigerant is circulated through the outdoor heat exchanger 25 in addition to the inter-refrigerant heat exchanger 35 in the refrigerant circulation passage L2. In this case, the hot water supply refrigerant absorbs (recovers) heat from the air conditioning refrigerant in the inter-refrigerant heat exchanger 35 and also absorbs heat from the outdoor air in the outdoor heat exchanger 25. For this reason, the efficiency of the hot water supply heat pump 12 can be further improved during the cooling hot water supply operation.

[Second Embodiment]
In the first embodiment, a heat exchanger (corresponding to the first heat exchanging means) that performs heat exchange between the air conditioning refrigerant and the hot water supply refrigerant during the cooling hot water supply operation, and the air conditioning refrigerant and the hot water supply during the heating hot water supply operation. Although the same inter-refrigerant heat exchanger 35 is used as a heat exchanger for performing heat exchange with the refrigerant (corresponding to the second heat exchanging means), the heat exchanger is shared. A heat exchanger (corresponding to the first heat exchanging means) that exchanges heat between the refrigerants during operation and a heat exchanger (corresponding to the second heat exchanging means) that exchanges heat between the refrigerants during heating hot water supply operation Are provided individually. Below, the heat pump system of this embodiment is demonstrated based on FIG. In addition, FIG. 7 is a figure which shows the structure of the heat pump system in this embodiment.

  As shown in FIG. 7, the heat pump system 70 of this embodiment includes an air conditioning heat pump 71 and a hot water supply heat pump 72. The air conditioning heat pump 71 has an air conditioning refrigerant circuit 74, and the compressor 22, the indoor heat exchanger 23, the expansion valve 24, and the outdoor heat are disposed in an annular flow path 75 (see a thick line in FIG. 7) of the air conditioning refrigerant circuit 74. An exchanger 25 is provided. Heat exchange channels 76 and 77 are connected to the annular channel 75. One end of each of the heat exchange channels 76 and 77 is connected between the compressor 22 and the outdoor heat exchanger 25 in the annular channel 75 via three-way valves 78 and 79, and the other end. Is connected between the expansion valve 24 and the outdoor heat exchanger 25 in the annular flow path 75 via the three-way valves 81 and 82. Further, the heat exchangers 83 and 84 are provided in the heat exchange channels 76 and 77, respectively.

  On the other hand, the hot water supply heat pump 72 has a hot water supply refrigerant circuit 86, and the compressor 42, the water heat exchanger 43, and the expansion valve 44 are disposed in an annular flow path 87 (see a thick line in FIG. 8) of the hot water supply refrigerant circuit 86. And an outdoor heat exchanger 25 is provided. Heat exchange channels 88 and 89 are connected to the annular channel 87. Both ends of the heat exchange channel 88 are connected between the compressor 42 and the outdoor heat exchanger 25 in the annular channel 87 via the three-way valves 91 and 92. Further, both ends of the heat exchange channel 89 are connected between the expansion valve 44 and the water heat exchanger 43 in the annular channel 87 via three-way valves 93 and 94. The heat exchangers 83 and 84 are provided in the heat exchange channels 88 and 89, respectively.

  Next, the operation of the heat pump system 70 will be described. First, the operation of the heat pump system 70 in the cooling single operation mode will be described with reference to FIG. FIG. 7 shows the refrigerant flow in the cooling single operation mode.

  As shown in FIG. 7, in the air conditioning heat pump 71, in the air conditioning heat pump 71, the air conditioning refrigerant circulates through the mode refrigerant circulation channel R <b> 11 (the channel indicated by the thick line in FIG. 7) in the air conditioning refrigerant circuit 74. To do. The air-conditioning refrigerant circulates in the refrigerant circulation passage R11 in the order of the compressor 22 → the outdoor heat exchanger 25 → the expansion valve 24 → the indoor heat exchanger 23 → the compressor 22. In this case, the indoor air is cooled and the indoor air is cooled by heat exchange between the air conditioning refrigerant and the indoor air in the indoor heat exchanger 23. The refrigerant circulation channel R11 corresponds to the third air conditioning circulation channel.

  Then, heating independent operation mode is demonstrated. Although illustration is omitted, in the heating single operation mode, the air-conditioning refrigerant circulates through the refrigerant circulation passage for the mode. This refrigerant circulation channel is a channel in which the flow direction of the air-conditioning refrigerant is opposite to that of the refrigerant circulation channel R11 during cooling only operation. In the heating single operation mode, the air-conditioning refrigerant circulates through the refrigerant circulation passage in the order of the compressor 22 → the indoor heat exchanger 23 → the expansion valve 24 → the outdoor heat exchanger 25 → the compressor 22. In this case, in the indoor heat exchanger 23, the indoor air is heated and the room is heated by heat exchange between the air-conditioning refrigerant and the room air. In this case, the refrigerant circulation channel corresponds to the third air conditioning circulation channel.

  Next, the hot water supply single operation mode will be described with reference to FIG. FIG. 8 shows the flow of the refrigerant in the hot water supply single operation mode.

  As shown in FIG. 8, in the hot water supply independent operation mode, in the hot water supply heat pump 72, the hot water supply refrigerant circulates in the refrigerant circulation passage L <b> 11 for the mode in the hot water supply refrigerant circuit 86 (the flow path indicated by a bold line in FIG. 8). To do. The hot water supply refrigerant circulates in the refrigerant circulation passage L11 in the order of the compressor 42 → the water heat exchanger 43 → the expansion valve 44 → the outdoor heat exchanger 25 → the compressor 42. In this case, the water heat exchanger 43 exchanges heat between the hot water supply refrigerant and the water in the water circulation passage 51, and the water is heated by the heat exchange. The refrigerant circulation channel L11 corresponds to a third hot water supply circulation channel.

  Next, the cooling hot water supply operation mode will be described with reference to FIG. FIG. 9 shows the refrigerant flow in the cooling hot water supply operation mode.

  As shown in FIG. 9, in the cooling hot water supply operation mode, in the air conditioning heat pump 71, the air conditioning refrigerant circulates through the refrigerant circulation channel R <b> 12 for the mode in the air conditioning refrigerant circuit 74 (the channel indicated by a bold line in FIG. 9). To do. The air-conditioning refrigerant circulates in the refrigerant circulation passage R12 in the order of the compressor 22 → the inter-refrigerant heat exchanger 83 → the expansion valve 24 → the indoor heat exchanger 23 → the compressor 22. In this case, the indoor air is cooled and the indoor air is cooled by heat exchange between the air conditioning refrigerant and the indoor air in the indoor heat exchanger 23. In the inter-refrigerant heat exchanger 83, heat exchange is performed between the air-conditioning refrigerant and the hot water supply refrigerant circuit 86 (specifically, a heat exchange flow path 88 in the refrigerant circulation flow path L <b> 12 described later). The air conditioning refrigerant is cooled and condensed by the heat exchange. The refrigerant circulation channel R12 corresponds to the first air conditioning circulation channel.

  On the other hand, in the hot water supply heat pump 72, the hot water supply refrigerant circulates in the refrigerant circulation channel L12 for the mode in the hot water supply refrigerant circuit 86 (a channel indicated by a thick line in FIG. 9). The hot water supply refrigerant circulates through the refrigerant circulation passage L12 in the order of the compressor 42 → the water heat exchanger 43 → the expansion valve 44 → the outdoor heat exchanger 25 → the inter-refrigerant heat exchanger 83 → the compressor 42. In this case, in the water heat exchanger 43, the water is heated by heat exchange between the hot water supply refrigerant and the water in the water circulation passage 51. In the inter-refrigerant heat exchanger 83, the hot water supply refrigerant is heated by heat exchange with the air conditioning refrigerant flowing in the refrigerant circulation channel R12 (specifically, the heat exchange channel 76). In other words, in this case, heat of the air conditioning refrigerant is released to the hot water supply refrigerant by the heat exchange, and the released heat is recovered (absorbed) by the hot water supply refrigerant. In this case, the inter-refrigerant heat exchanger 83 corresponds to the first heat exchange means. The refrigerant circulation channel L12 corresponds to the first hot water supply circulation channel.

  Next, the heating and hot water supply operation mode will be described with reference to FIG. FIG. 10 shows the flow of the refrigerant in the heating hot water supply operation mode.

  As shown in FIG. 10, in the heating and hot water supply operation mode, in the air conditioning heat pump 71, the air conditioning refrigerant circulates through the refrigerant circulation channel R <b> 13 for the mode in the air conditioning refrigerant circuit 74 (the channel indicated by a thick line in FIG. 10). To do. The air-conditioning refrigerant circulates in the refrigerant circulation passage R13 in the order of the compressor 22 → the indoor heat exchanger 23 → the expansion valve 24 → the inter-refrigerant heat exchanger 84 → the compressor 22. In this case, in the indoor heat exchanger 23, the indoor air is heated and the room is heated by heat exchange between the air-conditioning refrigerant and the room air. Further, in the inter-refrigerant heat exchanger 84, heat exchange is performed between the air-conditioning refrigerant and the hot water supply refrigerant circuit 86 (more specifically, the heat exchange flow path 89 in the refrigerant circulation flow path L13 described later). The air conditioning refrigerant is heated and evaporated by the heat exchange. The refrigerant circulation channel R13 corresponds to the second air conditioning circulation channel.

  On the other hand, in the hot water supply heat pump 72, the hot water supply refrigerant circulates in the refrigerant circulation channel L13 for the mode in the hot water supply refrigerant circuit 86 (a channel indicated by a thick line in FIG. 10). The hot water supply refrigerant circulates through the refrigerant circulation passage L13 in the order of the compressor 42 → the water heat exchanger 43 → the inter-refrigerant heat exchanger 84 → the expansion valve 44 → the outdoor heat exchanger 25 → the compressor 42. In this case, in the water heat exchanger 43, the water is heated by heat exchange between the hot water supply refrigerant and the water in the water circulation passage 51. In the inter-refrigerant heat exchanger 84, the hot water supply refrigerant is cooled by heat exchange with the air conditioning refrigerant flowing in the refrigerant circulation passage R13 (specifically, the heat exchange passage 77). In other words, in this case, heat of the hot water supply refrigerant is released to the air conditioning refrigerant by the heat exchange, and the released heat is recovered (absorbed) by the air conditioning refrigerant. In this case, the inter-refrigerant heat exchanger 84 corresponds to the second heat exchange means. The refrigerant circulation channel L13 corresponds to the second hot water supply circulation channel.

  As mentioned above, according to the structure of this embodiment explained in full detail, the effect similar to the effect in the said 1st Embodiment can be acquired. That is, at the time of cooling hot water supply operation, the refrigerant for air conditioning is circulated in the refrigerant circulation flow path R12 and the refrigerant for hot water supply is circulated in the refrigerant circulation flow path L12, so that each refrigerant is heat-exchanged by the inter-refrigerant heat exchanger 83. Since the heat exchange causes the heat of the air conditioning refrigerant to be released to the hot water supply refrigerant, the hot water supply heat pump 72 can recover the exhaust heat of the air conditioning refrigerant. As a result, the exhaust heat is used to supply hot water The load of the heat pump 72 can be reduced.

  Further, during the heating and hot water supply operation, the refrigerant for air conditioning is circulated in the refrigerant circulation passage R13 and the refrigerant for hot water supply is circulated in the refrigerant circulation passage L13, so that each of the refrigerants exchanges heat with the inter-refrigerant heat exchanger 84. Since the heat exchange causes the heat of the hot water supply refrigerant to be released to the air conditioning refrigerant, the exhaust heat of the hot water supply refrigerant can be recovered by the air conditioning heat pump 71, and as a result, the exhaust heat is used to perform air conditioning. The load of the heat pump 71 can be reduced. Therefore, by using exhaust heat in both the air conditioning heat pump 71 and the hot water supply heat pump 72, the load can be reduced in each of the heat pumps 71 and 72.

[Other Embodiments]
The present invention is not limited to the above embodiment, and may be implemented as follows, for example.

  In each of the above embodiments, during the heating and hot water supply operation, heat exchange between the hot water supply refrigerant and the air conditioning refrigerant after passing through the water heat exchanger 43 is performed in the inter-refrigerant heat exchangers 35 and 84. However, this is changed, for example, during the heating and hot water supply operation, in the heat exchanger between refrigerants (second heat exchange means), the hot water supply refrigerant and air conditioning before being discharged from the compressor 42 and flowing into the water heat exchanger 43. Heat exchange may be performed with the refrigerant for use. In this case, since heat exchange is performed between the high-temperature hot water supply refrigerant discharged from the compressor 42 and the air-conditioning refrigerant, exhaust heat recovery in a high-temperature state can be performed by the air-conditioning heat pump 11. Therefore, the load of the air conditioning heat pump 11 can be further reduced.

  However, in such a configuration, since the hot water supply refrigerant performs heat exchange with the air conditioning refrigerant, the water heat exchanger 43 performs heat exchange with water. There is a concern to do. Therefore, in view of this point, it is desirable to cause heat exchange between the hot water supply refrigerant and the air conditioning refrigerant after passing through the water heat exchanger 43 as in the above embodiments.

  In each of the embodiments described above, the air conditioning refrigerant is circulated through the refrigerant circulation channels R1 and R11 (corresponding to the third air conditioning circulation channel) via the outdoor heat exchanger 25 during the cooling only operation. Thus, the air-conditioning refrigerant may be circulated through the refrigerant circulation passages R3 and R12 for the cooling hot water supply operation via the inter-refrigerant heat exchangers 35 and 83 during the cooling only operation. In this case, you may provide the outdoor heat exchanger 25 in refrigerant | coolant circulation flow path R3, R12.

  In the above embodiment, the air conditioning refrigerant is circulated in the refrigerant circulation channel R2 (corresponding to the third air conditioning circulation channel) passing through the outdoor heat exchanger 25 during the heating single operation. Then, the air-conditioning refrigerant may be circulated through the refrigerant circulation passages R4 and R13 for the heating and hot water supply operation via the inter-refrigerant heat exchangers 35 and 84 during the heating-only operation. In this case, you may provide the outdoor heat exchanger 25 in refrigerant | coolant circulation flow path R4, R13.

  In the case of the above-described configuration, the refrigerant circulation channels R1 and R11 (R2) can be omitted, so that the configuration of the air conditioning refrigerant circuits 21 and 74 can be simplified correspondingly.

  In each of the above embodiments, the hot water supply refrigerant is circulated in the refrigerant circulation passages L1, L11 (corresponding to the third hot water supply circulation passage) that do not pass through the inter-refrigerant heat exchangers 35, 83, 84 in the hot water supply single operation. However, by changing this, the refrigerant circulation passages L2, L3 for the cooling hot water supply operation or the heating hot water supply operation using the hot water supply refrigerant via the inter-refrigerant heat exchangers 35, 83 in the hot water supply single operation. You may make it circulate to L12 and L13. In that case, it is not necessary to provide the refrigerant circulation channels L1 and L11, and accordingly, the configuration of the hot water supply refrigerant circuits 41 and 86 can be simplified.

  In each of the above embodiments, the hot water supply refrigerant is circulated through the outdoor heat exchanger 25 in addition to the inter-refrigerant heat exchangers 35 and 83 during the cooling hot water supply operation. You may circulate only through the heat exchangers 35 and 83. In other words, the refrigerant circulation passages L2 and L12 (first hot water circulation passage) for circulating the hot water supply refrigerant during the cooling hot water supply operation flow through the inter-refrigerant heat exchangers 35 and 83 and not through the outdoor heat exchanger 25. It may be a road.

  In each of the above-described embodiments, the outdoor heat exchanger 25 is shared by the air conditioning heat pumps 11 and 71 and the hot water supply heat pumps 12 and 72. However, the heat pumps 11 and 12 (71 and 72) are changed. ) May be provided individually for each outdoor heat exchanger.

  DESCRIPTION OF SYMBOLS 10 ... Heat pump system, 11 ... Heat pump for air conditioning, 12 ... Heat pump for hot water supply, 21 ... Refrigerant circuit for air conditioning, 22 ... Compressor as 1st compressor, 25 ... Outdoor heat exchanger as an outdoor heat exchanger for hot water supply, 35 ... Inter-refrigerant heat exchanger as first heat exchange means and second heat exchange means, 41 ... Refrigerant circuit for hot water supply, 42 ... Compressor as second compressor, 43 ... Water heat exchanger, 51 ... Water circulation flow , 70 ... heat pump system, 71 ... heat pump for air conditioning, 72 ... heat pump for hot water supply, 74 ... refrigerant circuit for air conditioning, 86 ... refrigerant circuit for hot water supply, 83 ... heat exchanger between refrigerants as first heat exchange means, 84 ... R2... Refrigerant circulation channel as a third air conditioning circulation channel, R2... Refrigerant circulation channel as a third air conditioning circulation channel, R3. Refrigerant as a way Ring flow path, R4 ... Refrigerant circulation path as second air conditioning circulation path, L1 ... Refrigerant circulation path as third hot water supply circulation path, L2 ... Refrigerant circulation path as first hot water circulation path, L3 ... Refrigerant circulation channel as second hot water supply circulation channel, R11... Refrigerant circulation channel as third air conditioning circulation channel, R12. Refrigerant circulation channel as first air conditioning circulation channel, R13. Refrigerant circulation channel as a channel, L11... Refrigerant circulation channel as a third hot water supply circulation channel, L12. Refrigerant circulation channel as a first hot water circulation channel, L13. Refrigerant circulation as a second hot water circulation channel. Flow path.

Claims (8)

An air conditioning heat pump that has an air conditioning refrigerant circuit for circulating the air conditioning refrigerant, and that heats and cools the room by heat exchange between the air conditioning refrigerant and room air;
A hot water supply heat pump that heats the water by heat exchange between the hot water supply refrigerant and the water circulating in the water circulation flow path, having a hot water supply refrigerant circuit for circulating the hot water supply refrigerant;
A heat pump system comprising:
The air-conditioning refrigerant circuit has a first air-conditioning circulation flow for circulating the air-conditioning refrigerant as a switchable flow path during a cooling hot-water supply operation in which a cooling operation of the air-conditioning heat pump and a water heating operation of the hot-water supply heat pump are performed simultaneously. A second air conditioning circulation channel for circulating the air conditioning refrigerant during a heating hot water supply operation in which a heating operation of the air conditioning heat pump and a water heating operation of the hot water supply heat pump are performed simultaneously,
The hot water supply refrigerant circuit has, as a switchable flow path, a first hot water supply circulation path for circulating the hot water supply refrigerant during the cooling hot water supply operation and a second hot water supply circulation for circulating the hot water supply refrigerant during the heating hot water supply operation. A flow path,
Heat exchange is performed between the air-conditioning refrigerant circulating in the first air-conditioning circulation channel and the hot-water supply refrigerant circulating in the first hot-water supply circulation channel, so that the heat of the air-conditioning refrigerant is transferred to the hot-water supply First heat exchanging means to be discharged to the refrigerant for use;
Heat exchange is performed between the air-conditioning refrigerant circulating in the second air-conditioning circulation channel and the hot-water supply refrigerant circulating in the second hot-water supply circulation channel, so that the heat of the hot-water supply refrigerant is air-conditioned. A heat pump system comprising: a second heat exchanging means for releasing the refrigerant into the industrial refrigerant. The air conditioning heat pump has a first compressor that compresses the air conditioning refrigerant,
The first heat exchanging means is configured to circulate the air-conditioning refrigerant discharged from the first compressor in the first air-conditioning circulation channel and the first hot-water supply circulation channel during the cooling hot-water supply operation. The heat pump system according to claim 1, wherein heat exchange is performed between the heat pump system and the heat pump system. The hot water supply heat pump performs heat exchange between a second compressor that compresses the hot water supply refrigerant, and the hot water supply refrigerant discharged from the second compressor and the water circulating in the water circulation passage. A water heat exchanger for heating the water;
The second heat exchange means circulates the hot water supply refrigerant after passing through the water heat exchanger in the second hot water supply circulation channel and the second air conditioning circulation channel in the heating hot water supply operation. The heat pump system according to claim 1, wherein heat exchange is performed with the refrigerant for use. The first heat exchange means and the second heat exchange means are constituted by a common heat exchanger,
4. The air conditioning circulation flow path and the hot water supply circulation flow path are both flow paths that pass through the common heat exchanger. 5. Heat pump system. The first heat exchanging means functions as a condenser of the heat pump for air conditioning during the cooling hot water supply operation.
The second heat exchange means functions as an evaporator of the air conditioning heat pump during the heating and hot water supply operation,
The air-conditioning refrigerant circuit serves as a switchable flow path for supplying the air-conditioning refrigerant during air-conditioning single operation in which the air-conditioning heat pump is cooled or heated while the water heating operation of the hot-water supply heat pump is stopped. A third air-conditioning circulation channel for circulation;
The air conditioning heat pump includes an outdoor heat exchanger that functions as a condenser or an evaporator by performing heat exchange between the air conditioning refrigerant and outdoor air,
5. The third air-conditioning circulation channel is a channel that passes through the outdoor heat exchanger without passing through the heat exchange means. 6. Heat pump system. The hot water supply heat pump uses the outdoor heat exchanger of the air conditioning heat pump as a heat exchanger for performing heat exchange between the hot water supply refrigerant and outdoor air,
Both the first air-conditioning circulation channel for circulating the air-conditioning refrigerant during the cooling and hot-water supply operation and the second air-conditioning circulation channel for circulating the air-conditioning refrigerant during the heating and hot-water supply operation are both used for the outdoor heat exchanger. The heat pump system according to claim 5, wherein the route is a route that does not pass through. The hot water supply refrigerant circuit uses the hot water supply refrigerant as a switchable flow path during a single hot water supply operation in which a water heating operation of the hot water supply heat pump is performed in a state where the cooling operation and the heating operation of the air conditioning heat pump are stopped. A third hot water supply circulation channel for circulation;
The heat pump system according to any one of claims 1 to 6, wherein the third hot water supply circulation channel is a channel that does not pass through each of the heat exchange means. The hot water supply heat pump includes a hot water supply outdoor heat exchanger that causes the hot water supply refrigerant to absorb heat of outdoor air by causing heat exchange between the hot water supply refrigerant and outdoor air,
The said 1st hot water supply circulation flow path is a flow path which goes through via the said hot water supply outdoor heat exchanger in addition to the said 1st heat exchange means. Heat pump system.

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