JP5801642B2 - Heat pump hot water supply system - Google Patents

Description

  The present invention relates to a heat pump hot water supply system including a heat pump circuit including a compressor, a first heat exchanger, an expansion valve, a second heat exchanger, and a hot water supply heat exchanger for heating hot water.

  The heat pump hot water supply system as described above drives a compressor and circulates a refrigerant in a heat pump circuit to perform an air conditioning operation such as a cooling operation or a heating operation, and also uses hot water used for hot water supply with a refrigerant in a hot water supply heat exchanger. The hot water supply operation which heats water can also be performed. Thereby, it is a system which can perform air conditioning and hot water supply, aiming at energy saving using the single heat source called the refrigerant | coolant of a heat pump circuit.

  In such a heat pump hot water supply system, air conditioning and hot water supply may be required at the same time, and even in such a case, it is required to satisfy both the requirements of air conditioning and hot water supply. Therefore, conventionally, an indoor heat exchanger is provided as the first heat exchanger, and an outdoor heat exchanger is provided as the second heat exchanger. In addition to the single operation of the cooling operation, the heating operation, and the hot water supply operation, There is one that performs a cooling / hot water supply simultaneous operation in which an operation and a hot water supply operation are performed simultaneously, and a heating / hot water supply simultaneous operation in which a heating operation and a hot water supply operation are performed simultaneously (see, for example, Patent Document 1). In the system described in Patent Document 1, the circulation state of the refrigerant in the heat pump circuit passes through the compressor, the hot water supply heat exchanger, the outdoor heat exchanger, or does not pass through the outdoor heat exchanger. It is possible to switch between a cooling / hot water circulation state in which the refrigerant is circulated in the order of the heater and a heating / hot water circulation state in which the refrigerant is circulated in the order of the compressor, the hot water heat exchanger, the indoor heat exchanger, the expansion valve, and the outdoor heat exchanger. It is configured. In the simultaneous cooling and hot water supply operation, the refrigerant circulation state in the heat pump circuit is switched to the cooling and hot water supply circulation state, and in the simultaneous heating and hot water supply operation, the refrigerant circulation state in the heat pump circuit is switched to the heating and hot water supply circulation state.

JP 2005-106360 A

  In the system described in Patent Document 1, when heating and hot water supply are requested at the same time, the refrigerant circulation state in the heat pump circuit is changed to a compressor, a hot water heat exchanger, an indoor heat exchanger, an expansion valve, and outdoor heat. By switching to the heating and hot water supply circulation state in which the refrigerant is circulated in the order of the exchanger, and simultaneously performing the heating and hot water supply operation, it is intended to meet the user's request to perform both heating and hot water supply simultaneously. . However, in the system described in Patent Document 1, when performing heating and hot water supply simultaneous operation, the heating load cannot be covered, or if the heating load is covered, the hot water cannot be supplied and the user's request can be satisfied. There was a problem that it was impossible.

This problem will be described.
In the heating / hot water supply operation, the refrigerant circulation state in the heat pump circuit is switched to the heating / hot water circulation state, and the refrigerant is circulated in the order of the compressor, hot water heat exchanger, indoor heat exchanger, expansion valve, and outdoor heat exchanger. Let Therefore, the hot water supply heat exchanger is always supplied with the refrigerant, and the indoor heat exchanger is supplied with the refrigerant whose temperature is lowered by heating the hot water with the hot water supply heat exchanger. Therefore, due to the temperature drop of the refrigerant supplied to the indoor heat exchanger, the air supplied to the room cannot be heated sufficiently and the required heating load cannot be covered. Moreover, in the system described in Patent Document 1, the flow rate of hot water supplied to the hot water supply heat exchanger is adjusted according to the required hot water supply load in the heating / hot water supply operation, so the hot water supply load increases. When the flow rate of hot water supplied to the hot water supply heat exchanger is increased, the temperature of the refrigerant supplied to the indoor heat exchanger further decreases, and there is a possibility that heating itself cannot be performed. Conversely, if the hot water supply water supply to the hot water supply heat exchanger is stopped to cover the heating load, the hot water supply heat exchanger cannot heat the hot water supply water and the hot water supply cannot be performed.

  The present invention has been made paying attention to such points, and its purpose is not only to perform both cooling and hot water supply at the same time, but also to perform both heating and hot water supply at the same time. It is in providing a heat pump hot-water supply system that can meet the user's request to perform both of them simultaneously.

In order to achieve this object, the characteristic configuration of the heat pump hot water supply system according to the present invention includes a compressor, a first heat exchanger, an expansion valve, a second heat exchanger, and a hot water supply heat exchanger that heats hot water supply water. In a heat pump hot water supply system comprising a configured heat pump circuit,
Regarding the circulation state of the refrigerant in the heat pump circuit, a cooling / hot water circulation state in which refrigerant is circulated in the order of the compressor, the hot water supply heat exchanger, the expansion valve, and the first heat exchanger, the hot water supply heat exchanger, and the Heating by connecting the first heat exchanger in parallel and circulating the refrigerant in the order of the compressor, the hot water supply heat exchanger and the first heat exchanger, the expansion valve, and the second heat exchanger. A circulating state switching means switchable to a hot water circulation state, a cooling / hot water simultaneous operation for switching the refrigerant circulation state in the heat pump circuit to the cooling / hot water circulation state by the circulation state switching means, and the heat pump circuit Operation control means capable of performing simultaneous heating / hot water supply operation for switching the circulation state of the refrigerant to the heating / hot water supply circulation state by the circulation state switching means, and the operation control means When performing the heating and hot water supply simultaneous operation, the distribution ratio for distributing the refrigerant from the compressor to both the hot water supply heat exchanger and the first heat exchanger connected in parallel is defined as the first heat. Mode switching means switchable between a hot water supply priority mode in which the hot water supply heat exchanger is distributed over the exchanger, and an air conditioning priority mode in which the hot water heat exchanger is distributed with priority over the first heat exchanger. It equipped with a door,
The circulation state switching means connects the hot water supply heat exchanger and the second heat exchanger in series in the cooling / hot water supply circulation state, and the compressor, the hot water supply heat exchanger, the second heat exchange An in-line cooling / hot water circulation state in which refrigerant is circulated in the order of the exchanger, the expansion valve, and the first heat exchanger, and the hot water heat exchanger and the second heat exchanger are connected in parallel, The compressor, the hot water supply heat exchanger, and the second heat exchanger, the expansion valve, and the first heat exchanger are configured to be switched to a parallel cooling / hot water supply circulation state in which refrigerant is circulated in this order . In the point.

According to this characteristic configuration, the operation control means can switch the refrigerant circulation state in the heat pump circuit to the cooling / hot water circulation state by the circulation state switching means and perform the cooling / hot water supply simultaneous operation. When the circulation state switching means switches to the cooling / hot water circulation state, the refrigerant is circulated in the order of the compressor, the hot water heat exchanger, the expansion valve, and the first heat exchanger. Therefore, in the hot water heat exchanger, In the first heat exchanger, the air supplied to the room can be cooled with the refrigerant while being heated. In this way, the operation control means performs the cooling and hot water supply simultaneous operation, so that the user's request to perform both cooling and hot water supply simultaneously can be met.
Further, when the circulation state switching means is switched to the series cooling / hot water supply circulation state, the hot water supply heat exchanger and the second heat exchanger are connected in series, and the compressor, the hot water supply heat exchanger, the second heat exchange are connected. Since the refrigerant is circulated in the order of the exchanger, the expansion valve, and the first heat exchanger, the refrigerant is supplied not only to the hot water heat exchanger but also to the second heat exchanger, and heat is radiated from the refrigerant in the second heat exchanger. By doing so, the heat pump circuit can be operated efficiently. Further, when the circulation state switching means switches to the parallel cooling / hot water supply circulation state, the hot water supply heat exchanger and the second heat exchanger are connected in parallel, and the compressor, the hot water supply heat exchanger, and the second heat exchange are connected. Since the refrigerant is circulated in the order of both the exchanger, the expansion valve, and the first heat exchanger, the refrigerant is supplied not only to the hot water supply heat exchanger but also to the second heat exchanger, and heat is generated from the refrigerant in the second heat exchanger. The heat pump circuit can be efficiently operated by dissipating heat.
Then, the circulation state switching means is ventilated to, for example, the feed water temperature of hot water supplied to the hot water heat exchanger, the hot water outlet temperature of the refrigerant passing through the hot water heat exchanger, and the second heat exchanger. Switching between the series cooling / hot water circulation state and the parallel cooling / hot water circulation state can be performed based on the ventilation fluid temperature of the fluid. Therefore, in the case where the refrigerant is supplied not only to the hot water supply heat exchanger but also to the second heat exchanger, the cooling for the series is performed based on the temperature conditions such as the supply water temperature, the hot water supply heat exchange outlet temperature, and the ventilation fluid temperature. -By switching between the hot water supply circulation state and the parallel cooling / hot water supply circulation state, heat can be appropriately radiated from the refrigerant in the hot water supply heat exchanger and the second heat exchanger, and the heat pump circuit is operated efficiently. Can be done appropriately.

  The operation control means can perform the heating / hot water supply simultaneous operation by switching the circulation state of the refrigerant in the heat pump circuit to the heating / hot water supply circulation state by the circulation state switching means. When the circulation state switching means switches to the heating / hot water supply circulation state, the hot water supply heat exchanger and the first heat exchanger are connected in parallel, and both the compressor, the hot water supply heat exchanger and the first heat exchanger are expanded. Since the refrigerant is circulated in the order of the valve and the second heat exchanger, the hot water supply heat exchanger can heat the hot water supply water with the refrigerant, and the first heat exchanger can heat the air supplied to the room with the refrigerant. Can do. However, since the hot water supply heat exchanger and the first heat exchanger are connected in parallel, the refrigerant from the compressor is distributed to the hot water supply heat exchanger and the first heat exchanger according to the distribution ratio. In the hot water supply heat exchanger, the hot water supply water cannot be heated sufficiently, or in the first heat exchanger, the air supplied to the room cannot be heated sufficiently. Therefore, according to this feature configuration, when the operation control means performs heating and hot water supply simultaneous operation, the distribution ratio for distributing the refrigerant from the compressor to the hot water supply heat exchanger and the first heat exchanger is adjusted. Further, mode switching means is provided that can be switched between a hot water supply priority mode and an air conditioning priority mode.

In the hot water supply priority mode, the distribution ratio for distributing the refrigerant from the compressor to the hot water supply heat exchanger and the first heat exchanger is set to be a distribution ratio that distributes the hot water supply heat exchanger in preference to the first heat exchanger. In the hot water supply heat exchanger, the hot water supply water can be sufficiently heated to cover the required hot water supply load. In addition, although the refrigerant from the compressor is preferentially supplied to the hot water supply heat exchanger, the remaining refrigerant is supplied to the first heat exchanger. The air supplied to can be heated by heating. In the air conditioning priority mode, the distribution ratio for distributing the refrigerant from the compressor to the hot water supply heat exchanger and the first heat exchanger is distributed as the distribution ratio for the first heat exchanger over the hot water supply heat exchanger. In the first heat exchanger, the air supplied to the room can be sufficiently heated to cover the required heating load. In addition, although the refrigerant from the compressor is preferentially supplied to the first heat exchanger, the remaining refrigerant is supplied to the hot water supply heat exchanger. Can be heated to supply hot water.
Thus, in the hot water supply priority mode, heating can be performed while being able to cover the required hot water supply load, and conversely, in the air conditioning priority mode, while being able to cover the required heating load, Hot water can also be supplied. Then, for example, by selecting whether the user gives priority to heating or hot water supply, the mode switching means switches between the hot water supply priority mode and the air conditioning priority mode according to the user's selection. be able to. Therefore, according to a user's request | requirement, the user's request | requirement of performing both heating and hot_water | molten_metal supply simultaneously can be responded, switching between giving priority to heating or hot water supply.

  A further characteristic configuration of the heat pump hot water supply system according to the present invention is that, in the hot water supply priority mode, the distribution ratio is set smaller than an air conditioning load required by a heat output acquired by the first heat exchanger. In the air conditioning priority mode, the distribution ratio is requested by the heat output acquired by the first heat exchanger. It is in the point set to the distribution ratio for air conditioning priority to cover the.

  According to this feature configuration, in the hot water supply priority mode, the distribution ratio is set to the distribution ratio for hot water supply priority, so that the required hot water supply load can be covered and the heating load can also cover the limited air conditioning load. . In the air conditioning priority mode, since the distribution ratio is set to the air conditioning priority distribution ratio, it is possible to cover the required heating load and to allocate the surplus hot water supply load. Thus, the distribution ratio suitable for each of the hot water supply priority mode and the air conditioning priority mode is set, and an appropriate operation can be performed in each of the hot water supply priority mode and the air conditioning priority mode.

  A further characteristic configuration of the heat pump hot water supply system according to the present invention is provided with an engine that drives the compressor, and an exhaust heat exchanger that heats the hot water supply water by exhaust heat of the engine. .

According to this characteristic configuration, various operations such as a cooling / hot water supply simultaneous operation and a heating / hot water supply simultaneous operation can be performed by driving the compressor with the engine and circulating the refrigerant with the heat pump circuit. When the compressor is driven by the engine, it has a waste heat heat exchanger that heats the hot water supply water with the exhaust heat of the engine, so the exhaust heat of the engine is effectively used to heat the hot water supply water. It is possible to improve energy saving.
When the mode switching means switches to the air conditioning priority mode when performing simultaneous heating and hot water supply operation, refrigerant from the compressor is supplied with priority over the first heat exchanger. There is a possibility that the required hot water supply load cannot be covered only by heating the hot water supply water with the refrigerant. In this case, the hot water supply water can be heated not only in the hot water supply heat exchanger but also in the exhaust heat exchanger, and when performing simultaneous heating and hot water supply operation, even if the mode switching means is switched to the air conditioning priority mode. The required hot water supply load can be covered.

  A further characteristic configuration of the heat pump hot water supply system according to the present invention is that the hot water supply water that has passed through the hot water supply heat exchanger is supplied to the exhaust heat exchanger.

  According to this configuration, first, the hot water supply water can be heated with the refrigerant in the hot water supply heat exchanger, and further, the heated hot water supply water is heated with the exhaust heat of the engine in the exhaust heat exchanger. Therefore, the hot water supply water can be heated to a high temperature. Therefore, the hot water supply water does not have to be heated to a high temperature with the refrigerant in the hot water supply heat exchanger, so that the hot water supply water is heated to a high temperature without causing a problem that the condensing pressure increases and the driving force of the compressor increases. Even when high-temperature hot water supply water is required, the request can be appropriately met.

  A further characteristic configuration of the heat pump hot water supply system according to the present invention is such that the hot water supply water stored in a hot water storage tank is supplied to the exhaust heat heat exchanger, and the hot water supply water that has passed through the exhaust heat heat exchanger is supplied to the hot water storage. A hot water supply water circulation means for returning to the tank, and the operation control means operates the hot water supply water circulation means to operate the exhaust heat heat exchanger when the engine is driven by the engine without a request for hot water supply. The hot water supply operation is performed in such a manner that the hot water supply water heated by the hot water is stored in the hot water storage tank.

  According to this configuration, when there is no request for hot water supply and the compressor is driven by the engine, such as when only air-conditioning operation is performed, the operation control means operates the hot water supply water circulation means to exhaust heat heat exchanger. It is possible to perform a hot water storage operation in which hot water supply water heated in is stored in a hot water storage tank. As a result, when only the air conditioning operation is performed, the exhaust heat of the engine is not simply dissipated, but the exhaust heat of the engine can be stored in the hot water storage tank. For example, when hot water supply is requested, etc. In addition, the heat stored in the hot water storage tank can be used, and energy saving can be improved.

The figure which shows the state at the time of cooling and hot water storage simultaneous operation in the heat pump hot water supply system of a reference example The figure which shows the state at the time of cooling and hot-water supply simultaneous operation in the heat pump hot-water supply system of a reference example The figure which shows the state in the heating and hot water storage simultaneous operation in the heat pump hot water supply system of the reference example The figure which shows the state in the heating / hot-water supply simultaneous operation in the heat pump hot-water supply system of a reference example The figure which shows the state in the hot water supply driving | operation in the heat pump hot water supply system of a reference example The figure which shows the state switched to the air_conditioning | cooling / hot-water supply circulation state for series in the heat pump hot-water supply system of 1st Embodiment. The figure which shows the state switched to the cooling / hot-water supply circulation state for parallel in the heat pump hot-water supply system of 1st Embodiment.

An embodiment of a heat pump hot water supply system according to the present invention will be described with reference to the drawings.
[ Reference example ]
First, FIGS. 1-5 is a figure which shows schematic structure of the heat pump hot-water supply system 100, and the site | parts through which the refrigerant | coolant R, the exhaust heat recovery medium C, and the hot water M flow flow differ. In FIG. 1 to FIG. 5, the parts through which the refrigerant R, the exhaust heat recovery medium C, and the hot water supply water M flow are shown by bold lines, and the motorized valves D1 to D7 and the three-way valves S1 to S5 are closed. It is shown in black, and the open state is shown in white.

As shown in FIGS. 1 to 5, the heat pump hot water supply system 100 in the reference example includes an engine 1 that drives the compressor 2, a compressor 2, a first heat exchanger 3, an expansion valve 4, and a second heat exchanger 5. And a heat pump circuit HP including a hot water supply heat exchanger 6 for heating the hot water supply water M. Thereby, the heat pump hot water supply system 100 drives the compressor 2 by the engine 1 and circulates the refrigerant R in the heat pump circuit HP to perform the air conditioning operation of the cooling operation or the heating operation, and the refrigerant R in the hot water supply heat exchanger 6. The hot water supply operation for heating the hot water supply water M used for hot water supply is performed. The heat pump hot water supply system 100 includes an exhaust heat heat exchanger 7 that heats hot water supply water M with an exhaust heat recovery medium C (for example, engine cooling water) that recovers exhaust heat of the engine 1, and includes a heat pump circuit HP. The hot water supply water M can be heated not only by the refrigerant R but also by the exhaust heat of the engine 1.

  The 1st heat exchanger 3 is comprised by the indoor heat exchanger with which the indoor unit was equipped, and heat-exchanges the air and the refrigerant | coolant R which are ventilated with the indoor fan outside a figure. The 2nd heat exchanger 5 is comprised by the outdoor heat exchanger with which the outdoor unit was equipped, and heat-exchanges the external air and refrigerant | coolant R which are ventilated with the outdoor fan outside a figure. The illustrated example shows an example in which two outdoor heat exchangers, a first outdoor heat exchanger 5a and a second outdoor heat exchanger 5b, are provided as the second heat exchanger 5, and the first outdoor heat exchanger is shown. 5a and the 2nd outdoor heat exchanger 5b are provided in the parallel state.

  The heat pump circuit HP includes a plurality of flow path portions P1 to P8 through which the refrigerant R flows. As the flow path part, the first flow path part P1 connecting the discharge side of the compressor 2 and the second heat exchanger 5, and the intermediate part of the first flow path part P1 and the hot water supply heat exchanger 6 are connected. The second flow path part P2, the third flow path part P3 connecting the hot water supply heat exchanger 6 and the first heat exchanger 3, the intermediate part of the third flow path part P3, and the second heat exchanger 5. , A fifth flow path part P5 connecting the first heat exchanger 3 and the inflow side of the compressor 2, an intermediate part of the fifth flow path part P5 and the first A sixth flow path part P6 that connects the middle part of the flow path part P1 and a seventh flow path part P7 that connects the second heat exchanger 5 and the middle part of the fifth flow path part P5 are provided. Yes. Further, a first parallel flow path portion for allowing the refrigerant R to flow to the first outdoor heat exchanger 5a side in order to allow the refrigerant R to flow through the first outdoor heat exchanger 5a and the second outdoor heat exchanger 5b. An eighth flow path portion P8 connected in parallel to the P8a and the second parallel flow path portion P8b for allowing the refrigerant R to flow to the second outdoor heat exchanger 5b side is provided. The first outdoor heat exchanger 5a and the second outdoor heat exchanger 5b are connected in parallel by the road portion P8.

  The first flow path part P1 is provided with a first motor-operated valve D1 in the middle of the first flow path part P1, and the downstream end in the flow direction of the refrigerant R has the first outdoor heat exchanger 5a and the second outdoor heat exchanger. It is connected to the 8th channel part P8 which connects 5b in a parallel state. One end of the second flow path part P2 is connected to a part between the connection part of the first flow path part P1 with the compressor 2 and the place where the first electric valve D1 is disposed, and the intermediate part thereof. Is provided with a second electric valve D2. A third electric valve D3 is provided in the middle of the third flow path part P3. The fourth flow path part P4 has one end connected to a part between the connection place of the hot water supply heat exchanger 6 and the place where the third electric valve D3 is disposed in the third flow path part P3. A first three-way valve S1 is provided at a connection point between the third flow path part P3 and the fourth flow path part P4. The fourth flow path part P4 is provided with a fourth electric valve D4 in the middle part thereof, and the other end thereof is connected to the first outdoor heat exchanger 5a and the second outdoor heat exchanger 5b in parallel. It is connected to the eight flow path part P8. A fifth electric valve D5 is provided in the middle of the fifth flow path part P5, and a sixth motor operated valve D6 is also provided in the middle of the sixth flow path part P6. The sixth flow path part P6 has one end connected to a part between the connection place with the first heat exchanger 3 and the place where the fifth electric valve D5 is disposed in the fifth flow path part P5, and The other end is connected to a portion between the connection portion with the compressor 2 and the arrangement portion of the first electric valve D1 in the first flow path portion P1. A seventh electric valve D7 is provided in the middle of the seventh flow path portion P7. The seventh flow path part P7 has one end connected to an eighth flow path part P8 that connects the first outdoor heat exchanger 5a and the second outdoor heat exchanger 5b in parallel, and the other end. In the 5th flow-path part P5, it is connected to the site | part between the connection location with the compressor 2, and the arrangement | positioning location of the 5th motor operated valve D5.

In addition to the heat pump circuit HP, the heat pump hot water supply system 100 includes an exhaust heat circuit 9 that can freely supply an exhaust heat recovery medium C (for example, engine cooling water) obtained by recovering exhaust heat of the engine 1 to the exhaust heat exchanger 7. Yes. The exhaust heat circuit 9 includes an exhaust heat return path 10 that supplies the exhaust heat recovery medium C that has recovered the exhaust heat of the engine 1 to the exhaust heat exchanger 7, and an exhaust heat recovery medium C that has passed through the exhaust heat exchanger 7. The exhaust heat return path 11 for returning the exhaust gas to the engine 1 and the exhaust heat bypass path for supplying the exhaust heat recovery medium C of the exhaust heat forward path 10 from the engine 1 to the exhaust heat return path 11 by bypassing the exhaust heat exchanger 7 12. Further, the exhaust heat circuit 9 radiates heat to the outside air ventilated by an outdoor fan (not shown) to reduce the temperature of the exhaust heat recovery medium C when the exhaust heat recovery medium C becomes too hot. An exhaust heat radiator 8 is provided. The exhaust heat radiator 8 is provided in parallel with the exhaust heat return path 11 in the exhaust heat flow path 13.
A second three-way valve S2 is provided at a connection location between the exhaust heat forward passage 10 and the exhaust heat bypass passage 12, and a third three-way valve S3 is provided at a connection location between the exhaust heat return passage 11 and the upstream end of the exhaust heat passage 13. Is provided. In the exhaust heat return path 11, an exhaust heat circulation pump 14 that circulates the exhaust heat recovery medium C in the exhaust heat circuit 9 is provided at a position between the connection position with the exhaust heat bypass path 12 and the connection position with the engine 1. It has been.

  The heat pump hot water supply system 100 includes a hot water supply water circuit 15 that can supply hot water supply water M to the hot water supply heat exchanger 6 and the exhaust heat heat exchanger 7 in addition to the heat pump circuit HP and the exhaust heat circuit 9. The hot water supply water circuit 15 supplies the hot water supply water M stored in the hot water storage tank 16 to the hot water supply heat exchanger 6 and the exhaust heat exchanger 7, and the hot water supply water M that has passed through the exhaust heat heat exchanger 7 is supplied to the hot water storage tank 16. Passed through the hot water supply water circulation path 17 (corresponding to the hot water supply water circulation means), the hot water supply tank 18 for supplying water to the hot water storage tank 16, the hot water supply water M stored in the hot water storage tank 16 and the exhaust heat exchanger 7. A hot water supply channel 19 is provided for supplying hot water M to a hot water use location such as a hot water tap.

  The hot water storage tank 16 is configured by, for example, a sealed tank, and stores hot water M in a state where water having a high temperature (hot water) forms a temperature stratification on the upper side and water having a low temperature on the lower side. It is configured freely. One end portion of the hot water supply water circulation path 17 is connected to the lower portion of the hot water storage tank 16 so that hot water supply water M taken out from the lower portion of the hot water storage tank 16 can be supplied to the hot water supply heat exchanger 6 and the exhaust heat heat exchanger 7. Has been. The other end of the hot water supply water circulation path 17 is connected to the upper part of the hot water storage tank 16, and hot water supplied by the hot water supply heat exchanger 6 and the exhaust heat heat exchanger 7 is supplied to the upper part of the hot water storage tank 16. It is configured to return. The hot water supply water circulation path 17 is provided with a hot water supply water circulation pump 20, and by operating the hot water supply water circulation pump 20, the hot water supply water M in the hot water storage tank 16 is supplied to the hot water supply heat exchanger 6 and the exhaust heat heat exchanger 7. The hot water supply water M that has been supplied and passed through the exhaust heat exchanger 7 is returned to the hot water storage tank 16. Connected to the hot water supply water circulation path 17 is a hot water supply water bypass path 23 that bypasses the hot water supply heat exchanger 6 and supplies the hot water supply water M from the hot water storage tank 16 to the exhaust heat exchanger 7. A fourth three-way valve S4 is provided at a connection point between the passage 17 and the hot water supply water bypass passage 23.

  The water supply path 18 is connected to a portion of the hot water supply water circulation path 17 between a connection point between the lower part of the hot water storage tank 16 and a connection point with the hot water supply heat exchanger 6, and passes through a part of the hot water supply water circulation path 17. The lower part of the hot water storage tank 16 is configured to supply water freely. The hot water supply passage 19 is connected to a portion of the hot water supply water circulation passage 17 between a connection location with the exhaust heat exchanger 7 and a connection location with the upper portion of the hot water storage tank 16, and passes through the exhaust heat exchanger 7. The hot water supply water M or the hot water supply water M taken out from the upper part of the hot water storage tank 16 is configured to be hot water supply to the hot water use location. A fifth three-way valve S5 is provided at a connection point between the hot-water supply water circulation path 17 and the hot-water supply path 19, and the hot-water supply water M that has passed through the exhaust heat exchanger 7 is supplied to the hot water supply path 19 by the fifth three-way valve S5. The hot water supply water M stored in the hot water storage tank 16 is taken out and supplied to the hot water supply passage 19 so as to be switchable. Further, the hot water supply passage 19 is provided with an auxiliary heater 21 that heats the hot water supply water M in the hot water supply passage 19 so as to freely supply hot water to the hot water use location, and the hot water supply water M is more permeable than the auxiliary heater 21. A mixing passage 22 for mixing the hot water supply water M in the hot water supply passage 18 with the hot water supply water M in the hot water supply passage 19 is connected to the downstream portion. The mixing flow path 22 is provided with a mixing amount adjustment valve 24 that can adjust the mixing amount for mixing the hot water supply water M in the water supply passage 18 with the hot water supply water M in the hot water supply passage 19.

  A control device 101 that controls the operation of the heat pump hot water supply system 100 is provided. The control device 101 operates the engine 1, operates the auxiliary heater 21, operates the exhaust heat circulation pump 14, and operates the water circulation pump 20 for hot water supply. The operation of the heat pump hot water supply system 100 is controlled by controlling the operation, the operation of the first to fifth electric valves D1 to D5, and the operation of the first to fifth three-way valves S1 to S5.

  The control device 101 includes a circulation state switching means 102 that can switch the circulation state of the refrigerant R in the heat pump circuit HP, and various operations by switching the circulation state of the refrigerant R in the heat pump circuit HP by the circulation state switching means 102. Operation control means 103 to be performed, and mode switching means 104 that can be switched between a hot water supply priority mode and an air conditioning priority mode when the operation control means 103 performs simultaneous heating and hot water supply operation.

  The circulation state switching means 102 controls the operation of the first to fifth electric valves D1 to D5 and the operation of the first to fifth three-way valves S1 to S5, so that the circulation state of the refrigerant R in the heat pump circuit HP. The cooling / hot water supply circulation state, the heating circulation state, the heating / hot water supply circulation state, and the hot water supply circulation state can be switched.

  In the cooling / hot water supply circulation state, as shown in FIGS. 1 and 2, the circulation state switching means 102 opens the second electric valve D2, the third electric valve D3, and the fifth electric valve D5, The first three-way valve S1 is switched to a state in which the refrigerant R in the third flow path part P3 is supplied to the first heat exchanger 3 as it is in the third flow path part P3. Thereby, in the cooling / hot water supply circulation state, the refrigerant R is circulated in the order of the compressor 2, the hot water supply heat exchanger 6, the third electric valve D 3 (corresponding to the expansion valve 4), and the first heat exchanger 3.

  In the heating circulation state, as shown in FIG. 3, the circulation state switching means 102 opens the sixth motor-operated valve D6, the third motor-operated valve D3, the fourth motor-operated valve D4, and the seventh motor-operated valve D7. The first three-way valve S1 is switched to a state where the refrigerant R from the first heat exchanger 3 side is supplied to the fourth flow path part P4 in the 3 flow path part P3. Thereby, in the heating circulation state, the refrigerant R is circulated in the order of the compressor 2, the first heat exchanger 3, the fourth electric valve D 4 (corresponding to the expansion valve 4), and the second heat exchanger 5.

  In the heating / hot water circulation state, as shown in FIG. 4, the circulation state switching means 102 is operated by the second electric valve D2, the sixth electric valve D6, the third electric valve D3, the fourth electric valve D4, and the seventh electric valve D7. And the refrigerant R from the hot water supply heat exchanger 6 side and the refrigerant R from the first heat exchanger 3 side are merged and supplied to the fourth flow path part P4 in the third flow path part P3. The first three-way valve S1 is switched to the state. Thereby, in the heating / hot water supply circulation state, the hot water supply heat exchanger 6 and the first heat exchanger 3 are connected in parallel, and both the compressor 2, the hot water supply heat exchanger 6 and the first heat exchanger 3, The refrigerant R is circulated in the order of the fourth electric valve D4 (corresponding to the expansion valve 4) and the second heat exchanger 5.

  In the hot water supply circulation state, as shown in FIG. 5, the circulation state switching means 102 opens the second electric valve D2, the fourth electric valve D4, and the seventh electric valve D7, and at the third flow path part P3. The first three-way valve S1 is switched to a state in which the refrigerant R from the hot water supply heat exchanger 6 side is supplied to the fourth flow path part P4. Thereby, in the hot water supply circulation state, the refrigerant R is circulated in the order of the compressor 2, the hot water supply heat exchanger 6, the fourth electric valve D 4 (corresponding to the expansion valve 4), and the second heat exchanger 5.

  The operation control unit 103 switches the circulation state of the refrigerant R in the heat pump circuit HP by the circulation state switching unit 102, operates the engine 1, operates the second to fifth three-way valves S2 to S5, and controls the exhaust heat circulation pump 14. By controlling the operation and the operation of the hot water circulation pump 20, various operations such as a cooling operation, a heating operation, a hot water supply operation, and a hot water storage operation are performed. And, for the request for the air conditioning operation of the cooling operation or the heating operation, for example, the user is requested by operating the air conditioner remote controller, and for the request for the hot water supply operation, for example, a hot water tap at the hot water use location is used. It is requested by the user to open or to operate the remote control by the user. Further, the operation control means 103 is configured to perform a hot water storage operation when there is no request for hot water supply and the compressor 2 is driven by the engine 1 such as when performing only a cooling operation or only a heating operation.

  In this way, the operation control means 103 performs the cooling / hot water simultaneous operation for simultaneously performing the cooling operation and the hot water storage operation, and the cooling / hot water simultaneous operation for simultaneously performing the cooling operation and the hot water supply operation according to the user's request. The system is configured to perform various operations such as simultaneous heating / hot water storage operation in which heating operation and hot water storage operation are performed simultaneously, simultaneous heating / hot water operation in which heating operation and hot water supply operation are performed simultaneously, and independent hot water supply operation. Yes.

Hereinafter, the operation in each operation will be described.
(Simultaneous cooling and hot water storage)
In the simultaneous cooling and hot water storage operation, as shown in FIG. 1, the operation control means 103 operates the engine 1 for the heat pump circuit HP, and the circulation state switching means 102 cools the circulation state of the refrigerant R in the heat pump circuit HP.・ Switched to hot water circulation. For the exhaust heat circuit 9, the operation control means 103 switches the states of the second three-way valve S2 and the third three-way valve S3 so that the exhaust heat recovery medium C circulates in the order of the engine 1 and the exhaust heat exchanger 7. Thus, the exhaust heat circulation pump 14 is operated. With respect to the hot water supply water circuit 15, the operation control means 103 causes the hot water supply water M taken out from the lower part of the hot water storage tank 16 to pass through the hot water supply heat exchanger 6 and the exhaust heat heat exchanger 7 in this order to return to the upper part of the hot water storage tank 16. As described above, the hot water supply water circulation pump 20 is operated by switching the states of the fourth three-way valve S4 and the fifth three-way valve S5.

  In the heat pump circuit HP, the refrigerant R heats the hot water supply water M in the hot water supply heat exchanger 6 to dissipate the heat, and the first heat exchanger 3 absorbs heat from the air ventilated by an indoor fan outside the figure. Then, the cooled air is supplied to the room to cool it. In the hot water supply water circuit 15, the hot water supply water M taken out from the lower part of the hot water storage tank 16 is first supplied to the hot water supply heat exchanger 6, heated by the refrigerant R, and further supplied to the exhaust heat exchanger 7. It is heated by the exhaust heat recovery medium C and returned to the upper part of the hot water storage tank 16. Hot water for hot water supply M (for example, hot water at 60 ° C.) is stored in the hot water storage tank 16. In this way, both indoor cooling and hot water storage in the hot water storage tank 16 are performed simultaneously.

(Simultaneous cooling and hot water supply operation)
In the simultaneous cooling / hot-water supply operation, as shown in FIG. 2, the operation control means 103 operates the engine 1 for the heat pump circuit HP, and the circulation state switching means 102 cools the circulation state of the refrigerant R in the heat pump circuit HP.・ Switched to hot water circulation. For the exhaust heat circuit 9, the operation control means 103 switches the states of the second three-way valve S2 and the third three-way valve S3 so that the exhaust heat recovery medium C circulates in the order of the engine 1 and the exhaust heat exchanger 7. Thus, the exhaust heat circulation pump 14 is operated. With respect to the hot water supply water circuit 15, the operation control means 103 supplies the hot water supply water M supplied through the water supply passage 18 to the hot water supply passage 19 through the hot water supply heat exchanger 6 and the exhaust heat exchanger 7 in this order. In addition, the hot water supply water circulation pump 20 is operated by switching the states of the fourth three-way valve S4 and the fifth three-way valve S5.

In the heat pump circuit HP, the refrigerant R heats the hot water supply water M in the hot water supply heat exchanger 6 to dissipate the heat, and the first heat exchanger 3 absorbs heat from the air ventilated by an indoor fan outside the figure. Then, the cooled air is supplied to the room to cool it. In the hot water supply water circuit 15, the hot water supply water M supplied through the water supply passage 18 is first supplied to the hot water supply heat exchanger 6 and heated by the refrigerant R, and further supplied to the exhaust heat heat exchanger 7 to be discharged. Heated by the heat recovery medium C and supplied to the hot water supply channel 19. Then, the hot water supply water M in the hot water supply passage 19 is mixed with the hot water supply water M from the mixing flow path 22, adjusted to the hot water supply set temperature, and supplied to the hot water use location. Here, the hot water supply set temperature is configured to be freely settable by the user with a remote controller. For adjustment to the hot water supply set temperature, for example, the operation control means 103 is provided with a temperature sensor, a flow sensor, etc. Based on the detection information, the opening of the mixing amount adjusting valve 24 is controlled so that the temperature of the hot water supply water M mixed with the hot water supply water M from the mixing flow path 22 becomes the hot water supply set temperature. The mixing amount of hot water supply water M from 22 is adjusted. By the way, when the required hot water supply set temperature is high or the required hot water supply load cannot be covered, the operation control means 103 operates the auxiliary heater 21 to request the required hot water supply. I try to cover the load.
In this way, both indoor cooling and hot water supply to the hot water use location are performed simultaneously. In the simultaneous cooling and hot water supply operation, the operation control means 103 switches the state of the fifth three-way valve S5 in the hot water supply water circuit 15, for example, the hot water supply water M that has passed through the exhaust heat exchanger 7 and the hot water storage tank 16 The hot water supply water M stored in the hot water can be mixed and supplied to the hot water supply passage 19.

(Simultaneous operation of heating and hot water storage)
In the simultaneous heating and hot water storage operation, as shown in FIG. 3, the operation control means 103 operates the engine 1 for the heat pump circuit HP, and the circulation state switching means 102 heats the circulation state of the refrigerant R in the heat pump circuit HP. Switching to a circulating state. For the exhaust heat circuit 9, the operation control means 103 switches the states of the second three-way valve S2 and the third three-way valve S3 so that the exhaust heat recovery medium C circulates in the order of the engine 1 and the exhaust heat exchanger 7. Thus, the exhaust heat circulation pump 14 is operated. With respect to the hot water supply water circuit 15, the operation control means 103 supplies the hot water supply water M taken out from the lower part of the hot water storage tank 16 to the exhaust heat heat exchanger 7, and stores the hot water supply water M that has passed through the exhaust heat heat exchanger 7. The hot water supply water circulation pump 20 is operated by switching the state of the fourth three-way valve S4 and the fifth three-way valve S5 so as to return to the upper part of the tank 16.

  In the heat pump circuit HP, in the first heat exchanger 3, the refrigerant R heats the air ventilated by an indoor fan (not shown) to dissipate the heat, and the heated air is supplied indoors for heating. 2 The refrigerant R absorbs heat from the outside air in the heat exchanger 5. In the hot water supply water circuit 15, the hot water supply water M taken out from the lower part of the hot water storage tank 16 is supplied to the exhaust heat exchanger 7, heated by the exhaust heat recovery medium C, and returned to the upper part of the hot water storage tank 16 to store hot water. Hot water for hot water supply M (for example, 60 ° C. hot water) is stored in the tank 16. In this way, both indoor heating and hot water storage in the hot water storage tank 16 are performed simultaneously.

(Simultaneous operation of heating and hot water supply)
In the simultaneous heating / hot water supply operation, as shown in FIG. 4, the operation control means 103 operates the engine 1 for the heat pump circuit HP, and the circulation state switching means 102 heats the circulation state of the refrigerant R in the heat pump circuit HP.・ Switched to hot water circulation. For the exhaust heat circuit 9, the operation control means 103 switches the states of the second three-way valve S2 and the third three-way valve S3 so that the exhaust heat recovery medium C circulates in the order of the engine 1 and the exhaust heat exchanger 7. Thus, the exhaust heat circulation pump 14 is operated. With respect to the hot water supply water circuit 15, the operation control means 103 supplies the hot water supply water M supplied through the water supply passage 18 to the hot water supply passage 19 through the hot water supply heat exchanger 6 and the exhaust heat exchanger 7 in this order. In addition, the hot water supply water circulation pump 20 is operated by switching the states of the fourth three-way valve S4 and the fifth three-way valve S5.

  In the heat pump circuit HP, in the first heat exchanger 3, the refrigerant R heats the air ventilated by an indoor fan (not shown) to dissipate heat, and the heated air is supplied to the room for heating. In the hot water supply heat exchanger 6, the refrigerant R heats the hot water supply water M to dissipate heat, and in the second heat exchanger 5, the refrigerant R absorbs heat from the outside air. In the hot water supply water circuit 15, the hot water supply water M supplied through the water supply path 18 is first supplied to the hot water supply heat exchanger 6 and heated by the refrigerant R, and further supplied to the exhaust heat exchanger 7 to be discharged. Heated by the heat recovery medium C and supplied to the hot water supply channel 19. Then, similarly to the above-described simultaneous cooling and hot water supply operation, the hot water supply water M in the hot water supply passage 19 is mixed with the hot water supply water M from the mixing flow path 22, adjusted to the hot water supply set temperature, and supplied to the hot water use location. Therefore, both indoor heating and hot water supply to the hot water use location can be performed simultaneously.

In this heating and hot water supply simultaneous operation, indoor heating and hot water supply to the hot water use location are performed at the same time, but depending on the situation where the required heating load is large, it becomes impossible to cover the heating load, Alternatively, if the heating load is covered, there is a possibility that hot water cannot be supplied and the user's request cannot be met.
Therefore, in this reference example , the mode switching means 104 is configured to be switchable between the hot water supply priority mode and the air conditioning priority mode. As to whether to switch to the hot water supply priority mode or the air conditioning priority mode, for example, a remote control or the like is provided with a mode switch, and the user operates the mode switch to switch to the hot water supply priority mode, or The air conditioning priority mode can be selected.

  In the simultaneous heating / hot water supply operation, the circulation state switching means 102 switches to the heating / hot water circulation state, and the refrigerant R from the compressor 2 is connected to the first heat exchanger 3 and the hot water supply heat exchanger connected in parallel. In this way, heating and hot water supply are performed simultaneously. Therefore, the mode switching means 104 controls the opening degree of the second motor-operated valve D2 and the sixth motor-operated valve D6 so that both the first heat exchanger 3 and the hot water supply heat exchanger 6 connected in parallel are connected. A hot water supply priority mode in which the distribution ratio for distributing the refrigerant R from the compressor 2 is distributed over the hot water supply heat exchanger 6 over the first heat exchanger 3, and the first heat exchanger over the hot water supply heat exchanger 6. 3 is configured to be switchable to an air conditioning priority mode that is distributed with priority over 3.

  In the hot water supply priority mode, the mode switching means 104 controls the opening degree of the sixth motor-operated valve D6 to be more open than the opening degree of the second motor-operated valve D2, so that the refrigerant R from the compressor 2 is supplied to the first heat exchanger. The hot water supply heat exchanger 6 is supplied in preference to the hot water supply heat exchanger 6. In this hot water supply priority mode, the limited air conditioning load (for example, the requested air conditioning load is set smaller than the air conditioning load requested by the heat output acquired by the first heat exchanger 3 for the distribution ratio. Is also set to a hot water supply priority distribution ratio to cover the air conditioning load reduced by 10 to 30%. Here, the required air conditioning load is obtained based on the temperature difference between the current room temperature and the cooling set temperature. As a result, in the hot water supply priority mode, the distribution ratio at which the mode switching means 104 distributes the refrigerant R from the compressor 2 to both the first heat exchanger 3 and the hot water supply heat exchanger 6 connected in parallel is the hot water supply. The opening degree of the second motor-operated valve D2 and the sixth motor-operated valve D6 is controlled so that the priority distribution ratio is obtained. In the hot water supply priority mode, while the hot water supply that can properly cover the required hot water supply load can be performed, the air supplied to the room with the remaining refrigerant R is heated and the required heating load is exceeded. Although it is small, heating that can cover the limited air-conditioning load can be performed.

  In the air conditioning priority mode, the mode switching means 104 controls the opening degree of the second motor-operated valve D2 to the opening side with respect to the opening degree of the sixth motor-operated valve D6, and supplies the refrigerant R from the compressor 2 to the hot water supply heat exchanger 6. Rather than the first heat exchanger 3. In this air conditioning priority mode, the distribution ratio is set to an air conditioning priority distribution ratio that covers the air conditioning load required by the heat output acquired by the first heat exchanger 3. Thus, in the air conditioning priority mode, the distribution ratio at which the mode switching means 104 distributes the refrigerant R from the compressor 2 to both the first heat exchanger 3 and the hot water supply heat exchanger 6 connected in parallel is air conditioning. The opening degree of the second motor-operated valve D2 and the sixth motor-operated valve D6 is controlled so that the priority distribution ratio is obtained. In the air conditioning priority mode, hot water can be supplied by heating the hot water M with the remaining refrigerant R while performing heating that can properly cover the required heating load.

In this reference example , the hot water supply water M supplied in the water supply passage 18 is heated not only in the hot water supply heat exchanger 6 but also in the exhaust heat exchanger 7 and supplied to the hot water supply passage 19. Even when switched to, the hot water supply water M at the hot water supply set temperature can be supplied to the hot water use location, and hot water supply that can cover the required hot water supply load can be performed. Further, when the required hot water supply set temperature is high, the required hot water supply load is large, and the required hot water supply load is covered only by heating with the hot water supply heat exchanger 6 and the exhaust heat exchanger 7. Even when the operation cannot be performed, the operation control means 103 operates the auxiliary heater 21 to cover the required hot water supply load.

  About the distribution ratio in hot water supply priority mode and air-conditioning priority mode, it can be set as a fixed distribution ratio, or it can change and set. When the distribution ratio is changed and set, for example, it can be changed and set according to a user request.

(Hot water operation)
In the hot water supply operation, as shown in FIG. 5, with respect to the heat pump circuit HP, the operation control means 103 operates the engine 1, and the circulation state switching means 102 changes the circulation state of the refrigerant R in the heat pump circuit HP to the hot water supply circulation state. Switching. For the exhaust heat circuit 9, the operation control means 103 switches the states of the second three-way valve S2 and the third three-way valve S3 so that the exhaust heat recovery medium C circulates in the order of the engine 1 and the exhaust heat exchanger 7. Thus, the exhaust heat circulation pump 14 is operated. With respect to the hot water supply water circuit 15, the operation control means 103 supplies the hot water supply water M supplied through the water supply passage 18 to the hot water supply passage 19 through the hot water supply heat exchanger 6 and the exhaust heat exchanger 7 in this order. In addition, the hot water supply water circulation pump 20 is operated by switching the states of the fourth three-way valve S4 and the fifth three-way valve S5.

  In the heat pump circuit HP, the refrigerant R heats the hot water supply water M in the hot water supply heat exchanger 6 and is dissipated, and the refrigerant R absorbs heat from the outside air in the second heat exchanger 5. In the hot water supply water circuit 15, the hot water supply water M supplied through the water supply passage 18 is first supplied to the hot water supply heat exchanger 6 and heated by the refrigerant R, and further supplied to the exhaust heat heat exchanger 7 to be discharged. Heated by the heat recovery medium C and supplied to the hot water supply channel 19. Then, similarly to the above-described simultaneous cooling and hot water supply operation, the hot water supply water M in the hot water supply passage 19 is mixed with the hot water supply water M from the mixing flow path 22, adjusted to the hot water supply set temperature, and supplied to the hot water use location. In this way, hot water is supplied to the hot water use location.

First Embodiment
In the above reference example , as shown in FIG. 2, when the circulation state switching means 102 is switched to the cooling / hot water supply circulation state, the compressor 2, the hot water supply heat exchanger 6, the third electric valve D3 (corresponding to the expansion valve 4). The refrigerant R is circulated in the order of the first heat exchanger 3.
Instead, in this first embodiment, the circulation state switching means 102 is in the cooling / hot water supply circulation state, and the serial refrigerant / hot water circulation state shown in FIG. 6 and the parallel refrigerant / hot water circulation state shown in FIG. And can be switched between.

  In addition to the first to eighth flow path portions P1 to P8, the heat pump circuit HP includes a ninth flow path portion P9 that connects a midway portion of the third flow path portion P3 and a midway portion of the first flow path portion P1. Is provided. The ninth flow path part P9 is provided with an eighth electric valve D8 in the middle of the ninth flow path part P9, one end of which is connected to the hot water supply heat exchanger 6 in the third flow path part P3 and the arrangement of the first three-way valve S1. The other end of the first flow path part P1 is connected to a part between the installation part and the connection part between the first electric valve D1 and the eighth flow path part P8. It is connected. The third flow path part P3 is provided with a ninth electric valve D9 at a part between the connection point with the ninth flow path part P9 and the place where the first three-way valve S1 is disposed.

  In the serial refrigerant / hot water supply circulation state, as shown in FIG. 6, the circulation state switching means 102 has the second motor-operated valve D2, the eighth motor-operated valve D8, the fourth motor-operated valve D4, the third motor-operated valve D3, and the fifth motor-operated valve. While opening the valve D5, the first three-way valve S1 is switched to a state where the refrigerant R of the fourth flow path part P4 is supplied to the first heat exchanger 3 side in the third flow path part P3. Thereby, in the serial refrigerant / hot water supply circulation state, the hot water supply heat exchanger 6 and the second heat exchanger 5 are connected in series, and the compressor 2, the hot water supply heat exchanger 6, the second heat exchanger 5, The refrigerant R is circulated in the order of one or both of the fourth electric valve D4 and the third electric valve D3 (corresponding to the expansion valve 4) and the first heat exchanger 3.

  In the parallel refrigerant / hot water supply circulation state, as shown in FIG. 7, the circulation state switching means 102 includes the first motor-operated valve D1, the second motor-operated valve D2, the ninth motor-operated valve D9, the fourth motor-operated valve D4, and the third motor-operated valve. The valve D3 and the fifth electric valve D5 are opened, and the refrigerant R from the hot water supply heat exchanger 6 side and the refrigerant R in the fourth flow path part P4 are merged in the third flow path part P3 to generate a third flow. The first three-way valve S1 is switched to a state of supplying to the first heat exchanger 3 side in the road part P3. Thereby, the hot water supply heat exchanger 6 and the second heat exchanger 5 are connected in parallel, and both the compressor 2, the hot water supply heat exchanger 6 and the second heat exchanger 5, or the hot water supply heat exchanger 6 are connected. The refrigerant R is circulated in the order of the third motor-operated valve D3 (corresponding to the expansion valve 4) and the first heat exchanger 3 independently of each of the second heat exchanger 5 and the second heat exchanger 5.

  Regarding switching between the serial refrigerant / hot water supply circulation state and the parallel refrigerant / hot water supply circulation state, the circulation state switching means 102 supplies the hot water supply water t to the hot water supply water M supplied to the hot water supply heat exchanger 6 and the hot water supply heat. Based on the heat exchange outlet temperature t2 for hot water supply of the refrigerant R that has passed through the exchanger 6 and the ventilation fluid temperature (outside air temperature) t3 of the fluid (outside air) that is ventilated to the second heat exchanger 5, Switching between the hot water supply circulation state and the parallel refrigerant / hot water supply circulation state is performed.

In the first embodiment, the first temperature sensor T1 that detects the feed water temperature t1 of the hot water supply water M supplied to the hot water supply heat exchanger 6, the hot water supply heat exchange outlet temperature t2 of the refrigerant R that has passed through the hot water supply heat exchanger 6. And a third temperature sensor T3 for detecting the ventilation fluid temperature (outside air temperature) t3 of the fluid (outside air) ventilated through the second heat exchanger 5.
The circulating state switching means 102 is for hot water supply by the first temperature sensor T1 where the feed water temperature t1 is lower than the outside air temperature t3 by the third temperature sensor T3 and the outside temperature t3 by the third temperature sensor T3 is by the second temperature sensor T2. When the temperature is lower than the heat exchange outlet temperature t2, as shown in FIG. 6, the state is switched to the serial refrigerant / hot water supply circulation state. Further, the circulation state switching means 102, as shown in FIG. 6, can also be used for the serial refrigerant / heat exchanger outlet temperature t2 by the second temperature sensor T2 to be higher than the outdoor air temperature t3 by the third temperature sensor T3. Switching to hot water circulation. Thus, by supplying the refrigerant R in series in the order of the hot water supply heat exchanger 6 and the second heat exchanger 5, the refrigerant R heats the hot water supply water M in the hot water supply heat exchanger 6 to dissipate heat, and further, The refrigerant R radiated by the hot water supply heat exchanger 6 in the two heat exchangers 5 heats the outside air to dissipate the heat, thereby operating the heat pump circuit HP efficiently.

  Further, the circulation state switching means 102 is such that the feed water temperature t1 by the first temperature sensor T1 is higher than the outside air temperature t3 by the third temperature sensor T3, and the outside air temperature t3 by the third temperature sensor T3 is by the second temperature sensor T2. When it is higher than the hot water supply heat exchange outlet temperature t2, the state is switched to the parallel refrigerant / hot water supply circulation state as shown in FIG. Further, the circulation state switching means 102 is also provided with the parallel refrigerant / cooling unit as shown in FIG. 7 even when the hot water supply heat exchange outlet temperature t2 by the second temperature sensor T2 is lower than the outside air temperature t3 by the third temperature sensor T3. Switching to hot water circulation. Thus, by supplying the refrigerant R in parallel to the hot water supply heat exchanger 6 and the second heat exchanger 5, the refrigerant R heats the hot water supply water M and dissipates heat in the hot water supply heat exchanger 6, and the second In the heat exchanger 5, the refrigerant R heats the outside air to dissipate the heat, and operates the heat pump circuit HP efficiently.

[Another embodiment]
(1) In the reference example and the first embodiment, when performing cooling operation or heating operation, hot water storage operation is also performed at the same time, but without performing hot water storage operation, cooling operation or heating operation is performed independently. It can also be done.

  The present invention includes a heat pump circuit that includes a compressor, a first heat exchanger, an expansion valve, a second heat exchanger, and a hot water supply heat exchanger that heats hot water supply water. It can be applied not only to both heating and hot water supply, but also to various heat pump hot water supply systems that can meet the user's request to perform both air conditioning and hot water supply simultaneously.

DESCRIPTION OF SYMBOLS 1 Engine 2 Compressor 3 1st heat exchanger 4 Expansion valve 5 2nd heat exchanger 6 Hot water supply heat exchanger 7 Waste heat exchanger 16 Hot water storage tank 17 Hot water supply water circulation path (hot water supply water circulation means)
102 Circulating state switching means 103 Operation control means 104 Mode switching means HP Heat pump circuit C Waste heat recovery medium M Hot water supply water R Refrigerant

Claims (5)

A heat pump hot water supply system including a heat pump circuit including a compressor, a first heat exchanger, an expansion valve, a second heat exchanger, and a hot water heat exchanger for heating hot water,
Regarding the circulation state of the refrigerant in the heat pump circuit, a cooling / hot water circulation state in which refrigerant is circulated in the order of the compressor, the hot water supply heat exchanger, the expansion valve, and the first heat exchanger, the hot water supply heat exchanger, and the Heating by connecting the first heat exchanger in parallel and circulating the refrigerant in the order of the compressor, the hot water supply heat exchanger and the first heat exchanger, the expansion valve, and the second heat exchanger.・ Circulation state switching means capable of switching to hot water circulation state;
The cooling / hot water supply simultaneous operation for switching the circulation state of the refrigerant in the heat pump circuit to the cooling / hot water circulation state by the circulation state switching means, and the heating / hot water supply for the circulation state of the refrigerant in the heat pump circuit by the circulation state switching means. Operation control means capable of performing simultaneous heating and hot water supply switching to a circulating state;
When the operation control means performs the heating and hot water supply simultaneous operation, a distribution ratio for distributing the refrigerant from the compressor to both the hot water heat exchanger and the first heat exchanger connected in parallel is set. Switching between a hot water supply priority mode in which the hot water supply heat exchanger is distributed over the first heat exchanger and an air conditioning priority mode in which the hot water heat exchanger is distributed with priority over the first heat exchanger. Flexible mode switching means ,
The circulation state switching means connects the hot water supply heat exchanger and the second heat exchanger in series in the cooling / hot water supply circulation state, and the compressor, the hot water supply heat exchanger, the second heat exchange An in-line cooling / hot water circulation state in which refrigerant is circulated in the order of the exchanger, the expansion valve, and the first heat exchanger, and the hot water heat exchanger and the second heat exchanger are connected in parallel, The compressor, the hot water supply heat exchanger, and the second heat exchanger, the expansion valve, and the first heat exchanger are configured to be switched to a parallel cooling / hot water supply circulation state in which refrigerant is circulated in this order . Heat pump hot water supply system.   In the hot water supply priority mode, the distribution ratio is set to a distribution ratio for hot water supply priority to cover the limited air conditioning load set smaller than the air conditioning load required by the heat output acquired by the first heat exchanger. In the air conditioning priority mode, the distribution ratio is set to an air conditioning priority distribution ratio to cover the air conditioning load required by the heat output acquired by the first heat exchanger. The heat pump hot water supply system according to claim 1.   The heat pump hot water supply system according to claim 1 or 2, further comprising: an engine that drives the compressor; and an exhaust heat exchanger that heats the hot water supply water with exhaust heat of the engine.   The heat pump hot water supply system according to claim 3, wherein the hot water supply water that has passed through the hot water supply heat exchanger is configured to be supplied to the exhaust heat heat exchanger.   The hot water supply water stored in the hot water storage tank is supplied to the exhaust heat heat exchanger, and the hot water supply water circulation means for returning the hot water supply water that has passed through the exhaust heat heat exchanger to the hot water storage tank is provided, and the operation control means When there is no request for hot water supply and the compressor is driven by the engine, the hot water supply water circulating means is operated and the hot water supply water heated by the exhaust heat exchanger is stored in the hot water storage tank. The heat pump hot water supply system according to claim 3 or 4 configured to perform hot water storage operation.

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