JP6861065B2 - Hot water supply system - Google Patents

Description

The present invention relates to a hot water supply system.

Patent Document 1 discloses a hot water supply system including a tank for storing hot water supply water, a bathtub for storing bathtub water, and a heat pump unit. The heat pump unit is between a refrigerant circulation path for circulating a refrigerant, a compressor that compresses the refrigerant, a hot water supply water heat exchanger that exchanges heat between the refrigerant and the hot water supply water, and a refrigerant and bath water. It is provided with a bath water heat exchanger that exchanges heat with the outside air heat exchanger that exchanges heat between the refrigerant and the outside air, and an expansion valve that reduces the pressure of the refrigerant. Further, the heat pump unit includes a switch that switches the circulation path of the refrigerant according to the operation mode of the hot water supply system.

(I) In the hot water supply heating mode in which the hot water supply water is heated using the outside air heat, the switch circulates the refrigerant in the order of the compressor, the hot water supply water heat exchanger, the expansion valve, and the outside air heat exchanger. (Ii) In the heat recovery mode in which the hot water supply water is heated by using the preheating of the bath water, the switch is a compressor, a hot water supply water heat exchanger, an expansion valve, an outside air heat exchanger, and a bath water heat exchanger in this order. To circulate. (Iii) In the reheating mode in which at least the bath water of the bath water and the hot water supply water is heated by using the outside air heat, the switch is a compressor, a hot water supply water heat exchanger, a bath water heat exchanger, an expansion valve, The refrigerant is circulated in the order of the outside air heat exchanger.

Japanese Unexamined Patent Publication No. 2001-91096

In the hot water supply system of Patent Document 1, when the operation is performed in the reheating mode of the above (iii), the refrigerant is always a compressor and a hot water supply water heat exchanger regardless of whether or not the hot water supply water should be heated. , Bath water heat exchanger, expansion valve, outside air heat exchanger circulate in this order. Therefore, even in a situation where heating of the hot water supply water is not required, the high-temperature refrigerant compressed by the compressor is supplied to the bath water heat exchanger after passing through the hot water supply water heat exchanger. In the hot water supply heat exchanger, heat is exchanged between the refrigerant and the hot water supply water that stays inside the hot water supply water heat exchanger, so the heat supplied to the bath water is reduced by that amount, and the bath water is efficiently supplied. There may be a situation where the heat cannot be heated.

In the present specification, when the bathtub water should be heated by using the heat of the outside air, a technique capable of heating the bathtub water more efficiently than in the prior art is disclosed.

The hot water supply system disclosed in the present specification includes a tank for storing hot water supply water, a bathtub for storing bath water, and a heat pump unit. The heat pump unit includes a refrigerant circulation path for circulating a refrigerant and the refrigerant. A compressor that compresses the water heater, a hot water water heat exchanger that exchanges heat between the refrigerant and the hot water supply water, a bath water heat exchanger that exchanges heat between the refrigerant and the hot water supply water, and the above. The outside air heat exchanger, which is connected in series with the water heater water heater and exchanges heat between the refrigerant and the outside air, the expansion valve for reducing the pressure of the refrigerant, and the refrigerant circulation path are connected by the compressor. The hot water heating state in which the compressed refrigerant is supplied to the hot water heat exchanger, and the bath without the refrigerant compressed by the compressor being supplied to the hot water heat exchanger. It is provided with a switching unit for switching between the heated state of the bath water supplied to the water heat exchanger and the heating state. In the hot water supply heating state, the refrigerant circulates in the refrigerant circulation path in the order of the compressor, the hot water supply water heat exchanger, and the expansion valve, and then the outside air heat exchanger and the bath water heat exchanger. Includes a bath heat recovery state in which the refrigerant is again supplied to the compressor via.

In the above hot water supply system, when the switching unit switches the refrigerant circulation path to the bath water heating state, the refrigerant after being compressed by the compressor is supplied to the bath water heat exchanger without being supplied to the hot water water heat exchanger. To. That is, when the bathtub water should be heated using the outside air heat, heat dissipation loss does not occur in the hot water supply water heat exchanger. Therefore, when the bath water should be heated using the outside air heat, the high-temperature refrigerant after being compressed by the compressor is supplied to the bath water heat exchanger via the hot water water heat exchanger in the conventional hot water supply. Compared to the system, it can supply enough heat to the water heater. Therefore, according to the above-mentioned hot water supply system, when the bathtub water should be heated by using the outside air heat, the bathtub water can be heated more efficiently than in the conventional case. In the hot water supply water heating state, the operation of heating the hot water supply water can be executed by utilizing the heat of the bathtub heat.

The switching portion preferably includes a four-way valve. The four-way valve has a first state of connecting the outlet side of the compressor and one end of the hot water supply water heat exchanger, and a first state of connecting the outlet side of the compressor and one end of the bathtub water heat exchanger. It is preferable that the two states can be switched. It is preferable that the four-way valve is set to the first state in the hot water supply heating state, and the four-way valve is set to the second state in the bathtub water heating state.

According to this configuration, in the hot water supply system, it is possible to adopt a configuration in which the four-way valve can be switched between the first state and the second state to switch between the hot water supply water heating state and the bathtub water heating state. Therefore, the hot water supply system can switch between the hot water supply water heating state and the bathtub water heating state by using a relatively simple configuration.

The figure which shows typically the structure of the hot water supply system 2 of 1st Example. A table explaining the state of each element in each operation mode of the first embodiment. The figure which shows typically the operation in the outside air heat storage mode of 1st Example. The figure which shows typically the operation in the bathtub heat storage mode of 1st Example. The figure which shows typically the operation in the reheating mode of 1st Example. The figure which shows typically the operation in the defrosting mode of 1st Example. The figure which shows typically the structure of the hot water supply system 102 of 2nd Example. A table explaining the state of each element in each operation mode of the second embodiment. The figure which shows typically the operation in the outside air heat storage mode of 2nd Example. The figure which shows typically the operation in the bathtub heat storage mode of 2nd Example. The figure which shows typically the operation in the reheating mode of 2nd Example. The figure which shows typically the operation in the defrosting mode of 2nd Example.

(First Example)
(System configuration; Fig. 1)
As shown in FIG. 1, the hot water supply system 2 of this embodiment includes a tank unit 10, a heat pump unit 30, a bathtub unit 70, a burner unit 80, and a controller 100.

The tank unit 10 is a hot water supply unit for storing hot water for hot water supply and supplying it to a necessary place. The tank unit 10 includes a tank 12, a water supply path 14, a hot water discharge path 16, a tank circulation path 18, and a tank pump 20. The tank 12 is a closed type container whose outside is covered with a heat insulating material and which stores water for hot water supply (hereinafter referred to as “hot water supply water”). The tank 12 stores the hot water supply water heated by heat exchange with the refrigerant in the hot water supply water heat exchanger 36 of the heat pump unit 30. The volume of the tank 12 is 100 L.

The tank circulation path 18 is a circulation path for drawing hot water from the bottom of the tank 12 and returning it to the top of the tank 12. The tank circulation path 18 passes through the hot water supply water heat exchanger 36 of the heat pump unit 30. The tank pump 20 is provided in the tank circulation path 18. When the tank pump 20 is operated, the hot water supply water is sucked out from the bottom of the tank 12 and sent to the hot water supply water heat exchanger 36. The hot water supply water that has become hot due to heat exchange with the refrigerant in the hot water supply water heat exchanger 36 is returned from the top of the tank 12 into the tank 12. When the high-temperature hot water supply water after heating flows into the tank 12, a temperature stratification is formed inside the tank 12 in which a layer of high-temperature hot water supply water is stacked on a layer of low-temperature hot water supply water.

The water supply path 14 is connected to the bottom of the tank 12. Tap water is supplied to the bottom of the tank 12 via the water supply path 14. The hot water discharge path 16 is connected to the top of the tank 12. Hot water in the tank 12 is supplied to a desired hot water supply location (for example, a bathtub 72) via the hot water outlet path 16.

The heat pump unit 30 is a heating unit for absorbing heat from the outside air to heat the hot water supply water in the tank 12 and the water in the bathtub 72 (hereinafter referred to as “bathtub water”). The heat pump unit 30 includes a refrigerant circulation path 32, a compressor 34, a hot water supply water heat exchanger 36, a first expansion valve 38, a first check valve 40, a second expansion valve 42, and an outside air heat exchanger. It includes 44, a fan 46, a bath water heat exchanger 48, a bypass path 50, an on-off valve 52, a second check valve 54, a first four-way valve 60, and a second four-way valve 62.

The refrigerant circulation path 32 is a path for circulating a refrigerant (for example, a fluorocarbon-based refrigerant). The compressor 34 is a compressor that compresses the refrigerant to increase the temperature and pressure. The hot water supply water heat exchanger 36 is a heat exchanger that exchanges heat between the refrigerant in the refrigerant circulation path 32 and the hot water supply water in the tank circulation path 18. The hot water supply water heat exchanger 36 functions as a condenser in the heat pump unit 30. The first expansion valve 38 is an expansion valve that reduces the pressure of the refrigerant to a low temperature and a low pressure. The opening degree of the first expansion valve 38 can be adjusted. The opening degree of the first expansion valve 38 is adjusted between a fully closed state in which the refrigerant cannot pass, a control state in which the refrigerant can be depressurized, and a fully open state in which the refrigerant passes without decompression. can do. The first check valve 40 is provided in parallel with the first expansion valve 38. The first check valve 40 does not allow the refrigerant flowing in the direction from the second four-way valve 62 toward the outside air heat exchanger 44 to pass through, but allows the refrigerant flowing in the direction from the outside air heat exchanger 44 toward the second four-way valve 62 to pass through. ..

The second expansion valve 42 is provided between the outside air heat exchanger 44 and the bathtub water heat exchanger 48. The second expansion valve 42 is also an expansion valve similar to the first expansion valve 38. The outside air heat exchanger 44 is a heat exchanger that exchanges heat between the refrigerant in the refrigerant circulation path 32 and the outside air. The outside air heat exchanger 44 functions as an evaporator in the heat pump unit 30. That is, in the outside air heat exchanger 44, the refrigerant recovers heat from the outside air. The fan 46 is provided in the vicinity of the outside air heat exchanger 44, and sends wind to the outside air heat exchanger 44 from the outside. While the fan 46 is operating, the outside air heat is recovered by the outside air heat exchanger 44, but while the fan 46 is stopped, the outside air heat is hardly recovered by the outside air heat exchanger 44. ..

The bathtub water heat exchanger 48 is a heat exchanger that exchanges heat between the refrigerant in the refrigerant circulation path 32 and the bathtub water in the bathtub water circulation path 74, which will be described later. In the bathtub water heat exchanger 48, depending on the operation mode, the case where the bathtub water is heated by using the heat of the refrigerant and the case where the refrigerant is heated by using the heat of the bathtub water are switched. That is, the bathtub water heat exchanger 48 functions as both a condenser and an evaporator in the heat pump unit 30.

The bypass path 50 is a path for bypassing the second expansion valve 42 and the bathtub water heat exchanger 48. One end of the bypass path 50 (the left end in the drawing) is connected to the portion of the refrigerant circulation path 32 between the second expansion valve 42 and the outside air heat exchanger 44, and the other end (the right end in the drawing). Part) is connected to a portion of the refrigerant circulation path 32 between the bathtub water heat exchanger 48 and the second four-way valve 62. The on-off valve 52 is interposed in the bypass path 50 and is an electromagnetic valve for opening and closing the bypass path 50. The second check valve 54 is interposed in the bypass path 50, and allows the refrigerant flowing in the direction from one end to the other end of the bypass path 50 to pass through, but does not allow the refrigerant flowing in the direction from the other end to the other end to pass through. ..

The first four-way valve 60 is a four-way valve that switches the circulation path of the refrigerant in the refrigerant circulation path 32. The first four-way valve 60 connects the outlet of the compressor 34 and one end side of the hot water supply water heat exchanger 36, and also connects the other end side of the hot water supply water heat exchanger 36 and the second four-way valve 62 ( That is, when a and b in FIG. 1 are connected and c and d are connected (hereinafter referred to as "ab, cd state"), the outlet of the compressor 34 and the second four-way valve 62 In a state where both ends of the hot water supply water heat exchanger 36 are connected (that is, the hot water supply water heat exchanger 36 is disconnected from the circulation path of the refrigerant) (that is, a and d in FIG. 1 are connected and b. It is possible to switch between the state in which c is connected. Hereinafter referred to as “ad, bc state”).

The second four-way valve 62 is also a four-way valve that switches the circulation path of the refrigerant in the refrigerant circulation path 32. The second four-way valve 62 connects the first four-way valve 60 and the first expansion valve 38 (and the first check valve 40), and also connects the other end of the bypass path 50 (the right end in the drawing) with the compressor. The state of connecting to the inlet side of 34 (that is, the state in which e and f in FIG. 1 are connected and g and h are connected; hereinafter referred to as "ef, gh state") and the first. 1 A state in which the four-way valve 60 and the other end of the bypass path 50 are connected, and the first expansion valve 38 (and the first check valve 40) and the inlet side of the compressor 34 are connected (that is, e in FIG. 1). It is possible to switch between a state in which h and h are connected and f and g are connected; hereinafter referred to as “e-h, f-g state”).

The bathtub unit 70 is a bath unit for heating or recovering heat from the bathtub water stored in the bathtub 72. The bathtub unit 70 includes a bathtub 72, a bathtub water circulation path 74, a bathtub pump 76, and a burner heat exchanger 78.

The bathtub 72 is a container for storing bathtub water. The bathtub water circulation path 74 is a circulation path for circulating bathtub water. The bathtub pump 76 is provided in the bathtub water circulation path 74. When the bathtub pump 76 is operated, the bathtub water is taken out from the bathtub 72, circulates in the bathtub water circulation path 74, and is returned to the bathtub 72. The burner heat exchanger 78 is a heat exchanger that exchanges heat between the bath water in the bath water circulation path 74 and the heat medium (for example, antifreeze) in the heat medium circulation path 84 of the burner unit 80 described later. ..

The burner unit 80 is a heating unit for heating bathtub water using the burner 82. The burner unit 80 includes a burner 82, a heat medium circulation path 84, and a burner pump 86. The burner 82 is a heat source machine that burns gas to generate heat. By operating the burner 82, the heat medium in the heat medium circulation path 84 can be heated. The heat medium circulation path 84 is a path for circulating the heat medium. The burner pump 86 is provided in the heat medium circulation path 84. When the burner pump 86 is operated, the heat medium in the heat medium circulation path 84 circulates.

The controller 100 is a control device that controls the operation of each component of the hot water supply system 2.

(Operation of hot water supply system 2; FIGS. 2 to 6)
Next, the operation of the hot water supply system 2 of this embodiment will be described with reference to FIGS. 2 to 6. The hot water supply system 2 can operate in four operation modes: an outside air heat storage mode (FIG. 3), a bathtub heat storage mode (FIG. 4), a reheating mode (FIG. 5), and a defrosting mode (FIG. 6). Hereinafter, each operation mode will be described.

(Outside air heat storage mode; Fig. 2, Fig. 3)
The outside air heat storage mode is an operation mode in which the hot water supply water is heated by using the outside air heat as a heat source. As shown in FIG. 2, when the operation in the outside air heat storage mode is instructed, the controller 100 operates the tank pump 20 and the compressor 34. The controller 100 does not operate the bathtub pump 76. Further, the controller 100 switches the first four-way valve 60 to the ab and cd states, and switches the second four-way valve 62 to the ef and gh states. Then, the controller 100 starts the operation of the fan 46. Further, the controller 100 adjusts the opening degree of the first expansion valve 38 to the controlled state and closes the second expansion valve 42. Then, the controller 100 opens the on-off valve 52. When each of the above processes is performed, the operation in the outside air heat storage mode is started.

FIG. 3 shows the movement of the refrigerant and the hot water supply water during the operation of the outside air heat storage mode. As shown in FIG. 3, in the heat pump unit 30, the high-temperature and high-pressure refrigerant compressed by the compressor 34 passes through the first four-way valve 60 and is supplied to the hot water supply water heat exchanger 36. In the hot water supply water heat exchanger 36, the high temperature and high pressure refrigerant exchanges heat with the hot water supply water in the tank circulation path 18. As a result, the hot water supply water is heated. The refrigerant after the heat exchange is completed by the hot water supply water heat exchanger 36 (that is, the hot water supply water is heated) passes through the first four-way valve 60 and the second four-way valve 62, and is depressurized by the first expansion valve 38. .. The low-temperature low-pressure refrigerant after the pressure is reduced by the first expansion valve 38 is supplied to the outside air heat exchanger 44. With the operation of the fan 46, heat exchange is performed between the refrigerant and the outside air in the outside air heat exchanger 44. As a result, the refrigerant recovers the heat of the outside air. The refrigerant after recovering the outside air heat by the outside air heat exchanger 44 is supplied to the compressor 34 via the bypass path 50 and the second four-way valve 62, and is compressed again by the compressor 34.

On the other hand, in the tank unit 10, as the tank pump 20 operates, low-temperature hot water is led out from the bottom of the tank 12 into the tank circulation path 18 and supplied to the hot water heat exchanger 36. As described above, in the hot water supply water heat exchanger 36, heat exchange is performed between the hot water supply water in the tank circulation path 18 and the high temperature and high pressure refrigerant, and as a result, the hot water supply water is heated to a high temperature. The hot water supply after heating is returned to the top of the tank 12. In the outside air heat storage mode, high-temperature hot water is stored in the tank 12 by repeating the above operation.

(Bathtub heat storage mode; Fig. 2, Fig. 4)
The bathtub heat storage mode is an operation mode in which the hot water is heated by using the heat of the bathtub water (hereinafter sometimes referred to as “bathtub heat”) as a heat source. In the bathtub heat storage mode, the outside air heat is not used as a heat source. As shown in FIG. 2, when the operation in the bathtub heat storage mode is instructed, the controller 100 operates the tank pump 20 and the compressor 34. The controller 100 also operates the bathtub pump 76. The controller 100 switches the first four-way valve 60 to the ab and cd states, and switches the second four-way valve 62 to the ef and gh states. Then, the controller 100 does not operate the fan 46. Further, the controller 100 adjusts the opening degree of the first expansion valve 38 to a fully open state (that is, a state in which depressurization cannot be performed) and adjusts the opening degree of the second expansion valve 42 to a control state. Further, the controller 100 closes the on-off valve 52. When each of the above processes is performed, the operation in the bathtub heat storage mode is started.

FIG. 4 shows the movement of the refrigerant, the hot water supply water, and the bathtub water during the operation of the bathtub heat storage mode. As shown in FIG. 4, in the heat pump unit 30, the high-temperature and high-pressure refrigerant compressed by the compressor 34 passes through the first four-way valve 60 and is supplied to the hot water supply water heat exchanger 36. In the hot water supply water heat exchanger 36, the high temperature and high pressure refrigerant exchanges heat with the hot water supply water in the tank circulation path 18. As a result, the hot water supply water is heated. The refrigerant after the heat exchange is completed by the hot water supply water heat exchanger 36 (that is, the hot water supply water is heated) passes through the first four-way valve 60, the second four-way valve 62, the first expansion valve 38, and the outside air heat exchanger 44. Then, the pressure is reduced by the second expansion valve 42. At this time, since the opening degree of the first expansion valve 38 is fully open, the first expansion valve 38 does not reduce the pressure. Further, since the fan 46 is stopped, the outside air heat is hardly recovered in the outside air heat exchanger 44. The low-temperature low-pressure refrigerant after the pressure is reduced by the second expansion valve 42 is supplied to the bathtub water heat exchanger 48. In the bathtub water heat exchanger 48, heat exchange is performed between the refrigerant and the bathtub water. As a result, the refrigerant recovers the heat of the bathtub. The refrigerant after the bathtub heat is recovered by the bathtub water heat exchanger 48 is supplied to the compressor 34 via the second four-way valve 62, and is compressed again by the compressor 34.

On the other hand, in the tank unit 10, as the tank pump 20 operates, low-temperature hot water is led out from the bottom of the tank 12 into the tank circulation path 18 and supplied to the hot water heat exchanger 36. As described above, in the hot water supply water heat exchanger 36, heat exchange is performed between the hot water supply water in the tank circulation path 18 and the high temperature and high pressure refrigerant, and as a result, the hot water supply water is heated to a high temperature. The hot water supply after heating is returned to the top of the tank 12.

Then, in the bathtub unit 70, as the bathtub pump 76 is operated, the bathtub water is drawn out from the bathtub 72 and circulates in the bathtub water circulation path 74. The bathtub water circulating in the bathtub water circulation path 74 exchanges heat with the refrigerant when passing through the bathtub water heat exchanger 48. As a result, the bath water is deprived of heat by the refrigerant and becomes cold. The cold bath water is returned to the bath 72. By repeating this operation, the heat of the bathtub water in the bathtub 72 is sequentially recovered, and the high-temperature hot water supplied heated by the bathtub heat is stored in the tank 12.

As shown in the explanation in FIG. 2, the controller 100 operates the burner 82 and the burner pump 86 as necessary under the circumstances where the hot water supply water cannot be sufficiently heated by the heat of the bathtub. Can be done. As a result, as shown in FIG. 4, the heat medium circulates in the heat medium circulation path 84, and the heat medium is heated by the burner 82. As a result, heat exchange is performed between the high-temperature heat medium and the bath water in the burner heat exchanger 78, and the bath water is heated. The heat of the heated bathtub water is given to the refrigerant by heat exchange with the refrigerant in the bathtub water heat exchanger 48. That is, in this embodiment, the hot water supply water can be heated by using the burner 82 as an auxiliary heat source machine, if necessary, while the operation is performed in the bathtub water storage mode.

(Reheating mode; Fig. 2, Fig. 5)
The reheating mode is an operation mode in which the heat of the bathtub is heated by using the heat of the outside air as a heat source. As shown in FIG. 2, when the operation in the reheating mode is instructed, the controller 100 operates the bathtub pump 76 and the compressor 34. The controller 100 does not operate the tank pump 20. Further, the controller 100 switches the first four-way valve 60 to the a-d and bc states, and switches the second four-way valve 62 to the e-h and f-g states. Then, the controller 100 starts the operation of the fan 46. Further, the controller 100 adjusts the opening degree of the first expansion valve 38 to the fully open state and adjusts the opening degree of the second expansion valve 42 to the controlled state. Then, the controller 100 closes the on-off valve 52. When each of the above processes is performed, the operation in the reheating mode is started.

FIG. 5 shows the movement of the refrigerant and the bath water during the reheating mode operation. As shown in FIG. 5, in the heat pump unit 30, the high-temperature and high-pressure refrigerant compressed by the compressor 34 passes through the first four-way valve 60 and the second four-way valve 62 and is supplied to the bathtub water heat exchanger 48. Will be done. In the bathtub water heat exchanger 48, the high-temperature and high-pressure refrigerant exchanges heat with the bathtub water in the bathtub water circulation path 74. This heats the bathtub water. The refrigerant after the heat exchange is completed in the bathtub water heat exchanger 48 (that is, the bathtub water is heated) is depressurized by the second expansion valve 42. The low-temperature low-pressure refrigerant after the pressure is reduced by the second expansion valve 42 is supplied to the outside air heat exchanger 44. With the operation of the fan 46, heat exchange is performed between the refrigerant and the outside air in the outside air heat exchanger 44. As a result, the refrigerant recovers the heat of the outside air. The refrigerant after recovering the outside air heat by the outside air heat exchanger 44 is supplied to the compressor 34 via the first expansion valve 38 (and the first check valve 40) and the second four-way valve 62, and is again supplied to the compressor. It is compressed at 34. At this time, since the first expansion valve 38 is in the fully open state as described above, the refrigerant is not depressurized by the first expansion valve 38.

On the other hand, in the bathtub unit 70, as the bathtub pump 76 operates, the bathtub water is drawn out from the bathtub 72 and circulates in the bathtub water circulation path 74. The bathtub water circulating in the bathtub water circulation path 74 exchanges heat with a high-temperature and high-pressure refrigerant when passing through the bathtub water heat exchanger 48. As a result, the bath water is heated to a high temperature. The hot bath water after heating is returned to the bath 72. By repeating this operation, the high-temperature bathtub water heated by the heat of the outside air is stored in the bathtub 72. Then, the temperature of the bathtub water in the bathtub 72 rises.

As shown in the explanation in FIG. 2, the controller 100 operates the burner 82 and the burner pump 86 as necessary under the circumstances where the bath water cannot be sufficiently heated by the outside air heat. Can be done. As a result, as shown in FIG. 5, the heat medium circulates in the heat medium circulation path 84, and the heat medium is heated by the burner 82. As a result, heat exchange is performed between the high-temperature heat medium and the bath water in the burner heat exchanger 78, and the bath water is heated. That is, in this embodiment, the bathtub water can be heated by using the burner 82 as an auxiliary heat source machine, if necessary, while the operation is performed in the reheating mode.

(Defrost mode; Fig. 2, Fig. 6)
The defrosting mode is an operation mode for melting and removing frost on the surface of the outside air heat exchanger 44 as a result of continuous recovery of the outside air heat in the outside air heat exchanger 44. Is. The defrosting mode is started, for example, when the temperature of the outside air heat exchanger 44 drops below a predetermined threshold value. As shown in FIG. 2, when the operation in the defrost mode is instructed, the controller 100 operates the compressor 34. In this case, the controller 100 does not operate the tank pump 20, the bathtub pump 76, and the fan 46. Further, the controller 100 switches the first four-way valve 60 to the a-d and bc states, and switches the second four-way valve 62 to the ef and gh states. Further, the controller 100 adjusts the opening degree of the first expansion valve 38 to the fully open state and closes the second expansion valve 42. Then, the controller 100 opens the on-off valve 52. When each of the above processes is performed, the operation in the defrost mode is started.

FIG. 6 shows the movement of the refrigerant during the operation in the defrost mode. As shown in FIG. 6, in the heat pump unit 30, the high-temperature and high-pressure refrigerant compressed by the compressor 34 passes through the first four-way valve 60, the second four-way valve 62, and the first expansion valve 38 to the outside air. It is supplied to the heat exchanger 44. Since the first expansion valve 38 is in the fully open state, depressurization is not performed. By supplying the high temperature and high pressure refrigerant to the outside air heat exchanger 44, the temperature of the outside air heat exchanger 44 rises, and the frost adhering to the outside of the outside air heat exchanger 44 is melted. The refrigerant that has become cold due to the melting of frost in the outside air heat exchanger 44 passes through the bypass path 50, is supplied to the compressor 34 via the second four-way valve 62, and is compressed again by the compressor 34. .. By repeating the above operation, the frost adhering to the outside air heat exchanger 44 is removed.

As shown in the explanation in FIG. 2, when the bathtub water should be heated (that is, reheated) at the same time during the operation in the defrosting mode, the controller 100 uses the bathtub pump 76, the burner 82, and the burner pump. The 86 can be further activated. As shown in FIG. 6, with the operation of the bathtub pump 76, the bathtub water circulates in the bathtub water circulation path 74. Then, as the burner pump 86 operates, the heat medium circulates in the heat medium circulation path 84. Then, the burner 82 heats the heat medium circulating in the heat medium circulation path 84. As a result, in the burner heat exchanger 78, heat exchange is performed between the high-temperature heat medium and the bath water, and the bath water is heated. That is, in this embodiment, the bathtub water can be heated by using the burner 82 as an auxiliary heat source machine, if necessary, while the operation is performed in the defrosting mode.

The configuration and operation contents of the hot water supply system 2 of this embodiment have been described above. As described above, in the present embodiment, the refrigerant circulation path is compressed by the compressor 34 by the first four-way valve 60, and the refrigerant is supplied to the hot water supply water heat exchanger 36 (that is, ab, The cd state (see FIGS. 3 and 4), which may be rephrased as the “hot water heating state”) and the refrigerant after being compressed by the compressor 34 are not supplied to the hot water heat exchanger 36. , The state of being supplied to the bath water heat exchanger 48 (that is, the a-d, bc state (see FIG. 5), which may be rephrased as the "bath water heating state") can be switched. Therefore, in the reheating mode operation, the first four-way valve 60 is switched to the bath water heating state, and as shown in FIG. 5, the refrigerant after being heated by the compressor 34 is the hot water supply water heat exchanger. It is supplied to the bath water heat exchanger 48 without being supplied to 36. That is, according to the hot water supply system 2 of the present embodiment, heat dissipation loss in the hot water supply water heat exchanger 36 does not occur during the operation in the reheating mode. Therefore, when the bath heat should be heated using the outside air heat (that is, when the reheating mode should be operated), the high-temperature refrigerant after being compressed by the compressor passes through the hot water supply heat exchanger. Sufficient heat can be supplied to the tub water as compared with the conventional hot water supply system supplied to the tub water heat exchanger. Therefore, according to the hot water supply system 2 of the present embodiment, when the bathtub heat should be heated by using the outside air heat, the bathtub heat can be heated more efficiently than in the conventional case.

In the hot water supply system 2 of the present embodiment, the first four-way valve 60 is in the ab, cd state (may be referred to as the "first state") and the ad, bc state ("second state"). By switching between "state" and "state"), the above-mentioned hot water supply water heating state and bathtub water heating state can be switched. Therefore, the hot water supply system 2 can switch between the hot water supply water heating state and the bathtub water heating state by using a relatively simple configuration.

Further, in the hot water supply system 2 of the present embodiment, the hot water supply mode in which the hot water supply water in the tank 12 is heated by switching the path for circulating the refrigerant (see FIG. 4) and the outside air heat are generated. Both of the outside air heat storage mode (see FIG. 3) for heating the hot water supply water in the tank 12 can be executed. According to the hot water supply system 2 of this embodiment, the hot water supply water can be heated by using various heat sources.

Further, the hot water supply system 2 of the present embodiment includes a burner unit 80 for heating the bathtub water circulating in the bathtub water circulation path 74 by utilizing the heat of the burner 82. Generally, the amount of heat generated by burning a gas per unit time is larger than the amount of heat per unit time of the outside air heat recovered from the outside air. Therefore, as shown in FIG. 5, if the burner 82 and the burner pump 86 are operated at the same time to heat the bathtub water while the hot water supply system 2 is operating in the reheating mode, only the outside air heat is used as the heat source. The bath water can be heated to a desired temperature in a short period of time as compared with the conventional configuration in which the bath water is heated. Therefore, according to the hot water supply system 2 of the present embodiment, when the bathtub water should be heated, the bathtub water can be heated to a desired temperature in a shorter period of time as compared with the conventional case.

Further, in this embodiment, as shown in FIG. 6, by operating the hot water supply system 2 in the defrosting mode, it is possible to supply a high-temperature refrigerant to the outside air heat exchanger 44 to remove the frost. During this period, the bathtub water heat exchanger 48 cannot be supplied with a high-temperature refrigerant, but by operating the bathtub pump 76, the burner 82, and the burner pump 86 at the same time, the bathtub water can be defrosted even during defrosting. Heating (ie, reheating) can be performed.

Further, in the present embodiment, if the burner 82 and the burner pump 86 are operated at the same time to heat the bathtub water while the hot water supply system 2 is operating in the bathtub heat storage mode, the bathtub water heated by the burner 82 is heated. It is also possible to heat the hot water supply water in the tank 12 by using the heat of. The hot water supply water in the tank 12 can be heated in a shorter period of time.

(Second Example; FIGS. 7 to 12)
With reference to FIGS. 7 to 12, the points different from those of the first embodiment will be mainly described. As shown in FIG. 7, the hot water supply system 102 of the present embodiment has a circuit configuration in which the heat pump unit 130 includes a hot water supply water heat exchanger 36 and a bath water heat exchanger 48 in parallel. 1 Different from the embodiment. In FIG. 7, the same configuration as in the first embodiment is shown using the same reference numerals as those in FIG. 1, and the description thereof will be omitted. In this embodiment, the heat pump unit 130 includes a refrigerant circulation path 132, a compressor 34, a first branch path 132a, a second branch path 132b, a bypass path 133, a hot water supply water heat exchanger 36, and bath water. It includes a heat exchanger 48, a first four-way valve 160, a second four-way valve 162, a first expansion valve 138, a second expansion valve 142, an outside air heat exchanger 44, and a fan 46.

The refrigerant circulation path 132 is a path for circulating the refrigerant. The refrigerant circulation path 132 of the present embodiment has a first branch path 132a, a second branch path 132b, and a bypass path 133 between the downstream side of the compressor 34 and the upstream side of the first expansion valve 138. It branches into three flow paths. The first branch path 132a passes through the hot water supply water heat exchanger 36 and is a branch path for supplying the refrigerant to the hot water supply water heat exchanger 36. The second branch path 132b passes through the bathtub water heat exchanger 48 and is a branch path for supplying the refrigerant to the bathtub water heat exchanger 48. The bypass path 133 is a flow path for passing or retaining the refrigerant. The first branch road 132a, the second branch road 132b, and the bypass road 133 are provided in parallel with each other. That is, in this embodiment, the hot water supply water heat exchanger 36 and the bathtub water heat exchanger 48 are provided in parallel.

The first four-way valve 160 is provided at an upstream end portion (that is, an end portion on the compressor 34 side) of the first branch path 132a, the second branch path 132b, and the bypass path 133. The first four-way valve 160 connects the outlet side of the compressor 34 and one end side of the hot water supply water heat exchanger 36, and also connects one end side of the bathtub water heat exchanger 48 and one end side of the bypass path 133. (That is, the state in which A and B in FIG. 7 are connected and C and D are connected. Hereinafter referred to as "AB, CD state"), the outlet side of the compressor 34 and the bath water. A state in which one end side of the heat exchanger 48 is connected and one end side of the hot water supply water heat exchanger 36 and one end side of the bypass path 133 are connected (that is, A and D in FIG. 7 are connected and B is connected. And C are connected. Hereinafter, they are referred to as “AD, BC state”) and can be switched.

Further, the second four-way valve 162 is provided at the downstream end portion (that is, the end portion on the first expansion valve 138 side) of the first branch passage 132a, the second branch passage 132b, and the bypass passage 133. There is. The second four-way valve 162 connects the other end side of the hot water supply water heat exchanger 36 and the first expansion valve 138, and also connects the other end side of the bathtub water heat exchanger 48 and the other end side of the bypass path 133. (That is, the state in which E and F in FIG. 7 are connected and G and H are connected; hereinafter referred to as "EF, GH state") and the bathtub water heat exchanger 48. A state in which the other end side and the first expansion valve 138 are connected and the other end side of the hot water supply water heat exchanger 36 and the other end side of the bypass path 133 are connected (that is, E and H in FIG. 7 are connected. It is possible to switch between the state in which G and F are connected, hereinafter referred to as "EH, GF state").

The first expansion valve 138 is an expansion valve that reduces the pressure of the refrigerant to a low temperature and low pressure. The opening degree of the first expansion valve 138 can also be adjusted. The first expansion valve 138 is provided between the second four-way valve 162 and the outside air heat exchanger 44.

The second expansion valve 142 is also an expansion valve similar to the first expansion valve 138. The second expansion valve 142 is provided in the bypass path 133.

(Operation of hot water supply system 102; FIGS. 8 to 12)
Next, the operation of the hot water supply system 102 of this embodiment will be described with reference to FIGS. 8 to 12. The hot water supply system 102 of this embodiment also operates in four operation modes: an outside air heat storage mode (FIG. 9), a bathtub heat storage mode (FIG. 10), a reheating mode (FIG. 11), and a defrosting mode (FIG. 12). be able to.

(Outside air heat storage mode; Fig. 8 and Fig. 9)
The outside air heat storage mode is an operation mode in which the hot water supply water is heated by using the outside air heat as a heat source. As shown in FIG. 8, when the operation in the outside air heat storage mode is instructed, the controller 100 operates the tank pump 20 and the compressor 34. The controller 100 does not operate the bathtub pump 76. Further, the controller 100 switches the first four-way valve 160 to the AB and CD states, and switches the second four-way valve 62 to the EF and GH states. Then, the controller 100 starts the operation of the fan 46. Further, the controller 100 adjusts the opening degree of the first expansion valve 138 to the controlled state. At this time, the opening degree of the second expansion valve 142 may be in any state. When each of the above processes is performed, the operation in the outside air heat storage mode is started.

FIG. 9 shows the movement of the refrigerant and the hot water supply water during the operation of the outside air heat storage mode. As shown in FIG. 9, in the heat pump unit 130, the high-temperature and high-pressure refrigerant compressed by the compressor 34 passes through the first four-way valve 160 and is supplied to the hot water supply water heat exchanger 36. In the hot water supply water heat exchanger 36, the high temperature and high pressure refrigerant exchanges heat with the hot water supply water in the tank circulation path 18. As a result, the hot water supply water is heated. The refrigerant after the heat exchange is completed by the hot water supply water heat exchanger 36 (that is, the hot water supply water is heated) passes through the second four-way valve 162 and is depressurized by the first expansion valve 138. The low-temperature low-pressure refrigerant after the pressure is reduced by the first expansion valve 138 is supplied to the outside air heat exchanger 44. With the operation of the fan 46, heat exchange is performed between the refrigerant and the outside air in the outside air heat exchanger 44. As a result, the refrigerant recovers the heat of the outside air. The refrigerant after recovering the outside air heat by the outside air heat exchanger 44 is supplied to the compressor 34 and is compressed again by the compressor 34.

On the other hand, in the tank unit 10, as the tank pump 20 operates, low-temperature hot water is led out from the bottom of the tank 12 into the tank circulation path 18 and supplied to the hot water heat exchanger 36. As described above, in the hot water supply water heat exchanger 36, heat exchange is performed between the hot water supply water in the tank circulation path 18 and the high temperature and high pressure refrigerant, and as a result, the hot water supply water is heated to a high temperature. The hot water supply after heating is returned to the top of the tank 12. In the outside air heat storage mode, high-temperature hot water is stored in the tank 12 by repeating the above operation.

(Bathtub heat storage mode; Fig. 8, Fig. 10)
The bathtub heat storage mode is an operation mode in which the hot water supply water is heated by using the bathtub heat as a heat source. In the bathtub heat storage mode, the outside air heat is not used as a heat source. As shown in FIG. 8, when the operation in the bathtub heat storage mode is instructed, the controller 100 operates the tank pump 20 and the compressor 34. The controller 100 also operates the bathtub pump 76. The controller 100 switches the first four-way valve 160 to the AB and CD states, and switches the second four-way valve 162 to the EH and GF states. Then, the controller 100 does not operate the fan 46. Further, the controller 100 adjusts the opening degree of the first expansion valve 138 to a fully open state (that is, a state in which depressurization cannot be performed), and adjusts the opening degree of the second expansion valve 142 to a control state. When each of the above processes is performed, the operation in the bathtub heat storage mode is started.

FIG. 10 shows the movement of the refrigerant, the hot water supply water, and the bathtub water during the operation of the bathtub heat storage mode. As shown in FIG. 10, in the heat pump unit 130, the high-temperature and high-pressure refrigerant compressed by the compressor 34 passes through the first four-way valve 160 and is supplied to the hot water supply water heat exchanger 36. In the hot water supply water heat exchanger 36, the high temperature and high pressure refrigerant exchanges heat with the hot water supply water in the tank circulation path 18. As a result, the hot water supply water is heated. The refrigerant after the heat exchange is completed by the hot water supply water heat exchanger 36 (that is, the hot water supply water is heated) passes through the second four-way valve 162, is introduced into the bypass path 133, and is depressurized by the second expansion valve 142. .. The low-temperature low-pressure refrigerant after the pressure is reduced by the second expansion valve 142 is supplied to the bathtub water heat exchanger 48 via the first four-way valve 160. In the bathtub water heat exchanger 48, heat exchange is performed between the refrigerant and the bathtub water. As a result, the refrigerant recovers the heat of the bathtub. The refrigerant after the bathtub heat is recovered by the bathtub water heat exchanger 48 passes through the second four-way valve 162, the first expansion valve 138, and the outside air heat exchanger 44 and is supplied to the compressor 34, and is supplied to the compressor 34 again by the compressor 34. It is compressed. In this case, since the first expansion valve 138 is in the fully open state, the first expansion valve 138 does not reduce the pressure. Further, since the fan 46 is stopped, the outside air heat is hardly recovered in the outside air heat exchanger 44.

On the other hand, in the tank unit 10, as the tank pump 20 operates, low-temperature hot water is led out from the bottom of the tank 12 into the tank circulation path 18 and supplied to the hot water heat exchanger 36. As described above, in the hot water supply water heat exchanger 36, heat exchange is performed between the hot water supply water in the tank circulation path 18 and the high temperature and high pressure refrigerant, and as a result, the hot water supply water is heated to a high temperature. The hot water supply after heating is returned to the top of the tank 12.

Then, in the bathtub unit 70, as the bathtub pump 76 is operated, the bathtub water is drawn out from the bathtub 72 and circulates in the bathtub water circulation path 74. The bathtub water circulating in the bathtub water circulation path 74 exchanges heat with the refrigerant when passing through the bathtub water heat exchanger 48. As a result, the bath water is deprived of heat by the refrigerant and becomes cold. The cold bath water is returned to the bath 72. By repeating this operation, the heat of the bathtub water in the bathtub 72 is sequentially recovered, and the high-temperature hot water supplied heated by the bathtub heat is stored in the tank 12.

As shown in the explanatory description in FIG. 8, also in this embodiment, the controller 100 also uses the burner 82 and the burner pump as necessary under the circumstances where the hot water supply water cannot be sufficiently heated by the heat of the bathtub. 86 can be activated. As a result, as shown in FIG. 10, the heat medium circulates in the heat medium circulation path 84, and the heat medium is heated by the burner 82. As a result, heat exchange is performed between the high-temperature heat medium and the bath water in the burner heat exchanger 78, and the bath water is heated. The heat of the heated bathtub water is given to the refrigerant by heat exchange with the refrigerant in the bathtub water heat exchanger 48. That is, also in this embodiment, the hot water supply water can be heated by using the burner 82 as an auxiliary heat source machine as needed while the operation is performed in the bathtub water storage mode.

(Reheating mode; Fig. 8 and Fig. 11)
The reheating mode is an operation mode in which the heat of the bathtub is heated by using the heat of the outside air as a heat source. As shown in FIG. 8, when the operation in the reheating mode is instructed, the controller 100 operates the bathtub pump 76 and the compressor 34. The controller 100 does not operate the tank pump 20. Further, the controller 100 switches the first four-way valve 160 to the AD and BC states, and switches the second four-way valve 162 to the EH and GF states. Then, the controller 100 starts the operation of the fan 46. Further, the controller 100 adjusts the opening degree of the first expansion valve 138 to the controlled state. The second expansion valve 142 may be in any state. When each of the above processes is performed, the operation in the reheating mode is started.

FIG. 11 shows the movement of the refrigerant and the bath water during the reheating mode operation. As shown in FIG. 11, in the heat pump unit 130, the high-temperature and high-pressure refrigerant compressed by the compressor 34 passes through the first four-way valve 160 and is supplied to the bathtub water heat exchanger 48. In the bathtub water heat exchanger 48, the high-temperature and high-pressure refrigerant exchanges heat with the bathtub water in the bathtub water circulation path 74. This heats the bathtub water. After the heat exchange is completed in the bathtub water heat exchanger 48 (that is, the bathtub water is heated), the refrigerant passes through the second four-way valve 162 and is supplied to the first expansion valve 138, and is depressurized by the first expansion valve 138. Will be done. The low-temperature low-pressure refrigerant after the pressure is reduced by the first expansion valve 138 is supplied to the outside air heat exchanger 44. With the operation of the fan 46, heat exchange is performed between the refrigerant and the outside air in the outside air heat exchanger 44. As a result, the refrigerant recovers the heat of the outside air. The refrigerant after recovering the outside air heat by the outside air heat exchanger 44 is supplied to the compressor 34 and is compressed again by the compressor 34.

On the other hand, in the bathtub unit 70, as the bathtub pump 76 operates, the bathtub water is drawn out from the bathtub 72 and circulates in the bathtub water circulation path 74. The bathtub water circulating in the bathtub water circulation path 74 exchanges heat with a high-temperature and high-pressure refrigerant when passing through the bathtub water heat exchanger 48. As a result, the bath water is heated to a high temperature. The hot bath water after heating is returned to the bath 72. By repeating this operation, the high-temperature bathtub water heated by the heat of the outside air is stored in the bathtub 72. Then, the temperature of the bathtub water in the bathtub 72 rises.

As shown in the explanation in FIG. 8, the controller 100 operates the burner 82 and the burner pump 86 as necessary under the circumstances where the bath water cannot be sufficiently heated by the outside air heat. Can be done. As a result, the heat medium circulates in the heat medium circulation path 84, and the heat medium is heated by the burner 82. As a result, heat exchange is performed between the high-temperature heat medium and the bath water in the burner heat exchanger 78, and the bath water is heated. That is, also in this embodiment, the bathtub water can be heated by using the burner 82 as an auxiliary heat source machine, if necessary, while the operation is performed in the reheating mode.

(Defrost mode; Fig. 8, Fig. 12)
The defrosting mode is an operation mode for melting and removing frost when frost adheres to the surface of the outside air heat exchanger 44. As shown in FIG. 8, when the operation in the defrost mode is instructed, the controller 100 operates the compressor 34. In this case, the controller 100 does not operate the tank pump 20, the bathtub pump 76, and the fan 46. Further, the controller 100 switches the first four-way valve 160 to the AB and CD states, and switches the second four-way valve 162 to the EF and GH states. In another example, the first four-way valve 160 may be switched to the AD and BC states, and the second four-way valve 162 may be switched to the EH and GF states. Further, the controller 100 adjusts the opening degree of the first expansion valve 138 to the fully open state. The second expansion valve 142 may be in any state. When each of the above processes is performed, the operation in the defrost mode is started.

FIG. 12 shows the movement of the refrigerant during the operation in the defrost mode. As shown in FIG. 12, in the heat pump unit 130, the high-temperature and high-pressure refrigerant compressed by the compressor 34 passes through the first four-way valve 60 and is supplied to the hot water supply water heat exchanger 36. In the hot water supply water heat exchanger 36, heat exchange is performed between the high temperature and high pressure refrigerant and the hot water supply water staying in the hot water supply water heat exchanger 36. As a result, a part of the heat of the high temperature and high pressure refrigerant is given to the hot water supply water, but the refrigerant still maintains a considerably high temperature and high pressure state. The high-temperature and high-pressure refrigerant that has passed through the hot water supply water heat exchanger 36 passes through the second four-way valve 162 and the first expansion valve 138 and is supplied to the outside air heat exchanger 44. Since the first expansion valve 138 is in the fully open state, depressurization is not performed. By supplying the high temperature and high pressure refrigerant to the outside air heat exchanger 44, the temperature of the outside air heat exchanger 44 rises, and the frost adhering to the outside of the outside air heat exchanger 44 is melted. The refrigerant whose temperature has become low due to the melting of frost in the outside air heat exchanger 44 is supplied to the compressor 34 and compressed again in the compressor 34. By repeating the above operation, the frost adhering to the outside air heat exchanger 44 is removed.

As shown in the explanatory description in FIG. 8, even in this embodiment, when the bathtub water should be heated (that is, reheated) at the same time during the operation in the defrosting mode, the controller 100 uses the bathtub pump 76. The burner 82 and the burner pump 86 can be further operated. As shown in FIG. 12, with the operation of the bathtub pump 76, the bathtub water circulates in the bathtub water circulation path 74. Then, as the burner pump 86 operates, the heat medium circulates in the heat medium circulation path 84. Then, the burner 82 heats the heat medium circulating in the heat medium circulation path 84. As a result, in the burner heat exchanger 78, heat exchange is performed between the high-temperature heat medium and the bath water, and the bath water is heated. That is, also in this embodiment, the bathtub water can be heated by using the burner 82 as an auxiliary heat source machine, if necessary, while the operation is performed in the defrosting mode.

The configuration and operation contents of the hot water supply system 102 of this embodiment have been described above. The hot water supply system 102 of the present embodiment can also exert the same effects as the hot water supply system 2 of the first embodiment.

Although the examples have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above.

(Modification 1) In each of the above embodiments, when the bathtub water should be heated (that is, reheated) at the same time during operation in the outside air heat storage mode (FIGS. 3 and 9), the controller 100 uses the bathtub. The pump 76, the burner 82, and the burner pump 86 can be further operated. In this case, the bathtub water can be heated by using the burner 82 as an auxiliary heat source machine, if necessary, while the operation is performed in the outside air heat storage mode.

(Modification 2) In each of the above embodiments, the hot water supply systems 2 and 102 include a burner heat exchanger 78 that exchanges heat between the heat medium in the heat medium circulation path 84 and the bath water in the bath water circulation path 74. However, the present invention is not limited to this, and a configuration in which the tub water in the tub water circulation path is directly heated by the combustion heat of the burner may be adopted. In that case, the bathtub water circulation path of the portion where the bathtub water is heated by the combustion heat of the burner may be an example of the “burner heat exchanger”.

The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in the present specification or drawings can achieve a plurality of purposes at the same time, and achieving one of the purposes itself has technical usefulness.

2: Hot water supply system 10: Tank unit 12: Tank 14: Water supply path 16: Hot water supply path 18: Tank circulation path 20: Tank pump 30: Heat pump unit 32: Coolant circulation path 34: Compressor 36: Hot water supply water heat exchanger 38: 1st expansion valve 40: 1st check valve 42: 2nd expansion valve 44: Outside air heat exchanger 46: Fan 48: Bath water heat exchanger 50: Bypass path 52: On-off valve 54: 2nd check valve 60: 1st four-way valve 62: 2nd four-way valve 70: Bath unit 72: Bath 74: Bath water circulation path 76: Bath pump 78: Burner heat exchanger 80: Burner unit 82: Burner 84: Heat medium circulation path 86: Burner pump 100 : Controller 102: Hot water supply system 130: Heat pump unit 132: Refrigerant circulation path 132a: First branch path 132b: Second branch path 133: Bypass path 138: First expansion valve 142: Second expansion valve 160: First four-way valve 162 : 2nd four-way valve

Claims (3)

It ’s a hot water supply system,
A tank for storing hot water and
A bathtub that stores water and a bathtub
Equipped with a heat pump unit,
The heat pump unit is
Refrigerant circulation path for circulating refrigerant and
A compressor that compresses the refrigerant and
A hot water water heat exchanger that exchanges heat between the refrigerant and the hot water supply water.
A bathtub water heat exchanger that exchanges heat between the refrigerant and the bathtub water,
An outside air heat exchanger that is connected in series with the bathtub water heat exchanger and exchanges heat between the refrigerant and the outside air.
An expansion valve that reduces the pressure of the refrigerant and
The hot water supply heating state in which the refrigerant is supplied to the hot water supply water heat exchanger after the refrigerant circulation path is compressed by the compressor, and the refrigerant after being compressed by the compressor is the hot water supply water heat. A switching unit that switches between the heated state of the tub water that is supplied to the tub water heat exchanger without being supplied to the exchanger, and
Equipped with a,
In the hot water supply heating state, the refrigerant circulates in the refrigerant circulation path in the order of the compressor, the hot water supply water heat exchanger, and the expansion valve, and then the outside air heat exchanger and the bath water heat exchanger. A hot water supply system comprising a bath heat recovery state in which the refrigerant is again supplied to the compressor via. The hot water supply system according to claim 1, wherein in the bathtub heat recovery state, the refrigerant passes through the outside air heat exchanger and circulates in the refrigerant circulation path before the bathtub water heat exchanger. The switching part includes a four-way valve and includes a four-way valve.
The four-way valve has a first state of connecting the outlet side of the compressor and one end of the hot water supply water heat exchanger, and a first state of connecting the outlet side of the compressor and one end of the bathtub water heat exchanger. It is possible to switch between 2 states,
In the hot water heating state, the four-way valve is set to the first state, and in the bathtub water heating state, the four-way valve is set to the second state.
The hot water supply system according to claim 1 or 2.

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