JP2018162944A - Hot water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technique capable of heating bathtub water more efficiently than the conventional one when the bathtub water should be heated with the usage of outside air heat.SOLUTION: A hot water supply system includes a tank for storing supply hot water, a bathtub for storing bathtub water, and a heat pump unit. The heat pump unit includes a refrigerant circulation passage for circulating a refrigerant, a compressor for compressing the refrigerant, a supply hot water heat exchanger for exchanging heat between the refrigerant and the supply hot water, a bathtub water heat exchanger for exchanging heat between the refrigerant and the bathtub water, an outside air heat exchanger for exchanging heat between the refrigerant and outside air, an expansion valve for decompressing the refrigerant, and a switching section for switching the refrigerant circulation passage between a supply hot water heating state in which the refrigerant after being compressed by the compressor is supplied to the supply hot water heat exchanger and a bathtub water heating state in which the refrigerant after being compressed by the compressor is supplied to the bathtub water heat exchanger without being supplied to the supply hot water heat exchanger.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hot water supply system.

  Patent Document 1 discloses a hot water supply system including a tank that stores hot water, a bathtub that stores bathtub water, and a heat pump unit. The heat pump unit includes a refrigerant circulation path for circulating the refrigerant, a compressor that compresses the refrigerant, a hot water supply heat exchanger that performs heat exchange between the refrigerant and the hot water, and a refrigerant and bath water. And a bathtub water heat exchanger for exchanging heat, an outdoor air heat exchanger for exchanging heat between the refrigerant and the outside air, and an expansion valve for decompressing the refrigerant. Furthermore, 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 hot water is heated using outside air heat, the switch circulates the refrigerant in the order of the compressor, the hot water supply heat exchanger, the expansion valve, and the outside air heat exchanger. (Ii) In the heat recovery mode in which hot water is heated using preheating of bathtub water, the switch is a refrigerant in the order of compressor, hot water supply heat exchanger, expansion valve, outdoor air heat exchanger, and bathtub water heat exchanger. Circulate. (Iii) In the reheating mode in which at least the bathtub water of the bathtub water and the hot water is heated using the outside air heat, the switching device includes a compressor, a hot water heat exchanger, a bathtub water heat exchanger, an expansion valve, Circulate the refrigerant in the order of the outdoor air heat exchanger.

JP 2001-91096 A

  In the hot water supply system of Patent Document 1, when the operation is performed in the reheating mode of (iii) above, the refrigerant is always a compressor, a hot water supply heat exchanger regardless of whether or not the hot water is to be heated. , Circulate in the order of bathtub water heat exchanger, expansion valve, outdoor air heat exchanger. Therefore, even in a situation where hot water is not required to be heated, the high-temperature refrigerant after being compressed by the compressor is supplied to the bathtub water heat exchanger after passing through the hot water supply heat exchanger. In the hot water supply heat exchanger, heat is exchanged between the refrigerant and the hot water staying in the hot water supply heat exchanger, so the heat supplied to the bathtub water is reduced accordingly, and the bathtub water is efficiently There may be a situation where it cannot be heated.

  In this specification, when bathtub water should be heated using external air heat, the technique which can heat bathtub water efficiently compared with the past is disclosed.

  A hot water supply system disclosed in the present specification includes a tank for storing hot water, a bathtub for storing bathtub water, and a heat pump unit. The heat pump unit circulates a refrigerant for circulating the refrigerant, and the refrigerant. A hot water supply heat exchanger that exchanges heat between the refrigerant and the hot water, a bathtub water heat exchanger that exchanges heat between the refrigerant and the bathtub water, An outdoor air heat exchanger that exchanges heat between the refrigerant and the outside air, an expansion valve that decompresses the refrigerant, and the refrigerant after being compressed by the compressor in the refrigerant circuit, the hot water supply heat exchanger Hot water supply heating state supplied to the bath water heating state supplied to the bath water heat exchanger without the refrigerant after being compressed by the compressor being supplied to the hot water supply water heat exchanger, A switching unit that switches between the two.

  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 bathtub water heat exchanger without being supplied to the hot water supply water heat exchanger. The That is, when the bathtub water is to be heated using outside air heat, no heat dissipation loss occurs in the hot water supply water heat exchanger. Therefore, when the bathtub water is to be heated using outside air heat, the conventional hot water supply in which the high-temperature refrigerant after being compressed by the compressor is supplied to the bathtub water heat exchanger via the hot water supply heat exchanger. Compared with the system, heat can be sufficiently supplied to the bathtub water. Therefore, according to said hot water supply system, when bathtub water should be heated using external air heat, bathtub water can be heated more efficiently than before.

  The switching unit preferably includes a four-way valve. The four-way valve connects the outlet side of the compressor and one end of the hot water hot water exchanger, and connects 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 in the first state in the hot water heating state, and the four-way valve is set in 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 hot water heating state and the bath water heating state can be switched by switching the four-way valve between the first state and the second state. Therefore, the hot water supply system can switch between the hot water heating state and the bath water heating state using a relatively simple configuration.

  The hot water supply heating state includes a bathtub heat recovery state in which the refrigerant circulates in the refrigerant circulation path in the order of the compressor, the hot water supply heat exchanger, the expansion valve, and the bathtub water heat exchanger. preferable.

  According to this configuration, the hot water supply system can execute an operation of heating hot water using bathtub heat.

The figure which shows typically the structure of the hot water supply system 2 of 1st Example. The table | surface explaining the state of each element in each operation mode of 1st Example. The figure which shows typically the operation | movement in the external air hot water storage mode of 1st Example. The figure which shows typically the operation | movement in the bathtub heat storage mode of 1st Example. The figure which shows typically the operation | movement in the chase mode of 1st Example. The figure which shows typically the operation | movement in the defrost mode of 1st Example. The figure which shows typically the structure of the hot water supply system 102 of 2nd Example. The table | surface explaining the state of each element in each operation mode of 2nd Example. The figure which shows typically the operation | movement in the external air hot water storage mode of 2nd Example. The figure which shows typically the operation | movement in the bathtub heat storage mode of 2nd Example. The figure which shows typically the operation | movement in the tracking mode of 2nd Example. The figure which shows typically the operation | movement in the defrost mode of 2nd Example.

(First embodiment)
(System configuration: Fig. 1)
As shown in FIG. 1, the hot water supply system 2 of the present 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 location. The tank unit 10 includes a tank 12, a water supply path 14, a hot water supply path 16, a tank circulation path 18, and a tank pump 20. The tank 12 is a sealed container that is covered with a heat insulating material on the outside and stores hot water supply water (hereinafter referred to as “hot water supply water”). The tank 12 stores hot water heated by heat exchange with the refrigerant in the hot water supply heat exchanger 36 of the heat pump unit 30. The volume of the tank 12 is 100L.

  The tank circulation path 18 is a circulation path that leads hot water from the bottom of the tank 12 and returns it to the top of the tank 12. The tank circulation path 18 passes through the hot water supply 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, hot water is sucked from the bottom of the tank 12 and sent to the hot water supply heat exchanger 36. Hot water heated to high temperature by heat exchange with the refrigerant in the hot water supply heat exchanger 36 is returned from the top of the tank 12 into the tank 12. When the hot hot water after heating flows into the tank 12, a temperature stratification is formed inside the tank 12, in which a high temperature hot water layer is stacked on a low temperature hot water layer.

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

  The heat pump unit 30 is a heating unit that absorbs heat from the outside air and heats hot water in the tank 12 and water in the bathtub 72 (hereinafter referred to as “tub water”). The heat pump unit 30 includes a refrigerant circulation path 32, a compressor 34, a hot water supply heat exchanger 36, a first expansion valve 38, a first check valve 40, a second expansion valve 42, and an outside air heat exchanger. 44, a fan 46, a bathtub water heat exchanger 48, a bypass 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 refrigerant). The compressor 34 is a compressor that compresses the refrigerant to increase the temperature and pressure. The hot water supply heat exchanger 36 is a heat exchanger that performs heat exchange between the refrigerant in the refrigerant circuit 32 and the hot water in the tank circuit 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 decompresses the refrigerant to lower the temperature and pressure. The opening degree of the first expansion valve 38 can be adjusted. The first expansion valve 38 adjusts the opening degree between a fully closed state in which the refrigerant cannot pass, a control state in which the decompression control of the refrigerant can be performed, and a fully open state in which the refrigerant is allowed to pass through without being decompressed. can do. The first check valve 40 is provided in parallel with the first expansion valve 38. The first check valve 40 does not pass the refrigerant flowing in the direction from the second four-way valve 62 toward the outside air heat exchanger 44, but allows the refrigerant flowing in the direction from the outside air heat exchanger 44 to the second four-way valve 62 to pass therethrough. .

  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 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 circuit 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 in operation, the outside air heat exchanger 44 collects outside air heat. However, while the fan 46 is stopped, the outside air heat exchanger 44 hardly collects outside air heat. .

  The bathtub water heat exchanger 48 is a heat exchanger that exchanges heat between the refrigerant in the refrigerant circuit 32 and bathtub water in a bathtub water circuit 74 described later. In the bathtub water heat exchanger 48, the case where the bathtub water is heated using the heat of the refrigerant and the case where the refrigerant is heated using the heat of the bathtub water are switched according to the operation mode. That is, the bathtub water heat exchanger 48 functions as 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 (left end portion in the figure) of the bypass passage 50 is connected to a portion of the refrigerant circulation path 32 between the second expansion valve 42 and the outside air heat exchanger 44, and the other end (right end in the figure). 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 passage 50 and is an electromagnetic valve for opening and closing the bypass passage 50. The second check valve 54 is interposed in the bypass passage 50 and allows the refrigerant flowing in the direction from one end of the bypass passage 50 to the other end to pass, but does not allow the refrigerant flowing in the direction from the other end to the one end to pass. .

  The first four-way valve 60 is a four-way valve that switches the refrigerant circulation path 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 heat exchanger 36, and connects the other end side of the hot water supply heat exchanger 36 and the second four-way valve 62 ( That is, 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. And both ends of the hot water supply heat exchanger 36 are connected (ie, the hot water supply heat exchanger 36 is removed from the refrigerant circulation path) (ie, a and d in FIG. 1 are connected and b is connected). The state in which c is connected (hereinafter referred to as “ad, bc state”) can be switched.

  The second four-way valve 62 is also a four-way valve that switches the refrigerant circulation path 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 the other end (the right end portion in the figure) of the bypass passage 50 and the compressor. 34 is connected to the inlet side (ie, the state where e and f in FIG. 1 are connected and the state where g and h are connected, hereinafter referred to as “ef, gh state”), 1 A state in which the four-way valve 60 and the other end of the bypass passage 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). And h are connected and f and g are connected (hereinafter referred to as “eh, FG state”).

  The bathtub unit 70 is a bath unit for heating the bathtub water stored in the bathtub 72 or recovering heat from the bathtub water. 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 the 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 led out from the bathtub 72, circulated in the bathtub water circulation path 74, and returned to the bathtub 72. The burner heat exchanger 78 is a heat exchanger that exchanges heat between bathtub water in the bathtub water circulation path 74 and a heat medium (for example, antifreeze liquid) in a heat medium circulation path 84 of the burner unit 80 described later. .

  The burner unit 80 is a heating unit for heating the 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 generates heat by burning gas. By operating the burner 82, the heat medium in the heat medium circuit 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 circuit 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 the hot water supply system 2; FIGS. 2 to 6)
Next, the operation of the hot water supply system 2 according to the present embodiment will be described with reference to FIGS. The hot water supply system 2 can operate in four operation modes: an outdoor heat storage mode (FIG. 3), a bath heat storage mode (FIG. 4), a reheating mode (FIG. 5), and a defrosting mode (FIG. 6). Hereinafter, each operation mode will be described.

(Outside heat storage mode; Fig. 2 and Fig. 3)
The outside air heat storage mode is an operation mode in which hot water is heated using outside air heat as a heat source. As shown in FIG. 2, when an operation in the outdoor air hot water 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. 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. The controller 100 adjusts the opening degree of the first expansion valve 38 to the control state and closes the second expansion valve 42. Then, the controller 100 opens the on-off valve 52. When the above processes are performed, the operation in the outdoor air hot water storage mode is started.

  FIG. 3 shows the movement of the refrigerant and hot water while the operation in the outdoor air hot water storage mode is performed. 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 heat exchanger 36, the high-temperature and high-pressure refrigerant exchanges heat with hot water in the tank circulation path 18. Thereby, hot water supply is heated. The refrigerant after the heat exchange in the hot water supply heat exchanger 36 (that is, the heated hot water is heated) passes through the first four-way valve 60 and the second four-way valve 62 and is decompressed by the first expansion valve 38. . The low-temperature and low-pressure refrigerant that has been decompressed by the first expansion valve 38 is supplied to the outside air heat exchanger 44. Along with the operation of the fan 46, the outside air heat exchanger 44 exchanges heat between the refrigerant and the outside air. Thereby, a refrigerant collects outside air heat. The refrigerant after the outside air heat is recovered by the outside air heat exchanger 44 is supplied to the compressor 34 via the bypass 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, with the operation of the tank pump 20, 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 supply heat exchanger 36. As described above, in the hot water supply heat exchanger 36, heat exchange is performed between the hot water in the tank circulation path 18 and the high-temperature and high-pressure refrigerant. As a result, the hot water is heated to a high temperature. The hot hot water after heating is returned to the top of the tank 12. In the outside air heat hot water storage mode, the above operation is repeated, whereby hot hot water is stored in the tank 12.

(Bath heat storage mode; Fig. 2 and Fig. 4)
The bathtub heat storage mode is an operation mode in which the hot water is heated using the heat of the bathtub water (hereinafter sometimes referred to as “bathtub heat”) as a heat source. In the bathtub heat storage mode, outside heat is not used as a heat source. As shown in FIG. 2, when an operation in the bathtub hot water 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 where pressure cannot be reduced), and adjusts the opening degree of the second expansion valve 42 to the control state. Further, the controller 100 closes the on-off valve 52. When the above processes are performed, the operation in the bathtub hot water storage mode is started.

  FIG. 4 shows the movement of the refrigerant, hot water supply, and bathtub water while the bathtub heat storage mode operation is being performed. 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 heat exchanger 36, the high-temperature and high-pressure refrigerant exchanges heat with hot water in the tank circulation path 18. Thereby, hot water supply is heated. The refrigerant after the heat exchange in the hot water supply heat exchanger 36 (that is, heating the hot water supply) 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 in a fully open state, the first expansion valve 38 is not decompressed. Further, since the fan 46 is stopped, the outside air heat is hardly collected in the outside air heat exchanger 44. The low-temperature and low-pressure refrigerant after being depressurized 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. Thereby, a refrigerant collects bathtub heat. 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, with the operation of the tank pump 20, 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 supply heat exchanger 36. As described above, in the hot water supply heat exchanger 36, heat exchange is performed between the hot water in the tank circulation path 18 and the high-temperature and high-pressure refrigerant. As a result, the hot water is heated to a high temperature. The hot hot water after heating is returned to the top of the tank 12.

  In the bathtub unit 70, the bathtub water is led out from the bathtub 72 and circulates in the bathtub water circulation path 74 with the operation of the bathtub pump 76. 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. Thereby, the bathtub water is deprived of heat by the refrigerant and becomes low temperature. The bathtub water that has become low temperature is returned to the bathtub 72. By repeating this operation, the heat of the bathtub water in the bathtub 72 is sequentially recovered, and hot hot water heated by the bathtub heat is stored in the tank 12.

  In addition, as shown in the explanatory note in FIG. 2, the controller 100 operates the burner 82 and the burner pump 86 as necessary under circumstances where the hot water supply cannot be sufficiently heated by the bath heat. Can do. 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. Thereby, heat exchange is performed between the hot 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 the present embodiment, hot water can be heated using the burner 82 as an auxiliary heat source unit as needed while the operation is performed in the bath water hot water storage mode.

(Chance mode; Fig. 2 and Fig. 5)
The reheating mode is an operation mode in which the heat of the bathtub is heated using outside air heat 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. In addition, the controller 100 switches the first four-way valve 60 to the ad and bc states and switches the second four-way valve 62 to the eh and fg 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 control state. Then, the controller 100 closes the on-off valve 52. When the above processes are performed, the driving in the chasing mode is started.

  FIG. 5 shows the movement of the refrigerant and the bath water while the operation in the reheating mode is performed. 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. Is 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. Thereby, bathtub water is heated. The refrigerant after the heat exchange is completed in the bathtub water heat exchanger 48 (that is, the bathtub water is heated) is decompressed by the second expansion valve 42. The low-temperature and low-pressure refrigerant after being depressurized by the second expansion valve 42 is supplied to the outside air heat exchanger 44. Along with the operation of the fan 46, the outside air heat exchanger 44 exchanges heat between the refrigerant and the outside air. Thereby, a refrigerant collects outside air heat. The refrigerant after the outside air heat is recovered 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 again the compressor. Compressed at 34. At this time, since the first expansion valve 38 is fully opened as described above, the refrigerant is not decompressed by the first expansion valve 38.

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

  In addition, as shown in the explanatory note in FIG. 2, the controller 100 operates the burner 82 and the burner pump 86 as necessary under circumstances such as the outside water cannot sufficiently heat the bath water. Can do. Thereby, 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. Thereby, heat exchange is performed between the hot heat medium and the bath water in the burner heat exchanger 78, and the bath water is heated. In other words, in the present embodiment, the bath water can be heated by using the burner 82 as an auxiliary heat source unit as needed while the operation is performed in the reheating mode.

(Defrost mode; FIGS. 2 and 6)
The defrosting mode is an operation mode for melting and removing frost when the frost adheres to the surface of the outdoor air heat exchanger 44 as a result of the continuous recovery of the outdoor air heat in the outdoor air heat exchanger 44. It is. The defrost mode is started when, for example, the temperature of the outside air heat exchanger 44 falls below a predetermined threshold. 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. The controller 100 switches the first four-way valve 60 to the ad and bc states, and switches the second four-way valve 62 to the ef and gh states. In addition, 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 the above processes are performed, the operation in the defrosting mode is started.

  FIG. 6 shows the movement of the refrigerant during operation in the defrost mode. As shown in FIG. 6, in the heat pump unit 30, the high-temperature and high-pressure refrigerant that has been 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, and the outside air It is supplied to the heat exchanger 44. Since the first expansion valve 38 is fully opened, no pressure reduction is 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 frost attached to the outside of the outside air heat exchanger 44 is melted. The refrigerant that has become low temperature by melting frost in the outside air heat exchanger 44 passes through the bypass 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, frost attached to the outside air heat exchanger 44 is removed.

  In addition, as shown to the explanatory note in FIG. 2, when heating of bathtub water (namely, reheating) should be performed simultaneously during driving | operation in defrost mode, the controller 100 is the bathtub pump 76, the burner 82, and the burner pump. 86 can be further activated. As shown in FIG. 6, the bathtub water circulates in the bathtub water circulation path 74 with the operation of the bathtub pump 76. Then, the heat medium circulates in the heat medium circulation path 84 with the operation of the burner pump 86. Then, the heat medium circulating in the heat medium circulation path 84 is heated by the burner 82. Thereby, in the burner heat exchanger 78, heat exchange is performed between the hot heat medium and the bath water, and the bath water is heated. That is, in this embodiment, while the operation is performed in the defrosting mode, the bath water can be heated as necessary using the burner 82 as an auxiliary heat source device.

  The configuration and operation content of the hot water supply system 2 according to the present embodiment have been described above. As described above, in the present embodiment, the refrigerant after being compressed by the compressor 34 through the refrigerant circulation path by the first four-way valve 60 is supplied to the hot water supply heat exchanger 36 (that is, ab, cd state (see FIGS. 3 and 4) (may be referred to as “hot water supply heating state”) and the refrigerant compressed by the compressor 34 without being supplied to the hot water supply heat exchanger 36. The state can be switched between the state supplied to the bathtub water heat exchanger 48 (i.e., the ad and bc states (see FIG. 5), which may be referred to as the "bath water heating state"). Therefore, in the operation in the reheating mode, the first four-way valve 60 is switched to the bath water heating state, so that the refrigerant after being heated by the compressor 34 is converted into a hot water supply water heat exchanger as shown in FIG. It is supplied to the bathtub water heat exchanger 48 without being supplied to 36. That is, according to the hot water supply system 2 of the present embodiment, no heat loss occurs in the hot water supply water heat exchanger 36 during the operation in the reheating mode. Therefore, when the bathtub heat is to be heated using outside air heat (that is, when the operation in the reheating mode is to be performed), the high-temperature refrigerant after being compressed by the compressor passes through the hot water supply heat exchanger. Compared with the conventional hot water supply system supplied to the bathtub water heat exchanger, heat can be sufficiently supplied to the bathtub water. Therefore, according to the hot water supply system 2 of the present embodiment, when the bathtub heat is to be heated using the outside air heat, the bathtub heat can be heated more efficiently than in the past.

  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 called “first state”) and in the ad, bc state (“second” By switching between the “state” and the “state”, a configuration capable of switching between the hot water heating state and the bath water heating state is adopted. Therefore, the hot water supply system 2 can switch between the hot water heating state and the bath water heating state using a relatively simple configuration.

  Moreover, in the hot water supply system 2 of a present Example, by switching the path | route which circulates a refrigerant | coolant, bathtub hot water storage mode (refer FIG. 4) which heats the hot water in the tank 12 using bathtub heat, and external air heat | fever Both the outdoor heat storage mode (see FIG. 3) in which the hot water in the tank 12 is heated by use can be executed. According to the hot water supply system 2 of the present embodiment, the hot water can be heated using various heat sources.

  Furthermore, 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 using the heat of the burner 82. Generally, the amount of heat per unit time of heat generated by burning gas is larger than the amount of heat per unit time of outside air heat recovered from the outside air. Therefore, as shown in FIG. 5, while the hot water supply system 2 is operating in the reheating mode, if the burner 82 and the burner pump 86 are simultaneously operated to heat the bath water, only the outside air heat is used as the heat source. And compared with the conventional structure which heats bath water, bath water can be heated to desired temperature in a short period of time. Therefore, according to the hot water supply system 2 of the present embodiment, when the bathtub water is to be heated, the bathtub water can be heated to a desired temperature in a shorter period of time than in the past.

  Further, in this embodiment, as shown in FIG. 6, the hot water supply system 2 operates in the defrosting mode, so that a high-temperature refrigerant can be supplied to the outdoor air heat exchanger 44 to remove frost. During this time, high-temperature refrigerant cannot be supplied to the bathtub water heat exchanger 48, but the bathtub water can be operated simultaneously with the bathtub pump 76, the burner 82, and the burner pump 86, even during defrosting. Heating (ie, chasing) can be performed.

  Further, in this embodiment, when the hot water supply system 2 is operated in the bathtub hot water storage mode, if the burner 82 and the burner pump 86 are simultaneously operated to heat the bathtub water, the bathtub water heated by the burner 82 is used. It is also possible to heat the hot water in the tank 12 by using this heat. Hot water in the tank 12 can be heated in a shorter period of time.

(Second embodiment; FIGS. 7 to 12)
With reference to FIGS. 7-12, it demonstrates centering on a different point from 1st Example. 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 bathtub water heat exchanger 48 in parallel. Different from one embodiment. In FIG. 7, the same configurations as those of the first embodiment are indicated by the same reference numerals as those in FIG. In the present embodiment, the heat pump unit 130 includes the refrigerant circulation path 132, the compressor 34, the first branch path 132a, the second branch path 132b, the bypass path 133, the hot water supply water heat exchanger 36, and the bath water. The heat exchanger 48, the first four-way valve 160, the second four-way valve 162, the first expansion valve 138, the second expansion valve 142, the outside air heat exchanger 44, and the fan 46 are provided.

  The refrigerant circulation path 132 is a path for circulating the refrigerant. The refrigerant circulation path 132 of the present embodiment includes 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. Branches into three flow paths. The first branch path 132 a is a branch path that passes through the hot water supply water heat exchanger 36 and supplies refrigerant to the hot water supply water heat exchanger 36. The second branch 132 b passes through the bathtub water heat exchanger 48 and is a branch for supplying the refrigerant to the bathtub water heat exchanger 48. The bypass 133 is a channel for allowing the refrigerant to pass or stay. The first branch path 132a, the second branch path 132b, and the bypass path 133 are provided in parallel with each other. That is, in the present embodiment, the hot water supply heat exchanger 36 and the bathtub water heat exchanger 48 are provided in parallel.

  The first four-way valve 160 is provided at the upstream end of the first branch 132a, the second branch 132b, and the bypass 133 (ie, the end on the compressor 34 side). The first four-way valve 160 connects the outlet side of the compressor 34 and one end side of the hot water supply heat exchanger 36, and connects one end side of the bathtub water heat exchanger 48 and one end side of the bypass passage 133. (That is, a state where A and B in FIG. 7 are connected and C and D are connected. Hereinafter, they are 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 heat exchanger 36 and one end side of the bypass passage 133 are connected (that is, A and D in FIG. And C. (Hereinafter referred to as “AD, B-C state”).

  The second four-way valve 162 is provided at the downstream end of the first branch 132a, the second branch 132b, and the bypass 133 (that is, the end on the first expansion valve 138 side). Yes. 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 connects the other end side of the bathtub water heat exchanger 48 and the other end side of the bypass passage 133. 7 (that is, a state where E and F in FIG. 7 are connected and G and H are connected; hereinafter referred to as “EF, GH state”), the bath water heat exchanger 48 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 passage 133 are connected (that is, E and H in FIG. 7 are connected). And a state in which G and F are connected to each other (hereinafter referred to as “EH, GF state”).

  The first expansion valve 138 is an expansion valve that decompresses the refrigerant to lower the temperature and 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 an expansion valve similar to the first expansion valve 138. The second expansion valve 142 is provided in the bypass passage 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. The hot water supply system 102 of the present embodiment also operates in four operation modes: an outdoor air heat storage mode (FIG. 9), a bath 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, FIG. 9)
The outside air heat storage mode is an operation mode in which hot water is heated using outside air heat as a heat source. As shown in FIG. 8, when an operation in the outdoor air hot water 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. In addition, the controller 100 switches the first four-way valve 160 to the AB, CD state, and switches the second four-way valve 62 to the EF, GH state. Then, the controller 100 starts the operation of the fan 46. Moreover, the controller 100 adjusts the opening degree of the 1st expansion valve 138 to a control state. At this time, the opening degree of the second expansion valve 142 may be in any state. When the above processes are performed, the operation in the outdoor air hot water storage mode is started.

  FIG. 9 shows the movement of the refrigerant and hot water while the operation in the outdoor air hot water storage mode is being performed. 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 heat exchanger 36, the high-temperature and high-pressure refrigerant exchanges heat with hot water in the tank circulation path 18. Thereby, hot water supply is heated. The refrigerant after the heat exchange in the hot water supply heat exchanger 36 (that is, the heated hot water is heated) passes through the second four-way valve 162 and is decompressed by the first expansion valve 138. The low-temperature and low-pressure refrigerant that has been depressurized by the first expansion valve 138 is supplied to the outside air heat exchanger 44. Along with the operation of the fan 46, the outside air heat exchanger 44 exchanges heat between the refrigerant and the outside air. Thereby, a refrigerant collects outside air heat. The refrigerant after the outside air heat is recovered by the outside air heat exchanger 44 is supplied to the compressor 34 and is compressed by the compressor 34 again.

  On the other hand, in the tank unit 10, with the operation of the tank pump 20, 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 supply heat exchanger 36. As described above, in the hot water supply heat exchanger 36, heat exchange is performed between the hot water in the tank circulation path 18 and the high-temperature and high-pressure refrigerant. As a result, the hot water is heated to a high temperature. The hot hot water after heating is returned to the top of the tank 12. In the outside air heat hot water storage mode, the above operation is repeated, whereby hot hot water is stored in the tank 12.

(Bath heat storage mode; FIG. 8, FIG. 10)
The bathtub heat storage mode is an operation mode in which the hot water is heated using the bathtub heat as a heat source. In the bathtub heat storage mode, outside heat is not used as a heat source. As shown in FIG. 8, when the operation in the bathtub hot water 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, CD state and switches the second four-way valve 162 to the EH, GF state. Then, the controller 100 does not operate the fan 46. Furthermore, the controller 100 adjusts the opening degree of the first expansion valve 138 to a fully open state (that is, a state where pressure cannot be reduced), and adjusts the opening degree of the second expansion valve 142 to the control state. When the above processes are performed, the operation in the bathtub hot water storage mode is started.

  FIG. 10 shows the movement of the refrigerant, hot water and bathtub water while the bathtub heat storage mode operation is being performed. As shown in FIG. 10, in the heat pump unit 130, the high-temperature and high-pressure refrigerant that has been 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 heat exchanger 36, the high-temperature and high-pressure refrigerant exchanges heat with hot water in the tank circulation path 18. Thereby, hot water supply is heated. The refrigerant after heat exchange in the hot water supply heat exchanger 36 (that is, heating the hot water supply) passes through the second four-way valve 162, is introduced into the bypass passage 133, and is depressurized by the second expansion valve 142. . The low-temperature and low-pressure refrigerant after being decompressed 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. Thereby, a refrigerant collects bathtub heat. The refrigerant after recovering the bathtub heat in the bathtub water heat exchanger 48 is supplied to the compressor 34 through the second four-way valve 162, the first expansion valve 138, and the outside air heat exchanger 44, and again in the compressor 34. Compressed. In this case, since the first expansion valve 138 is fully opened, the first expansion valve 138 does not perform pressure reduction. Further, since the fan 46 is stopped, the outside air heat is hardly collected in the outside air heat exchanger 44.

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

  In the bathtub unit 70, the bathtub water is led out from the bathtub 72 and circulates in the bathtub water circulation path 74 with the operation of the bathtub pump 76. 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. Thereby, the bathtub water is deprived of heat by the refrigerant and becomes low temperature. The bathtub water that has become low temperature is returned to the bathtub 72. By repeating this operation, the heat of the bathtub water in the bathtub 72 is sequentially recovered, and hot hot water heated by the bathtub heat is stored in the tank 12.

  In addition, as shown in the explanatory note in FIG. 8, in this embodiment as well, the controller 100 performs the burner 82 and the burner pump as necessary under circumstances such that the hot water supply cannot be sufficiently heated by the bath heat. 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. Thereby, heat exchange is performed between the hot 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 the present embodiment, hot water can be heated using the burner 82 as an auxiliary heat source unit as needed while the operation is performed in the bath water storage mode.

(Chance mode; FIGS. 8 and 11)
The reheating mode is an operation mode in which the heat of the bathtub is heated using outside air heat 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. In addition, 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. Moreover, the controller 100 adjusts the opening degree of the 1st expansion valve 138 to a control state. The second expansion valve 142 may be in any state. When the above processes are performed, the driving in the chasing mode is started.

  FIG. 11 shows the movement of the refrigerant and the bath water while the operation in the reheating mode is performed. 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. Thereby, bathtub water is heated. The refrigerant after the heat exchange in the bathtub water heat exchanger 48 is finished (that is, the bathtub water is heated) 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. Is done. The low-temperature and low-pressure refrigerant that has been depressurized by the first expansion valve 138 is supplied to the outside air heat exchanger 44. Along with the operation of the fan 46, the outside air heat exchanger 44 exchanges heat between the refrigerant and the outside air. Thereby, a refrigerant collects outside air heat. The refrigerant after the outside air heat is recovered by the outside air heat exchanger 44 is supplied to the compressor 34 and is compressed by the compressor 34 again.

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

  In addition, as shown in the explanatory note in FIG. 8, the controller 100 operates the burner 82 and the burner pump 86 as necessary under circumstances such that the outside water heat cannot sufficiently heat the bath water. Can do. Thereby, the heat medium circulates in the heat medium circulation path 84 and the heat medium is heated by the burner 82. Thereby, heat exchange is performed between the hot heat medium and the bath water in the burner heat exchanger 78, and the bath water is heated. That is, also in the present embodiment, the bath water can be heated using the burner 82 as an auxiliary heat source unit as needed while the operation is performed in the reheating mode.

(Defrost mode; FIGS. 8 and 12)
The defrost mode is an operation mode for melting and removing the frost when the frost adheres to the surface of the outdoor 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. In addition, 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. Moreover, the controller 100 adjusts the opening degree of the 1st expansion valve 138 to a full open state. The second expansion valve 142 may be in any state. When the above processes are performed, the operation in the defrosting mode is started.

  FIG. 12 shows the movement of the refrigerant during operation in the defrost mode. As shown in FIG. 12, in the heat pump unit 130, the high-temperature and high-pressure refrigerant that has been 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 heat exchanger 36, heat exchange is performed between the high-temperature and high-pressure refrigerant and the hot water remaining in the hot water supply heat exchanger 36. Thereby, a part of the heat of the high-temperature and high-pressure refrigerant is given to the hot water supply, but the refrigerant still maintains the high-temperature and high-pressure state to a considerable extent. The high-temperature and high-pressure refrigerant after passing through the hot water supply 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 fully opened, no pressure reduction is 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 frost attached to the outside of the outside air heat exchanger 44 is melted. The refrigerant that has become low temperature by melting frost in the outside air heat exchanger 44 is supplied to the compressor 34 and is compressed again by the compressor 34. By repeating the above operation, frost attached to the outside air heat exchanger 44 is removed.

  Note that, as shown in the explanatory text in FIG. 8, also in this embodiment, when the bath water should be heated (ie, reheated) simultaneously during operation in the defrost mode, the controller 100 includes the bathtub pump 76, The burner 82 and the burner pump 86 can be further operated. As shown in FIG. 12, the bathtub water circulates in the bathtub water circulation path 74 with the operation of the bathtub pump 76. Then, the heat medium circulates in the heat medium circulation path 84 with the operation of the burner pump 86. Then, the heat medium circulating in the heat medium circulation path 84 is heated by the burner 82. Thereby, in the burner heat exchanger 78, heat exchange is performed between the hot heat medium and the bath water, and the bath water is heated. That is, also in the present embodiment, the bath water can be heated using the burner 82 as an auxiliary heat source unit as needed while the operation is performed in the defrosting mode.

  Heretofore, the configuration and operation details of the hot water supply system 102 of the present embodiment have been described. Also with the hot water supply system 102 of the present embodiment, the same operational effects as the hot water supply system 2 of the first embodiment can be exhibited.

  As mentioned above, although the Example was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

(Modification 1) In each of the above embodiments, when the bath water is to be heated (ie, reheated) simultaneously during operation in the outdoor air hot water storage mode (FIGS. 3 and 9), the controller 100 The pump 76, burner 82, and burner pump 86 can be further operated. In this case, the bath water can be heated by using the burner 82 as an auxiliary heat source unit as needed while the operation is performed in the outdoor air hot water storage mode.

(Modification 2) In each of the above embodiments, the hot water supply systems 2 and 102 include the burner heat exchanger 78 that exchanges heat between the heat medium in the heat medium circulation path 84 and the bathtub water in the bathtub water circulation path 74. However, it is not restricted to this, You may employ | adopt the structure which heats the bathtub water in a bathtub water circulation path directly with the combustion heat of a burner. In that case, an example of the “burner heat exchanger” may be used as the bathtub water circulation path in the portion where the bathtub water is heated by the combustion heat of the burner.

  The technical elements described in this specification or the drawings exhibit 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 technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

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: Refrigerant circulation path 34: Compressor 36: Hot water supply water heat exchanger 38: First expansion valve 40: First check valve 42: Second expansion valve 44: Outside air heat exchanger 46: Fan 48: Bath water heat exchanger 50: Bypass path 52: On-off valve 54: Second check valve 60: First four-way valve 62: Second four-way valve 70: Bathtub unit 72: Bathtub 74: Bathtub water circulation path 76: Bathtub 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 The valve 142: second expansion valve 160: first four-way valve 162: second four-way valve

Claims (3)

A hot water system,
A tank for storing hot water,
A bathtub for storing bathtub water,
With a heat pump unit,
The heat pump unit is
A refrigerant circuit for circulating the refrigerant;
A compressor for compressing the refrigerant;
A hot water supply heat exchanger for exchanging heat between the refrigerant and the hot water,
A bathtub water heat exchanger that exchanges heat between the refrigerant and the bathtub water;
An outside air heat exchanger for exchanging heat between the refrigerant and outside air;
An expansion valve for decompressing the refrigerant;
The hot water supply heating state in which the refrigerant after being compressed by the compressor is supplied to the hot water supply heat exchanger in the refrigerant circuit, and the refrigerant after being compressed by the compressor is the hot water supply heat A switching unit that switches between the bath water heating state supplied to the bath water heat exchanger without being supplied to the exchanger, and
Comprising
Hot water system. The switching unit includes a four-way valve,
The four-way valve connects the outlet side of the compressor and one end of the hot water hot water exchanger, and connects the outlet side of the compressor and one end of the bathtub water heat exchanger. 2 states can be switched,
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. The hot water supply heating state includes a bathtub heat recovery state in which the refrigerant circulates in the refrigerant circulation path in the order of the compressor, the hot water supply heat exchanger, the expansion valve, and the bathtub water heat exchanger.
The hot water supply system according to claim 1 or 2.

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