JP5099088B2 - Hot water storage water heater - Google Patents

Description

  The present invention relates to a hot water storage type hot water supply apparatus.

  In a hot water storage type hot water supply apparatus that uses hot water when necessary while boiling tap water and holding it in a hot water storage tank, for example, a hot water storage type water heater described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2009-52760). Thus, the thing provided with the heat exchanger for baths which raises the water temperature of a bathtub using the heat of the water in a hot water storage tank is proposed.

  However, in the hot water storage water heater described in Patent Document 1 (Japanese Patent Laid-Open No. 2009-52760) described above, water in the hot water storage tank is present when the bath water temperature is raised using a bath heat exchanger. The amount of heat is changing. In the chasing operation using such chasing heat exchangers, the amount of heat required depends on the user and is difficult to predict. Therefore, in the reheating using the reheating heat exchanger, the amount of heat of the hot water in the hot water storage tank may be greatly changed.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a hot water storage type hot water supply apparatus capable of minimizing fluctuations in the amount of heat of hot water in a hot water storage tank when the amount of heat of hot water in a bathtub is increased. Is to provide.

A hot water storage type hot water supply apparatus according to a first aspect of the present invention is a hot water storage type hot water supply apparatus that supplies hot water obtained by heating by a heat pump unit to a hot water storage tank and supplies the hot water to a bathtub. A circuit, a boiling pump, a recirculation circulation pump , and a control unit are provided. The reheating heat exchanging unit heats the hot water in the bathtub by exchanging heat with the hot water in the hot water storage tank. The boiling circuit has a boiling forward path extending from the vicinity of the lower end of the hot water storage tank to the heat pump unit, and a heating return path extending from the heat pump unit to the vicinity of the upper end of the hot water storage tank. The hot water in the hot water storage tank is boiled and heated by circulating between the heat pump unit. The reheating circuit has a retreating path extending from the vicinity of the upper end of the hot water storage tank to the reheating heat exchange part, and a reheating return path extending from the reheating heat exchange part to the vicinity of the lower end of the hot water storage tank. It circulates between the hot water storage tank and the reheating heat exchanger. The boiling pump is capable of adjusting the flow rate of water flowing through the boiling circuit. The recirculation circulation pump can adjust the flow rate of water flowing through the recirculation circuit. The control unit controls the boiling pump and the additional circulation pump so that the flow rate of the boiling circuit is larger than the flow rate of the additional circuit when the additional heating and the additional heating are performed simultaneously.

This hot water storage type hot water supply system uses a reheating heat exchanger by controlling the flow rate of the boiling pump and the recirculation circulation pump so that the flow rate of the boiling circuit is larger than the flow rate of the reheating circuit. Even when the temperature of the hot water in the bathtub is raised, most of the hot water returning to the hot water storage tank via the reheating return path can be boiled and directed to the outgoing path. Thereby, the fluctuation | variation of the calorie | heat amount in the downward direction of a hot water storage tank can be suppressed small. On the other hand, in the vicinity of the upper end of the hot water storage tank, the flow rate of the hot water flowing into the hot water storage tank through the boiling return path is larger than the flow rate of the hot water flowing out from the hot water storage tank through the retrace path. The decrease in the amount of heat can be suppressed even in the vicinity of the upper end of the hot water storage tank. Thereby, it becomes possible to suppress the fluctuation | variation of the calorie | heat amount of the hot water in the hot water storage tank at the time of increasing the calorie | heat amount of the hot water of a bathtub small.

  Further, in this hot water storage type hot water supply apparatus, the heating heat exchanger is used by controlling the boiling pump and the additional circulation pump so that the flow rate of the heating circuit becomes larger than the flow rate of the additional circuit. Even when the temperature of the hot water in the bathtub is raised, most of the hot water returning to the hot water storage tank via the reheating return path can be boiled and directed to the outgoing path. For this reason, the fluctuation | variation of the calorie | heat amount in the downward direction of a hot water storage tank can be suppressed small. On the other hand, in the vicinity of the upper end of the hot water storage tank, the flow rate of the hot water flowing into the hot water storage tank through the boiling return path is larger than the flow rate of the hot water flowing out from the hot water storage tank through the retrace path. The decrease in the amount of heat can be suppressed even in the vicinity of the upper end of the hot water storage tank. Thereby, it becomes possible to suppress the fluctuation | variation of the calorie | heat amount of the hot water in the hot water storage tank at the time of increasing the calorie | heat amount of the hot water of a bathtub small.

  A hot water storage type hot water supply apparatus according to a second aspect of the present invention is the hot water storage type hot water supply apparatus according to the first aspect of the present invention, further comprising a connecting pipe that connects the confluence portion of the boiling forward path and the return return path and the vicinity of the lower end of the hot water storage tank. Yes.

  This hot water storage type hot water supply apparatus has a connecting pipe, and since the boiling forward path and the additional return path are joined before being connected to the vicinity of the lower end of the hot water storage tank, it flows through the additional return path. About the hot water, it will be easy to send it out to the boil-off path by suppressing the amount of hot water flowing into the hot water storage tank. Thereby, the disturbance to the hot water storage tank can be reduced more effectively.

A hot water storage type hot water supply apparatus according to a third aspect of the present invention is a hot water storage type hot water supply apparatus that supplies hot water obtained by heating by a heat pump unit to a hot water storage tank, and supplies the hot water to the bathtub. A circuit, a connecting pipe, a boiling pump, a follow-up flow rate adjusting mechanism, a connecting pipe flow rate adjusting mechanism , and a control unit are provided. The reheating heat exchanging unit heats the hot water in the bathtub by exchanging heat with the hot water in the hot water storage tank. The boiling circuit has a boiling forward path extending from the vicinity of the lower end of the hot water storage tank to the heat pump unit, and a heating return path extending from the heat pump unit to the vicinity of the upper end of the hot water storage tank. The hot water in the hot water storage tank is boiled and heated by circulating between the heat pump unit. The reheating circuit has a retreating path extending from the vicinity of the upper end of the hot water storage tank to the reheating heat exchange part, and a reheating return path extending from the reheating heat exchange part to the vicinity of the lower end of the hot water storage tank. It circulates between the hot water storage tank and the reheating heat exchanger. The connecting pipe connects the joining portion of the boiling forward path and the follow-up return path and the vicinity of the lower end of the hot water storage tank. The boiling pump is capable of adjusting the flow rate of water flowing through the boiling circuit. The follow-up flow rate adjusting mechanism is provided in the middle of the follow-up circuit and can adjust the flow rate of the passing hot water. The connecting pipe flow rate adjusting mechanism is provided in the middle of the connecting pipe, and can adjust the flow rate of the passing hot water. The controller controls the flow rate of the boiling pump and the flow rate of the additional flow rate adjustment mechanism so that the flow rate of the boiling circuit is larger than the flow rate of the additional circuit when additional heating and boiling heating are performed simultaneously. And the flow rate in the connecting pipe flow rate adjusting mechanism .

  In this hot water storage type hot water supply device, the heating resistance is controlled so that the flow rate of the heating circuit is larger than the flow rate of the heating circuit, and the connecting pipe flow rate adjusting mechanism is closed, and the passage resistance of the heating circuit is increased. Even if the temperature of the hot water in the bathtub is increased by using the additional heat exchange unit by controlling the additional flow rate adjusting mechanism so that the temperature increases, it returns to the hot water storage tank via the additional return path. Most of the hot water can be boiled and directed to the outbound route. For this reason, the fluctuation | variation of the calorie | heat amount in the downward direction of a hot water storage tank can be suppressed small. On the other hand, in the vicinity of the upper end of the hot water storage tank, the flow rate of the hot water flowing into the hot water storage tank through the boiling return path is larger than the flow rate of the hot water flowing out from the hot water storage tank through the retrace path. The decrease in the amount of heat can be suppressed even in the vicinity of the upper end of the hot water storage tank. Thereby, it becomes possible to suppress the fluctuation | variation of the calorie | heat amount of the hot water in the hot water storage tank at the time of increasing the calorie | heat amount of the hot water of a bathtub small.

  In addition, this hot water storage type hot water supply apparatus has a connecting pipe, and the boiling return path and the additional return path are joined before being connected to the vicinity of the lower end of the hot water storage tank. The hot water flowing through the hot water tank will be less likely to flow into the hot water storage tank, making it easier to send it out to the heating path. Thereby, the disturbance to the hot water storage tank can be reduced more effectively.

A hot water storage type hot water supply apparatus according to a fourth aspect of the invention is the hot water storage type hot water supply apparatus according to any one of the first to third aspects of the invention, a bathtub water temperature detection unit that detects the temperature of the hot water in the bathtub, and a bathtub set temperature that receives the set temperature of the bathtub And a reception unit. When the detected temperature of the bathtub water temperature detection unit is lower than the set temperature by a predetermined determination temperature value or more, the control unit drives the additional circulation pump to start additional heating.

  In general, if the temperature of the hot water in the bathtub is increased when the temperature difference between the hot water in the bathtub and the set temperature is large, the amount of heat in the hot water storage tank is greatly reduced. On the other hand, in this hot water storage type hot water supply device, the temperature of the hot water in the bathtub is raised by the output of the heat pump while driving the additional circulation pump, so that the amount of heat stored in the hot water storage tank is refrained from being used. It becomes possible to suppress fluctuations in the amount of heat of hot water.

A hot water storage type hot water supply apparatus according to a fifth aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to fourth aspects of the present invention, and a bathway extending from the bathtub to the reheating heat exchanging section, and the reheating heat exchanging section to the bathtub. And a bath return circuit extending to the bath, and further includes a bath circulation circuit that circulates between the bathtub and the reheating heat exchanger.

  In this hot water storage type hot water supply apparatus, it is possible to suppress fluctuations in the amount of heat of hot water in the hot water storage tank even when a bath circulation circuit is retrofitted to an existing bath.

The hot water storage type hot water supply apparatus of the sixth aspect of the invention is the hot water storage type hot water supply apparatus of any one of the first aspect to the fifth aspect of the invention, wherein the control unit satisfies a predetermined condition in a situation where additional heating is performed. At the same time, boiling heating is started.

  This hot water storage type hot water supply device can automatically start boiling heating that is performed simultaneously with reheating when the amount of heat of hot water in the hot water storage tank has decreased under conditions where reheating is performed. become.

The hot water storage type hot water supply apparatus according to a seventh aspect of the present invention is the hot water storage type hot water supply apparatus according to the first or second aspect of the invention , wherein the control unit turns on the boiling pump as the additional circulation pump is driven to start additional heating. Drive to start boiling heating.

  This hot water storage type hot water supply apparatus can more reliably reduce disturbance applied to the hot water storage tank.

Hot water storage type hot water supply device of the eighth invention, the first invention, the second invention, in one of the hot water storage type hot water supply device according to any one of the sixth invention, the control unit, regulating the flow rate of reheating the circulating pump, the regulation of the boiling pump Follow-up control is performed so that the flow rate is 90% or more.

  This hot water storage type hot water supply device is follow-up controlled so that the adjustment flow rate of the recirculation circulation pump is 90% or more of the adjustment flow rate of the boiling pump, so that even if a load fluctuation occurs, Most of the heating load of the hot water in the bathtub in the heat exchange unit can be handled by the output of the heat pump. For this reason, even when a load fluctuation occurs, it is possible to reduce disturbance to the hot water storage tank.

A hot water storage type hot water supply apparatus according to a ninth aspect of the present invention is the hot water storage type hot water supply apparatus according to the first or second aspect of the present invention , wherein only the flow from the connecting part between the connecting pipe and the vicinity of the lower end of the hot water storage tank is directed to the joining part. Is provided.

  This hot water storage type hot water supply apparatus can more effectively suppress the inflow of hot water that has passed through the follow-up return path from the vicinity of the lower end of the hot water storage tank.

A hot water storage type hot water supply apparatus according to a tenth aspect of the present invention is the hot water storage type hot water supply apparatus according to any one of the first to ninth aspects, wherein the hot water storage tank has a cross-sectional area of 1300 cm ² or less. The internal volume of the hot water storage tank is 100 liters or more and 200 liters or less.

This hot water storage type hot water supply apparatus has a sufficient height width in a hot water storage tank having a cross-sectional area of 1300 cm ² or less and an internal volume of 100 liters or more and 200 liters or less. The temperature with the low temperature layer is difficult to mix. For this reason, it becomes easy to keep down the water temperature supplied to a heat pump unit, and it becomes possible to maintain a coefficient of performance favorably. In addition, even if the amount of heat that can be stored in a hot water storage tank with a smaller internal volume of 100 liters or more and 200 liters or less is smaller than that of conventional hot water storage tanks, it will occur in the future by holding the heat amount by suppressing the influence of disturbance on the hot water storage tank. It becomes possible to prepare for a large load.

A hot water storage type hot water supply apparatus according to an eleventh aspect of the invention is the hot water storage type hot water supply apparatus according to any one of the first to tenth aspects of the invention, wherein the working refrigerant of the heat pump unit is a carbon dioxide refrigerant.

  Since this hot water storage type hot water supply apparatus can take a larger fluctuation range of enthalpy than the conventional one in a refrigeration cycle using a carbon dioxide refrigerant, it is possible to improve the coefficient of performance.

In the hot water storage type hot water supply apparatus according to the first aspect of the present invention, it is possible to suppress the fluctuation of the heat amount of the hot water in the hot water storage tank when increasing the heat amount of the hot water in the bathtub. Moreover, it becomes possible to suppress the fluctuation | variation of the calorie | heat amount of the warm water in the hot water storage tank at the time of increasing the calorie | heat amount of the warm water of a bathtub.

In the hot water storage type hot water supply apparatus of the second invention, disturbance to the hot water storage tank can be more effectively reduced.

  In the hot water storage type hot water supply apparatus according to the third aspect of the present invention, it is possible to suppress the fluctuation of the heat quantity of the hot water in the hot water storage tank when increasing the heat quantity of the hot water in the bathtub.

In the hot water storage type hot water supply apparatus according to the fourth aspect of the present invention, it is possible to suppress the variation in the amount of heat of the hot water in the hot water storage tank while avoiding the use of the heat stored in the hot water storage tank.

In the hot water storage type hot water supply apparatus of the fifth aspect of the invention, it is possible to suppress fluctuations in the amount of heat of the hot water in the hot water storage tank even when a bath circulation circuit is retrofitted to an existing bath.

In the hot water storage type hot water supply apparatus of the sixth aspect of the invention, it becomes possible to automatically start the boiling heating performed simultaneously with the reheating.

In the hot water storage type hot water supply apparatus according to the seventh aspect of the invention, the disturbance applied to the hot water storage tank can be more reliably reduced.

In the hot water storage type hot water supply apparatus according to the eighth aspect of the present invention, it is possible to suppress disturbance to the hot water storage tank even when a load fluctuation occurs.

In the hot water storage type hot water supply apparatus of the ninth aspect of the invention, it is possible to more effectively suppress the inflow from the vicinity of the lower end of the hot water storage tank.

In the hot water storage type hot water supply apparatus of the tenth aspect of the invention, even when the amount of heat that can be stored is small, it is possible to prepare for a large load that may occur in the future by holding the amount of heat while suppressing the influence of disturbance on the hot water storage tank.

In the hot water storage type hot water supply apparatus according to the eleventh aspect , the coefficient of performance can be improved.

1 is a schematic external view of a hot water storage type hot water supply apparatus according to an embodiment of the present invention. It is a schematic block diagram of the hot water storage type hot water supply apparatus which concerns on one Embodiment of this invention. It is a flowchart of the bath automatic control which concerns on one Embodiment of this invention. It is a flowchart of the boiling-up boiling control according to an embodiment of the present invention. It is a schematic block diagram of the hot water storage type hot-water supply apparatus which concerns on a modification (A). It is a schematic block diagram of the hot water storage type hot-water supply apparatus which concerns on a modification (I).

  A hot water storage type hot water supply apparatus 100 according to an embodiment of the present invention will be described with reference to the drawings.

<Configuration of hot water storage type hot water supply apparatus 100>
In FIG. 1, the external appearance schematic of the hot water storage type hot water supply apparatus 100 which concerns on one Embodiment of this invention is shown. FIG. 2 shows a schematic configuration diagram of the hot water storage type hot water supply apparatus 100.

  The hot water storage type hot water supply device 100 is a hot water supply device for storing hot water in advance or heating the hot water in the bathtub 70 before use, and the heat pump unit 1 and the hot water storage unit 3 and their management and control. The controller 10 etc. which performs are provided.

<Heat pump unit 1>
The heat pump unit 1 can function by obtaining electric power as a heat source device for producing hot water, a refrigerant circuit 20 in which a carbon dioxide refrigerant circulates, a water heat exchanger 22, an air heat exchanger fan 24F, and various sensors. Etc. The heat pump unit 1 has an instantaneous maximum heating capacity of 4.5 kW or more, and in the present embodiment, the instantaneous maximum heating capacity is 10 kW.

  The refrigerant circuit 20 includes a compressor 21, an internal heat exchanger 26, an expansion valve 23, an air heat exchanger 24, a refrigerant pipe 22 r in the water heat exchanger 22, and a refrigerant pipe 25.

  The internal heat exchanger 26 has a high-pressure side pipe 26h and a low-pressure side pipe 26l. The internal heat exchanger 26 exchanges heat between the refrigerant flowing through the high-pressure side pipe 26h and the refrigerant flowing through the low-pressure side pipe 26l. In the internal heat exchanger 26, the refrigerant flow direction flowing through the high-pressure side pipe 26h and the refrigerant flow direction flowing through the low-pressure side pipe 26l are provided in a mutually opposing relationship.

  The refrigerant pipe 25 includes a discharge side of the compressor 21, a refrigerant pipe 22 r in the water heat exchanger 22, a high-pressure side pipe 26 h in the internal heat exchanger 26, an expansion valve 23, an air heat exchanger 24, and an internal heat exchanger 26. Each device is connected in the order of the inner low pressure side pipe 26l and the suction side of the compressor 21, and the refrigerant is circulated therein.

  The water heat exchanger 22 has a refrigerant pipe 22r and a water pipe 32w. The water heat exchanger 22 heats between the high-temperature refrigerant flowing through the refrigerant pipe 22r after being discharged by the compressor 21 of the heat pump unit 1 and the water flowing through the water pipe 32w when circulating through the hot water storage unit 3 described later. Let the exchange take place. By the heat exchange in the water heat exchanger 22, the refrigerant passing through the refrigerant pipe 22r is cooled, and at the same time, the water passing through the water pipe 32w is heated to produce hot water.

  In the air heat exchange fan 24F, the air volume of the air supplied to the air heat exchanger 24 is adjusted by the controller 10. Thereby, the evaporation capacity of the refrigerant in the air heat exchanger 24 is adjusted.

  Examples of the various sensors include sensors for detecting the temperature and pressure related to the refrigerant. For example, the suction pressure sensor 20P, the suction temperature sensor 20T, the discharge pressure sensor 21P, the discharge temperature sensor 21T, the hydrothermal refrigerant temperature sensor 22T, and the outside air A temperature sensor 23T, a post-pneumatic refrigerant temperature sensor 24T, and the like are provided so that the controller 10 can grasp the detected value. The suction pressure sensor 20P detects the refrigerant pressure that passes through the suction side of the compressor 21. The suction temperature sensor 20T detects the refrigerant temperature passing through the suction side of the compressor 21. The discharge pressure sensor 21P detects the refrigerant pressure passing through the discharge side of the compressor 21. The discharge temperature sensor 21T detects the temperature of the refrigerant passing through the discharge side of the compressor 21. The refrigerant temperature sensor 22T after the hydrothermal exchange detects the temperature of the refrigerant cooled by passing through the water heat exchanger 22. The post-air heat exchange refrigerant temperature sensor 24T detects the temperature of the refrigerant after being heated in the air heat exchanger 24.

<Hot water storage unit 3>
The hot water storage unit 3 heats and stores the water supplied via the external water supply path 81 and the tank water supply path 82 from outside such as city water by the heat obtained from the heat pump unit 1, and stores the water supply path 83 for mixing while storing it. It is an apparatus for supplying the hot water mixed via the bathtub 70 grade | etc.,. The hot water storage unit 3 includes a hot water storage tank 35, a hot water storage circuit 30, a reheating heat exchanger 5, a reheating circuit 40, a bath circuit 60, a hot water supply and hot water supply circuit 50, and the like. Although not shown here, the hot water storage tank 35 is covered with a heat insulating material formed of foamed polystyrene, foamed polyethylene or the like, so that the heat in the hot water storage tank 35 is difficult to escape. The hot water produced by the hot water storage unit 3 may be used in places other than the bathtub 70, but circuits for other uses are omitted here for the sake of brevity.

(Hot water storage tank 35)
The hot water storage tank 35 is a tank that stores hot water obtained by heat obtained from the heat pump unit 1 in advance. The hot water storage tank 35 has an internal volume of about 180 liters, a cross-sectional area of about 1100 cm ² , and a vertical length of about 165 cm.

  The hot water storage tank 35 is always filled with water and / or hot water, and a hot water temperature detection sensor 36 is provided for allowing the controller 10 to grasp the amount of hot water. This hot water temperature detection sensor 36 includes a first hot water volume detection temperature sensor T1 to a sixth hot water volume detection temperature sensor T6. The first hot water amount detection temperature sensor T1 to the sixth hot water amount detection temperature sensor T6 are arranged at predetermined intervals in order from the lower side of the hot water storage tank 35 to the upper side.

(Hot water storage circuit 30)
The hot water storage circuit 30 is a circuit for transmitting the heat obtained by the heat pump unit 1 to the water or hot water in the hot water storage tank 35, and is a boiling pipe 31, a water pipe 32 w in the water heat exchanger 22, and a boiling return. It has a pipe 33 and a boiling pump 34.

  The boiling forward pipe 31 connects the vicinity of the lower end of the hot water storage tank 35 and the upstream end of the water pipe 32 w in the water heat exchanger 22, and the tank lower end connecting pipe also used in the reheating circuit 40. 39 is included. The tank lower end connection pipe 39 extends from the lower end of the hot water storage tank 35 to a branching portion 38 between the boiling forward pipe 31 and the return return pipe 43. The boiling forward pipe 31 is provided with a hot water storage forward temperature sensor 31T for detecting the temperature of passing water or hot water.

  The boiling return pipe 33 connects the downstream end of the water pipe 32 w in the water heat exchanger 22 and the vicinity of the upper end of the hot water storage tank 35. The boiling return pipe 33 is provided with a hot water storage return temperature sensor 33T for detecting the temperature of the passing water or hot water.

  The boiling pump 34 is provided in the middle of the boiling forward pipe 31. In the hot water storage circuit 30, when the boiling pump 34 is driven in response to a command from the controller 10, the water in the hot water storage tank 35 or the hot water existing below is heated to the boiling pipe 31. The temperature is raised by passing through the water pipe 32 w in the water heat exchanger 22, and returned to the vicinity of the upper end of the hot water storage tank 35 via the boiling return pipe 33.

  As a result, the boundary between the hot water and water in the hot water storage tank 35 moves from top to bottom, and the amount of hot water in the hot water storage tank 35 increases.

(Remembrance heat exchanger 5)
The reheating heat exchanger 5 has a cooled pipe 42w through which hot water in the hot water storage tank 35 circulates and a heated pipe 63w through which hot water in the bathtub 70 circulates.

  In the reheating heat exchanger 5, the temperature of the hot water flowing through the heated pipe 63w can be increased by performing heat exchange between the hot water flowing through the cooled pipe 42w and the hot water flowing through the heated pipe 63w. it can.

(Remembrance circuit 40)
The reheating circuit 40 is a circuit on the heat supply side for further raising the temperature of the hot water in the bathtub 70 using the heat of the hot water stored in the hot water storage tank 35, and the reheating circuit 40 41, a cooled pipe 42 w in the additional heat exchanger 5, an additional return pipe 43, and an additional circulation pump 44.

  The retrace pipe 41 connects the vicinity of the upper end of the hot water storage tank 35 and the upstream end of the cooled pipe 42 w in the recirculation heat exchanger 5.

  The recirculation return pipe 43 connects the downstream end of the cooled pipe 42 w in the reheating heat exchanger 5 and the vicinity of the lower end of the hot water storage tank 35, and the tank lower end connection also used in the hot water storage circuit 30. A tube 39 is included. As described above, the tank lower end connecting pipe 39 extends from the lower end of the hot water storage tank 35 to the branching portion 38 between the boiling forward pipe 31 and the additional return pipe 43.

  The follow-up circulation pump 44 is provided in the middle of the follow-up return pipe 43.

  In the reheating circuit 40, the recirculation circulation pump 44 is driven in response to a command from the controller 10, so that the hot water existing in the hot water storage tank 35 or the hot water existing above is heated. The temperature of the hot water storage tank 35 is returned to the vicinity of the lower end of the hot water storage tank 35 through the recirculation return pipe 43 while the temperature is lowered by flowing out into the pipe 41 and passing through the cooled pipe 42 w in the reheating heat exchanger 5.

(Bath circuit 60)
The bath circuit 60 is a circuit for obtaining the heat of hot water stored in the hot water storage tank 35 via the reheating circuit 40, and includes a bath outlet pipe 61, a heated pipe 63w in the reheating heat exchanger 5, It has a bath return pipe 64, a bath connection pipe 56 that is also used in the hot water supply and hot water supply circuit 50, and a bath circulation pump 62.

  The bath outlet pipe 61 connects the adapter 71 of the bathtub 70 and the upstream end of the heated pipe 63 w in the reheating heat exchanger 5. The bath outlet pipe 61 includes a bath temperature sensor 61T that detects the temperature of passing water or hot water as the hot water temperature of the bathtub 70, and a bath water level sensor 61P that detects the water level of the bathtub 70 by detecting the passing water pressure. Is provided.

  The bath circulation pump 62 is provided in the middle of the bath outlet pipe 61. The bath water level sensor 61P can always be detected, but detection by the bath temperature sensor 61T is performed by driving the bath circulation pump 62 to pass the hot water in the bathtub 70 in the vicinity of the bath temperature sensor 61T.

  The bath return pipe 64 connects the downstream end of the heated pipe 63w in the reheating heat exchanger 5 and the end of the bath connecting pipe 56 opposite to the bathtub 70 side.

  The bath connection pipe 56 connects the downstream end of the bath return pipe 64 and the adapter 71 of the bathtub 70.

  In the bath circuit 60, the bath circulation pump 62 is driven in response to a command from the controller 10, so that the hot water in the bathtub 70 flows out to the bath outlet pipe 61, and the heated pipe 63 w in the reheating heat exchanger 5 is connected. While passing through, the temperature is raised, and the bath return pipe 64 and the bath connection pipe 56 are returned to the bathtub 70.

  Thereby, the temperature of the hot water of the external bathtub 70 can be raised, and the chasing can be performed.

(Water supply hot water supply circuit 50)
The hot water supply hot water supply circuit 50 is a circuit for supplying hot water having an appropriate temperature obtained by mixing water supplied from outside and hot water in the hot water storage tank 35 to the bathtub 70. The water supply hot water supply circuit 50 includes an external water supply path 81, a tank water supply path 82, a hot water supply pipe 51, a bath hot water supply pipe 52, a bath connection pipe 56 also used in the bath circuit 60, a mixing water supply path 83, and a hot water supply mixing valve. 84.

  The external water supply path 81 and the tank water supply path 82 guide normal temperature water supplied from outside city water or the like from the vicinity of the lower end of the hot water storage tank 35 into the hot water storage tank 35. The tank water supply path 82 is provided with a water supply temperature sensor 82T for detecting the temperature of water supplied by city water.

  The hot water outlet pipe 51 is a pipe that guides hot water present in the vicinity of the upper end of the water or hot water stored in the hot water storage tank 35 to the hot water supply mixing valve 84. The hot water outlet pipe 51 is provided with a hot water temperature sensor 51T for detecting the temperature of passing water or hot water.

  The mixing water supply channel 83 is a pipe for adjusting the temperature of hot water supplied to the bathtub 70 by mixing hot city water with hot water flowing from the vicinity of the upper end of the hot water storage tank 35 through the hot water discharge pipe 51. is there. The mixing water supply path 83 connects a connecting portion between the external water supply path 81 and the tank water supply path 82 and the hot water supply mixing valve 84.

  The hot water mixing valve 84 is provided at the mixing portion between the hot water outlet pipe 51 and the mixing water supply channel 83. This hot water mixing valve 84 receives a command from the controller 10 and mixes the amount of hot water to be guided from the vicinity of the upper end of the hot water storage tank 35 to the bathtub 70 and the amount of water passing through the mixing water supply channel 83. Can be adjusted.

  The bath hot water supply pipe 52 is a pipe for supplying hot water whose temperature is adjusted while the hot water in the hot water storage tank 35 and the mixing water supply path 83 are mixed by the hot water supply mixing valve 84 to the bathtub 70 via the bath connection pipe 56. It is.

  The upstream end of the bath connection pipe 56 is connected to the downstream end of the bath hot water supply pipe 52 and the downstream end of the bath return pipe 64, and the downstream end thereof is connected to the adapter 71 of the bathtub 70. Has been.

(Controller 10)
The controller 10 includes a set temperature reception unit 10T, a set water level reception unit 10P, a memory 11, a timer 12, a high temperature addition instruction reception unit 13, a water supply determination water level setting reception unit 17, a bath automatic operation reception unit 15, and a chasing instruction reception. A portion 16 is provided.

  The set temperature receiving unit 10T receives an input of the set temperature of the bathtub 70 from the user.

  The set water level receiving unit 10P receives an input of the set water level of the bathtub 70 from the user.

  The memory 11 stores in advance data on the water level at which the bathtub 70 starts to overflow, and information on the power charge setting for each time zone of the day. The memory 11 stores various operation history data and state data as the hot water storage type hot water supply apparatus 100 is operated.

  The timer 12 counts the time during which the predetermined operation is performed, the time during which the predetermined operation is continued, or accepts the setting input of the heat retention period from the user.

  The high temperature addition instruction receiving unit 13 is a button for receiving a predetermined instruction by being pressed by the user, and hot water having a temperature higher than the set temperature adjusted by the hot water supply mixing valve 84 when pressed by the user once (here. Is set to 60 ° C.) by a predetermined amount (in this case, 20 liters), and the control to supply the bathtub 70 by the hot water supply hot water supply circuit 50 is started.

  The water supply determination water level setting reception unit 17 can set in advance a water supply determination water level that is a water level of the bathtub 70 which is a reference for starting automatic hot water supply to the bathtub 70 by the hot water supply hot water supply circuit 50 by a user in advance. it can. The water supply determination water level received by the water supply determination water level setting reception unit 17 is used as a value corrected by the controller 10 in accordance with the temperature detected by the outside air temperature sensor 23T, as will be described later.

  The chasing instruction receiving unit 16 is a button for accepting a predetermined instruction when pressed by the user, and when the user presses the chasing instruction receiving unit 16, the temperature rising operation of the bathtub 70 using the chasing heat exchanger 5 is started. .

  The bath automatic operation reception unit 15 is a button for receiving a predetermined instruction by being pressed by the user. The bath automatic operation reception unit 15 pours hot water so that the bathtub 70 becomes a set water level at a set temperature, and has a set time (heat retention period). The heat retention control is continued so that the predetermined temperature and the predetermined water level are automatically maintained only during the period. Even during this heat retention control, if the user presses the button of the high temperature addition instruction receiving unit 13 or the user presses the button of the chasing instruction receiving unit 16, these controls are prioritized and immediately started, and the heat retaining control is performed. Even during the control, the bathtub 70 can be brought into a desired state at a timing desired by the user.

  The controller 10 grasps the amount of hot water in the hot water storage tank 35 from the values detected by the first hot water amount detection temperature sensor T1 to the sixth hot water amount detection temperature sensor T6, and the amount of hot water in the hot water storage tank 35 is greater than a predetermined amount. At the time when the amount of water is reduced, the heat pump unit 1 and the boiling pump 34 are driven to control the amount of water in the hot water storage tank 35 to be increased.

<Automatic bath control>
As shown in the flow chart of FIG. 3, the bath automatic control increases the temperature of the bathtub 70 by supplying hot water to the bathtub 70 as much as possible than the temperature increase of the bathtub 70 using the reheating heat exchanger 5. In order to be able to use many, it is control which keeps the water level which starts supply of the hot water to the bathtub 70 as low as possible.

  The controller 10 receives the water supply determination water level from the user in advance via the water supply determination water level setting reception unit 17 and stores it in the memory 11 or the like. Further, the memory 11 of the controller 10 stores the data of the heat insulation period input from the user via the timer 12.

  This bath automatic control is started when the user presses the button of the bath automatic operation reception unit 15.

  In step S11, the controller 10 starts supplying hot water adjusted by the hot water supply mixing valve 84 to the set temperature received via the set temperature receiving unit 10T to the bathtub 70 via the hot water supply hot water supply circuit 50, step The process proceeds to S12.

  In step S12, the controller 10 determines whether or not the set water level received via the set water level receiving unit 10P has been reached. If the set water level has not been reached, the process returns to step S11 and is repeated. If the set water level has been reached, the timer 12 starts counting the heat retention period and proceeds to step S13.

  In step S13, the controller 10 corrects the water supply determination water level (water level lower than the set water level) that has been received from the user in advance via the water supply determination water level setting reception unit 17 based on the temperature detected by the outside air temperature sensor 23T. Then, the corrected water supply determination water level is newly specified as the water supply determination water level, and the process proceeds to step S14.

  The water supply determination water level by the correction here is a situation in which it is difficult to radiate heat in consideration of the fact that the heat value of the hot water in the bathtub 70 is radiated more as the detected value of the outside air temperature sensor 23T is smaller (lower the outside air temperature). It is specified as a value corrected so that the situation where heat dissipation is easier than the lower value (lower water level).

  In step S <b> 14, the controller 10 determines based on the timer 12 whether the count of the heat retention period has ended. If the heat retention period has elapsed, the bath automatic control is terminated. If the heat retention period has not elapsed, the process proceeds to step S15.

  In step S15, the controller 10 grasps the water level of the bathtub 70 with the bath water level sensor 61P, and proceeds to step S16.

  In step S16, the controller 10 determines whether or not the water level of the bathtub 70 detected by the bath water level sensor 61P is equal to or lower than the set water level received via the set water level receiving unit 10P. Here, when it is not below the set water level, the process proceeds to step S17. When it is below the set water level, the process proceeds to step S20.

  In step S <b> 17, the controller 10 drives the bath circulation pump 62 to detect the bath 70 temperature by the bath temperature sensor 61 </ b> T, and then stops the bath circulation pump 62. Thereafter, the process proceeds to step S18.

  In step S18, the controller 10 determines whether the temperature of the bathtub 70 detected by the bath temperature sensor 61T is lower than the set temperature received via the set temperature receiving unit 10T. If it is not less than the set temperature, the process returns to step S14 and is repeated. If it is lower than the set temperature, the process proceeds to step S19.

  In step S <b> 19, the controller 10 causes both the recirculation circulation pump 44 and the bath circulation pump 62 to be driven simultaneously, causes the recuperation heat exchanger 5 to perform heat exchange, and sets the temperature of the warm water returning to the bathtub 70. Performs additional heat exchanging control. And it returns to step S17 and this chasing heat exchange control is continued until the temperature of the bathtub 70 reaches preset temperature.

  In step S20, the controller 10 determines whether or not the water level of the bathtub 70 detected by the bath water level sensor 61P is equal to or lower than the water supply determination water level specified in step S13. Here, when it is not below the water supply determination water level, the process returns to step S14 and is repeated. When it is below the water supply determination water level, the process proceeds to step S21.

  In step S21, the controller 10 drives the bath circulation pump 62 to detect the temperature of the bathtub 70 by the bath temperature sensor 61T, and then stops the bath circulation pump 62. Thereafter, the process proceeds to step S22.

  In step S22, the controller 10 determines whether or not the temperature of the bathtub 70 detected by the bath temperature sensor 61T is lower than the set temperature received via the set temperature receiving unit 10T. If it is not less than the set temperature, the process proceeds to step S28. When the temperature is lower than the set temperature, the process proceeds to step S23.

  In step S23, the controller 10 performs high temperature hot water control. Here, in this high temperature addition hot water control, hot water having a temperature 5 ° C. or more higher than the set temperature received by the set temperature receiving unit 10T from the user is supplied to the bathtub 70 using the hot water mixing valve 84 and the hot water supply hot water supply circuit 50. To do. Specifically, in this embodiment, only 60 liters of hot water of 60 ° C. is supplied to the bathtub 70 by one high temperature hot water control. Thereafter, the process proceeds to step S24.

  In step S24, the controller 10 determines whether or not the water level of the bathtub 70 detected by the bath water level sensor 61P is equal to or lower than the set water level received via the set water level receiving unit 10P. Here, when it is not below the set water level, the process proceeds to step S25. When the water level is lower than the set water level, the process returns to step S21, and the hot water addition hot water control is repeated until the set water level or the set temperature is reached.

  In step S <b> 25, the controller 10 drives both the recirculation circulation pump 44 and the bath circulation pump 62 at the same time, performs heat exchange in the recuperation heat exchanger 5, and sets the temperature of the hot water returning to the bathtub 70. Performs additional heat exchanging control. Then, the process proceeds to step S26.

  In step S26, the controller 10 drives the bath circulation pump 62 to detect the bath 70 temperature by the bath temperature sensor 61T, and then stops the bath circulation pump 62. Thereafter, the process proceeds to step S27.

  In step S27, the controller 10 determines whether or not the temperature of the bathtub 70 detected by the bath temperature sensor 61T is lower than the set temperature received via the set temperature receiving unit 10T. If it is not less than the set temperature, the process returns to step S14 and is repeated. When the temperature is lower than the set temperature, the process proceeds to step S25 and is repeated.

  In step S28, the controller 10 grasps the water level of the bathtub 70 with the bath water level sensor 61P, and proceeds to step S29.

  In step S29, the controller 10 determines whether or not the water level of the bathtub 70 detected by the bath water level sensor 61P is equal to or lower than the set water level received via the set water level receiving unit 10P. Here, when it is not below the set water level, the process returns to step S14 and is repeated. When it is below the set water level, the process proceeds to step S30.

  In step S30, the controller 10 uses the hot water supply mixing valve 84 and the hot water supply hot water supply circuit 50 so that the set temperature is received via the set temperature receiving unit 10T, and the hot water at the set temperature is 20 liters at a time. Addition hot water control to be performed is performed, and the process returns to step S28 and is repeated.

<Boil-up control during reheating>
As shown in the flowchart of FIG. 4, the boiling-up control is performed when the heating heat exchange control using the heating heat exchanger 5 is performed to increase the temperature of the hot water in the bathtub 70 (for example, the above step). S19, step S25, etc.) or when the temperature increase operation of the bathtub 70 using the reheating heat exchanger 5 is started by the user pressing the button of the renewal instruction receiving unit 16 to the hot water storage tank 35. In order to suppress the influence of disturbance and the like, the heat pump unit 1 and the hot water storage circuit 30 are simultaneously used. This reheating boiling control is advanced simultaneously with the above-described automatic bath control and the like by the controller 10 and is always in progress while the hot water storage hot water supply device 100 is in operation.

  In this reheating boiling control, the controller 10 determines the flow rate of the recirculation circulation pump 44 and the flow rate of the reheating pump 34 so that the recirculation amount of the hot water storage circuit 30 is larger than the recirculation amount of the reheating circuit 40. Adjust. Specifically, the controller 10 adjusts the adjustment flow rate of the recirculation circulation pump 44 so that it is 90% or more and less than 100% of the adjustment flow rate of the boiling pump 34, for example, the adjustment flow rate of the recirculation circulation pump 44. Is adjusted to 0.9 liter / min and the adjustment flow rate of the boiling pump 34 is about 1 liter / min. Hereinafter, each process will be described in order.

  In step S41, the controller 10 grasps the amount of hot water in the hot water storage tank 35. Specifically, the amount of hot water in the hot water storage tank 35 is grasped based on the temperature detected by the first hot water amount detection temperature sensor T1 to the sixth hot water amount detection temperature sensor T6. Thereafter, the process proceeds to step S42.

  In step S42, the controller 10 determines whether or not the amount of hot water in the hot water storage tank 35 is sufficient. Specifically, the controller 10 determines whether or not a detection value of a predetermined sensor among the sensors of the first hot water amount detection temperature sensor T1 to the sixth hot water amount detection temperature sensor T6 is a value equal to or lower than a predetermined temperature. to decide. When the amount of hot water in the hot water storage tank 35 is sufficient, the process proceeds to step S45. When the amount of hot water in the hot water storage tank 35 is not sufficient, the process proceeds to step S43.

  In step S43, the controller 10 operates the heat pump unit 1 and the hot water storage circuit 30 to start boiling. Here, driving of the boiling pump 34, the compressor 21, and the air heat exchange fan 24F is started. After this boiling operation is performed for a predetermined time or until the amount of heat supplied to the hot water storage tank 35 reaches a predetermined amount, the process proceeds to step S44.

  In step S44, the controller 10 stops the heat pump unit 1 and the hot water storage circuit 30, ends the boiling, returns to step S41, and repeats.

  In step S45, the controller 10 grasps whether or not the follow-up heat exchange control is started. Specifically, the controller 10 determines whether or not the reheating heat exchange control (for example, steps S19 and S25 described above) during the bath automatic control described above is performed by the user. It is determined whether or not the follow-up heat exchange control is started based on whether or not the button is pressed. Here, when it is determined that the follow-up heat exchange control is not performed, the process returns to step S41 and is repeated. When it is determined that the follow-up heat exchange control is performed, the process proceeds to step S46.

  In step S46, the controller 10 grasps the flow rate of the recirculation circulation pump 44 driven by reheating heat exchange control, and proceeds to step S47.

  In step S47, the controller 10 determines the flow rate of the boiling pump 34 based on the flow rate of the recirculation circulation pump 44 grasped in step S46. Here, the controller 10 determines that the flow rate of the boiling pump 34 is 90% of the flow rate of the recirculation circulation pump 44 grasped in step S46. Thereafter, the process proceeds to step S48.

  In step S48, the controller 10 drives the boiling pump 34 to actually start the boiling operation. Here, as in step S43, driving of the boiling pump 34, the compressor 21, and the air heat exchange fan 24F is started. Here, the controller 10 performs control so that the flow rate of the boiling pump 34 becomes 90% of the flow rate of the recirculation circulation pump 44 and the flow rate determined in step S47. In a state where the boiling operation is continued, the process proceeds to step S49.

  In step S49, the controller 10 determines whether or not the follow-up heat exchange control is stopped. Specifically, when the hot water at the set temperature is ensured by the set water level in the bathtub 70, the additional heat exchange control is stopped. Here, if the reheating heat exchange control is not stopped, the process returns to step S46, the boiling operation being performed at the same time is continued, and this process is repeated. When the follow-up heat exchange control is stopped, the process proceeds to step S50.

In step S50, the controller 10 stops the boiling operation, returns to step S41, and repeats the above-described processing. Specifically, driving of the boiling pump 34, the compressor 21, and the air heat exchange fan 24F is stopped.
<Features of this embodiment>
(1)
In the hot water storage type hot water supply apparatus 100 of the present embodiment, when the reheating heat exchanging control using the reheating heat exchanger 5 is performed by performing reheating boiling control, the heat pump unit 1 and A boiling operation using the hot water storage circuit 30 is to be performed.

  Here, since the recirculation return pipe 43 and the boil-up return pipe 31 are connected to each other at a branch portion 38 disposed outside the hot water storage tank 35, the bathtub 70 flowing through the recirculation return pipe 43. The hot water after heating the hot water is at an intermediate temperature, and when it returns to the hot water storage tank 35, the amount of hot water in the hot water storage tank 35 is reduced, or the amount of hot water in the hot water storage tank 35 is stabilized. You ca n’t keep it.

  On the other hand, in the above-described boiling-up boiling control, the controller 10 controls the flow rate of the boiling pump 34 so as to be larger than the flow rate of the additional circulation pump 44. For this reason, the intermediate temperature hot water that has flowed through the recirculation return pipe 43 to the branching portion 38 is unlikely to go to the hot water storage tank 35 side via the tank lower end connection pipe 39 and is actively guided to the boiling forward pipe 31 side. Can do. Thereby, even when the follow-up heat exchange control is performed, the disturbance generated in the hot water storage tank 35 can be suppressed as small as possible.

(2)
Moreover, since the disturbance to the hot water storage tank 35 can be suppressed as small as possible by the above-described boiling-up control, it is possible to keep as much heat as the hot water in the hot water storage tank 35 has.

  For example, in a system in which the electricity charge varies depending on the time of the day and the electricity charge is cheaper than during the daytime, the control is performed every morning so that the amount of hot water in the hot water storage tank 35 is maximized. If the reheating heat exchange control is performed at the time when the electric charge is approaching the end of the low time period, the heating operation will be performed in the subsequent time period when the electric charge is relatively high. On the other hand, in the above-described boiling heating control, even if the additional heat exchange control is performed at the time when the electricity price is approaching the end of the relatively low time zone, As the energy for raising the temperature of the hot water, not the heat of the hot water in the hot water storage tank 35 but mainly the heat directly obtained from the heat pump unit 1 can be used. Thereby, it becomes possible to respond to a request to increase the temperature of the hot water in the bathtub 70 while maintaining the heat quantity of the hot water in the hot water storage tank 35 in a desired state.

(3)
The hot water storage tank 35 of the present embodiment has an internal volume of about 180 liters, a cross-sectional area of about 1100 cm ² , a vertical length of about 165 cm, and a sufficient height, so that the upper layer portion The temperature of the high temperature layer and the low temperature layer of the lower layer are difficult to mix. For this reason, since it becomes easy to hold down the water temperature supplied to the heat pump unit 1, the coefficient of performance of the heat pump unit 1 can be maintained favorably. Further, in the hot water storage tank 35 having an internal volume of about 180 liters and smaller than the conventional hot water storage tank having an internal volume of about 370 liters, the operation of the heat pump unit 1 tends to be performed more frequently than in the past. Even so, in the heat retaining operation of the bathtub 70, the intermediate temperature layer of the hot water storage tank 35 is difficult to increase, so that the coefficient of performance can be kept good.
<Modification of the above embodiment>
(A)
In the above-described embodiment, the case where the tank lower end connection pipe 39 connects the branch portion 38 between the boiling forward pipe 31 and the follow-up return pipe 43 from the lower end of the hot water storage tank 35 has been described as an example.

  However, for the tank lower end connection pipe 39 of the above embodiment, for example, as shown in FIG. 5, a hot water storage type hot water supply apparatus provided with a check valve 237 that allows only a flow from the vicinity of the lower end of the hot water storage tank 35 toward the branch portion 38. It may be 200.

In this case, it is possible to prevent warm water having an intermediate temperature flowing to the branching portion 38 through the return return pipe 43 during the additional heat exchange control from flowing into the hot water storage tank 35 side. Can be more effectively reduced.
(B)
In the above embodiment, the case where the boiling operation is started when the reheating heat exchange control is started has been described.

However, for example, when the reheating heat exchange control is being performed, the boiling operation is not always performed. For example, in the state where the reheating heat exchange control is being performed, the flow rate of the recirculation circulation pump 44 is predetermined. You may make it drive the heat pump unit 1 and the hot water storage circuit 30 only when it becomes large so that the flow rate is exceeded. In this case, when the bath 70 requires a relatively small amount of heat, the influence of the disturbance on the hot water storage tank 35 is suppressed to be relatively small, and energy is saved by not driving the heat pump unit 1. Can be realized.
(C)
In the embodiment described above, the control for starting the additional heat exchange control when the temperature is lower than the set temperature in steps S18 and S19 of the automatic bath control has been described as an example.

  However, for example, the condition for starting the follow-up heat exchange control in step S18 described above may be a determination temperature that is a predetermined temperature lower than the set temperature or less.

  As described above, when the degree of deviation between the temperature of the bathtub 70 and the set temperature is larger, the reheating heat exchange control can be performed, and the reheating boiling control associated therewith can be started.

  If the degree of deviation between the temperature of the bathtub 70 and the set temperature is larger, if only the reheating heat exchange control is performed without performing the reheating boiling control, the intermediate temperature layer of the hot water storage tank 35 is It will increase more remarkably.

On the other hand, here, only the reheating heat exchange control is not performed, and the reheating boiling control is performed following, so that the intermediate temperature layer of the hot water storage tank 35 is remarkably increased. Such a situation can be avoided.
(D)
In the above-described embodiment, the case where the temperature of the bathtub 70 is set to the preset temperature and the reheating heat exchange control is performed is described as an example.

  However, for example, in the reheating heat exchange control, the recirculation circulation pump is configured so that the temperature of the hot water on the outlet side of the reheating heat exchanger 5 of the reheating return pipe 43 is grasped by a sensor or the like so that this temperature becomes the target temperature. While adjusting the flow rate of 44, the flow rate of the boiling pump 34 may be adjusted following this.

Thereby, when the temperature of the hot water passing through the outlet of the additional heat exchanger 5 in the additional return pipe 43 can be made as low as possible, the coefficient of performance of the heat pump unit 1 in the boiling-up boiling control is improved. It becomes possible to do.
(E)
In the above embodiment, the case where the output fluctuation of the heat pump unit 1 is arbitrary has been described as an example in the boiling-up control at the time of tracking.

However, for example, heat transfer between the refrigerant, hot water circulating in the hot water storage circuit 30 and the additional heating circuit 40, and hot water circulating in the bath circuit 60 in the entire additional heat exchanger 5 and the water heat exchanger 22. The temperature of the bathtub 70 may be set to the set temperature by adjusting the output of the heat pump unit 1 in consideration of efficiency and heat exchange capability.
(F)
In the above-described embodiment, the case where the boiling heating control is performed when the tracking heat exchange control is performed has been described as an example.

  However, for example, the boiling-up control may be performed only until the predetermined condition is satisfied after the tracking heat exchange control is started. As this condition, for example, when a predetermined time elapses after the start of the follow-up heat exchange control, or when a sensor for grasping the temperature of the hot water flowing through the follow-up return pipe 43 is provided, the detected temperature is For example, when the temperature exceeds a predetermined temperature or when the temperature detected by the bath temperature sensor 61T exceeds the predetermined temperature.

  Here, when the temperature of the hot water in the bathtub 70 is increased by the reheating heat exchanger 5 using the heat of the hot water in the hot water storage tank 35, the boiling pump 34 is stopped without performing the reheating control during reheating. Then, the hot water that has passed through the cooled pipe 42w of the reheating heat exchanger 5 passes through the reheating return pipe 43 in a state where the temperature is lowered, and is returned to the hot water storage tank 35 from below the hot water storage tank 35. . At this time, the hot water cooled by passing through the cooled pipe 42w of the additional heat exchanger 5 follows the temperature of the hot water in the bathtub 70 (from the bathtub 70 through the bath outlet pipe 61) in accordance with the principle of heat exchange. It is not cooled to a temperature lower than the temperature of the hot water flowing into the soaking heat exchanger 5. For this reason, the temperature of the hot water returned to the lower part of the hot water storage tank 35 through the reheating return pipe 43 is high temperature hot water existing near the upper end of the hot water storage tank 35 and city water supplied near the lower end of the hot water storage tank 35. It is an intermediate temperature that is between these temperatures. Thus, when the reheating heat exchange control using the reheating heat exchanger 5 is performed, the intermediate temperature layer of the hot water storage tank 35 increases. Here, generally, the coefficient of performance of the heat pump unit 1 becomes a better value as the temperature of the water supplied to the water heat exchanger 22 through the boiling forward pipe 31 is lower. However, when the reheating heat exchange control is performed without performing the reheating control at the time of reheating as described above, the intermediate temperature layer increases in the hot water storage tank 35. The temperature of the water supplied to the exchanger 22 cannot be kept low, causing a decrease in the coefficient of performance of the heat pump unit 1. Based on the above, the following control is effective.

  For example, in the state where the reheating heat exchange control is started, the temperature of the hot water in the bathtub 70 is often low, so the temperature of the hot water flowing through the bath outlet pipe 61 toward the reheating heat exchanger 5 is also low. The hot water after flowing through the reheating circuit 40 and heating the hot water from the bathtub 70 in the reheating heat exchanger 5 tends to be relatively low in temperature. As described above, when the temperature of the hot water from the recirculation return pipe 43 through the branch portion 38 to the boiling forward pipe 31 is relatively low, the above-described heat pump is performed by performing the reheating boiling control. The degree of decrease in the coefficient of performance in the unit 1 can be kept small.

  On the other hand, in a state after the start of the reheating heat exchange control, the temperature of the hot water in the bathtub 70 is gradually increased, and the hot water flowing toward the reheating heat exchanger 5 through the bath outlet pipe 61. The temperature of the hot water after flowing through the reheating circuit 40 and heating the hot water from the bathtub 70 in the reheating heat exchanger 5 is relatively low in temperature and is easy to maintain a high temperature. For this reason, when the temperature of the hot water from the follow-up return pipe 43 through the branch portion 38 to the boil-up forward pipe 31 is relatively high, if the boiling-up boiling control is performed, the heat pump unit 1 described above is performed. The coefficient of performance tends to be greatly reduced. For this reason, in a state after a start of the reheating heat exchange control, the reheating control during the reheating is stopped, the movement of the heat pump unit 1 and the hot water storage circuit 30 is stopped, and the branch portion from the reheating return pipe 43 is stopped. The hot water that has flowed toward 38 may be returned to the hot water storage tank 35 via the tank lower end connecting pipe 39. Thus, in a state after the start of the additional heat exchange control, the temperature of the hot water flowing through the additional return pipe 43 has not greatly decreased from the temperature of the hot water flowing through the additional return pipe 41. The influence of the disturbance on the tank 35 can be suppressed to a small level as compared with the start of the follow-up heat exchange control.

According to such an operation, it is possible to keep the influence of disturbance on the hot water storage tank 35 to a certain degree while keeping the coefficient of performance in the heat pump unit 1 to a certain degree.
(G)
In the above-described embodiment, the case where the output of the heat pump unit 1 is not particularly changed according to the time zone of the day has been described as an example.

  However, for example, in a system in which the electricity rate varies depending on the time zone of the day, the output of the heat pump unit 1 may be changed according to the time zone.

  For example, the heat pump unit 1 may be controlled every morning so that the hot water storage tank 35 is filled with hot water at the end of the late-night electricity rate period. Here, for example, when the output of the heat pump unit 1 remains large (for example, about 6 kilowatts), it is possible to finish boiling in a relatively short time and fill the hot water storage tank 35 with hot water. In particular, when using a hot water storage tank 35 smaller than the conventional one of 180 liters as assumed in the above embodiment, when using the output of the heat pump unit 1 similar to the conventional one, the boiling point is higher than the conventional one. It takes less time to finish raising.

  On the other hand, for example, when there is a time zone in which the electricity rate is relatively low such as at night and the user does not plan to use hot water in the hot water storage tank 35, such time In the belt, keep the output of the heat pump unit 1 small (for example, about 4.5 kilowatts) and take time so that the boiling of the hot water storage tank 35 is completed by the time immediately before the end of the midnight electricity bill time zone. You may make it boil. Thereby, it becomes possible to raise efficiency more than before. Moreover, you may make it change not only the output of the heat pump unit 1 but the boiling target temperature of the hot water storage tank 35 according to a time slot | zone, for example. It should be noted that in the time zone when hot water supply loads tend to concentrate during the daytime, the output of the heat pump unit 1 may be increased more than the output immediately before the end of the midnight power charge time.

Further, for example, in a densely populated area such as an apartment house, the heat pump unit 1 is heated by initial setting or mutual communication processing so that the operation of the heat pump unit 1 is not performed at the same time at night when the electricity rate is relatively low. A time difference may be provided in the raising operation. In this case, the heat pump unit 1 may be operated in a frequency band where the operation sound is reduced.
(H)
In the above embodiment, the case where the controller 10 grasps the flow rate of the recirculation circulation pump 44 and identifies the flow rate of the boiling pump 34 has been described as an example.

However, for example, the controller 10 grasps the flow rate of the boiling pump 34 after a predetermined time has elapsed in a state where both the additional circulation pump 44 and the boiling pump 34 are started, and performs additional circulation. You may adjust so that the flow volume of the pump 44 may become larger than the flow volume of the boiling pump 34 grasped | ascertained.
(I)
In the above embodiment, the case where the flow rate is adjusted by using two pumps of the boiling pump 34 and the additional circulation pump 44 has been described as an example.

  However, for example, as shown in FIG. 6, a hot water storage type hot water supply apparatus 300 provided with a connecting pipe flow rate adjustment valve 344 a and an additional flow rate adjustment valve 344 b may be used instead of the additional circulation pump 44 in the above embodiment. . The connecting pipe flow rate adjusting valve 344a is provided in the middle of the tank lower end connecting pipe 39, and the flow rate of the passing hot water can be changed by adjusting the valve opening degree. The follow-up flow rate adjustment valve 344b is provided in the middle of the follow-up return pipe 43 of the follow-up circuit 40, and the flow rate of the passing hot water can be changed by adjusting the valve opening.

  In this hot water storage type hot water supply apparatus 300, the heating heat exchanger 5 is used by opening the connecting pipe flow rate adjustment valve 344 a and closing the additional flow rate adjustment valve 344 b and driving the boiling pump 34. And only the boiling operation can be performed. Further, in the hot water storage type hot water supply apparatus 300, the flow resistance to pass is adjusted by adjusting the opening of the additional flow adjusting valve 344b while closing or narrowing the connecting pipe flow adjusting valve 344a, By driving the boiling pump 34, the circulating amount of the hot water storage circuit 30 can be made larger than the circulating amount of the reheating circuit 40. Thereby, it is possible to perform the follow-up heat exchange control while keeping the disturbance to the hot water storage tank 35 small, and the same effects as in the above embodiment can be obtained.

  The present invention is particularly useful when used as a hot water storage type hot water supply apparatus because it is possible to suppress the fluctuation of the heat quantity of hot water in the hot water storage tank when increasing the heat quantity of hot water in the bathtub.

1 Heat pump unit 3 Hot water storage unit 5 Reheating heat exchanger (reheating heat exchanging section)
10 Controller (control unit)
10P set water level reception unit 10T set temperature reception unit (bath set temperature reception unit)
DESCRIPTION OF SYMBOLS 11 Memory 12 Timer 16T Water supply temperature sensor 23T Outside temperature sensor 30 Hot water storage circuit (boiling circuit)
31 Boil-out path 3 3 Boil-up return path 34 Boiling pump (flow rate adjustment mechanism)
35 Hot water storage tank 38 Branch part (merging part)
39 Tank lower end connection pipe (connection pipe)
40 Tracking circuit 41 Tracking path 43 Tracking return path 44 Tracking circulation pump (flow rate adjustment mechanism)
50 Water supply and hot water supply circuit 56 Bath connection pipe (bath return path)
60 Bath circuit (Bath circulation circuit)
61 Bath way 64 Bath return 61P Bath temperature sensor 61T Bath water level sensor (bath water temperature detector)
70 Bathtub 100 Hot water storage type hot water supply device 200 Hot water storage type hot water supply device 237 Check valve (check mechanism)
300 Hot water storage type hot water supply device 344a Connection pipe flow rate adjustment valve (flow rate adjustment mechanism, additional flow rate adjustment mechanism)
344b Additional flow control valve (flow control mechanism, connecting pipe flow control mechanism)

JP 2009-52760 A

Claims (11)

A hot water storage type hot water supply device (100) for supplying hot water obtained by heating by a heat pump unit (1) to a hot water storage tank (35) and supplying it to a bathtub (70),
A reheating heat exchanging section (5) for performing heat exchange by exchanging heat between the hot water in the bathtub (70) and the hot water in the hot water storage tank (35);
A boiling forward passage (31) extending from the vicinity of the lower end of the hot water storage tank (35) to the heat pump unit (1), and a boiling extending from the heat pump unit (1) to the vicinity of the upper end of the hot water storage tank (35). And a heating return path (3 3 ), which circulates between the hot water storage tank (35) and the heat pump unit (1) to boil and heat the hot water in the hot water storage tank (35). A circuit (30);
A retreating path (41) extending from the vicinity of the upper end of the hot water storage tank (35) to the reheating heat exchanging portion (5), and a lower end of the hot water storage tank (35) from the reheating heat exchanging portion (5) A chasing return path (43) extending to the vicinity, and a chasing circuit (40) for circulating between the hot water storage tank (35) and the chasing heat exchanger (5),
A boiling pump (34) capable of adjusting a flow rate of water flowing through the boiling circuit (30);
A recirculation circulation pump (44) capable of adjusting a flow rate of water flowing through the reheating circuit (40);
When the reheating and boiling heating are performed simultaneously, the flow of the boiling pump (34) is such that the flow rate of the boiling circuit (30) is larger than the flow rate of the reheating circuit (40 ). A control unit (10) for controlling the flow rate and the recirculation circulation pump (44) ;
A hot water storage type hot water supply apparatus (100, 200 ) .   A connecting pipe (39) for connecting the confluence portion (38) of the boiling forward path (31) and the follow-up return path (43) and the vicinity of the lower end of the hot water storage tank (35);
The hot water storage type hot water supply device (100, 200) according to claim 1. A heat pump unit storage type hot water supply device for supplying the bath (70) while storing the hot water obtained by heating the hot water storage tank (35) by (1) (3 00),
A reheating heat exchanging section (5) for performing heat exchange by exchanging heat between the hot water in the bathtub (70) and the hot water in the hot water storage tank (35);
A boiling forward passage (31) extending from the vicinity of the lower end of the hot water storage tank (35) to the heat pump unit (1), and a boiling extending from the heat pump unit (1) to the vicinity of the upper end of the hot water storage tank (35). And a heating return path (3 3 ), which circulates between the hot water storage tank (35) and the heat pump unit (1) to boil and heat the hot water in the hot water storage tank (35). A circuit (30);
A retreating path (41) extending from the vicinity of the upper end of the hot water storage tank (35) to the reheating heat exchanging portion (5), and a lower end of the hot water storage tank (35) from the reheating heat exchanging portion (5) A chasing return path (43) extending to the vicinity, and a chasing circuit (40) for circulating between the hot water storage tank (35) and the chasing heat exchanger (5),
A connecting pipe (39) for connecting the confluence portion (38) of the boiling forward path (31) and the follow-up return path (43) and the vicinity of the lower end of the hot water storage tank (35);
A boiling pump (34) capable of adjusting a flow rate of water flowing through the boiling circuit (30);
A follow-up flow rate adjustment mechanism (344a) provided in the middle of the follow-up circuit (40) and capable of adjusting the flow rate of the passing hot water;
A connecting pipe flow rate adjusting mechanism (344b) provided in the middle of the connecting pipe (39) and capable of adjusting the flow rate of the passing hot water;
When the reheating and boiling heating are performed simultaneously, the flow of the boiling pump (34) is such that the flow rate of the boiling circuit (30) is larger than the flow rate of the reheating circuit (40 ). A control unit (10) for controlling a flow rate, a flow rate in the additional flow rate adjustment mechanism (344a), and a flow rate in the connection pipe flow rate adjustment mechanism (344b) ;
Hot water storage type hot water supply device ( 300 ). A bath water temperature detector (61T) for detecting the temperature of the hot water in the bathtub (70);
A bathtub set temperature receiving unit (10T) for receiving a set temperature of the bathtub (70);
Further comprising
Wherein the control unit (10), when the detected temperature of the bath water temperature detector (61T) is less than a predetermined determination temperature value than the set temperature, starting the reheating heat,
The hot water storage type hot water supply apparatus (100 , 200, 300 ) according to any one of claims 1 to 3 . A bath path (61) extending from the bathtub (70) to the reheating heat exchanging section (5), and a bath return path extending from the reheating heat exchanging section (5) to the bathtub (70) ( 64, 56), and further provided with a bath circulation circuit (60) that circulates between the bathtub (70) and the reheating heat exchanger (5).
The hot water storage type hot water supply device (100 , 200 , 300 ) according to any one of claims 1 to 4 . The control unit (10) starts the boiling heating at the same time when a predetermined condition is satisfied in the situation where the reheating is performed.
The hot water storage type hot water supply device (100 , 200 , 300 ) according to any one of claims 1 to 5 . The controller (10) drives the boiling pump (34) to start the boiling heating as the additional circulation pump (44) is driven to start the additional heating.
The hot water storage type hot water supply device (100, 200) according to claim 1 or 2 . The control unit (10) performs follow-up control so that the adjustment flow rate of the recirculation circulation pump (44) is 90% or more of the adjustment flow rate of the boiling pump (34).
The hot water storage type hot water supply device (100, 200) according to any one of claims 1, 2, and 6 . In the middle of the connecting pipe (39), there is provided a check mechanism (237) that allows only the flow from the connecting portion between the connecting pipe (39) and the vicinity of the lower end of the hot water storage tank (35) toward the joining portion. Being
The hot water storage type hot water supply device (200) according to claim 1 or 2 . The cross-sectional area of the hot water storage tank (35) is 1300 cm ² or less,
The internal volume of the hot water storage tank (35) is not less than 100 liters and not more than 200 liters,
The hot water storage type hot water supply device (100, 200, 300) according to any one of claims 1 to 9 . The working refrigerant of the heat pump unit (1) is a carbon dioxide refrigerant.
The hot water storage type hot water supply device (100, 200, 300) according to any one of claims 1 to 10 .