JP2011141069A - Bath device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bath device enabling reheating operation for a short time even when the temperature of hot water within a hot water storage tank becomes low. <P>SOLUTION: When the temperature of hot water in the upper part within the hot water storage tank 2 is low during reheating operation, by operating a heat pump return three-way valve 50 and a heat pump going three-way valve 51, a high-temperature high-pressure natural refrigerant from a compressor 11 is supplied to a reheating heat exchanger 49 and hot water around a bath heat exchanger 21 within the hot water storage tank 2 is directly heated by the reheating heat exchanger 49, to enable the temperature of the hot water around the bath heat exchanger 21 within the hot water storage tank 2 to become high. Even when the temperature of the hot water around the bath heat exchanger 21 within the hot water storage tank 2 is lowered to make it impossible to heat bathtub water during the reheating operation, the reheating operation can be restarted for a short time. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a bath apparatus with a bath chase.

  Conventionally, in this type, hot water is boiled and stored in the midnight hours when the unit price of contracted power by time is low, and the stored hot water is used for hot water and baths. A hot water storage tank unit 102 having a hot water storage tank 101 and a heat pump unit 103 as a heating means for heating the hot water in the hot water storage tank 101 are provided, and the hot water in the bathtub 104 is heated in the upper part of the hot water storage tank 101. A bath heat exchanger 105 made of a stainless steel serpentine tube is disposed, and a bath circulation circuit 109 made up of a bath return pipe 108 having a bath return pipe 106 and a bath circulation pump 107 is provided in the bath heat exchanger 105. The hot water in the bathtub 104 is circulated so that the hot water in the bathtub 104 is heated by the high-temperature water in the hot water storage tank 101 to keep warm. One in which Reheating is performed.

  In the automatic bath operation to the bathtub 101, when the automatic bath switch 111 of the bath remote controller 110 is operated, the hot water filling valve 112 is opened and hot water mixed with the bath set temperature is filled in the bathtub 104 by the hot water supply mixing valve 113. Then, the bath flow counter 114 counts the full amount of the bathtub 104 and finishes the hot water filling, and the bath circulation pump 107 is driven to circulate the hot water bath water through the bath circulation circuit 109 to exchange the heat of the bath. The bath 105 is driven up to the set temperature by the vessel 105 and the bath automatic operation is terminated.

Further, in the reheating operation, when the reheating switch 115 of the bath remote controller 110 is pressed, the bath circulation pump 107 starts driving, and the bath water in the bathtub 104 is sent from the bath outlet pipe 106 to the bath heat exchanger 105, where In the hot water storage tank 101, the bath water is heated by heat exchange with the high temperature water in the upper part and returned to the bathtub 104 by the bath return pipe 108. When the bath return temperature sensor 116 detects the bath set temperature, the bath circulation pump 107 is stopped. The chasing ends.
(For example, see Patent Document 1)
JP 2009-97815 A

  By the way, with this conventional one, the temperature of the hot water around the bath heat exchanger in the hot water storage tank decreases during the reheating operation, and the bath water in the bath cannot be heated to the bath set temperature with the bath heat exchanger. Then, the low-temperature water in the lower part of the hot water storage tank is taken out from the heat pump outlet pipe 9, heated to a high temperature by the heat pump unit, returned to the upper part of the hot water tank from the heat pump return pipe, and the hot water around the bath heat exchanger in the hot water tank is hot. The water in the hot water storage tank was heated by the heat pump unit until it became water.

  However, it takes time for the hot water around the bath heat exchanger in the hot water storage tank to become hot water, and during that time, it is not possible to reheat, and it takes time to reheat the bathtub water to the bath set temperature. There was a problem that.

  In order to solve the above-mentioned problems by focusing attention on this point, the present invention is particularly configured as claimed in claim 1. A hot water storage tank unit having a hot water storage tank for storing hot water and a heat pump unit for heating the hot water in the hot water storage tank are provided. A hot water storage pipe is connected to the upper end of the hot water storage tank and a water supply pipe is connected to the lower end of the hot water storage tank, and a bath heat exchanger for heating hot water in the bathtub is provided at the upper part of the hot water storage tank. The bath heat exchanger is connected to a bath circulation circuit consisting of a bath return pipe and a bath return pipe equipped with a bath circulation pump. The bath heat exchanger is located at a position facing the bath heat exchanger in the upper part of the hot water storage tank. A heat exchanger for reheating is disposed, and the heat pump unit includes a compressor, a refrigerant-water heat exchanger, an expansion valve, and an evaporator to form a heat pump circuit, and from the compressor Was supplied to the heat exchanger for reheating the medium, the refrigerant passing through the heat exchanger for reheating and constitutes a reheating circuit back to the expansion valve.

  Further, in the bath apparatus according to claim 2, in particular, in the structure according to claim 1, a three-way heat return valve is provided between the compressor and the refrigerant-water heat exchanger, and the refrigerant-water heat exchanger and the expansion valve are provided. A three-way valve is connected to the heat pump to form a reheating circuit, and the temperature of the hot water around the bath heat exchanger in the hot water storage tank is changed during the reheating operation in which the bath water is heated by the reheating heat exchanger. When the pressure drops, the refrigerant from the compressor is supplied to the reheating heat exchanger via the heat-pump return three-way valve, and the refrigerant that has passed through the reheating heat exchanger is returned to the expansion valve via the heat-pump return three-way valve. The operation is to heat the hot water around the bath heat exchanger.

  Further, in the bath apparatus according to claim 3, in particular, in the structure according to claim 1, an expansion valve for the refrigerant-water heat exchanger is provided between the refrigerant-water heat exchanger and the evaporator, and a reheating heat exchanger is provided. Is connected between the compressor and the refrigerant-water heat exchanger, and a reheating circuit is provided by providing an expansion valve for reheating heat exchanger between the downstream side of reheating heat exchanger and the evaporator. When the temperature of the hot water around the bath heat exchanger in the hot water storage tank decreases during the reheating operation in which the bathtub water is heated by the reheating heat exchanger, the expansion valve for the refrigerant-water heat exchanger is closed. By opening the expansion valve for the reheating heat exchanger, the refrigerant from the compressor is supplied to the reheating heat exchanger, and the refrigerant that has passed through the reheating heat exchanger is returned to the expansion valve for the reheating heat exchanger. The operation is to heat the hot water around the bath heat exchanger.

  According to claim 1 of the present invention, a reheating heat exchanger is disposed at a position facing the bath heat exchanger in the upper part of the hot water storage tank, and the heat pump unit includes a compressor, a refrigerant-water heat exchanger. The expansion valve and the evaporator constitute a heat pump circuit, and the refrigerant from the compressor is supplied to the reheating heat exchanger, and the refrigerant that has passed through the reheating heat exchanger is returned to the expansion valve. Since the fired circuit is configured, the hot water around the bath heat exchanger in the hot water tank is directly heated by the reheating heat exchanger, so that the hot water around the bath heat exchanger in the hot water tank can be quickly heated to a high temperature. Even if the temperature of the hot water around the bath heat exchanger in the hot water storage tank drops during the reheating operation and the bath water cannot be heated, the reheating operation can be resumed in a short time.

  Moreover, according to the bath apparatus of the second aspect of the present invention, the heat pump return three-way valve is provided between the compressor and the refrigerant-water heat exchanger, and between the refrigerant-water heat exchanger and the expansion valve. When the temperature of the hot water around the bath heat exchanger in the hot water storage tank drops during the reheating operation in which the heat pump is provided with a three-way valve to configure the reheating circuit and the bath water is heated by the reheating heat exchanger The refrigerant from the compressor is supplied to the reheating heat exchanger via the heat-pump return three-way valve, and the refrigerant that has passed through the reheating heat exchanger is returned to the expansion valve via the heat-pump return three-way valve. Since the hot water around the water heater is heated, the hot water in the hot water tank is heated and the hot water around the bath heat exchanger in the hot water tank is controlled by controlling the three-way valve returning to the heat pump Direct heating with a heat exchanger The operation and that is what can be done one or both simultaneously.

  According to the bath apparatus of the third aspect of the present invention, the expansion valve for the refrigerant-water heat exchanger is provided between the refrigerant-water heat exchanger and the evaporator, and the upstream side of the reheating heat exchanger. Is connected between the compressor and the refrigerant-water heat exchanger, and a reheating circuit is constructed by providing an expansion valve for reheating heat exchanger between the downstream side of the reheating heat exchanger and the evaporator, When the temperature of the hot water around the bath heat exchanger in the hot water storage tank decreases during the reheating operation in which the bath water is heated by the reheating heat exchanger, the expansion valve for the refrigerant-water heat exchanger is closed for reheating. By opening the expansion valve for the heat exchanger, the refrigerant from the compressor is supplied to the reheating heat exchanger, and the refrigerant that has passed through the reheating heat exchanger is returned to the expansion valve for the reheating heat exchanger to bath heat. Since the operation of heating the hot water around the exchanger is performed, the expansion valve for the refrigerant-water heat exchanger By controlling the expansion valve for the heat exchanger for hot water, the operation for boiling the hot water in the hot water storage tank and the operation for directly heating the hot water around the bath heat exchanger in the hot water tank with the heat exchanger for reheating are performed. , One or both at the same time.

The schematic block diagram of the bath apparatus which attached | subjected this Example of this invention. The schematic block diagram of the bath apparatus which attached the other Example. The schematic block diagram of the conventional bath apparatus.

Next, an embodiment of the present invention will be described with reference to the drawings.
This bath apparatus heats and stores hot water in the midnight hours when the unit price of contracted power by time is low, and uses the stored hot water for hot water or bath. 1 is a hot water storage tank 2 for storing hot water. 3 is a heat pump unit as a heating means for heating the hot water in the hot water storage tank, 4 is a hot water tap provided in a kitchen or a washroom, and 5 is a bathroom installation for remotely operating this bath device. A bath remote control, 6 is a bathtub.

  The hot water storage tank 2 of the hot water storage tank unit 1 has a hot water discharge pipe 7 connected to the upper end, a water supply pipe 8 connected to the lower end, a heat pump forward pipe 9 constituting a heat pump circulation circuit in the lower part, and a heat pump circulation circuit in the upper part. To the heat pump return pipe 10, the hot water in the hot water storage tank 2 taken out from the heat pump forward pipe 9 is boiled by the heat pump unit 3, returned to the hot water storage tank 2 from the heat pump return pipe 10, and stored in the hot water supply pipe 8. The hot water in the hot water storage tank 2 is pushed up by the water supply from the hot water, and the hot water in the upper part of the hot water storage tank 2 is pushed out from the hot water discharge pipe 7 to be hot water supplied.

  The heat pump unit 3 includes a compressor 11, a refrigerant-water heat exchanger 12 as a condenser, an electronic expansion valve 13, a forced air-cooled evaporator 14, and hot water in the hot water storage tank 2. A heat pump circulation pump 16 that circulates to the refrigerant-water heat exchanger 12 through the heat pump forward pipe 9 and the heat pump return pipe 10 and a heat pump control unit 17 that controls driving thereof are provided in the heat pump circuit 15. Is one in which carbon dioxide is used as a refrigerant to constitute a supercritical heat pump cycle. Since carbon dioxide is used as the refrigerant, low-temperature water can be boiled to a high temperature of about 90 ° C. without an electric heater.

  Here, the refrigerant-water heat exchanger 12 employs a counter flow system in which the refrigerant and hot water in the hot water storage tank 2 that is heated water are opposed to each other. In the supercritical heat pump cycle, the refrigerant is exchanged during heat exchange. Since it is condensed in the supercritical state, the heated water can be efficiently heated to a high temperature so that the temperature difference between the refrigerant-water heat exchanger 12 inlet temperature and the refrigerant outlet temperature is constant. Further, by controlling the electronic expansion valve 13 or the compressor 11, the water to be heated can be heated in a state where the COP (energy consumption efficiency) is very good.

  Reference numeral 18 denotes an outside air temperature detection sensor mounted at a position in contact with the outside air in the heat pump unit 3, which detects when the outside air temperature reaches the freezing prevention temperature, and drives the heat pump circulation pump 16 from the heat pump control unit 17. The flow path switching valve 19 in the middle of the circulation circuit is switched to the bypass path 20 side that bypasses the hot water storage tank 2, and the water in the heat pump circulation circuit is circulated to prevent freezing. In this case, the heat pump circuit 15 is driven to prevent freezing.

  Reference numeral 21 denotes a bath heat exchanger made of a stainless steel tube for heating the hot water in the bathtub 6, which is arranged at the upper part in the hot water storage tank 2. The bath heat exchanger 21 includes a bath outlet pipe 22 and A bath circulation circuit 25 comprising a bath return pipe 24 equipped with a bath circulation pump 23 is connected so that hot water in the bathtub 6 can be circulated, and the hot water in the bathtub 6 is heated by the high-temperature water in the hot water storage tank 2 to keep the heat or Reaping is done.

  A bath return temperature sensor 26 detects the temperature of the bath water flowing into the bath heat exchanger 21 through the bath return pipe 24, and 27 flows out of the bath heat exchanger 21 to the bathtub 6 through the bath outlet pipe 22. A bath temperature sensor 28 for detecting the temperature of the flowing bath water, 28 is a flow rate adjusting valve which is provided in the bath return pipe 21 and adjusts the circulating flow rate of the reheated bath water flowing into the bath 6, and the outside air temperature detecting sensor. When the outside air temperature is low, the control unit 29 that inputs the detected value from 18 makes the flow rate control valve 28 fully open to increase the sensible temperature by increasing the circulating flow rate, and conversely when the outside air temperature is high. The flow rate adjusting valve 28 is throttled to automatically adjust the circulating flow rate so as to reduce the sensible temperature.

  A hot water supply mixing valve 30 is composed of an electric mixing valve that mixes hot water from the hot water discharge pipe 7 and low-temperature water from the water supply bypass pipe 31 branched from the water supply pipe 9, and hot water supply provided in the hot water supply pipe 32 downstream thereof. The mixing ratio is controlled so that the hot water temperature detected by the temperature sensor 33 becomes the hot water supply set temperature set by the user.

  Reference numeral 34 denotes a hot water filling pipe branched from the hot water supply pipe 32 and communicated with the bath return pipe 24. The hot water filling pipe 34 includes a hot water filling valve 35 for starting / stopping hot water filling to the bathtub 6, and a bathtub 6. A bath flow counter 36 that counts the amount of hot water filled in and a check valve 37 that prevents the bath water from flowing back to the hot water supply pipe 32 are provided, and the hot water in the hot water storage tank 2 is directly supplied to the bath 6. The hot water filling pipe 34 is also used when pouring hot water.

  A plurality of hot water storage temperature sensors 38 are arranged in the vertical direction of the hot water storage tank 2. In this embodiment, five hot water storage temperature sensors are arranged and are referred to as 38 a, 38 b, 38 c, 38 d, 38 e from the top. Is used to detect how much heat is left in the hot water storage tank 2 and to detect the temperature distribution in the vertical direction in the hot water storage tank 2.

  The bath remote controller 5 is provided with a hot water supply temperature setting switch 39 for setting the hot water supply set temperature and a bath temperature setting switch 40 for setting the bath set temperature, respectively. A bath automatic switch 41 for keeping warm for a predetermined time, a hot water hot water switch 42 for pouring hot water into the bathtub 6, a lukewarm switch 43, and a reheating switch 44 are provided.

  45 is an overpressure relief valve for releasing the overpressure of the hot water storage tank 2, 46 is a pressure reducing valve for reducing the pressure of the water supply, 47 is a hot water supply flow rate counter for counting the amount of hot water supplied, and 48 is a water supply temperature for detecting the temperature of the water supply. It is a sensor.

  49 is a reheating heat exchanger provided at a position facing the bath heat exchanger 21 in the hot water storage tank 2, and the upstream side of the reheating heat exchanger 49 is the compressor 11 and the refrigerant-water heat exchanger 12. Is connected to the heat-pump return three-way valve 50 provided between the heat exchanger 49 and the downstream side of the reheating heat exchanger 49 is a heat-pump three-way valve provided between the refrigerant-water heat exchanger 12 and the electronic expansion valve 13. The rebirth circuit 52 is connected to 51.

Next, the operation of this embodiment will be described.
First, when the hot water storage temperature sensor 38 detects that the necessary amount of heat does not remain in the hot water storage tank 2 in the midnight power time zone, the control unit 29 issues a boiling start command to the heat pump control unit 17. . Upon receiving the command, the heat pump control unit 17 starts driving the heat pump after starting the compressor 11, and cools the low temperature water of about 5 to 20 ° C. taken out from the heat pump forward pipe 9 connected to the lower part of the hot water storage tank 2 as a refrigerant. -Heated to a high temperature of about 70 to 90 ° C by the water heat exchanger 12, returned to the hot water storage tank 2 from the heat pump return pipe 10 connected to the upper part of the hot water storage tank 2, and sequentially stacked from the upper part of the hot water storage tank 2 Store hot water. When the hot water storage temperature sensor 38 detects that the necessary amount of heat has been stored, the control unit 29 issues a boiling stop command to the heat pump control unit 17, and the heat pump control unit 17 stops the compressor 11 and the heat pump circulation pump. No. 16 is also stopped and the boiling operation is finished.

  Next, the hot water supply operation will be described. When the hot water tap 4 is opened, the water supplied from the water supply pipe 8 flows into the hot water storage tank 2. The hot water stored in the hot water storage tank 2 flows into the hot water supply mixing valve 30 through the hot water discharge pipe 7 and is mixed with the low temperature water from the hot water supply bypass pipe 31, and the mixing ratio of the hot water supply mixing valve 30 is adjusted by the control unit 29. Then, hot water having a hot water supply set temperature is supplied from the hot water tap 4. Then, the hot water supply is completed by closing the hot water tap 4.

  Next, automatic bath operation to the bathtub 6 will be described. When the automatic bath switch 41 of the bath remote controller 5 is operated, the hot water filling valve 35 is opened, and hot water mixed with the bath set temperature by the hot water supply mixing valve 30 is supplied to the bathtub 6. The hot water is filled and the bath flow counter 36 counts the full amount of the bathtub 6 so that the hot water filling is finished and the bath circulation pump 23 is driven to circulate the hot water filled bath water through the bath circulation circuit 25. The bath heat exchanger 21 is used to catch up to the set temperature and the bath automatic operation is terminated.

  Next, the reheating operation will be described. When the reheating switch 44 of the bath remote controller 5 is pressed, the bath circulation pump 23 starts to drive, and the bath water in the bathtub 6 is sent from the bath outlet pipe 22 to the bath heat exchanger 21. Here, the bath water is heated by heat exchange with the hot water in the upper part of the hot water storage tank 2 and returned to the bathtub 6 by the bath return pipe 24.

  Here, when the outside air temperature detected by the outside air temperature detection sensor 18 is less than 18 ° C., the control unit 29 determines that the outside air temperature is low, and opens the flow rate adjustment valve 28 to increase the circulation flow rate. When the reheating operation is performed and the bath return temperature sensor 26 detects the bath set temperature, the bath circulation pump 23 is stopped and the reheating is completed.

  When the outside air temperature detected by the outside air temperature detection sensor 18 is 18 ° C. or higher, it is judged that the outside air temperature is high, and the recirculation operation is performed by reducing the circulation flow rate by reducing the flow rate control valve 28 and returning to the bath. When the temperature sensor 26 detects the bath set temperature, the bath circulation pump 23 is stopped and the reheating is finished.

  By varying the flow rate according to the outside air temperature in this way, when the outside air temperature is low, such as in winter, the flow rate regulating valve 28 is fully opened, and the sensible temperature is increased by increasing the circulation flow rate. Conversely, when the outside air temperature is high, such as in summer, the flow rate control valve 28 is throttled to reduce the circulating flow rate and lower the sensible temperature, thereby preventing the body from warming too much. It is what you are doing.

  By the way, during this chasing operation, the control unit 29 determines whether or not the temperature detected by the bath return temperature sensor 267 is lower than the bath set temperature, and when the temperature is lower than the bath set temperature, the detected value of the hot water storage temperature sensors 38a and 38b. When the hot water around the bath heat exchanger 21 in the hot water storage tank 2, that is, the hot water in the upper part of the hot water storage tank 2 is judged as being hot, as a result, the hot water in the upper part of the hot water storage tank 2 is not hot. After driving the heat-pump return three-way valve 50 and the heat-pump forward three-way valve 51 via the heat-pone control unit 17, the high-temperature and high-pressure natural refrigerant from the compressor 11 can be supplied to the reheating heat exchanger 49. Then, the compressor 11 is started, and the high-temperature and high-pressure natural refrigerant pressurized to the supercritical pressure is supplied to the reheating heat exchanger 49 through the heat pump return three-way valve 50.

  Thereby, the hot water around the bath heat exchanger 21 in the hot water storage tank 2 is heated, and the refrigerant exchanging heat in the reheating heat exchanger 49 is between the refrigerant-water heat exchanger 12 and the electronic expansion valve 13. When the controller 29 determines that the hot water in the upper part of the hot water storage tank 2 has been heated to a high temperature based on the detection values of the hot water temperature sensors 38a and 38b, the controller 29 controls the heat pump controller 17 to Then, a supply stop command of the high-temperature and high-pressure natural refrigerant to the reheating heat exchanger 49 is issued, and the heat pump control unit 17 temporarily stops the compressor 11 and drives the heat pump return three-way valve 50 and the heat pump forward three-way valve 51. Thus, the high-temperature and high-pressure natural refrigerant can be supplied to the refrigerant-water heat exchanger 12, and the heating operation of the hot water around the bath heat exchanger 21 in the hot water storage tank 2 is completed.

  The hot water around the bath heat exchanger 22 in the hot water storage tank 2 becomes hot due to the heating operation of the hot water around the bath heat exchanger 22 in the hot water storage tank 2, and the bath water is exchanged with the hot water. When the bath return temperature sensor 27 is heated and detects the bath set temperature, the bath circulation pump 24 is stopped and the reheating is finished.

  In this way, the hot water around the bath heat exchanger 21 in the hot water storage tank 2 is directly heated by the reheating heat exchanger 49, so that the hot water around the bath heat exchanger 21 in the hot water storage tank 2 is heated to a high temperature in a short time. Even if the temperature of the hot water around the bath heat exchanger 21 in the hot water storage tank 2 is lowered during the reheating operation and the bath water cannot be heated, the reheating operation can be resumed in a short time. It is.

  In addition, if the temperature of the hot water around the bath heat exchanger 21 in the hot water storage tank 2 becomes a predetermined temperature or less during the reheating operation, the reheating heat exchanger 49 can be used to heat the reheating operation. In addition, the temperature of the hot water around the bath heat exchanger 21 in the hot water storage tank 2 can be prevented from being lowered and the bath water cannot be heated, and the reheating operation can always be performed in the shortest time.

  Further, if the heat-pump return three-way valve 50 and the heat-pump forward three-way valve 51 are driven so that high-temperature and high-pressure natural refrigerant can be supplied to both the refrigerant-water heat exchanger 12 and the reheating heat exchanger 49, While boiling all the hot water in the tank 2, the hot water around the bath heat exchanger 21 in the hot water storage tank 2 is heated so that the reheating operation can be performed simultaneously.

  In the present embodiment, the upstream side of the reheating heat exchanger 49 is connected to a heatpone return three-way valve 50 provided between the compressor 11 and the refrigerant-water heat exchanger 12, and reheating heat exchange is performed. The downstream side of the vessel 49 is connected to a heat pump forward three-way valve 51 provided between the refrigerant-water heat exchanger 12 and the electronic expansion valve 13, but is not limited to this, as shown in FIG. The upstream side of the exchanger 49 is connected between the compressor 11 and the refrigerant-water heat exchanger 12, and the refrigerant-water heat exchanger expansion valve 53 is provided between the refrigerant-water heat exchanger 12 and the evaporator 14. At the same time, a reheating heat exchanger expansion valve 54 is provided between the downstream side of the reheating heat exchanger 49 and the evaporator 14 to form a reheating circuit 52, and the refrigerating-water heat exchanger 12 and reheating heat are formed. The supply of the high-temperature and high-pressure natural refrigerant to the exchanger 49 is performed with the refrigerant-water heat exchanger expansion valve 53 and In which it may be performed by controlling the have fired heat exchanger expansion valve 54.

  As described above, in the present invention, when all the hot water in the hot water storage tank 2 is boiled up, heat is exchanged by the refrigerant-water heat exchanger 12 to heat the hot water in the hot water storage tank 2, thereby The electronic expansion valve 13 or the compressor 11 is controlled so that the temperature difference between the inlet temperature of the water heat exchanger 12 and the outlet temperature of the refrigerant is constant, and the water to be heated is in a very good COP (energy consumption efficiency) state. The hot water in the hot water storage tank 2 can be completely boiled by heating the hot water, and the temperature of the hot water around the bath heat exchanger 21 in the hot water storage tank 2 is lowered during the reheating operation. When it becomes impossible to heat up to the temperature, the hot water around the bath heat exchanger 21 in the hot water tank 2 is directly heated by supplying high-temperature and high-pressure refrigerant to the heating heat exchanger 49 in the hot water tank 2. Bath heat exchange in 2 The hot water around the bath 21 can be heated to a high temperature in a short time, and even if the temperature of the hot water around the bath heat exchanger 21 in the hot water storage tank 2 decreases during the chasing operation, the bath water cannot be heated. It is possible to resume driving after time.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit 2 Hot water storage tank 3 Heat pump unit 6 Bathtub 7 Hot water outlet pipe 8 Water supply pipe 11 Compressor 12 Refrigerant-water heat exchanger 13 Expansion valve 14 Evaporator 21 Bath heat exchanger 22 Bath outlet pipe 23 Bath circulation pump 24 Bath return Tube 25 Bath circulation circuit 49 Reheating heat exchanger 52 Reheating circuit

Claims (3)

  A hot water storage tank unit having a hot water storage tank for storing hot water and a heat pump unit for heating the hot water in the hot water storage tank are provided, and a hot water discharge pipe is connected to the upper end of the hot water storage tank and a water supply pipe is connected to the lower end. A bath heat exchanger for heating the hot water in the bathtub is provided in the upper part of the hot water storage tank, and the bath heat exchanger includes a bath return pipe having a bath return pipe and a bath circulation pump. In the bath apparatus connected to the hot water storage tank, a reheating heat exchanger is disposed at a position facing the bath heat exchanger in the upper part of the hot water storage tank. The heat pump unit includes a compressor, a refrigerant-water heat exchanger. And the expansion valve and the evaporator constitute a heat pump circuit, supply refrigerant from the compressor to the reheating heat exchanger, and expand the refrigerant that has passed through the reheating heat exchanger. Bath and wherein the configuring the reheating circuit return.   A heat pump return three-way valve is provided between the compressor and the refrigerant-water heat exchanger, and a heat pump forward three-way valve is provided between the refrigerant-water heat exchanger and the expansion valve to constitute a reheating circuit, When the temperature of the hot water around the bath heat exchanger in the hot water storage tank decreases during the reheating operation in which water is heated by the reheating heat exchanger, the refrigerant from the compressor is reheated through the heat pump return three-way valve. The refrigerant is supplied to the heat exchanger for heating, and the refrigerant that has passed through the reheating heat exchanger is returned to the expansion valve through the three-way valve in the heat pump to heat the hot water around the bath heat exchanger. The bath apparatus according to claim 1.   An expansion valve for the refrigerant-water heat exchanger is provided between the refrigerant-water heat exchanger and the evaporator, and the upstream side of the reheating heat exchanger is connected between the compressor and the refrigerant-water heat exchanger. During the reheating operation in which a reheating circuit is constructed by providing an expansion valve for reheating heat exchanger between the downstream side of the reheating heat exchanger and the evaporator, and the bath water is heated by the reheating heat exchanger. When the temperature of the hot water around the bath heat exchanger in the hot water storage tank drops, the refrigerant-water heat exchanger expansion valve is closed and the reheating heat exchanger expansion valve is opened to remove the refrigerant from the compressor. It is supplied to the reheating heat exchanger, and the refrigerant that has passed through the reheating heat exchanger is returned to the expansion valve for the reheating heat exchanger to heat the hot water around the bath heat exchanger. The bath apparatus according to claim 1.

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