JP6247947B2 - Heat supply equipment - Google Patents

Description

  The technology disclosed herein relates to a heat supply device such as a hot water supply device, a bath device, and a heating device, and more particularly, to a heat supply device that can recover heat from bath water in a bathtub.

  Patent Document 1 describes a heat supply device. This device is provided on a tank for storing a heat medium, a heat source for heating the heat medium in the tank, a heat storage circulation path for circulating the heat medium between the tank and the heat source, and a heat storage circulation path. A bath water heat exchanger for exchanging heat between the heat medium in the tank and the bath water in the bath, and a bath water circulation path for circulating the bath water between the bath water heat exchanger and the bath Prepare. According to such a configuration, heat can be recovered from the bath water (so-called remaining hot water) remaining in the bathtub and stored in the tank.

JP 10-318604 A

  In the above-described conventional apparatus, the bath water heat exchanger is located upstream of the heat source in the heat storage circulation path. With such a configuration, the bath water heat exchanger is always supplied with a low-temperature heat medium sent from the lower part of the tank before heating by the heat source. Therefore, in the bath water heat exchanger, heat can be recovered from the bath water in the bathtub, but heat cannot be supplied to the bath water in the bathtub (so-called boiling or reheating of the bath). In order to supply heat to the bath water in the bathtub, another heat exchanger and a heat source are further required.

  In view of the above circumstances, the present specification provides a heat supply device capable of recovering heat and supplying heat to bath water using a common heat exchanger.

  In the technology disclosed in this specification, a bath water heat exchanger for exchanging heat between the heat medium in the tank and the bath water in the bathtub is disposed downstream of the heat source in the heat storage circulation path. According to such a configuration, when the heat source is stopped, heat can be recovered from the bath water in the bathtub by sending a low-temperature heat medium to the bath water heat exchanger. On the other hand, when the heat source is in operation, a high-temperature heat medium is sent to the bath water heat exchanger, so that heat can be supplied to the bath water in the bathtub.

  According to one aspect of the present technology, a heat supply device is disclosed. The heat supply device includes a tank for storing a heat medium, a heat source for heating the heat medium in the tank, a heat storage circulation path for circulating the heat medium between the tank and the heat source, and a heat storage circulation path that is more than the heat source. Located downstream, the bath water heat exchanger for heat exchange between the heat medium in the tank and the bath water in the bathtub, and the bath water circulates between the bath water heat exchanger and the bathtub And a control device capable of selectively executing a heat recovery operation for recovering the bath water heat and a heat supply operation for supplying heat to the bath water. In the heat recovery operation, the circulation of the heat medium by the heat storage circulation path and the circulation of the bath water by the bath water circulation path are performed while the heat source is stopped. In the heat supply operation, the heat medium is circulated by the heat storage circulation path and the bath water is circulated by the bath water circulation path during the operation of the heat source.

  According to the heat supply device described above, both the heat recovery operation and the heat supply operation for the bath water can be executed as necessary. Note that the control device may selectively execute the heat recovery operation or the heat supply operation according to the operation state of the heat source, or operate and stop the heat source as necessary for the heat recovery operation or the heat supply operation. May be controlled.

The figure which shows the structure of the hot water supply apparatus of an Example. The flowchart which shows the process which concerns on the heat recovery driving | running which a control apparatus performs. The flowchart which shows the process which concerns on the heat supply driving | running which a control apparatus performs.

  In an embodiment of the present technology, the control device starts the heat recovery operation based on an instruction from the user or when a predetermined condition is satisfied (for example, when a predetermined time is reached), for example. can do. However, when the temperature of the heat medium in the tank exceeds a predetermined temperature at the time when the heat recovery operation should start, the control device preferably suspends or cancels the execution of the heat recovery operation. According to such a configuration, the temperature of the heat medium in the tank is relatively high (for example, a temperature that reliably exceeds the temperature of the bath water), and it is difficult to recover the heat from the bath water. Sometimes, unnecessary heat recovery operations can be avoided.

  In addition to or instead of the above, when the heat source is in operation at the time when the heat recovery operation should be started, the control device preferably suspends or cancels the execution of the heat recovery operation. According to such a configuration, when the heat source is in operation and heat recovery from the bath water is difficult, it is possible to avoid unnecessary heat recovery operation.

  In addition to the above, the control device preferably suspends the execution of the heat recovery operation when the execution of the heat recovery operation is suspended for a predetermined time from the time point at which the heat recovery operation should be started. According to such a configuration, it is possible to avoid performing unnecessary heat recovery operation in a situation where the temperature of the bath water is greatly reduced by heat radiation while the execution of heat recovery operation is suspended. it can.

  In one embodiment of the present technology, the control device preferably ends the heat recovery operation based on a temperature difference between the heat medium flowing into the bath water heat exchanger and the bath water during the execution of the heat recovery operation. . In this case, for example, when the temperature difference becomes less than a predetermined temperature difference, the control device may end the heat recovery operation, assuming that heat recovery is difficult or not effective.

  In one embodiment of the present technology, the heat source is preferably a heat pump or a generator (including a hydrogen battery). However, the heat source may be a combustor such as a boiler or a burner. The configuration of the heat source is not particularly limited.

  In one embodiment of the present technology, the heat supply device may be a hot water supply device or a heating device. For example, if the heating medium stored in the tank is water, it is possible to embody a hot water supply device that heats the water and supplies it to a hot water supply location. Alternatively, if the heat medium stored in the tank is an antifreeze liquid (or other heat medium), a heating device that heats the antifreeze liquid and supplies it to the heating terminal can be realized.

  A hot water supply apparatus 10 according to an embodiment will be described with reference to the drawings. The hot water supply device 10 is a type of heat supply device, and is a device that supplies hot water to hot water supply locations such as a bathtub 4 and a currant (not shown) by heating clean water. As will be described in detail later, the hot water supply apparatus 10 of this embodiment supplies heat to the heat recovery operation for recovering heat from the bath water (remaining hot water) in the bathtub 4 and the bath water in the bathtub 4 in addition to the hot water supply operation. Heat supply operation (so-called bath boiling and reheating) can be performed. As shown in FIG. 1, the hot water supply device 10 mainly includes a tank 20, a heat pump 30, a heat storage circulation path 40, a bath water heat exchanger 50, a bath water circulation path 60, a combustion unit 80, and a control device. 90 and a remote control 92.

  The tank 20 is a sealed container for storing hot water, and has a substantially cylindrical appearance. The tank 20 is connected to a hot water supply path 24 for discharging hot water in the tank 20 (hereinafter also referred to as tank hot water) and a water supply path 26 for supplying clean water to the tank 20. The hot water supply path 24 is connected to the upper part (specifically, the upper surface) of the tank 20, and the water supply path 26 is connected to the lower part (specifically, the bottom surface) of the tank 20. The tank 20 is provided with a plurality of tank temperature sensors 22 along the vertical direction. The plurality of tank temperature sensors 22 measure the temperature of the tank hot water at each position. Each tank temperature sensor 22 is electrically connected to the control device 90, and their output signals are input to the control device 90. The control device 90 can grasp the amount of heat stored in the tank 20 based on the output signal of each tank temperature sensor 22. For example, a thermistor can be employed as the tank temperature sensor 22 (the same applies to various temperature sensors described later).

  The heat pump 30 is an example of a heat source for heating the hot water in the tank 20, and heats the tank hot water by collecting heat from the atmosphere. The internal structure of the heat pump 30 is not particularly limited and is the same as a publicly known one, and the description thereof is omitted here. The heat pump 30 is connected to the tank 20 via the heat storage circulation path 40.

  The heat storage circulation path 40 is a pipe that circulates hot water in the tank 20 between the heat pump 30 and the tank 20. A heat storage circulation pump 32 is provided in the heat storage circulation path 40. When the heat storage circulation pump 32 is operated, low temperature hot water (or water) is sent from the lower part of the tank 20 to the heat pump 30 through the heat storage circulation path 40. Then, the hot water heated by the heat pump 30 is returned to the upper part of the tank 20. That is, the heat storage circulation path 40 can be divided into an upstream section 40 a from the tank 20 to the heat pump 30 and a downstream section 40 b from the heat pump 30 to the tank 20. The heat pump 30 and the heat storage circulation pump 32 are electrically connected to the control device 90, and their operations are controlled by the control device 90. Basically, the control device 90 controls the heat pump 30 and the heat storage circulation pump 32 based on the amount of heat stored in the tank 20, that is, based on temperatures detected by the plurality of tank temperature sensors 22.

  The bath water heat exchanger 50 is a heat exchanger for exchanging heat between hot water in the tank 20 (specifically, tank hot water flowing through the heat storage circulation path 40) and bath water in the bathtub 4. The bath water heat exchanger 50 is provided in the heat storage circulation path 40, and is particularly provided in a section 40 b downstream from the heat pump 30. The specific configuration of the bath water heat exchanger 50 is not particularly limited. The bath water heat exchanger 50 is connected to the bathtub 4 via the bath water circulation path 60. The bath water heat exchanger 50 is a conduit that circulates the bath water in the bathtub 4 between the bathtub 4 and the bath water heat exchanger 50. The bath water circulation path 60 is provided with a bath water circulation pump 66 and a water flow sensor 68. When the bath water circulation pump 66 is operated, the bath water in the bathtub 4 is sent to the bath water heat exchanger 50 through the bath water circulation path 60. Then, the bath water that has passed through the bath water circulation path 60 is returned to the bathtub 4 via the combustion unit 80. At this time, the flow of the bath water in the bath water circulation path 60 is detected by the water flow sensor 68. The bath water circulation pump 66 and the water flow sensor 68 are electrically connected to the control device 90, the operation of the bath water circulation pump 66 is controlled by the control device 90, and the output signal of the water flow sensor 68 is input to the control device 90. .

  A bypass path 70 is provided in the bath water circulation path 60. The bypass path 70 is provided in parallel with the bath water heat exchanger 50 and can send the bath water from the bathtub 4 to the combustion unit 80 without going through the bath water heat exchanger 50. A bypass valve 72 is provided in the bypass path 70. The bypass valve 72 is, for example, an electromagnetic valve, and can selectively open and close the bypass path 70. The bypass valve 72 is electrically connected to the control device 90, and its operation is controlled by the control device 90. In the heat recovery operation and heat supply operation described later, the bypass path 70 is closed by the bypass valve 72.

  The combustion unit 80 is a second heat source of the hot water supply device 10 and is provided on the bath water circulation path 60. The combustion unit 80 is located downstream of the bath water heat exchanger 50 in the bath water circulation path 60. The combustion unit 80 burns fuel gas (for example, city gas or propane gas) to heat the bath water flowing through the bath water circulation path 60. Although the combustion unit 80 is an example, it has the burner 82, the sensible heat exchanger 84, and the latent heat exchanger 86. FIG. The specific configuration of the combustion unit 80 is not particularly limited. The combustion unit 80 is not limited to fuel gas, and may burn liquid fuel or solid fuel.

  The hot water supply apparatus 10 has various sensors. For example, an HP outlet temperature sensor 42 is provided in the heat storage circulation path 40. The HP outlet temperature sensor 42 is provided in a section between the heat pump 30 and the bath water heat exchanger 50 and measures the temperature of the tank hot water heated by the heat pump 30 and flowing into the bath water heat exchanger 50. The HP outlet temperature sensor 42 is electrically connected to the control device 90, and its output signal is input to the control device 90.

  On the other hand, the bath water circulation path 60 is provided with a first bath water temperature sensor 62, a second bath water temperature sensor 64, a third bath water temperature sensor 88, and a water flow sensor 68. The first bath water temperature sensor 62 is located upstream of the bath water heat exchanger 50 and measures the temperature of the bath water flowing into the bath water heat exchanger 50. The second bath water temperature sensor 64 is located on the downstream side of the bath water heat exchanger 50 and measures the temperature of the bath water flowing out of the bath water heat exchanger 50. The second bath water temperature sensor 64 is located on the downstream side of the bath water heat exchanger 50 and measures the temperature of the bath water flowing out of the bath water heat exchanger 50. The third bath water temperature sensor 88 is located on the downstream side of the combustion unit 80 and measures the temperature of the bath water flowing out from the combustion unit 80 and returned to the bathtub 4. The water flow sensor 68 detects the flow of bath water in the bath water circulation path 60. Each of these sensors is electrically connected to the control device 90, and an output signal thereof is input to the control device 90.

  The remote controller 92 is a user interface in the hot water supply apparatus 10. The remote controller 92 can receive various instructions from the user and display various information to the user. The configuration of the remote control 92 is not particularly limited, and at least a part thereof may be configured using a wireless information terminal such as a smartphone or a tablet.

  With the above configuration, the hot water supply device 10 heats the hot water in the tank 20 in advance by the heat pump 30 as a basic function, and supplies the hot water in the tank 20 to the hot water supply location as necessary. In addition, although description is abbreviate | omitted in this specification, the hot water discharged from the tank 20 may be heated secondary by the combustion unit 80 or another heat source. Furthermore, as described above, the hot water supply apparatus 10 can selectively execute a heat recovery operation and a heat supply operation (so-called bath boiling or reheating) for the bath water in the bathtub 4. Hereinafter, the heat recovery operation and the heat supply operation will be described in detail with reference to FIGS.

  First, the flow of the heat recovery operation will be described with reference to FIG. The user can operate the remote controller 92 to give a heat recovery operation instruction to the hot water supply apparatus 10. When control device 90 receives an instruction for heat recovery operation (YES in S10), control device 90 proceeds with the processing shown in FIG. Note that the heat recovery operation is not limited to an instruction from the user, and processing related to the heat recovery operation may be started when a predetermined condition is satisfied (for example, when a specific time is reached). In this case, the condition may be adjusted according to the lifestyle of the user by a learning function that learns the daily driving mode of the hot water supply device 10.

  As shown in FIG. 2, the controller 90 confirms whether or not the heat pump 30 is stopped prior to the execution of the heat recovery operation (S12). Further, the control device 90 determines whether or not the temperature of the hot water in the tank 20 is less than 40 degrees Celsius (S14). And when these conditions are satisfied (it is YES at S12 and S14), it progresses to the process which performs subsequent heat recovery driving | operation. Although it is an example, it is preferable that the control apparatus 10 employ | adopts the detection temperature of the tank temperature sensor 22 located in the lowest place as the temperature of the hot water in the tank 20. FIG. Alternatively, the control device 10 may temporarily operate the heat storage circulation pump 32 and employ the temperature of the HP outlet temperature sensor 42. The above-mentioned value of “40 degrees Celsius” is an example of a predetermined temperature, and is a temperature (for example, 10 degrees Celsius) lower than a target hot water storage temperature (for example, 45 degrees Celsius) of the tank 20 (for example, 10 degrees Celsius). 35 degrees Celsius) may be set as a predetermined temperature, or an arbitrary value of 40 degrees Celsius or less may be adopted.

  When the above conditions are not satisfied (NO in S12 or S14), it can be said that it is difficult to execute an effective heat recovery operation. For example, when the heat pump 30 is in operation, the bath water may be heated by the hot water heated by the heat pump 30. In addition, when the hot water in the tank 20 is hot, the bath water may be heated by the tank hot water sent from the tank 20. Therefore, when the above-described conditions are not satisfied (NO in S12 or S14), the control device 90 suspends execution of the heat recovery operation until those conditions are satisfied. However, when the execution of the heat recovery operation is suspended for 8 hours from the time when the heat recovery operation should be started (YES at S10), the execution of the heat recovery operation is stopped. At that time, the bath water in the bathtub 4 is already cooled by heat radiation, and sufficient heat recovery cannot be expected. Note that the above-described value of “8 hours” is an example of a predetermined time, and other values can be appropriately adopted in consideration of, for example, the size of the bathtub 4 and heat insulation.

  When the conditions for the heat recovery operation are satisfied (YES in S12 and S14), the control device 90 starts the operation of the bath water circulation pump 66 (S18). At this time, if the water flow sensor 68 does not detect the flow of bath water (NO in S20), it is determined that there is no bath water in the bathtub 4, the bath circulation pump 66 is stopped (S28), and the heat recovery operation is stopped. To do. The presence / absence of bath water in the bathtub 4 is not limited to the water flow sensor 68 but may be detected by a water level sensor (not shown) or other means.

  On the other hand, if the water flow sensor 68 detects the flow of bath water (YES in S20), the control device 90 starts the operation of the heat storage circulation pump 32 (S22). Thus, hot water circulation in the heat storage circulation path 40 and bath water circulation in the bath water circulation path 60 are performed while the heat pump 30 is stopped. In this state, the hot water from the tank 20 and the hot bath water from the bathtub 4 respectively flow into the bath water heat exchanger 50, and the former is heated by the latter. As a result, the heat of the bath water in the bathtub 4 is recovered by the tank hot water and accumulated in the tank 20.

  As heat recovery from the bath water proceeds, the temperature of the bath water decreases, and the temperature difference between the bath water and the hot water from the tank 20 also decreases. When the temperature difference becomes small, effective heat recovery becomes difficult. Therefore, when the temperature difference between the temperature detected by the HP outlet temperature sensor 42 and the temperature detected by the first bath water temperature sensor 62 is less than 5 degrees Celsius (YES in S24), the control device 90 recovers heat. End driving. Specifically, the operation of the heat storage circulation pump 32 and the bath water circulation pump 66 is stopped (S26 and S28). Here, the above-described value of “5 degrees Celsius” is an example of a predetermined temperature difference, and other values can be appropriately adopted in consideration of, for example, the capacity of the bath water heat exchanger 50 and the like.

  Next, the flow of the heat supply operation (so-called boiling or reheating) will be described with reference to FIG. The user can operate the remote controller 92 to give a heat supply operation instruction to the hot water supply device 10 together with the bath set temperature that is the target temperature of the bath water. When control device 90 receives an instruction for heat supply operation (YES in S30), control device 90 proceeds with the process shown in FIG. In the hot water supply apparatus 10 according to the present embodiment, a second heat supply operation mainly using the combustion unit 80 can be executed instead of the heat supply operation described below. Since the second heat supply operation is a conventionally known method, the description thereof is omitted here.

  As shown in FIG. 3, the controller 90 confirms whether or not the heat pump 30 is in operation prior to the execution of the heat supply operation (S32). When the heat pump 30 is stopped, the control device 90 confirms whether or not the heat pump 30 can be operated (YES in S34), starts the operation of the heat storage circulation pump 32 (S36), and starts the operation of the heat pump 30. (S38). On the other hand, when the operation of the heat pump 30 is impossible (NO in S34), such as when the outside air temperature is extremely low, the heat supply operation is stopped. In this case, the control device 90 may execute a second heat supply operation using the combustion unit 80.

  Next, if the detected temperature of the HP outlet temperature sensor 42 exceeds the temperature obtained by adding 5 degrees Celsius to the bath set temperature (YES in S40), the control device 90 starts the operation of the bath water circulation pump 66 (S42). ). On the other hand, when the above condition (S40) is not satisfied, it is determined that the preheating of the heat pump 30 is insufficient and the bath water circulation pump 66 is not operated. Thereafter, when the above conditions are satisfied (YES in S40), the operation of the bath water circulation pump 66 is started. Here, the above-described value of “5 degrees Celsius” is an example, and can be changed as appropriate in consideration of, for example, the capacity of the bath water heat exchanger 50 (may be zero degrees).

  When the operation of the bath water circulation pump 66 is started, hot water circulation in the heat storage circulation path 40 and bath water circulation in the bath water circulation path 60 are performed while the heat pump 30 is in operation. Low temperature bath water from the bathtub 4 and high temperature tank hot water heated by the heat pump 30 respectively flow into the bath water heat exchanger 50, and the former is heated by the latter. As a result, the bath water in the bathtub 4 is heated by receiving heat supplied from the heat pump 30. When the bath water temperature exceeds the bath set temperature by the user (S46), the control device 90 stops the bath water circulation pump 66 (S48), and ends the heat supply operation. Here, the control device 90 can employ the temperature detected by the second bath water temperature sensor 64 or the third bath water temperature sensor 88 as the bath water temperature.

  On the other hand, when the water flow sensor 68 does not detect the flow of bath water after the start of operation of the bath water circulation pump 66 (S42) (NO in S44), the control device 90 determines that there is no bath water in the bathtub 4. Then, the bath water circulation pump 66 is immediately stopped (S48), and the heat supply operation is stopped.

  As described above, in the hot water supply apparatus 10 of the present embodiment, the bath water heat exchanger 50 for exchanging heat between the hot water in the tank 20 and the bath water in the bathtub 4 is provided as a heat pump in the heat storage circulation path 40. It is located downstream of 30. With such a configuration, while the heat pump 30 is stopped, heat is recovered from the bath water in the bathtub 4 by performing the circulation of the tank hot water by the heat storage circulation path 40 and the circulation of the bath water by the bath water circulation path 60. Heat recovery operation can be performed. Further, during the operation of the heat pump 30, a heat supply operation for supplying heat to the bath water in the bathtub 4 by performing circulation of the tank hot water by the heat storage circulation path 40 and circulation of the bath water by the bath water circulation path 60 is performed. It can be carried out. Since heat recovery and heat supply to the bath water are performed by the common bath water heat exchanger 50, the hot water supply apparatus 10 has a relatively simple configuration, particularly in terms of the number of heat exchangers and the piping structure. ing.

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

  For example, in this embodiment, the heat pump 30 may be changed to a generator (including a fuel cell) or other heat source. Moreover, the structure of the hot water supply apparatus 10 of a present Example is applicable also to the heating apparatus which stores the heat medium supplied to a heating terminal in the tank 20. FIG. Furthermore, the hot water supply apparatus 10 of the present embodiment does not necessarily require the combustion unit 80. Or the hot water supply apparatus 10 may have three or more heat sources. In the heat supply operation, the heat supply to the bath water by the heat pump 30 may be assisted using the combustion unit 80 or another heat source.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and achieving one of the objects itself has technical utility.

4: Bath 10: Hot water supply device 20: Tank 30: Heat pump 32: Heat storage circulation pump 40: Heat storage circulation path 42: HP outlet temperature sensor 50: Bath water heat exchanger 60: Bath water circulation path 62: First bath water temperature sensor 64 : Second bath water temperature sensor 66: bath water circulation pump 80: combustion unit 88: third bath water temperature sensor 90: control device 92: remote control

Claims (6)

A tank for storing the heat medium,
A heat source for heating the heating medium in the tank;
A heat storage circulation path for circulating the heat medium between the tank and the heat source;
A bath water heat exchanger for exchanging heat between the heat medium in the tank and the bath water in the bathtub, provided in a section downstream of the heat source of the heat storage circulation path;
A bath water circulation path for circulating bath water between the bath water heat exchanger and the bathtub;
A control device capable of selectively executing a heat recovery operation for recovering heat of the bath water and a heat supply operation for supplying heat to the bath water;
With
In the heat recovery operation, while the heat source is stopped, circulation of the heat medium by the heat storage circulation path and circulation of the bath water by the bath water circulation path are performed.
In the heat supply operation, during the operation of the heat source, circulation of the heat medium by the heat storage circulation path and circulation of the bath water by the bath water circulation path are performed .
Said controller, at the time to start the heat recovery operation, when the heat source is in operation, you hold or abort the execution of the heat recovery operation,
Heat supply device.   2. The control device according to claim 1, wherein when the temperature of the heat medium in the tank exceeds a predetermined temperature at a time point when the heat recovery operation is to be started, execution of the heat recovery operation is suspended or stopped. Heat supply device. The control device according to claim 1 or 2 , wherein when the heat recovery operation is suspended for a predetermined time from the time point at which the heat recovery operation is to be started, the control device stops the heat recovery operation. The heat supply device described. A tank for storing the heat medium,
A heat source for heating the heating medium in the tank;
A heat storage circulation path for circulating the heat medium between the tank and the heat source;
A bath water heat exchanger for exchanging heat between the heat medium in the tank and the bath water in the bathtub, provided in a section downstream of the heat source of the heat storage circulation path;
A bath water circulation path for circulating bath water between the bath water heat exchanger and the bathtub;
A control device capable of selectively executing a heat recovery operation for recovering heat of the bath water and a heat supply operation for supplying heat to the bath water;
With
In the heat recovery operation, while the heat source is stopped, circulation of the heat medium by the heat storage circulation path and circulation of the bath water by the bath water circulation path are performed.
In the heat supply operation, during the operation of the heat source, circulation of the heat medium by the heat storage circulation path and circulation of the bath water by the bath water circulation path are performed.
When the temperature of the heat medium in the tank exceeds a predetermined temperature at the time when the heat recovery operation should be started , the control device suspends or cancels the execution of the heat recovery operation and performs the heat recovery operation. When the execution of the heat recovery operation is suspended for a predetermined time from the start time, the execution of the heat recovery operation is stopped .
Heat supply device.   The control device ends the heat recovery operation based on a temperature difference between the heat medium flowing into the bath water heat exchanger and the bath water during execution of the heat recovery operation. The heat supply apparatus according to any one of 4.   The heat supply device according to any one of claims 1 to 5, wherein the heat source is a heat pump or a generator.

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