JPH0354272B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention cools the hot water in the bathtub using a heat pump system when the hot water in the bathtub is high temperature.
The present invention relates to a bath water temperature adjustment device that adjusts the temperature of water in a bathtub to an appropriate temperature. (Prior art) When hot water in a bathtub is cooled at a high temperature, conventionally,
It is cooled by water supply. However, when the water supply temperature is high, a large amount of water is supplied to cool the bathtub to an appropriate temperature, resulting in a so-called overflow, in which water overflows from the bathtub. Therefore, a technology has been developed that uses a heat pump system to cool the hot water in the bathtub instead of using water supply. This technology was developed in Japanese Patent Application Publication No. 60-
The one described in Publication No. 82755 is known. FIG. 5 is a configuration diagram showing the above-mentioned conventional example.
In this figure, 101 is a compressor, 102 is a bathtub heat exchanger, 103 is an outdoor heat exchanger, 105 is an auxiliary hot water storage tank housing the bathtub heat exchanger 102, 106 is a bathtub, 107 is a hot water temperature controller, and 108 is a hot water temperature controller. This is a water delivery pipe. P0 is a pump that circulates hot water in the bathtub 106 to the bathtub heat exchanger 102. X0
is a valve switching mechanism, Y0 is an expansion mechanism, and A0 is an outdoor unit. With these configurations, when heating or reheating the hot water in the bathtub 106, the refrigerant from the compressor 101 is transferred from the bathtub heat exchanger 102 to the expansion mechanism Y0.
The heat absorbed by the outdoor heat exchanger 103 is transferred to the bathtub heat exchanger 102 through the circulating flow.
heat is radiated to heat the hot water in the bathtub 106. Using this bathtub heat exchanger 102, the refrigerant from the compressor 101 is transferred to the outdoor heat exchanger 10 by switching the valve switching mechanism
3 to the bathtub heat exchanger 102 via the expansion mechanism Y0.
The circulating flow causes the heat absorbed by the bathtub heat exchanger 102 to be radiated by the outdoor heat exchanger 103, thereby cooling the hot water in the bathtub 106. (Problem to be Solved by the Invention) However, in the case of the conventional example having such a configuration, when cooling using a heat pump system, it takes longer to cool than when using water, and it is difficult to cool down after entering the bathroom. When the temperature was found to be high, the user had to wait naked for a relatively long time until the temperature reached the appropriate temperature. The present invention has been made in view of the above circumstances, and is designed to cool the hot water in the bathtub when it is hot.
The purpose is to avoid overflow associated with water supply and to be able to do it quickly and economically. (Means for Solving the Problems) In order to achieve the above object, the bath water temperature regulating device of the present invention includes: a bathtub heat exchanger 8; and heat release heat exchangers 22, 18, 26. The bathtub heat exchanger 8 acts as an evaporator between the heat release heat exchangers 22, 18, 26 and the bathtub heat exchanger 8, and the heat release heat exchanger 22, A compressor 23 that circulates and flows refrigerant so that 18 and 26 act as a condenser.
and a water supply valve 13 that opens and closes to supply water to the bathtub 3.
and a water temperature sensor 16 that detects the temperature of the water in the bathtub 3.
and a first hot water supply valve that opens the water supply valve 13 when the hot water temperature detected by the hot water temperature sensor 16 is higher than the set temperature, and closes the water supply valve 13 when the detected hot water temperature falls below the set temperature. If the detected hot water temperature has not decreased below the set temperature even after the opening time of the water supply valve 13 by the first hot water temperature adjustment means has elapsed, the water supply valve 13 is closed. operating the compressor 23, and
and a second hot water temperature adjusting means for stopping the compressor 23 when the detected hot water temperature becomes equal to or lower than the set temperature. (Function) According to this configuration, when the water temperature in the bathtub 3 is high, first, the water supply valve 1 is
3 is opened and the water is cooled using a pitcher, and if the temperature falls below the set temperature within the set time, the water supply valve 13 is closed to complete the cooling. If the water cannot be cooled down to the set temperature or lower even after the set time has elapsed, the second hot water temperature regulating means stops the water supply valve 13 and operates the compressor 23 until the detected hot water temperature falls below the set temperature. , the bathtub heat exchanger 8 acts as an evaporator,
The hot water in the bathtub 3 is cooled. (Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 is a system configuration diagram of a bath water temperature regulating device according to an embodiment of the present invention. In this figure, 1 is an outdoor unit as a heat source side unit, and 2 is an initial hot water supply unit that supplies water and hot water into the bathtub 3 at a predetermined ratio and pours a set amount of hot water at a set temperature into the bathtub 3. A heat pump type bathtub unit for maintaining the hot water in the bathtub 3 at a set temperature after the control is completed; 4 is a bathroom heating unit for heating the bathroom 5 and drying laundry; 6 is a bathroom heating unit for heating the bathroom 5, drying laundry, etc.;
Indoor units that perform indoor heating, cooling, and air conditioning;
7 is a hot water storage tank unit. The bathtub unit 2 includes a heat pump type bathtub heat exchanger 8, a circulation pump 10 that circulates hot water in the bathtub 3 to the bathtub heat exchanger 8 through a circulation pipe 9, and a hot water pipe 12 that supplies hot water via a hot water valve 11; a water supply pipe 14 that supplies city water via a water supply valve 13;
A mixing tank 15 is provided for mixing hot water and water from the hot water supply pipe 12 and the water supply pipe 14, respectively. Further, a hot water temperature sensor 16 is provided on the suction side of the circulation pipe 9 relative to the circulation pump 10.
The water level is set on the inner wall of the mixing tank 15 at a location corresponding to the level at which the upper part of the circulation pipe 9 communicates with the bathtub 3, and the water level is set at a level that allows the operation of the circulation pump 10.
An operation permissible water level sensor _L0 detects HO, and three levels of set water levels HH, HH,
Set water level sensors L ₁ , L ₂ , which detect HM, HL
L ₃ is attached. These water level sensors L ₀ ,
Each of L ₁ , L ₂ , and L ₃ is composed of a positive temperature coefficient thermistor. The hot water storage tank unit 7 includes a hot water storage tank 17.
, a heat exchanger 18 for the hot water storage tank, and a ball tap 19 that opens a valve to supply water when the water level in the hot water storage tank 17 drops below a set water level, and closes the valve to automatically stop water supply when the water level reaches the set level. Hot water tank 17
A hot water supply pump 21 is provided to supply hot water. As shown in the refrigerant circuit diagram in FIG. 2, the outdoor unit 1 includes an outdoor heat exchanger 22 as a heat exchanger for releasing heat, an outdoor fan 22a, a compressor 23 for circulating refrigerant, and a liquid receiver. 24, accumulator 25, 25, first and second four-way switching valve SV ₁ ,
SV ₂ , first to fourth electric expansion valves EV ₀ , EV ₁ ,
EV ₂ , EV ₃ , first and second liquid shutoff valves V ₁ , V ₂ ,
first and second gas shutoff valves V ₃ , V ₄ , and
A check valve _V5 is provided. Each of the indoor units 6, 6 is equipped with an indoor heat exchanger 26 and an indoor fan 27. The bathroom heating unit 4 is also equipped with a bathroom heating heat exchanger 28 and a blower fan 29. In FIG. 1, 30 is a ventilation fan for ventilating the inside of the bathroom 5. The first and second four-way switching valves SV ₁ , SV ₂ and the first to fourth electric expansion valves EV ₀ , EV ₁ ,
Each of the EV ₂ and EV ₃ is configured to automatically control its operation using a control means, and the operation is controlled as shown in the table below to switch between hot water supply operation mode, heating operation mode, reheating/drying (bath heating) driving mode,
Cooling operation mode, hot water supply and heating in a state where the cooling exhaust heat can be used (hot water supply + cooling) operation mode, recovering residual hot water exhaust heat and recovering heat from the hot water in the bathtub 3 for cooling. An operation mode that performs hot water supply and heating while making use of the generated heat (hot water supply + bath waste heat recovery), an operation mode that performs heating and reheating/drying in parallel (heating + bath heating), and a bathtub 3 for cooling. An operation mode in which heat recovery from the hot water inside the bathtub 3 and cooling are performed in parallel (cooling + bath waste heat recovery), and heat recovery from the hot water in the bathtub 3 for recovering residual hot water waste heat and cooling. The recovered heat can now be used to heat hot water and cool it in parallel (hot water supply + cooling + bath waste heat recovery) by selecting one of the operating modes. There is.

【table】

[Table] However, for each of the first and second four-way switching valves SV ₁ and SV ₂ , ◯ indicates the state of the solid line in the refrigerant circuit diagram, and × indicates the state of the broken line. First to fourth electric expansion valves EV ₀ , EV ₁ , EV ₂ ,
For each EV ₃ , △ is a constant opening state, ×
indicates a fully closed state, SH indicates a superheating control state, and FD indicates a supercooling control state. Regarding the circulation pump 10, ○ indicates the operating state;
× indicates a stopped state. In each of the above operation modes (hot water supply + bath waste heat recovery), (cooling + bath waste heat recovery), and (hot water supply + cooling + bath waste heat recovery), when hot water supply heating and cooling are not performed, the first electric expansion valve EV ₀ is fully opened, and the heat of the hot water in the bathtub 3 is transferred to the outdoor heat exchanger 2.
2, only cooling is performed by discharging heat to the outside air, and then operation is performed in the reheating/drying operation mode, the cooling operation mode, and the cooling-only operation mode by discharging heat to the outside air, respectively, according to the present invention. I will explain the state at the time. When operating in reheating/drying mode: Discharge port 23a of compressor 23 → first four-way switching valve
SV ₁ (solid line) → Second four-way switching valve SV ₂ (broken line) → First gas shutoff valve V ₃ → Bathroom heating heat exchanger 28 →
Bathtub heat exchanger 8 → 4th electric expansion valve EV ₃ (FD)
→ First liquid shutoff valve V ₁ → Liquid receiver 24 → First electric expansion valve EV ₀ (SH) → Outdoor heat exchanger 22 → Second four-way switching valve SV ₂ (broken line) → Accumulator 25,
25 → Forms a circulating refrigerant flow path with the suction port 23b of the compressor 23, and by operating the compressor 23 and driving the circulation pump 9 or the blower fan 29, the outdoor heat exchanger 22 cools the refrigerant from the outside. The absorbed heat is radiated to the hot water in the bathtub 3 by the bathtub heat exchanger 8, or is radiated into the bathroom 5, reheating the bath, and
The bathroom 5 is heated or used as a drying room for laundry, etc. When operating in cooling operation mode: Discharge port 23a of compressor 23 → first four-way switching valve
SV ₁ (solid line) → Second four-way switching valve SV ₂ (solid line) → Outdoor heat exchanger 22 → First electric expansion valve EV ₀ (constant opening) → Liquid receiver 24 → First liquid closing valve V ₁ →Second
Or third electric expansion valve EV ₁ (SH), EV ₂ (SH)
→ Indoor heat exchanger 26, 26 → First gas shutoff valve
V ₃ → second four-way switching valve SV ₂ (solid line) → accumulators 25, 25 → inlet 23b of compressor 23 to form a circulating refrigerant flow path, and indoor heat exchangers 26, 26 The amount of heat absorbed from the air is radiated to the outside by the outdoor heat exchanger 22, thereby cooling the room. When operating in cooling only mode: Discharge port 23a of compressor 23 → first four-way switching valve
SV ₁ (solid line) → 2nd four-way switching valve SV ₂ (solid line) → Actual outer heat exchanger 22 → 1st electric expansion valve EV ₀ (fully open)
→ Liquid receiver 24 → First liquid closing valve V ₁ → Fourth electric expansion valve EV ₃ → Bathtub heat exchanger 8 → Bathroom heating heat exchanger 28 → First gas closing valve V ₃ → Second four-way switching Valve SV ₂ (solid line) → Accumulator 25, 25 →
A circulating refrigerant flow path is formed with the suction port 23b of the compressor 23, and the amount of heat absorbed from the hot water in the bathtub 3 by the bathtub heat exchanger 8 is radiated to the outside by the outdoor heat exchanger 22. , the hot water in the bathtub 3 is cooled. FIG. 3 is an electrical circuit diagram, in which the water level sensor
Water level sensing signals from each of L ₀ , L ₁ , L ₂ , and L ₃ ,
In addition, the temperature signals from the hot water temperature sensor 16 are input to the bathtub CPU 31, and the hot water temperature setting signal from the hot water temperature setting switch section 32 that sets the temperature range of the hot water in the bathtub 3, and the water level that sets the amount of hot water in the bathtub 3. The set water level signal from the setting switch section 33 and the operating signal from the bath operating switch 34 are each input to the bathtub CPU 31 via the key matrix 35, and the CPU 31 drives the circulation pump 10 based on these signal inputs. A drive signal is output to each of the first relay coil R1, the second relay coil R2 that operates to open the hot water supply valve 11, and the third relay coil R3 that operates to open the water supply valve 13, and the initial hot water filling by the hot water filling control means is performed. At the same time, upon completion of the initial filling, a filling completion signal is output, and hot water is replenished after filling is completed. Note that the hot water temperature setting switch section 32 can change the hot water temperature setting by switching the heating switch SW after changing the hot water temperature setting.
This is now done by manipulating the The hot water filling completion signal from the bathtub CPU 31 is
In response to the hot water filling completion signal inputted to the outdoor side CPU 36 in the outdoor unit 1, the heat retention control means controls the first and second water temperature when the hot water temperature detected by the hot water temperature sensor 16 becomes lower than the set temperature range.
Controlling the operation of the four-way switching valves SV ₁ , SV ₂ and the first to fourth electric expansion valves EV ₀ , EV ₁ , EV ₂ , EV ₃ and driving the compressor 23 and the outdoor fan 22a, respectively, Bathtub heat exchanger 8
The water temperature detected by the water temperature sensor 16 is maintained within the set temperature range, and furthermore, when the water temperature in the bathtub 3 becomes higher than the set water temperature due to a change in the set water temperature, etc. The first hot water temperature adjusting means cools the water supply, and the second hot water temperature adjusting means cools the water using the bathtub heat exchanger 8. Next, the operations of the hot water level control means, the heat retention control means, and the first and second hot water temperature adjusting means will be explained using the flowchart shown in FIG. 4. First, as shown in Fig. 4a, the operation switch 3 is turned on.
4 to start operation (S1), open both the hot water supply valve 11 and the water supply valve 13 (turn ON),
Activate the forget-to-turn-off prevention timer. The forget-to-turn-off prevention timer is built into the bathtub CPU 31 and is set to, for example, 6 hours, and is reset after 6 hours or when the operation switch 34 is turned off. . Next, determine whether hot water and water have been supplied to a level HO that allows the operation of the circulation pump 10.
That is, it is determined whether a water level signal is detected from the water level sensor _L0 , and the process waits until the above-mentioned allowable level HO is reached (S3). After reaching the allowable level HO, it is determined whether the water level has reached the initially set water level (one of the water levels HH, HM, and HL) (S4). Immediately after reaching the allowable level HO, since the set water level has not been reached, the process moves to step S5 and operation by the circulation pump 10 is started. After this, in the processes from step S6 to step S13, hot water filling control is performed, and the hot water temperature is higher than the set temperature range, the hot water temperature is within the set temperature range, and the hot water temperature is set. The hot water supply valve 11 and the water supply valve 13 are respectively opened and closed depending on the state where the temperature is lower than the temperature, and an appropriate amount of hot water within the set temperature range is obtained. That is, for the water supply valve 13, the temperature is lower than the set temperature.
A differential is provided within the range of 0.5 to 1.5 degrees Celsius, and when the water temperature rises beyond a temperature 0.5 degrees Celsius lower than the set temperature, the water supply valve 13 is opened, and the water temperature is 1.5 degrees Celsius lower than the set temperature. The water supply valve 13 is configured to close when the temperature drops below the set temperature, and the water supply valve 11 is configured to close the differential valve within the range from 0.5°C higher than the set temperature to 1.0°C lower than the set temperature. When the hot water temperature drops to 1.0℃ lower than the set temperature, the hot water valve 11 is opened, and the water temperature is 0.5℃ lower than the set temperature.
The water supply valve 13 and the hot water supply valve 1 are configured to close the hot water supply valve 11 when the temperature rises above a high temperature.
1.The opening and closing frequency of each valve is minimized to obtain the appropriate amount of hot water at the appropriate temperature. To explain step by step, after the circulation pump 10 starts operating, the temperature difference obtained by subtracting the hot water temperature set by the hot water temperature setting switch section 32 from the hot water temperature detected by the hot water temperature sensor 16 is smaller than -1.5°C. If it is small, only the water supply valve 13 is closed (OFF) (S7), and the process returns to step S4. If it is determined in step S6 that the temperature difference is greater than -1.5℃, the process moves to step S8 and the temperature difference obtained by subtracting the set hot water temperature from the detected hot water temperature is 0.5.
℃, and when it is determined that the water temperature is high, the hot water valve 1 is turned on.
Close only 1 (OFF) (S9) and return to step S4. When it is determined in step S8 that the temperature difference is smaller than 0.5°C, the process moves to step S10, where it is determined whether the temperature difference obtained by subtracting the set hot water temperature from the detected hot water temperature is larger than -0.5°C, and it is determined whether the temperature difference is larger than -0.5°C. When it is determined that this is the case, the water supply valve 13 is opened (ON) (S11) and the process returns to step S4. When it is determined in step S10 that the temperature difference is smaller than -0.5°C, the process proceeds to step S12, where it is determined whether the temperature difference obtained by subtracting the set hot water temperature from the detected hot water temperature is smaller than -1.0°C. , when it is determined that the hot water supply valve 11 is small, the hot water supply valve 11 is opened (ON) (S13) and the process returns to step S4. here,
If it is determined that the temperature difference is greater than -1.0°C, the process returns to step S4. Then, in step S4, when it is determined that the water level has reached the set water level, it is assumed that hot water filling by the initial hot water filling means has been completed, and the process moves to step S14, where both the hot water supply valve 11 and the water supply valve 13 are closed (OFF). ), then step
Move to S15. Through these processes from step S2 to step S14, the water temperature in the bathtub 3 is lower than the set water temperature.
The initial hot water filling means is configured to supply a set amount of hot water within a set temperature range from 0.5°C higher to 1.5°C lower. At this time, a hot water filling completion signal is output from the bathtub CPU 31 to the outdoor side CPU 36. In step S15, as shown in FIG. 4b, it is determined whether the forget-to-turn-off prevention timer has timed up, that is, whether 6 hours have elapsed.
When 6 hours have passed, the operation switch 34 is automatically turned off (OFF) to stop the bath operation (S16). If 6 hours have not elapsed, the process moves to step S17, and it is determined whether the water level is at the set water level in order to see if the amount of hot water has decreased below the set water level due to the use of hot water for bathing. If the water level reaches the set level, the bath will be heated by reheating, or cooled down using the water supply or bathtub heat exchanger 8, and then heated for a set time of T minutes (for example, 15 minutes).
Determine whether it has passed. Here, if heating or cooling is not to be performed, such as after the initial filling of hot water or after replenishment of hot water, the judgment is YES and the process moves to step S19, where the circulation pump 10 is driven. If it is determined in step S18 that the set time has not elapsed, the process proceeds to step S20, where it is determined whether the heating switch has been turned on, that is, whether there has been a change in the set water temperature, and whether or not the heating switch has been turned on. If so, move on to step S19,
If it is not turned on, the process returns to step S15. After the circulation pump 10 is operated in step S19, it is determined whether the temperature difference obtained by subtracting the set hot water temperature from the hot water temperature detected by the hot water temperature sensor 16 is smaller than -0.5°C (S21), and the temperature difference is - 0.5℃
If it is smaller than , it is assumed that the water temperature is low and the bath heating is turned on, that is, the reheating operation by the bathtub heat exchanger 8 is started (S22). After that, it is determined whether the temperature difference obtained by subtracting the set hot water temperature from the hot water temperature detected by the hot water temperature sensor 16 is greater than 0.5°C (S23), and the temperature difference is determined to be 0.5°C.
℃, and if it is determined that the temperature has increased, the reheating is completed and the bath heating is turned off, that is, the reheating operation by the bathtub heat exchanger 8 is stopped and the circulation pump 10 is turned off ( S22) and return to step S15. Through these processes from step S21 to step S24, the heat retention control means is configured to carry out reheating operation using the bathtub heat exchanger 8 and maintain the water temperature in the bathtub 3 within the set temperature range. ing. In step S17, when it is determined that the water level is not the set water level, that is, when it is determined that the hot water has been used for bathing and has decreased below the set water amount, the process returns to step S5, and in the same manner as in the initial water filling process, Obtains the set amount of hot water within the set temperature range. In step S21, the temperature difference obtained by subtracting the set hot water temperature from the hot water temperature detected by the hot water temperature sensor 16 is -
If it is determined that the hot water temperature is not smaller than 0.5°C, the process moves to step S25, and as shown in FIG. In other words, if you reset the water temperature to a lower temperature due to a mistake in changing the water temperature setting, or if you reset the temperature to a lower temperature because you prefer low-temperature water, or even unexpectedly. If the water temperature is already high, the process moves to step S26 and the water supply valve 13 is opened (ON) to cool the water jug. Next, the process moves to step S27, and it is determined whether the temperature difference obtained by subtracting the set water temperature from the hot water temperature detected by the hot water temperature sensor 16 is smaller than 0.5°C, and when it is determined that it is small, the process moves to step S28. In order to end the water pitcher cooling, the water supply valve 13 is closed (OFF), the circulation pump 10 is stopped (OFF), and the process returns to step S15. Through these processes from step S26 to step S28, the first hot water temperature adjusting means is configured to cool the hot water in the bathtub 3 by supplying water. In step S27, the temperature difference obtained by subtracting the set hot water temperature from the hot water temperature detected by the hot water temperature sensor 16 is determined.
If it is determined that the temperature is higher than 0.5°C, the process moves to step S29, and it is determined whether a set time T minutes (for example, 3 minutes) has elapsed after the start of water pitcher cooling, and the hot water is turned off until the set time has elapsed. Continue cooling the jug until the temperature drops below the set temperature. After the start of water pitcher cooling, if the water temperature does not fall below the set temperature even after the set time elapses, the process moves to step S30, and in order to end the water pitcher cooling,
Close the water supply valve 13 (OFF). Thereafter, in order to perform cooling using the heat pump system (abbreviated as heat pump cooling), the refrigerant circuit is switched to the cooling operation state described above, the compressor 23 is activated (ON) (S31), and the hot water is heated in step S32. Cooling is continued until it is determined that the temperature difference obtained by subtracting the set hot water temperature from the hot water temperature detected by the temperature sensor 16 has become smaller than 0.5°C. If the temperature difference becomes smaller than 0.5°C, the compressor 23 is stopped (OFF) and the circulation pump 10 is stopped (OFF) in order to finish the heat pump cooling (S33), and then the process returns to step S15. . Through these processes from step S29 to step S33, the second hot water temperature adjusting means is configured to cool the hot water in the bathtub 3 using the bathtub heat exchanger 8. Further, in step S25, if it is determined that the temperature difference obtained by subtracting the set hot water temperature from the hot water temperature detected by the hot water temperature sensor 16 is smaller than 1.5°C, the process returns to step S15. In the above embodiment, when one operation switch 34 is turned on, the initial hot water filling means supplies hot water at the appropriate temperature and amount, that is, the initial hot water filling, the subsequent heat retention control, and the hot water supply. supply of and
This shows a system that automates everything related to bath operation, including cooling when the water temperature setting is reset to a lower temperature due to a mistake, and stopping control operations after the set time has elapsed. The present invention may be any device as long as it includes a first hot water temperature adjusting means that cools the water by supplying water and a second hot water temperature adjusting means that cools using the bathtub heat exchanger 8. Furthermore, in the above embodiment, the bathtub heat exchanger 8 is shown to be capable of reheating the bathtub.
In the present invention, for example, a gas heating device may be provided for reheating, and a bathtub heat exchanger 8 may be separately provided for cooling. The present invention is not limited to the outdoor heat exchanger 22, but also the hot water tank heat exchanger 18 and the indoor heat exchanger to release the heat recovered as the bathtub heat exchanger 8 is cooled. 26 may be used. (Effects of the Invention) As described above, according to the present invention, since cooling is initially performed by water supply, cooling can be performed quickly. If the water cannot be cooled to the predetermined temperature even after the set time has elapsed, cooling with the water pitcher is stopped, and the bathtub heat exchanger 8 Since it is cooled using a cooling system, it is now possible to reliably avoid overflow caused by cooling. Moreover, since the bathtub heat exchanger 8 is used for cooling only when the water jug cannot be used for cooling, the number of cooling operations is fewer than when the bathtub heat exchanger 8 is used for cooling all the time, and the power consumption is reduced. It has become possible to perform cooling economically. Furthermore, since the water temperature is low in winter, it can be cooled to a specified temperature almost only by water supply, and the bathtub heat exchanger 8
Cooling using a refrigerant tends to be concentrated in the summer when the water temperature is high, so if it is used in conjunction with an air conditioner that cools and heats the room and the heat source side unit 1 is also used, the refrigerant circuit will Because it is a cycle, there is no interruption in cooling operation.
It is sufficient to simply switch the valve mechanism so that the refrigerant is supplied in parallel, and there is an advantage that it can be easily used in combination with an air conditioner.

[Brief explanation of drawings]

FIG. 1 is a system configuration diagram of a bath water temperature control device according to an embodiment of the present invention, FIG. 2 is a refrigerant circuit diagram, and FIG.
The figure is an electric circuit diagram, FIG. 4 is a flowchart illustrating the operation of the hot water filling control means and the subsequent heat retention control means, and FIG. 5 is a configuration diagram of a conventional example. 1... Outdoor unit as a heat source side unit,
8... Heat exchanger for bathtub, 13... Water supply valve, 16...
... Hot water temperature sensor, 22 ... Outdoor heat exchanger as a heat exchanger for heat release, 23 ... Compressor.

Claims (1)

[Scope of Claims] 1. A heat exchanger 8 for a bathtub; a heat exchanger 22, 18, 26 for heat release; and a heat exchanger 22, 18, 26 for heat release and the heat exchanger 8 for a bathtub; A compressor 23 circulates and flows the refrigerant so that the bathtub heat exchanger 8 acts as an evaporator and the heat release heat exchangers 22, 18, and 26 act as condensers.
and a water supply valve 13 that opens and closes to supply water to the bathtub 3.
and a water temperature sensor 16 that detects the temperature of the water in the bathtub 3.
and a first hot water supply valve that opens the water supply valve 13 when the hot water temperature detected by the hot water temperature sensor 16 is higher than the set temperature, and closes the water supply valve 13 when the detected hot water temperature falls below the set temperature. If the detected hot water temperature has not decreased below the set temperature even after the opening time of the water supply valve 13 by the first hot water temperature adjustment means has elapsed, the water supply valve 13 is closed. operating the compressor 23, and
A bath water temperature regulating device comprising a second hot water temperature regulating means for stopping the compressor 23 when the detected water temperature falls below a set temperature.