JPH11325590A - Heat pump type bath water heater system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a recovery heat amount of a residual hot water heat of a bathtub and to enhance its efficiency. SOLUTION: The heat pump type bath water heater system comprises a heat recovery refrigerant circuit having a compressor 1, a condenser 2, a first pressure reducing means 3 and a heat recovery heat exchanger 4 sequentially connected, a natural heat utilizing refrigerant circuit having the compressor 1, the condenser 2, a second pressure reducing means 6 and an evaporator 7 sequentially connected, a switching means 9, a hot water supply heat exchanger 10, a hot water storage tank 11, a bath heat exchanger 13, a bathtub 14, a bath pump 15, a temperature detecting means 17 for detecting a water temperature of a bath circuit, and an operation control means 18. Thus, the means 18 switches the means 9 when a detected temperature of the means 17 is lowered to a firsts set temperature to operate by the natural heat utilizing refrigerant circuit, then switches the means 9 when the detected temperature of the means 17 is raised to a second set temperature of a higher temperature than the first set temperature, and operates the heat recovery refrigerant circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply system using a heat pump.

[0002]

2. Description of the Related Art Conventionally, a bath system using a heat pump of this type is disclosed in Japanese Patent Application Laid-Open No. 7-71839. Hereinafter, the related art will be described with reference to the drawings.
FIG. 9 is a configuration diagram of a bath system using a conventional heat pump. In FIG. 9, during the hot water supply operation using waste heat from the bathtub, the on-off valves 56a and 56d are opened to collect the hot water in the bathtub through the waste heat use heat exchanger 4, and the hot water is stored in the condenser 2 for storage.

[0003]

However, in the conventional heat pump system, when the bathtub waste heat is used, the bathtub water cooled by heat exchange in the waste heat utilization heat exchanger returns to the bathtub as low-temperature water. Then, in the bathtub, a density difference occurs between the remaining fluid and the returned low-temperature water fluid, and the returned low-temperature water stays at the lower portion of the bathtub, and the remaining remaining hotwater stays at the upper portion of the bathtub. Therefore, a temperature difference occurs between the upper and lower portions in the bathtub. And since the bathtub connection opening to the waste heat utilization heat exchanger is installed in the lower part of the bathtub, the low-temperature water in the lower part of the bathtub flows into the waste heat utilization heat exchanger again, is cooled and returns to the bathtub, Stay at the bottom. Therefore, as the operation progresses, the temperature difference between the upper and lower portions of the bathtub in the bathtub becomes gradually remarkable, and particularly when returning to the bathtub at a low flow rate, the speed of inflow into the bathtub is slow, so that the remaining hot water in the bathtub cannot be agitated. Is remarkable. Therefore, since the remaining hot water below the bathtub connection port for connecting the bathtub and the waste heat utilization heat exchanger is used for waste heat, the amount of hot water that can be used for waste heat is small. The operation efficiency is low because the temperature of the remaining hot water drops in a short time after the start of the operation, and the lowered remaining hot water is collected.

[0004] The present invention is to solve the above problems,
It is an object of the present invention to provide an energy-saving water heater that improves the amount of heat recovered from the bathtub remaining hot water and realizes high-efficiency operation.

[0005]

In order to solve the above-mentioned problems, the present invention provides a heat recovery refrigerant circuit in which a compressor, a condenser, a first pressure reducing means, and a heat recovery heat exchanger are sequentially connected;
A natural heat utilization refrigerant circuit in which a condenser, a second pressure reducing means, an evaporator for collecting atmospheric heat or solar heat are sequentially connected,
Switching means provided at the refrigerant inlets of the pressure reducing means and the second pressure reducing means for switching between the heat recovery refrigerant circuit and the natural heat utilization refrigerant circuit, a hot water supply heat exchanger having a heat exchange relationship with the condenser, and a hot water supply heat exchanger A hot water supply circuit comprising a hot water storage tank for storing hot water, a bath heat exchanger having a heat exchange relationship with a heat recovery heat exchanger, a bath circuit comprising a bathtub and a bath pump, and a temperature detecting means for detecting a water temperature of the bath circuit. When the detected temperature of the temperature detecting means decreases to the first set temperature during the operation by the heat recovery refrigerant circuit, the switching means is switched to the operation by the natural heat utilizing refrigerant circuit while the bath pump is continuously operated, and thereafter,
The second temperature, which is higher than the first set temperature, detected by the temperature detecting means.
A heat pump type bath hot water supply system having operation control means for switching the switching means to operation by the heat recovery refrigerant circuit again when the temperature rises to the set temperature.

[0006] With the above configuration, in the operation of heating tap water using the remaining hot water heat of the bathtub and storing hot water in the hot water storage tank, the heat of the remaining hot water sent from the bathtub is transferred to the refrigerant flowing through the heat recovery heat exchanger. To collect heat. Then, the refrigerant is heated to a high temperature and a high pressure by a compressor, and the heat of condensation of the refrigerant is radiated by the condenser 2 to heat water through the hot water supply heat exchanger, and the heated water is stored in the hot water storage tank. Further, although the remaining hot water absorbed by the bath heat exchanger is returned to the bathtub again, the density has increased due to the temperature drop. As a result, a difference in density occurs between the high-temperature remaining hot water that does not circulate, and the water stays below the inlet to the bathtub. Then, the remaining hot water near the bathtub connection port connected to the bath heat exchanger flows into the bath heat exchanger again, is cooled, and returns to the bathtub. By continuing this operation, the low-temperature remaining hot water in the lower part of the bathtub is always used for heat collection, so the temperature difference in the remaining hot water in the upper part and lower part of the bathtub becomes remarkable, and the remaining hot water flowing out of the bathtub gradually becomes low-temperature water. .

When the remaining hot water having dropped to the first set temperature begins to circulate in the bath circuit, the switching means is switched to perform operation by the natural heat utilizing refrigerant circuit, thereby collecting atmospheric heat or solar heat and collecting refrigerant by the condenser. The condensed heat is radiated to heat the water through the hot water supply heat exchanger and stored in the hot water storage tank. The bathtub remaining hot water is circulated through the bath circuit by the bath pump and flows into the bathtub.At this time, the heat flows into the bathtub without absorbing heat, so there is no difference in density with the remaining hot water. Stir.

Accordingly, the difference in the temperature of the remaining hot water between the upper and lower portions of the bathtub is reduced, the temperature of the hot water at the upper portion of the bathtub decreases, and the temperature of the water at the lower portion of the bathtub increases. When the temperature of the remaining hot water at the lower part of the bathtub rises to the second set temperature and flows out of the bath circuit, the switching means is switched again to perform the operation by the heat recovery refrigerant circuit.
Therefore, the remaining hot water in the bath tub is collected, and when the temperature becomes low, the operation is switched to a hot water storage operation for collecting atmospheric heat or solar heat, and the bath pump is continuously operated to stir the remaining hot water above and below the bath tub to lower the hot water temperature in the lower part of the bath tub. In order to raise it and perform the heat recovery operation again,
The amount of heat recovered from the remaining hot water in the bathtub is significantly improved.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be embodied in the forms described in the claims to achieve the above object. That is, as in the first aspect of the present invention, the compressor, the condenser, the first
And a heat recovery refrigerant circuit in which a pressure recovery means and a heat recovery heat exchanger are sequentially connected, and a natural heat utilization refrigerant circuit in which a compressor, a condenser, a second pressure reduction means, and an evaporator for collecting atmospheric heat or solar heat are sequentially connected. Switching means provided at the refrigerant inlets of the first pressure reducing means and the second pressure reducing means for switching between the heat recovery refrigerant circuit and the natural heat utilization refrigerant circuit; a hot water supply heat exchanger having a heat exchange relationship with the condenser; A hot water supply circuit consisting of a hot water storage tank for storing hot water of the heat exchanger, a bath heat exchanger having a heat exchange relationship with the heat recovery heat exchanger, a bath circuit consisting of a bathtub and a bath pump, and a temperature for detecting the water temperature of the bath circuit. The temperature detected by the temperature detecting means during operation by the detecting means and the heat recovery refrigerant circuit is the first temperature.
When the temperature drops to the set temperature, the switching means is switched to the operation by the natural heat utilizing refrigerant circuit while the bath pump is continuously operated, and then the temperature detected by the temperature detecting means rises to the second set temperature higher than the first set temperature. At this time, the present invention can be implemented by including an operation control means for switching the switching means again to the operation by the heat recovery refrigerant circuit.

According to this embodiment, the heat of the remaining hot water sent from the bathtub is collected by the refrigerant flowing through the heat recovery heat exchanger. Then, the refrigerant is heated to a high temperature and a high pressure by a compressor, and the heat of condensation of the refrigerant is radiated by the condenser to heat the water through the hot water supply heat exchanger, and the heated water is stored in the hot water storage tank. On the other hand, the remaining hot water that has been absorbed by the bath heat exchanger and has dropped in temperature flows into the bathtub again, but stays below the inflow port that flows into the bathtub due to a difference in density with the high-temperature remaining hot water that does not circulate. Then, the remaining hot water below the bathtub connection port connected to the bath heat exchanger flows into the bath heat exchanger again, is cooled, and returns to the bathtub. By continuing this operation, the low-temperature remaining hot water below the bathtub connection port is always used for heat collection, so that the temperature difference between the upper and lower portions of the bathtub becomes remarkable.

When the remaining hot water drops to the first set temperature and starts to circulate in the bath circuit, the switching means is switched to operate by the natural heat utilizing refrigerant circuit, to collect atmospheric heat or solar heat and to collect refrigerant in the condenser. The heat of condensation is radiated to heat the water through the hot water supply heat exchanger and stored in the hot water storage tank. The bathtub remaining hot water is circulated through the bath circuit by the bath pump and flows into the bathtub. At that time, the heat flows into the bathtub without being absorbed, so that there is no difference in density from the remaining bathwater and the bathtub remaining hot water is stirred. Therefore, the difference in the remaining hot water temperature between the upper and lower portions of the bathtub is reduced, the temperature of the hot water at the upper portion of the bathtub decreases, and the temperature of the water at the lower portion of the bathtub increases.

When the temperature of the remaining hot water in the lower part of the bathtub rises to the second set temperature and flows into the bath circuit, the switching means is switched again to operate the heat recovery refrigerant circuit.

[0013] Therefore, the remaining hot water in the lower part of the bathtub is first collected, and when the temperature becomes low, the operation is switched to a hot water storage operation for collecting atmospheric heat or solar heat, and the bath pump is continuously operated to stir the remaining hot water above and below the bathtub. Since the lower part hot water temperature is raised and the heat recovery operation is performed again, the amount of heat recovered from the remaining hot water in the bathtub is significantly improved, and a highly efficient hot water storage operation can be realized. Furthermore, since the hot-water storage operation is performed without stopping the heat pump, a stable hot-water storage temperature can be obtained.

Further, in addition to the above-described configuration, as in the second aspect of the present invention, there are provided drainage means for draining the remaining hot water in the bathtub of the bath circuit, temperature detecting means for detecting the water temperature of the bath circuit, and a heat recovery refrigerant circuit. During operation, the temperature detected by the temperature detecting means is the first
When the temperature has dropped to the set temperature, the drainage means is opened to drain the bathtub water, and the switching means is switched to the operation by the natural heat utilizing refrigerant circuit. Thereafter, the temperature detected by the temperature detection means is higher than the first set temperature. 2 When the temperature rises to the set temperature,
An operation control unit for closing the drainage unit again and switching the switching unit to the operation by the heat recovery refrigerant circuit is provided, and in the operation of heating the tap water using the remaining hot water in the bathtub and storing the hot water in the hot water storage tank, heat is absorbed. Since the circulating water returning to the bathtub stays in the lower part of the bathtub, the difference between the upper and lower remaining hot water temperatures in the bathtub increases as the operation progresses.

When the low-temperature remaining hot water in the lower portion drops to the first set temperature and starts flowing out into the bath circuit, the drain means is opened to discharge the low-temperature remaining hot water, and the switching means is operated by the natural heat utilizing refrigerant circuit. Switch to operation. Then, the hot water is stored in the hot water storage tank by collecting atmospheric heat or solar heat and releasing heat of condensation of the refrigerant. Further, since the remaining hot water is drained from the bath circuit, the level of the remaining hot water in the bathtub drops, and the high-temperature remaining hot water in the upper part of the bathtub starts to flow into the bath circuit.

When the remaining hot water that has risen to the same temperature as the second set temperature starts to circulate, the drainage means is closed again and the switching means is switched again to the heat recovery refrigerant circuit to collect the high-temperature remaining hot water. Perform hot water storage operation. Therefore, since high-temperature remaining hot water can always be collected, high-efficiency operation can be realized.
Also, since the atmospheric heat is collected and the hot-water storage operation is performed even during the drainage of the low-temperature remaining hot water in the bathtub, the amount of boiling water in the hot-water storage tank increases.

Further, in addition to the above configuration, the drainage means provided in the bath circuit on the outlet side of the bath pump, and the temperature detected by the temperature detection means during the operation by the heat recovery refrigerant circuit may be set to the second temperature. When the temperature has dropped to the first set temperature, the drain means is opened to drain the bathtub water, and the switching means is switched to the operation by the refrigerant circuit utilizing natural heat. Thereafter, the temperature detected by the temperature detecting means is higher than the first set temperature. When the temperature has risen to the second set temperature, the operation control means for closing the drain means again and switching the switching means to the operation by the heat recovery refrigerant circuit, and the operation when the detected temperature of the temperature detecting means has dropped to the first set temperature. In the operation of receiving tap water from the control unit and pump control means for maximizing the flow rate of the bath pump, heating the tap water using the remaining hot water in the bathtub and storing the hot water in the hot water storage tank, When the remaining hot water temperature which circulates the road is lowered to the first predetermined temperature, draining cold residue hot water to the bath pump maximum flow rate by opening the drainage means. Therefore, since the drainage time is shortened, the time when the high-temperature remaining hot water in the upper part of the bathtub starts to flow into the bath heat exchanger of the bath circuit is shortened, and the remaining hot-water heat can be recovered in a short time. In addition, heat can be sufficiently recovered even during a limited time such as during late night hours.

Further, in addition to the above-mentioned structure, a drain means is provided on the outflow side of the bath heat exchanger so that the low-temperature residual hot water is drained after flowing out of the bath heat exchanger. And drain out the scale and suspended matter in the bath heat exchanger. In particular, the effect is remarkable because the water is drained at the maximum flow rate of the bath pump. Therefore, since the heat transfer surface in the bath heat exchanger is washed, the heat exchange efficiency is improved and the reliability is improved without clogging of the flow path.

A heat recovery refrigerant circuit in which a compressor, a four-way valve, a condenser, a first pressure reducing means, and a heat recovery heat exchanger are sequentially connected,
A bath heating refrigerant circuit in which a compressor, a four-way valve, a heat recovery heat exchanger, a check valve provided in parallel with the first pressure reducing means, a second pressure reducing means, and an evaporator for collecting atmospheric heat or solar heat are sequentially connected. And a hot water supply circuit comprising a hot water supply heat exchanger having a heat exchange relationship with the condenser and a hot water storage tank for storing hot water of the hot water supply heat exchanger, a bath heat exchanger having a heat exchange relationship with the heat recovery heat exchanger, a bathtub, A bath circuit consisting of a bath pump, operating means for operating the terminal equipment for reusing bath water, temperature setting means for setting the water temperature for reusing the bath water in the terminal equipment, and from the bath heat exchanger outlet to the bathtub Flow path switching means for switching a return flow path and a water discharge flow path for discharging water to a terminal device; a bath temperature detecting means for detecting a water temperature between the bath heat exchanger and the flow path switching means; The path switching means is switched to the outflow channel side, When the detected temperature of the bath temperature detecting means is higher than the set temperature of the temperature setting device, the four-way valve is switched to operate with the heat recovery refrigerant circuit, and conversely, the detected temperature of the bath temperature detecting means is higher than the set temperature of the temperature setting means. When the temperature is low, operation control means for switching the four-way valve so as to operate with the bath heating refrigerant circuit is provided.

When the remaining hot water in the bath tub is poured into a washing machine, a toilet or the like for reuse, the flow path switching means is switched to the outflow flow path, and when the remaining hot water temperature is higher than the water temperature desired to be reused. By operating the heat recovery refrigerant circuit, the remaining hot water is collected, and the collected low-temperature remaining hot water is sent to the terminal device via the flow path switching means. The collected refrigerant in the heat recovery refrigerant circuit heats the water in the hot water supply circuit via the hot water supply heat exchanger in the condenser, and stores the heated water in the hot water storage tank.

When the temperature of the remaining hot water is lower than the temperature of the water to be reused, the four-way valve is switched so that the refrigerant discharged from the compressor flows into the heat recovery heat exchanger. The bathtub remaining hot water is heated by the bath heat exchanger and sent to the terminal equipment via the flow path switching means. Therefore, since the remaining hot water in the bathtub can be cooled and heated, for example, relatively high-temperature hot water can be poured into the initial washing with a lot of dirt, and then, at the rinsing stage, the water can be poured at the water temperature recovered to the city water temperature level. The use can be expanded and the remaining hot water can be used effectively, which can save energy and save water.

In addition to the above configuration, the flow rate control means for varying the flow rate of the bath pump and the temperature detected by the bath temperature detecting means coincide with the set temperature of the temperature setting means. Pump control means for controlling the flow rate of the bath pump by sending it to the flow rate control means, and when the remaining hot water in the bath tub is poured into a washing machine, toilet, etc. and reused, the temperature of the hot water at the outlet of the bath heat exchanger is determined by the terminal. Since water is supplied to the terminal device by controlling the flow rate of the bath pump so that the temperature becomes desired to be reused in the device, water can be injected at the temperature desired to be reused in the terminal, thereby improving convenience.

Further, in addition to the above configuration, the rotation speed control means for changing the rotation speed of the compressor, the temperature detected by the bath temperature detection means and the temperature set by the temperature setting means coincide with each other. The compressor is provided with compressor control means for transmitting to the rotation number control means to perform the rotation number control of the compressor so that the remaining hot water in the bathtub is poured into a washing machine and the like, and is reused.
When the outlet temperature of the bath heat exchanger is significantly different from the set temperature of the terminal, the operation frequency of the compressor is increased to operate with a large cooling capacity or a large heating capacity. Therefore, it is possible to cool or heat the bathtub remaining hot water to the set temperature in a short time, so that the waiting time until it can be used in the terminal device can be reduced.

Further, in addition to the above-described configuration, the four-way valve is provided when the temperature detected by the freezing temperature detecting means drops to a predetermined temperature. Is switched to a bath heating refrigerant circuit, and operation control means for heating the bath water with the heat recovery heat exchanger by causing the refrigerant discharged from the compressor to flow to the heat recovery heat exchanger is provided. When the remaining hot water in the bath circuit reaches the freezing temperature after recovering the heat of the remaining hot water, it is switched to the bath heating refrigerant circuit to allow the refrigerant discharged from the compressor to flow to the heat recovery heat exchanger, and the heat is recovered by the heat recovery heat exchanger. Heat the water. Therefore, the piping of the bath circuit does not freeze and burst,
The reliability of the equipment is improved.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. Note that, in the conventional example and each embodiment, components having the same configuration and the same operation are denoted by the same reference numerals,
Some description is omitted.

(Embodiment 1) FIG. 1 is a configuration diagram of a heat pump type bath hot water supply system according to Embodiment 1 of the present invention.

In FIG. 1, 1 is a compressor, 2 is a condenser,
Reference numeral 3 denotes a first decompression unit, and 4 denotes a heat recovery heat exchanger. The compressor 1, the condenser 2, the first decompression unit 3, and the heat recovery heat exchanger 4
Are sequentially connected to form a heat recovery refrigerant circuit 5. Reference numeral 6 denotes a second decompression unit, and reference numeral 7 denotes an evaporator, which collects atmospheric heat or solar heat. Reference numeral 8 denotes a natural heat utilizing refrigerant circuit, which is configured by sequentially connecting the compressor 1, the condenser 2, the second pressure reducing valve 6, and the evaporator 7. 9 is a switching means, and the first decompression means 3
Further, the heat recovery refrigerant circuit 5 and the natural heat utilization refrigerant circuit 8 are switched by being provided at the refrigerant inflow port of the second decompression means 6. A hot water supply heat exchanger 10 has a heat exchange relationship with the condenser 2. 1
A hot water storage tank 1 stores hot water heated by the hot water supply heat exchanger 10.

A hot water supply pump 12 circulates water in a hot water supply circuit 13 including a hot water supply heat exchanger 10 and a hot water storage tank 11. Reference numeral 14 denotes a bath heat exchanger, which has a heat exchange relationship with the heat recovery heat exchanger 4. 15 is a bathtub, 16 is a bath pump, 17 is a bath circuit, a bath heat exchanger 14, a bathtub 1
5. It consists of a bath pump 16. Reference numeral 18 denotes a temperature detecting means for detecting a circulating water temperature of the bath circuit 17. Reference numeral 19 denotes operation control means. When the temperature detected by the temperature detection means 18 decreases to the first set temperature during operation by the heat recovery refrigerant circuit 5,
While the bath pump 16 is continuously operated, the switching means 9 is switched to the operation using the natural heat utilizing refrigerant circuit 8, and then, when the temperature detected by the temperature detecting means 18 rises to the second set temperature higher than the first set temperature, again. The switching means 9 is switched to the operation by the heat recovery refrigerant circuit 5.

The operation and operation of the above configuration will be described. In an operation of heating tap water using the remaining hot water in the bathtub and storing the hot water in the hot water storage tank, the heat of the remaining hot water sent from the bathtub 15 is collected by the refrigerant flowing through the heat recovery heat exchanger 4. Then, the refrigerant is heated to a high temperature and high pressure by the compressor 1 and the heat of condensation of the refrigerant is radiated by the condenser 2 so that the hot water supply heat exchanger 10
, And the heated water is stored in the hot water storage tank 11. Further, although the remaining hot water absorbed by the bath heat exchanger 14 is returned into the bathtub 15 again, the density has increased due to the temperature drop. As a result, a difference in density is generated between the high-temperature hot water that does not circulate, and the water stays below the inlet to the bathtub 15.

Then, the remaining hot water near the connection port of the bathtub 15 connected to the bath heat exchanger 14 flows into the bath heat exchanger 14 again, is cooled, and returns to the bathtub 15. By repeating this operation, the low-temperature remaining hot water in the lower part of the bathtub 15 is always used for heat collection, so that the difference in the remaining hot water temperature in the upper part and lower part of the bathtub 15 becomes remarkable, and the remaining hot water flowing out of the bathtub 15 gradually becomes low temperature. It becomes water. When the remaining hot water that has dropped to the first set temperature starts circulating in the bath circuit 17, the switching means 9 is switched to operate the natural heat utilizing refrigerant circuit 8 to collect atmospheric heat or solar heat, and the refrigerant is collected in the condenser 2 by the condenser 2. The condensed heat is radiated to heat the water via the hot water supply heat exchanger 10 and stored in the hot water storage tank 11. In addition, the remaining hot water in the bathtub circulates through the bath circuit 17 by the bath pump 16 and flows into the bathtub 15. At this time, the hot water flows into the bathtub 15 without heat absorption, so that there is no difference in density with the remaining hot water. Stir the hot water remaining in the bathtub.

Accordingly, the difference in the temperature of the remaining hot water between the upper and lower portions of the bathtub 15 is reduced, and the temperature of the hot water above the bathtub 15 is lowered.
The water temperature at the bottom of the tower rises. When the temperature of the remaining hot water in the lower part of the bathtub 15 rises to the second set temperature and flows out of the bath circuit 17, the switching valve 9 is switched again to operate the heat recovery refrigerant circuit 5. Therefore, the remaining hot water in the bath tub is collected, and when the temperature becomes low, the operation is switched to a hot water storage operation for collecting atmospheric heat or solar heat, and the bath pump 16 is continuously operated to stir the remaining hot water above and below the bath tub so that the hot water temperature in the lower part of the bath tub is reduced. And the heat recovery operation is performed again, so that the amount of heat recovered from the remaining hot water in the bathtub is significantly improved. Furthermore, since the hot-water storage operation is performed without stopping the heat pump, hot water can be stored in the hot-water storage tank at a stable hot water temperature.

(Embodiment 2) FIG. 2 is a configuration diagram of a heat pump type bath hot water supply system according to Embodiment 2 of the present invention.

In FIG. 2, reference numeral 20 denotes a drainage means, which comprises an openable / closable valve and is provided in the bath circuit 17 to drain the bathtub remaining hot water when it is opened. Reference numeral 21 denotes a temperature detecting means for detecting a circulating water temperature of the bath circuit 17. Reference numeral 22 denotes operation control means. When the temperature detected by the temperature detection means 21 decreases to the first set temperature during operation by the heat recovery refrigerant circuit 5, the drainage means 20 is opened to drain the bathtub water and to switch the switching means 9 Is switched to the operation by the natural heat utilizing refrigerant circuit 8, and thereafter, when the temperature detected by the temperature detecting means 21 rises to a second set temperature higher than the first set temperature, the drainage means 20 is again turned on.
Is closed and the switching means 9 is switched to the operation by the heat recovery refrigerant circuit 5.

The operation and operation of the above configuration will be described. In the operation of heating the tap water using the remaining hot water in the bathtub and storing the hot water in the hot water storage tank 11, the circulating water that has been absorbed and returned to the bathtub 15 stays in the lower part of the bathtub, so that the circulating water moves up and down in the bathtub as the operation progresses. The remaining hot water temperature difference becomes large. Then, when the low-temperature remaining hot water drops to the first set temperature and starts flowing out into the bath circuit 17, the drainage means 20 is opened to drain the low-temperature remaining hot water, and the switching means 9 is switched to the natural heat utilizing refrigerant circuit 8 Switch to operation by.

Then, hot water is stored in the hot water storage tank 11 by collecting atmospheric heat or solar heat and releasing heat of condensation of the refrigerant.

Further, since the remaining hot water is drained from the bath circuit 17, the level of the remaining hot water in the bathtub drops, and the high-temperature remaining hot water in the upper part of the bathtub 15 starts flowing into the bath circuit 17. Then, when the remaining hot water that has risen to the same temperature as the second set temperature starts to circulate, the drainage means 20 is closed again, and the switching means 9 is switched again to the heat recovery refrigerant circuit 5 to collect the high-temperature remaining hot water. Perform hot water storage operation. Therefore, since high-temperature remaining hot water can always be collected, high-efficiency operation can be realized. Also, since the atmospheric heat is collected and the hot-water storage operation is performed even during the drainage of the low-temperature remaining hot water in the bathtub, the amount of boiling water in the hot-water storage tank increases.

(Embodiment 3) FIG. 3 is a configuration diagram of a heat pump type bath hot water supply system according to Embodiment 3 of the present invention.

In FIG. 3, reference numeral 23 denotes a drainage means, which is provided in a bath circuit 17 on the outflow side of the bath pump 16 and is configured to open / close a valve to drain the remaining hot water in the bathtub 15 when it is opened. 2
Reference numeral 4 denotes operation control means. When the temperature detected by the temperature detection means 21 decreases to the first set temperature during operation by the heat recovery refrigerant circuit 5, the drainage means 23 is opened to drain the bathtub water and to switch the switching means 9 Is switched to operation by the refrigerant circuit 8 utilizing natural heat, and thereafter, the temperature detected by the temperature detecting means 21 becomes the first temperature.
When the temperature rises to the second set temperature higher than the set temperature, the drain valve 23 is closed again and the switching valve 9 is switched to the operation by the heat recovery refrigerant circuit 5. Reference numeral 25 denotes a pump control unit, which receives from the operation control unit 24 that the temperature detected by the temperature detection unit 21 has decreased to the first set temperature during operation by the heat recovery refrigerant circuit 5, and sets the bath pump 16 to the maximum flow rate. .

The operation and operation of the above configuration will be described. When the temperature of the remaining hot water circulating from the bathtub 15 to the bath circuit 17 decreases to the first set temperature during the operation of heating the tap water using the remaining hot water heat of the bathtub and storing the hot water in the hot water storage tank, the operation control means 24 Releases the drainage means 23 and sends it to the pump operation control means 24. Then, the pump control means 25 sets the bath pump 16 to the maximum flow rate. Therefore, low-temperature remaining hot water is drained at the maximum flow rate of the bath pump 16. Therefore, since the drainage time is shortened, the time when the high-temperature remaining hot water in the upper part of the bathtub starts to flow into the bath heat exchanger of the bath circuit is shortened, and the remaining hot-water heat can be recovered in a short time.
In addition, heat can be sufficiently recovered even during a limited time such as during late night hours.

(Embodiment 4) FIG. 4 is a configuration diagram of a heat pump type bath hot water supply system according to Embodiment 4 of the present invention.

In FIG. 4, reference numeral 26 denotes a drainage means, which comprises an openable / closable valve, is provided on the outflow side of the bath heat exchanger 14, and allows fluid to flow when opened.

The operation and operation of the above configuration will be described. When the temperature of the remaining hot water circulating from the bathtub to the bath circuit during the operation of heating the tap water using the heat of the remaining hot water in the bathtub and storing the hot water in the hot water storage tank to the bath circuit decreases to the first set temperature, the operation control means 24 causes the drainage means 26 to operate. Is released and transmitted to the pump control means 25. And the pump control means 25
Sets the bath pump 15 to the maximum flow rate. Therefore, at the time of drainage, the low-temperature remaining hot water flows out of the bath heat exchanger, and is then drained at the maximum flow rate of the bath pump, and the scale, floating matters, and the like in the bath heat exchanger flow out. Therefore, since the heat transfer surface in the bath heat exchanger is washed, the heat exchange efficiency is improved and the reliability is improved without clogging of the flow path.

(Embodiment 5) FIG. 5 is a configuration diagram of a heat pump type bath hot water supply system according to Embodiment 5 of the present invention.

In FIG. 5, reference numeral 27 denotes a compressor, 28 denotes a four-way valve, 29 denotes a condenser, 30 denotes a first pressure reducing means, 31 denotes a heat recovery heat exchanger, and the compressor 27, the four-way valve 28, the condenser 2
9. A heat recovery refrigerant circuit 32 in which the first pressure reducing means 30 is sequentially connected is configured. A check valve 33 is provided in parallel with the first pressure reducing means 30. 34 is a second decompression means,
An evaporator 35 collects atmospheric heat or solar heat. A bath heating refrigerant circuit 36 has a configuration in which a compressor 27, a four-way valve 28, a heat recovery heat exchanger 29, a check valve 33, a second pressure reducing means 34, and an evaporator 35 are sequentially connected. 37
Is an operation means, which is an operation switch of the terminal device 38 for reusing the remaining hot water in the bathtub 15. Reference numeral 39 denotes a temperature setting means for setting a water temperature at which the bath water is reused by the terminal device 38.

Numeral 40 denotes a flow path switching means, which is a flow path returning from the outlet of the bath heat exchanger 14 to the bathtub 15 and a terminal device 38.
Switch the outflow channel for sending water to. 41 is a bath temperature detecting means for detecting a water temperature between the bath heat exchanger 14 and the flow path switching means 40. Reference numeral 42 denotes an operation control means, which detects a signal from the operation means 37 and switches the flow path switching means 40 to the water discharge flow path side. When the detected temperature of the bath temperature detection means 41 is higher than the temperature set by the temperature setting means 39, Heat recovery refrigerant circuit 3
The two-way valve 28 is switched so as to operate in the second mode, and when the detected temperature of the bath temperature detecting means 41 is lower than the temperature set by the temperature setting means 39, the four-way valve 28 is switched so as to operate in the bath heating refrigerant circuit 36.

The operation and operation of the above configuration will be described. In the case where the bathtub remaining hot water is poured into a washing machine, a toilet or the like for reuse, the signal of the operating means 37 is detected and the flow path switching means 40 is switched to the water discharge flow path side,
When the outlet water temperature of the bath heat exchanger 14 is higher than the water temperature desired to be reused, the operation is performed by the heat recovery refrigerant circuit 32 to collect the remaining hot water, and the remaining hot water which has been collected and cooled is switched. Water is sent to the terminal device 38 via the means 40.
The refrigerant in the heat recovery refrigerant circuit 32 that has collected heat is supplied to the condenser 29.
Then, the water in the hot water supply circuit 13 is heated via the hot water supply heat exchanger 10 and the heated water is stored in the hot water storage tank 11. Also,
When the outlet water temperature of the bath heat exchanger 14 is lower than the water temperature to be reused, the four-way valve 28 is switched so that the refrigerant discharged from the compressor 27 flows into the heat recovery heat exchanger 31 and the bath heating refrigerant circuit 36 The bath heat exchanger 14 is operated to heat the hot water remaining in the bath tub and to send the water to the terminal device 38 via the flow path switching means 40.

Therefore, since the remaining hot water in the bathtub can be cooled and heated, for example, relatively high-temperature hot water is poured in the initial washing with a lot of dirt, and then, at the rinsing stage, the hot water is recovered to the city water temperature level. The use of remaining hot water can be effectively used, and energy saving and water saving can be realized.

(Embodiment 6) FIG. 6 is a configuration diagram of a heat pump type bath hot water supply system according to Embodiment 6 of the present invention.

In FIG. 6, reference numeral 43 denotes a flow rate control means, which varies the flow rate of the bath pump 16.

Reference numeral 44 denotes a pump control means, which transmits to the flow rate control means 43 so that the temperature detected by the bath temperature detection means 41 and the temperature set by the temperature setting means 39 coincide with each other, and controls the flow rate of the bath pump 16.

The operation and operation of the above configuration will be described. A case where the outlet water temperature of the bath heat exchanger 14 is higher than a set temperature to be reused first when the remaining water in the bathtub is poured into a washing machine, a toilet, or the like for reuse will be described. In this case, since it is necessary to cool the bathtub remaining hot water, the four-way valve 28 is switched to operate with the heat recovery refrigerant circuit 32. Then, the pump control means 43 transmits to the flow rate control means 44 such that the flow rate of the bath pump 16 is reduced and the cooling temperature difference between the inlet and the outlet of the bath heat exchanger 14 is increased. The flow rate of the bath pump 16 is controlled so that the outlet water temperature of the exchanger 13 becomes the same. If the outlet water temperature of the bath heat exchanger 14 is lower than the set temperature for reuse, it is necessary to heat the water, so the four-way valve 28 is switched to operate in the bath heating refrigerant circuit 36.

Then, the pump control means 43 transmits to the flow control means 43 so as to reduce the flow rate of the bath pump 16 and increase the heating temperature difference between the inlet and the outlet of the bath heat exchanger 14, and set the temperature to be reused. And the flow rate of the bath pump 16 is controlled so that the outlet water temperature of the bath heat exchanger 14 becomes the same. Therefore, the outlet water temperature of the bath heat exchanger 14 is
In step 8, the flow rate of the bath pump 16 is controlled so as to reach the set temperature to be reused, and water is sent to the terminal device 38, so that water can be injected at the temperature to be reused in the terminal, thereby improving convenience.

(Embodiment 7) FIG. 7 is a configuration diagram of a heat pump type bath hot water supply system according to Embodiment 7 of the present invention.

In FIG. 7, reference numeral 45 denotes rotation speed control means for varying the rotation speed of the compressor 27.

Reference numeral 46 denotes a compressor control means, which transmits the data to the rotation speed control means 45 so that the temperature detected by the bath temperature detection means 41 and the temperature set by the temperature setting means 39 coincide with each other.
7 is performed.

The operation and operation of the above configuration will be described. In the case where the hot water remaining in the bathtub is poured into a washing machine or the like and reused, if the outlet temperature of the bath heat exchanger 14 is significantly different from the set temperature of the terminal device 38, the compressor 27
The operation frequency is increased to operate with large cooling capacity or large heating capacity. Therefore, it is possible to cool or heat the bathtub remaining hot water to the set temperature in a short time, so that the waiting time until it can be used in the terminal device can be reduced.

(Eighth Embodiment) FIG. 8 is a configuration diagram of a heat pump type bath hot water supply system according to an eighth embodiment of the present invention.

In FIG. 8, reference numeral 47 denotes freezing temperature detecting means for detecting the circulating water temperature of the bath circuit 17. Reference numeral 48 denotes an operation control means, which switches the four-way valve 28 to the bath heating refrigerant circuit 3 when the temperature detected by the freezing temperature detection means 47 falls to a predetermined temperature.
6 and the refrigerant discharged from the compressor 27 is changed to the heat recovery heat exchanger 3
The bath water is heated by the heat recovery heat exchanger 31 so as to flow to 1.

The operation and operation of the above configuration will be described. During midnight operation stoppage in the winter severe cold season,
When the remaining hot water in the bathtub of the bath circuit reaches the freezing temperature after the heat recovery of the remaining hot water, it is switched to the bath heating refrigerant circuit 36 to switch the compressor 27.
Is discharged to the heat recovery heat exchanger to heat the remaining hot water with the heat recovery heat exchanger. Therefore, the piping of the bath circuit is not frozen and ruptured, and the reliability of the equipment is improved.

[0060]

As is clear from the above description, according to the first aspect of the present invention, a heat recovery refrigerant circuit in which a compressor, a condenser, a first pressure reducing means, and a heat recovery heat exchanger are sequentially connected. And a natural heat utilization refrigerant circuit in which a compressor, a condenser, a second decompression means, an evaporator for collecting atmospheric heat or solar heat are sequentially connected, and refrigerant inlets of the first decompression means and the second decompression means Switching means for switching between a heat recovery refrigerant circuit and a natural heat utilization refrigerant circuit, a hot water supply heat exchanger having a heat exchange relationship with a condenser, a hot water supply circuit including a hot water storage tank for storing hot water of the hot water supply heat exchanger, A bath circuit comprising a bath heat exchanger, a bathtub, and a bath pump having a heat exchange relationship with the recovery heat exchanger;
A temperature detecting means for detecting a water temperature of the bath circuit; and, when the temperature detected by the temperature detecting means decreases to a first set temperature during operation by the heat recovery refrigerant circuit, the switching means switches the natural heat utilizing refrigerant while continuously operating the bath pump. Operation control means for switching the operation to the heat recovery refrigerant circuit when the temperature detected by the temperature detection means is increased to a second set temperature higher than the first set temperature. .

When the remaining hot water in the lower part of the bathtub drops to the first set temperature and starts circulating in the bath circuit, the switching means is switched to perform the operation using the natural heat utilizing refrigerant circuit.

Further, the bath pump agitates the remaining hot water in the bath tub while circulating in the bath circuit to reduce the difference in the remaining hot water temperature between the upper and lower portions of the bath tub. Then, when the remaining hot water in the lower part of the bathtub rises to the second set temperature and flows out of the bath circuit, the switching means is switched again to perform the operation by the heat recovery refrigerant circuit. Therefore, the remaining hot water heat in the lower part of the bathtub is first collected, and when the temperature becomes low, the operation is switched to a hot water storage operation for collecting atmospheric heat or solar heat, and the bath pump is continuously operated to stir the remaining hot water in the upper and lower parts of the bathtub to cool the hot water in the lower part of the bathtub. Since the temperature is raised and the heat recovery operation is performed again, the amount of heat recovered from the remaining hot water in the bathtub is significantly improved, and a highly efficient hot water storage operation can be realized. Furthermore, since the hot-water storage operation is performed without stopping the heat pump, a stable hot-water storage temperature can be obtained.

According to the second aspect of the present invention, in addition to the above-described structure, a drainage means for draining the remaining hot water from the bathtub of the bath circuit, a temperature detection means for detecting a water temperature of the bath circuit, and a heat recovery refrigerant When the temperature detected by the temperature detecting means drops to the first set temperature during the operation by the circuit, the drain means is opened to drain the bathtub water, and the switching means is switched to the operation by the natural heat utilizing refrigerant circuit. When the detected temperature of the means rises to a second set temperature higher than the first set temperature, the apparatus further comprises operation control means for closing the drain means again and switching the switching means to the operation by the heat recovery refrigerant circuit.

In the operation of heating the tap water using the remaining hot water in the bathtub and storing the hot water in the hot water storage tank, when the low-temperature low-temperature remaining hot water drops to the first set temperature and starts flowing out into the bath circuit, the drainage means To drain the low-temperature remaining hot water, switch the switching means to the operation using the natural heat utilizing refrigerant circuit, collect atmospheric heat or solar heat, radiate the condensation heat of the refrigerant, and store the hot water in the hot water storage tank. Then, because the remaining hot water is drained, the level of the remaining hot water in the bathtub drops, and the high-temperature remaining hot water in the upper part of the bathtub starts flowing into the bath circuit. When the temperature rises to the second set temperature, the drain valve is closed again and switched. The means is switched to the heat recovery refrigerant circuit again, and the hot remaining hot water is collected to perform the hot water storage operation. Therefore, since high-temperature remaining hot water can always be collected, high-efficiency operation can be realized. In addition, during the drainage of low-temperature remaining hot water in the bathtub, the air heat is collected and the hot-water storage operation is performed.
The amount of boiling water in the hot water storage tank increases.

According to the third aspect of the present invention, in addition to the above-described structure, the drainage means provided in the bath circuit on the outlet side of the bath pump, and the temperature detected by the temperature detection means during operation by the heat recovery refrigerant circuit. When the temperature has dropped to the first set temperature, the drain means is opened to drain the bathtub water, and the switching means is switched to the operation by the natural heat utilizing refrigerant circuit. Thereafter, the temperature detected by the temperature detecting means becomes lower than the first set temperature. When the temperature rises to the high second set temperature, the operation control means for closing the drain means again and switching the switching means to the operation by the heat recovery refrigerant circuit, and the detected temperature of the temperature detecting means has dropped to the first set temperature. Pump control means to receive the water from the operation control means and to make the bath pump the maximum flow rate, in the operation of heating the tap water using the remaining hot water of the bathtub and storing the hot water in the hot water storage tank, from the bathtub When the remaining hot water temperature which circulates to Lu circuit decreases to a first predetermined temperature, draining cold residue hot water to the bath pump maximum flow rate by opening the drainage means. Therefore, since the drainage time is shortened, the time when the high-temperature remaining hot water in the upper part of the bathtub starts to flow into the bath heat exchanger of the bath circuit is shortened, and the remaining hot-water heat can be recovered in a short time. In addition, heat can be sufficiently recovered even during a limited time such as during late night hours.

According to the fourth aspect of the present invention, in addition to the above-described structure, the drainage means is provided on the outflow side of the bath heat exchanger so that the low-temperature residual hot water is discharged during the drainage. After spilling out of the bath, drain the water and flush out the debris and suspended matter in the bath heat exchanger.

Particularly, the effect is remarkable because the water is drained at the maximum flow rate of the bath pump. Therefore, since the heat transfer surface in the bath heat exchanger is washed, the heat exchange efficiency is improved and the reliability is improved without clogging of the flow path.

According to the fifth aspect of the present invention, a heat recovery refrigerant circuit in which a compressor, a four-way valve, a condenser, a first pressure reducing means, and a heat recovery heat exchanger are sequentially connected; valve,
A heat recovery heat exchanger, a check valve provided in parallel with the first decompression means, a second decompression means, a bath heating refrigerant circuit sequentially connected with an evaporator for collecting atmospheric heat or solar heat, a condenser and heat A hot water supply circuit comprising a hot water supply heat exchanger having an exchange relationship and a hot water storage tank for storing hot water of the hot water supply heat exchanger, and a bath circuit comprising a bath heat exchanger, a bathtub and a bath pump having a heat exchange relationship with the heat recovery heat exchanger. Operating means for operating a terminal device for reusing bath water, temperature setting means for setting a water temperature for reusing bath water at the terminal device, a flow path for returning from a bath heat exchanger outlet to a bathtub, and a terminal device. A flow path switching valve for switching a flow path for water flowing out of the bath, a bath temperature detecting means for detecting a water temperature between the bath heat exchanger and the flow path switching valve, and a flow switching means for detecting a signal from the operating means to flow the flow path switching means. Switch to roadside, bath temperature detection means When the detected temperature is higher than the temperature set by the temperature setting device, the four-way valve is switched to operate in the heat recovery refrigerant circuit. Conversely, when the detected temperature of the bath temperature detecting means is lower than the temperature set by the temperature setting means, the bath heating refrigerant is used. Operation control means for switching the four-way valve so as to operate in a circuit is provided.

When the remaining hot water in the bath tub is poured into a washing machine, a toilet or the like for reuse, the flow path switching means is switched to the outflow flow path, and when the remaining hot water temperature is higher than the water temperature to be reused. Then, the operation is performed by the heat recovery refrigerant circuit, and the low temperature remaining hot water is supplied to the terminal device through the flow path switching means. When the remaining hot water temperature is lower than the water temperature to be reused, the four-way valve is switched so that the refrigerant discharged from the compressor flows into the heat recovery heat exchanger, and the compressor is operated in the bath heating refrigerant circuit, and the bath heat exchange is performed. The hot water remaining in the bathtub is heated by a heater and sent to the terminal equipment via the flow path switching means. Accordingly, the remaining hot water in the bathtub can be cooled and heated, so that the use of the remaining hot water in the bathtub can be expanded and the remaining hot water can be effectively used, so that energy saving and water saving can be realized.

According to the present invention, in addition to the above-described structure, the flow rate control means for varying the flow rate of the bath pump, the detected temperature of the bath temperature detecting means and the set temperature of the temperature setting means coincide with each other. Pump control means for controlling the flow rate of the bath pump by sending it to the flow rate control means so that the hot water at the outlet of the bath heat exchanger can be used when the remaining hot water in the bathtub is poured into a washing machine, toilet, etc. and reused. Since water is supplied to the terminal device by controlling the flow rate of the bath pump so that the temperature of the bath device becomes the temperature that can be reused by the terminal device, water can be injected at the temperature that is reused by the terminal device, and convenience is improved.

According to the seventh aspect of the present invention, in addition to the above-described structure, a rotation speed control means for varying the rotation speed of the compressor, a detection temperature of the bath temperature detection means and a set temperature of the temperature setting means are provided. The compressor is provided with compressor control means for controlling the rotation speed of the compressor by transmitting the rotation to the rotation speed control means so as to coincide with each other. When the temperature is significantly different from the set temperature of the terminal, the operation frequency of the compressor is increased to operate with a large cooling capacity or a large heating capacity. Therefore, it is possible to cool or heat the bathtub remaining hot water to the set temperature in a short time, so that the waiting time until it can be used in the terminal device can be reduced.

According to the invention of claim 8, in addition to the above-described structure, a freezing temperature detecting means for detecting a water temperature of the bath circuit, and a four-way detecting method when the detected temperature of the freezing temperature detecting means decreases to a predetermined temperature. Equipped with operation control means to switch the valve to the bath heating refrigerant circuit so that the refrigerant discharged from the compressor flows to the heat recovery heat exchanger and heat the bath water with the heat recovery heat exchanger. In the heat recovery heat exchanger, when the remaining hot water in the bath circuit reaches the freezing temperature after the heat recovery of the remaining hot water, it switches to the bath heating refrigerant circuit so that the refrigerant discharged from the compressor flows to the heat recovery heat exchanger. Heat the remaining hot water.
Therefore, the piping of the bath circuit is not frozen and ruptured, and the reliability of the equipment is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a heat pump type bath hot water supply system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a heat pump type bath hot water supply system according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a heat pump type bath hot water supply system according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a heat pump type bath hot water supply system according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of a heat pump type bath hot water supply system according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a heat pump type bath hot water supply system according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of a heat pump type bath hot water supply system according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of a heat pump type bath hot water supply system according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram of a conventional heat pump system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 First decompression means 4 Heat recovery heat exchanger 5 Heat recovery refrigerant circuit 6 Second decompression means 7 Evaporator 8 Natural heat utilization refrigerant circuit 9 Switching means 10 Hot water supply heat exchanger 11 Hot water storage tank 12 Hot water supply pump 13 Hot water supply circuit 14 Bath heat exchanger 15 Bathtub 16 Bath pump 17 Bath circuit 18 Temperature detection means 19 Operation control means 20 Drainage means 21 Temperature detection means 22 Operation control means 23 Drainage means 24 Operation control means 25 Pump control means 26 Drainage Means 27 Compressor 28 Four-way valve 29 Condenser 30 First pressure reducing means 31 Heat recovery heat exchanger 32 Heat recovery refrigerant circuit 33 Check valve 34 Second pressure reducing means 35 Evaporator 36 Bath heating refrigerant circuit 37 Operating means 38 Terminal Equipment 39 Temperature setting means 40 Channel switching means 41 Bath temperature detecting means 42 Operation control means 43 Flow control Stage 44 Pump control means 45 Rotation speed control means 46 Compressor control means 47 Freezing temperature detection means 48 Operation control means

Claims (8)

[Claims] 1. A heat recovery refrigerant circuit in which a compressor, a condenser, a first pressure reducing means, and a heat recovery heat exchanger are sequentially connected, and a compressor, the condenser, a second pressure reducing means, atmospheric heat or solar heat. A natural heat utilization refrigerant circuit in which evaporators for collecting heat are sequentially connected, and the heat recovery refrigerant circuit and the natural heat utilization refrigerant circuit provided at refrigerant inlets of the first pressure reducing means and the second pressure reducing means. Switching means for switching, a hot water supply heat exchanger having a heat exchange relationship with the condenser, a hot water supply circuit including a hot water storage tank for storing hot water of the hot water supply heat exchanger, and a bath having a heat exchange relationship with the heat recovery heat exchanger A bath circuit including a heat exchanger, a bathtub, and a bath pump; a temperature detection unit that detects a water temperature of the bath circuit; and a detection temperature of the temperature detection unit that is reduced to a first set temperature during operation by the heat recovery refrigerant circuit. When I did the bath pon When the switching means is switched to the operation using the natural heat utilizing refrigerant circuit while continuously operating, and when the temperature detected by the temperature detecting means rises to a second set temperature higher than the first set temperature, the switching means is again turned on. Heat pump type bath hot water supply system having operation control means for switching the operation to the operation by the heat recovery refrigerant circuit. 2. A drain means for draining bath water remaining in a bath tub of a bath circuit, a temperature detecting means for detecting a water temperature of the bath circuit, and a temperature detected by the temperature detecting means during operation by a heat recovery refrigerant circuit being set to a first setting. When the temperature decreases, the drainage means is opened to drain the bathtub water, and the switching means is switched to the operation by the natural heat utilizing refrigerant circuit. Thereafter, the temperature detected by the temperature detection means is higher than the first set temperature. 2. A heat pump type hot water supply system according to claim 1, further comprising operation control means for closing said drainage means again when said temperature rises to said second set temperature and switching said switching means to operation by said heat recovery refrigerant circuit. 3. The drainage means provided in the bath circuit on the outlet side of the bath pump, and the drainage means is opened when the temperature detected by the temperature detection means drops to a first set temperature during operation by the heat recovery refrigerant circuit. The bathtub water is drained, and the switching means is switched to the operation using the natural heat utilizing refrigerant circuit. Then, the temperature detected by the temperature detecting means is higher than the first set temperature.
When the temperature has risen to the set temperature, the drain control means is closed again and the operation control means for switching the switching means to the operation by the heat recovery refrigerant circuit, and the temperature detected by the temperature detection means has dropped to the first set temperature. 3. The heat pump type bath hot water supply system according to claim 2, further comprising a pump control unit that receives the fact from the operation control unit and sets the bath pump to a maximum flow rate. 4. The heat pump type bath hot water supply system according to claim 2, wherein the drainage means is provided on an outflow side of the bath heat exchanger. 5. A heat recovery refrigerant circuit in which a compressor, a four-way valve, a condenser, a first pressure reducing means, and a heat recovery heat exchanger are sequentially connected;
A check valve provided in parallel with the compressor, the four-way valve, the heat recovery heat exchanger, the first pressure reducing means, a second pressure reducing means,
A hot water supply circuit comprising a bath heating refrigerant circuit in which an evaporator for collecting atmospheric heat or solar heat is sequentially connected, a hot water supply heat exchanger having a heat exchange relationship with the condenser, and a hot water storage tank for storing hot water of the hot water supply heat exchanger. A bath circuit including a bath heat exchanger having a heat exchange relationship with the heat recovery heat exchanger, a bathtub, and a bath pump; operating means for operating a terminal device that reuses bath water; and a bath with the terminal device. Temperature setting means for setting a water temperature at which water is reused, flow path switching means for switching a flow path returning from the bath heat exchanger outlet to the bathtub and a water flow path flowing out to the terminal equipment, and the bath heat exchanger And a bath temperature detecting means for detecting a water temperature between the flow path switching means and a signal from the operating means to switch the flow path switching means to the water discharge flow path side, and the detected temperature of the bath temperature detecting means is When the temperature is higher than the set temperature of the temperature setter, the four-way valve is switched so as to operate in the heat recovery refrigerant circuit, and when the detected temperature of the bath temperature detecting means is lower than the set temperature of the temperature setting means, A heat pump type bath hot water supply system having operation control means for switching the four-way valve so as to operate with a bath heating refrigerant circuit. 6. A flow rate control means for varying a flow rate of the bath pump, and a flow rate control means for transmitting the bath pump flow rate to the bath flow rate control means so that the temperature detected by the bath temperature detection means and the set temperature of the temperature setting means coincide with each other. 6. A heat pump type hot water supply system according to claim 5, further comprising a pump control means for performing the following. 7. A rotation speed control means for varying the rotation speed of the compressor, and a transmission to the rotation speed control means such that the temperature detected by the bath temperature detection means and the temperature set by the temperature setting means coincide with each other. 6. A heat pump type hot water supply system according to claim 5, further comprising a compressor control means for controlling the number of revolutions of the bath. 8. A freezing temperature detecting means for detecting a water temperature of a bath circuit, and when the detected temperature of the freezing temperature detecting means drops to a predetermined temperature, the four-way valve is switched to a bath heating refrigerant circuit to change the refrigerant discharged from the compressor. The heat pump type hot water supply system according to claim 5, further comprising operation control means for heating the bath water with the heat recovery heat exchanger so as to flow to the heat recovery heat exchanger.