JP2002333208A - Heat pump type hot-water supply system for bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the constitution of a heat pump type hot-water supply system for bath and, at the same time, to improve the reliability of the constitution. SOLUTION: In the heat pump type hot-water supply system for bath, a first pressure reducing means 3 and an evaporator 4 which collects atmospheric heat or solar heat and a second pressure reducing means 6 and a heat recovery type heat exchanger 7 are arranged in parallel with respect to a compressor 1 and a condenser 2. In addition, an operation control means 17 which controls the hot-water supplying operation by means of a heat recovery type refrigerant circuit 8 or natural heat utilizing type refrigerant circuit 5 by blocking the first or second pressure reducing means 3 or 6 is provided. Consequently, the switching between flow passages used for hot water supplying operation utilizing atmospheric heat and for hot-water supplying operation utilizing waste heat recovered from a bathtub can be performed by means of a simple constitution composed only of the pressure reducing means 3 and 6. When the hot-water supplying operation is performed, in addition, the flow rate of the refrigerant can be controlled independently by means of the first pressure reducing means 3 at the time of utilizing the natural heat and by means of the second pressure reducing means 6 at the time of utilizing the waste heat recovered from the bathtub. Therefore, the number of used parts can be reduced and the reliability of the compressor 1, etc., can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Heretofore, as a heat pump system of this kind, there has been a heat pump system described in Japanese Patent Application Laid-Open No. 7-71839. Hereinafter, the related art will be described with reference to the drawings. FIG. 7 is a configuration diagram of a conventional heat pump system. In FIG. 7, 1 is a compressor, 2 is a condenser, 3 is a first decompression means, 4 is an evaporator that collects atmospheric heat, 50a is an on-off valve, and these are sequentially connected to each other to use a natural heat utilizing refrigerant. A circuit 5 is constructed, and a second decompression means 6, a heat recovery heat exchanger 7, and an on-off valve 50b are installed at a position parallel to the evaporator 4 and the on-off valve 50a. 2 are sequentially connected to each other to form a heat recovery refrigerant circuit 8. By switching the on-off valves 50a and 50b, switching between a hot water supply operation using natural heat such as atmospheric heat or the like and a heat recovery hot water supply operation using and recovering bathtub waste heat is performed. For example, during the hot water supply operation using natural heat, the on-off valve 50a is opened while the on-off valve 50b is closed, heat is absorbed from the atmosphere via the evaporator 4, and the water is heated by the condenser 2 and stored in the hot water tank 9. . During the heat recovery hot water supply operation, the on-off valve 50b is opened with the on-off valve 50a closed, and the heat recovery heat exchanger 7 is opened.
The heat is absorbed from the hot water in the bathtub 13 through the, and the water is heated by the condenser 2 and stored in the hot water tank 9.

[0003]

However, in the above-mentioned conventional configuration, the on-off valves 50a and 50b are used for switching the flow path between the natural heat utilizing hot water supply operation and the heat recovery hot water supply operation, and the first and second valves are used for controlling the respective refrigerant flow rates. Are required, and the configuration of the system and its control are complicated.

When the heat recovery hot water supply operation is performed, the high-pressure liquid refrigerant flowing out of the condenser 2 becomes a low-pressure two-phase refrigerant in the first pressure reducing means 3, and further passes through the second pressure reducing means 6 to recover heat. Since the refrigerant flows into the heat exchanger 7, the flow rate of the refrigerant is considerably reduced, a predetermined refrigerant flow rate cannot be obtained, and the refrigerant gas sucked into the compressor 1 becomes a high-temperature superheated gas, and the reliability of the compressor 1 is ensured. Will be an issue.

[0005] Further, since the amount of heat taken by the heat recovery heat exchanger 7 decreases due to a decrease in the flow rate of the refrigerant, high efficiency cannot be obtained. To prevent this, the first and second pressure reducing means 3
In the cases of (6) and (6), those having a very large flow control range are essential. In this case, the temperature of the hot water flowing into the heat recovery heat exchanger 7 is higher than that of the atmosphere, so that the low pressure of the compressor 1 rises considerably, and the condenser 2 becomes larger with an increase in the amount of heat taken. Had.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. In addition to reducing the number of components by simplifying the configuration, the present invention realizes improved reliability of a compressor and the like and higher efficiency in heat recovery hot water supply operation. It is an object to provide a heat pump type bath hot water supply system.

[0007]

In order to solve the above-mentioned conventional problems, a heat pump type bath hot water supply system according to the present invention collects first decompression means and atmospheric heat or solar heat for a compressor and a condenser. A heating evaporator, a second decompression unit and a heat recovery heat exchanger are arranged in parallel, and further, the first decompression unit or the second decompression unit is closed, and the heat recovery refrigerant circuit or Operation control means for performing a hot water supply operation by the natural heat utilizing refrigerant circuit.

[0008] This makes it possible to switch the flow path in each of the hot water supply operations of natural heat utilization and bathtub waste heat recovery with a simple configuration using only the first and second decompression means, and to change the refrigerant flow rate during the hot water supply operation. The control can be performed independently by the first pressure reducing means in the case of utilizing natural heat, and by the second pressure reducing means in the case of utilizing bathtub waste heat recovery.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 comprises a natural heat utilization refrigerant circuit in which a compressor, a condenser, a first decompression means, an evaporator for collecting atmospheric heat or solar heat are connected in sequence,
A heat recovery refrigerant circuit in which the compressor, the condenser, the second pressure reduction means and the heat recovery heat exchanger provided in parallel with the first pressure reduction means and the evaporator are sequentially connected, a hot water tank, a circulation pump, A hot water supply circuit in which a hot water supply heat exchanger having a heat exchange relationship with the condenser is sequentially connected, a bath circuit, a bath pump, a bath circuit in which a bath heat exchanger having a heat exchange relationship with the heat recovery heat exchanger is sequentially connected, A heat pump type bath hot water supply system comprising: an operation control means for performing a closing operation of the first pressure reducing means or the second pressure reducing means and performing a hot water supply operation by the heat recovery refrigerant circuit or the natural heat utilization refrigerant circuit. .

[0010] This makes it possible to switch the flow path for each of the hot water supply operations of natural heat utilization and bathtub waste heat recovery with a simple configuration using only the first and second decompression means. Control is simplified. Further, the refrigerant flow rate control during the hot water supply operation can be independently performed by the first pressure reducing means in the case of utilizing natural heat and by the second pressure reducing means in the case of utilizing bathtub waste heat. Therefore, when performing the heat recovery hot water supply operation, the high-pressure liquid refrigerant flowing out of the condenser flows into the heat recovery heat exchanger only through the second pressure reducing means, and the compressor of the compressor due to a decrease in the refrigerant flow rate. This prevents high-temperature superheated gasification of the intake refrigerant gas and a decrease in efficiency due to insufficient heat collection in the heat recovery heat exchanger, thereby improving the reliability of compressors and the like and realizing higher efficiency during heat recovery and hot water supply operation. it can.

[0011] The invention described in claim 2 is particularly advantageous in claim 1.
In addition to the configuration described in the above, the apparatus further comprises a remaining hot water detection means for detecting the remaining hot water in the bathtub, and the operation control means closes the first pressure reducing means only when the remaining hot water detection means detects the remaining hot water in the bathtub. The operation is to perform the hot water supply operation by the heat recovery refrigerant circuit, and a decrease in the hot water supply capacity due to the idle rotation of the bath pump and a decrease in heat absorption to the heat recovery heat exchanger when there is no remaining hot water in the bathtub is prevented, High reliability of the system can be achieved.

[0012] The invention described in claim 3 is particularly advantageous in claim 1.
In addition to the configuration described in any one of (1) to (2) above, a bath temperature detecting means for detecting a water temperature of a bath circuit is provided, and the operation control means performs the first pressure reduction only when the detected temperature of the bath temperature detecting means is higher than a predetermined set value. The hot water supply operation is performed by the heat recovery refrigerant circuit by performing the closing operation of the means. Even when the temperature of the remaining hot water in the bathtub is extremely low, the freezing of the bath circuit is prevented, and the reliability of the system can be further improved.

[0013] The invention described in claim 4 is particularly advantageous in claim 1.
In addition to the configuration described in any one of (1) to (3) above, the apparatus further includes a bath temperature detecting unit for detecting a water temperature of a bath circuit, and an outside air temperature detecting unit for detecting an outside air temperature, and the detected temperatures of the bath temperature detecting unit and the outside air temperature detecting unit. Only when the difference is larger than the predetermined set value, the operation control means performs the closing operation of the first pressure reducing means,
The hot water supply operation is performed by the heat recovery refrigerant circuit, and the hot water supply operation that uses natural heat or bath tub waste heat recovery with higher efficiency can be selected with a simple configuration, and the system can be made more efficient.

The invention described in claim 5 is particularly advantageous in claim 3
In the configurations described in Nos. 1 to 4, the water temperature of the bath circuit is detected by the bath temperature detection means after the bath pump is operated, and the temperature of the remaining hot water in the bathtub is accurately determined regardless of conditions such as heat radiation of the bath circuit. Since the detection can be performed well, the reliability of the system can be improved.

[0015] The invention described in claim 6 is particularly advantageous in claim 1.
In addition to the configuration described in any one of Items 1 to 5, a heat recovery hot water supply operation switch that is operated by a user to output a heat recovery hot water supply operation command signal is provided, and the operation control unit performs the first heat recovery hot water supply operation command signal only when there is the heat recovery hot water supply operation command signal. Perform the closing operation of the decompression means,
The hot water supply operation is performed by the heat recovery refrigerant circuit, and the temperature of the remaining hot water generated during the bath tub waste heat recovery hot water supply operation can be reduced by the user, and unexpected cooling of the bath tub can be prevented.

The invention described in claim 7 is particularly advantageous in claim 1.
In addition to the configuration described in any one of Items 1 to 6, a timer for measuring time is provided, and the operation control unit performs the closing operation of the first decompression unit only when the measured time of the timer is a late-night time zone of the hourly power rate system. And the hot water supply operation is performed by the heat recovery refrigerant circuit. The heat recovery hot water supply operation is limited to the late night hours when the electricity rate is low, and the running cost associated with the hot water supply operation can be reduced.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a configuration diagram of a heat pump type bath hot water supply system in Embodiment 1 of the present invention. In FIG. 1, 1 is a compressor, 2 is a condenser,
Reference numeral 3 denotes a first decompression means, and reference numeral 4 denotes an evaporator for collecting atmospheric heat or solar heat. Further, a second decompression means 6 and a heat recovery heat exchanger 7 are installed at a position parallel to the first decompression means 3 and the evaporator 4, and similarly connected to the compressor 1 and the condenser 2 in order to heat the heat. The recovery refrigerant circuit 8 is configured. Also,
9 is a hot water storage tank, 10 is a circulation pump, 11 is a hot water supply heat exchanger having a heat exchange relationship with the condenser 2, and these are sequentially connected to form a hot water supply circuit 12. 13 is a bathtub, 14
Is a bath pump, 15 is a bath heat exchanger having a heat exchange relationship with the heat recovery heat exchanger 7, and these are sequentially connected to form a bath circuit 16. Further, reference numeral 17 denotes an operation control means for closing the first pressure reducing means 3 or the second pressure reducing means 6 and switching the hot water supply operation by the heat recovery refrigerant circuit 8 or the natural heat utilization refrigerant circuit 5. is there. Here, the first and second decompression means 3 and 6 are, for example, electronically controlled needle valves, which can control the flow rate of the refrigerant and close the flow path.

The operation of the heat pump type hot water supply system configured as described above will be described below. First, in a hot water supply operation for bathtub waste heat recovery, a high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the condenser 2. On the other hand, the water in the hot water storage tank 9 flows into the hot water supply heat exchanger 11 by the circulation pump 10, where it is heated by the heat of condensation of the refrigerant and flows into the hot water storage tank 9. The refrigerant condensed and liquefied in the condenser 2 is decompressed by the second decompression means 6 and flows into the heat recovery heat exchanger 7. On the other hand, the remaining hot water in the bathtub 13 flows into the bath heat exchanger 15 by the bath pump 14, where the refrigerant flowing through the heat recovery heat exchanger 7 is heated and vaporized. At this time, the operation control means 17 performs a closing operation of the first pressure reducing means 3,
The hot water supply operation by the heat recovery refrigerant circuit 8 alone is enabled.

Similarly, in a hot water supply operation using natural heat,
The high-temperature and high-pressure gas refrigerant discharged from the compressor 1 flows into the condenser 2. On the other hand, the water in the hot water storage tank 9 flows into the hot water supply heat exchanger 11 by the circulation pump 10, where it is heated by the heat of condensation of the refrigerant and flows into the hot water storage tank 9. The refrigerant condensed and liquefied in the condenser 2 is decompressed by the first decompression means 3 and is evaporated.
Flows into. The evaporator 4 collects atmospheric heat or solar heat by a blowing fan, a heat collecting panel, or the like.
The heat causes the refrigerant flowing inside the evaporator 7 to evaporate and gasify. At this time, the operation control means 17 performs the closing operation of the second pressure reducing means 6 to enable the hot water supply operation by the natural heat utilizing refrigerant circuit 5 alone.

Therefore, the flow path switching for each hot water supply operation for utilizing natural heat and for recovering waste heat from the bathtub can be performed with a simple configuration using only the first and second pressure reducing means 3 and 6, thereby reducing the number of parts. And simplification of system control. In addition, the refrigerant flow rate control during the hot water supply operation can be independently performed by the first pressure reducing means 3 in the case of utilizing natural heat and by the second pressure reducing means 6 in the case of utilizing bathtub waste heat recovery. Therefore, when performing the heat recovery hot water supply operation, the high-pressure liquid refrigerant flowing out of the condenser 2 flows into the heat recovery heat exchanger 7 through only the second decompression means 6, and the refrigerant flow is reduced. This prevents high-temperature superheat gasification of the refrigerant gas sucked into the compressor 1 and a decrease in efficiency due to insufficient heat collection in the heat recovery heat exchanger 7, thereby improving the reliability of the compressor 1 and the like and increasing the efficiency during the heat recovery hot water supply operation. Can be realized.

When the flow path is switched to the natural hot water supply operation during the bathtub waste heat recovery hot water supply operation, the opening operation of the first pressure reduction means 3 is performed prior to the closing operation of the second pressure reduction means 6. Is performed, the refrigerant in the refrigerant circuit flows without stagnation, so that an excessive increase in pressure on the discharge side of the compressor 1 is prevented, and the reliability of the compressor 1 and the system can be secured. The same applies to the case of switching the flow path to the bath tub waste heat recovery hot water supply operation during the natural heat utilization hot water supply operation.

(Embodiment 2) FIG. 2 shows a configuration diagram of a heat pump type bath hot water supply system in Embodiment 2 of the present invention. The present invention particularly includes, in addition to the configuration described in the first embodiment, remaining hot water detection means 18 for detecting remaining hot water in bathtub 13, and when remaining hot water in bathtub 13 is detected by remaining hot water detection means 18. Only the operation control means 17 performs the closing operation of the first pressure reducing means 3 and performs the hot water supply operation by the heat recovery refrigerant circuit 8. As the remaining hot water detecting means 18, for example, a flow switch for performing an on / off operation depending on the presence or absence of a water flow in the bath circuit 16, a flow meter for measuring a water flow rate, a water level sensor for detecting a water level of the bathtub 13, and the like are provided. Any device that detects the presence or absence of hot water may be used.

When performing the bathtub waste heat recovery hot water supply operation, the bathtub 1
If there is no remaining hot water in 3, durability deterioration due to idling of the bath pump 14 and a decrease in hot water supply capacity due to a decrease in heat absorption to the heat recovery heat exchanger 7 occur. It is assumed that, for example, the remaining hot water leaks from a drain port (not shown) at the bottom of the bathtub 13 during the heat recovery hot water supply operation, and the remaining hot water disappears. In the present embodiment, the hot water supply operation by the heat recovery refrigerant circuit 8 is performed only when the remaining hot water in the bathtub 13 is detected by the remaining hot water detecting means 18, and the system can be highly reliable. Further, when the remaining hot water in the bathtub 13 is not detected by the remaining hot water detecting means 18, the closing operation of the second pressure reducing means 6 is performed, and the hot water supply operation by the natural heat utilizing refrigerant circuit 5 in which the flow rate is controlled by the first pressure reducing means 3. Can be easily performed. In this way, the hot water supply operation can be performed without interruption, and the performance of the system can be improved.

(Embodiment 3) FIG. 3 shows a configuration diagram of a heat pump type bath hot water supply system in Embodiment 3 of the present invention. The present invention particularly includes, in addition to the configurations described in the first and second embodiments, a bath temperature detecting unit 19 that detects a water temperature of the bath circuit 8, and the detected temperature of the bath temperature detecting unit 19 is higher than a predetermined set value. Only at this time, the operation control means 17 performs the closing operation of the first pressure reducing means 3 and performs the hot water supply operation by the heat recovery refrigerant circuit 8. Bath temperature detecting means 19
For example, a device in which a thermistor or the like is inserted into a bath circuit 16 at the entrance or exit of the bath heat exchanger 15 is mentioned.

When the bathtub waste heat recovery hot water supply operation is performed, the remaining hot water flowing through the bath circuit 16 is absorbed by the heat recovery heat exchanger 7 in the bath heat exchanger 15 and its temperature decreases. Bathtub 1
If the temperature of the remaining hot water of 3 is extremely low, the remaining hot water in the bath heat exchanger 15 may freeze and expand, and the bath heat exchanger 15 may be damaged. In the present embodiment, the hot water supply operation by the heat recovery refrigerant circuit 8 is performed only when the detected temperature of the bath temperature detecting means 19 is higher than a predetermined set value, and the reliability of the system can be further improved.

The above-mentioned predetermined set value is determined by the compressor 1
From the capacity of the heat recovery heat exchanger 7 and the bath heat exchanger 15 and the transfer capacity of the bath pump 14, the temperature may be set to an arbitrary temperature (for example, 5 ° C.) above 0 ° C. at which water freezes.

When the temperature detected by the bath temperature detecting means 19 falls below a predetermined set value, the closing operation of the second pressure reducing means 6 is carried out to stop the hot water supply operation by the heat recovery refrigerant circuit 8 and the first It is also possible to easily switch to the hot water supply operation by the natural heat utilizing refrigerant circuit 5 for controlling the flow rate by the pressure reducing means 3. In this way, the hot water supply operation can be performed without interruption, and the performance of the system can be improved.

(Embodiment 4) FIG. 4 shows a configuration diagram of a heat pump type bath hot water supply system in Embodiment 4 of the present invention. The present invention particularly includes, in addition to the configurations described in the first to third embodiments, a bath temperature detecting unit 19 that detects a water temperature of the bath circuit 8 and an outside air temperature detecting unit 20 that detects an outside air temperature. Detecting means 19 and outside air temperature detecting means 20
Only when the difference between the detected temperatures is larger than a predetermined set value,
The operation control means 17 performs the closing operation of the first pressure reducing means 3 and performs the hot water supply operation by the heat recovery refrigerant circuit 8. As the outside air temperature detecting means 20, for example, a device in which a thermistor is installed in the vicinity of a blower fan that collects atmospheric heat into the evaporator 4 or a heat collecting panel that collects solar heat into the evaporator 4 can be used.

When the hot water supply operation is performed by the system as shown in Embodiment 1, from the viewpoint of energy saving, either the natural heat utilization or the bathtub waste heat recovery, whichever is more efficient, is selected to improve the efficiency of the system. You need to drive economically. For example, the temperature of the remaining hot water in the bathtub 13 is generally higher than the outside air temperature in many cases, and the efficiency is better when the hot water supply operation is performed by the heat recovery refrigerant circuit 8. However, when the temperature of the remaining hot water drops due to heat radiation or the like and falls below the outside air temperature, it is not always efficient to perform the hot water supply operation by the heat recovery refrigerant circuit 8. In the present embodiment, the bath temperature detecting means 19
The hot water supply operation by the heat recovery refrigerant circuit 8 is performed only when the difference between the detected temperature of the outside air temperature detecting means 20 and the detected temperature of the outside air temperature detecting means 20 is larger than a predetermined set value. Hot water supply operation can be selected, and the system can be made more efficient.

The above-mentioned predetermined set values are determined by the efficiency of the evaporator 4, the blower fan, the heat collecting panel, etc., which determine the efficiency of the hot water supply operation using natural heat, and the heat recovery heat exchange which determines the efficiency of the bathtub waste heat recovery hot water supply operation. The temperature may be set to an arbitrary value based on the capacity of the heater 7 and the bath heat exchanger 15 and the transfer capacity of the bath pump 14.

When the difference between the detected temperatures of the bath temperature detecting means 19 and the outside air temperature detecting means 20 falls below a predetermined value, the closing operation of the second pressure reducing means 6 is performed to supply hot water by the heat recovery refrigerant circuit 8. It is also possible to easily stop the operation and switch to the hot water supply operation by the natural heat utilizing refrigerant circuit 5 in which the flow rate is controlled by the first pressure reducing means 3. In this way, the hot water supply operation can be performed without interruption, and the performance of the system can be improved.

(Embodiment 5) In Embodiment 5 of the present invention,
In the configuration described in the third and fourth embodiments, after the bath pump 14 is operated, the bath circuit 8
This is to detect the temperature of the water. If the water temperature of the bath circuit 8 is left, for example, in the winter season, the water temperature drops significantly due to heat radiation. It is the temperature of the remaining hot water in the bathtub 13 that determines the efficiency of the bathtub waste heat recovery hot water supply operation. In the present embodiment, the bathtub 13 is circulated beforehand by the bath pump 14 to circulate the remaining hot water. The remaining hot water temperature can be detected with high accuracy, and the system can be highly reliable.

(Embodiment 6) FIG. 5 shows a configuration diagram of a heat pump type bath hot water supply system in Embodiment 6 of the present invention. The present invention particularly includes, in addition to the configuration described in the first to fifth embodiments, a heat recovery hot water supply operation switch 21 that is operated by a user and outputs a heat recovery hot water supply operation command signal. Only when there is a signal, the operation control means 17 performs the closing operation of the first pressure reducing means 3 and performs the hot water supply operation by the heat recovery refrigerant circuit 8.

A hot water supply system of the hot water storage type like this system generally performs the hot water supply operation automatically because the hot water supply operation time required to secure a sufficient amount of hot water storage is long. However, when the bathtub waste heat recovery hot water supply operation is automated, the remaining hot water temperature in the bathtub 13 decreases, so that a desired hot water temperature may not be obtained during bathing. In this embodiment, since only the user operates the heat recovery hot water supply operation switch 21, that is, the hot water supply operation by the heat recovery refrigerant circuit 8 is performed by the user, the unexpected hot water cooling of the bathtub 13 is prevented. it can.

(Embodiment 7) FIG. 6 shows a configuration diagram of a heat pump type bath hot water supply system in Embodiment 7 of the present invention. The present invention particularly includes a timer 22 for measuring the time in addition to the configuration described in the first to sixth embodiments. The operation control is performed only when the time measured by the timer 22 is the midnight time zone of the hourly power rate system. Means 17 is the first decompression means 3
And a hot water supply operation by the heat recovery refrigerant circuit 8 is performed.

According to this, the bathtub waste heat recovery hot water supply operation is limited to the late night hours when the electricity rate is low, and the running cost associated with the hot water supply operation can be reduced.

[0038]

As described above, according to the first to seventh aspects of the present invention, the number of parts can be reduced by simplifying the structure, the reliability of the compressor and the like can be improved, and the waste heat from the bathtub can be recovered. It is possible to provide a heat pump type bath hot water supply system that achieves high efficiency during operation.

[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 sixth embodiment of the present invention.

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

FIG. 7 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 Evaporator 5 Natural heat utilization refrigerant circuit 6 Second decompression means 7 Heat recovery heat exchanger 8 Heat recovery refrigerant circuit 9 Hot water storage tank 10 Circulation pump 11 Hot water supply heat exchanger 12 Hot water supply circuit 13 bathtub 14 bath pump 15 bath heat exchanger 16 bath circuit 17 operation control means 18 remaining hot water detection means 19 bath temperature detection means 20 outside air temperature detection means 21 heat recovery hot water supply operation switch 22 timer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takeshi Watanabe 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (7)

[Claims] 1. A refrigerant circuit utilizing natural heat in which a compressor, a condenser, a first decompression means, an evaporator for collecting atmospheric heat or solar heat are connected in sequence, the compressor, the condenser, and the first refrigerant circuit.
A heat recovery refrigerant circuit in which a pressure reducing means and a second pressure reducing means and a heat recovery heat exchanger provided in parallel with the evaporator are sequentially connected, a hot water tank, a circulation pump, and hot water supply heat having a heat exchange relationship with the condenser. A hot water supply circuit with a series of connected exchangers, a bathtub,
A bath circuit in which a bath pump, a bath heat exchanger having a heat exchange relationship with the heat recovery heat exchanger is sequentially connected, and a closing operation of the first decompression unit or the second decompression unit is performed, and the heat recovery refrigerant is performed. A heat pump type bath hot water supply system comprising: a circuit or operation control means for performing a hot water supply operation using the natural heat utilizing refrigerant circuit. 2. An apparatus for detecting remaining hot water in a bathtub, wherein the operation control means performs a closing operation of the first pressure reducing means only when the remaining hot water in the bathtub is detected by the remaining hot water detecting means. The heat pump type bath hot water supply system according to claim 1, wherein a hot water supply operation is performed by a heat recovery refrigerant circuit. 3. A bath temperature detecting means for detecting a water temperature of a bath circuit, wherein the operation control means performs a closing operation of the first pressure reducing means only when a detected temperature of the bath temperature detecting means is higher than a predetermined set value. The heat pump type bath hot water supply system according to claim 1, wherein the hot water supply operation is performed by a heat recovery refrigerant circuit. 4. A bath temperature detecting means for detecting a water temperature of a bath circuit, and an outside air temperature detecting means for detecting an outside air temperature,
Only when the difference between the detected temperatures of the bath temperature detecting means and the outside air temperature detecting means is larger than a predetermined set value, the operation control means performs the closing operation of the first pressure reducing means, and performs the hot water supply operation by the heat recovery refrigerant circuit. The heat pump type hot water supply system according to any one of claims 1 to 3. 5. The heat pump type hot water supply system according to claim 3, wherein a water temperature of a bath circuit is detected by a bath temperature detecting means after the bath pump is operated. 6. A heat recovery hot water supply operation switch that is operated by a user and outputs a heat recovery hot water supply operation command signal,
The heat pump according to any one of claims 1 to 5, wherein only when the heat recovery hot water supply operation command signal is present, the operation control means performs the closing operation of the first pressure reducing means and performs the hot water supply operation using the heat recovery refrigerant circuit. Bath water supply system. 7. A timer for measuring time, wherein the operation control means performs a closing operation of the first pressure reducing means only when the measured time of the timer is a midnight time zone of the hourly electric power rate system to recover heat. The heat pump type bath hot water supply system according to any one of claims 1 to 6, wherein the hot water supply operation is performed by a refrigerant circuit.