JP2001272106A - Bath hot water heat recovery cold storage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the improvement of recovered heat amount from remaining hot water in a bathtub and simultaneously cold storage utilizing the bathtub. SOLUTION: There are provided flow passage changeover means and a bypass flow passage on a bath hot water heat recovery circuit composed of a bathtub, a bath circulation passage, a bath pump, and a bath heat exchanger. When bath hot water heat to a lower portion of a bathtub is collected upon operation by the heat recovery means, the flow passage changeover means is simultaneously opened to the bath heat exchanger side and the bypass flow passage side, and stirring of bath hot water in the bathtub at a flow rate of the bath hot water increased by provision of the bypass and temperature layers in the bathtub are eliminated to make bath hot water temperature uniform. Further, the bypass circuit is closed, and heat from the bath hot water is collected continuously repeatedly, whereby an improvement of the recovered heat amount of bath hot water heat and cold storage utilizing the bathtub are ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water recovery and cold storage system utilizing the remaining hot water of a bathtub.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram of a conventional bath hot water recovery system disclosed in Japanese Patent Laid-Open No. 11-337168. In the hot water supply operation using the waste heat of the bathtub in FIG. 12, when the circulating water temperature becomes equal to or lower than a predetermined temperature, the bath water level is lowered while draining the bath water, heat is recovered from the circulating water, and the hot water storage side on the heat radiation load side Supply hot water to the tank.

[0003]

However, in the conventional bath water heat recovery system, even if the waste heat in the bath tub can be efficiently recovered, the chilled water generated at the same time is discarded. There is a problem that can not be done.

[0004] In the ordinary circulation heat recovery, a density difference occurs between the bath water and the low-temperature water returned from the heat recovery circulation in the bathtub, and the returned low-temperature water stays in the lower part of the bathtub. The phenomenon (temperature stratification) that the remaining bath water stays in the upper part of the bath tub occurs.

[0005] Therefore, only the bath water near the bathtub connection port connecting the bathtub and the waste heat heat exchanger is used for waste heat, so that there is a problem that the amount of hot water that can be used for waste heat is reduced.

In addition, since the amount of hot water is small, the temperature of the bed area in which waste heat can be recovered is reduced in a short time after the heat collecting operation is started, and heat is collected from the reduced bath water, resulting in low operating efficiency. Problem.

[0007] It is an object of the present invention to secure the cold heat of the hot and cold water after heat recovery without installing a dedicated cold storage tank.

[0008] Another object of the present invention is to efficiently and efficiently recover heat from bath water.

[0009]

Means for Solving the Problems and Action / Effect To solve the above problems, the present invention provides a heat exchanger for recovering the heat of bath water and performing a cooling operation, and a bath having a heat exchange relationship with the heat exchanger. A bath circuit composed of a heat exchanger, a bath water circulation pump and a bathtub, a bath water circulation bypass passage branched from an outlet of the bath water circulation pump and connected to a return passage returning to the bathtub, Is provided in a bath circuit between the outlet of the bath water circulation pump and the bathtub, and the flow path switching means provides a flow path only for a bath heat exchanger, a bypass flow path and a flow path to a bath heat exchanger. This is a bath water heat recovery and cold storage system characterized by switching to a flow path in which the flow paths are parallel to each other. With the above configuration, the heat of the bath water sent from the bathtub is collected by the heat recovery heat exchanger. . In addition, while continuing the operation, the flow path switching means is switched in parallel with the bypass flow path and the bath heat exchanger to eliminate the pressure loss caused by the bath heat exchanger and return to the bathtub to increase the flow rate of the bath water so that the inside of the bathtub by the water flow is increased. Stir the bath water.

As a result, the temperature of the bath water in the bath tub is effectively eliminated, the temperature in the bath tub becomes uniform, and the high-temperature heat-collectable bath water flows into the bath heat exchanger again. Therefore, since the waste heat from the bath water in the entire bath tub is completely collected, the amount of heat recovered from the bath tub is significantly improved, and an efficient heat collecting operation can be realized. Further, the bath water after the heat recovery can be entirely recovered in the bathtub as cold storage water.

A heat pump circuit in which a compressor, a condenser, a decompression means, and a heat recovery heat exchanger are sequentially connected, in addition to the above configuration, as in the second aspect of the invention, and a heat exchange relationship with the condenser. A bath circuit composed of a bath heat exchanger having a heat exchange relationship with a heat recovery heat exchanger, a bath water circulation pump and a bath tub, and a return flow branched from an outlet of the bath water circulation pump and returned to the bath tub. A hot water circulation bypass flow path connected to the road and a flow path switching means for the bypass flow path are provided in a bath circuit between an outlet of the hot water circulation pump and the bathtub, and the flow path switching means is operated in a bypass flow path during operation by the heat pump circuit. By switching between the bath heat exchanger in parallel and the bath heat exchanger alone, while collecting the bath water in the bath heat exchanger, the low-temperature bath accumulated in the lower part of the bathtub by collecting heat in the single flow path Stir hot water and bathtub While a uniform hot water temperature continues to heat collecting operation.

According to this embodiment, the heat of the bath water sent from the bathtub is collected by the heat pump circuit.
The heat of condensation of the refrigerant is used in the radiation load section. For example, the heat-dissipation load unit is used as a heat-dissipation unit for heating indoor air and a heat-dissipation unit for warming water. On the other hand, the bath water whose temperature has been reduced by the heat collected by the bath heat exchanger returns to the bath tub again, and stays below the connection port flowing into the bath tub due to the density difference with the non-circulating bath water. Then, the bath water at the lower portion 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 bath water near the bottom of the bathtub connection port is always used for heat collection, so that the temperature difference between the bathtub upper and lower bathtubs becomes remarkable.

[0013] Therefore, while operating, the flow path switching means is opened to the bypass flow path side to eliminate the pressure loss due to the bath heat exchanger, and is returned to the bath tub to increase the flow rate of the bath water to stir the bath water in the bath tub by the water flow. I do. As a result, the temperature of the bath water in the bath tub is eliminated, the temperature in the bath tub becomes uniform, and the high-temperature heat-collectable bath water flows into the bath heat exchanger again. Therefore, since the waste heat from the bathtub in the entire bathtub is collected without waste, the amount of heat recovered from the bathtub bathwater is significantly improved and an efficient heat collection operation can be realized.
At the same time, all the bath water after heat recovery can be recovered in the bathtub as cold storage water. Further, since the heat of the bath water is recovered without stopping the operation of the heat pump, a stable heat collecting operation can be performed.

Further, in addition to the above configuration, the temperature detecting means for detecting the water temperature between the bathtub return-side bypass connection part and the bathtub connection port, and the above-mentioned temperature during operation by the heat pump circuit. When the temperature detected by the detecting means drops to the first set temperature, the flow path switching means is opened in parallel with the bypass flow path and the bath heat exchanger, and thereafter the detected temperature is higher than the first set temperature at the second set temperature Operation control means for switching the flow path switching means to the bath heat exchanger alone when the temperature has risen up to a temperature of the bath heat exchanger. When the temperature of the hot water falls to the first set temperature and the operating efficiency is reduced or reaches a temperature at which there is a risk of freezing, the flow path switching means is opened in parallel with the bypass flow path and the bath heat exchanger to perform bath heat exchange. Depends on the vessel The pressure loss is eliminated, the flow rate of the bath water is increased, and the bath water in the bath tub is stirred by the water flow. Thereby, when the bath water in the bath tub is de-stratified and the temperature in the bath tub becomes uniform and reaches the second set temperature, the flow path switching means is switched again to the bath heat exchanger alone, and the hot bath water is removed. Continue the heat collection operation.

Therefore, a simple temperature detecting means is provided closer to the bath heat exchanger between the bathtub return side bypass connection portion and the bathtub connection port, so that the temperature of the cooled bath water coming out of the bath heat exchanger can be reduced. Is directly detected and the flow path switching means is switched, so that the flow path in the bath heat exchanger does not freeze and high reliability can be obtained.

Further, in addition to the above configuration, the temperature detecting means for detecting the water temperature of the bath circuit, and the flow path switching means at the start of operation by the heat pump circuit may include a bypass flow path and bath heat. When the temperature detected by the temperature detecting means is lowered by a predetermined temperature width from the detected hot water temperature immediately after switching to the bath heat exchanger alone, the flow path switching means is switched to the bath heat exchanger alone. Operation control means for switching the bypass flow path and the bath heat exchanger in parallel from each other. It switches to a bath heat exchanger parallel, detects the circulating water temperature at which the temperature detecting means is located, and sets the detected water temperature as an initial value. Then, the bypass flow path is closed again, the circulating water is passed through the bath heat exchanger, and the temperature of the circulating water decreases with the operation of the heat pump. It switches to the bath heat exchanger in parallel and performs circulation operation for a predetermined time. Then, the detected water temperature of the circulating water temperature at which the temperature detection means is located when the bath agitating is completed and the switching from the bypass flow path to the bath heat exchanger is performed again is newly set as the initial value.

Therefore, the temperature at which the flow path switching means is switched to the bath heat exchanger is not defined as the absolute temperature, and the detected water temperature of the temperature detecting means when the flow path switching means is switched to the bath heat exchanger is set to the initial bath water temperature. In order to switch to the bypass channel side assuming the temperature, the collection and agitation are effectively repeated even when the bath water temperature in the bath tub has been lowered for a long time after the end of bathing,
Bath water heat can be efficiently recovered. That is, regardless of the initial bath water temperature, the collection and stirring are effectively repeated to realize an efficient collection operation.

Further, in addition to the above configuration, the first temperature detecting means for detecting the water temperature between the bath water circulation pump and the flow path switching means, and the detection of the first temperature detecting means. Storage means for storing the temperature, a bath water circulation pump provided between the bath circuit outlet and the bath circuit connection of the flow path switching means,
Second temperature detecting means for detecting a bath heat exchanger outlet water temperature,
When the temperature detected by the second temperature detecting means drops to a set temperature during operation by the heat pump circuit, the detected temperature of the first temperature detecting means is stored, and the flow path switching means is connected to a bath heat exchanger and a bypass flow path in parallel. Operating means for controlling the flow rate of the bath hot water circulation pump so that the difference between the detected temperature of the first temperature detecting means and the stored detected temperature is higher than a preset temperature difference. In operation in which recovered heat is used in the heat-dissipating load section while collecting heat, the temperature of water flowing out of the bath heat exchanger drops below a preset temperature as the operation progresses, resulting in poor operating efficiency or heat pump operation. When the liquid in the compressor of the circuit is compressed or the temperature of the bath heat exchanger is likely to freeze, the flow path switching means is switched to the bypass flow path and the bath heat exchanger in parallel. Te, a uniform quickly eliminated by bathwater temperature strongly stirring the temperature stratification in the bath hot water bath controlled to the bathtub to operate the flow rate of the bath circulation pump at maximum flow rate. Therefore, the heat recovery of the bath water can be continued while ensuring reliability such as prevention of freezing of the compressor of the heat pump circuit or the bath circuit.

Further, in addition to the above construction, the flow path switching means is switched between the bypass flow path and the bath heat exchanger at the start of operation by the heat pump circuit, and the bath water circulation pump is operated. After that, an operation control means for operating the compressor with a delay of a predetermined time is provided, and in the operation of utilizing the recovered heat in the radiating load portion while collecting the bath water heat, the operation is performed by bypassing the flow path switching means at the start of operation. And the bath heat exchanger is switched in parallel, and the bath circulation pump is circulated for a predetermined time to stir the bath water in the bathtub. Then, the operation by the heat pump circuit is started. Therefore, the temperature distribution between the upper and lower portions of the bath water in the bathtub is eliminated, and the bath water having a uniform temperature flows into the bath heat exchanger, so that efficient operation can be performed. In particular, when the bath is left for a long time after completion of bathing, the temperature distribution in the upper and lower portions of the bath water is remarkable, so that the effect is remarkable.

Further, in addition to the above-described configuration, a second condenser is provided in parallel with the condenser, and a refrigerant passage for switching the refrigerant passage to the second condenser side. By having the switching means, when the heat flow into the condenser cannot be performed in the bath water heat recovery operation by the heat pump circuit, the cooling water flow path is switched to the second condenser side to continuously cool the bath water. Can be. The heat pump circuit first collects heat in the hot water storage tank, but a time comes when the amount of heat stored in the hot water storage tank becomes full and heat collection becomes impossible. Therefore, by providing the second condenser as a new radiator, by switching the refrigerant flow path to the second condenser side by the refrigerant flow switching means, the heat from the bath water can be continuously recovered. Become.

Further, in addition to the above-mentioned configuration, the temperature detecting means for detecting the inlet water temperature of the hot water supply heat exchanger, and when the temperature detected by the temperature detecting means is higher than a predetermined temperature, It is provided with a refrigerant flow switching means for switching the refrigerant flow to the second condenser side, and in the operation of utilizing the recovered heat in the radiating load portion while collecting the bath water heat, the water temperature at the inlet of the hot water supply heat exchanger is controlled by a heat pump. When the temperature is higher than the temperature that can be raised, the heat of the bath water cannot be recovered due to the limit of the heat pump capacity. Then, when the water temperature at the inlet of the hot water supply heat exchanger becomes higher than a predetermined water temperature, the refrigerant circuit is switched to the second condenser, and the heat collection operation from the bath water can be effectively continued.

According to the ninth aspect of the present invention, in addition to the above-described configuration, the flow path switching means has a switching means for switching between a bath heat exchanger and a bypass flow path in parallel or a bath heat exchanger,
Equipped with means for switching the flow path to the heat load device other than the bypass flow path and the bath water heat recovery circuit, and after collecting the bath water heat, the cold water stored in the bath tub is replaced by the bath heat exchanger and the bath circulation circuit Can be effectively used according to the cooling load requirement.

In addition to the above configuration, the refrigerant temperature detecting means for detecting the refrigerant temperature at the inlet of the heat recovery heat exchanger, and the detected temperature of the refrigerant temperature detecting means may be a predetermined temperature. When the temperature is lowered, stop control means for stopping the operation of the compressor is provided, and in the operation of collecting the bath water heat and utilizing the recovered heat in the heat radiation load section, the bath heat exchanger freezes and the bath water is circulated. When heat cannot be absorbed or when the amount of refrigerant in the heat pump circuit leaks and the amount of refrigerant is small, the temperature of the refrigerant flowing into the heat recovery heat exchanger drops sharply when the heat pump is operated. When the temperature of the refrigerant flowing into the heat recovery heat exchanger drops to a preset temperature, the operation of the compressor and the bath circulation pump is stopped, and the recovery of the bath water heat is completed. Therefore, since the compressor does not perform liquid compression, reliability is improved.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. In the conventional example and the respective embodiments, the same reference numerals are given to components having the same configuration and the same operation, and a part of the description is omitted.

(Embodiment 1) FIG. 1 is a configuration diagram of a bath hot water heat recovery and storage system according to Embodiment 1 of the present invention. In FIG.
The solid arrow indicates the flow direction of the bath water, the broken arrow indicates the physical quantity such as water temperature detected for control and the transmission path of the control signal, and the thick arrow indicates the transfer of heat from the bath to the heat recovery system. .

This bath water heat recovery and cold storage system comprises a bathtub 11
A bath heat recovery circuit configured by connecting a bath pump 17 and a bath heat exchanger 10 through a bath circulation circuit 12;
A flow path switching means 14 for switching the flow path to a bypass flow path 16 that branches off from between the bath pump 17 and the bath heat exchanger 10 and bypasses to the bathtub return side. Further, the bath heat exchanger 10 is connected to the heat recovery means 50 in a manner capable of transferring heat, and cools the bath by receiving heat from the bathtub.

The term "heat recovery means" as used herein means any means capable of quickly collecting heat from bath water, such as a chemical heat pump or a Peltier element.

The operation and operation of the above configuration will be described. At the start of the heat recovery operation from the bath water, the flow path switching means 14 of the flow path of the bath water is switched to the bath heat exchanger 10 side alone operation, time measurement is started, and heat recovery from the bath water is continued. Then, the temperature of the bath water gradually decreases to reach a temperature at which heat transfer in the heat exchanger 10 is impossible. Further, the bath water whose temperature has been reduced by absorbing heat in the bath heat exchanger 10 returns to the bathtub 11 again, and stays below the connection port flowing into the bathtub 11 due to the density difference with the non-circulating bath water. Then, it flows again into the bath heat exchanger 10 and is cooled to form the bathtub 1.
Come back to 1. By repeating this operation, the temperature of the low-temperature bath water below the bathtub connection port is constantly absorbed, so that the temperature difference between the bath water at the top and the bath water at the bottom becomes remarkable. Therefore, after a lapse of a predetermined time from the start of the operation, the operation control means 20 switches the flow path switching means 14 between the bypass flow path 16 and the bath heat exchanger 10 in parallel. Then, the circulating bath water is released from the pressure loss caused by the bath heat exchanger 10, increases the flow rate and the flow velocity, and returns to the bathtub. Then, the low-temperature water layer staying in the lower part of the bathtub and the high-temperature water layer in the upper part are stirred by a water flow. By repeating this, the flow path switching means 14 is switched. The heat recovery operation from the bath water is continued while repeating this cycle.

As a result, the temperature of the bath water in the bath is made uniform, and the flow path switching means 14 is switched to the bath heat exchanger 10 again, so that heat can be collected from the hot bath water. Therefore, the hot water in the lower part of the bathtub is collected first, the hot water in the bathtub is agitated by opening the bypass flow path 16 and the bath heat exchanger 10 in parallel and the temperature is made uniform to continue the heat collection. By closing the bypass circuit and switching to the bath heat exchanger 10 side to continue the heat collection operation, the heat is collected without heating the bath water in the bath tub. And efficient operation can be realized.

Further, the switching of the flow path switching means 14 by the control means 20 is detected by the second temperature detecting means 18 for detecting the temperature of bath water flowing out of the bathtub 11, and when the temperature of the hot water drops to a predetermined temperature, the bypass flow path 16 And the bath heat exchanger 10 is switched in parallel, and then the same effect can be obtained by closing the bypass flow passage 16 after a lapse of a predetermined time.

Referring to FIG. 14, the operation method will be described. During the sole heat recovery operation (S50), the temperature of the effluent from the bathtub is detected by the second temperature detecting means 18 (S51), and a detection signal is transmitted to the operation control means 20, and the operation control means 20 determines that the signal value is a predetermined value. Determine if it is below the temperature. If the second temperature detecting means 18 determines that the water temperature is equal to or lower than the predetermined value, the flow path switching means 14 switches between the bypass flow path and the bath heat exchanger 10 in parallel (S53), and starts the parallel stirring operation (S55). ) And at the same time, start time measurement (S5).
4) After a predetermined time has elapsed, the flow path switching means 14 is switched to the heat recovery independent operation (S57). This cycle is repeated, and the heat in the bathtub is efficiently recovered without heat.

FIG. 11 is a block diagram of a heat pump type bath hot water heat recovery and storage system according to another configuration of the first embodiment of the present invention. In FIG. 11, reference numeral 70 denotes a bypass opening / closing means, which is a means replacing the flow path switching means 14 in FIG.
The other configuration and operation are the same, and thus the description is omitted.

(Embodiment 2) FIG. 2 is a configuration diagram of a heat pump type bath hot water heat recovery and storage system according to Embodiment 2 of the present invention.
In FIG. 2, the solid arrow indicates the flow direction of the bath water,
The dashed line indicates the physical flow such as the coolant flow direction and the water temperature detected for control and the transmission path of the control signal.

The heat pump type hot water recovery and cold storage system has three circuit configurations. One is a closed circuit (heat pump circuit 5) in which the compressor 1, the first condenser 2, the pressure reducing means 3, and the heat recovery heat exchanger 4 are sequentially connected.
In addition, the hot water supply heat exchanger 6 having a heat exchange relationship with the first condenser 2 and condensing the refrigerant, a hot water storage tank 7 for storing hot water heated by the hot water supply heat exchanger 6, and water in the circuit. And a hot water supply pump 9 for circulating water. Furthermore, a bath water heat recovery circuit configured by connecting a bath heat exchanger 10 having a heat exchange relationship with the heat recovery heat exchanger 4, a bath circulation circuit 12, a bathtub 11, and a bath pump 17 is provided.
This bath water heat recovery circuit is provided with a flow path switching means 14 in a bath circuit between a bath pump 17 outlet and a bath heat exchanger 10,
It is possible to switch so as to open the bypass flow path 16 connected to the return flow path side that returns to the bathtub by bypassing in parallel with the bath heat exchanger 10 side flow path. Operation control means 2
0, the flow switching means 14 is switched to the bypass flow path 16 and the bath heat exchanger in parallel at the start of operation by the heat pump circuit 5 to start time measurement, and after a lapse of a predetermined time, the flow switching means 14 is switched to the bath heat exchanger. Switch alone. Then, the time measurement is started again, and after a lapse of a predetermined time, the flow path switching means 14 is switched again to the bypass flow path 16 and the bath heat exchanger in parallel, and the time measurement is started. By repeating this, the flow path switching means is switched.

The operation and operation of the above configuration will be described. This section describes the operation of heating and storing hot water in a hot water storage tank while collecting heat from bath water. The refrigerant discharged from the compressor 1 flows into the first condenser 2, and heats the water sent from the hot water storage tank 7 by the hot water supply pump 9 via the hot water supply heat exchanger 6. The condensed and liquefied refrigerant is depressurized by the decompression means 3 and flows into the heat recovery heat exchanger 4. Then, the refrigerant flowing into the heat recovery heat exchanger absorbs the heat of the bath water via the bath heat exchanger 10 and returns to the compressor 1. While repeating this cycle, the hot water in the bathtub 11 is collected and hot water is stored in the hot water storage tank 7. In addition, bath heat exchanger 10
The bath water whose temperature has been lowered by the heat absorption returns to the bathtub 11 again, and stays below the connection port flowing into the bathtub 11 due to the density difference with the bath water that does not circulate. Then, it flows into the bath heat exchanger 10 again, is cooled, and returns to the bathtub 11. By repeating this operation, the temperature of the low-temperature bath water below the bathtub connection port is constantly absorbed, so that the temperature difference between the bath water at the top and the bath water at the bottom becomes remarkable. Then, after a lapse of a predetermined time from the start of the operation, the control means 20 switches the flow path switching means 14 between the bypass flow path 16 and the bath heat exchanger 10 in parallel. Then, the circulating bath water is released from the pressure loss caused by the bath heat exchanger 10, increases the flow rate and the flow velocity, and returns to the bathtub. Then, the low-temperature water layer staying in the lower part of the bathtub and the high-temperature water layer in the upper part are stirred by a water flow.

Thus, the temperature of the bath water in the bath is made uniform, and the flow path switching means 14 is switched to the bath heat exchanger 10 again, so that heat can be collected from the hot bath water. Therefore, the hot water in the lower part of the bathtub is collected first, the hot water in the bathtub is agitated by opening the bypass flow path 16 and the bath heat exchanger 10 in parallel and the temperature is made uniform to continue the heat collection. By closing the bypass circuit and switching to the bath heat exchanger 10 side to continue the heat collection operation, the heat is collected without heating the bath water in the bath tub. And efficient operation can be realized. Further, since the heat of the bath water is recovered without stopping the operation of the heat pump, the heat recovery operation time can be shortened, and a stable temperature of the heated hot water and a heat pump cycle can be obtained. The operation control method is the same as that in the first embodiment, and thus the description is omitted.

(Embodiment 3) FIG. 3 is a configuration diagram of a heat pump type bath hot water heat recovery and storage system according to Embodiment 3 of the present invention.
In FIG. 3, the solid arrow indicates the flow direction of the bath water when the flow path switching means 14 switches the bypass flow path 16 and the bath heat exchanger 10 in parallel, and the broken line switches to the bath heat exchanger 10 alone. Shows the flow direction of bath water at the time. Further, the first temperature detecting means 19 detects the water temperature between the bathtub return-side bypass connection portion and the bathtub connection port after passing through the bath heat exchanger 10, and transmits a detection signal to the operation control means 20. Further, the operation control means 20 performs the first temperature detection means 1 during the hot-water storage operation of the bathtub 11 using the hot-water bath heat by the heat pump circuit 5.
When the detected temperature of the temperature 9 drops to the first set temperature, the flow path switching means 14 is switched to the bypass flow path 16 and the bath heat exchanger in parallel, and thereafter, the second detected temperature is higher than the first set temperature.
When the temperature has risen to the set temperature, the flow path switching means 14 is switched to the bath heat exchanger 10 alone to continue the operation.

The operation and operation of the above configuration will be described with reference to FIG. In the operation of heating and storing the water in the hot water storage tank 7 while collecting the heat of the bathtub bath water, the water temperature at the outlet side of the bath heat exchanger 10 is detected by the first temperature detection means 19 (S5), and the detection signal is operated and controlled. Means 20
Send to The operation control means 20 determines whether the value detected by the first temperature detection means 19 has dropped to the first set temperature, and if the temperature is lower than the reference value t ₁ , the flow path switching means 14 is switched to the bypass flow path 16. And the bath heat exchanger 10 is opened in parallel (S7), the pressure loss caused by the bath heat exchanger 10 is eliminated, the flow rate of the bath water is increased, and the operation is continued while the bath water in the bath tub is stirred by the water flow (S8). . As a result, the temperature and the stratification of the bath water in the bathtub 11 are eliminated, the temperature in the bathtub becomes uniform, and when the value detected by the first temperature detecting means 19 reaches the second set temperature again (S9), the flow path switching means 1
4 is switched back to the bath heat exchanger 10 alone (S11).
(S12) The heat collecting operation from the high-temperature bath water is continued. Therefore, a simple temperature detecting means is provided closer to the bath heat exchanger 10 between the bathtub return side bypass connection portion and the bathtub connection port, and the temperature of the cooled bath water coming out of the bath heat exchanger 10 is measured. To directly detect and switch the channel switching means,
High reliability can be obtained without the flow path in the bath heat exchanger 10 being frozen.

(Embodiment 4) FIG. 4 is a configuration diagram of a heat pump type bath hot water heat recovery and storage system according to Embodiment 4 of the present invention.
In FIG. 4, the bath circulation circuit 1 is detected by the temperature detecting means 19.
The temperature of the water circulating through 2 is detected, and the detection signal is transmitted to the operation control means 20. Further, the operation control means 20 switches the flow path switching means 14 to the bath heat exchanger 10 alone during the operation by the heat pump circuit 5, and the temperature detected by the temperature detecting means 19 changes from the bypass flow path 16 and the bath heat exchanger 10 parallel to the bath heat exchanger 10. When the detected temperature immediately after the switching to the exchanger 10 alone is lowered by a predetermined temperature width, the flow path switching means 14 is switched to the bath heat exchanger 1.
0 is switched to the bypass flow path 16 and the bath heat exchanger 10 in parallel.

The operation and operation of the above configuration will be described with reference to FIG. In the operation of heating and storing the water in the hot water storage tank 7 while collecting the hot water, at the start of the operation, the flow path switching means 14 is switched to the bypass flow path 16 and the bath heat exchanger 10 in parallel (S13). The operation is performed for a predetermined time (m ₁ ) (S14), and the circulating water temperature at which the temperature detecting means 19 is located is detected, and the detected water temperature is set as an initial value (S15). And, again, the bypass flow path 16
Is closed (S16), the circulating water is passed through the bath heat exchanger 10 alone (S17), and the circulating water temperature decreases as the operation by the heat pump progresses. The water temperature is detected again by the first temperature detection means 19 (S18), and the detection signal is transmitted to the operation control means 20, where it is determined whether or not the temperature has decreased by a predetermined value from the initial value. When the variation is larger than the reference value Δt, the flow path switching means 14 is switched to the bypass flow path 16 and the bath heat exchanger 10 in parallel (S13), and the stirring operation is performed for a predetermined time (S14). Then, the detected water temperature of the circulating water temperature at which the temperature detection means 19 is located when the bath tub stirring is completed and the bath heat exchanger 10 is switched from the bypass flow path 16 to the bath heat exchanger 10 again is newly set as an initial value (S15). Then, when the circulating water temperature decreases over time and decreases by a predetermined temperature from a new initial value, the flow path switching means 14 is switched from the bath heat exchanger 10 alone to the bypass parallel. This cycle is operated repeatedly.

Therefore, the temperature at which the flow path switching means 14 is switched to the bath heat exchanger 10 is not defined as the absolute temperature, and the first temperature detecting means 19 detects when the flow path switching means is switched to the bath heat exchanger 10 side. Since the water temperature is regarded as the initial bath temperature and switched to the bypass flow path 16 side, the collection and agitation are effectively repeated even when the temperature of the bath water in the bath tub has been lowered after a long time since the end of bathing. Hot water can be recovered. That is, regardless of the initial bath water temperature, the collection and stirring are effectively repeated to realize an efficient collection operation.

(Embodiment 5) FIG. 5 is a configuration diagram of a heat pump type bath hot water heat recovery and storage system according to Embodiment 5 of the present invention.
In FIG. 5, the first temperature detecting means 19 detects the water temperature from the bath heat exchanger 10 and outputs the detection signal to the operation control means 2.
Send to 0. Further, the second temperature detecting means 18 is provided between the bath pump 17 and the flow path switching means 14 provided between the bathtub outlet and the flow path switching means 14, detects the temperature of the water flowing out of the bathtub, and outputs a detection signal. Is transmitted to the operation control means 20. Further, the operation control means 20 switches the flow path switching means 14 to the bypass flow path 16 and the bath heat exchanger in parallel when the temperature detected by the second temperature detection means 18 decreases to the set temperature during operation by the heat pump circuit 5, The temperature detected by the first temperature detecting means 19 is stored in a storage means (not shown), and the bath pump 17 is operated at the maximum flow rate so that the water temperature during bypass circulation becomes larger than a preset temperature difference Δt. The temperature difference Δt is calculated by the following equation. Δt = temperature detected by first temperature detecting means 19 after opening of bypass flow path−temperature detected by first temperature detecting means 19 immediately after opening of bypass flow path

The operation and operation of the above configuration will be described. In the operation of heating and storing the water in the hot water storage tank 7 while collecting the hot water, the temperature of the water flowing out of the bath heat exchanger 10 decreases as the operation progresses. Then, the temperature of the bath heat exchanger 10 drops below a preset temperature. Then, when the operation efficiency becomes poor, liquid compression of the compressor 1 of the heat pump circuit 5 occurs, or the temperature of the bath heat exchanger 10 reaches a temperature at which there is a possibility of freezing, the flow path switching means is switched to the bypass flow path 16 and the bath heat. The flow rate of the bath pump 17 is controlled so as to operate at the maximum flow rate by switching to the exchanger 10 in parallel, and the inside of the bathtub is vigorously stirred to quickly eliminate the temperature stratification of the bathwater in the bathtub and make the bath temperature uniform. Therefore, prevention of destruction and stop of the compressor 1 of the heat pump circuit,
Alternatively, the bath circuit can be prevented from freezing, and the heat recovery of the bath water can be continued while ensuring the reliability.

The operation method of this embodiment will be described with reference to the control flowchart of FIG. Start the heat recovery operation,
The temperature t of the effluent from the bathtub by the second temperature detecting means 18
₂ (S21), and the detection signal is sent to the operation control means 2
Send to 0. The operation control means 20 determines whether or not the detected value t ₂ is larger than the reference value t _20. If the detected value t ₂ is larger, the heat recovery alone operation is continued.
4 to switch the flow path (S23).
24), and immediately detect the outlet water temperature of the bath heat exchanger 10 by the first temperature detecting means 19 (S25), and change the value to t.
_{It is} stored as ₁ in a storage unit (not shown) (S26).
Then, the operation is continued while monitoring the outlet water temperature by the first temperature detecting means 19, and when the outlet water temperature rises from the initial value t ₁ to Δt ₁₀ or more, the flow path switching means 14 is moved to the bath heat exchanger 10 side. Switch (S29) and perform the heat recovery alone operation (S29).
30) The second temperature detecting means 18 again proceeds to the step of detecting the temperature of the water flowing out of the bathtub (S21). This cycle is thus repeated.

(Embodiment 6) FIG. 6 is a configuration diagram of a heat pump type bath hot water heat recovery and storage system according to Embodiment 6 of the present invention. In FIG. 6, the operation control means 20 switches the flow path switching means 14 to the bypass flow path 16 and the bath heat exchanger 10 in parallel at the start of the operation by the heat pump circuit 5, and operates the bath pump 17 to delay a predetermined time. The compressor 1 is operated.

The operation and operation of the above configuration will be described with reference to FIG. In the operation of heating the hot water in the hot water storage tank 7 and storing hot water while collecting the hot water, the flow switching means 14 is switched to the bypass flow path 16 and the bath heat exchanger 10 in parallel at the start of the operation (S31), and the bath circulation pump is operated. 17
Is circulated for a predetermined time to stir the bath water in the bathtub (S
32). At the same time, time measurement is started (S33), and after a predetermined time delay, the flow path switching means (14) switches the flow path of the bath water (S34) (S35), and operates the compressor 1 to operate the heat pump circuit 5. Is started (S3
6). Therefore, the temperature distribution between the upper and lower portions of the bath water in the bathtub is eliminated, and the bath water having a uniform temperature is supplied to the bath heat exchanger 10.
The operation can be efficiently performed. In particular, the temperature distribution in the upper and lower portions of the bath water in the bathtub 11 is remarkable when the bath is left for a long time after the bathing, but this remarkable temperature distribution is eliminated.

(Embodiment 7) FIG. 7 is a configuration diagram of a heat pump type bath hot water heat recovery and storage system according to Embodiment 7 of the present invention.
In FIG. 7, the refrigerant flowing through the heat pump circuit 5 can be switched from the first condenser 2 side to the second condenser 21 by the refrigerant flow switching means 22.

The operation and operation of the above configuration will be described. With the progress of the heat collecting operation to the hot water storage tank 7 via the first condenser 2 through the refrigerant passage of the heat pump, the water temperature on the hot water storage tank 7 side rises and reaches the temperature rising limit by the heat pump. If the heat collection is continued as it is, the heat transfer efficiency from the refrigerant decreases, the condensation in the condenser becomes impossible, and the heat pump circuit 5 system gradually becomes high temperature and high pressure,
The compressor 1 is stopped or destroyed. When the water temperature of the hot water storage tank 7 is higher than the temperature rising limit by the heat pump, the refrigerant flow path is switched from the first condenser 2 side to the second condenser 21 side, so that the hot water storage tank 7 In some cases, the heat collecting operation need not be wastefully performed, and the heat collecting operation (= cooling operation of the bath water) can be continuously performed from the bath water. Further, heat can be used for a heat-dissipation load unit other than the hot-water heater.

(Embodiment 8) FIG. 8 is a block diagram of a heat pump type hot water recovery and cold storage system according to Embodiment 8 of the present invention.
8, the refrigerant flowing in the heat pump circuit 5 is switched from the first condenser 2 side to the second condenser 21 by the refrigerant flow switching means 22. The hot water tank temperature detecting means 40 detects the water temperature as the inlet water temperature of the hot water supply heat exchanger during the heat collecting operation and transmits a detection signal to the operation control means 20.
When the hot water storage tank water temperature is equal to or higher than the set temperature, the operation control means 20 switches the refrigerant flow switching means 22 from the first condenser 2 to the second condenser 21 to continue the heat collecting operation.

The operation and operation of the above configuration will be described with reference to FIG. With the progress of the heat collecting operation to the hot water storage tank 7 via the first condenser 2 through the refrigerant passage of the heat pump, the water temperature on the hot water storage tank 7 side rises and reaches the temperature rising limit by the heat pump. If the heat collection is continued as it is, the efficiency of heat transfer from the refrigerant decreases, the condensation in the condenser becomes impossible, the temperature of the heat pump circuit 5 system gradually increases to high temperature and high pressure, and the compressor 1 is stopped or destroyed. Therefore, the heat recovery operation is started (S37), and the water temperature of the hot water storage tank 7 is detected by the hot water storage tank temperature detection means 40, and the detection signal is transmitted to the operation control means 2
Send to 0. If the detected temperature t by the operation control unit 20 determines that higher than the predetermined temperature t _t, switched refrigerant passage by the refrigerant flow path switching means 22 from the first condenser 2 side to the second condenser 21 side ( S39) The release of the bathwater heat is performed in the second condenser 21, and the heat recovery operation from the bathwater is continued. In this way, the destination for using the hot water is automatically selected and executed, so that the heat collecting operation does not needlessly be performed when the hot water storage tank 7 has too much heat. Further, heat utilization for a heat-dissipation load portion other than the hot-water supply device is effectively performed.

(Embodiment 9) FIG. 9 is a configuration diagram of a heat pump type bath hot water heat recovery and storage system according to Embodiment 9 of the present invention.
In FIG. 9, the flow path is opened from the bath pump 17 to the water discharge path 15a by the flow path switching means 14, and the return flow path 15b is connected to the bathtub return flow path by the second flow path switching means 13. I do.

The operation and operation of the above configuration will be described. This bath hot water utilization circuit guides cold water stored in a bath tub, for example, after collecting the bath water heat, to a circulation flow path other than the bath heat exchanger 10 and the bath circulation circuit 12 to effectively respond to a cold load request. Can be used. Also,
The bath heat is not collected by the heat pump circuit 5, but is circulated through the circuits 15a and 15b to be used for the heat radiation load section.

(Embodiment 10) FIG. 10 shows Embodiment 1 of the present invention.
FIG. 1 is a configuration diagram of a heat pump type bath hot water heat recovery and cold storage system of No. 0; 10, the refrigerant temperature detecting means 27 detects the inlet refrigerant temperature of the heat recovery heat exchanger 4 and transmits a detection signal to the operation control means 20, and the operation control means 20 determines that the detected temperature of the refrigerant temperature detecting means 27 is a predetermined value. When the temperature drops,
The operation of the compressor 1 and the bath pump 17 is stopped.

The operation and operation of the above configuration will be described with reference to FIG. In the operation of heating and storing the water in the hot water storage tank 7 while collecting the heat of the bath water, when the bath heat exchanger 10 freezes and the bath water does not circulate and cannot absorb heat, or the refrigerant in the heat pump circuit 5 leaks and the refrigerant in the heat pump circuit 5 leaks. When the amount is small, when the heat pump is operated, the temperature of the refrigerant flowing into the heat recovery heat exchanger 4 sharply decreases. Heat recovery operation (S4
3) During the operation, the refrigerant temperature of the heat pump circuit is detected by the refrigerant temperature detecting means 27 and the detection signal is transmitted to the operation control means 2.
Send to 0. The operation control means 20 determines whether or not the detected refrigerant temperature t _cooling is equal to or less than the reference value t _{cooling 0} , and if not, stops the heat pump operation (S45). Immediately thereafter, the heat recovery operation (bath water side) ) Is stopped (S46). Therefore, since the compressor 1 does not perform liquid compression, the reliability is improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a bath water heat recovery and cold storage system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a bath water heat recovery and cold storage system according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a bath water heat recovery / cold storage system according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a bath water heat recovery / cold storage system according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of a bath water heat recovery / cold storage system according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a bath water heat recovery / cold storage system according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of a bath water heat recovery / cold storage system according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of a bath water heat recovery / cold storage system according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram of a bath water heat recovery / cold storage system according to a ninth embodiment of the present invention.

FIG. 10 is a configuration diagram of a bath water heat recovery / cold storage system according to a tenth embodiment of the present invention.

FIG. 11 is a configuration diagram of a bath water heat recovery / cold storage system according to another configuration of the first embodiment of the present invention.

FIG. 12 is a configuration diagram of a conventional bath water heat recovery system.

FIG. 13 is a control flow chart according to the first and second embodiments of the present invention.

FIG. 14 is a control flowchart according to another example of the first and second embodiments of the present invention.

FIG. 15 is a control flow chart according to a third embodiment of the present invention.

FIG. 16 is a control flow chart according to a fourth embodiment of the present invention.

FIG. 17 is a control flow chart according to a fifth embodiment of the present invention.

FIG. 18 is a control flow chart according to a sixth embodiment of the present invention.

FIG. 19 is a control flow chart according to an eighth embodiment of the present invention.

FIG. 20 is a control flow chart according to a tenth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 First condenser 3 Decompression means 4 Heat recovery heat exchanger 5 Heat pump circuit 6 Hot water supply heat exchanger 7 Hot water storage tank 8 Hot water supply circuit 9 Hot water supply pump 10 Bath heat exchanger 11 Bathtub 12 Bath circulation circuit 13 Second flow Path switching means 14 flow path switching means 15a water discharge path 15b return flow path 16 bypass flow path 17 bath pump 18 second temperature detecting means 19 first temperature detecting means 20 operation control means 21 second condenser 22 refrigerant flow switching means 27 Refrigerant temperature detecting means 40 Hot water tank temperature detecting means 50 Heat recovery means 70 Bypass opening / closing means

Claims (10)

[Claims] 1. A heat exchanger for recovering heat of a bath water and performing a cooling operation, a bath circuit comprising a bath heat exchanger having a heat exchange relationship with the heat exchanger, a bath water circulation pump, and a bath tub; A bath water circulation bypass flow path branched from an outlet of the circulation pump and connected to a return flow path returning to the bathtub; and a flow path switching means for the bypass flow path, a bath between the bath water circulation pump outlet and the bathtub. Provided in a circuit, wherein the flow path switching means can switch between a flow path only for the bath heat exchanger and a flow path in which the bypass flow path and the flow path to the bath heat exchanger are parallel. Bath water heat recovery and cold storage system. 2. The bath water according to claim 1, wherein said heat exchanger performs a cooling operation using a heat pump circuit in which a compressor, a condenser, a pressure reducing means, and a heat recovery heat exchanger are sequentially connected. Heat recovery cold storage system. 3. 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 a heat pump circuit.
The flow path switching means opens the bath heat exchanger and the bypass flow path in parallel, and thereafter, the temperature detected by the temperature detection means is higher than the first set temperature.
3. The bath water heat recovery and storage system according to claim 2, further comprising operation control means for switching the flow path to only the bath heat exchanger by the flow path switching means when the temperature is raised to the set temperature. 4. When the temperature detected by said temperature detecting means drops by a predetermined temperature width immediately after switching the flow path to only the bath heat exchanger side, said flow path switching means switches said bath heat exchanger and said bypass flow path. 4. The hot-water recovery and cold storage system according to claim 2, further comprising operation control means for opening a flow path in parallel. 5. A method for detecting a water temperature at the entrance of the bath heat exchanger.
1 temperature detecting means, storing means for storing the detected temperature based on the first temperature detecting means, and second temperature detecting means for detecting the water temperature at the outlet of the bath heat exchanger, wherein the second When the detected temperature based on the temperature detecting means drops to the set temperature, the detected temperature based on the first temperature detecting means is stored in the storage means, and the flow is switched in parallel with the bath heat exchanger and the bypass flow path by the flow path switching means. Switching means for controlling a flow rate of the bath water circulation pump so as to switch a path and to make a difference between a detected temperature based on the first temperature detecting means and a stored detected temperature larger than a predetermined temperature difference. Item 4. A bath water heat recovery / cold storage system according to Item 2. 6. When the operation by the heat pump circuit is started, the flow path switching means switches the flow path between the bath heat exchanger and the bypass flow path in parallel and operates the bath water circulation pump, and a predetermined time from the start of operation of the bath water circulation pump. 6. The hot-water collecting and storing system according to claim 2, further comprising operation control means for operating the compressor with a delay. 7. The heat pump circuit according to claim 1, further comprising a second condenser in parallel with the condenser, and a refrigerant flow switching means for switching a refrigerant flow toward the second condenser. Item 7. A bath water heat recovery and cold storage system according to any one of Items 2 to 6. 8. A hot water supply heat exchanger having a heat exchange relationship with a condenser of the heat pump circuit, and a heat load unit having a temperature detection means for detecting an inlet water temperature of the hot water supply heat exchanger, based on the temperature detection means. 8. The hot-water collecting and storing system according to claim 7, further comprising operation control means for switching a refrigerant flow path of the heat pump circuit to the second condenser when the detected temperature is equal to or higher than a predetermined temperature. 9. The system according to claim 1, wherein said flow path switching means has an outflow path to a heat load device other than said bypass flow path or bath circuit. 10. A refrigerant temperature detecting means for detecting a refrigerant temperature at an inlet of a heat recovery heat exchanger, and a stop control for stopping an operation of the compressor when a detected temperature based on the refrigerant temperature detecting means falls to a predetermined temperature. The hot-water collecting and storing system according to any one of claims 2 to 6, further comprising means.