JPH11211270A - Waste heat recovery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a waste heat recovery system which enables effective re-using of waste heat by recovering it from hot water of a bathtub and electric appliances. SOLUTION: A compressor 1, a condenser 2 for heat exchange with water circulating through a regenerative tank 14, a first heat exchanger 3 for heat exchange with hot water of a bathtub, a second heat exchanger 4 which is connected in parallel to the first heat exchanger 3 to perform a heat exchange with outside air and choking means 7a and 7b are connected by piping to form a refrigeration cycle apparatus 5. A refrigerant circuit is so arranged to let it switch between a waste heat recovery operation in which the first heat exchanger 3 is operated to store hot heat of the hot water of the bathtub into the heat storage tank 14 and a regenerative operation in which the second heat exchanger 4 is operated to store hot heat absorbed from outside air into the heat storage tank 14. The hot heat stored in the heat storage tank 14 is utilized by a hot water utilization means 16. In addition, the heat storage tank 14 is filled with a latent heat storage material 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust system for reusing heat by recovering waste heat such as waste water from a bathtub or waste heat from a refrigerator and heating the water. The present invention relates to a heat recovery system.

[0002]

2. Description of the Related Art FIG. 16 shows the thermal energy of a living space published in a collection of OHP manuscripts for publication at the 2nd Research Contents Review Meeting of the Living Value Creation Housing Development Technology Research Association (issued on November 22, 1995). It is explanatory drawing which shows the flow of. Various energy sources are used for various purposes, and among the exhaust heat after use, 17% of the heat generated by the hot water from the kitchen, the wash surface, the bath, and the laundry is shown. Further, the heat generated by the air from the electrical equipment accounts for 53% of the whole, and the amount of heat discharged from the refrigerator is equivalent to about 23% of the energy consumption in the house in terms of the total daily heat.

FIG. 17 is a block diagram showing a conventional general hot water supply unit, a bathtub, a refrigerator, and a cooling / heating air conditioner. FIG. 17A shows a hot water supply unit, FIG. FIG. 17C shows a refrigerator-freezer, and FIG. 17D shows a cooling / heating air conditioner. FIG. 17A shows a unit for supplying city water, for example, using city gas as an energy source and turning it into hot water using a gas water heater. FIG. 17B shows a bathtub unit that circulates bathtub water to make hot water using, for example, city gas as an energy source, and the hot water after bathing is drained. FIG. 17C shows a refrigerator-freezer having a configuration in which a compressor, a decompression unit, and an evaporator are connected by piping to circulate a refrigerant, and the evaporator cools a freezing room and a refrigerating room. The heat at this time is discharged into the air by heat radiation of the air. FIG.
In a heating and air-conditioning system, a compressor, an indoor heat exchanger, a decompression unit, and an outdoor heat exchanger are connected by piping to circulate a refrigerant,
When performing indoor cooling, the indoor heat exchanger is operated as an evaporator and the outdoor heat exchanger is operated as a condenser. When heating the indoor, the outdoor heat exchanger is operated as an evaporator and the indoor heat exchanger is used as an evaporator. The heat exchanger is operated as a condenser. In the outdoor heat exchanger having this configuration, hot and cold heat is discharged into the air.

[0004] As described above, the energy source is independently used in the conventional living space. In recent years, however, the demand for effective use of the energy source has increased, and heat recovery from hot wastewater such as a bathtub has been studied. . One example is disclosed in
There is a hot water supply device using hot waste water disclosed in Japanese Patent No. 55332. FIG. 18 is a configuration diagram showing a hot water supply device using hot waste water disclosed in Japanese Patent Application Laid-Open No. 57-55332. In the figure, reference numeral 81 denotes a heat pump type refrigerator, which connects a refrigerant compressor 81a, a hot water supply coil 81b, a pressure reducing device 81c such as a capillary tube, and a heating coil 81d by a pipe 81e to circulate the refrigerant. 82 is a medium water tank, 8
3 is a heat storage water tank. Then, the endothermic coil 81b connected to the refrigerator 81 is immersed in the intermediate water tank 82,
The heating coil 81d is heat conductively wound around the lower part of the outer periphery of the heat storage water tank 83. With this device, hot waste water of about 40 ° C. used in baths, showers, etc. is stored at about 35 ° C. in a middle water tank 82, and the heat absorbing coil 81b of the refrigerator 81 is heated by this hot waste water to evaporate the refrigerant. Heating coil 81d
The condensing heat is transmitted to the heat storage water tank 83 to heat the water.

FIG. 19 is a block diagram showing a refrigeration cycle apparatus having an ice heat storage tank. As shown in the figure, a compressor, a heat exchanger, a decompression device, and an ice storage tank are connected by pipes to circulate the refrigerant, and the cold stored in the ice storage tank with ice is used for a cooling load such as cooling air conditioning. Configuration. During the operation of this refrigeration cycle apparatus, warm exhaust heat when performing ice heat storage in the ice heat storage tank has been discharged into the air by the heat exchanger.

[0006]

Since the conventional exhaust heat recovery system is configured as described above, the intermediate water tank 82
It is necessary to provide. This medium water tank 82 is, for example, 40
It is described as 0 liters, and there is a problem that if an attempt is made to introduce this system in an actual home, the cost for equipment investment is greatly increased. That is, in a conventional house, the drainage of the bathtub flows under the house, and the intermediate water tank 82 for storing the drainage is provided, for example, underground. Was difficult.

[0007] Further, the exhaust heat of the electric equipment for cooling the inside of the refrigerator with the refrigerator is wasted to the surrounding air, and the heat is not recovered and reused. In particular, refrigerators are operated all day, and the amount of heat exhausted is equivalent to 23% of the energy consumption in the house. In addition, the heat radiated to the surrounding air cannot be reused, and the energy consumption increases unnecessarily,
There is a problem that global warming is promoted due to an increase in CO ₂ emission. However, since the refrigerator generates a small amount of heat per unit time, it is very difficult to recover the exhaust heat, and the refrigerator has not been realized.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to recover and reuse the normally discarded warm exhaust heat such as bathtub water and electric equipment, thereby conserving waste heat. The purpose is to obtain a system.

[0009]

An exhaust heat recovery system according to the present invention utilizes a heat storage tank through which water flows around a latent heat storage material filled therein, and heat stored in the heat storage tank as hot water. Hot water utilization means, a compressor, a condenser for heat exchange with water circulating in the heat storage tank, a first heat exchanger for heat exchange with bathtub water, and connected in parallel with the first heat exchanger for heat exchange with outside air. A refrigeration cycle device that forms a refrigerant circuit by connecting a second heat exchanger and a throttling means with a pipe, and operates the first heat exchanger to collect the heat of the bath water and store the heat in the heat storage tank. The refrigerant circuit can be switched between an exhaust heat recovery operation to be performed and a heat storage operation in which the second heat exchanger is operated to store heat absorbed from outside air in the heat storage tank.

Further, the exhaust heat recovery system according to the present invention comprises a compressor, a condenser for exchanging heat with water circulating in a heat storage tank,
A first heat exchanger for exchanging heat with the bathtub water, a second heat exchanger connected in parallel with the first heat exchanger and exchanging heat with the outside air, and a throttling means connected by a pipe to form a refrigerant circuit and the compression A refrigerating cycle device having a first bypass circuit for causing a refrigerant discharged from the machine to flow into a first heat exchanger; and hot water utilization means for utilizing heat stored in the heat storage tank as hot water. A refrigerant circuit that connects a condenser and a first heat exchanger and operates the first heat exchanger as an evaporator to perform an exhaust heat recovery operation; and the compressor, a first bypass circuit,
A refrigerant that connects the first heat exchanger and the second heat exchanger, operates the first heat exchanger as a condenser, and operates the second heat exchanger as an evaporator to supply hot heat to the bathtub water. It is configured to switch between circuits.

Further, the exhaust heat recovery system according to the present invention comprises a compressor, a condenser for exchanging heat with water circulating in a heat storage tank,
A first heat exchanger for exchanging heat with the bathtub water, a second heat exchanger connected in parallel with the first heat exchanger and exchanging heat with the outside air, and a throttling means connected by a pipe to form a refrigerant circuit and the compression A refrigerating cycle device having a second bypass circuit for allowing a refrigerant discharged from the machine to flow into a second heat exchanger; and hot water utilization means for utilizing heat stored in the heat storage tank as hot water. A refrigerant circuit that connects a condenser and a first heat exchanger and operates the first heat exchanger as an evaporator to perform an exhaust heat recovery operation; and the compressor, a second bypass circuit,
The second heat exchanger and the first heat exchanger or another evaporator are connected to operate the second heat exchanger as a condenser and operate the first heat exchanger or the another evaporator as an evaporator. And a refrigerant circuit.

Further, the exhaust heat recovery system according to the present invention comprises first temperature detecting means for detecting the temperature of the outside air and second temperature detecting means for detecting the temperature of the bath water.
The temperature of the outside air detected by the second temperature detecting means and the temperature of the bathtub water are compared, and the first heat exchanger and the second
The operation of the heat exchanger is switched.

The exhaust heat recovery system according to the present invention comprises a compressor, an evaporator for supplying cold heat to a cooling space, a first condenser for exchanging heat with water circulating in a heat storage tank, and a first condenser in parallel with the first condenser. A second condenser that is connected to exchange heat with air, and a cooling device that forms a refrigerant circuit by connecting throttling means with piping, and hot water utilization means that uses the heat stored in the heat storage tank as hot water, The refrigerant circuit is operated by an exhaust heat recovery operation of storing the exhaust heat by operating the first condenser to supply the cold heat in the heat storage tank and a heat radiation operation of operating the second condenser to radiate heat to the surrounding air. It is configured to be switchable.

Further, the exhaust heat recovery system according to the present invention has a third temperature detecting means for detecting the temperature of air before heat exchange in the second condenser and a fourth temperature detecting means for detecting the temperature of water circulating in the heat storage tank. Temperature detecting means for comparing the temperature of the air detected by the third and fourth temperature detecting means with the temperature of the circulating water, and operating the first condenser and the second condenser in accordance with the comparison result. Is switched.

Further, the exhaust heat recovery system according to the present invention is provided with a water amount detecting means for detecting an amount of cold water which is not supplied with sufficient heat among the water circulating in the heat storage tank, and the water amount detecting means detects the amount of cold water. When the amount of the cold water is equal to or less than a predetermined amount, the second condenser is operated to perform a heat radiation operation of discharging the ambient water to the surroundings.

Further, the exhaust heat recovery system according to the present invention is provided with a water circulation path for taking out water below the heat storage tank, exchanging heat with the first condenser to make hot water, and returning the hot water below the heat storage tank. It is a thing.

Further, in the exhaust heat recovery system according to the present invention, the cooling device is a refrigerator or a freezer.

Further, the exhaust heat recovery system according to the present invention comprises a low-temperature heat recovery tank for storing a liquid that has exchanged heat with the exhaust heat of a plurality of electric devices, a compressor, and a condenser for exchanging heat with water circulating in the heat storage tank. A refrigeration cycle device that forms a refrigerant circuit by connecting an evaporator that exchanges heat with the liquid in the low-temperature heat recovery tank by piping, and hot water utilization means that uses the heat stored in the heat storage tank as hot water. It is provided.

Further, the exhaust heat recovery system according to the present invention is characterized in that the waste water used by the hot water utilization means flows into the low temperature heat recovery tank.

Further, the exhaust heat recovery system according to the present invention comprises the step of connecting at least one electric device to a compressor for an electric device,
A heat exchange unit for exchanging heat with a low-temperature heat recovery tank, a throttling means for electric equipment, and an evaporator for electric equipment connected by a pipe to circulate a refrigerant and use the cold heat obtained by the evaporator for electric equipment for cooling. Further comprising an ice heat storage tank, performing cooling with the evaporator for electric equipment, operating the ice heat storage tank as an evaporator to store cold heat therein, and performing heat exchange with the low-temperature heat recovery tank. The heat exchange unit is operated as a condenser, and the ice heat storage tank is operated as a subcooling heat exchanger for supercooling the refrigerant, and the heat storage unit can be switched between a heat storage operation and a cold storage operation in which the heat is supplied to the electric device evaporator. It was done.

Further, in the exhaust heat recovery system according to the present invention, a time period for storing heat in the heat storage tank is set, and control is performed such that heat is stored in the heat storage tank during this time period.

Further, the exhaust heat recovery system according to the present invention is configured such that a latent heat storage material is filled in a heat storage tank and water flows around the material.

Further, the exhaust heat recovery system according to the present invention comprises a refrigeration cycle apparatus in which a compressor, a first heat exchanger, a throttle means, and a second heat exchanger are connected by piping, and a refrigerant circulates; A first latent heat storage tank having a first latent heat storage material for storing heat at a first temperature by exchanging heat with a refrigerant in an exchanger; and a first latent heat storage tank having a second heat exchanger and exchanging heat with a refrigerant to be different from the first temperature A second latent heat storage tank having a second latent heat storage material for storing heat at a second temperature, wherein one of the first and second heat exchangers is operated as an evaporator, This is to store cold heat in a latent heat storage tank that exchanges heat with the other, and operate the other heat exchanger as a condenser to store warm heat in the latent heat storage tank that exchanges heat with the condenser.

Further, in the exhaust heat recovery system according to the present invention, of the first and second latent heat storage materials, the latent heat storage material for storing heat is solidified and stored at a temperature higher than the temperature at which the heat is stored. In addition, the latent heat storage material that stores cold heat is solidified at a temperature lower than the temperature at which heat is stored and heat is stored.

Further, the exhaust heat recovery system according to the present invention is configured such that a pipe constituting a refrigeration cycle device passes through at least one of the first and second latent heat storage tanks. Things.

In the exhaust heat recovery system according to the present invention, a latent heat storage tank for storing heat, of the first and second latent heat storage tanks, stores heat at a temperature higher than 0 ° C. The latent heat storage tank for storing heat is an ice storage tank for storing cold heat of 0 ° C.

Further, the exhaust heat recovery system according to the present invention is configured such that the heat or cold stored in at least one of the first and second latent heat storage tanks is used as a heat load or a cold load. It is.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, an exhaust heat recovery system according to Embodiment 1 of the present invention will be described.
FIG. 1 is a circuit configuration diagram showing an exhaust heat recovery system according to the present embodiment. In the figure, 1 is a compressor, 2 is a condenser,
3, a first heat exchanger; and 4, a second heat exchanger connected in parallel with the first heat exchanger 3. A compressor 1, a condenser 2, a first heat exchanger 3, and a second heat exchanger 4 are connected by a refrigerant pipe, and a refrigerant is circulated inside to form a refrigeration cycle device 5.
6a and 6b are piping opening / closing means, for example, an electromagnetic valve,
Reference numerals a and 7b denote aperture means. These aperture means 7a, 7b
Is a means for adjusting the pressure of the refrigerant by, for example, the degree of opening of the valve, and changing the degree of opening of the valve and changing the pressure of the refrigerant by automatically or by controlling the degree of opening of the valve. There are things. The first heat exchanger 3 is a refrigerant-water heat exchanger for absorbing heat from bathtub water. For example, a plate-type heat exchanger has a structure in which hot water passes through the outside of a refrigerant pipe or a double-tube heat exchanger. It has a structure for exchanging heat between refrigerant and hot water. The second heat exchanger 4 is a refrigerant-air heat exchanger for absorbing heat from the atmosphere. For example, the second heat exchanger 4 has a plate fin tube heat exchanger and a structure in which external air is blown to a refrigerant pipe by a fan. In this circuit configuration of the refrigerant circuit, the refrigeration cycle apparatus 5 is operated by the solenoid valves 6a and 6b.
The first heat exchanger 3 and the second heat exchanger 4
Can be switched by.

Further, reference numeral 10 denotes a first water circulation path, and 11 denotes a first water circulation path.
A pump provided in the water circulation path 10, a hot water supply unit 12,
3 is a city water inlet directly connected to a water pipe, 14 is a heat storage tank, for example, a heat storage tank, 15 is a latent heat storage material enclosed in a capsule filled in the heat storage tank 14, and 16 is a hot water supply port and a heat storage tank 14 Outlet of hot water from The heat storage tank 14 is filled with a capsule in which a latent heat storage material 15 such as sodium acetate or aluminum alum is sealed, and has a structure in which water or hot water can flow around the capsule. Note that the capsule is formed of, for example, polypropylene or polyethylene. Latent heat storage material 15
If the heat is stored in the heat storage tank 14, for example, water of about 10 ° C. to 20 ° C. that flows into the heat storage tank 14 from the city water inlet 13 flows from the latent heat storage material 15 while flowing around the capsule inside the heat storage tank 14. The hot water of, for example, about 60 ° C. can be obtained from the hot water supply port 16 upon receipt. Condenser 2
Inside, the refrigerant and water circulate in separate flow paths, and can exchange heat with each other by the structure described above. Pump 11
Accordingly, the water circulating in the first water circulation path 10 receives the heat of the refrigerant flowing through the refrigeration cycle device 5 in the condenser 2, and gives heat to the latent heat storage material 15 when flowing through the heat storage tank 14. The latent heat storage material 15 is a material that stores and releases heat by performing a phase change between a liquid and a solid. The temperature of the heat stored in the heat storage tank 14, that is, the temperature supplied to the hot water supply port 16 differs depending on the solidification temperature. . For example, heat can be stored at a temperature of about 40 ° C. for sodium acetate and about 90 ° C. for aluminum alum. Heating to water in the condenser 2 may be performed according to the latent heat storage material 15.

Further, reference numeral 20 denotes a second water circulation path for circulating bath water, 21 denotes a pump provided in the second water circulation path 20, 22 denotes a bathtub, and 23 denotes a hot water supply port for supplying hot water. After the hot water supplied at the hot water supply port 23 enters the bath, the hot water flows through the second water circulation path 20 by the pump 21, and the refrigeration cycle apparatus 5 is supplied by the first heat exchanger 3.
The heat recovered is discharged to the drainage unit 24.

Hereinafter, the exhaust heat of the bathtub 22 is supplied to the hot water supply unit 12.
The operation used in will be described. The electromagnetic valve 6a is opened, the electromagnetic valve 6b is closed, and the first heat exchanger 3 is operated.
The inside of the first heat exchanger 3 has a structure in which a refrigerant and water circulate through separate flow paths and can exchange heat with each other. Heat is transmitted from the bathtub water circulating in the second water circulation path 20 by the pump 21 to the refrigerant flowing in the refrigeration cycle device 5 in the first heat exchanger 3. The heated and evaporated refrigerant passes through the compressor 1 and into the condenser 2 as described above in the first water circuit 1.
Heat is exchanged with the water circulating 0 to give heat. In this case, the first heat exchanger 3 operates as an evaporator.

When the exhaust heat of the bathtub water is recovered as described above, the temperature of the bathtub water gradually decreases. When the temperature of the bathtub water becomes lower than the temperature of the surrounding air in which the second heat exchanger 4 is placed, for example, the temperature of the outside air, it becomes unnecessary to recover the heat. If the heat is to be further recovered as it is, the operation efficiency of the refrigeration cycle apparatus 5 will deteriorate, so the heat exchanger is switched to the second heat exchanger 4 to absorb heat from the outside air. As a specific method, the electromagnetic valve 6a is closed, the electromagnetic valve 6b is opened, and the second heat exchanger 4 is brought into an operating state. The blower attached to the second heat exchanger 4 takes in air near the location where the second heat exchanger 4 is installed, circulates the air, and exchanges heat with the refrigerant. The refrigerant is given heat by exchanging heat with air and exchanges heat with the water circulating in the first water circuit 10 through the compressor 1 and in the condenser 2 as previously described. At this time, the second heat exchanger 4 operates as an evaporator.

It is to be noted that the exhaust heat recovery operation of the bathtub water is desirably operated from about 1:00 am to about 6:00 am when the bathing of the family member is completed within one day. However, in the case of a general home bathtub, if the refrigeration cycle apparatus 5 is appropriately sized, heat is recovered in about 2 hours and the temperature of the bathtub water is 35 ° C.
About 10 ° C., which is lower than the temperature of the outside air. Therefore, when the temperature of the bathtub water falls below the temperature of the outside air, the operation is switched to the second heat exchanger 4, and the normal heat storage operation is performed until the necessary heat is stored in the heat storage tank 14. In this normal heat storage operation, the operation cost can be reduced by using a time zone in which the nighttime electricity rate is low.

Hereinafter, an example of operation control of the exhaust heat recovery system according to the present embodiment will be described. FIG. 2 is a flowchart showing a procedure of operation control of the exhaust heat recovery system.
The heat storage tank 14 is full in the morning, and the hot water inside is discharged from the hot water supply port 16 according to the load of hot water supply per day.
City water is replenished from the city water mouth for the reduced amount of hot water. Hot water heating for heating hot water and supplying hot water to the heat storage tank 14 is performed in a predetermined time period, for example, between 23:00 which is a midnight power time period and 7:00 in the next morning. Here, a state in which the heat storage capacity of the heat storage tank 14 is substantially maximized, or a state in which a sufficient amount of heat is stored in consideration of an object of using heat in the operation of the exhaust heat recovery system is referred to as full storage. After the start (START), the temperature of the outside air and the temperature of the bath water are detected in ST1. As a detecting means for detecting the temperature of the bath water,
For example, a temperature sensor is provided in the second water circulation path 20 to detect the temperature of the circulating water. Further, as a detecting means for detecting the temperature of the outside air, for example, a temperature sensor is provided on a side surface of the second heat exchanger 4 to detect the temperature of the outside air. In ST2, it is determined whether or not the heat storage amount of the heat storage tank 14 is full, and if it is full, the process ends (END). Whether or not the heat storage tank 14 is full can be determined, for example, by detecting the temperature of the lower part of the heat storage tank 14 where the cold water accumulates. When the detected temperature of the lower part of the heat storage tank 14 is lower than a predetermined heat storage temperature, for example, about 60 ° C., it is determined that the heat storage amount of the heat storage tank 14 is not yet full, and the time is set in advance in ST3. It is determined whether it is the midnight power time zone. If it is not between 23:00 and 7:00, that is, other than late-night power hours,
The process ends without performing the bathtub water exhaust heat recovery operation or the normal heat storage operation (END).

If it is determined in ST3 that it is the midnight power time zone, it is determined in ST4 whether the time is a predetermined time, for example, between 1:00 and 6:00. Even in midnight power hours, 1
At times other than between 6:00 and 6:00, there is a possibility that the family may take a bath, and the normal heat storage operation is performed without performing the exhaust heat recovery operation of the bathtub water. Since the predetermined time varies depending on the family structure, life pattern, and the like, it is preferable that the predetermined time be variably set. For example, it is easy to use if a system that sets the exhaust heat recovery system or a resident who uses the exhaust heat recovery system can arbitrarily change the above time zone. Next, in ST5, the temperature of the bathtub water and the temperature of the outside air are compared. As a result of the comparison, when the temperature of the bathtub water is higher than the temperature of the outside air, the exhaust heat recovery operation of the bathtub water is performed in ST6. This is an operation in which the first heat exchanger 3, which is a refrigerant-water heat exchanger, is operated to recover heat from the bathtub water and store it in the heat storage tank 14 as hot water for hot water supply. When the temperature of the bath water is lower than the temperature of the outside air, a normal heat storage operation is performed in ST7. This is the second heat exchanger 4 which is a refrigerant-air heat exchanger.
Is operated to absorb heat from outside air and boil.
In ST6 and ST7, the solenoid valves 6a and 6b are switched for each operation to form a refrigerant circuit. In the case of the normal heat storage operation in ST7, in addition to this, the blower of the second heat exchanger 4 is set to the operating state and the process is ended. (END). This operation control is executed at fixed time intervals, for example, at one minute intervals.

By performing such operation control, when the temperature of the bathtub water is high, the exhaust heat of the bathtub water is recovered, and when the temperature of the bathtub water falls, the operation is switched to the normal heat storage operation. The operation efficiency of the cycle device 5 can be prevented from lowering.

In the above operation control, in ST5, the temperature of the bath water is compared with the temperature of the outside air, and the result is switched between the exhaust heat recovery operation of the bath water and the normal heat storage operation according to the result. And ｛outside air temperature-(2 ° C or 1
℃)｝, the temperature of bath water is 1 ℃ lower than the temperature of outside air
Alternatively, the exhaust heat recovery operation of the bathtub water may be performed until the temperature becomes lower by about 2 ° C. This is because the heat exchange performance of water is better than that of air. However, if the temperature of the outside air is too low and the temperature of the refrigerant due to the exhaust heat recovery operation may become 0 ° C. or less, the normal heat storage operation is performed in ST7 even if the temperature of the bathtub water is higher than the temperature of the outside air. It is desirable to do. In addition, from 23:00 which is a low-cost late-night power time zone,
The electric power at the time is used to perform the exhaust heat recovery operation of the bathtub water and the normal heat storage operation, but the setting of the low-priced electric power time zone is based on the convenience of the electric power company, and the time from 23:00 to 7:00 The belt is not limited to this. For example, even if the same amount of electric power is used, the amount of CO ₂ emission varies depending on the time zone and season. This is because it depends on the type of power generation, such as thermal power, hydropower, and nuclear power. CO
₂ If it is desired to reduce the amount of emissions, the time period in which the above-described exhaust heat recovery operation and the normal heat storage operation are performed may be set to a time period in which the amount of CO ₂ emission is small.

As a means for detecting the temperature of the bath water, a second
Although the temperature of the circulating water in the water circulation path 20 is detected, the temperature is not limited to this. For example, instead of detecting the temperature at fixed time intervals by providing a temperature sensor in the bathtub, and instead of actually detecting the temperature at fixed time intervals, the temperature of the bathtub water at the start of the exhaust heat recovery operation and the elapsed time from the start are measured. Based on this, the current temperature of the bathtub water may be detected by calculation.

The internal energy used for hot water supply from bathtub water is represented by equation (1). ΔQ = Qbath1−Qbath2 (1) where Qbath1 = ρ (Tbath1) × Cp (Tbath1) × Vbath1 × Tbath1 Qbath2 = ρ (Tbath2) × Cp (Tbath2) × Vbath2 × Tbath2 bath1: Start of heat recovery operation Subscript indicating time bath2: Subscript indicating end of exhaust heat recovery operation Tbath: Temperature of bathtub water (K) Qbath: Bathtub water internal energy (kcal) ρ (Tbath): Bathtub water density (function of Tbath) (kg / m ³ ) Cp (Tbath): Bath water constant pressure specific heat (function of Tbath) (kcal / kg · K) Vbath: Bathtub water volume (m ³ ).

In the present embodiment, there is an effect that the temperature of the bathtub water normally discarded can be recovered and reused in the hot water supply system 12. At this time, the amount of heat recovered in the heat storage tank 14 is expressed by the following equation (1). Is calculated. In fact, according to a trial calculation, the energy required to store a certain amount of heat in the heat storage tank 14 is reduced by about 12% compared to a case where the exhaust heat is not recovered.
Can be reduced. Therefore, by recovering waste heat and reusing it for hot water supply or air conditioning, it is possible to reduce energy consumption and CO ₂ emissions in houses and the like, and prevent global warming. In particular, unlike the conventional bath water recovery system, there is no need to provide a storage tank underground, and the bath water can be circulated using the bath water circulation holes provided in a normal bath kettle. , Can be easily applied to ordinary households. Further, by providing the second heat exchanger 4 and switching the bath tub water when it becomes cooler than the outside air and there is no need for heat recovery, it is possible to prevent the operation efficiency of the refrigeration cycle apparatus 5 from deteriorating. There is an effect that can be done.

Further, since the heat storage tank 14 is filled with the latent heat storage material 15, it is possible to always obtain a constant temperature of hot water from the tap hole 16. Further, the size of the hot water supply tank 14 can be reduced to, for example, about half the capacity of the case where the inside of the heat storage tank 14 is filled only with water. Therefore,
The space can be greatly reduced, and even when installed in a general household, there is no restriction on the place where it is placed, so that it can be easily applied.

In the above description, the switching between the first heat exchanger 3 and the second heat exchanger 4 is performed according to the temperature of the bathtub water and the outside air. It has become. In addition, the operation start time of the first heat exchanger 3, the operation end time of the first heat exchanger 3, and the second heat exchanger 4
The operation start time of the second heat exchanger 4 and the operation end time of the second heat exchanger 4 are configured to be configurable, and can be set according to the usage of the applicable place. It becomes a collection system. In addition, the first and second
One of the heat exchangers 3 and 4 is not always operated, and either may be stopped or both may be operated. In addition, by setting a driving time zone and controlling to drive during this set time zone, it is possible to use a low-cost midnight power time zone, drive during peak power hours, and Accordingly, an energy-saving effect can be obtained at a low cost without causing a problem in the use of other electric devices, and an easy-to-use exhaust heat recovery system can be obtained.

Further, in the first water circulation path 10, the water below the heat storage tank 14 is taken out, supplied with warm heat, and circulated so as to return above the heat storage tank 14, but is not limited to this. For example, a so-called convection-type heat storage tank may be used, in which water is taken out from below the heat storage tank to supply hot heat and return to below the heat storage tank. In this case, the outlet for water and the outlet for water are isolated inside, so that convection easily occurs. This convection makes the temperature of the water in the heat storage tank uniform. Depending on the exhaust heat recovery system, it may be better to have a temperature stratification in the heat storage tank, or it may be better to have a uniform temperature, and it is better to incorporate an appropriate one. Further, in the above description, the heat of the bathtub 22 is collected. However, the wastewater generated by the shower is temporarily stored in a tank, for example, and the heat is recovered. You may comprise so that drainage may be stored in a tank together. In this case, a tank for storing drainage from some kind of shower is required, but it is also possible to recover the heat of the shower that has been frequently used and discarded in recent years. Further, in the present embodiment, the configuration is such that the warm exhaust heat of the bathtub is used as hot water utilization means, for example, for the hot water supply unit 12.
Means for using hot water is not limited to this, and may be used for any means other than air conditioning.

Embodiment 2 Hereinafter, an exhaust heat recovery system according to Embodiment 2 of the present invention will be described. FIG. 3 is a circuit configuration diagram showing the exhaust heat recovery system according to the present embodiment. In the figure, reference numeral 31 denotes a first bypass circuit, which is a circuit for causing the refrigerant discharged from the compressor 1 to flow into the first heat exchanger 3. A second bypass circuit 32 is a circuit for causing the refrigerant discharged from the compressor 1 to flow into the second heat exchanger 4. Reference numeral 33 denotes a pipe opening / closing means provided downstream of a branch point of the refrigerant pipe constituting the refrigeration cycle apparatus 5 to the first and second bypass circuits 31 and 32, for example, solenoid valves, 31a and 32a.
Is a pipe opening / closing means provided in the first and second bypass circuits, for example, solenoid valves, respectively, and 31b is a refrigerant pipe from the first heat exchanger 3 to the compressor 1 downstream of a branch point to the first bypass circuit 31 For example, a solenoid valve, 3
Reference numeral 2b denotes a pipe opening / closing means provided in the refrigerant pipe from the second heat exchanger 4 to the compressor 1 downstream of a branch point to the second bypass circuit 32, for example, an electromagnetic valve. Here, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.

In the present embodiment, the first heat exchanger 3 is operated as an evaporator, the exhaust heat of bathtub water is recovered by the refrigerant circulating in the refrigeration cycle device 5, and the heat is stored in the heat storage tank 14. Is the same as in the first embodiment.
That is, in the exhaust heat recovery operation for recovering the temperature of the bathtub water, the solenoid valves 33, 6a, 31b are opened, and the solenoid valves 31a, 6b, 32b are opened.
Is closed, the compressor 1 → the solenoid valve 33 → the condenser 2 → the solenoid valve 6
a → throttling means 7 a → first heat exchanger 3 → solenoid valve 31 b → circulate refrigerant through compressor 1, evaporate in first heat exchanger 3,
The heat is condensed in the condenser 2 and the heat of condensation is stored in the heat storage tank 14. Similarly, the operation of operating the second heat exchanger 4 as an evaporator and storing the heat in the heat storage tank 14 by the refrigerant circulating in the refrigeration cycle device 5 is the same as in the first embodiment. That is, in the heat storage operation for storing the heat absorbed from the outside air, the solenoid valves 33, 6b, 32b are opened, and the solenoid valves 6a, 6a,
32a is closed, and the compressor 1 → the solenoid valve 33 → the condenser 2 → the solenoid valve 6b → the throttle means 7b → the second heat exchanger 4 → the solenoid valve 32
b → The refrigerant is circulated through the compressor 1, evaporated in the second heat exchanger 4, condensed in the condenser 2, and the heat of condensation is stored in the heat storage tank 14.

As described above, in the present embodiment, similarly to the first embodiment, the exhaust heat of the bathtub 22 is used in the hot water supply system 12, and the effect of recovering the normally discarded heat can be obtained. is there. According to a trial calculation, the energy required to store a certain amount of heat in the heat storage tank 14 can be reduced by about 12% as compared with the case where the exhaust heat is not recovered. Further, by providing the second heat exchanger 4 and switching the bath tub water to a point where the necessity of heat recovery is eliminated by cooling the bath water from the outside air, the efficiency of the refrigeration cycle apparatus 5 can be prevented from deteriorating. effective.

The heat storage tank 14 does not necessarily need to be filled with the latent heat storage material 15, and is configured to store only water like a normal hot water tank, and circulates this water through the first circulation path 10. Heat may be stored by using hot water. However, if the heat storage tank 14 is filled with the latent heat storage material 15, it is possible to always obtain hot water having a constant temperature from the hot water supply port 16. For example, when the storage water is used for a shower or the like, comfortable hot water is obtained. When used for water, it is easy to use, for example, one with a constant temperature can be obtained. Furthermore, when the heat storage tank 15 is filled with the latent heat storage material 15, the size of the hot water supply tank 14 can be reduced to, for example, about half the capacity as compared with the case where the inside of the heat storage tank 14 is filled only with water.

In this embodiment, a first bypass circuit 31 and a second bypass circuit 32 are further provided. First, the operation of the first bypass circuit 31 will be described. When operating the first bypass circuit 31, the solenoid valve 6
a, 6b, 31a, 32b are opened and the solenoid valves 33, 31b,
32a is closed, and the refrigerant flowing out of the compressor 1 is introduced into the first heat exchanger 3 through the first bypass circuit 31 and the solenoid valve 31a to be condensed. At the same time, the pump 21 is operated to circulate bath water in the second water circulation path 20. In the first heat exchanger 3, the bath water and the refrigerant flowing through the refrigeration cycle device 5 exchange heat, and the temperature of the bath water increases due to the heat of condensation of the refrigerant. Thereafter, the condensed refrigerant passes through the throttle means 7a and the solenoid valves 6a and 6b which have been fully opened, and passes through the throttle means 7
After being decompressed and expanded in b, it evaporates in the second heat exchanger 4 and returns to the compressor 1 from the solenoid valve 32b. That is, by providing the first bypass circuit 31, an operation of supplying hot water to the bathtub water can be performed, and for example, reheating of the bathtub water can be performed. In this case, the first heat exchanger 3 operates as a condenser, and the second heat exchanger 4 operates as an evaporator.

Next, the operation of the second bypass circuit 32 will be described. When operating the second bypass circuit 32, the solenoid valves 6a, 6b, 31b and 32a are opened and the solenoid valves 3a and 3b are opened.
3, 31a and 32b are closed, and the refrigerant flowing out of the compressor 1 passes through the second bypass circuit 32 and the solenoid valve 32a to the second
It is introduced into the heat exchanger 4 and condensed. Here, the throttling means 7 is set in a fully open state after heat exchange with air and heat release into the atmosphere.
b, after passing through the solenoid valves 6b and 6a and being decompressed and expanded by the throttle means 7a, evaporates in the first heat exchanger 3 and returns to the compressor 1 from the solenoid valve 31b. In this case, the second heat exchanger 4 is a condenser,
The first heat exchanger 3 operates as an evaporator, and in this configuration, the bath water is cooled by the first heat exchanger 3.
When the bathtub water is too hot, it can be cooled to adjust the temperature, and the temperature of the bathtub water can be adjusted without newly adding cold water. Also, for example, when a water cooler is used instead of bath water, the second bypass circuit 32 becomes effective.

FIG. 4 shows the storage of hot or cold heat in a tank for use in, for example, cooling / heating air conditioning or the like using the first bypass circuit 31 and the second bypass circuit 32 provided in FIG. 3 shows a circuit configuration. In the figure, reference numeral 34 denotes a heat exchanger, which is the discharge side and the suction side of the compressor 1 constituting the refrigeration cycle apparatus 5, the first heat exchanger 3,
It is connected to the second heat exchanger 4 by a refrigerant pipe. 3
Reference numerals 5a, 35b, and 35c denote solenoid valves, respectively, which are piping opening / closing means, and reference numeral 36 denotes a throttle means. The solenoid valve 35a is connected to the heat exchanger 3
4 is provided in a pipe connecting the discharge side of the compressor 1 to open and close the pipe. The solenoid valve 35b is provided on a pipe connecting the heat exchanger 34 and the suction side of the compressor 1, and opens and closes this pipe. The solenoid valve 35c is provided on a pipe connecting the heat exchanger 34 and the first and second heat exchangers and opens and closes this pipe. Reference numeral 37 denotes a water circulation path connecting the heat exchanger 34 and the tank 38, which has a pump.
At 4, heat exchange is performed with the refrigerant flowing through the refrigeration cycle device 5.
The tank 38 is configured to be capable of exchanging heat with water or a refrigerant circulating in the tank 38, and the heat or cold stored here can be used in a cooling / heating air conditioner, a panel heater, or the like.

In order to store cold or warm heat in the tank 38, water is circulated by a pump provided in the water circulation path 37, and heat exchange with the refrigerant flowing through the refrigeration cycle apparatus 5 is performed by the heat exchanger 34. Or store heat in warm water. When storing heat in the tank 38 with cold water, the heat exchanger 34 is operated as an evaporator, and the first heat exchanger 3 or the second heat exchanger 4
Operate as a condenser. For example, when operating the first heat exchanger 3, the electromagnetic valves 31a, 6a, 35c, 35b
Are opened, and the solenoid valves 33, 32a, 31b, 6b, 35a, 3
2b is closed. And the flow of the refrigerant is from the compressor 1 to the first
Bypass circuit 31 → electromagnetic valve 31a → first heat exchanger 3 → throttle means 7a fully opened → electromagnetic valve 6a → electromagnetic valve 35c
→ Throttle means 36 having a decompression function → heat exchanger 34 → electromagnetic valve 35b → compressor 1. For example, when operating the second heat exchanger 4, the solenoid valves 32a, 6b, 35c,
35b is opened and the solenoid valves 33, 32b, 6a, 35a, 32
b is closed. The flow of the refrigerant is as follows: the compressor 1 → the second bypass circuit 32 → the solenoid valve 32a → the second heat exchanger 4 → throttle means 7b which is fully opened → the solenoid valve 6b → the solenoid valve 35c →
Throttling means 36 having a pressure reducing function → heat exchanger 34 → solenoid valve 35 b → compressor 1.

When storing heat in the tank 38 with hot water, the heat exchanger 34 is operated as a condenser, and the first heat exchanger 3 or the second heat exchanger 4 is operated as an evaporator.
For example, when operating the first heat exchanger 3, the electromagnetic valve 35
a, 35c, 6a, 31b are opened and the solenoid valves 33, 35b,
6b, 31a and 32b are closed. Then, the flow of the refrigerant is as follows: the compressor 1 → the electromagnetic valve 35a → the heat exchanger 34 → the throttle means 36 which is fully opened → the electromagnetic valve 35c → the electromagnetic valve 6a → the throttle means 7a having a pressure reducing function → the first heat exchanger 3 → Solenoid valve 3
1b → Compressor 1. For example, when operating the second heat exchanger 4, the solenoid valves 35a, 35c, 6b, 32b are opened and the solenoid valves 33, 35b, 6a, 32a, 31b are closed. Then, the flow of the refrigerant is changed from the compressor 1 → the solenoid valve 35a →
Heat exchanger 34 → throttling means 36 fully opened → solenoid valve 3
5c → electromagnetic valve 6b → throttling means 7b having a pressure reducing function → second heat exchanger 4 → electromagnetic valve 32b → compressor 1.

As described above, the first bypass circuit 31 and the second
By providing the bypass circuit 32, the first and second heat exchangers 3 and 4 can be operated as a condenser or an evaporator as needed, and the waste heat can be used variously depending on the case. A recovery system is obtained. In particular, if the refrigeration cycle apparatus is configured so that the first heat exchanger 3 operates as a condenser, it is possible to reheat the bathtub water, so that an exhaust heat recovery system that is easy to use in ordinary households can be configured. .

In the above description, if the switching between the first heat exchanger 3 and the second heat exchanger 4 is controlled in accordance with the temperature of the bathtub water and the outside air, the operating efficiency of the refrigeration cycle apparatus 5 is reduced. Thus, a system capable of recovering exhaust heat without the need is obtained.
In addition, the operation start time of the first heat exchanger 3 and the first heat exchanger 3
, The operation start time of the second heat exchanger 4, the second
If the operation end time of the heat exchanger 4 is configured to be settable and can be set according to the use situation of the place to be applied, the exhaust heat recovery system can be applied to places in various situations. In addition, by setting a driving time zone and controlling to drive during this set time zone, it is possible to use a low-cost midnight power time zone, drive during peak power hours, and The exhaust heat recovery system can be operated in accordance with the requirements, the energy saving effect can be obtained at low cost, and the exhaust heat recovery system is easy to use.

In the present embodiment, the first bypass circuit 31 and the second bypass circuit 32 are both provided. However, the present invention is not limited to this, and either one of them may be used if necessary. For example, when reheating of bathtub water is necessary, an exhaust heat recovery system including the first bypass circuit 31 is configured, and when the second heat exchanger 4 is to be used as an outdoor unit of a cooling / heating device, An exhaust heat recovery system including the second bypass circuit 32 may be configured.

Embodiment 3 Hereinafter, an exhaust heat recovery system according to Embodiment 3 of the present invention will be described. The present embodiment relates to a system for recovering exhaust heat of, for example, a refrigerator-freezer as a cooling device. The refrigerator-freezer keeps the freezing room at, for example, about −5 ° C. and the refrigerating room at, for example, about 5 ° C., and is normally in operation for 24 hours. The waste heat generated in the refrigerator is recovered. A feature of the waste heat generated in the refrigerator is that the amount of heat per unit time is small, but may be generated for approximately 24 hours.

FIG. 5 is a circuit diagram showing an exhaust heat recovery system according to this embodiment. In the figure, reference numeral 40 denotes a third water circulation path, in which the water circulating flows around the capsule in which the latent heat storage material 15 filled in the heat storage tank 14 is stored. Also, 41 is a pump provided in the third water circulation path 40, 42 is a compressor, 43 is a first condenser, 44 is a second condenser connected in parallel with the first condenser 43, 45 is an evaporator, 46 Is a throttle means, and 47 is a cooling space, for example, a freezing room and a refrigerator room. 48a and 48b are piping opening / closing means, for example, electromagnetic valves. Compressor 42, 1st
The condenser 43, the second condenser 44, and the evaporator 45 are connected by a refrigerant pipe, and the refrigerant is circulated inside to form a refrigeration cycle device 49 for a cooling device. Refrigeration cycle device 49
Is usually arranged in the installation space of the refrigerator.

The first condenser 43 is a refrigerant for recovering exhaust heat generated by cooling the freezing room and the refrigerator compartment 47.
It is a water heat exchanger, and the second condenser 44 is a refrigerant-air heat exchanger that exchanges heat with the surrounding air in which it is placed. The condensers connected to the refrigeration cycle device 49 can be switched between the first condenser 43 and the second condenser 44 by the solenoid valves 48a and 48b. Here, the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.

The operation of utilizing the exhaust heat from the refrigerating cycle device 49 used in the freezer refrigerator in the hot water supply unit 12 will be described below. Open the solenoid valve 48a and the solenoid valve 48b
Is closed, and the first condenser 43 is brought into an operating state. The inside of the first condenser 43 has a structure in which the refrigerant flowing through the refrigeration cycle device 49 and the water circulating through the third water circulation path 40 flow through separate flow paths, and can exchange heat with each other. The refrigerant circulating in the refrigeration cycle device 49 evaporates and gasifies in the evaporator 45 to cool the freezing room and the refrigerator compartment 47. Then, the evaporated refrigerant exchanges heat with water circulating in the third water circulation path 40 in the first condenser 43 through the compressor 42 to give heat to the water.
This heat is stored in the heat storage tank 14.

When the temperature of the water circulating in the third water circulation path 40 becomes higher than the temperature of the air around the second condenser 44 which is the temperature in the installation space of the refrigerator, the first condenser 3 Exhaust heat cannot be recovered so much, and if the operation is continued as it is, the efficiency of the refrigeration cycle device 49 deteriorates, and a large amount of electric power is required. Therefore, the exhaust heat recovery operation is stopped, the electromagnetic valve 48a is closed, the electromagnetic valve 48b is opened, and the second condenser 44 is operated. As a result, the exhaust heat exchanges heat with the surrounding air and is radiated. However, the third water circulation path 40
The temperature of the water circulating through the first and second condensers 43 and 43 is detected.
Since the control of switching 44 is complicated, the switching may be performed in time. For example, in the morning when hot water is frequently used, cold storage is replenished in the heat storage tank 14 so that the heat storage of hot heat is required. From 8:00 to 4:00, the first condenser 43 is operated, and other times, from 4:00 to 8:00
The time may be switched in a fixed time such as being fixed to the second condenser 44. Even in this case, looking through the year,
A sufficient energy saving effect is obtained, and the control is simplified as compared with a configuration in which the water temperature is detected and switched.

As described above, the present embodiment is configured so that the exhaust heat of the refrigerator-freezer is used in the hot water supply system 12, and has the effect of recovering the normally discarded heat.
According to a trial calculation, the energy required to store a certain amount of heat in the heat storage tank 14 can be reduced by about 8% compared to a case where the exhaust heat is not recovered. Further, by exchanging heat between the cold water circulating in the third water circulation path 40 and the refrigerant circulating in the refrigeration cycle device 49, the temperature difference between the refrigerants can be reduced, so that the efficiency of the refrigeration cycle device 49 can be improved. Further, when the second condenser 44 is provided and the water temperature becomes higher than the surrounding air and the necessity of heat recovery is eliminated, the operation is switched to this and the exhaust heat recovery operation is stopped, so that the efficiency of the refrigeration cycle device 49 is improved. There is an effect that can prevent deterioration.

The heat storage tank 14 does not necessarily need to be filled with the latent heat storage material 15. The heat storage tank 14 is configured to store water, and the water is circulated through the first circulation path 10 to be heated so as to store heat. You may. However, heat storage tank 1
4 is filled with the latent heat storage material 15, it is possible to always obtain hot water having a constant temperature from the hot water supply port 16, and to use the water for showering or the like, it is possible to obtain comfortable hot water. In addition, when it is filled with the latent heat storage material 15,
The size of the hot water supply tank 14 can be reduced to, for example, about half the capacity as compared with the case where the inside of the heat storage tank 14 is filled only with water.

Further, both the water outlet and the water inlet of the third water circulation path 40 in the heat storage tank 14 are provided at the lower part, and the water in the heat storage tank 14 has a temperature distribution in which the upper water is warm and the lower water is cold. Can be. Therefore, the third
When the water outlet to the circulation path 40 is provided below, cool water can be circulated to the first condenser 43, and the efficiency of the refrigeration cycle device 49 can be further improved. Also, if the water inlet from the third circulation path 40 is provided above, convection occurs in the heat storage tank 14 and the warm water above mixes with the cold water below. On the other hand, in the present embodiment, since the water inlet is provided below, convection is prevented, and warm water is given to the cold water below, so that the collected waste heat can be efficiently used for hot water supply. Thus, an exhaust heat recovery system that can be efficiently used as an auxiliary heat source even if the amount of exhaust heat from the first condenser 43 is very small is obtained.

In the exhaust heat recovery system as shown in FIG. 5, for recovering the exhaust heat from the refrigerator, the tap water can be heated to about 30 ° C. When hot water having a higher temperature than this is to be obtained in the hot water supply system 12, a circulation path for circulating the water in the heat storage tank 14 may be formed, and the water may be heated by, for example, a gas.

FIG. 6 is a flowchart showing an example of operation control of the exhaust heat recovery system. Temperature stratification is formed inside the heat storage tank 14, and warm water is distributed at the upper part and cold water is distributed at the lower part. Since the amount of heat exhausted from the refrigerator per unit time is small, the cold water at the lower part of the heat storage tank 14 is circulated to the refrigerator side, and as an auxiliary heat source, the exhaust heat from the refrigerator is recovered and preheated to about 30 ° C. It is desirable to use. For example, in ST10, the circulating water temperature and room temperature below the heat storage tank 14 and the amount of cold water below the heat storage tank 14 are detected by the detection means. The means for detecting the temperature of the circulating water at the lower part of the heat storage tank 14 may be provided, for example, with a temperature sensor at the lower part of the heat storage tank 14 to detect the temperature of the circulating water at the lower part of the heat storage tank 14, or the third water circulation from the heat storage tank 14 The temperature of the circulating water may be detected by being provided at the outlet to the passage 40. To be precise, the room temperature is the temperature of the air taken in for exchanging heat in the second condenser 44. Here, the room temperature of the installation space is regarded as the same as the temperature of the space in which the refrigerator is installed. To detect. This can be detected by a temperature sensor provided in the installation space of the refrigerator or a temperature sensor provided on the side surface of the second condenser. As a detecting means for detecting the amount of chilled water in the heat storage tank 14, for example, there is a method of inserting one or more temperature sensors in a vertical direction in the heat storage tank 14 and detecting the amount of chilled water based on the detected temperature. Also,
The detecting means for detecting the amount of cold water in the heat storage tank 14 is not limited to this, and for example, a float made of a substance having an intermediate density between hot water and cold water inside the heat storage tank 14 may be sealed. There is a method of detecting the position by a magnetostrictive position detection sensor. In this method, if the position detection sensor is disposed in the heat storage tank 14, the float is positioned almost between the cold water and the hot water. The amount can be detected. However, in this case, it is assumed that the float emits a magnetic force such as a magnet.
Further, the magnetostrictive position detecting sensor may be mounted on the outer wall surface of the heat storage tank 14 when the heat storage tank 14 is not made of metal.

Next, in ST11, it is determined whether or not 10% of the entire tank lower water temperature <room temperature and lower tank cold water amount> is satisfied. If this condition is satisfied, the exhaust heat recovery operation of the refrigerator is performed in ST12, and if not, the process ends without performing the exhaust heat recovery operation of the refrigerator (END). This operation control is performed at regular time intervals, for example, 1
Run at minute intervals.

Since the refrigerant condensing side of the refrigerator is also cooled by the cold water circulating in the third water circulation path 40, the energy of the refrigerator itself is also saved. However, the effect of the waste heat recovery of the refrigerator cannot be expected unless the temperature of the circulating water is low. For this reason, a condition such as ST11 is provided, and when the tank lower water temperature ≧ room temperature, control is performed so that the exhaust heat recovery of the refrigerator in ST12 is not performed. Actually, when the water temperature at the lower part of the heat storage tank 14 is lower than room temperature, the heat radiation of the refrigerator is
As in the first condenser 43, which is a refrigerant heat exchanger, the refrigerant circuit of the refrigerator is connected by the solenoid valves 48a and 48b. The refrigerant circuit of the refrigerator is switched by the solenoid valves 48a and 48b as in the second condenser 44, which is a heat exchanger, and the blower of the second condenser 44 is operated to stop the exhaust heat recovery operation of the refrigerator.

The outlet for circulating water from the heat storage tank 14 is located at the bottom, so that the hot water in the heat storage tank 14 is not circulated to the refrigerator. When the hot water circulates to the refrigerator side, the condensation pressure in the first condenser 3 increases, and the cooling capacity in the evaporator 45 decreases. In order to prevent this, here, it is determined that the amount of cold water in the lower part of the tank <about 10% of the whole. That is, when the amount of cold water in the heat storage tank 14 becomes less than about 10% of the whole, the exhaust heat recovery operation of the refrigerator is stopped. Here, the operation of each device is changed to stop the exhaust heat recovery operation. In consideration of the operation delay of each device, when the amount of cold water falls to about 10% or less of the whole, the exhaust heat recovery is performed. The operation stops. For this reason, the third water circulation path 40
The hot water can be reliably prevented from flowing into the refrigerator, and a highly reliable exhaust heat recovery system can be obtained without lowering the operation efficiency of the refrigerator. Here, the amount of cold water in the heat storage tank 14 is detected because of the water circulating in the heat storage tank 14,
This is the amount of cold water to which sufficient heat is not supplied, for example, about 25 ° C. or less. As described above, the exhaust heat from the refrigerator-freezer that has been operating continuously for approximately 24 hours is used when the exhaust heat recovery operation is possible, that is, in ST11.
When the determination is YES, the exhaust heat can be used effectively by preheating the cold water under the heat storage tank 14.

Hereinafter, the calorific value of the refrigerator will be described.
The calorific value from the refrigerator can be easily calculated by equation (2). Since it is difficult to specify the load of the refrigerator, the power consumption of the refrigerator is treated as being proportional to the pressure ratio. Wra = Wref × ｛fps (Ttan + △ T2) -fps (Tref)｝ / ｛fps (Troom + △ T1) -fps (Tref)｝ (2) Troom, Tref: room temperature, refrigerator compartment temperature [° C.] Ttank : Temperature of cold water at lower part of heat storage tank [° C] △ T1: Temperature difference or logarithmic average temperature difference between air and refrigerant [de
g] ΔT2: Temperature difference or logarithmic average temperature difference between water and refrigerant [deg] Wra, Wref: Refrigerator power consumption [W], Refrigerator rated power consumption [W] fps (): Calculates refrigerant saturation pressure from temperature function

In this embodiment, the waste heat of the refrigerator represented by the formula (2) is recovered and can be used, for example, for preheating hot water. Further, also on the refrigerator side, when cold water is used on the refrigerant condensation side of the refrigerator, the heat exchange performance is better and the temperature is lower than when cooling with air, so that the refrigerant condensation pressure decreases. At this time, the evaporating pressure of the refrigerant also decreases, but the amount by which the condensing pressure decreases is greater, so the pressure ratio decreases. From this, it is possible to reduce power consumption by exchanging heat with cold water in the first condenser 43. Equation (2)
The power consumption of the refrigerator can be easily estimated by
Using this, for example, control may be constructed so that the power consumption of the refrigerator is minimized.

As shown in FIG. 7, when the refrigeration cycle apparatus 5 for hot water supply and the first water circulation path 10 as described in the first embodiment are provided and it is desired to obtain high-temperature hot water of about 30 ° C. or more, When the refrigeration cycle apparatus 5 is operated, hot water can be reliably supplied from the hot water supply port 16 at an arbitrary temperature. Specifically, a refrigeration cycle apparatus 5 and a first water circulation path 10 as shown in FIG. 7 are provided, and the refrigerant circulating in the refrigeration cycle apparatus 5 and the water circulating in the first water circulation path 10 exchange heat with the condenser 2. I do. At this time, the third water circulation path 40 serves as an auxiliary heat source that raises the lower cold water in the heat storage tank 14 by, for example, about several degrees Celsius. it can.

Further, as shown in FIG.
When the exhaust heat recovery function of the bathtub water is provided, a more efficient exhaust heat recovery system can be obtained. Hereinafter, an example of operation control of the exhaust heat recovery system according to the present embodiment will be described. FIG. 9 is a flowchart showing the procedure of the operation control of the exhaust heat recovery system shown in FIG. 8, and is a combination of FIG. 2 and FIG.

After the start (START), the temperature of the outside air and the temperature of the bath water are detected in ST1, and the heat storage tank 14 is detected in ST10.
The temperature of the lower circulation water and the room temperature are detected by a temperature sensor, and the amount of cold water in the heat storage tank 14 is detected. And
In ST11, it is determined whether or not 10% of the entire temperature of the lower part of the tank <room temperature and the amount of cold water in the lower part of the tank> is satisfied. If this condition is satisfied, the first condenser 43 is operated in ST12 to perform an exhaust heat recovery operation of the refrigerator, and if not, the exhaust heat recovery operation of the refrigerator is not performed. Is not performed. The refrigerator operates the second condenser 44 to perform a normal cooling operation. Next, in ST2, it is determined whether or not the heat storage amount of the heat storage tank 14 is full, and if it is full, the process ends (E
ND). If the amount of heat stored in the heat storage tank 14 is not yet full, it is determined in ST3 whether the time is in the midnight power time zone. When the time is not between 23:00 and 7:00, that is, except during the midnight power time zone, the operation ends without performing the exhaust heat recovery operation of the bathtub water and the normal heat storage operation (END).

If it is determined in ST3 that it is the midnight power time zone, it is determined in ST4 whether the time is a predetermined time, for example, between 1:00 and 6:00. Even in midnight power hours, 1
At times other than between 6:00 and 6:00, there is a possibility that the family may take a bath, and the normal heat storage operation is performed without performing the exhaust heat recovery operation of the bathtub water. Since the predetermined time varies depending on the family structure, life pattern, and the like, it is preferable that the predetermined time be variably set. Next, in ST5, the temperature of the bathtub water and the temperature of the outside air are compared. As a result of the comparison, when the temperature of the bath water is higher than the temperature of the outside air,
In ST6, the exhaust heat recovery operation of the bathtub water is performed. This is the refrigerant-
In this operation, the first heat exchanger 3, which is a water heat exchanger, is operated to recover heat from the bathtub water and store it in the heat storage tank 14 as hot water for hot water supply. When the temperature of the bath water is lower than the temperature of the outside air, a normal heat storage operation is performed in ST7. this is,
This is an operation in which the second heat exchanger 4, which is a refrigerant-air heat exchanger, is operated to absorb heat from outside air and boil. ST6, ST
At 7, the refrigerant circuit and the blower are brought into operation states corresponding to the respective operations, and the processing is terminated (END). This operation control is executed at fixed time intervals, for example, at one minute intervals.

By performing such operation control, when the temperature of the bathtub water is high, the exhaust heat of the bathtub water is recovered, and when the temperature of the bathtub water falls, the operation is switched to the normal heat storage operation. The operation efficiency of the cycle device 5 can be prevented from lowering. Further, since the power consumption in the refrigeration cycle device 5 is determined by the temperature difference between the temperature of the hot water to be heated and the temperature of the water below the heat storage tank 14, the temperature difference becomes small when the exhaust heat of the refrigerator is recovered, and Power consumption can be reduced accordingly. In addition, since the refrigerant condensing side of the refrigerator is also cooled by the cold water, the energy of the refrigerator itself can be saved.

In the above description, the temperature of the lower part of the heat storage tank 14 is detected, and the amount of cold water at the lower part of the heat storage tank 14 is detected. When the amount of cold water> 10% of the total is satisfied, the exhaust heat of the refrigerator is recovered. In order to make this determination, the detection of the water temperature in the lower part of the tank and the detection of the amount of cold water in the tank are detected by separate detecting means. The upper water temperature may be detected. When the temperature detected by the temperature detecting means is within a preset range of the chilled water temperature, the chilled water is at least 10% of the tank and the detected temperature is the temperature of the chilled water. For this reason, the detected cold water temperature is compared with the room temperature, and the control of the refrigerator exhaust heat recovery is performed according to the comparison result. When the detected temperature is higher than a preset chilled water temperature range, the amount of chilled water in the tank becomes one.
It can be detected that the temperature has fallen below a certain level, and refrigerator exhaust heat recovery is not performed. If the water temperature and the amount of cold water are detected by one detecting means, the number of detecting means can be reduced. At this time, in the determination of ST11, it is determined whether or not the detected water temperature is within the range of the cold water temperature, and if it is within the range of the cold water temperature, it is determined whether or not the water temperature is lower than room temperature. Exhaust heat recovery may be performed.

Further, a bypass circuit as described in the second embodiment may be provided in this, and a function for reheating bath water may be provided.

Further, in the present embodiment, the exhaust heat from the refrigerator-freezer is recovered to the hot water supply unit. However, the present invention may be applied to a cooling device including only a freezing room or only a refrigerator room. In addition, the present invention is not limited to use in a hot water supply unit, but can be applied to various other devices such as using recovered heat as a heat source of an air conditioner. Further, if the temperature zone of the hot water to be used can be arbitrarily set according to the purpose, a waste heat recovery system that can be used in various ways can be obtained.

In the above description, for example, a refrigerator was described as a cooling device. However, the same applies to a refrigerator only, a refrigerator only, or a large-sized one instead of a household one. Further, the cooling space is not limited to the closed type, and a similar effect can be obtained even if the cooling space is configured to recover the warm exhaust heat of a semi-closed type showcase or a refrigerated warehouse. Further, by providing in advance a first condenser 43 as a refrigerant-water condenser and a second condenser 44 as a refrigerant-air condenser as a cooling device, an exhaust heat recovery system as in the present embodiment can be easily provided. Can be configured. That is, hot water utilization means and a water circulation path for circulating the hot water utilization means are provided around the installation location of the cooling device having the first and second condensers 43 and 44, and the water circulation path and the water circulation part of the first condenser 43 are connected. If the connection is made, as in the present embodiment, the heat exhausted from the cooling device that has conventionally radiated heat into the air can be used in the necessary parts.

Embodiment 4 Hereinafter, an exhaust heat recovery system according to Embodiment 4 of the present invention will be described. FIG. 10 is a circuit configuration diagram showing the exhaust heat recovery system according to the present embodiment. The present embodiment relates to a system for recovering exhaust heat from a plurality of electric devices scattered in, for example, an apartment house. In the drawing, reference numeral 51 denotes a low-temperature heat recovery tank, which is filled with a liquid such as water, for example, in a heat insulating container, and exchanges heat with exhaust heat from a plurality of electric devices transported by a refrigerant. It has. In addition, hot drainage from multiple home tubs and pools
It is collected from the inflow port 52d into the low-temperature heat recovery tank 51 as it is. Reference numeral 53 denotes a refrigeration cycle device including a compressor 54, a condenser 5
5. Heat exchange unit 51 that exchanges heat with hot water in low-temperature heat recovery tank 51
c and the throttle means are connected by a refrigerant pipe to circulate the refrigerant. Reference numeral 56 denotes a fourth water circulation path, and water circulating in the fourth water circulation path is configured to flow around a capsule in which the latent heat storage material filled in the heat storage tank 57 is stored. Also, 5
Reference numeral 8 denotes a pump provided in the fourth water circulation path 56, and reference numeral 59 denotes a fifth water circulation path for supplying hot water. The heat of the tank 57 is used as hot water.

Exhausted heat from the household electrical appliances is transported by the refrigerant, and exchanges heat with the water in the low-temperature heat recovery tank 51 in the heat exchange units 52a and 52b.
Around 20 ° C. to 40 ° C., for example. In the vicinity of the inlet 52d, hot waste water of about 30 ° C. flows from a bathtub or a pool of each home. Especially in multi-family dwellings, the drainage from the bathtub of each house is usually collected by pipes, and in some cases there are common freezers and refrigerators. Can be collected in the low-temperature heat recovery tank 51 relatively easily.

Next, the operation when utilizing the heat stored in the low-temperature heat recovery tank 51 will be described. Here, for example, it is used to warm the water of the common pool. When the refrigeration cycle device 53 is operated, the refrigerant circulating therein evaporates in the heat exchange part 52 c of the low-temperature heat recovery tank 51, passes through the compressor 54, and is heated by the condenser 55 to the water circulating in the fourth water circulation path 56. give. Then, the heated water gives the latent heat storage material heat when flowing through the heat storage tank 57.
In the heat storage tank 57, the hot water from the fourth water circulation path 56 flows in above the heat storage tank 57, and gives heat to the latent heat storage material while flowing from above to below, and stores heat as the latent heat of the latent heat storage material. The cold water below the heat storage tank 57 is
The cycle of circulating through the water circulation path 56 and exchanging heat with the refrigerant of the refrigeration cycle device 53 is repeated. On the other hand, the heat storage tank 57 supplies the heat from the fifth circulation path 59. That is, the cold water from the fifth water circulation path 59 is used in the common pool 61. Then, the cold water from the common pool 61 circulates through the fifth water circulation path 59 and flows downward to be given heat by the latent heat storage material. The water in the common pool 61 becomes hot water of, for example, about 29 ° C. to 32 ° C. due to the heat stored in the heat storage tank 57.

As described above, in the present embodiment, exhaust heat from a plurality of electric devices is collected in the low-temperature heat recovery tank 51 and is used where heat is required. There is an effect that heat can be recovered. Furthermore, if the waste water used by the hot water utilization means is caused to flow into the low-temperature heat recovery tank 51, the heat can be used again, and a waste heat recovery system that can reuse waste heat without waste can be obtained.

Since the volume of water stored in the low-temperature heat recovery tank 51 is determined when the system is constructed, the inlet 52
It is configured to drain and replace only the amount of water flowing from d. However, in the low-temperature heat recovery tank 51, the amount of heat to be cooled in the heat exchange unit 52c and the heat exchange units 52a, 52b
If, for example, the amount of heat to be warmed is balanced to some extent on average for one day, it is not necessary to use the warm drainage from the inlet 52d. Therefore, in this case, it is not necessary to replace the water in the low-temperature heat recovery tank 51. Further, the inlet 52d
When not using the hot waste water from the low temperature heat recovery tank 51
It is not necessary to recover the heat with water, for example, it may be configured so that brine is filled and heat is exchanged with the brine by the heat exchange units 52a, 52b, 52c.

Further, by setting a time zone in which the heat storage operation of the heat storage tank 57 is performed and controlling the operation during the set time zone, it is possible to use a low-charge late-night power time zone or avoid a peak power time. The exhaust heat recovery system can be operated or operated in accordance with the use situation of the user, can obtain an energy-saving effect at low cost, and is easy to use.

Embodiment 5 Hereinafter, an exhaust heat recovery system according to Embodiment 5 will be described. In this embodiment,
In the fourth embodiment, as an electric device for recovering exhaust heat, for example, a common refrigerator in an apartment house is connected by piping,
In this method, waste heat from a refrigerator is used by using a low-temperature heat recovery tank. FIG. 11 shows a configuration of the exhaust heat recovery system according to the present embodiment. In the figure, 62 is a refrigerator system, 6
3 is an ice heat storage tank, 64 is a refrigerator compressor, 65 is an accumulator, 66a, 66b, and 66c are respectively throttle means, and especially 66b is a refrigerator throttle means, 67a, 67b, and 67.
c, 67d, 67e, 67f are solenoid valves which are means for opening and closing the refrigerant pipe, 68a, 68b are check valves, respectively.
69 is a refrigerator heat exchanger stored in the refrigerator, and 70 is a refrigerator main body. In this exhaust heat recovery system, operation patterns include a heat storage operation performed at night and a heat storage operation performed during the day. This refrigerator system 62 includes an ice storage tank 63.
The cold heat of 0 ° C. is stored in the ice heat storage tank 63,
Warm heat higher than 0 ° C., which is waste heat from the electric equipment, is stored in the low-temperature heat recovery tank 51 as latent heat.

Hereinafter, the heat storage operation will be described. The flow of the refrigerant in this operation is indicated by solid arrows. Refrigerator system 62
In the above, cold heat for cooling is stored in the ice heat storage tank 63 at night. That is, the solenoid valves 67a, 67c, 67d, 67
f is opened and the solenoid valves 67b and 67e are closed. Then, the refrigerator compressor 64 → the heat exchange section 52a → the solenoid valve 67d → the check valve 68a → the throttle means 66c → the ice heat storage tank 63 → the solenoid valve 6
7f → constitute a refrigerant circulation circuit of the accumulator 65,
By using the heat exchanging section 52a as a condenser and the ice heat storage tank 63 as an evaporator, cold heat is stored in the ice heat storage tank 63. The warm exhaust heat when performing the ice heat storage is radiated to the low-temperature heat recovery tank 51 by the heat exchange section 52a and collected. If a refrigeration / refrigeration load occurs in the refrigerator body 70 during the heat storage operation, the cooling operation is performed simultaneously. At this time, the compressor 64 for the refrigerator → the heat exchange section 52a → the solenoid valves 67d and 67c → the throttle means 66b → the heat exchanger 69 → the solenoid valve 67a → the throttle means 6
6a → constitute a refrigerant circulation circuit of the accumulator 65,
The cooling space of the refrigerator main body 70 is cooled by using the heat exchanger 52a as a condenser and the heat exchanger 69 as an evaporator. The heat exhausted when the refrigerator is cooled is supplied to the heat exchanging section 52.
The heat is released to the low-temperature heat recovery tank 51 in FIG. Normally, the heat storage operation is controlled to be performed, for example, at night, which is a late-night power time zone. Do. In addition, when no refrigeration / refrigeration load is generated, by closing the solenoid valve 67c, the refrigerant circuit for cooling the refrigerator is closed, and a circuit for performing only the heat storage operation is configured. Further, the heat stored in the low-temperature heat recovery tank 51 is stored in the heat storage tank 57 by the refrigeration cycle device 53 at night,
It is used as a heat source for heating pools and hot water tanks during the day.

In the heat storage utilization operation, the refrigerator heats the refrigerator or the freezer by utilizing the cold stored in the ice heat storage tank 63 for supercooling. The flow of the refrigerant in this operation is indicated by a dotted arrow. That is, the solenoid valves 67b, 67c, 67e are opened and the solenoid valves 67
a, 67d, and 67f are closed. Then, the refrigerator compressor 64 → the heat exchange section 52a → the solenoid valve 67e → the ice heat storage tank 63
→ A check valve 68b → a solenoid valve 67c → a throttle means 66b → a heat exchanger 69 → a solenoid valve 67b → constitute a refrigerant circulation circuit of the accumulator 65. The refrigerant which has become high temperature and high pressure in the compressor 64 is condensed and cooled in the heat exchange section 52a to become hot water of about 50 ° C., and is further cooled to about 30 ° C. by melting ice in the ice heat storage tank 63. Then, -5 is obtained by the aperture means 66b.
° C, and evaporates in the heat exchanger 69 to give cold to the refrigerator. Thus, the cooling space in the refrigerator main body 70 is cooled by using the heat exchange part 52a as a condenser, the ice heat storage tank 63 as a supercooling heat exchanger, and the heat exchanger 69 as an evaporator.

In the configuration according to the present embodiment, the ice heat storage tank 6
By using the cold energy of 3 as a subcooling heat exchanger,
Refrigeration and freezing can be performed more efficiently. Further, the warm exhaust heat when cooling the refrigerator is radiated to the low-temperature heat recovery tank 51 by the heat exchange section 52a and collected. Further, this warm exhaust heat is stored in the heat storage tank 57 as described in the fourth embodiment, circulated and taken out of the water in the fifth water circulation path 59, and used as a heat source for heating the pool and the hot water tank. And
The system constitutes an exhaust heat recovery system that can utilize energy without waste.

Hereinafter, an example of operation control of the exhaust heat recovery system according to the present embodiment will be described. FIG. 12 is a flowchart showing a procedure of operation control of the exhaust heat recovery system. First, after the control is started (START), in ST21, the water temperature of the pool 61, the pool drainage amount, the heat storage amount of the heat storage tank 57, and the heat storage amount of the ice heat storage tank 63 are detected. The means for detecting the water temperature of the pool 61 is detected by, for example, a temperature sensor provided in the pool. The means for detecting the pool drainage amount may be provided by providing a flowmeter in the middle of the water distribution pipe for detection, or may use an estimated value based on the time from the start of drainage. Thermal storage tank 5
As described in the third embodiment, the heat storage amount of No. 7 can be detected by a temperature sensor for detecting the temperature in the heat storage tank 57, a float made of a substance having a density between hot water and cold water, and a magnetostrictive position detection sensor. The detecting means for detecting the amount of heat stored in the ice heat storage tank 63 can be detected by a temperature sensor for detecting the temperature of the water in the ice heat storage tank 63 or a water level sensor for detecting the water level in the ice heat storage tank 63.

In ST22 and ST23, the replacement water of the pool is stored in the low-temperature heat recovery tank 51 at 21:00 to 23:00, and the warm drainage from the bathtub is drained at any time for 24 hours.
The water is stored. At this time, for example, when the pool is replaced, new water is replaced by about 10% of the whole day. This is because if the water is not replaced, it is unsanitary, and if the water in the entire pool is replaced every day, a large amount of heat is required to heat the tap water and heat the pool water and keep it warm. Low temperature heat recovery tank 51
In, the drainage amount equivalent to the new water storage amount is drained from the lower part of the tank, and is controlled so that the water is replaced.
Further, the drainage time zone of the pool is set from 21:00 to 23:00 during the midnight power time zone from 23:00, and it is desirable to perform the heating or heat-retaining operation according to the pool water temperature. This is to complete the replacement of water. This time zone is not limited to 21:00 to 23:00,
What is necessary is just to set according to the situation of each system.

In ST24 and ST25, the heat stored in the ice heat storage tank 63 used for cooling the refrigerator or the freezer is 23
It is done during the midnight power hours between the hours
The heat storage operation is performed until is fully charged. In the meantime,
When a refrigeration load occurs, the cooling operation is performed simultaneously with the heat storage operation to cool the cooling space in the refrigerator main body 70.
In ST26, when a refrigeration / refrigeration load occurs during the daytime, which is not the midnight power time zone, the cold stored in the ice heat storage tank 63 by performing the heat storage operation is used by the heat exchanger 69 for refrigeration / refrigeration. In ST27 and ST28, the heat recovery from the low-temperature heat recovery tank 51 and the heat storage in the heat storage tank 57 by the refrigeration cycle device 53 are also performed during the midnight power hours between 23:00 and 7:00. Then, when the heat storage tank 57 becomes full, the heating operation is performed using the heat of the heat storage tank 57 until the pool water temperature reaches the set temperature in ST29 and ST30. This operation control is executed at fixed time intervals, for example, at one minute intervals.

As described above, by storing warm heat in the heat storage tank 57 and storing cold heat in the ice heat storage tank 63, waste heat at various temperatures can be collected and stored, and waste heat can be utilized without waste. A recovery system is obtained. In addition, a time zone in which the heat storage operation is performed in the heat storage tank 57 and the ice heat storage tank 63 is set, and the operation is controlled so as to operate in the set time zone. An easy-to-use exhaust heat recovery system that can be operated at a time when there is little CO ₂ emission, or can be operated according to the use situation of the user, and can save energy at low cost. Is obtained.

Embodiment 6 FIG. Hereinafter, an exhaust heat recovery system according to Embodiment 6 will be described. FIG. 13 shows the configuration of the exhaust heat recovery system according to the present embodiment. In the figure, 71 is a compressor, 72 is a heat exchanger, 73 is a throttle means,
74 is an ice heat storage tank, 75 is a latent heat storage tank, 76 is a thermal load,
77 is a cooling load.

A refrigeration cycle apparatus is constructed by connecting a compressor 71, a heat exchanger 72 operating as a condenser, a throttle means 73, and an ice heat storage tank 74 operating as an evaporator by piping. Water is stored in the ice heat storage tank 74 as a latent heat storage material, and a refrigerant pipe constituting the refrigeration cycle device passes through the water in the ice heat storage tank 74. The cold heat obtained by evaporating the refrigerant while passing through the refrigerant pipe is transferred to the ice heat storage tank 74.
The water inside solidifies on ice below 0 ° C and is stored as latent heat. In the cooling load 77, for example, when cold heat such as cooling is required, the ice in the ice heat storage tank 74 is thawed,
Use that cold heat. Further, the heat exchanger 72 operating as a condenser is configured to exchange heat between the heat medium circulating in the latent heat storage tank 75 and the refrigerant circulating in the refrigeration cycle device. Latent heat storage tank 7 through
Store heat in 5. The latent heat storage material stored in the latent heat storage tank 75 is solidified at a predetermined temperature of 0 ° C. or higher and stores warm heat as latent heat. The temperature of the stored heat is determined by the material used as the latent heat storage material. For example, when the latent heat storage material uses calcium chloride hexahydrate, heat of about 30 ° C. can be stored, and when sodium acetate is used, heat of about 40 ° C. can be stored. And the thermal load 7
In the case of 6, when heating such as heating or hot water is required,
Heat is taken out from the latent heat storage tank 75 and used. FIG.
In the exhaust heat recovery system having the configuration shown in FIG.
Is not included in the refrigeration cycle apparatus, but the ice heat storage tank 74 is included in the refrigeration cycle apparatus. By using the ice heat storage tank 74 capable of storing the cold heat of 0 ° C. as described above,
One of the ice heat storage tanks 74 can also serve as a heat exchanger that operates as an evaporator and a latent heat storage tank, and the configuration is simplified. Further, the latent heat storage material of the ice heat storage tank 74 is water, which can be realized with a safe and inexpensive latent heat storage material.

In FIG. 13, the heat storage tank for cold heat is provided in the refrigeration cycle apparatus, but the heat storage tank for cold heat is provided outside the refrigeration cycle apparatus, and the heat storage tank for warm heat is provided in the refrigeration cycle apparatus. May be provided. Further, both latent heat storage tanks may be provided outside the refrigeration cycle apparatus, or both latent heat storage tanks may be provided inside the refrigeration cycle apparatus. At least a configuration that exchanges heat with the first and second heat exchangers constituting the refrigeration cycle device may be used.

In FIG. 13, since the temperature of the heat stored in the latent heat storage tank 75 differs depending on the latent heat storage material stored in the latent heat storage tank 75, any necessary heat load may be used for the heat load 76. For example, when the latent heat storage material is sodium acetate, heat can be stored at a temperature of about 40 ° C., and in aluminum alum, the heat can be stored at a temperature of about 90 ° C. The heat medium that circulates through the latent heat storage tank 75 and exchanges heat with the refrigerant in the heat exchanger 72 is a medium that circulates and transports heat, and in the case of the configuration shown in FIG. 13, water may be used. , Or brine.

In the present embodiment, a material that changes latent heat at a low temperature, such as ice heat storage, is used on the evaporation side. As a latent heat storage material, sodium acetate or the like that changes latent heat at a medium temperature of about 40 ° C. may be used. preferable. In the case where a higher temperature is to be stored, for example, when aluminum alum that changes latent heat at a high temperature of about 90 ° C. is used on the condensation side as a latent heat storage material of the latent heat storage tank 75, for example, as shown in FIG. It is necessary to raise the temperature of the heat supplied to the latent heat storage tank 75 on the side. In FIG. 14, a refrigerant is circulated by connecting a compressor 78, a heat exchanger 79, a throttle means 80, and a heat exchanger 72 with piping, and the heat exchanger 72 operates as an evaporator and the heat exchanger 79 operates as a condenser. Then, the temperature of about 40 ° C. can be increased to about 90 ° C. Further, if the exhaust heat recovery system is configured as shown in FIG. 14, the temperature of the heat supplied to the latent heat storage tank 75 can be controlled to be constant, and efficient heat storage can be performed.

As shown in FIG. 15, a heat exchanger 72b operating as an evaporator is provided instead of the ice heat storage tank 74.
A latent heat storage tank 74 having a latent heat storage material may be provided to store cold heat therein. In the exhaust heat recovery system shown in FIG. 15, the compressor 71, the first heat exchanger 72a, the throttling unit 7
3. The second heat exchanger 72b is connected by a pipe, and a refrigerant is circulated to constitute a refrigeration cycle apparatus. First heat exchanger 72a
Represents the refrigerant circulating in the refrigeration cycle device and the first latent heat storage tank 7
5 and the first heat medium circulating through the heat exchanger. The second heat exchanger 72b is configured to exchange heat between the refrigerant circulating in the refrigeration cycle device and the second heat medium circulating in the second latent heat storage tank 74. For example, when the refrigeration cycle apparatus is operated by operating the first heat exchanger 72a as a condenser and the second heat exchanger 72b as an evaporator, the refrigerant becomes first refrigerant.
The heat generated when the heat is condensed in the heat exchanger 72a is stored in the first latent heat storage tank 7.
5 and the cold heat generated when the refrigerant evaporates in the second heat exchanger 72b is stored in the second latent heat storage tank 74. The latent heat storage material of the first latent heat storage tank 75 where heat is stored is solidified and stored at a temperature equal to or higher than the first temperature, and the latent heat storage material of the second latent heat storage tank 74 where cold heat is stored. Is solidified at a temperature equal to or lower than the second temperature and stored. The first temperature and the second temperature are different from each other, and the first temperature stored in the latent heat storage tank on the condenser side is higher than the second temperature stored in the latent heat storage tank on the condenser side. It is necessary to configure the latent heat storage material so that the temperature becomes high. For example, when sodium acetate is used as the latent heat storage material of the first latent heat storage tank 75, about 40 ° C. is stored, and when aluminum alum is used, about 90 ° C., the latent heat is stored. About -5 ° C when potassium bicarbonate is used for the material, -20 when sodium chloride is used
Cold heat of about ° C is stored. However, the present invention is not limited to this, and other latent heat storage materials may be used as the first and second latent heat storage materials. The temperature at which heat is stored is not limited to the above, and high-temperature heat of 90 ° C. or more or low-temperature cold heat of −20 ° C. or less may be stored. The first heat medium is a medium that circulates and transports hot heat, and the second heat medium is a medium that circulates and transports cold heat, and may be water, brine, or the like. The first and second heat carriers may use the same substance or different substances.

As described above, the latent heat storage tank for storing hot heat on the condenser side and the heat storage tank for storing cold heat on the evaporator side are provided. Is stored, when the thermal load 76 occurs, the latent heat storage material of the latent heat storage tank 75 that stores the heated heat can be taken out and used while liquefying the latent heat storage material.
When the cold load 77 is generated, the cold heat can be taken out and used while liquefying the latent heat storage material of the latent heat storage tank 74 storing the cold heat.

Further, in the exhaust heat recovery system having the structure shown in FIG. 15, the first latent heat storage tank 75 and the second latent heat storage tank 74 are provided.
Is not a configuration included in the refrigeration cycle apparatus, but the first and second heat exchangers 72a and 72b constituting the refrigeration cycle apparatus.
Since it is configured to be able to exchange heat with, it can be applied to various systems and has high versatility. For example, the latent heat storage material can be selected according to the convenience of the user, and even after the system is constructed, the heat storage temperature can be changed by changing the latent heat storage material without changing the refrigeration cycle device. First,
Since the second latent heat storage tanks 75 and 74 are not included in the refrigeration cycle apparatus, the first and second latent heat storage tanks 7 when installed are not provided.
The workability of the refrigeration cycle apparatus and the refrigeration cycle apparatus is good, and the maintenance and inspection of the first and second latent heat storage tanks 75 and 74 are also easy.

In the waste heat recovery system according to the present embodiment shown in FIGS. 13 to 15, the warm waste heat of one refrigeration cycle device is recovered in the latent heat storage tank 75, and the cold waste heat is stored in the latent heat storage tank 74. In the case of recovery, it can be recovered and stored in separate latent heat storage materials. That is, exhaust heat at different temperatures can be collected and stored, and an exhaust heat recovery system that can utilize energy without waste can be obtained.

In the present embodiment, the heating load and the cooling load can be generated simultaneously or separately.

In the heat exchangers according to Embodiments 1 to 5, one in which one fluid flows in through a pipe and exchanges heat with the other fluid flowing around or stagnating around the pipe, for example, a refrigerant -As the air heat exchanger, a plate fin tube heat exchanger or the like can be used, but is not limited thereto. In the heat exchangers according to the first to sixth embodiments, two fluids flow in respective pipes and exchange heat, for example, a refrigerant-water heat exchanger and a water-water heat exchanger are plate-type heat exchangers. A heat exchanger or a double tube heat exchanger can be used, but is not limited thereto.

[0105]

As described above, according to the present invention, a heat storage tank through which water flows around a latent heat storage material filled therein,
Means for using hot water stored in the heat storage tank as hot water; a compressor; a condenser for heat exchange with water circulating in the heat storage tank; a first heat exchanger for heat exchange with bathtub water; A second heat exchanger connected in parallel with the exchanger and exchanging heat with the outside air; and a refrigeration cycle device forming a refrigerant circuit by connecting a throttle means with a pipe, and operating the first heat exchanger to form the bathtub The refrigerant circuit can be switched between an exhaust heat recovery operation that recovers the heat of water and stores the heat in the heat storage tank and a heat storage operation that operates the second heat exchanger to store the heat absorbed from the outside air in the heat storage tank. As a result, the waste heat of the bathtub, which is normally discarded, can be recovered and reused, and a waste heat recovery system that saves energy can be obtained.

Further, according to the present invention, the compressor, the condenser for exchanging heat with water circulating in the heat storage tank, the first heat exchanger for exchanging heat with bathtub water, and the outside air connected to the first heat exchanger in parallel with the heat A second heat exchanger to be exchanged, and a throttling means are connected by a pipe to form a refrigerant circuit, and a refrigerant discharged from the compressor is supplied to the first heat exchanger by the first heat exchanger.
A refrigeration cycle device having a first bypass circuit for flowing into the heat exchanger; and hot water utilization means for utilizing the heat stored in the heat storage tank as hot water, wherein the compressor, the condenser, and the first heat exchange are provided. A refrigerant circuit for performing an exhaust heat recovery operation by operating a first heat exchanger as an evaporator and connecting the compressor, a first bypass circuit, a first heat exchanger, and a second heat exchanger. Since the first heat exchanger is operated as a condenser and the second heat exchanger is operated as an evaporator to switch between a refrigerant circuit for supplying heat to the bath water, the temperature of the bath water is discharged. An exhaust heat recovery system capable of recovering and reusing heat and warming bath water is obtained.

Further, according to the present invention, the compressor, the condenser for exchanging heat with water circulating in the heat storage tank, the first heat exchanger for exchanging heat with bathtub water, the outside air connected in parallel with the first heat exchanger, and the heat A second heat exchanger to be exchanged and a throttling means are connected by a pipe to form a refrigerant circuit, and a refrigerant discharged from the compressor is supplied to a second heat exchanger.
A refrigeration cycle device having a second bypass circuit for flowing into the heat exchanger; and hot water using means for using the heat stored in the heat storage tank as hot water, wherein the compressor, the condenser, and the first heat exchanger are provided. A refrigerant circuit for performing exhaust heat recovery operation by connecting the first heat exchanger as an evaporator and connecting the first heat exchanger to the compressor, the second bypass circuit, the second heat exchanger, and the first heat exchanger or another heat exchanger. The evaporator is connected to operate the second heat exchanger as a condenser, and the refrigerant circuit is configured to operate the first heat exchanger or the another evaporator as an evaporator. An exhaust heat recovery system that can be recovered and reused and that can be expanded in various ways, such as cooling the bath water to control the temperature or adding an air conditioning unit to perform cooling, can be obtained.

Further, according to the present invention, the first temperature detecting means for detecting the temperature of the outside air and the second temperature detecting means for detecting the temperature of the bath water are provided, and the outside air detected by the first and second temperature detecting means is provided. The temperature of the bathtub is compared with the temperature of the bathtub water, and the operation of the first heat exchanger and the operation of the second heat exchanger are switched in accordance with the result of the comparison. In such a case, the exhaust heat recovery from the bathtub water can be stopped, and an exhaust heat recovery system that can prevent a decrease in the operation efficiency of the refrigeration cycle apparatus can be obtained.

Further, according to the present invention, the compressor, the evaporator for supplying cold heat to the cooling space, the first condenser for exchanging heat with water circulating in the heat storage tank, and the first condenser being connected in parallel with the first condenser for exchanging heat with air. A cooling device that forms a refrigerant circuit by connecting a second condenser and a throttling means by piping, and hot water utilization means that uses the heat stored in the heat storage tank as hot water to operate the first condenser. Since the refrigerant circuit can be switched between an exhaust heat recovery operation in which the exhaust heat generated by supplying the cold heat is stored in the heat storage tank and a heat radiation operation in which the second condenser is operated to release heat to the surrounding air. Thus, an exhaust heat recovery system that can recover and reuse the exhaust heat from the cooling device can be obtained.

Further, the present invention comprises third temperature detecting means for detecting the temperature of the air before heat exchange in the second condenser and fourth temperature detecting means for detecting the temperature of the water circulating in the heat storage tank. The temperature of the air detected by the third and fourth temperature detecting means is compared with the temperature of the circulating water, and the operation of the first condenser and the operation of the second condenser are switched according to the comparison result. Therefore, when the temperature of the water circulating in the heat storage tank becomes higher than the temperature of the air, it is possible to stop the recovery of the exhaust heat from the cooling device, thereby preventing a decrease in the operating efficiency of the refrigeration cycle constituting the cooling device. A possible waste heat recovery system is obtained. In addition, by exchanging heat with low-temperature water circulating in the heat storage tank, there is an effect that energy of the cooling device can be saved.

Further, according to the present invention, there is provided water amount detecting means for detecting the amount of cold water to which sufficient heat is not supplied from the water circulating in the heat storage tank. When the amount is equal to or less than a predetermined amount, the second condenser is operated to perform a heat radiation operation of releasing the air to the surrounding air.
High-temperature water can be reliably prevented from flowing into the first condenser from the heat storage tank, and a highly reliable exhaust heat recovery system can be obtained without lowering the operation efficiency of the cooling device.

Further, according to the present invention, since the water below the heat storage tank is taken out and heat-exchanged with the first condenser to make hot water, and the water circulation path for returning the hot water below the heat storage tank is provided, the cooling device is used. An exhaust heat recovery system that can be efficiently used as an auxiliary heat source even if the amount of exhaust heat is small is obtained.

Further, in the present invention, since the cooling device is a refrigerator or a freezer, an exhaust heat recovery system capable of recovering and reusing the exhaust heat from the refrigerator or the freezer that normally operates continuously for 24 hours is obtained.

Further, according to the present invention, there is provided a low-temperature heat recovery tank for storing a liquid which has exchanged heat with the exhaust heat of a plurality of electric devices, a compressor, a condenser for exchanging heat with water circulating in the heat storage tank, and the low-temperature heat recovery tank. A refrigerating cycle device that forms a refrigerant circuit by connecting an evaporator that exchanges heat with the liquid in the tank via a pipe, and hot water utilization means that uses the heat stored in the heat storage tank as hot water are provided. An exhaust heat recovery system capable of recovering and reusing exhaust heat from the used electric equipment can be obtained.

Further, in the present invention, the waste heat used by the hot water utilization means is allowed to flow into the low-temperature heat recovery tank, so that the heat can be reused and the waste heat can be reused without waste. Is obtained.

Further, in the present invention, at least one electric device is connected by a pipe to a compressor for the electric device, a heat exchange section for exchanging heat with the low-temperature heat recovery tank, a throttle means for the electric device, and an evaporator for the electric device. The refrigerant is circulated, and the cold heat obtained by the electric equipment evaporator is used for cooling.The ice heat storage tank is further provided, and the ice heat storage tank is cooled as the evaporator while the electric equipment evaporator is cooled. Operating the heat storage unit to store cold energy therein, operating the heat exchange unit that exchanges heat with the low-temperature heat recovery tank as a condenser, and operating the ice heat storage tank as a supercooling heat exchanger that supercools the refrigerant. It is configured to be able to switch between a heat storage use operation that supplies cold heat to the evaporator for electric equipment, so that it is possible to use the heat and also to store the cold heat and use it for cooling, so that the waste heat can be used efficiently without waste. Shi Temu is obtained.

Further, according to the present invention, a time zone for storing heat in the heat storage tank is set, and control is performed such that heat is stored in the heat storage tank in this time zone.
It is possible to operate while avoiding power peaks, to reduce the amount of CO ₂ emission, and to operate according to the usage conditions of the user, and to obtain a user-friendly exhaust heat recovery system.

Further, in the present invention, since the latent heat storage material is filled in the heat storage tank and water is circulated around the heat storage tank, an exhaust heat recovery system capable of reducing the size of the heat storage tank can be obtained. effective.

Further, according to the present invention, the compressor, the first heat exchanger, the throttling means, and the second heat exchanger are connected by pipes, and the refrigerant is circulated by the refrigeration cycle apparatus. A first latent heat storage tank having a first latent heat storage material for exchanging and storing heat at a first temperature; and a second heat exchanger having a second temperature different from the first temperature by exchanging heat with a refrigerant in a second heat exchanger. A second latent heat storage tank having a second latent heat storage material for storing heat, wherein one of the first and second heat exchangers is operated as an evaporator to exchange heat therewith. Cold heat is stored in the tank, and the other heat exchanger is operated as a condenser, and heat is stored in the latent heat storage tank that exchanges heat with it. Therefore, heat storage at at least two different temperatures can be realized, and energy is used without waste. A possible waste heat recovery system is obtained.

In the present invention, of the first and second latent heat storage materials, the latent heat storage material that stores heat is solidified and stored at a temperature higher than the temperature at which it is stored, and the latent heat storage material that stores cold heat is used. Since the heat storage material is solidified and stored at a temperature lower than the temperature at which heat is stored, heat storage at at least two different temperatures can be realized, and an exhaust heat recovery system that can utilize energy without waste can be obtained.

In the present invention, since at least one of the first and second latent heat storage tanks is configured such that the piping constituting the refrigeration cycle device passes through the inside thereof, the structure is relatively low. An easy-to-use exhaust heat recovery system is obtained.

In the present invention, of the first and second latent heat storage tanks, the latent heat storage tank for storing heat is for storing heat at a temperature higher than 0 ° C., and the latent heat storage tank for storing cold heat. Is an ice heat storage tank that stores cold heat of 0 ° C., so that it can be realized relatively easily, and an exhaust heat recovery system having a latent heat storage tank that is inexpensive and easy to handle can be obtained.

Further, according to the present invention, since the heat or cold stored in at least one of the first and second latent heat storage tanks is used for the heat load or the cold load, It is possible to obtain a waste heat recovery system that can effectively use the waste heat and the cold waste heat that have been wasted.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram showing an exhaust heat recovery system according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure of operation control of the exhaust heat recovery system according to the first embodiment.

FIG. 3 is a circuit configuration diagram showing an exhaust heat recovery system according to a second embodiment of the present invention.

FIG. 4 is a circuit configuration diagram illustrating an exhaust heat recovery system according to another configuration of the second embodiment.

FIG. 5 is a circuit configuration diagram showing an exhaust heat recovery system according to Embodiment 3 of the present invention.

FIG. 6 is a flowchart showing a procedure of operation control of the exhaust heat recovery system according to the third embodiment.

FIG. 7 is a circuit configuration diagram illustrating an exhaust heat recovery system according to another configuration of the third embodiment.

FIG. 8 is a circuit configuration diagram showing an exhaust heat recovery system according to still another configuration of the third embodiment.

FIG. 9 is a flowchart showing a procedure of operation control of the exhaust heat recovery system according to the third embodiment.

FIG. 10 is a circuit configuration diagram showing an exhaust heat recovery system according to Embodiment 4 of the present invention.

FIG. 11 is a circuit configuration diagram showing an exhaust heat recovery system according to a fifth embodiment of the present invention.

FIG. 12 is a flowchart showing a procedure of operation control of the exhaust heat recovery system according to the fifth embodiment.

FIG. 13 is a circuit configuration diagram showing an exhaust heat recovery system according to Embodiment 6 of the present invention.

FIG. 14 is a circuit configuration diagram showing an exhaust heat recovery system according to another example of the sixth embodiment.

FIG. 15 is a circuit diagram showing an exhaust heat recovery system according to still another example of the sixth embodiment.

FIG. 16 is an explanatory diagram showing a flow of thermal energy in a general living space.

FIG. 17 shows a conventional hot water supply unit (FIG. 17 (a)), a bathtub (FIG. 17 (b)), a refrigerator / freezer (FIG. 17 (c)), and a cooling / heating air conditioner (FIG. 17) used in ordinary households.
It is a lineblock diagram showing (d)).

FIG. 18 is a schematic configuration diagram showing a conventional hot water supply apparatus for recovering use of hot waste water.

FIG. 19 is a configuration diagram illustrating a refrigeration cycle apparatus including a conventional ice heat storage tank.

[Explanation of symbols]

1 compressor, 2 condenser, 3rd heat exchanger, 4th
Heat exchanger, 5 refrigeration cycle device, 6a, 6b pipe opening / closing means, 7a, 7b throttle means, 10 water circulation path, 12
Hot water supply unit, 13 city water inlet, 14 heat storage tank, 1
5 latent heat storage material, 16 hot water supply port, 20 water circulation path, 22
Bathtub, 31 first bypass circuit, 31a, 31b piping opening / closing means, 32 second bypass circuit, 32a, 32b
Piping opening / closing means, 33 Piping opening / closing means, 34 Heat exchanger, 35a, 35b, 35c Piping opening / closing means, 36 Throttle means, 40 Water circulation path, 42 Compressor, 43 First condenser, 44 Second condenser, 45 Evaporator , 46 throttling means, 47 cooling space, 48a, 48b pipe opening and closing means,
49 Refrigeration cycle device for cooling system, 51 Low-temperature heat recovery tank, 52a, 52b, 52c Heat exchange section, 52d inlet, 53 Refrigeration cycle device, 54 Compressor, 55 Condenser, 56 Water circulation path, 57 Heat storage tank, 59 Water circulation Road,
61 hot water utilization means, 62 refrigerator system, 63 ice heat storage tank, 64 compressor for electric equipment, 66b throttle means for electric equipment, 69 evaporator for electric equipment, 71 compressor, 7
2, 72a, 72b Heat exchanger, 74, 75 Latent heat storage tank, 76 Heat load, 77 Cold load.

Claims (19)

[Claims] 1. A heat storage tank through which water circulates around a latent heat storage material filled therein, hot water using means for using the heat stored in the heat storage tank as hot water, a compressor, and a circulating compressor. A condenser that exchanges heat with water to be exchanged, a first heat exchanger that exchanges heat with bathtub water, a second heat exchanger that is connected in parallel with the first heat exchanger and exchanges heat with the outside air, and a throttling means. A refrigeration cycle device that constitutes a refrigerant circuit by operating the first heat exchanger to recover the heat of the bathtub water and store the heat in the heat storage tank, and to operate the second heat exchanger. An exhaust heat recovery system wherein a refrigerant circuit can be switched between a heat storage operation for storing heat absorbed from outside air and heat stored in the heat storage tank. 2. A compressor, a condenser for heat exchange with water circulating in a heat storage tank, a first heat exchanger for heat exchange with bathtub water, and a second heat exchanger connected in parallel with the first heat exchanger for heat exchange with outside air. Heat exchanger,
And a refrigeration cycle device having a first bypass circuit for connecting a refrigerant discharged from the compressor to the first heat exchanger by connecting a refrigerant circuit by connecting the expansion means with a pipe, and the heat stored in the heat storage tank. And a refrigerant circuit that connects the compressor, the condenser, and the first heat exchanger, and operates the first heat exchanger as an evaporator to perform an exhaust heat recovery operation. Connecting the compressor, the first bypass circuit, the first heat exchanger, and the second heat exchanger, operating the first heat exchanger as a condenser, and operating the second heat exchanger as an evaporator. An exhaust heat recovery system characterized in that it is configured to switch between a refrigerant circuit that performs an operation of supplying heat to bathtub water. 3. A compressor, a condenser for heat exchange with water circulating in the heat storage tank, a first heat exchanger for heat exchange with bathtub water, and a second heat exchanger connected in parallel with the first heat exchanger for heat exchange with outside air. Heat exchanger,
A refrigeration cycle apparatus having a second bypass circuit for connecting a refrigerant discharged from the compressor to a second heat exchanger by connecting a refrigerant circuit by connecting a pipe and a throttling means, and the heat stored in the heat storage tank. And a refrigerant circuit that connects the compressor, the condenser, and the first heat exchanger, and operates the first heat exchanger as an evaporator to perform an exhaust heat recovery operation. Connecting the compressor, the second bypass circuit, the second heat exchanger, and the first heat exchanger or another evaporator to operate the second heat exchanger as a condenser and to operate the first heat exchanger or the first heat exchanger. An exhaust heat recovery system comprising a refrigerant circuit that operates another evaporator as an evaporator. And a first temperature detecting means for detecting a temperature of the outside air and a second temperature detecting means for detecting a temperature of the bathtub water.
The temperature of the outside air detected by the first and second temperature detecting means is compared with the temperature of the bathtub water, and the operation of the first heat exchanger and the operation of the second heat exchanger are switched according to the comparison result. Claim 1 or Claim 2 or Claim 3 characterized by the above-mentioned.
Exhaust heat recovery system as described. 5. A compressor, an evaporator for supplying cold heat to a cooling space, a first condenser for exchanging heat with water circulating in a heat storage tank,
A second condenser connected in parallel with the condenser and exchanging heat with air;
And a cooling device that forms a refrigerant circuit by connecting the expansion means with piping, and hot water utilization means that uses the heat stored in the heat storage tank as hot water, and operates the first condenser to supply the cold heat. A heat recovery operation for storing heat generated by the heat storage in the heat storage tank and a heat radiation operation for operating the second condenser to radiate heat to the surrounding air. Collection system. 6. A third temperature detecting means for detecting a temperature of air before heat exchange in a second condenser and a fourth temperature detecting means for detecting a temperature of water circulating in a heat storage tank. , 4th
The temperature of the air detected by the temperature detecting means is compared with the temperature of the circulating water, and the operation of the first condenser and the second condenser is switched according to the comparison result. 5. The exhaust heat recovery system according to 5. 7. A water amount detecting means for detecting an amount of chilled water which is not supplied with sufficient heat from the water circulating in the heat storage tank, wherein the amount of chilled water detected by the water amount detecting means is equal to or less than a predetermined amount. 7. The exhaust heat recovery system according to claim 5, wherein the second condenser is operated to perform a heat radiation operation for discharging the air to the surrounding air. 8. A water circulation path for taking out water below the heat storage tank and exchanging heat with the first condenser to generate hot water, and further comprising a water circulation path for returning the hot water below the heat storage tank. An exhaust heat recovery system according to claim 7. 9. The exhaust heat recovery system according to claim 8, wherein the cooling device is a refrigerator or a freezer. 10. A low-temperature heat recovery tank for storing a liquid that has exchanged heat with the exhaust heat of a plurality of electric devices, a compressor, a condenser for exchanging heat with water circulating in the heat storage tank, and a liquid in the low-temperature heat recovery tank. Waste heat recovery, comprising: a refrigeration cycle device that forms a refrigerant circuit by connecting an evaporator that exchanges heat with a pipe to form a refrigerant circuit; and hot water utilization means that uses the heat stored in the heat storage tank as hot water. system. 11. The exhaust heat recovery system according to claim 10, wherein the waste water used by the hot water utilization means flows into the low-temperature heat recovery tank. 12. At least one electric device is connected to a compressor for electric device, a heat exchange part for exchanging heat with a low-temperature heat recovery tank, a throttling means for electric device, and an evaporator for electric device through piping to circulate a refrigerant. And the cold heat obtained by the electric equipment evaporator is used for cooling, further provided with an ice heat storage tank, the cooling is performed by the electric equipment evaporator, and the ice heat storage tank is operated as an evaporator. A heat storage operation for storing cold heat, and a heat exchange unit that exchanges heat with the low-temperature heat recovery tank operates as a condenser and operates the ice heat storage tank as a supercooling heat exchanger that supercools the refrigerant. The exhaust heat recovery system according to claim 10 or 11, wherein the system is configured to be able to switch between a heat storage use operation for supplying cold heat to the equipment evaporator. 13. The heat storage tank according to claim 1, wherein a time period for storing heat in the heat storage tank is set, and control is performed such that heat is stored in the heat storage tank during this time period. Exhaust heat recovery system. 14. The heat storage tank according to claim 2, wherein the heat storage tank is filled with a latent heat storage material, and water is circulated around the heat storage tank. Exhaust heat recovery system. 15. A refrigeration cycle device in which a compressor, a first heat exchanger, a throttling means, and a second heat exchanger are connected by piping, and a refrigerant is circulated through the first heat exchanger to exchange heat with the refrigerant. A first latent heat storage tank having a first latent heat storage material that stores heat at a first temperature, and a second latent heat storage tank that exchanges heat with a refrigerant in a second heat exchanger to store heat at a second temperature different from the first temperature. And a second latent heat storage tank having a latent heat storage material, wherein one of the first and second heat exchangers is operated as an evaporator and heat is exchanged with the latent heat storage tank to exchange heat with the evaporator. An exhaust heat recovery system that stores heat and stores heat in a latent heat storage tank that operates the other heat exchanger as a condenser and exchanges heat with it. 16. Among the first and second latent heat storage materials, the latent heat storage material that stores heat is solidified at a temperature higher than the temperature at which heat is stored and stores heat, and the latent heat storage material that stores cold heat is 16. The exhaust heat recovery system according to claim 15, wherein the heat is solidified and stored at a temperature lower than the temperature at which the heat is stored. 17. The apparatus according to claim 15, wherein at least one of the first and second latent heat storage tanks is configured such that a pipe constituting a refrigeration cycle device passes through the inside of the latent heat storage tank. Item 17. An exhaust heat recovery system according to Item 16. 18. The first and second latent heat storage tanks store heat at a temperature higher than 0.degree. C., and the latent heat storage tank stores cold heat at a temperature of 0.degree. 2. An ice heat storage tank for storing cold heat.
An exhaust heat recovery system according to claim 5 or claim 16 or claim 17. 19. The apparatus according to claim 15, wherein hot or cold heat stored in at least one of the first and second latent heat storage tanks is used for a hot or cold load. An exhaust heat recovery system according to any one of Claims 18 to 18.