JP2001141312A - Water heater consisting of refrigerating cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water heater consisting of a refrigerating cycle wherein a condensation pressure is lower than an allowable value and besides hot water of 70 deg.C or higher is generated. SOLUTION: A supply water pipe 21 and a supply hot water pipe 22 are connected to a heat-exchanger 10 for hot water supply of a refrigerating cycle and a pressure type temperature regulating valve 30 to control a supply water flow rate by sensing the pressure of the refrigerant of the refrigerating cycle is situated in the supply water pipe 21. A supply water flow rate of the pressure type temperature regulating valve 30 and the heat transfer area, the size, and the degree of supercooling of the heat-exchanger 10 for hot water supply are properly decided, and hot water having a condensation pressure of 2.15 MPa or less and a supply hot water temperature of 70 deg.C or higher is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a compressor, a condenser,
The present invention relates to a water heater comprising a refrigeration cycle, wherein the condenser of a refrigeration cycle including an evaporator or the like is selected as a hot water supply heat exchanger, and a water supply pipe and a tapping pipe are connected to the hot water supply heat exchanger. is there.

[0002]

2. Description of the Related Art A heat pump or a refrigeration cycle is
It is well known in the art, not to mention the name of the document, and is composed of a compressor, a condenser, an expansion valve, an evaporator, and the like. Therefore, when the compressor is started and the refrigerant is circulated between the condenser, the expansion valve, the evaporator, and the like, the refrigerant changes state to liquid, gas, and liquid, and at that time, the condenser emits heat to the outside, Since the external heat is absorbed by the evaporator, the condenser can be used as a heating source and the evaporator can be used as a cooling source for cooling and heating. A water heater using such a refrigeration cycle is also well known in the art. A compressor for compressing a refrigerant, a condenser for producing hot water by a high-temperature refrigerant sent from the compressor, that is, a heat exchanger for hot water supply, and the refrigerant receives heat from the outside And a gas evaporator.

Therefore, when the switching valve is switched so that the refrigerant flows toward the hot water supply heat exchanger, the refrigerant is condensed from gas to liquid in the hot water supply heat exchanger. At this time, since latent heat is released, when cold water is supplied to the hot water supply heat exchanger from, for example, a water pipe, the cold water exchanges heat with a high-temperature refrigerant in the hot water supply heat exchanger, is heated, and is instantaneously discharged from the hot water supply pipe. Hot water is taken out. Also, the water in the hot water storage tank can be heated by circulating it between the hot water storage tank and the hot water supply heat exchanger.

[0004]

As described above, hot water has been conventionally obtained instantaneously by a refrigeration cycle, and hot water has been obtained by circulating heating. However, sufficient water has been obtained for the following reasons. Is not used. That is,
This is because the hot water temperature obtained by the conventional heat pump is as high as about 55 ° C. and the tapping temperature is low. The tapping temperature is determined by adjusting the condensing pressure of the heat pump to, for example, 2.2MPa.
It is expected that the pressure can be increased to some extent by increasing the pressure to a or more.However, when the condensing pressure is increased, the compressor is forced to operate severely, and the pressure difference between the high pressure and the low pressure during operation is actually large. In addition, many machines are provided with safety devices for the purpose of preventing high-pressure operation, and the operation pressure is limited to, for example, 2.75 MPa or less.
The tapping temperature is about 55 ° C. Further, with a conventional heat pump capable of obtaining instantaneous hot water, it is possible to obtain hot water having a tapping temperature of 60 ° C. or higher, but the temperature of water supplied to the hot water supply heat exchanger is 0 to 35 °.
C is the limit, and the temperature of hot water of about 35 to 55 ° C. immediately after being used as a heat source for cooling and heating cannot be raised again, which is inefficient. For the above reasons, regardless of the instantaneous method or the circulation method, there is a problem that it is difficult to use as a heat source for air-conditioning and hot water supply, a heat source for floor heating, a heat source for drying, etc.

[0005] For the reasons described above, despite the good thermal efficiency of the refrigeration cycle, it has not been fully utilized in hot water supply devices. Accordingly, an object of the present invention is to provide a hot water supply apparatus which solves the above-mentioned conventional drawbacks or problems. Specifically, a hot water supply apparatus comprising a refrigeration cycle having a low condensing pressure and a high tapping temperature. It is intended to provide. In addition, another invention is capable of circulating and heating relatively hot water in a hot water storage tank having a high tapping temperature, and another invention is capable of circulating and heating hot water in a hot water storage tank, It is an object of the present invention to provide a hot water supply device including a refrigeration cycle that can use hot water in a hot water storage tank as a heat source for bath water, a heat source for floor heating, a heat source for drying, and the like.

[0006]

According to the present invention, a condenser of a refrigeration cycle is selected as a heat exchanger for hot water supply, and a water supply pipe or a tap water pipe connected to the heat exchanger for hot water supply preferably has a flow control valve. As a result of experimentally examining the tapping temperature of the hot water supply heat exchanger by appropriately combining the water supply flow rate by the flow rate control valve, the heat transfer area of the hot water supply heat exchanger, the size, etc. The water supply flow rate by the flow control valve, the heat transfer area of the hot water supply heat exchanger, the size, based on the knowledge that the above object of the present invention is achieved by optimally combining the degree of supercooling, According to the first aspect of the present invention, in order to achieve the above object, the condenser of a refrigeration cycle including a compressor, a condenser, an evaporator and the like is selected as a heat exchanger for hot water supply, and the heat exchanger for hot water supply is selected. Is a hot water supply device with a water supply pipe and a tap water pipe connected to Therefore, a flow rate control valve is interposed in any of the water supply pipe and the tapping pipe, and the flow rate of water supplied by the flow rate control valve, the heat transfer area, the size, the degree of supercooling, etc. of the heat exchanger for hot water supply are appropriately determined. The hot water having a condensing pressure equal to or lower than the allowable pressure and a tapping temperature of 60 ° C. or higher is obtained. The invention according to claim 2 is a compressor,
The condenser of the refrigeration cycle comprising a condenser, an evaporator and the like is selected as a hot water supply heat exchanger, and the hot water supply heat exchanger is connected to a water supply pipe and a tapping pipe. Either the water supply pipe or the tapping pipe is provided with a flow control valve, and the flow rate of the water supplied by the flow control valve, the heat transfer area of the heat exchanger for hot water supply, the size, the degree of supercooling, and the like are appropriately determined. The hot water of 35 ° C. or more can be supplied to the hot water supply heat exchanger when the condensing pressure is equal to or lower than the allowable pressure, and the outlet temperature is 60 ° C.
It is configured so that the above warm water can be obtained. Claim 3
In the invention described in the above, the condenser of the refrigeration cycle including a compressor, a condenser, an evaporator and the like is selected as a heat exchanger for hot water supply,
A hot water storage tank is connected to the hot water supply heat exchanger by a water supply pipe and a hot water supply pipe, and when the hot water temperature detected in the hot water storage tank falls below a predetermined temperature, the hot water in the hot water storage tank is connected to the hot water storage tank. A hot water supply apparatus configured to circulate heat between the hot water supply heat exchanger and the hot water supply apparatus, wherein one of the water supply pipe and the hot water supply pipe is provided with a flow control valve, By appropriately determining the flow rate of the water supplied by the valve, the heat transfer area of the heat exchanger for hot water supply, the size, the degree of supercooling, etc., when the temperature of a predetermined location in the hot water storage tank drops to a predetermined temperature, The hot water is circulated between the hot water storage tank and the hot water supply heat exchanger, and hot water of 60 ° C. is stored at a condensing pressure equal to or lower than an allowable pressure.
According to a fourth aspect of the present invention, a heat load device for bathing, heating, drying, or the like is connected to the hot water storage tank of the third aspect. The flow control valve according to any one of the items 1 to 4, is configured by a pressure-type temperature control valve that senses the pressure of the refrigerant in the refrigeration cycle and controls the supply flow rate.

[0007]

Embodiments of the present invention will be described below. FIG. 1 is a schematic view showing a first embodiment of the present invention, in which (a) is a front view of the whole, and (b) is a perspective view of a heat exchanger for hot water supply. As shown in (a), the hot water supply device including the refrigeration cycle according to the first embodiment includes a refrigeration cycle unit 1 and a hot water supply unit 20. The refrigeration cycle unit 1 is, as is well known,
A compressor 2, a heat exchanger 10 for hot water supply that functions as a condenser,
It consists of an expansion valve 3, an evaporator 4, etc.
7, 8 and 9 form a closed cycle. A refrigerant such as ammonia instead of Freon, which has exited from the compressor 2, enters through an inlet pipe 11 provided above one of the hot water supply heat exchangers 10, and has an outlet provided below one of the heat exchangers. After exiting from the pipe 12, it enters the expansion valve 3 through the pipe 7, and circulates with the evaporator 4 and the compressor 2 as is well known in the art. In the hot water supply heat exchanger 10, water or hot water is generated by the latent heat of the refrigerant. It is designed to be heated. A cooling fan 5 is provided corresponding to the evaporator 4.

The heat exchanger 10 for hot water supply is a plate type heat exchanger in the present embodiment, and the structure itself is well known in the prior art, and therefore will not be described in detail, but as shown in FIG. The whole has a vertically elongated substantially cubic shape, and a plurality of plates are provided therein. The heat transfer area, capacity, and the like are appropriately selected according to the area, the number, and the like of the plurality of plates. A refrigerant inlet pipe 11 and a water or hot water outlet pipe 22 'are provided above such a hot water supply heat exchanger 10, and a refrigerant outlet pipe 12 and a water or hot water inlet pipe 21' are provided therebelow. Are provided.

The hot water supply unit 20 includes, for example, a water supply pipe 21 connected to a water supply source and a tapping pipe 22. The water supply pipe 21 is connected to an inlet pipe 21 'of the heat exchanger 10 for hot water supply, and the tapping pipe 22 is connected to an outlet pipe 22'. Such a water supply pipe 21 has a pressure-type temperature control valve 3.
0 is interposed. The pressure type temperature control valve 30 is connected to a pressure sensor 6 ′ attached to the discharge pipe 6 of the compressor 2 via a signal line b. Thereby, the opening degree of the pressure type temperature control valve 30 is controlled according to the pressure of the refrigerant during operation. In other words, the amount of water supply or the amount of hot water is controlled in accordance with the pressure fluctuation of the machine, that is, the refrigerant, due to peripheral conditions such as the outside air temperature.

Next, the operation of the first embodiment will be described. The refrigeration cycle unit 1 is started. Then, the refrigerant flows into the compressor 2, the hot water supply heat exchanger 10, the expansion valve 3,
Circulation is performed in the order of the evaporator 4 and the compressor 2. During this time, the state changes as is well known in the art, and becomes liquid in the hot water supply heat exchanger 10, at which time latent heat is released. Since the heat transfer area and size of the hot water supply heat exchanger 10 are appropriately selected, when the flow rate is adjusted by the pressure type temperature control valve 30 and supplied to the hot water supply heat exchanger 10, the condensing pressure Is about 2.15
MPa is relatively low, and the supercooling degree of the conventional refrigeration cycle is much higher than 5 ° C., higher than 30 ° C., and 70 ° C.
C or more warm water is obtained.

According to the present embodiment, since the temperature of the obtained hot water is as high as 70 ° C. or more, FIG.
As shown by the dashed line in, the obtained high-temperature hot water can be stored in the hot water storage tank T, and the faucet J can be opened when necessary, and can be used by appropriately mixing with cold water. At this time, the capacity of the hot water storage tank T has an advantage that it can be small because the temperature of the hot water to be stored is high. Further, in the above embodiment, the pressure type temperature control valve 30 is interposed in the water supply pipe 21, but may be provided in the tapping pipe 22. As described above, it is apparent that substantially the same high-temperature hot water can be obtained even when provided in the tapping pipe 22. Further, since the pressure-type temperature control valve 30 controls the hot water supply amount in accordance with the pressure fluctuation of the machine, that is, the refrigerant, due to peripheral conditions such as the outside air temperature, for example, the water supply amount or the hot water output amount is manually or It is clear that the present invention can be implemented with a flow control valve that can be adjusted according to the outside air temperature.

[0012] Reasons why such high-temperature hot water can be obtained
Is not certain, but for the amount of water supplied,
When the heat transfer area of the heat exchanger 10 is increased and the capacity is increased,
Heat exchange with gaseous refrigerant in the hot water supply heat exchanger 10
The time becomes longer, the refrigerant can be sufficiently condensed,
So that the condensation pressure is about 2.15 MPa
As low as 70 ° C or higher.
You might also say that. To further explain possible reasons,
FIG. 3 is a Mollier diagram showing the flow of the refrigerant,
Depending on the method, for example, hot water with a water supply temperature of 65 ° C for hot water supply
If you try to get 70 ° C hot water by supplying to the heat exchanger,
The flow of the refrigerant is like a, b, c, d, a in FIG.
And the condensation pressure is about 2.94 MPa (30 kg / c
m²)become. This pressure exceeds the allowable pressure of the machine.
2.7 MPa (28 kg / cm ²) In the machine
It is actually 7 because it is stopped for safety.
Hot water at 0 ° C. cannot be obtained. In contrast, the present embodiment
Then, as shown in FIG.
The heat transfer area of the heat exchanger for hot water supply to an ordinary condenser.
Larger than the required heat transfer area, e.g.
As a result, the condensation pressure dropped to about 2.15 MPa,
Moreover, it is thought that hot water with a high temperature of 70 ° C or more can be obtained.
It is. The flow of the refrigerant at this time is indicated by A, B, C, D, and A.
You. The supercooling can be performed in various ways, for example, by adding the refrigerant to the evaporator.
You can also get a lot by passing through.

Next, a second embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and the same components are denoted by the same reference numerals with dashes “′” and will not be described repeatedly. . According to the second embodiment, the hot water supply apparatus includes the refrigeration cycle unit 1, the hot water supply unit 20 ', and the heat load unit 40. The hot water supply unit 20 ′ includes a hot water storage tank 25, and a lower portion of the hot water storage tank 25 and the water supply pipe 21 are connected by a pipe 26 in which a first control valve 27 is interposed. The water supply pipe 21 has a second control valve 2.
8 and a pump 29 are interposed and are connected to an inlet pipe 21 ′ as a secondary side water supply pipe 21 ″. A branch pipe 24 branched from a tapping pipe 22 is connected to an upper part of the hot water storage tank 25. A temperature sensor S is attached to a lower part of the hot water storage tank 25, and the temperature sensor S and the pump 29 are connected by a signal line a, and the temperature of the hot water in the hot water storage tank 25 becomes lower than a set temperature. Is detected by the temperature sensor S, the pump 29 is activated and the hot water in the hot water storage tank 25 is circulated and heated by the hot water supply heat exchanger 10.

The heat load section 40 includes a heat exchanger 41, a bathtub,
It comprises a heat consuming unit 42 such as a heater and a dryer. The heat exchanger 41 and the hot water storage tank 25 are connected by a primary side hot water supply pipe 43 and a primary side hot water return pipe 44. Further, the heat exchanger 41 and the heat consuming unit 42 are connected by a secondary-side hot water supply pipe 46 and a secondary-side hot water return pipe 47.
Therefore, the first hot water return pipe 44
When the pump 45 is started, the relatively high-temperature hot water in the hot water storage tank 25 circulates between the hot water storage tank 25 and the heat exchanger 41 and the second hot water return pipe 47 is interposed in the second hot water return pipe 47. When the pump 48 is started, the heat medium, for example, water or hot water filled in the secondary hot water supply pipe 46 and the secondary hot water return pipe 47 circulates between the heat exchanger 41 and the heat consuming unit 42. become.

Since the second embodiment is configured as described above, the following various types of heating can be performed. (A) When hot water is directly obtained: It is assumed that the hot water storage tank 25, the primary hot water supply pipe 43, the primary hot water return pipe 44, and the like are filled with hot water. The refrigeration cycle unit 1 is started. On the other hand, the first control valve 27 of the pipe 26 is closed, the second control valve 28 of the water supply pipe 21 is opened, and the faucet 23 of the tapping pipe 22 is opened. The pressure type temperature control valve 30 is adjusted. And then
The pump 29 is started. Then, the flow rate of the cold water supplied from the water supply pipe 21 is adjusted by the pressure-type temperature control valve 30 and supplied to the hot water supply heat exchanger 10. In the heat exchanger 10 for hot water supply, as described above, heat exchange is performed with the refrigerant in the refrigeration cycle unit 1, and the temperature of the heat is increased to 70 ° C. or more, and the heat exits the tapping pipe 22. Since the hot water storage tank 25, the primary side hot water supply pipe 43, the primary side hot water return pipe 44 and the like are filled with hot water, there is a fluid resistance, and the heated hot water flows out of the faucet 23. Thereby, high-temperature hot water is directly obtained. It should be noted that an on-off valve is provided in the branch pipe 24, the primary-side hot water supply pipe 43, and the like, and it is clear that the pipes 24 and 43 can be closed when tapping directly.

(B) When tapping out of hot water storage tank 25:
Since the hot water storage tank 25 is now filled with hot water, the opening of the first control valve 27 in the pipe 26 is adjusted, and the water supply pipe 21 is
The second control valve 28 is closed. Then, cold water is supplied from the water supply pipe 21. Then, the hot water in hot water storage tank 25 is pushed up. Since the primary-side hot water supply pipe 43, the primary-side hot water return pipe 44, and the like are filled with hot water, there is fluid resistance, and the high-temperature hot water in the hot water storage tank 25 that is pushed up flows out of the faucet 23.

(C) When circulating and heating the hot water in the hot water storage tank 25: When the temperature sensor S of the hot water storage tank 25 detects that the temperature has dropped to the set temperature, for example, when it detects that the temperature has dropped to 50 ° C. or less, the pump 29 operates. Hot water below the hot water storage tank 25 is supplied to the first and second control valves 27 and 28.
And supplied to the hot water supply heat exchanger 10 after being adjusted by the pressure type temperature control valve 30. In the hot water supply heat exchanger 10, as described above, heat is exchanged with the refrigerant in the refrigeration cycle unit 1 to be heated to a high temperature, supplied to the upper part of the hot water storage tank 25, and stored sequentially from above. Thereafter, the hot water in the hot water storage tank 25 is circulated and heated in the same manner. When the temperature sensor S detects that the temperature has reached the set temperature, it stops.

(D) When heating the consuming unit 42: 1, 2
First and second pumps 45, 48 of the secondary side hot water return pipes 44, 47
Start Then, the hot water in the hot water storage tank 25 becomes 1
Secondary side hot water supply pipe 43, heat exchanger 41, primary side hot water return pipe 4
4. Circulate in the order of hot water storage tank 25. On the other hand, the consumer unit 42
For example, in the case of floor heating, hot water which is a heat medium in the case of floor heating, and in the case of a bathtub, hot water is supplied by the heat exchanger 41, the secondary hot water supply pipe 46, the consuming section 42, the secondary hot water return pipe 47, the heat exchanger 41. Circulate in order. In this heat exchanger 41, hot water as a heat medium,
Alternatively, it is heated and radiated by the consuming unit 42.
Thereby, the consuming unit 42 is heated. When the temperature of the hot water in the hot water storage tank 25 decreases with the heating of the consuming unit 42, as described above, the refrigeration cycle unit 1 starts and the pump 29 starts, and the hot water in the hot water storage tank 25 is circulated and heated. You. In addition, for example, the present applicant has disclosed in Japanese Patent Application Laid-Open Nos. 7-21195 and 10-3
14255, a filtration device proposed by No.
A sterilizer or the like can be appropriately incorporated.

It is clear that the second embodiment can be variously heated in combinations other than the above. For example, the hot water can be discharged from the hot water storage tank 25 and directly heated when the hot water in the hot water storage tank 25 decreases by a predetermined amount. Also,
It is also clear that when the hot water in the hot water storage tank 25 is being circulated and heated, cold water can be supplied from the first control valve 27 to supply hot water. Further, it is apparent that the hot water storage tank 25 can be implemented in substantially the same manner even with an open type tank.

Example 1 A test was carried out using a water heater as shown in FIG. At this time, the capacity of the compressor was 3 horsepower, the heat exchanger for hot water supply was a plate type (the number of plates was 50), and the heat transfer area was 1.2 mm ² (outer diameter: width, depth, width, height was 103 mm, 135 mm, 302 mm), and the volume was 1, 4 liters. Hot water having an outside air temperature of 6 ° C and a tapping temperature of 70 ° C was obtained. At this time, the amount of water supplied by the pressure-type temperature control valve (the amount of hot water) was 161 liters / hour. The condensation pressure was 2.1 MPa. The water temperature was raised and tested at 51 ° C.
° C warm water was obtained.

Example 2 A test was performed using the same hot water supply apparatus as in Example 1. At this time, the capacity of the compressor was 3 hp, which is the same as that of the first embodiment. The heat exchanger for hot water supply was a plate type (the number of plates was 30), and the heat transfer area was 1.76 mm ² (outer diameter dimensions: width, depth and width). , Height is 125mm, 85mm, 532m
m), the volume was 2.0 liters. Outside air temperature is 10
Hot water with a tap water temperature of 71 ° C. was obtained at a temperature of 20 ° C. and a feed water temperature of 20 ° C. At this time, the amount of water supplied by the pressure-type temperature control valve (the amount of hot water) was 197 liters / hour. The condensation pressure was 2.15 MPa. Increase the temperature of the water supply 51
Tested at ° C, no problem.

From the results of Examples 1 and 2, the heat transfer area or capacity of the hot water supply heat exchanger and the amount of water or hot water supplied to the hot water supply heat exchanger are closely related to the temperature of the obtained hot water. It is estimated that the time of heat exchange with the gaseous refrigerant in the heat exchanger for hot water supply, the degree of condensation of the refrigerant, the amount of supercooling, etc. will be affected, and by appropriately selecting the above relationship,
It has been found that hot water of 60 ° C. or higher can be obtained without increasing the condensation pressure. Also in connection with the above, even when the temperature of the hot water supplied to the hot water supply heat exchanger becomes high,
It was also found that hot water up to about ° C could be supplied to the hot water supply heat exchanger.

[0023]

As described above, according to the present invention, the water supply flow rate by the flow control valve provided in either the water supply pipe or the tapping pipe, the heat transfer area of the heat exchanger for hot water supply of the refrigeration cycle,
Since the size, the degree of supercooling, and the like are appropriately determined, an effect unique to the present invention is obtained in which high-temperature hot water having a condensing pressure of not more than an allowable pressure and a tapping temperature of 60 ° C. or more can be obtained. In addition, since the flow rate of the water supply by the flow rate control valve, the heat transfer area and the size of the heat exchanger for hot water supply, and the degree of supercooling are appropriately determined,
The effect that hot water of 35 ° C. or more can be supplied to the hot water supply heat exchanger is also obtained. Furthermore, since hot water of 35 ° C. or more can be supplied to the hot water supply heat exchanger, high-temperature hot water in the hot water storage tank can be circulated and heated, and hot water of 55 ° C. or more can be stored in the hot water storage tank. In this way, high-temperature hot water can be circulated and stored, so that the hot water in the hot water storage tank can be heated,
It can also be used as a heat source for heating and drying.

[Brief description of the drawings]

FIG. 1 is a view showing a first embodiment of the present invention, in which (a) is a front view schematically showing the whole, and (b) is a perspective view showing a heat exchanger for hot water supply in a partial cross section. FIG.

FIG. 2 is a front view schematically showing the whole second embodiment of the present invention.

FIG. 3 is a Mollier diagram showing a flow of a refrigerant.

[Description of Signs] 1 Refrigeration cycle unit 2 Compressor 4 Evaporator 10 Heat exchanger for hot water supply 20 Hot water supply unit 21 Water supply pipe 22 Hot water supply pipe 25 Hot water storage tank 40 Heat load unit 41 Heat exchanger

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[Procedure amendment]

[Submission date] November 18, 1999 (1999.11.
18)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG. 2

FIG.

FIG. 3

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Michiyuki Takahashi 2-15-15 Miyahara-cho, Omiya-shi, Saitama Science Inside (72) Inventor Akihiro Kobayashi 2-15-10 Miyahara-cho, Omiya-shi, Saitama Ensu Inc.

Claims (5)

[Claims] 1. The condenser of a refrigeration cycle comprising a compressor, a condenser, an evaporator and the like is selected as a hot water supply heat exchanger, and a water supply pipe and a tap water pipe are connected to the hot water supply heat exchanger. A flow control valve is interposed in one of the water supply pipe and the tapping pipe, a flow rate of water supplied by the flow control valve, a heat transfer area, a size, and supercooling of the heat exchanger for hot water supply. The condensing pressure is below the allowable pressure, and the tapping temperature is 60 °.
A hot water supply device comprising a refrigeration cycle, wherein hot water of C or more is obtained. 2. The condenser of a refrigeration cycle including a compressor, a condenser, an evaporator and the like is selected as a hot water supply heat exchanger, and a water supply pipe and a tap water pipe are connected to the hot water supply heat exchanger. A flow control valve is interposed in one of the water supply pipe and the tapping pipe, a flow rate of water supplied by the flow control valve, a heat transfer area, a size, and supercooling of the heat exchanger for hot water supply. The hot water of 35 ° C. or more can be supplied to the hot water supply heat exchanger at a condensing pressure of not more than the allowable pressure, and the tap water temperature is 60 ° C.
A hot water supply device comprising a refrigeration cycle, wherein the hot water is obtained. 3. The condenser of a refrigeration cycle comprising a compressor, a condenser, an evaporator and the like is selected as a hot water supply heat exchanger, and a hot water storage tank is connected to the hot water supply heat exchanger by a water supply pipe and a tapping pipe. When the hot water temperature detected in the hot water storage tank falls below a predetermined temperature, the hot water in the hot water storage tank is circulated between the hot water storage tank and the hot water supply heat exchanger to be heated. A flow control valve is interposed in one of the water supply pipe and the tapping pipe, a flow rate of water supplied by the flow control valve, a heat transfer area of the heat exchanger for hot water supply, and a size. By appropriately determining the degree of supercooling and the like, when the temperature of a predetermined location in the hot water storage tank falls to a predetermined temperature, the hot water in the hot water storage tank causes a gap between the hot water storage tank and the hot water supply heat exchanger. Circulates and stores hot water at 60 ° C with condensing pressure below allowable pressure Characterized in that it is hot water supply apparatus comprising a refrigeration cycle. 4. A hot water storage tank according to claim 3, wherein
A hot water supply device comprising a refrigeration cycle to which a heat load device for heating, drying, etc. is connected. 5. The refrigeration cycle according to claim 1, wherein the flow control valve is a pressure-type temperature control valve that senses the pressure of the refrigerant in the refrigeration cycle and controls the flow rate of water supply. Become a hot water supply device.