JP2003222395A - Multi-functional water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an entire water circuit K in a refrigerating cycle unit 1c from freezing without affecting hot water in a tank 7. <P>SOLUTION: This multi-functional water heater comprises a supplied hot water temperature sensor 16 for detecting a water temperature in the water circuit K, an intermediate temperature water supply passage 15 for supplying intermediate temperature water after circulating a brine heating circuit B to the water circuit K, and water passage selector valves 13 and 14 for selecting the circulation of the intermediate temperature water to the intermediate temperature water supply passage 15. When a water temperature detected by the supplied hot water temperature sensor 16 is lower than a specified value in a state of circulation in a refrigerant circuit R stopped, a control device 20 supplies the intermediate temperature water to the water circuit K by using the intermediate temperature water supply passage 15. By this constitution, the entire water circuit K in the refrigerating cycle unit 1c can be prevented from freezing without affecting hot water in the tank 7 by supplying the intermediate temperature water coming out at approx. 50°C by the heating of brine in a water brine heat exchanger 8 to the water circuit K in the stopped refrigerating cycle unit 1c by using the intermediate temperature water supply passage 15. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention heats water for hot water supply to a high temperature in a refrigeration cycle using a refrigerant, and uses the heated high-temperature water for floor heating and the like (fluid serving as a heat exchange medium). TECHNICAL FIELD The present invention relates to a multi-functional hot water supply device for heating water to an intermediate temperature, and particularly to prevention of freezing of a hot water supply heating circuit.

[0002]

2. Description of the Related Art Conventionally, there is a multi-function water heater that has a function of heating brine to an intermediate temperature as an additional function to a water heater that uses a refrigerating cycle such as a heat pump as a heating device. It is used for heating, such as floor heating. FIG. 5 is a schematic diagram showing the configuration of an example of such a conventional multi-functional water heater.

The hot water heated to a high temperature in the refrigeration cycle unit 1a is stored in the hot water storage tank 7 in the tank unit 1b, and is mixed with cold water from the tap water to adjust the temperature at the time of use. Supplied. Further, the floor heating unit 1c is connected to the tank unit 1b, the high temperature water in the hot water storage tank 7 is supplied to the water brine heat exchanger 8 to heat the brine, and the heated brine is heated by the floor heating panel 1
0 is supplied. The reference numerals in FIG. 5 correspond to the reference numerals given to the embodiments described later.

The reason why the brine circuit is provided in addition to the hot water supply circuit for floor heating is to prevent the pipes in the floor heating panel from freezing and cracking at midnight in winter and the like. Etc. are used. By the way, such floor heating supplies the brine at a temperature of about 60 ° C, which does not feel hot, and at a temperature of about 40 ° C, which does not feel cold so that a comfortable heating feeling can be obtained even if the human body directly touches the floor material. The temperature and flow rate are controlled so that they will come back.

Further, the refrigeration cycle for heating the hot water is often operated mainly after entering the midnight time zone in order to effectively use the midnight power. Therefore, during the daytime hours in winter, etc. When the refrigeration cycle is stopped, the hot water supply remaining in the hot water supply heating circuit K in the outdoor refrigeration cycle unit 1a cools and freezes, causing the refrigerant water heat exchanger 3 and the hot water supply circulation pump 6 to freeze and crack. It can happen and must be prevented.

Conventionally, as a method for preventing freezing, when the outside air temperature is low, the water circulation in the refrigeration cycle unit is stopped and only the refrigeration cycle is operated to prevent freezing of the refrigerant water heat exchanger and the water pipes around it. There is something. Further, in JP-A-11-63661, water in a hot water storage tank is circulated by a water pump to prevent freezing of a water circuit.

[0007]

However, the above-mentioned conventional method of operating only the refrigeration cycle has a problem that the freezing of the water pipe and the water pump in the portion away from the refrigerant water heat exchanger cannot be prevented. In the method of circulating water in the hot water storage tank of the publication, cold water flows into the hot water storage tank, which lowers the temperature of the hot water in the hot water storage tank and creates an uneven temperature distribution, which makes it possible to control hot water at a desired temperature. There is a problem that it becomes difficult.

There is also a problem due to the addition of an additional function of heating the brine to an intermediate temperature as a multi-function water heater. As described above, the hot water obtained by heating the brine to about 60 ° C. in the water brine heat exchanger 8 is, for example, about 50 ° C. in the case of floor heating (return water temperature from the floor heating panel 10 is 40 ° C.).
Since it returns to the hot water storage tank 7 at a temperature of about + 10 ° C.), hot water having a temperature higher than the tap water temperature is stored in the lower portion of the hot water storage tank 7.

When the refrigeration cycle unit 1a is operated in this state to heat the hot water to a high temperature of about 90 ° C., the temperature of the hot water supplied to the hot water supply passage 3b of the refrigerant water heat exchanger 3 is high, so that the high pressure is high. There is also a problem that the outlet refrigerant temperature on the refrigerant passage 3a side also rises, the heating capacity in the refrigeration cycle decreases, and the heating efficiency for compression power decreases.

The present invention has been made in view of the above conventional problems, and a first object thereof is to freeze the entire water circuit in the refrigeration cycle unit without affecting the hot water in the hot water storage tank. The second purpose is to prevent
An object of the present invention is to provide a multi-function water heater that does not reduce the heating efficiency of hot water even if hot water is heated while brine heating is performed at an intermediate temperature.

[0011]

In order to achieve the above object, the present invention employs the following technical means.

According to the first aspect of the present invention, the hot water supply water temperature detecting means (16) for detecting the hot water supply water temperature in the hot water supply heating circuit (K) and the medium temperature water after flowing through the brine heating circuit (B) are provided. A medium temperature water supply passage (15) for supplying to the hot water supply water heating circuit (K) and a water passage switching means (13, 14) for switching distribution to the medium temperature water supply passage (15) are provided,
The control means (20) stops the circulation of the refrigerant circuit (R), and when the water temperature detected by the hot water supply water temperature detection means (16) becomes lower than a predetermined value, the medium temperature water supply passage ( 1
5) is used to supply medium temperature water to the hot water supply water heating circuit (K).

As a result, the refrigeration cycle unit (1c) in which the medium temperature water which is heated by the water brine heat exchanger (8) and comes out at a temperature of about 50 ° C. is stopped from the medium temperature water supply passage (15). ) To the hot water supply heating circuit (K) in the freezing water tank (7) without affecting the hot water in the refrigeration cycle unit (1c) to freeze the entire hot water supply heating circuit (K). Can be prevented.

According to the second aspect of the present invention, the medium temperature water from the medium temperature water supply passage (15) is supplied to the refrigerant water heat exchanger (3) of the hot water supply water heating circuit (K) and the hot water inflow portion of the hot water storage tank (7). (7
b), and is returned to the inside of the hot water storage tank (7) from the lower part of the hot water storage tank (7) after flowing through the refrigerant water heat exchanger (3) and the hot water supply water circulation pump (6). To do.

As a result, the medium temperature water supplied from the medium temperature water supply passage (15) is radiated (freezing prevention) to the refrigerant water heat exchanger (3) of the hot water supply heating circuit (K) and the hot water circulation pump (6). ) And then returns to the bottom of the hot water storage tank (7) with the temperature lowered, the heating efficiency of the hot water does not drop even if the hot water is heated at a high temperature during the brine heating at the intermediate temperature. You can

In the third aspect of the present invention, the medium temperature water temperature detecting means (17) for detecting the medium temperature water temperature in the brine heating circuit (B) is provided, and the control means (20) controls the refrigerant circuit (R). When circulating the brine heating circuit (B) while the circulation is stopped, the hot water supply water temperature detecting means (16)
When the water temperature in the hot water supply water heating circuit (K) detected at is lower than the water temperature in the brine heating circuit (B) detected by the medium temperature water temperature detecting means (17), the medium temperature water supply passage (15) is connected. It is characterized in that the medium temperature water is returned to the lower part of the hot water storage tank (7) through the hot water supply heating circuit (K).

Thus, if the temperature can be lowered by passing the hot water supply heating circuit (K) rather than directly returning the medium temperature water to the lower part of the hot water storage tank (7), the hot water supply heating circuit (K) is turned on. By selecting the route through which the temperature of the medium temperature water returned to the lower part of the hot water storage tank (7) can be lowered, even if the high temperature hot water is heated while the intermediate temperature brine heating is being performed, It is possible to prevent the heating efficiency from decreasing.

Incidentally, the reference numerals in parentheses of the above-mentioned respective means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a multifunctional water heater of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic diagram showing the structure of a multifunctional water heater according to an embodiment of the present invention, showing a state in which hot water supply water heating, hot water supply, and floor heating are performed. The multi-functional water heater 1 in the present embodiment uses the supercritical heat pump cycle to heat the hot water to a high temperature (about 90% in the present embodiment).
(C)) and using the heated high-temperature water to heat a brine such as an antifreeze solution serving as a heat exchange medium to an intermediate temperature (about 60 ° C in this embodiment) to heat the brine in a house, for example, It is used for floor heating.

The supercritical heat pump cycle (hereinafter,
The abbreviated as “heat pump” means a heat pump cycle in which the refrigerant pressure on the high-pressure side is equal to or higher than the critical pressure of the refrigerant, and is a heat pump cycle using carbon dioxide, ethylene, ethane, nitric oxide or the like as the refrigerant.

The water heater 1 is roughly divided into a refrigeration cycle unit 1 mainly containing refrigeration cycle equipment described later.
a and a tank unit 1 mainly containing a hot water storage tank 7.
b, and the floor heating unit 1c in this embodiment. The inside of the refrigeration cycle unit 1a is roughly divided into a refrigerant circuit R such as a heat pump cycle and a hot water supply water heating circuit K related to hot water supply.

First, the refrigerant circuit R of the heat pump cycle
Is a compressor 2 for compressing a refrigerant, a refrigerant water heat exchanger 3 as a heating means for hot water supply, a pressure reducing valve 4 as a pressure reducing means,
A refrigerant air heat exchanger 5 for absorbing heat from the atmosphere is connected in a ring shape, and carbon dioxide (CO ₂ ) having a low critical temperature is enclosed as a refrigerant.

The compressor 2 is composed of a built-in drive motor and a high-pressure compressing section for boosting and discharging the sucked gas refrigerant to a high pressure higher than a critical pressure, and these are housed in a closed container. There is. The refrigerant water heat exchanger 3 heats the hot water for hot water supply by exchanging heat between the high-temperature high-pressure gas refrigerant that has been boosted in the high-pressure compression section and the hot water supply water, and the hot water supply water passage 3b is adjacent to the high pressure refrigerant passage 3a. The high pressure refrigerant passage 3a is provided.
The flow direction of the refrigerant flowing through and the flow direction of the hot water for hot water supply flowing through the hot water supply passage 3b are opposed to each other.

The pressure reducing valve 4 is provided between the refrigerant water heat exchanger 3 and the refrigerant air heat exchanger 5, and reduces the pressure of the refrigerant cooled by the refrigerant water heat exchanger 3 from a high pressure to a low pressure, thereby reducing the refrigerant air heat. Supply to the exchanger 5. The pressure reducing valve 4 has a configuration in which the valve opening degree can be electrically adjusted, and the energization is controlled by the control device 20. The refrigerant-air heat exchanger 5 receives air blown by a blower fan (not shown), evaporates the refrigerant decompressed by the pressure reducing valve 4 by heat exchange with the atmosphere, and the gasified refrigerant is sucked by the compressor 2 described above. It

Next, the hot water supply heating circuit K for hot water supply is provided with a hot water supply passage 3b of the refrigerant water heat exchanger 3 which is means for heating the hot water supply, and a hot water supply circulation pump 6 for circulating the hot water supply.
And a hot water storage tank 7 that stores hot water for hot water supply are connected in an annular shape.

The hot water supply water circulation pump 6 is, as shown in FIG. 1, a cold water outflow portion 7a provided in the lower portion of the hot water storage tank 7.
A cold water is generated from the cold water through the hot water supply passage 3b of the refrigerant water heat exchanger 3 so as to flow back from the hot water inflow portion 7b provided at the upper portion of the hot water storage tank 7. This hot water circulation pump 6
Can adjust the amount of flowing water according to the number of rotations of a built-in motor (not shown).

The hot water storage tank 7 is made of metal (for example, stainless steel) having excellent corrosion resistance and has a heat insulating structure, and can keep hot water for hot water supply for a long time. The hot-water supply water stored in the hot-water storage tank 7 is mainly used in a kitchen, a bath or the like after being mixed with cold water from the tap water by the temperature control valve 12 to control the temperature when the hot water is discharged.

Next, the floor heating unit 1c is roughly composed of a brine heating circuit B for heating brine and a floor heating-related brine circuit. First, the brine heating circuit B that heats the brine includes a water brine heat exchanger 8 that is a means for heating the brine, a hot water supply circulation pump 9 that circulates the hot water, and a hot water storage tank 7 that stores the hot water. It is configured by connecting in a ring shape.

The water brine heat exchanger 8 heats the brine by exchanging heat between the high temperature water stored in the hot water storage tank 7 and the brine, and the brine passage 8b is provided adjacent to the high temperature water passage 8a. The flow direction of the hot water flowing through the hot water passage 8a and the flow direction of the brine flowing through the brine passage 8b are opposed to each other.

The hot water supply circulation pump 9 is, as shown in FIG. 1, a hot water outflow portion 7 provided in an upper portion of the hot water storage tank 7.
High temperature water from c to high temperature water passage 8a of the water brine heat exchanger 8
A water flow is generated so as to flow back from the medium temperature water inflow portion 7d provided at the bottom of the hot water storage tank 7. The circulating pump 9 for hot water supply can adjust the amount of flowing water according to the number of rotations of a built-in motor (not shown).

Next, the floor heating-related brine circuit includes a brine passage 8b of the water brine heat exchanger 8 which is a means for heating the brine, a floor heating panel 10, and a brine circulation pump 11 for circulating the brine. It is configured by connecting in a ring. The floor heating panel 10 is a piping panel arranged under the floor plate of the living room.

The brine circulation pump 11 can adjust the flow rate of brine to be circulated according to the number of rotations of a built-in motor (not shown). In addition, such a floor heating is provided at a temperature of about 60 ° C at which the brine does not feel hot, and at a temperature of about 40 ° C at which the brine does not feel cold, so that a comfortable heating feeling can be obtained even if the human body directly touches the floor material. The temperature and flow rate are controlled so that they will come back.

Next, the structure relating to the main part of the present invention will be described.

A medium temperature water supply passage 15 for supplying the medium temperature water after flowing through the brine heating circuit B to the hot water supply heating circuit K is provided. Then, two three-way valves 13 and 14 are provided as water channel switching means for switching the distribution to the medium temperature water supply channel 15.

One is provided as a three-way valve 14 on the side of the brine heating circuit downstream of the water brine heat exchanger 8 and the hot water circulation pump 9, and the medium temperature water from the water brine heat exchanger 8 flows into the medium temperature water at the bottom of the hot water storage tank 7. The flow is switched between flowing into the portion 7d and flowing into the medium temperature water supply passage 15.

The other one is provided between the refrigerant water heat exchanger 3 and the hot water inflow portion 7b of the hot water storage tank 7 as the hot water supply water heating circuit side three-way valve 13, and the high temperature water from the refrigerant water heat exchanger 3 is supplied. The hot water inflow portion 7b in the upper part of the hot water storage tank 7 or the medium temperature water from the medium temperature water supply passage 15 is caused to flow into the refrigerant water heat exchanger 3.

Further, as a hot water supply water temperature detecting means for detecting the hot water supply water temperature in the hot water supply water heating circuit K, a water temperature sensor 16 is provided on the cold water inflow side of the refrigerant water heat exchanger 3 during hot water supply. This is provided as a hot water supply sensor even in the conventional hot water supply device.

Reference numeral 20 denotes a control device for controlling the operation of the hot water supply device 1, which receives signals from the operation panel (not shown), the water temperature sensor 16 and other devices, and receives the compressor 2, the expansion valve 4, and the hot water supply. Water circulation pump 6, hot water supply circulation pump 9, brine circulation pump 11, temperature control valve 12, hot water supply heating circuit side three-way valve 13, brine heating circuit side three-way valve 14
Etc. to output a control signal.

Next, the control of the main part of the present invention will be described.

FIG. 2 is a flow chart showing the freeze prevention control in the device 1 of FIG. First, step S1
It is determined whether the refrigerant circulation is stopped in the refrigerant circuit R. Specifically, it is determined based on the operating condition of the compressor 2 and N
In the case of O, the process proceeds to step S3, the medium temperature water of the brine heating circuit B is made to flow from the three-way valve 14 to the lower part of the hot water storage tank 7, and the hot water of the hot water supply heating circuit K is made to flow from the three-way valve 13 to the upper part of the hot water storage tank 7. Then, hot water supply and floor heating can be performed while heating the hot water supply water in FIG.

If the determination in step S1 is YES while the refrigerant circulation is stopped, the process proceeds to step S2 and the water temperature sensor 1
It is determined whether or not the temperature of the hot water supplied is detected at 6 or lower than a predetermined value. In the present embodiment, 3 ° C. is set as a predetermined value and NO is higher than 3 ° C.
In the case of, the operation proceeds to the above-mentioned step S3 and the normal operation state is established.

However, in the case of YES at 3 ° C. or lower, it is necessary to prevent freezing, and the process proceeds to step S4, and the medium temperature water of the brine heating circuit B is supplied to the hot water supply heating circuit K. Specifically, the medium temperature water is circulated from the three-way valve 14 to the medium temperature water supply passage 15,
After passing through the hot water passage 3b of the refrigerant water heat exchanger 3 and the hot water supply water circulation pump 6 from the three-way valve 13 to warm the water circuit, the water circuit is returned from the lower part of the hot water storage tank 7 into the hot water storage tank 7.

FIG. 3 shows a state in which the hot water supply heating circuit K in the refrigeration cycle unit 1a is protected against freezing while enabling hot water supply and floor heating. And step S
5. If it is detected that the temperature of the hot water supplied through the high-temperature water passage 3b of the refrigerant water heat exchanger 3 and detected by the water temperature sensor 16 has risen above a predetermined value (10 ° C. in this embodiment) The program is repeated from the determination of S1.

In this way, the water temperature sensor 16 for detecting the temperature of the hot water supplied in the hot water supply heating circuit K and the brine heating circuit B
The medium temperature water supply passage 15 for supplying the medium temperature water after circulating the medium temperature to the hot water supply water heating circuit K and the three-way valves 13 and 14 for switching the circulation to the medium temperature water supply passage 15 are provided, and the control device 20 controls the refrigerant. When the water temperature detected by the water supply temperature sensor 16 becomes lower than a predetermined value while the circulation of the circuit R is stopped, the medium temperature water is supplied to the hot water supply heating circuit K using the medium temperature water supply passage 15. ing.

As a result, the medium temperature water which is heated at a temperature of about 50 ° C. by heating the brine in the water brine heat exchanger 8
By supplying to the hot water supply heating circuit K in the refrigeration cycle unit 1c stopped from the medium temperature water supply passage 15, the hot water supply heating circuit in the refrigeration cycle unit 1c is not affected without affecting the hot water in the hot water storage tank 7. It is possible to prevent freezing of the entire K. By the way, the supply of medium-temperature water for preventing freezing is performed regardless of whether or not the floor heating is in operation.

The medium temperature water from the medium temperature water supply passage 15 is
It is supplied between the refrigerant water heat exchanger 3 of the hot water supply water heating circuit K and the hot water inflow portion 7b of the hot water storage tank 7, flows through the refrigerant water heat exchanger 3 and the hot water supply circulation pump 6, and then from the lower part of the hot water storage tank 7. It is returned to the hot water storage tank 7.

As a result, the medium-temperature water supplied from the medium-temperature water supply passage 15 radiates heat (antifreezing) to the refrigerant water heat exchanger 3 and the hot-water supply circulation pump 6 of the hot-water supply heating circuit K to lower the temperature. Since the temperature returns to the lower part of the hot water storage tank 7, it is possible to prevent the heating efficiency of the hot water supply from being lowered even if the high temperature hot water is heated during the intermediate temperature brine heating.

(Second Embodiment) FIG. 4 is a flow chart showing the efficiency improvement control in the apparatus 1 of FIG. 1 as the second embodiment of the present invention. By using the apparatus configuration of FIG. 1, it is intended to prevent the hot water supply water heating efficiency from being deteriorated in the normal state. As a necessary configuration, as shown in FIG. 1, a water temperature sensor 17 is provided on the downstream side of the water brine heat exchanger 8 as a medium water temperature detecting means for detecting the medium water temperature in the brine heating circuit B, and a controller 20 is provided. Are typing in.

First, the control is performed by the refrigerant circuit R in step S11.
It is determined whether or not the refrigerant circulation is stopped. N in the refrigerant circulation
In the case of O, the process proceeds to step S14, and the brine heating circuit B
The medium temperature water is made to flow from the three-way valve 14 to the lower part of the hot water storage tank 7, and the high temperature water of the hot water supply heating circuit K is made to flow to the upper part of the hot water storage tank 7 from the three-way valve 13 to supply hot water while heating the hot water. Make the floor heating possible.

If the determination in step S11 is YES because the refrigerant circulation is stopped, the process proceeds to step S12 and it is determined whether or not the floor heating is in operation. Specifically, the operating conditions of the hot water supply circulation pump 9 and the brine circulation pump 11 are determined,
In the case of NO during the stop, the routine proceeds to step S14 described above, and the normal operating state is set.

When the determination in step S12 is YES during the floor heating operation, the process proceeds to step S13, and whether the temperature of the hot water supplied by the water temperature sensor 16 is lower than the temperature of the medium temperature water detected by the water temperature sensor 17 or not. Determine whether or not. When the temperature of the hot water supply is higher than the temperature of the medium temperature water and NO is determined, the process proceeds to the above step S3, and the normal operation state is set.

However, if the temperature of the hot water supply is lower than the temperature of the medium temperature water and the answer is YES, the process proceeds to step S15, where the medium temperature water of the brine heating circuit B is passed through the hot water supply heating circuit K to cool the medium temperature water. Specifically, after the medium-temperature water is circulated from the three-way valve 14 to the medium-temperature water supply passage 15, and the three-way valve 13 is passed through the high-temperature water passage 3b of the refrigerant water heat exchanger 3 and the hot water circulation pump 6 to cool the medium-temperature water. The lower part of the hot water storage tank 7 is returned to the hot water storage tank 7.

The flow in each circuit is the same as in FIG. 3, but in the present embodiment, the hot water supply heating circuit K in the refrigeration cycle unit 1a cools medium temperature water while performing hot water supply and floor heating. . The program is repeated from the determination of step S11.

As described above, the water temperature sensor 17 for detecting the medium temperature water temperature in the brine heating circuit B is provided, and the control device 20 controls the circulation of the brine heating circuit B while the circulation of the refrigerant circuit R is stopped. When performing, the water temperature in the hot water supply heating circuit K detected by the water temperature sensor 16 is the water temperature sensor 1.
When the water temperature is lower than the water temperature in the brine heating circuit B detected at 7, medium temperature water is returned to the lower portion of the hot water storage tank 7 via the hot water supply heating circuit K using the medium temperature water supply passage 15.

Thus, if the temperature can be lowered by passing the hot water supply heating circuit K rather than directly returning the medium temperature water to the lower part of the hot water storage tank 7, the route passing through the hot water supply heating circuit K is selected. Since the temperature of the medium temperature water returned to the lower portion of the hot water storage tank 7 can be lowered, even if the high temperature hot water is heated while the intermediate temperature brine heating is performed, the heating efficiency of the hot water is not lowered. be able to.

(Other Embodiments) In the above embodiments, the supercritical heat pump cycle is used as the refrigeration cycle for heating the hot water for hot water supply, but the present invention is not limited to this, and other refrigerant compression refrigeration cycles are used. May be applied to.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a multi-function hot water supply apparatus according to an embodiment of the present invention, showing a state where hot water supply water heating, hot water supply, and floor heating are performed.

FIG. 2 is a flow chart showing freeze prevention control in the apparatus of FIG.

FIG. 3 shows a state in which hot water supply, floor heating, and freeze prevention are performed by the device of FIG.

FIG. 4 is a flowchart showing efficiency improvement control in the apparatus of FIG.

FIG. 5 is a schematic diagram showing a configuration of an example of a conventional multi-functional water heater.

[Explanation of symbols]

2 compressor 3 Refrigerant water heat exchanger 3a High pressure refrigerant passage 3b Hot water supply passage 4 Pressure reducing valve (pressure reducing means) 5 Refrigerant air heat exchanger 6 Hot water supply circulation pump 7 Hot water storage tank 7b Hot water inflow part 8 Water brine heat exchanger 8a Hot water passage 8b brine passage 9 Hot water circulation pump 13 Tank upper three-way valve (water channel switching means) 14 Brine heating circuit side three-way valve (water channel switching means) 15 Medium temperature water supply channel 16 Hot water supply water temperature sensor (hot water supply water temperature detection means) 17 Medium temperature water temperature sensor (Medium temperature water temperature detection means) 20 Control device (control means) B brine heating circuit R refrigerant circuit W hot water supply water heating circuit

Claims (3)

[Claims] 1. A refrigerant circuit comprising a compressor (2) for compressing a refrigerant, a high pressure refrigerant passage (3a) of a refrigerant water heat exchanger (3), a pressure reducing means (4), and a refrigerant air heat exchanger (5). (R) and the hot water supply passage (3) of the refrigerant water heat exchanger (3)
b), hot water supply water circulation pump (6), and hot water storage tank (7)
Hot water supply water heating circuit (K) having a hot water storage tank (7), hot water passage (8) of the water brine heat exchanger (8)
a), a brine heating circuit (B) having a hot water supply circulation pump (9), and a control means (20) for controlling the operation thereof
And a hot water supplied through the hot water supply passage (3b) and a high temperature high pressure refrigerant flowing through the high pressure refrigerant passage (3a) by operating the compressor (2) and the hot water supply circulation pump (6). To heat the hot water to heat the hot water, and to operate the hot water circulating pump (9) to heat the hot water flowing through the hot water passage (8a) and the water brine heat exchanger (8). In a multifunctional water heater for heating the brine by exchanging heat with the brine flowing through the brine passage (8b), hot water supply water temperature detecting means (16) for detecting hot water temperature in the hot water supply heating circuit (K). And a medium temperature water supply path (15) for supplying the medium temperature water after flowing through the brine heating circuit (B) to the hot water supply heating circuit (K), and switching between circulation to the medium temperature water supply path (15). Channel switching means (1
3, 14), and the control means (20) is in a state in which the circulation of the refrigerant circuit (R) is stopped, and the hot water supply water temperature detection means (16).
When the water temperature detected in step 1 is lower than a predetermined value, the medium temperature water is supplied to the hot water supply heating circuit (K) using the medium temperature water supply passage (15). . 2. The medium temperature water from the medium temperature water supply passage (15) is supplied to the refrigerant water heat exchanger (3) of the hot water supply water heating circuit (K) and the hot water inflow portion (7) of the hot water storage tank (7). 7b)
Between the refrigerant water heat exchanger (3) and the hot water supply water circulation pump (6) and then returned to the inside of the hot water storage tank (7) from the lower part of the hot water storage tank (7). The multi-function hot water supply device according to claim 1. 3. The medium temperature water temperature detecting means (17) for detecting the medium temperature water temperature in the brine heating circuit (B) is provided, and the control means (20) stops the circulation of the refrigerant circuit (R). When the brine heating circuit (B) is circulated in the state in which the hot water supply water temperature detecting means (16) detects the water temperature in the hot water supply water heating circuit (K), the medium temperature water temperature detecting means is detected. When the water temperature is lower than the water temperature in the brine heating circuit (B) detected in (17), the medium temperature water is supplied through the medium temperature water supply passage (15) to the hot water supply heating circuit (K) to store hot water. The multi-function water heater according to claim 2, wherein the multi-function water heater is returned to the lower part of the tank (7).