JP2003166749A - Heat-pump hot water supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-pump hot water supply system to be set in a narrower space than a conventional system, which supplies hot water quickly after hot water runs out without causing a problem such as destruction of ozone layers when a refrigerant is released in the atmospheric air. <P>SOLUTION: The heat-pump hot water supply system comprises: first and second hot water tanks 10 and 20 connected in series with pipes to a refrigerant- water heat exchanger 6; a hot water supply pipe 13H for supplying hot water in the first hot water tank to a use part 4; a first switch valve 20C and a circulation pump 5 mounted in the middle of a pipe 22H connecting the second hot water tank and the refrigerant-water heat exchanger; a bypass pipe 11H bypassing the second hot water tank and connecting the first hot water tank to a pipe between the first switch valve and the circulation pump; a second switch valve 10C mounted on the bypass pipe; and a control means 30 for controlling the switch valves so that the second switch valve is closed when the first switch valve is open, and the second switch valve is opened when the first switch valve is closed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump hot water supply system that utilizes the heat of condensation of a refrigerant to heat hot water in a hot water storage tank with a heat exchanger.

[0002]

2. Description of the Related Art FIG. 6 is a circuit diagram showing a conventional heat pump hot water supply system. In FIG. 6, A is a hot water supply circuit and B is a heat pump refrigerant circuit.

In the hot water supply circuit A, 1 is a hot water storage tank for storing hot water, 2 is a temperature sensor for detecting the temperature of the hot water storage tank 1, 3 is a pressure reducing valve for reducing the water supply water pressure, 4
Is a faucet for tapping hot water boiled in the hot water storage tank 1,
5 is a circulation pump 5 that operates when the heat pump is heated,
6 is a refrigerant-to-water heat exchanger, and M is a flow of water.

In the heat pump refrigerant circuit B, an arrow R
Indicates a flow of the refrigerant, A1 is a compressor for compressing the refrigerant, 6 is a refrigerant-to-water heat exchanger for exchanging heat between the refrigerant and water,
A3 is a decompressor for decompressing the refrigerant, and A4 is an evaporator for exchanging heat between the outside air and the refrigerant. The hot water supply circuit A and the heat pump refrigerant circuit B communicate with each other through heat exchange with the refrigerant-to-water heat exchanger 6.

Next, the operation of the conventional heat pump hot water supply system having the above structure will be described. The supplied water is decompressed by the pressure reducing valve 3. The depressurized water is guided to the hot water storage tank 1. The hot water storage tank 1 is always full of water, and when the input temperature of the temperature sensor 2 reaches a preset temperature, the heat pump heating request is stopped. Here, when it is determined that the temperature of the temperature sensor 2 becomes lower than a predetermined temperature (for example, 45 ° C.) by the setting of the remote controller or the like, and the hot water is exhausted, the circulation pump 5 is in the operating state, while the heat pump refrigerant circuit The compressor A1 of B starts operation, condenses the refrigerant and performs heat exchange in the refrigerant-to-water heat exchanger 6, and water is sucked up by the circulation pump 5 from the lower part of the hot water storage tank 1 of the hot water supply circuit A, so that the refrigerant pair It is heated by the water heat exchanger 6 and returned to the upper part of the hot water storage tank 1. As a result, the entire water in the hot water storage tank 1 is gradually heated.

[0006]

As described above, since the conventional heat pump hot water supply system is composed of one hot water storage tank, a certain amount of hot water is stored (for example, 320 L).
In order to secure the above, it is necessary to select either to increase the diameter of the hot water storage tank or to extend it in the height direction. In terms of height, there is a limit due to restrictions on the housing module and restrictions on transportation by container type trucks. Therefore, it becomes necessary to increase the diameter of the hot water storage tank. here,
If the diameter of the hot water storage tank is increased, it becomes impossible to make the device thinner, and the area for installation is increased by the increased diameter of the hot water storage tank, which increases the installation space.

If all the hot water in the hot water storage tank is used up, the water in the hot water storage tank is gradually boiled up while circulating, so that the temperature can be used as hot water. It will take a considerable amount of time. Therefore, there is a problem that even if you want to use hot water immediately, you have to wait for a long time.

The refrigerant in the heat pump refrigerant circuit B is
For example, CFCs (R11, R12, R134a, etc.) have been commonly used. However, CFCs have problems such as destruction of the ozone layer when released into the atmosphere.

The present invention has been made to solve the above problems, and is thin and has a small installation space.
An object of the present invention is to provide a heat pump hot water supply system which is excellent in instant hot water property and does not cause a problem such as destruction of the ozone layer even when the refrigerant is discharged into the atmosphere.

[0010]

In order to achieve the above object, the invention described in claim 1 is a heat pump refrigerant circuit comprising a compressor, a refrigerant-to-water heat exchanger, a pressure reducer and an evaporator. A first and second hot water storage tanks connected in series to the refrigerant-to-water heat exchanger, a hot water supply pipe for supplying hot water of the first hot water storage tank to a utilization portion, the second hot water storage tank and a refrigerant pair A first opening / closing valve and a circulation pump interposed in the middle of a pipe connecting the water heat exchanger, and the second hot water storage tank bypassing the first hot water storage tank to the first opening / closing valve and a circulation pump. The bypass pipe communicating with the pipe between the two, the second opening / closing valve interposed in the bypass pipe, the second opening / closing valve is closed when the first opening / closing valve is open, and the first opening / closing valve is closed. And a control means for controlling the second on-off valve to open at times. .

According to a second aspect of the present invention, a heat pump refrigerant circuit composed of a compressor, a refrigerant-to-water heat exchanger, a pressure reducer and an evaporator, and a pipe connected in series to the refrigerant-to-water heat exchanger. Connected first and second hot water storage tanks, a hot water supply pipe for supplying hot water of the first hot water storage tank to the utilization portion, a temperature sensor provided in the first hot water storage tank, the second hot water storage tank, and refrigerant-to-water heat No. 1 installed in the middle of the piping that connects with the exchanger
An on-off valve and a circulation pump, a bypass pipe that bypasses the second hot water storage tank and connects the first hot water storage tank to a pipe between the first on-off valve and the circulation pump, and a bypass pipe interposed in the bypass pipe. A second opening / closing valve, and a control means for controlling the second opening / closing valve to be closed when the first opening / closing valve is open and to open the second opening / closing valve when the first opening / closing valve is closed. Prepare,
The control means is configured to close the first opening / closing valve and open the second opening / closing valve when a temperature sensor provided in the first hot water storage tank is at a predetermined temperature or higher. And

According to a third aspect of the present invention, a heat pump refrigerant circuit composed of a compressor, a refrigerant-to-water heat exchanger, a pressure reducer and an evaporator, and a pipe connected in series to the refrigerant-to-water heat exchanger. The first and second hot water storage tanks that are connected, the hot water supply pipe that supplies the hot water of the first hot water storage tank to the utilization portion, and the pipe that connects the second hot water storage tank and the refrigerant-to-water heat exchanger A first open / close valve and a circulation pump, and a bypass pipe that bypasses the second hot water storage tank and connects the first hot water storage tank to a pipe between the first open / close valve and the circulation pump;
A second opening / closing valve interposed in the bypass pipe and the second opening / closing valve are closed when the first opening / closing valve is opened, and the second opening / closing valve is opened when the first opening / closing valve is closed. And a rotation speed control means for controlling the rotation speed of the compressor.

According to a fourth aspect of the present invention, a heat pump refrigerant circuit composed of a compressor, a refrigerant-to-water heat exchanger, a pressure reducer and an evaporator, and a pipe connected in series to the refrigerant-to-water heat exchanger. The first and second hot water storage tanks that are connected, the hot water supply pipe that supplies the hot water of the first hot water storage tank to the utilization portion, and the pipe that connects the second hot water storage tank and the refrigerant-to-water heat exchanger A first open / close valve and a circulation pump, and a bypass pipe that bypasses the second hot water storage tank and connects the first hot water storage tank to a pipe between the first open / close valve and the circulation pump;
The second opening / closing heat pump refrigerant circuit valve interposed in the bypass pipe and the second opening / closing valve are closed when the first opening / closing valve is open, and the second opening / closing valve is opened when the first opening / closing valve is closed. It is characterized by comprising control means for controlling to open the valve and opening control means for controlling the opening of the pressure reducer.

The invention according to a fifth aspect is the first to the fourth aspects.
In the heat pump hot water supply system according to the above item 1, carbon dioxide refrigerant is used in the heat pump refrigerant circuit.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. 1 is a first embodiment of the present invention.
It is a block diagram of the heat pump hot water supply system which shows. Figure 1
In A, A is a hot water supply circuit, B is a heat pump refrigerant circuit, and the heat pump hot water supply system is composed of these hot water supply circuit A and heat pump refrigerant circuit B.

In the hot water supply circuit A, 1H is a water supply pipe from an external water supply, 3 is a pressure reducing valve for reducing the water supply water pressure, and 5
Is a circulation pump that operates when the heat pump is heated, 6 is a refrigerant-to-water heat exchanger, 10 is a first hot water storage tank, 12K is a water outlet provided under the first hot water storage tank 10, 20 is a second hot water storage tank, and 21K Is a water intake provided at the upper part of the second hot water storage tank 20, and 21H is a connecting pipe connecting the water outlet 12K at the lower part of the first hot water storage tank 10 and the water intake 21K at the upper part of the second hot water storage tank 20.

2A is a temperature sensor attached to the bottom of the first hot water storage tank 10, 2B is a temperature sensor attached to the bottom of the second hot water storage tank 20, and 13H is the first hot water storage tank 10.
, Which is attached to the upper part of the hot water supply pipe to supply the boiling water to the use part such as a bathtub, 4 is a faucet attached to the end of the hot water supply pipe 13H, and 14H is the refrigerant-to-water heat exchanger 6 and the first hot water storage tank 10. The hot water supply pipe 10H connecting the upper part of the first hot water storage tank 10H has one end connected to the lower part of the first hot water storage tank 10
B (4th on-off valve) interposed water supply pipe, 22H is the second
One end is connected to the lower portion of the hot water storage tank 20 and the other end is connected to the refrigerant-to-water heat exchanger 6, and the on-off valve 20
Circulation piping with C (first on-off valve) interposed, 20H is the second
One end is connected to the lower portion of the hot water storage tank 20, and is a water supply pipe in which an opening / closing valve 20B (third opening / closing valve) is interposed in the middle.

Reference numeral 11H is a bypass pipe that bypasses the second hot water storage tank 20 and connects the first hot water storage tank 10 to the pipe between the first on-off valve 20C and the circulation pump 5, and in the middle of the bypass pipe 11H. An on-off valve 10C (second on-off valve) is interposed in the valve.

More specifically, a hot water outlet 13S and a hot water supply port 14K are provided in the upper part of the first hot water storage tank 10, and one end of a hot water supply pipe 13H is connected to the hot water discharge port 13S.
Further, one end of a hot water supply pipe 14H is connected to the hot water supply port 14K.

At the bottom of the first hot water storage tank 10,
Water supply port 10K and bypass port 11J are provided, and water supply port 1
One end of a water supply pipe 10H having an opening / closing valve 10B on the way is connected to 0K, and the other end of the water supply pipe 10H is connected to a water supply pipe 1H from an external water supply. Further, the bypass port 11J is a bypass pipe 1 provided with an opening / closing valve 10C on the way.
It is connected to one end of 1H and the other end of the bypass pipe 11H is connected to the circulation pipe 22H.

At the lower part of the second hot water storage tank 20, a water supply port 2 is provided.
0K and a circulation port 22J are provided, one end of a water supply pipe 20H having an opening / closing valve 20B is connected to the water supply port 20K, and the other end of the water supply pipe 20H is connected to a water supply pipe 1H from an external water supply. There is. The circulation port 22J is connected to one end of a circulation pipe 22H having an opening / closing valve 20C on the way, and the other end of the circulation pipe 22H is connected to the refrigerant-to-water heat exchanger 6.

Open / close valve 10B, open / close valve 10C, open / close valve 20
B and the on-off valve 20C are arranged so that the hot and cold water flowing through the refrigerant-to-water heat exchanger 6 is opened and closed from the refrigerant-to-water heat exchanger 6 to the first
The hot water storage tank 10 alone or the first hot water storage tank 10 and the second hot water storage tank 10
The hot water storage tank 20 functions as a switching unit that switches and selects the flow of water supplied to both hot water storage tanks.

In the heat pump refrigerant circuit B, the arrow R indicates the flow of the refrigerant, A1 is a compressor for compressing the refrigerant,
Reference numeral 6 is the above-mentioned refrigerant-to-water heat exchanger, A3 is a decompressor for decompressing the refrigerant, and A4 is an evaporator for exchanging heat between the outside air and the refrigerant, which are sequentially connected by a refrigerant pipe.
Here, the compressor A1 can change the rotation speed, and the decompressor A3 can change the opening degree.
And the said refrigerant | coolant uses the carbon dioxide (CO2) refrigerant | coolant.

FIG. 2 is a control block diagram showing an embodiment of the present invention. In FIG. 2, reference numeral 30 denotes a water heater controller (not shown in FIG. 1) that controls the water heater unit,
The water heater controller 30 has three inputs. The details are the temperature sensor 2A, the temperature sensor 2B, and the remote controller 40 (not shown in FIG. 1). Each control is performed using the temperature sensors 2A and 2B as inputs. Further, the remote control 40 can change the hot water temperature. Further, the water heater control device 30 has five output units. The breakdown is circulation pump 5, on-off valve 1.
0B, on-off valve 10C, on-off valve 20B, on-off valve 20C. Here, the circulation pump 5 is controlled by the water heater controller 30.
The operation control and the opening / closing control of each on-off valve are performed.

Reference numeral 31 denotes a heat pump refrigerant circuit control device (not shown in FIG. 1) which controls the heat pump refrigerant circuit B.
Therefore, the heat pump refrigerant circuit control device 31 has
There are two outputs. The breakdown is compressor A1,
The pressure reducer A3. Here, the heat pump refrigerant circuit control device 31 controls the operating capacity of the compressor A1 and the opening degree of the pressure reducer A3. That is, it is the control of the rotation speed of the compressor A1 and the opening degree of the pressure reducer A3. In addition, communication is performed between the water heater control device 30 and the heat pump refrigerant circuit control device 31 to exchange information.

Next, the operation of the embodiment will be described with reference to the block diagrams of FIGS. 4, 5, and 2 and the flowchart of FIG. In FIGS. 4 and 5, arrows M2 and M1 indicate respective water flows.

First, FIG. 4 will be described. Step S
If the temperature sensor 2A in 1 is above the set temperature (for example, 45 ° C.) set by the remote controller 40 or the like, step S
Go to 2. In this state, it is determined that the amount of hot water used is small, and in order to boil the tank of the first hot water storage tank 10, the open / close valves 10B and 10C are opened and the open / close valves 20B and 20C are closed. Then, the water supplied from the tap water is M in FIG.
As shown in 2, it flows into the first hot water storage tank 10 through the opened on-off valve 10B. And the first hot water storage tank 1
The water flowing into 0 is circulated by the circulation pump 5 to the bypass port 1
1J flows into the bypass pipe 11H, passes through the on-off valve 10C provided on the way, flows into the first hot water storage tank 10 from the circulation pump 5, the refrigerant-to-water heat exchanger 6, the hot water supply pipe 14H, and the hot water supply port 14K. To do. The water flowing into the first hot water storage tank 10 again passes through the bypass port 11J and the bypass pipe 11
Water flows into H, passes through an on-off valve 10C provided on the way, and circulates in the first hot water storage tank 10 from the circulation pump 5, the refrigerant-to-water heat exchanger 6, the hot water supply pipe 14H, and the hot water supply port 14K.

While the water is circulating, the compressor A1
Is operated and heat is exchanged in the refrigerant-to-water heat exchanger 6 to gradually warm the water in the first hot water storage tank 10.

From step S2, the process proceeds to step S3. In step S3, it is determined whether or not the temperature sensor 2A attached to the lower portion of the first hot water storage tank 10 is at or above a preset temperature (for example, 60 ° C.) set by a remote controller or the like. As a result, when the temperature is higher than the set temperature, it is determined that the water in the first hot water storage tank 10 has boiled up, and the compressor A
The operation of No. 1 is stopped, the operation of the circulation pump 5 is also stopped at substantially the same time, and the boiling of the hot water is completed.

In step S3, if the temperature of the temperature sensor 2A is below the set temperature, it is determined that the water in the first hot water storage tank 10 has not boiled yet, and the compressor A1 and the circulation pump 5 reach the set temperature. Continue driving.

Next, FIG. 5 will be described. Step S1
If the temperature sensor 2A is below the set temperature (for example, 45 ° C.) set by the remote controller 40 or the like in step S4,
Proceed to. In this state, it is determined that the amount of hot water used is large,
In order to boil both the first hot water storage tank 10 and the second hot water storage tank 20, the on-off valves 10B and 10C are closed,
The on-off valves 20B and 20C are opened. Then, the water supplied from the tap water flows into the second hot water storage tank 20 through the open / close valve 20B as shown by M1 in FIG. Then, the water flowing into the second hot water storage tank 20 flows into the circulation pipe 22H from the circulation port 22J by the circulation pump 5,
The circulation pump 5, passing through the on-off valve 20C provided on the way,
The refrigerant-to-water heat exchanger 6, the hot water supply pipe 14H, and the hot water supply port 14K flow into the first hot water storage tank 10.

The water flowing into the first hot water storage tank 10 flows from the water outlet 12K through the connecting pipe 21H into the second hot water storage tank 20 from the water intake 21K. Second hot water storage tank 20
The water that has flowed into the inside is circulated again from the circulation port 22J.
It flows into H, passes through the on-off valve 20C provided on the way, flows into the first hot water storage tank 10 from the circulation pump 5, the refrigerant-to-water heat exchanger 6, the hot water supply pipe 14H, and the hot water supply port 14K, and then the water outlet. Water intake 21 from 12K through connecting pipe 21H
It flows from K into the second hot water storage tank 20. In this way, water circulates in the two hot water storage tanks 10 and 20.

Then, while the water is circulating, the compressor A1
Is operated and heat is exchanged in the refrigerant-to-water heat exchanger 6 to gradually warm the water in the first hot water storage tank 10 and the second hot water storage tank 20.

From step S4, the process proceeds to step S5. In step S5, it is determined whether or not the temperature sensor 2B attached to the lower portion of the second hot water storage tank 20 is at or above a preset temperature (for example, 60 ° C.) preset by the remote controller 40 or the like. As a result, when the temperature is equal to or higher than the set temperature, it is determined that the water in both the first hot water storage tank 10 and the second hot water storage tank 20 has boiled up, the operation of the compressor A1 is stopped, and the circulation pump 5 is also operated substantially at the same time. To stop boiling water.

In step S5, if the temperature of the temperature sensor 2B is below the set temperature, it is determined that the water in both hot water storage tanks 10 and 20 has not boiled up yet, and the compressor A1 and the circulation pump 5 are set to the set settings. Continue operation until the temperature is reached.

Further, in steps S1, S3 and S5, the temperature of the heat medium flowing to the heat pump refrigerant circuit B side can be adjusted to adjust the temperature of the hot water in the hot water storage tank. As a method thereof, a method of controlling the rotation speed of the compressor A1, that is, in a case where the hot water in the hot water storage tanks 10 and 20 is desired to be quickly boiled, the rotation speed of the compressor A1 is increased and a slow boiling is required. Reduces the rotation speed of the compressor A1.

Furthermore, in order to control the opening of the decompressor A3, that is, when it is desired to boil the hot water in the hot water storage tanks 10 and 20 quickly, the opening of the decompressor A3 is increased and the compressor A1 is opened. When it is desired to increase the amount of the flowing refrigerant and slowly boil it, the opening degree of the pressure reducer A3 is reduced to reduce the compressor A1.
It reduces the amount of refrigerant flowing through.

As described above, according to the embodiment, the heat pump refrigerant circuit and the two hot water storage tanks 10 and 20 are connected in series by piping, and the hot water supply pipe 13H for supplying the hot water of the first hot water storage tank 10 to the utilization portion, By bypassing the first on-off valve 20C and the circulation pump 5 provided in the middle of the pipe 22H that connects the second hot water storage tank 20 and the refrigerant-to-water heat exchanger 6, and the second hot water storage tank 20, The first hot water storage tank 10 is provided with a pipe 22H between the first opening / closing valve 20C and the circulation pump 5.
To the bypass pipe 11H and the bypass pipe 11H
The second opening / closing valve 10C and the first opening / closing valve 20
Since the second opening / closing valve 10C is closed when C is open, and the control means 30 for controlling the second opening / closing valve 10C to be open when the first opening / closing valve 20C is closed, the control means 30 is provided. A heat pump hot water supply system that is thin and has a small installation space can be provided by connecting multiple thin hot water storage tanks, and the hot water in the hot water storage tank is heated preferentially, so a heat pump hot water supply with excellent hot water System can be provided.

Even if a plurality of hot water storage tanks are connected in parallel by piping, it is possible to switch the hot water storage tanks to be heated, and similar effects can be obtained.
If the hot water in the hot water storage tank on the hot water supply side is preferentially heated by connecting the pipes in series as in this embodiment, a heat pump hot water supply system having excellent hot water supply property can be obtained. Further, by using the oxygen dioxide refrigerant in the heat pump refrigerant circuit, even if the refrigerant is released into the atmosphere, problems such as destruction of the ozone layer do not occur, which is safe.

[0040]

As described above, according to the invention of claim 1, a heat pump refrigerant circuit composed of a compressor, a refrigerant-to-water heat exchanger, a pressure reducer and an evaporator, and the refrigerant pair. First and second hot water storage tanks connected in series to the water heat exchanger, a hot water supply pipe for supplying hot water from the first hot water storage tank to the utilization section, the second hot water storage tank, and a refrigerant-to-water heat exchanger A pipe between the first on-off valve and the circulation pump that bypasses the second hot water storage tank and the first on-off valve and the circulation pump that are interposed in the middle of the pipe that connects To the bypass pipe, the second opening / closing valve interposed in the bypass pipe, the second opening / closing valve is closed when the first opening / closing valve is open, and the second opening / closing valve is closed when the first opening / closing valve is closed. Since it is a configuration including a control means for controlling the on-off valve to open,
By installing multiple hot water storage tanks with a small diameter, a heat pump hot water supply system that is thin and has a small installation space can be provided. A heat pump hot water supply system can be provided.

According to the invention described in claim 2, a compressor,
A heat pump refrigerant circuit composed of a refrigerant-to-water heat exchanger, a pressure reducer and an evaporator; first and second hot water storage tanks connected in series to the refrigerant-to-water heat exchanger;
A hot water supply pipe for supplying hot water from the hot water storage tank to the utilization section, a temperature sensor provided in the first hot water storage tank, and a pipe that connects the second hot water storage tank and the refrigerant-to-water heat exchanger. A bypass pipe that bypasses the first on-off valve and the circulation pump and the second hot water storage tank and connects the first hot water storage tank to a pipe between the first on-off valve and the circulation pump; A control means for controlling the mounted second opening / closing valve and closing the second opening / closing valve when the first opening / closing valve is open and opening the second opening / closing valve when the first opening / closing valve is closed. And the control means, when the temperature sensor provided in the first hot water storage tank has a predetermined temperature or higher,
Since the configuration is such that the first on-off valve is closed and the second on-off valve is opened, in addition to the effect of claim 1, the hot water in the hot water storage tank on the hot water supply side is heated more efficiently, so that the hot water can be quickly heated. An excellent heat pump hot water supply system can be provided.

The inventions described in claims 3 and 4 are defined by claim 1.
Alternatively, the configuration according to claim 2 is provided with rotation speed control means for controlling the rotation speed of the compressor of the heat pump refrigerant circuit and opening degree control means for controlling the opening degree of the pressure reducer.
Alternatively, in addition to the effect of 2, the time for boiling the hot water can be adjusted, and efficient operation is possible.

Further, according to the invention of claim 5,
Since a carbon dioxide refrigerant is used in the heat pump refrigerant circuit, even if the refrigerant is released into the atmosphere, problems such as destruction of the ozone layer do not occur and it is safe.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heat pump hot water supply system showing an embodiment of the present invention.

FIG. 2 is a control block diagram of the heat pump hot water supply system showing the embodiment of the present invention.

FIG. 3 is a flowchart showing an example of boiling according to the embodiment of the present invention.

FIG. 4 is a configuration diagram of a heat pump hot water supply system showing a flow of water when boiling two hot water storage tanks according to the embodiment of the present invention.

FIG. 5 is a configuration diagram of a heat pump hot water supply system showing a flow of water when boiling one first hot water storage tank according to the embodiment of the present invention.

FIG. 6 is a configuration diagram of a conventional heat pump hot water supply system.

[Explanation of symbols]

10 1st hot water storage tank 10B opening / closing valve (4th opening / closing valve) 10C opening / closing valve (2nd opening / closing valve) 13H hot water supply pipe 11H bypass pipe 20 2nd hot water storage tank 20B opening / closing valve (3rd opening / closing valve) 20C opening / closing valve (1st opening / closing) 22H Circulation piping (piping) 30 Water heater control device (control means) 31 Heat pump refrigerant circuit control device (rotation speed control means and opening control means) 4 Faucet (use part) 5 Circulation pump 6 Refrigerant-to-water heat exchanger A hot water supply circuit B heat pump refrigerant circuit 2A temperature sensor A1 compressor A3 pressure reducer A4 evaporator R refrigerant flow

Claims (5)

[Claims] 1. A heat pump refrigerant circuit composed of a compressor, a refrigerant-to-water heat exchanger, a pressure reducer and an evaporator, and first and first pipe-connected to the refrigerant-to-water heat exchanger in series. 2 a hot water storage tank, a hot water supply pipe for supplying hot water from the first hot water storage tank to the utilization section, and a first opening / closing valve interposed in the middle of a pipe connecting the second hot water storage tank and the refrigerant-to-water heat exchanger, A bypass pipe that bypasses the circulation pump and the second hot water storage tank and connects the first hot water storage tank to a pipe between the first opening / closing valve and the circulation pump; and a second pipe interposed in the bypass pipe. An opening / closing valve; and a control means for controlling the second opening / closing valve to be closed when the first opening / closing valve is opened and to open the second opening / closing valve when the first opening / closing valve is closed. A heat pump hot water supply system. 2. A heat pump refrigerant circuit comprising a compressor, a refrigerant-to-water heat exchanger, a decompressor and an evaporator, and first and first pipes connected in series to the refrigerant-to-water heat exchanger. 2 hot water storage tank, hot water supply pipe for supplying hot water of the first hot water storage tank to the utilization portion, temperature sensor provided in the first hot water storage tank, and piping for connecting the second hot water storage tank and the refrigerant-to-water heat exchanger A bypass pipe for bypassing the first on-off valve and the circulation pump and the second hot water storage tank, which are interposed in the middle of the path, and connecting the first hot water storage tank to a pipe between the first on-off valve and the circulation pump. And a second interposing on this bypass pipe
An opening / closing valve; and a control means for controlling the second opening / closing valve to close when the first opening / closing valve is open and to open the second opening / closing valve when the first opening / closing valve is closed, The control means is configured to close the first opening / closing valve and open the second opening / closing valve when the temperature sensor provided in the first hot water storage tank has a predetermined temperature or higher. Heat pump hot water supply system. 3. A heat pump refrigerant circuit composed of a compressor, a refrigerant-to-water heat exchanger, a decompressor and an evaporator, and first and first pipes connected in series to the refrigerant-to-water heat exchanger. 2 a hot water storage tank, a hot water supply pipe for supplying hot water from the first hot water storage tank to the utilization section, and a first opening / closing valve interposed in the middle of a pipe connecting the second hot water storage tank and the refrigerant-to-water heat exchanger, A bypass pipe that bypasses the circulation pump and the second hot water storage tank and connects the first hot water storage tank to a pipe between the first opening / closing valve and the circulation pump; and a second pipe interposed in the bypass pipe. An on-off valve, control means for controlling the second on-off valve to close when the first on-off valve is open, and to open the second on-off valve when the first on-off valve is closed; and the compressor. And a rotation speed control means for controlling the rotation speed of the heat pump hot water supply system. Stem. 4. A heat pump refrigerant circuit comprising a compressor, a refrigerant-to-water heat exchanger, a pressure reducer and an evaporator, and first and first pipe-connected pipes connected in series to the refrigerant-to-water heat exchanger. 2 a hot water storage tank, a hot water supply pipe for supplying hot water from the first hot water storage tank to the utilization section, and a first opening / closing valve interposed in the middle of a pipe connecting the second hot water storage tank and the refrigerant-to-water heat exchanger, A bypass pipe that bypasses the circulation pump and the second hot water storage tank and connects the first hot water storage tank to a pipe between the first opening / closing valve and the circulation pump; and a second pipe interposed in the bypass pipe. And an opening / closing heat pump refrigerant circuit valve, and control means for controlling the second opening / closing valve to be closed when the first opening / closing valve is open and to open the second opening / closing valve when the first opening / closing valve is closed. And an opening control means for controlling the opening of the decompressor. Heat pump hot water supply system. 5. The heat pump hot water supply system according to claim 1, wherein carbon dioxide refrigerant is used in the heat pump refrigerant circuit.