WO2010041653A1 - Hot water system - Google Patents

Abstract

Hot water produced by heating by means of a heat pump unit (1) is stored in a hot water storage tank (2).  A hot water supplying heat exchanger (3) in which hot water to be supplied flows from below upward in the heat exchanger (3) is provided in the hot water storage tank (2).  An intermediate section of the hot water supplying heat exchanger (3) in the top-bottom direction is connected to a second hot water supply connection opening (18) in the hot water storage tank (2).  The configuration allows hot water to be supplied which flows from the lower part of the hot water supplying heat exchanger (3) up to the intermediate section to be taken out of the hot water supply tank (2) from the second hot water supply connection opening (18).

Description

Hot water system

The present invention relates to a hot water system such as a hot water supply device or a heating hot water supply device.

Conventionally, as a hot water supply apparatus, there is one disclosed in Japanese Patent Application Laid-Open No. 2004-232914 (Patent Document 1).

This heating and hot water supply apparatus includes a heat pump, a hot water storage tank that stores hot water heated by the heat pump, a heat exchanger that is disposed only in an upper portion of the hot water storage tank, and a heater that is connected to the heat exchanger. I have.

The low temperature water stored in the lower part of the hot water storage tank is supplied to the heat pump unit. This low-temperature water is heated by the heat pump unit and then sent into the upper part of the hot water storage tank.

A faucet is connected to the upper part of the hot water storage tank via a hot water supply pipe. When this faucet is opened, high-temperature water in the upper part of the hot water storage tank is discharged from the faucet through the hot water supply pipe.

A water supply pipe is connected to the lower part of the hot water storage tank. Water is supplied into the hot water storage tank from this water supply pipe, and the amount of water in the hot water storage tank is kept constant.

The above heater performs heating operation using high temperature water in the upper part of the hot water storage tank. More specifically, when the heating operation is started, the heat medium in the heat exchanger is heated by the heat of the high-temperature water in the upper part of the hot water storage tank. And the said heat medium is sent to a heater, and the heat | fever of the heat medium is discharge | released indoors through a heater.

By the way, in the said conventional heating hot-water supply apparatus, since the heat exchanger is arrange | positioned only in the upper part of a hot water storage tank, in order to fully heat the heat medium in a heat exchanger, the hot water temperature in the upper part of a hot water storage tank is used. Is preferably high.

Also, from the viewpoint of improving the COP (coefficient of performance) of the heat pump unit by supplying low-temperature water to the heat pump unit, it is preferable to lower the hot water temperature in the lower part of the hot water storage tank.

Therefore, it is ideal that the hot water temperature in the upper part of the hot water storage tank is high and the hot water temperature in the lower part of the hot water storage tank is low.

However, the conventional heating and hot water supply apparatus has a problem that when hot water is discharged from the faucet, the temperature of the hot water in the upper part of the hot water storage tank is lowered, so that the ideal temperature distribution in the hot water storage tank is destroyed.

Also, when the faucet is opened, there is a problem that the hot water stored in the hot water storage tank is wasted because hot water is discharged from the faucet even if hot water is not required.

JP 2004-232914 A

Therefore, an object of the present invention is to provide a hot water system that can keep the temperature distribution in the hot water storage tank in an ideal state and can reduce wasteful heat loss.

In order to solve the above problems, the hot water system of the present invention is:
A heat pump unit;
A hot water storage tank for storing hot water heated by the heat pump unit;
A heat exchanger disposed in the hot water storage tank, in which water flows from the bottom toward the top in the interior;
It is connected to the intermediate part of the said heat exchanger in the up-down direction, The intermediate part hot-water part for drawing out the water in the said intermediate part out of the said hot water storage tank is provided.

According to the hot water system having the above configuration, when the water in the heat exchanger is drawn out of the hot water storage tank by the intermediate hot water outlet, the water flows from the lower part of the heat exchanger to the intermediate part in the vertical direction, Absorbs the heat of warm water in the bottom of the. As a result, the temperature of the hot water in the lower part of the hot water storage tank can be lowered.

In addition, when the water in the heat exchanger is drawn out of the hot water storage tank by the intermediate hot water outlet, the amount of water flowing from the intermediate portion in the vertical direction of the heat exchanger to the upper portion is reduced, and the water flows in the upper portion of the hot water storage tank. The amount of heat taken away from the hot water can be reduced. That is, the temperature of the hot water in the upper part of the hot water storage tank can be kept higher than the temperature of the hot water in the lower part of the hot water storage tank.

Therefore, when the water in the heat exchanger is drawn out of the hot water storage tank by the intermediate hot water outlet, the hot water temperature in the upper part of the hot water storage tank is high and the hot water temperature in the lower part of the hot water storage tank can be lowered. .

Further, when the water in the heat exchanger is drawn out of the hot water storage tank by the intermediate hot water outlet, the heat exchange between the hot water in the upper part of the hot water tank and the water in the heat exchanger can be reduced. Wasteful heat loss of hot water stored inside can be reduced.

The hot water system of one embodiment is
An upper hot water outlet for taking the water in the upper part of the heat exchanger out of the hot water storage tank;
And a switching unit that switches the hot water between the upper hot water source and the intermediate hot water source.

According to the hot water system of the above embodiment, when the water in the upper part of the heat exchanger is drawn out of the hot water storage tank by the upper hot water outlet, the water flows from the lower part to the upper part of the heat exchanger. Can be raised.

In addition, if the water entered in the heat exchanger is prevented from flowing into the upper hot water outlet by switching the hot water of the switching section, maintenance of the upper hot water outlet can be performed even when the intermediate hot water outlet is in use. Can do.

In one embodiment of the hot water system,
The switching unit is a three-way valve that communicates with the upper hot water outlet and the intermediate hot water outlet.

According to the hot water system of the above embodiment, since the switching unit is a three-way valve that communicates with the upper tapping unit and the middle tapping unit, the tapping between the upper tapping unit and the middle tapping unit is easily and reliably switched. be able to.

In one embodiment of the hot water system,
The three-way valve is disposed outside the hot water storage tank.

According to the hot water system of the above embodiment, since the three-way valve is disposed outside the hot water storage tank, the three-way valve can be easily maintained.

The hot water system of one embodiment is
A temperature sensor for detecting the temperature of hot water in the intermediate portion in the hot water storage tank;
A control device for controlling the switching unit based on the temperature detected by the temperature sensor;
The control device
A temperature determination unit that determines whether the temperature detected by the temperature sensor is equal to or higher than a target temperature;
A switching control unit for controlling the switching unit so that the hot water is discharged by the intermediate hot-water unit when the temperature determination unit determines that the temperature detected by the temperature sensor is equal to or higher than the target temperature; Have.

According to the hot water system of the embodiment, the temperature determination unit determines whether or not the temperature detected by the temperature sensor is equal to or higher than the target temperature. Then, when the temperature determination unit determines that the temperature detected by the temperature sensor is equal to or higher than the target temperature, the switching control unit controls the switching unit so that the hot water is discharged by the intermediate hot water supply unit.

Thus, by controlling the switching unit by the switching control unit, it is possible to reliably prevent wasteful use of the heat of the hot water in the upper part of the hot water storage tank.

In one embodiment of the hot water system,
The hot water in the lower part of the hot water storage tank is sent to the heat pump unit, and the hot water heated by the heat pump unit is returned to the upper part of the hot water storage tank.

According to the hot water system of the above embodiment, the hot water in the lower part of the hot water storage tank is sent to the heat pump unit. Since the temperature of the hot water in the lower part of the hot water storage tank can be lowered, the COP of the heat pump unit can be improved.

Also, since the hot water heated by the heat pump unit is returned to the upper part of the hot water storage tank, the temperature of the hot water in the upper part of the hot water storage tank can be raised.

In one embodiment of the hot water system,
In the heat exchanger, the length of the portion below the portion connected to the intermediate hot water outlet is longer than the length of the portion above the portion connected to the intermediate hot water outlet. Is formed.

According to the hot water system of the above-described embodiment, the heat exchanger has a portion that is lower than a location connected to the intermediate hot-water supply portion, and is longer than a location connected to the intermediate hot-water supply portion. Since it is formed so as to be longer than the length of the portion, the water in the heat exchanger passes through the portion below the portion connected to the intermediate hot water supply portion while the hot water in the hot water storage tank Can sufficiently absorb the heat.

Therefore, the temperature of the water in the heat exchanger drawn out of the hot water storage tank by the intermediate hot water outlet can be increased.

In one embodiment of the hot water system,
The lower part of the heat exchanger is arranged over the entire vertical direction in the lower part of the hot water storage tank.

According to the hot water system of the above embodiment, the lower part of the heat exchanger is arranged over the entire vertical direction in the lower part of the hot water tank, so that it sufficiently absorbs the heat of the hot water in the lower part of the hot water tank, The temperature of the hot water can be sufficiently reduced.

In one embodiment of the hot water system,
A circulation circuit is provided for circulating the hot water stored in the hot water storage tank through the heating terminal outside the hot water storage tank and then returning it to the hot water storage tank.

According to the hot water system of the above embodiment, when the heating operation is started, the hot water stored in the hot water storage tank flows to the heating terminal through the circulation circuit and returns to the hot water storage tank again, so that the heat of the hot water passes through the heating terminal. Released into the room. That is, the heating terminal directly takes out the heat of the hot water in the hot water storage tank and releases it into the room.

Therefore, since the heat of the hot water in the hot water storage tank can be efficiently supplied to the heating terminal, sufficient heating can be performed even in an area with a high heating load such as Northern Europe.

In one embodiment of the hot water system,
The refrigerant used in the heat pump unit is a CO ₂ refrigerant.

According to the hot water system of the above embodiment, the heat pump unit uses a CO ₂ refrigerant, so that the heat pump unit can perform hot hot water discharge.

In one embodiment of the hot water system,
The water flowing from the bottom to the top in the heat exchanger is hot water.

According to the hot water system of the above embodiment, when the hot water in the heat exchanger is drawn out of the hot water storage tank by the intermediate hot water outlet, the hot water is only from the lower part of the heat exchanger to the middle part in the vertical direction. Since it does not flow, the temperature does not rise so much and the risk of burns to the user is low.

In one embodiment of the hot water system,
In the hot water storage tank, a heater is provided at a substantially central portion in the vertical direction.

According to the hot water system of the above embodiment, for example, when the outside air is low or when the amount of heat in the hot water storage tank is rapidly consumed, the hot water in the hot water storage tank cannot be sufficiently boiled with only the heat pump unit. is there. In such a case, the hot water in the hot water storage tank can be sufficiently boiled by using the heater and the heat pump unit in combination or using only the heater.

In addition, since the heater is located at a substantially central portion in the vertical direction in the hot water storage tank, the hot water in the upper part of the hot water storage tank can be positively heated rather than the hot water in the lower part of the hot water storage tank.

Therefore, the temperature of the hot water in the upper part of the hot water storage tank can be kept higher than the temperature of the hot water in the lower part of the hot water storage tank.

Moreover, when the water in the heat exchanger is drawn out of the hot water storage tank by the intermediate hot water outlet, the temperature of the hot water in the upper part of the hot water storage tank can be kept higher than the temperature of the hot water in the lower part of the hot water storage tank. Therefore, it is not necessary to heat the hot water in the upper part of the hot water storage tank with a heater.

As a result, the use frequency of the heater can be reduced and energy saving can be achieved.

In one embodiment of the hot water system,
A bathtub that is supplied with water whose temperature has risen through the heat exchanger,
The water in the bathtub can be drawn out of the bathtub, flowed into the heat exchanger, and returned to the bathtub again.

According to the hot water system of the above embodiment, the water in the bathtub is drawn out of the bathtub, flows into the heat exchanger, and can be returned to the bathtub again. can do.

According to the hot water system of the present invention, since the intermediate hot water outlet is connected to the intermediate portion in the vertical direction of the heat exchanger, when the water in the heat exchanger is drawn out of the hot water storage tank from the intermediate hot water outlet, The water in the exchanger absorbs the heat of the hot water in the lower part of the hot water tank, and as a result, the temperature of the hot water in the lower part of the hot water tank can be lowered.

In addition, since the intermediate hot water outlet is connected to the vertical intermediate portion of the heat exchanger, when the water in the heat exchanger is drawn out of the hot water storage tank from the intermediate hot water outlet, the vertical direction of the heat exchanger is The amount of water flowing from the middle part to the upper part is reduced, and the temperature of the hot water in the upper part of the hot water storage tank can be kept higher than the temperature of the hot water in the lower part of the hot water storage tank.

Therefore, when the water in the heat exchanger is drawn out of the hot water storage tank from the intermediate hot water outlet, the hot water temperature in the upper part of the hot water storage tank is high and the hot water temperature in the lower part of the hot water storage tank can be lowered.

In addition, if the water in the heat exchanger is drawn out of the hot water storage tank from the intermediate hot water outlet, heat exchange between the hot water in the upper part of the hot water tank and the water in the heat exchanger can be reduced. Wasteful heat loss of hot water stored in the water can be reduced.

FIG. 1 is a schematic diagram of a hot water supply apparatus according to a first embodiment of the present invention. FIG. 2 is a flowchart of hot water supply control of the hot water supply apparatus. FIG. 3 is a flowchart of hot water supply control of the hot water supply apparatus. FIG. 4 is a schematic view of a modification of the hot water supply apparatus according to the first embodiment of the present invention. FIG. 5 is a schematic view of a modification of the hot water supply apparatus according to the first embodiment of the present invention. FIG. 6 is a schematic view of a modified example of the hot water supply apparatus according to the first embodiment of the present invention. FIG. 7 is a schematic diagram of a heating and hot water supply apparatus according to a second embodiment of the present invention. FIG. 8 is a schematic view of a bath water heater of a third embodiment of the present invention. FIG. 9 is a schematic view of a bath water heater of a third embodiment of the present invention. FIG. 10 is a schematic view of a bath water heater of a third embodiment of the present invention.

Hereinafter, the hot water system of the present invention will be described in detail with reference to the illustrated embodiments.

[First Embodiment]
Drawing 1 is a mimetic diagram showing composition of a hot-water supply device of a 1st embodiment of the present invention.

The hot water supply apparatus includes a heat pump unit 1, a hot water storage tank 2 for storing hot water heated by the heat pump unit 1, and a hot water supply heat exchanger 3 disposed from the lower part to the upper part of the hot water storage tank 2. ing. Here, the lower part of the hot water storage tank 2 corresponds to a lowermost part when the hot water storage tank 2 is divided into three equal parts in the vertical direction. The upper part of the hot water storage tank 2 corresponds to the uppermost part when the hot water storage tank 2 is divided into three equal parts in the vertical direction. The hot water supply heat exchanger 3 is an example of a heat exchanger.

The heat pump unit 1 is supplied with hot water in the lower part of the hot water storage tank 2 from the boiling supply port 15. When the hot water is sufficiently heated by the heat pump unit 1, it is returned from the boiling return port 16 into the upper part of the hot water storage tank 2. Thereby, the temperature of the hot water in the upper part of the hot water storage tank 2 can be raised. Although not shown, the heat pump unit 1 has a refrigerant circuit and an evaporator, a compressor, a condenser, and an expansion mechanism provided in the refrigerant circuit. The refrigerant circulating in the refrigerant circuit is a CO ₂ refrigerant.

Between the heating supply port 15 for heating and the heat pump unit 1, a circulating pump 4 for heating is installed. The starting and stopping of the boiling circulation pump 4 is controlled by the control unit 10. The control unit 10 is an example of a control device.

Between the heating return port 16 and the heat pump unit 1, a boiling three-way valve 5 is installed. In the boiling three-way valve 5, when the heat pump unit 1 is started up, the hot water coming out of the heat pump unit 1 is not sufficiently hot, so that the hot water is passed through the antifreezing water return port 30 into the lower part of the hot water storage tank 2. Shed. Thereby, it is possible to prevent the hot water that has not been sufficiently heated by the heat pump unit 1 from returning to the upper part of the hot water storage tank 2 and disturbing the temperature distribution in the hot water storage tank 2.

A heater 6 is disposed at a substantially central portion in the vertical direction in the hot water storage tank 2. As a result, the hot water in the hot water storage tank 2 can be directly heated by the heater 6 and the temperature of the hot water in the hot water storage tank 2 can be quickly raised.

The first tank thermistor 7, the second tank thermistor 8, and the third tank thermistor 9 are provided on the inner wall of the hot water storage tank 2. Here, the first tank thermistor 7, the second tank thermistor 8 and the third tank thermistor 9 are provided on the inner wall of the hot water storage tank 2, but may be provided on the outer wall of the hot water storage tank 2, for example. In short, the installation location of the first tank thermistor 7, the second tank thermistor 8 and the third tank thermistor 9 is not limited to the inner wall of the hot water storage tank 2. The second tank thermistor 8 is an example of a temperature sensor.

The first tank thermistor 7 detects the temperature of the hot water in the lower part of the hot water storage tank 2 and sends a signal indicating the temperature to the control unit 10.

The second tank thermistor 8 detects the temperature of hot water in the middle portion of the hot water storage tank 2 in the vertical direction, and sends a signal indicating the temperature to the control unit 10. Here, the intermediate portion in the vertical direction of the hot water storage tank 2 corresponds to a portion between the uppermost portion and the lowermost portion when the hot water storage tank 2 is divided into three equal parts in the vertical direction. .

The third tank thermistor 9 detects the temperature of the hot water in the upper part of the hot water storage tank 2 and sends a signal indicating the temperature to the control unit 10.

The hot water storage tank 2 is provided with a first hot water connection port 17, a second hot water connection port 18, a third hot water connection port 19, and a fourth hot water connection port 20. In addition, the said 2nd hot-water supply connection port 18 is an example of an intermediate part hot-water supply part, and the 4th hot-water supply connection port 20 is an example of an upper hot-water supply part.

The first hot water supply connection port 17 is provided at the lower part of the hot water storage tank 2 to introduce hot water (city water) in the hot water supply pipe 21 into the lower part of the hot water supply heat exchanger 3, and also for the hot water supply heat exchanger 3. Connected to the bottom of the.

The second hot water supply connection port 18 is provided at the intermediate portion in the vertical direction of the hot water storage tank 2 in order to draw hot water in the intermediate portion in the vertical direction of the heat exchanger 3 for hot water supply to the outside of the hot water storage tank 2. It is connected to the middle part of the exchanger 3 in the vertical direction.

The third hot water supply connection port 19 is provided at an intermediate portion in the vertical direction of the hot water storage tank 2 in order to return hot water discharged from the second hot water supply connection port 18 to the hot water storage tank 2 again. It is connected to the middle part in the vertical direction of the heat exchanger 3 for hot water supply.

The fourth hot water supply connection port 20 is provided at the upper portion of the hot water storage tank 2 and is connected to the upper portion of the hot water supply heat exchanger 3 in order to draw hot water in the upper portion of the hot water heat exchanger 3 out of the hot water storage tank 2. Has been.

The heat exchanger 3 for hot water supply is composed of a coiled pipe, and hot water flows from the bottom upward. More specifically, hot water in the water supply pipe 21 enters the lower part of the hot water supply heat exchanger 3 through the first hot water supply connection port 17 and flows upward. And the hot water which reached the intermediate part of the up-down direction of the said hot water supply heat exchanger 3 comes out of the hot water storage tank 2 from the 2nd hot water supply connection port 18, Then, the 1st drawer | drawing-out piping 22 and the hot water supply three-way valve 11 are made Then, it flows into the first outlet pipe 23 or the return pipe 25.

When the hot water supplied from the second hot water supply connection port 18 flows into the first hot water supply pipe 23, the hot water reaches the faucet 14 through the hot water mixing valve 12 and the second hot water supply pipe 24.

On the other hand, when the hot water discharged from the second hot water supply connection port 18 flows into the return pipe 25, the hot water returns to the hot water storage tank 2 from the third hot water connection port 19, and the upper part of the hot water supply heat exchanger 3. After passing through the fourth hot water supply connection port 20 again and out of the hot water storage tank 2, it passes through the second draw-out pipe 26, the first hot water supply pipe 23, the hot water supply mixing valve 12 and the second hot water supply pipe 24 to the faucet 14. To reach.

The hot water supply three-way valve 11 is installed outside the hot water storage tank 2. Depending on whether the three ports of the hot water supply three-way valve 11 are open or closed, whether hot water discharged from the second hot water connection port 18 to the outside of the hot water storage tank 2 flows into the first hot water discharge pipe 23 or the return pipe 25 Will be determined. One of the three ports of the hot water supply three-way valve 11 is connected to the second hot water supply connection port 18 via the first lead pipe 22 and communicates with the second hot water supply connection port 18. The other one of the three ports is connected to the third hot water supply connection port 19 through the return pipe 25 and communicates with the fourth hot water supply connection port 20. The remaining one of the three ports is connected to the hot water supply mixing valve 12 via the first hot water supply pipe 23. The hot water supply three-way valve 11 is an example of a switching unit.

The hot water mixing valve 12 has an inlet through which hot water from the first hot water supply pipe 23 flows and an inlet through which hot water from the bypass pipe 27 flows. The opening degree of each inlet of the hot water mixing valve 12 is adjusted by the control unit 10. Thereby, the hot water in the said 1st hot water piping 23 and the hot water in the bypass piping 27 can be mixed by a desired ratio.

The hot water supply thermistor 13 is attached to the second hot water supply pipe 24. This hot water supply thermistor 13 detects the temperature of hot water flowing through the second hot water supply pipe 24 and sends a signal indicating the temperature to the control unit 10.

The controller 10 controls the opening degree of each inlet of the hot water supply mixing valve 12 based on a signal from the hot water supply thermistor 13, and hot water in the first hot water supply pipe 23 and hot water in the water supply pipe 21. Or not. The control unit 10 controls the open / close state of the three ports of the hot water supply three-way valve 11 based on a signal from the second tank thermistor 8.

Hereinafter, the hot water supply control of the hot water supply apparatus will be described with reference to FIGS. 2 and 3.

First, as shown in FIG. 2, it is determined in step S1 whether or not the user has set or changed the hot water supply set temperature. This step S1 is repeated until it is determined that the hot water supply temperature has been set / changed by the user. The hot water supply set temperature set / changed by the user is an example of the target temperature.

Next, in step S2, based on the signal output from the second tank thermistor 8, the hot water temperature in the intermediate portion in the vertical direction of the hot water storage tank 2 (the hot water temperature in the tank intermediate portion) is set / changed. It is determined whether or not the temperature is higher. If it is determined in step S2 that the temperature of the hot water in the intermediate portion in the vertical direction of the hot water storage tank 2 is equal to or higher than the set / changed hot water supply temperature, the process proceeds to the next step S3. On the other hand, if it is determined in step S2 that the temperature of the hot water in the intermediate portion in the vertical direction of the hot water storage tank 2 is not equal to or higher than the set / changed hot water supply temperature, the process goes to steps S9 and S12 to be described later. move on.

In step S11, the hot water supply three-way valve 11 causes the hot water that has flowed out of the hot water storage tank 2 through the second hot water supply connection port 18 to flow into the return pipe 25.

In step S12, hot water supply is started. That is, hot water is introduced into the lower part of the hot water supply heat exchanger 3 from the first hot water supply connection port 17. The hot water drawn from the fourth hot water supply connection port 20 flows into the first hot water supply pipe 23 via the second draw pipe 26, and this hot water is heated with substantially all of the hot water in the hot water storage tank 2. The temperature has risen sufficiently because of replacement. As a result, when the faucet 14 is opened, a relatively high temperature hot water is discharged from the faucet 14.

When the process proceeds from step S2 to step S3, the hot water supply three-way valve 11 causes the hot water supplied from the second hot water supply connection port 18 to the outside of the hot water storage tank 2 to flow into the first hot water supply pipe 23.

Next, in step S4, hot water is introduced into the lower portion of the hot water supply heat exchanger 3 from the first hot water supply connection port 17, and hot water supply is started. The hot water drawn from the second hot water supply connection port 18 directly flows into the first hot water supply pipe 23 without returning to the hot water storage tank 2, and the hot water is supplied from the second hot water supply connection port 18 of the hot water storage tank 2. However, only the hot water in the lower part is exchanging heat, so the temperature is only slightly increased. Accordingly, when the faucet 14 is opened, a relatively low temperature hot water is discharged from the faucet 14.

Next, in step S5, the opening degree of each inlet of the hot water supply mixing valve 12 is adjusted based on the hot water supply temperature set and changed by the user and the signal from the hot water supply thermistor 13.

Next, in step S6, it is determined whether or not the hot water supply mixing valve 12 is fully opened. That is, it is determined whether or not the inlet on the first hot water supply pipe 23 side of the hot water supply mixing valve 12 is fully opened and the inlet on the bypass pipe 27 side of the hot water supply mixing valve 12 is fully closed. If it is determined in step S6 that the above state has been established, the process proceeds to the next step S7. On the other hand, if it is determined in step S6 that the above state is not established, the process returns to step S5.

Next, as shown in FIG. 3, in step S7, it is determined whether or not the temperature (hot water supply temperature) indicated by the output signal of the hot water supply thermistor 13 is lower than the set / changed hot water supply set temperature. If it is determined in step S7 that the hot water supply temperature is lower than the set / changed hot water supply temperature, the process proceeds to the next step 8. On the other hand, when it is determined that the hot water supply temperature is not lower than the set / changed hot water supply temperature, the process returns to step S5.

Next, in step S8, the hot water supply three-way valve 11 causes the hot water that has flowed out of the hot water storage tank 2 through the second hot water supply connection port 18 to flow into the return pipe 25.

Next, in step S9, based on the hot water supply temperature set / changed by the user and the signal from the hot water supply thermistor 13, the opening of each inlet of the hot water supply mixing valve 12 is adjusted.

Next, in step S10, the introduction of hot water into the lower part of the hot water supply heat exchanger 3 is stopped, and the hot water supply is terminated.

That is, in the first embodiment, step S2 is an example of a temperature determination unit, and steps S3 and S11 are an example of a switching control unit.

As described above, when the hot water drawn from the second hot water supply connection port 18 is directly introduced into the first hot water supply pipe 23 by the hot water supply three-way valve 11, the hot water is supplied from the second hot water supply connection port 18. Since the heat of the hot water on the side is absorbed, the temperature of the hot water in the lower part of the hot water storage tank 2 can be lowered.

When hot water drawn from the second hot water supply connection port 18 is directly introduced into the first hot water supply pipe 23 by the three-way valve 11 for hot water supply, the hot water is hot water above the second hot water supply connection port 18. Therefore, the temperature of the hot water in the upper part of the hot water storage tank 2 can be prevented from being lowered.

Therefore, when hot water drawn from the second hot water connection port 18 is directly flowed into the first hot water supply pipe 23 by the hot water supply three-way valve 11, the hot water temperature in the upper part of the hot water storage tank 2 is relatively high, and The hot water temperature in the lower part of the hot water storage tank 2 can be lowered.

When hot water drawn from the second hot water connection port 18 is directly flowed into the first hot water supply pipe 23 by the three-way valve 11 for hot water supply, the hot water is supplied from the second hot water connection port 18 of the hot water storage tank 2. In addition, since the heat of the hot water in the upper portion is not absorbed, useless heat loss of the hot water stored in the hot water storage tank 2 can be reduced.

When the hot water drawn from the second hot water connection port 18 is directly introduced into the first hot water supply pipe 23 by the three-way valve 11 for hot water supply, the hot water is supplied from the second hot water connection port 18 to the hot water on the lower side. Therefore, the temperature does not rise so much and the risk of burns to the user is low.

Moreover, since the hot water supply absorbs the heat of the hot water on the lower side from the second hot water supply connection port 18, the temperature of the hot water decreases. As a result, since the warm water whose temperature has been lowered is sent to the heat pump unit 1 by the boiling circulation pump 4, the COP of the heat pump unit 1 can be improved.

Moreover, since the hot water drawn from the fourth hot water supply connection port 20 flows from the lower part to the upper part of the hot water supply heat exchanger 3, the temperature can be sufficiently raised.

In addition, when the hot water drawn from the second hot water connection port 18 is directly flowed into the first hot water supply pipe 23 by the three-way valve 11 for hot water supply, the fourth hot water connection port even during the hot water is being discharged. 20 maintenances can be performed.

Moreover, the three-way valve 11 for hot water supply can easily and reliably switch between the low temperature hot water supply through the second hot water supply connection port 18 and the high temperature hot water supply through the fourth hot water supply connection port 20.

Further, since the three-way valve 11 for hot water supply is installed outside the hot water storage tank 2, the three-way valve 11 for hot water supply can be easily maintained.

In addition, since the heater 6 is arranged at the substantially central portion in the vertical direction in the hot water storage tank 2, even when the hot water in the hot water storage tank 2 cannot be sufficiently boiled only by the heat pump unit 1, the heater 6 and the heat pump unit. 1, the hot water in the hot water storage tank 2 can be sufficiently boiled using at least the heater 6.

In addition, since the heater 6 is positioned at a substantially central portion in the vertical direction in the hot water storage tank 2, the hot water in the upper part of the hot water storage tank 2 can be positively heated rather than the hot water in the lower part of the hot water storage tank 2. .

Therefore, the temperature of the hot water in the upper part of the hot water storage tank 2 can be kept higher than the temperature of the hot water in the lower part of the hot water storage tank 2.

Further, when hot water in the middle portion in the vertical direction of the hot water supply heat exchanger 3 is drawn out of the hot water storage tank 2 without passing through the upper portion in the vertical direction of the hot water supply heat exchanger 3, Since the temperature of the hot water can be kept higher than the temperature of the hot water in the lower part of the hot water storage tank 2, it is not necessary to heat the hot water in the upper part of the hot water storage tank 2 with the heater 6.

As a result, the use frequency of the heater 6 can be reduced and energy saving can be achieved.

In the first embodiment, the three-way valve 11 for hot water supply is installed outside the hot water storage tank 2, but it may be installed inside the hot water storage tank 2.

In the first embodiment, the hot water supply heat exchanger 3 is arranged in the hot water storage tank 2, but the hot water supply heat exchanger 103 shown in FIG. 4 may be arranged. The hot water supply heat exchanger 103 is an example of a heat exchanger.

The hot water storage heat exchanger 3 is such that the length of the portion below the portion connected to the second hot water supply connection port 18 is higher than the portion connected to the second hot water supply connection port 18. It is formed to be substantially the same.

On the other hand, in the heat exchanger 103 for hot water supply, the length of the portion below the location connected to the second hot water supply connection port 18 is higher than the location connected to the second hot water supply connection port 18. It is formed so that it may become longer than the length of the part in.

Therefore, the temperature of the hot water flowing from the lower end of the hot water supply heat exchanger 103 to the second hot water supply connection port 18 can be made sufficiently high.

Moreover, since the part below the location connected to the second hot water supply connection port 18 is arranged over substantially the entire vertical direction in the lower part of the hot water storage tank 2, the hot water in the lower part of the hot water storage tank 2 is disposed. The temperature can be lowered sufficiently.

In FIG. 4, the same components as those shown in FIG. 1 are denoted by the same reference numerals as the components shown in FIG.

In the first embodiment, the relatively low temperature hot water drawn out of the hot water storage tank 2 from the second hot water supply connection port 18 and the hot water in the water supply pipe 21 can be mixed at a desired ratio. As shown in FIG. 5, the relatively low temperature hot water drawn out of the hot water storage tank 2 from the second hot water connection port 18 may be sent to the low temperature hot water supply faucet 114A as it is.

5, 112 is a hot water mixing valve, 113A is a low temperature hot water thermistor, 113B is a high temperature hot water thermistor, 123 is a first hot water piping, 124 is a second hot water piping, 126 is a second drawer piping, and 127 is A bypass pipe 114B is a hot water supply faucet. In FIG. 5, the same components as those shown in FIG. 1 are denoted by the same reference numerals as those in FIG.

In the hot water supply apparatus of FIG. 5, the end of the first hot water supply pipe 123 on the side of the hot water supply is connected to the low temperature hot water supply faucet 114A, and the end of the second hot water supply pipe 124 on the side of the hot water supply is connected to the hot water supply faucet 114B. However, the end of the first hot water supply pipe 123 on the side of the hot water and the end of the second hot water outlet pipe 124 on the side of the hot water may be connected to the same faucet.

In the hot water supply apparatus of FIG. 5, hot water drawn out of the hot water storage tank 2 from the second hot water supply connection port 18 is led to the low temperature hot water supply faucet 114A through the first hot water supply pipe 123, as shown in FIG. The connecting pipe 228, the hot water supply mixing valve 229, and the first hot water supply pipe 223 may lead to the low temperature hot water supply faucet 114A.

Since the hot water supply mixing valve 229 is connected to the water supply pipe 21 via the bypass pipe 227, the hot water in the connection pipe 228 and the hot water in the water supply pipe 21 can be mixed at a desired ratio.

In the hot water supply apparatus of FIG. 6, the end of the first hot water supply pipe 223 on the side of the hot water supply is connected to the low temperature hot water supply faucet 114A, and the end of the second hot water supply pipe 124 on the side of the hot water supply is connected to the hot water supply faucet 114B. However, the end of the first hot water piping 223 on the hot water side and the end of the second hot water piping 124 on the hot water side may be connected to the same faucet.

In FIG. 6, the same components as those shown in FIGS. 1 and 5 are denoted by the same reference numerals as those in FIGS. 1 and 5 and the description thereof is omitted.

5 and 6, the hot water supply heat exchanger 103 in FIG. 4 may be used instead of the hot water supply heat exchanger 3.

In the first embodiment, a hot water supply thermistor may be attached to the first lead pipe 22 so that the temperature of the hot water in the first lead pipe 22 can be detected by the hot water thermistor.

When a hot water supply thermistor is attached to the first lead-out pipe 22, the control unit 10 controls the open / close state of the three ports of the hot water supply three-way valve 11 based on the temperature detected by the hot water supply thermistor. May be.

[Second Embodiment]
FIG. 7 is a schematic diagram showing the configuration of the heating and hot water supply apparatus according to the first embodiment of the present invention. In FIG. 7, the same components as those shown in FIG. 1 are denoted by the same reference numerals as those of the components in FIG.

The heating and hot water supply apparatus includes a heat pump unit 1, a hot water storage tank 2, and a heating circulation circuit 351. Although not shown, the hot water storage heat exchanger 3 shown in FIG. 1 or the hot water supply heat exchanger 103 shown in FIG. 4 is arranged in the hot water storage tank 2. Further, the heater 6 shown in FIG. 1 is disposed at a substantially central portion in the vertical direction in the hot water storage tank 2. Further, the first tank thermistor 7, the second tank thermistor 8, and the third tank thermistor 9 shown in FIG. The heating circulation circuit 351 is an example of a circulation circuit.

The heating circulation circuit 351 passes the hot water stored in the hot water storage tank 2 through the plurality of heating terminals 352A, 352B,... Outside the hot water storage tank 2, and then returns the hot water to the hot water storage tank 2 for circulation. belongs to. The heating circulation circuit 351 is connected to the heating forward connection port 352, the heating return connection port 353, and the heating return port 16.

The heating / outlet connection port 352 is for taking out hot water in the hot water storage tank 2. The heating / outgoing connection port 352 is provided at a substantially central portion in the vertical direction of the hot water storage tank 2 and is located near and above the heater 6 (not shown). Thus, the hot water immediately after being heated by the heater 6 can be taken out from the heating forward connection port 352 and sent to the plurality of heating terminals 352A, 352B,.

The heating return port 16 can be used to take out hot water in the hot water storage tank 2 in the same manner as the heating forward connection port 352. Since the boiling return port 16 is provided in the upper part of the hot water storage tank 2, a relatively high temperature hot water in the upper part of the hot water storage tank 2 is taken out from the boiling return port 16 to obtain a plurality of heating terminals 352A, 352B. , ... can be sent.

Each of the heating terminals 352A, 352B,... Directly takes out the heat of the hot water flowing from the hot water storage tank 2 and releases it into the room. And the said warm water becomes low temperature, leaves each heating terminal 352A, 352B, ..., and flows toward the heating return connection port 353.

The heating return connection port 353 is provided in the lower part of the hot water storage tank 2. Thereby, the hot water flowing toward the heating return connection port 353 can be mixed with the hot water in the lower part of the hot water storage tank 2.

The heating circulation circuit 351 is provided with a bypass pipe 354, a heating mixing valve 355, a first temperature sensor 356A, a second temperature sensor 356B, a heating circulation pump 357, and a heating three-way valve 358.

The bypass pipe 354 guides part of the hot water flowing from the heating terminals 352A, 352B,... To the heating return connection port 353 to the heating mixing valve 355.

The heating mixing valve 355 has an inlet through which hot water from the hot water storage tank 2 flows and an inlet through which hot water from the bypass pipe 354 flows. Although described in detail later, the opening degree of each inlet of the heating mixing valve 355 is adjusted by the control unit 310.

The first temperature sensor 356A detects the temperature of hot water from the hot water storage tank 2 toward the heating terminals 352A, 352B,..., And sends a signal indicating the temperature to the control unit 310.

The second temperature sensor 356B detects the temperature of hot water from the heating terminals 352A, 352B,... Toward the hot water storage tank 2, and sends a signal indicating the temperature to the control unit 310.

The control unit 310 receives a signal indicating an outside air temperature from an outside temperature sensor (not shown) and also receives a signal indicating an indoor temperature from an indoor temperature sensor (not shown). The control unit 310 can perform hot water supply control similar to that of the control unit 10 of the first embodiment, but the hot water control has been described in the first embodiment and is omitted.

The heating circulation pump 357 sucks the hot water in the hot water storage tank 2 through the heating connection port 352 or the heating return port 16 and discharges it toward the plurality of heating terminals 352A, 352B,.

The heating three-way valve 358 takes out hot water from the heating forward connection port 352 when the high temperature region of the hot water in the hot water storage tank 2 exists in the vicinity of the heating forward connection port 352. The heating three-way valve 358 takes hot water from the heating return port 16 when the high temperature region of the hot water in the hot water storage tank 2 does not exist in the vicinity of the heating forward connection port 352. Switching of the heating three-way valve 358 is performed by the control unit 310. That is, the control unit 310 switches the heating three-way valve 358 based on the temperature of the hot water in each part in the hot water storage tank 2.

When the heating / hot water supply apparatus having the above configuration starts the heating operation, the heating circulation pump 357 is operated. Thereby, the hot water stored in the hot water storage tank 2 is sent to the plurality of heating terminals 352A, 352B,... At this time, the heat of the hot water is released into the room through the heating terminals 352A, 352B,. That is, each said heating terminal 352A, 352B, ... takes out the heat of the warm water in the hot water storage tank 2 directly, and discharges it indoors.

Therefore, since the heat of the hot water in the hot water storage tank 2 can be efficiently supplied to the heating terminals 352A, 352B,..., Sufficient heating can be performed even in areas with a high heating load such as Northern Europe.

Moreover, since the hot water supply heat exchanger 3 of FIG. 1 or the hot water supply heat exchanger 103 of FIG. 4 is disposed in the hot water storage tank 2, it is the same as the hot water supply apparatus of the first embodiment or its modification. The effect of this can also be obtained.

In the second embodiment, the hot water in the hot water storage tank 2 is sent to the heating terminals 352A, 352B,..., And although not shown, the water discharged from the heat exchanger in the hot water storage tank 2 is sent to the faucet. However, the hot water in the hot water storage tank 2 may be sent to the faucet, and the water discharged from the heat exchanger in the hot water storage tank 2 may be sent to the heating terminals 352A, 352B,.

That is, the hot water system of the present invention is configured such that water flowing from the bottom to the top inside the heat exchanger disposed in the hot water storage tank is discharged from, for example, a kitchen, washroom or bathroom faucet. Alternatively, water flowing from the bottom to the top inside the heat exchanger disposed in the hot water storage tank may be used at the heating terminal.

[Third Embodiment]
FIG. 8 is a schematic diagram showing a configuration of a bath water heater of a third embodiment of the present invention. In FIG. 8, the same components as those shown in FIG. 1 are denoted by the same reference numerals as those of the components in FIG.

The bath water heater includes a bathtub 400 that is supplied with water whose temperature has risen through the heat exchanger 3. The water in the bathtub 400 is drawn out of the bathtub 400, flows into the heat exchanger 3 for hot water supply, and can be returned to the bathtub 400 again.

The bathtub 400 is connected to the water supply pipe 21 via the connection pipe 401. An on-off valve 402 is provided in the water supply pipe 21 upstream of the connection point between the connection pipe 401 and the water supply pipe 21. The city water is supplied or not supplied into the hot water supply heat exchanger 3 through the water supply pipe 21 by opening and closing the on-off valve 402.

The connection pipe 401 is provided with a recirculation circulation pump 403, a recirculation thermistor 404, and a recirculation three-way valve 405. The reheating three-way valve 405 is connected to the hot water supply mixing valve 12 via a bypass pipe 406.

The bath hot water supply apparatus includes a hot water supply thermistors 411 and 407 attached to the first and second lead pipes 22 and 26 and a guide pipe that guides the hot water heated by the heat pump unit 1 to the heating return port 16. 408 and a fourth tank thermistor 409 attached to the hot water storage tank 2.

The hot water thermistors 411 and 407 detect the temperature of hot water in the first and second lead pipes 22 and 26 and output a signal indicating the temperature to the control unit 410. The control unit 410 is an example of a control device.

The fourth tank thermistor 409 is attached to the outer wall of the hot water storage tank 2 and detects the temperature of the hot water below the heater 6. The first tank thermistor 7, the second tank thermistor 8, and the third tank thermistor 9 are also attached to the outer wall of the hot water storage tank 2, and hot water corresponding to the height of the place where each is installed. Detect temperature. For example, the first tank thermistor 7 detects the temperature of hot water near the bottom of the hot water storage tank 2. Signals indicating these temperatures are sent to the control unit 410.

The control unit 410 controls the opening degree of each inlet of the hot water supply mixing valve 12 based on signals from the hot water supply thermistors 13, 407, and 411, and supplies hot water in the first hot water supply pipe 23 and the water supply pipe 21. May or may not be mixed with city water. Further, the control unit 410 controls the open / closed state of the three ports of the hot water supply three-way valve 11 based on the signal from the second tank thermistor 8, and thus the inside of the intermediate portion in the vertical direction of the hot water supply heat exchanger 3. The hot water is drawn out of the hot water storage tank 2 without passing through the upper part of the hot water supply heat exchanger 3, or the hot water in the upper part of the hot water heat exchanger 3 is drawn out of the hot water tank 2. Or The control unit 410 also controls starting and stopping of the boiling circulation pump 4 and the recirculation circulation pump 403, opening / closing of the on-off valve 402, and the like.

According to the bath water heater configured as described above, when hot water is filled in the bathtub 400, the control unit 410 first opens the on-off valve 402 as shown in FIG. At the same time, the control unit 410 controls the open / close state of the three ports of the reheating three-way valve 405 so that the connection pipe 401 and the bypass pipe 406 communicate with each other. That is, the port on the hot water mixing valve 12 side and the water supply piping 21 side of the reheating three-way valve 405 is fully opened, and the port on the bathtub 400 side of the reheating three-way valve 405 is fully closed. Thereby, the city water in the water supply pipe 21 is divided into two on the downstream side of the on-off valve 402, one flowing toward the first hot water supply connection port 17, and the other flowing toward the watering three-way valve 405.

And the said control part 410 determines whether the temperature which the thermistor 411 for hot water supply detected is more than predetermined temperature. At this time, if it is determined that the temperature is equal to or higher than the predetermined temperature, the ports on the first outlet piping 22 side and the first outlet piping 23 side of the hot water supply three-way valve 11 are fully opened and the hot water supply three-way valve 11 is returned. Fully close the port on the pipe 25 side. As a result, the hot water in the middle portion of the hot water supply heat exchanger 3 in the vertical direction is drawn out of the hot water storage tank 2 without flowing in the upper part of the hot water heat exchanger 3 in the vertical direction. On the other hand, when it is determined that the temperature is lower than the predetermined temperature, the first outlet pipe 22 side and the return pipe 25 side of the hot water supply three-way valve 11 are fully opened, and the first hot water supply three-way valve 11 is closed. Fully close the port on the side of the outlet pipe 23. As a result, the hot water in the upper part of the hot water supply heat exchanger 3 in the vertical direction is drawn out of the hot water storage tank 2.

In addition, the control unit 410 adjusts the ratio of mixing the city water in the water supply pipe 21 with the hot water in the first hot water supply pipe 23 by the hot water supply mixing valve 12 based on signals from the thermistors 13, 407, and 411 for hot water supply. Then, the temperature of the hot water in the second hot water supply pipe 24 is set to the user's desired temperature.

And the said control part 410 determines whether the amount of water in the bathtub 400 reached the user's desired amount of water based on the signal from the flow sensor which is not shown in figure attached to the 2nd hot water piping 24. At this time, if it is determined that the amount of water in the bathtub 400 has not reached the user's desired amount of water, the opening / closing valve 402 is kept open. On the other hand, when it is determined that the amount of water in the bathtub 400 has reached the user's desired amount of water, the on-off valve 402 is closed, and hot water filling is completed.

In the case where the bath water heater performs reheating, the control unit 410 closes the on-off valve 402 as shown in FIG.

The controller 410 fully opens the two ports on the connection piping 401 side of the reheating three-way valve 405, fully opens the ports on the water supply piping 21 side and the bathtub 400 side of the reheating three-way valve 405, The port on the hot water supply mixing valve 12 side of the firing three-way valve 405 is fully closed. Thereby, the water in the bathtub 400 can be made to flow to the first hot water supply connection port 17 via the connection pipe 401.

Then, the control unit 410 drives the reheating pump 403. Thereby, the water in the bathtub 400 returns to the bathtub 400 after being heated in the hot water supply heat exchanger 3. At this time, the inlet on the first hot water supply pipe 23 side of the hot water supply mixing valve 12 is fully opened, while the inlet on the bypass pipe 406 side of the hot water supply mixing valve 12 is fully closed.

And the said control part 410 determines whether the temperature which the thermistor 411 for hot water supply detected is more than predetermined temperature. At this time, if it is determined that the temperature is equal to or higher than the predetermined temperature, the ports on the first draw-out piping 22 side and the first outlet piping 23 side of the hot water supply three-way valve 11 are fully opened and the hot water supply three-way valve 11 is opened. The port on the return pipe 25 side is fully closed. Thereby, the hot water in the middle part of the hot water supply heat exchanger 3 in the vertical direction is drawn out of the hot water storage tank 2 without flowing in the upper part of the hot water heat exchanger 3 in the vertical direction. On the other hand, when it is determined that the temperature is lower than the predetermined temperature, the first outlet pipe 22 side and the return pipe 25 side of the hot water supply three-way valve 11 are fully opened, and the first hot water supply three-way valve 11 is closed. Fully close the port on the side of the outlet pipe 23. As a result, the hot water in the upper part of the hot water supply heat exchanger 3 in the vertical direction is drawn out of the hot water storage tank 2.

And the said control part 410 determines whether the temperature of the water in the bathtub 400 became a user's desired temperature. At this time, if it is determined that the temperature is not equal to the user's desired temperature, the chasing is continued, whereas if it is determined that the temperature is not equal to the user's desired temperature, the chasing is ended. In addition, what is necessary is just to perform the determination whether the temperature of the water in the said bathtub 400 became a user's desired temperature using the thermistor attached to the bathtub 400 or the connection piping 401, for example.

In this way, the water in the bathtub 400 is drawn out of the bathtub 400 and flows into the hot water supply heat exchanger 3 so that it can be returned to the bathtub 400 again. You can cook.

In the third embodiment, the control unit 410 controls the open / closed states of the three ports of the hot water supply three-way valve 11 based on the temperature detected by the hot water supply thermistor 411, but as in the first embodiment. Based on the signal from the second tank thermistor 8, the open / closed state of the three ports of the hot water supply three-way valve 11 may be controlled.

The description of the first to third embodiments may be combined as appropriate to form an embodiment of the hot water system of the present invention. For example, the third embodiment may be modified as in the modification of the first embodiment.

DESCRIPTION OF SYMBOLS 1 Heat pump unit 2 Hot water storage tank 3,103 Heat exchanger for hot water supply 6 Heater 8 Temperature sensor for 2nd tank 10,410 Control part 11 Three-way valve for hot water supply 18 Second hot water supply connection port 20 Fourth hot water supply connection port 351 Heating circulation circuit 352A, 352B, ... Heating terminal 400 Bathtub

Claims (13)

Heat pump unit (1),
A hot water storage tank (2) for storing hot water heated by the heat pump unit (1);
A heat exchanger (3, 103) disposed in the hot water storage tank (2), in which water flows from bottom to top in the interior;
An intermediate hot water discharge section (18) connected to the vertical intermediate section of the heat exchanger (3, 103) for drawing water in the intermediate section out of the hot water storage tank (2) is provided. And a hot water system. The hot water system according to claim 1,
An upper hot water discharge section (20) for discharging the water in the upper part of the heat exchanger (3, 103) out of the hot water storage tank (2);
A hot water system comprising a switching section (11) for switching the hot water between the upper hot water section (20) and the intermediate hot water section (18). The hot water system according to claim 2,
The hot water system, wherein the switching unit (11) is a three-way valve (11) leading to the upper hot water supply unit (20) and the intermediate hot water supply unit (18). The hot water system according to claim 3,
The hot water system, wherein the three-way valve (11) is disposed outside the hot water storage tank (2). In the warm water system as described in any one of Claim 2 to 4,
A temperature sensor (8) for detecting the temperature of the hot water in the intermediate portion in the hot water storage tank (2);
A control device (10, 310, 410) for controlling the switching unit (11) based on the temperature detected by the temperature sensor (8);
The control device (10, 310, 410)
A temperature determination unit (S2) for determining whether or not the temperature detected by the temperature sensor (8) is equal to or higher than a target temperature;
When the temperature determination unit (S2) determines that the temperature detected by the temperature sensor (8) is equal to or higher than the target temperature, the switching is performed so that the intermediate hot water discharge unit (18) performs the hot water discharge. A hot water system comprising a switching control section (S3, S11) for controlling the section (11). In the hot water system according to any one of claims 1 to 4,
Hot water in the lower part of the hot water storage tank (2) is sent to the heat pump unit (1), and the hot water heated by the heat pump unit (1) is returned into the upper part of the hot water storage tank (2). system. In the hot water system according to any one of claims 1 to 4,
In the heat exchanger (3, 103), the length of the portion below the location connected to the intermediate hot water outlet (18) is longer than the location connected to the intermediate hot water outlet (18). It is formed so that it may become longer than the length of the upper part, The hot water system characterized by the above-mentioned. In the hot water system according to any one of claims 1 to 4,
The lower part of the said heat exchanger (3,103) is arrange | positioned over the whole up-down direction in the lower part of the said hot water storage tank (2), The hot water system characterized by the above-mentioned. In the hot water system according to any one of claims 1 to 4,
The hot water stored in the hot water storage tank (2) passes through the heating terminals (352A, 352B) outside the hot water storage tank (2), and then returns to the hot water storage tank (2) for circulation. A hot water system comprising a circulation circuit (351). In the hot water system according to any one of claims 1 to 4,
The hot water system, wherein the refrigerant used in the heat pump unit (1) is a CO ₂ refrigerant. In the hot water system according to any one of claims 1 to 4,
The hot water system in which the water flowing from the bottom to the top in the heat exchanger (3, 103) is hot water. In the hot water system according to any one of claims 1 to 4,
A hot water system comprising a heater (6) disposed at a substantially central portion in the vertical direction in the hot water storage tank (2). In the hot water system according to any one of claims 1 to 4,
A bath (400) that is supplied with water that has been heated through the heat exchanger (3, 103);
The water in the bathtub (400) is drawn out of the bathtub (400), flows into the heat exchanger (3, 103), and can be returned to the bathtub (400) again. A featured hot water system.

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