JP6775191B2 - Hot water heater - Google Patents

Description

The present invention relates to a hot water storage type hot water supply device that stores hot water heated by a heating means in a hot water storage tank and uses it.

This type of hot water supply device heats the water supplied from the bottom of the hot water storage tank to a high temperature by a heating means and repeats a series of cycles of storing the water in the upper part of the hot water storage tank covered with a heat insulating material, thereby performing the entire hot water storage tank. Or store hot water in a part. When the user uses hot water to supply hot water, the temperature is adjusted to a predetermined temperature by mixing with unheated water and used at the hot water supply terminal.
The operating efficiency of the heat pump type heating means used here depends on the outside air temperature, the boiling temperature, and the entry temperature, which is the temperature of the water supplied to the heating means, and when the outside air temperature is high or the boiling temperature is low, Alternatively, the operating efficiency is improved when the water entry temperature is low. The outside air temperature fluctuates depending on the season and operating time, and in addition, the incoming water temperature also fluctuates depending on the temperature state of the hot water storage tank.
In particular, when using a terminal that uses heat in the hot water storage tank such as bath reheating or radiator, it is higher than the water supply temperature after heat exchange between the hot water in the heat utilization terminal and the hot water in the hot water storage tank with a heat exchanger. The structure is such that the intermediate temperature (medium hot water), which is high but cannot be used for hot water supply as it is, is returned to the bottom of the hot water storage tank. Originally, low-temperature water equivalent to the water supply temperature exists at the bottom of the hot water storage tank, but when the heat utilization terminal is used, the medium-temperature water at the bottom of the hot water storage tank heats up when boiling. Since it is supplied to the means, the water entry temperature rises and the efficiency drops significantly.
Patent Document 1 describes a first hot water supply pipe connected to the upper part of a hot water storage tank, a water supply pipe connected to the lower part of the hot water storage tank, a position where the first hot water supply pipe is connected, and a position where the water supply pipe is connected. The second hot water outlet pipe connected between the two, the heat utilization hot water outlet pipe connected to the upper part of the hot water storage tank, the heat exchanger connected to the heat utilization hot water outlet pipe, and the heat exchanger and the hot water storage tank connected to each other. We are proposing a hot water supply device that includes a heat utilization return pipe and connects the heat utilization return pipe to the hot water storage tank at a position higher than the connection position of the hot water storage tank of the second hot water discharge pipe.

Japanese Unexamined Patent Publication No. 2012-266990

According to Patent Document 1, when hot water is used in the heat utilization terminal, the medium hot water generated by the hot water returning from the heat exchanger to the hot water storage tank can be effectively used through the second hot water outlet pipe.

The present invention provides a hot water supply device capable of increasing the amount of medium-temperature water taken out, which is not suitable for hot water supply, and suppressing the amount of medium-temperature water boiling, which reduces efficiency at the time of boiling, by taking out medium-temperature water at different temperatures. With the goal.

The hot water supply device of the present invention according to claim 1 is connected to a hot water storage tank, a first hot water pipe that is connected to the upper part of the hot water storage tank and discharges hot water, and is connected to the lower part of the hot water storage tank to supply city water. A water supply pipe that supplies water into the hot water storage tank and a heat utilization hot water pipe that is connected to the upper part of the hot water storage tank and supplies the hot water in the hot water storage tank to a heat exchanger arranged outside the hot water storage tank. A heat utilization return pipe for returning the hot water from the heat exchanger to the hot water storage tank, and a medium temperature hot water discharge section for discharging the hot water such as medium hot water from the hot water storage tank are provided. It has a plurality of openings for taking out the hot water of the medium-temperature water from different heights in the hot water storage tank, a switching portion for changing the opening area of each of the plurality of openings, and a take-out portion, and all the openings. The portion is arranged between the hot water storage tank connection position of the first hot water pipe and the hot water storage tank connection position of the water supply pipe, and the hot water storage tank connection position of the heat utilization return pipe is set to the opening at the highest position. The inflow amount of hot water from one of the openings is reduced by reducing the opening area of one of the openings by one switching portion, which is the height between the portion and the opening at the lowest position. The inflow of the hot water from the other opening is increased by decreasing and increasing the opening area of the other opening, from the hot water from one opening and from the other opening. It is characterized in that the hot water is mixed and guided to the take-out portion .
The hot water supply device of the present invention according to claim 2 is connected to a hot water storage tank, a first hot water pipe that is connected to the upper part of the hot water storage tank and discharges hot water, and is connected to the lower part of the hot water storage tank to supply city water. A water supply pipe that supplies water into the hot water storage tank, a heat exchanger that is arranged in the hot water storage tank and exchanges heat with the hot water in the hot water storage tank, and hot water such as medium-temperature water from the hot water storage tank. Equipped with a medium-temperature hot water supply section for hot water
The medium-temperature hot water outlet portion includes a plurality of openings for taking out the medium-temperature hot water from different heights in the hot water storage tank, a switching portion for changing the opening area of each of the plurality of openings, and a take-out portion . All of the openings are arranged between the hot water storage tank connection position of the first hot water pipe and the hot water storage tank connection position of the water supply pipe, and the installation position of the highest portion of the heat exchanger is set. , The height between the opening at the highest position and the opening at the lowest position, and the switching portion reduces the opening area of one of the openings from one of the openings. By reducing the inflow of hot water and increasing the opening area of the other opening, the inflow of hot water from the other opening is increased, and the hot water from one opening and the other It is characterized in that the hot water from the opening is mixed and guided to the take-out portion .
According to the third aspect of the present invention, in the hot water supply device according to the first aspect, the hot water storage tank connection position of the heat utilization return pipe is the opening at the position next to the opening at the highest position. It is characterized by having a height equal to or higher than that of.
According to the fourth aspect of the present invention, in the hot water supply device according to the second aspect, the installation position of the highest portion of the heat exchanger is set to the opening located at the position next to the opening at the highest position. It is characterized by having a height equal to or higher than that of.

According to the hot water supply device of the present invention, medium-temperature water that flows into and diffuses into the hot water storage tank from the heat utilization return pipe can be taken out from openings having different heights and used for hot water supply, so that the efficiency is reduced during boiling. It is possible to provide a hot water supply device with excellent energy saving by suppressing the amount of hot water boiling.

A block diagram showing a hot water supply device according to a first embodiment of the present invention. Temperature distribution map with temperature on the horizontal axis and hot water tank height on the vertical axis Explanatory drawing which shows the structure and operation of the medium temperature hot water outlet by Example 1. A block diagram showing a hot water supply device according to a second embodiment of the present invention. Explanatory drawing which shows the structure and operation of the medium temperature hot water outlet part by Example 2. A block diagram showing a hot water supply device according to a third embodiment of the present invention. Explanatory drawing which shows composition and operation of the medium temperature hot water outlet part by Example 3. A block diagram showing a hot water supply device according to a fourth embodiment of the present invention. A block diagram showing a hot water supply device according to a fifth embodiment of the present invention.

The hot water supply device according to the first embodiment of the present invention is connected to a hot water storage tank, a first hot water pipe that is connected to the upper part of the hot water storage tank and discharges hot water, and is connected to the lower part of the hot water storage tank to supply city water. A water supply pipe that supplies water to the inside of the hot water storage tank, a heat-utilizing hot water outlet pipe that is connected to the upper part of the hot water storage tank and supplies hot water from the hot water storage tank to a heat exchanger arranged outside the hot water storage tank, and a heat exchanger. It is equipped with a heat utilization return pipe that returns hot water from the hot water tank to the hot water storage tank, and a medium temperature hot water outlet that discharges hot water such as medium hot water from the hot water storage tank. The medium temperature hot water supply unit is provided with hot water from different heights in the hot water tank. It has a plurality of openings for taking out the heat, a switching part for changing the opening area of each of the plurality of openings, and a take-out part, and all the openings are connected to the hot water storage tank connection position of the first hot water pipe and the water supply pipe. The hot water storage tank connection position of the heat utilization return pipe is set to the height between the opening at the highest position and the opening at the lowest position, and one switching unit is provided. By reducing the opening area of one opening, the inflow of hot water from one opening is reduced, and by increasing the opening area of the other opening, the inflow of hot water from the other opening is reduced. Is increased, and the hot water from one opening and the hot water from the other opening are mixed and guided to the take-out part . According to the present embodiment, the medium-warm water that flows into the hot water tank from the heat utilization return pipe and diffuses can be taken out from openings having different heights and used for hot water supply, so that the efficiency is reduced at the time of boiling. It is possible to provide a hot water supply device with excellent energy saving by suppressing the amount of boiling water.

The hot water supply device according to the second embodiment of the present invention is connected to a hot water storage tank, a first hot water pipe that is connected to the upper part of the hot water storage tank and discharges hot water, and is connected to the lower part of the hot water storage tank to supply city water. a hot water storage tank water supply pipe for supplying to, is disposed in the hot water storage tank, a heat exchanger for hot water water heat exchanger in the hot water tank, medium temperature to tapping hot water water such as medium-temperature water from the hot water storage tank hot water comprising a part, a medium-temperature outlet hot water unit, a switching unit for changing a plurality of openings for taking out the medium-temperature water of the hot water water from different heights in the hot water tank, the respective opening areas of the plurality of openings, the take-out portion has the door, all the openings, disposed between the hot water tank connected position of the first tapping pipe hot water tank connected position of the water supply pipe, the installation position of the highest part of the heat exchanger, most The height between the opening at the highest position and the opening at the lowest position is set, and the inflow of hot water from one opening is reduced by reducing the opening area of one opening by the switching portion. By increasing the opening area of the other opening, the inflow of hot water from the other opening is increased, and the hot water from one opening and the hot water from the other opening are mixed and guided to the extraction section. It is a thing. According to the present embodiment, the high-temperature hot water in the hot water storage tank exchanges heat with the heat exchanger arranged in the hot water storage tank, and the medium-warm water whose temperature drops and diffuses is taken out from openings having different heights. Since it can be used for hot water supply, it is possible to provide a hot water supply device with excellent energy saving by suppressing the amount of boiling of medium-temperature water whose efficiency decreases during boiling.

In the third embodiment of the present invention, in the hot water supply device according to the first embodiment, the hot water storage tank connection position of the heat utilization return pipe is set to the opening at the position next to the opening at the highest position. It is more than the height. Since the medium-warm water flowing into the hot water tank from the heat-utilizing return pipe has a higher specific gravity than the high-temperature water, it diffuses more downward than the hot-water storage tank connection position of the heat-utilizing return pipe. According to this embodiment, more medium-temperature water can be taken out by providing more openings below the hot water storage tank connection position of the heat utilization return pipe.

In the fourth embodiment of the present invention, in the hot water supply device according to the second embodiment, the installation position of the highest portion of the heat exchanger is set to the opening at the position next to the opening at the highest position. It is more than the height of. The hot water in the hot water storage tank exchanges heat with the heat exchanger arranged in the hot water storage tank, and the medium hot water whose temperature has dropped has a higher specific gravity than the high temperature water, so the highest part of the heat exchanger is installed. It spreads more below the position. According to this embodiment, more medium-temperature water can be taken out by providing more openings below the installation position of the highest portion of the heat exchanger.

Hereinafter, the hot water supply device according to the embodiment of the present invention will be described.
FIG. 1 is a configuration diagram showing a hot water supply device according to the first embodiment.
The hot water supply device according to the present embodiment includes a hot water storage tank 1, a heating means 2 for heating the water in the hot water storage tank 1, a hot water supply port 3 for flowing out hot water (high temperature water) in the hot water storage tank 1, and a hot water storage tank 1. It is provided with a heat exchanger 4 which is arranged outside and uses the high temperature water in the hot water storage tank 1 as a heating source. The heat utilization terminal 5 utilizes the heat medium heated by the heat exchanger 4.
A water supply pipe 11 is connected to the lower part of the hot water storage tank 1. The hot water storage tank 1 always maintains a constant amount of hot water supplied from the water supply pipe 11. The connection end 11a of the water supply pipe 11 is a hot water storage tank connection position of the water supply pipe 11.

For the heating means 2, for example, a heat pump device can be used. The hot water storage tank 1 and the heating means 2 are connected by a water discharge pipe 21 and a return pipe 22. One end of the water discharge pipe 21 is connected to the lower part of the hot water storage tank 1, and the other end is connected to the heating means 2. One end of the return pipe 22 is connected to the heating means 2, and the other end is connected to the upper part of the hot water storage tank 1. The low-temperature hot water (low-temperature water) existing in the lower part of the hot water storage tank 1 is guided to the heating means 2 by the water discharge pipe 21. The high-temperature water heated by the heating means 2 is returned to the upper part of the hot water storage tank 1 by the return pipe 22, and is stored in the temperature stratified state.
The hot water supply port 3 is connected to the hot water storage tank 1 by the first hot water outlet pipe 31. The first hot water outlet pipe 31 has one end 31a connected to the upper part of the hot water storage tank 1 and the other end connected to the hot water supply port 3. The high-temperature water existing in the upper part of the hot water storage tank 1 is guided to the hot water supply port 3 by the first hot water outlet pipe 31. One end 31a of the first hot water pipe 31 serves as a hot water storage tank connection position of the first hot water pipe 31.

The first hot water pipe 31 is provided with a first mixing valve 6 and a second mixing valve 7. The first mixing valve 6 is provided on the upstream side of the second mixing valve 7, that is, on the hot water storage tank 1.
A second hot water pipe 32 is connected to the first mixing valve 6. One end of the second hot water discharge pipe 32 is connected to the intermediate portion in the vertical direction of the hot water storage tank 1, and the other end is connected to the first mixing valve 6. The medium-temperature hot water (medium-temperature water) existing in the vertical intermediate portion of the hot water storage tank 1 is guided to the first mixing valve 6 by the second hot water outlet pipe 32.
A water supply branch pipe 12 is connected to the second mixing valve 7. One end of the water supply branch pipe 12 is connected to the water supply pipe 11, and the other end is connected to the second mixing valve 7. The low temperature water supplied from the water supply branch pipe 12 is guided to the second mixing valve 7.
High-temperature water flows into the first mixing valve 6 from the first hot water pipe 31, and medium-temperature water flows into the first hot water pipe 32. The inflowing hot water and medium hot water are mixed by the first mixing valve 6 and then guided to the second mixing valve 7.
Hot water from the first mixing valve 6 and low-temperature water from the water supply branch pipe 12 flow into the second mixing valve 7. The hot water and the low temperature water from the first mixing valve 6 are guided to the hot water supply port 3 after being mixed by the second mixing valve 7.

The hot water storage tank 1 and the heat exchanger 4 are connected by a heat utilization hot water discharge pipe 41 and a heat utilization return pipe 42. One end of the heat utilization hot water discharge pipe 41 is connected to the upper part of the hot water storage tank 1, and the other end is connected to the heat exchanger 4. One end of the heat utilization return pipe 42 is connected to the heat exchanger 4, and the other end 42a is connected to the intermediate portion in the vertical direction of the hot water storage tank 1. The other end 42a of the heat utilization return pipe 42 is a hot water storage tank connection position of the heat utilization return pipe 42. A circulation pump 43 is provided in the heat utilization return pipe 42. The hot water existing in the upper part of the hot water storage tank 1 is guided to the heat exchanger 4 by the heat utilization hot water discharge pipe 41. The medium-temperature water radiated by the heat exchanger 4 is returned to the intermediate portion in the vertical direction of the hot water storage tank 1 by the heat utilization return pipe 42.

The heat exchanger 4 and the heat utilization terminal 5 are connected by a heat medium supply pipe 51 and a heat medium return pipe 52. One end of the heat medium supply pipe 51 is connected to the heat exchanger 4, and the other end is connected to the heat utilization terminal 5. One end of the heat medium return pipe 52 is connected to the heat utilization terminal 5, and the other end is connected to the heat exchanger 4. A circulation pump 53 is provided in the heat medium return pipe 52. The heat medium of the heat utilization terminal 5 is guided to the heat exchanger 4 by the heat medium return tube 52. The heat medium heated by the heat exchanger 4 is supplied to the heat utilization terminal 5 by the heat medium supply pipe 51.

A medium temperature hot water outlet unit 60 is arranged in the hot water storage tank 1.
The medium temperature hot water outlet portion 60 has a plurality of openings 61a, 61b, 61c and a take-out portion 62.
The plurality of openings 61a, 61b, 61c are arranged in the hot water storage tank 1 in the substantially vertical direction. The take-out section 62 is connected to the second hot water discharge pipe 32.
All the openings 61a, 61b, 61c are arranged between the hot water storage tank connection position 31a of the first hot water pipe 31 and the hot water storage tank connection position 11a of the water supply pipe 11. By arranging the plurality of openings 61a, 61b, 61c in the vertical intermediate portion of the hot water storage tank 1, medium-temperature water having different temperatures can be taken out.
According to this embodiment, since the medium-temperature hot water outlet unit 60 can mix hot water of different temperatures in the hot water storage tank 1 to take out the medium-temperature water, it is possible to increase the amount of medium-temperature water that is not suitable for hot water supply. .. Therefore, the amount of high-temperature water taken out from the upper part of the hot water storage tank 1 can be reduced, and a hot water supply device having high energy saving can be provided.
Further, according to the present embodiment, by arranging the plurality of openings 61a, 61b, 61c in the hot water storage tank 1 in the substantially vertical direction, the hot water in the hot water storage tank 1 is drained in the vertical direction. Since the hot water flows out from the opening 61c at the lowest position, no hot water remains in the medium temperature hot water outlet portion 60. Therefore, it is possible to prevent freezing breakage caused by the residual hot water in the medium temperature hot water outlet portion 60.

Hot water that has flowed in from at least two of the plurality of openings 61a, 61b, and 61c at different temperatures is mixed and flows out from the take-out portion 62 to the second hot water pipe 32.

The hot water storage tank connection position 42a of the heat utilization return pipe 42 is set to the height between the opening 61a at the highest position and the opening 61c at the lowest position. In this way, the position of the hot water returning from the heat utilization return pipe 42 to the hot water storage tank 1 is set to the height between the opening 61a at the highest position and the opening 61c at the lowest position, thereby utilizing heat. Since the medium-temperature water that flows into the hot water storage tank 1 from the return pipe 42 and diffuses can be taken out from the openings 61a, 61b, 61c having different heights and used for hot water supply, particularly when a heat pump device is used as the heating means 2. It is possible to provide a hot water supply device having excellent energy saving by suppressing the amount of boiling of medium-temperature water whose efficiency decreases at the time of boiling.

The hot water storage tank connection position 42a of the heat utilization return pipe 42 is preferably set to be equal to or higher than the height of the opening 61b located at the next highest position after the opening 61a at the highest position. Since the medium-warm water flowing into the hot water storage tank 1 from the heat utilization return pipe 42 has a higher specific gravity than the high-temperature water, it diffuses more downward than the hot water storage tank connection position of the heat utilization return pipe 42. More openings 61b and 61c are provided below the hot water storage tank connection position 42a of the heat utilization return pipe 42 than the openings 61a arranged above the hot water storage tank connection position of the heat utilization return pipe 42. Medium hot water can be taken out.

All the openings 61a, 61b, 61c are arranged below the height of the take-out portion 62. By arranging all the openings 61a, 61b, 61c below the height of the take-out portion 62, when the take-out of the medium-temperature water is stopped, the take-out portion 62 is exposed to the hot water at the positions of the openings 61a, 61b, 61c. Since it is filled with hot water at a high temperature, the hot water at a high temperature can be discharged at the initial stage of taking out the medium hot water. Therefore, hot water of a predetermined temperature can be supplied at an early stage.

FIG. 2 shows a temperature distribution diagram in which the horizontal axis is the temperature and the vertical axis is the height of the hot water storage tank. FIG. 2 (a) is the case of this embodiment, and FIG. 2 (b) is medium hot water from only the opening 61b. Is taken out, and the opening / closing of the opening 61b is switched according to a predetermined temperature (for example, the opening 61b is fully opened when the temperature is between 35 ° C. and 40 ° C.).
T1 is the water supply temperature, T2 is the upper limit temperature of the medium temperature water, Wma and Wmb are the layers of the medium temperature water from the supply temperature T1 to the upper limit temperature of the medium temperature water T2, the solid line is the temperature distribution before the hot water is discharged from the medium temperature hot water outlet 60, and the broken line is the medium temperature. It is a temperature distribution when hot water is discharged from the hot water discharge unit 60.
As shown in FIG. 2B, in the simple switching of opening and closing depending on the temperature, the hot water existing in the vicinity of the opening 61b is taken out only when the temperature is a predetermined temperature. When hot water is discharged, the hot water in the hot water storage tank 1 moves upward as a whole, so that it is taken out only when hot water of a predetermined temperature, for example, 35 to 40 ° C. is approaching the vicinity of the opening 61b, and after the hot water is discharged. The region of medium temperature water is Wmb.
On the other hand, as shown in FIG. 2A, in the case of this embodiment, since the hot water in the vicinity of the opening 61b and the hot water in the opening 61c are mixed, there is no limit to the temperature at which the water can be taken out. This is because even if the hot water in the hot water storage tank 1 moves to the upper part, the hot water is sucked up from each opening by the shape memory unit described later, and the hot water is mixed at a predetermined temperature.
As a result, it can be seen that the region of the medium-temperature water after the hot water is discharged becomes Wma, which has less medium-temperature water than Wmb, the medium-temperature water can be effectively used, and the amount of boiling of the medium-temperature water whose efficiency decreases at the time of boiling can be suppressed.

FIG. 3 is an explanatory diagram showing the configuration and operation of the medium temperature hot water outlet according to the first embodiment.
The configuration of the medium temperature hot water outlet unit 60 will be described with reference to FIG. 3A.
The medium temperature hot water outlet portion 60 includes a plurality of openings 61a, 61b, 61c, 61d, a take-out portion 62, and switching portions 63a, 63b for changing the opening areas of the plurality of openings 61a, 61b, 61c, 61d, respectively. It has shape storage units 64a and 64b that move the switching units 63a and 63b based on the temperature of the surrounding hot water. The opening 61d draws hot water flowing from the opening 61b or the opening 61c, or hot water flowing from the opening 61b and the opening 61c, and guides the hot water to the outlet 62.

The plurality of openings 61a, 61b, 61c, 61d are formed in the tubular medium-temperature hot water outlet main body 65. The opening 61c communicates with the lower end opening 65a of the medium temperature hot water outlet main body 65. The opening 61b is formed above the opening 61c. The opening 61d is formed above the opening 61b. The opening 61a is formed above the opening 61d.

Mixing portions 66a and 66b are formed in the medium temperature hot water outlet main body 65.
The mixing portion 66a is formed above the opening 61a. The mixing portion 66b is formed above the opening 61b and below the opening 61d.

The switching portion 63a changes the opening area between the opening 61a and the opening 61d by moving in the height direction.
A shape storage unit 64a is arranged above (downstream side) the switching unit 63a. The shape storage unit 64a moves the switching unit 63a upward when the ambient hot water temperature becomes lower than the predetermined temperature. As shown in the figure, it is preferable to move the switching unit 63a together with the shape memory unit 64a by using the urging spring 67a. By using the urging spring 67a together with the shape storage unit 64a, the operating temperatures at the time of raising the temperature and the time of lowering the temperature can be matched.

The switching portion 63b changes the opening area between the opening 61b and the opening 61c by moving in the height direction.
A shape storage unit 64b is arranged above (downstream side) the switching unit 63b. The shape memory unit 64b moves the switching unit 63b upward when the ambient hot water temperature becomes lower than the predetermined temperature. As shown in the figure, it is preferable to move the switching unit 63b by using the urging spring 67b together with the shape memory unit 64b. By using the urging spring 67b together with the shape memory unit 64b, it is possible to match the operating temperatures at the time of raising the temperature and the time of lowering the temperature.

The operation of the medium temperature hot water outlet main body 65 when the hot water temperature in the take-out unit 62 is set to 40 ° C. will be described below. In this embodiment, the shape memory units 64a and 64b are set to operate in the shrinking direction when the ambient hot water temperature falls below 40 ° C.

FIG. 3A shows a state in which the hot water temperature at the lower end opening 65a of the medium temperature hot water outlet main body 65 is 45 ° C.
Since the hot water temperature at the lower end opening 65a is higher than 40 ° C., the shape memory unit 64b is in an extended state, and the switching unit 63b is moving downward. When the switching portion 63b is moved downward, the opening 61c is open and the opening 61b is closed.
Further, since the shape memory unit 64a is located higher than the lower end opening 65a and the temperature of the hot water around the shape memory unit 64a is also higher than 40 ° C., it is in an extended state, and the switching unit 63a is moving downward. When the switching portion 63a is moved downward, the opening 61d is open and the opening 61a is closed.
In the state of FIG. 3A, the hot water in the lower end opening 65a flows in from the opening 61c, passes through the mixing portion 66b, the opening 61d, and the mixing portion 66a in this order, and is guided to the take-out portion 62.

FIG. 3B shows a state in which the hot water temperature at the lower end opening 65a of the medium temperature hot water outlet main body 65 is lowered to 20 ° C.
When the hot water temperature at the lower end opening 65a of the medium-temperature hot water outlet main body 65 decreases, the hot water temperature around the shape memory unit 64b drops, so that the shape memory unit 64b contracts and the switching unit 63b moves upward.
As the switching portion 63b moves upward, the opening area of the opening 61c decreases, and the opening 61b starts opening. As the opening area of the opening 61c decreases, the inflow amount of water at 20 ° C. decreases, and as the opening area of the opening 61b increases, the inflow amount of hot water at 60 ° C. increases. The opening of the opening 61b raises the temperature of the hot water around the shape memory unit 64b, and the switching unit 63b moves so that the temperature of the hot water around the shape memory unit 64b becomes 40 ° C.
In the state of FIG. 3B, hot water flows in from the opening 61c and the opening 61b, passes through the mixing portion 66b, the opening 61d, and the mixing portion 66a in this order, and is guided to the extraction portion 62.

FIG. 3C shows a state in which the hot water temperature at the opening 61b has dropped to 40 ° C.
When the hot water temperature at the opening 61b drops to 40 ° C., the hot water temperature around the shape memory unit 64b falls below 40 ° C. due to the inflow of hot water from the opening 61a, so that the shape memory unit 64b shrinks and the switching unit 63b Moves upwards.
When the switching portion 63b moves upward, the opening 61c is closed and only the opening 61b is opened.
In the state of FIG. 3C, hot water flows into the opening 61d only through the opening 61b, passes through the mixing portion 66b, the opening 61d, and the mixing portion 66a in this order, and is guided to the extraction portion 62.

FIG. 3D shows a state in which the temperature of the hot water at the opening 61b is lower than 40 ° C., for example, 20 ° C.
When the hot water temperature at the opening 61b drops to 20 ° C., the hot water temperature around the shape memory unit 64a falls below 40 ° C., so that the shape memory unit 64a shrinks and the switching unit 63a moves upward.
As the switching portion 63a moves upward, the opening area of the opening 61d decreases, and the opening 61a starts opening. As the opening area of the opening 61d decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61a increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61a raises the temperature of the hot water around the shape memory unit 64a, and the switching unit 63a moves so that the temperature of the hot water around the shape memory unit 64a becomes 40 ° C.
In the state of FIG. 3D, hot water flows in from the opening 61b and the opening 61a, passes through the mixing portion 66a, and is guided to the take-out portion 62.

FIG. 3 (e) shows a state in which the hot water temperature at the opening 61a is lowered to 40 ° C.
When the hot water temperature at the opening 61a drops to 40 ° C., the hot water temperature around the shape memory unit 64a falls below 40 ° C. due to the inflow of hot water from the opening 61b, so that the shape memory unit 64a shrinks and the switching unit 63a Moves upwards.
When the switching portion 63a moves upward, the opening 61d is closed and only the opening 61a is opened.
In the state of FIG. 3 (e), hot water flows in only through the opening 61a and is guided to the take-out portion 62 through the mixing portion 66a.

In this embodiment, the operating temperature of the shape memory unit 64a and the shape memory unit 64b has been described as the same 40 ° C., but the operating temperature of the shape memory unit 64b may be set lower than that of the shape memory unit 64a. .. When the extraction unit 62 is located higher than the shape memory unit 64b, when the temperature of the hot water from the opening 61b and the opening 61c is 40 ° C., the mixture is warmed by heat conduction from the surrounding hot water. Since it is mixed with the hot water in the part 66a and the hot water temperature exceeds 40 ° C. in the take-out part 62, the operating temperature of the shape memory unit 64b is set to a temperature lower than 40 ° C. Large temperature fluctuations can be suppressed. Further, the operating temperature of the shape storage unit 64b can be set lower than that of the shape storage unit 64a, the switching unit 63b can roughly adjust the temperature, and the switching unit 63a can perform strict temperature adjustment.

FIG. 4 is a configuration diagram showing a hot water supply device according to a second embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
In this embodiment, all the openings 61a, 61b, 61c in the medium temperature hot water outlet 60 are arranged above the height of the take-out portion 62. By arranging all the openings 61a, 61b, 61c above the height of the take-out part 62, the low temperature radiated by the second hot water pipe 32, which is a pipe outside the hot water storage tank 1, when the take-out of medium-temperature water is stopped. Water flows into the take-out portion 62, but since the take-out portion 62 is located at a position lower than the openings 61a, 61b, and 61c, it is possible to prevent the hot water having a high temperature in the hot water storage tank 1 from being cooled. Therefore, it is possible to prevent the hot water in the hot water storage tank 1 from being reduced.

FIG. 5 is an explanatory diagram showing the configuration and operation of the medium temperature hot water outlet according to the second embodiment. A part of the description common to the first embodiment will be omitted.

The configuration of the medium temperature hot water outlet unit 60 will be described with reference to FIG. 5A.
In this embodiment, the opening 61a communicates with the upper end opening 65b of the medium temperature hot water outlet main body 65.
Mixing portions 66c and 66d are formed in the medium temperature hot water outlet main body 65.
The mixing portion 66c is formed below the opening 61b and above the opening 61d. The mixing portion 66d is formed below the opening 61c.

The switching portion 63a changes the opening area between the opening 61a and the opening 61b by moving in the height direction.
A shape storage unit 64a is arranged below (downstream side) the switching unit 63a. The shape memory unit 64a moves the switching unit 63a downward when the ambient hot water temperature becomes lower than the predetermined temperature.

The switching portion 63b changes the opening area between the opening 61d and the opening 61c by moving in the height direction.
A shape storage unit 64b is arranged below (downstream side) the switching unit 63b. The shape memory unit 64b moves the switching unit 63b downward when the ambient hot water temperature becomes lower than the predetermined temperature.

The operation of the medium temperature hot water outlet main body 65 when the hot water temperature in the take-out unit 62 is set to 40 ° C. will be described below. The shape memory units 64a and 64b are set to operate in the contracting direction when the ambient hot water temperature falls below 40 ° C.

FIG. 5A shows a state in which the hot water temperature at the lower end opening 65a of the medium temperature hot water outlet main body 65 is 45 ° C.
Since the hot water temperature at the opening 61c is higher than 40 ° C., the shape memory unit 64b is in an extended state, and the switching unit 63b is moving upward. When the switching portion 63b is moved upward, the opening 61c is open and the opening 61d is closed.
Further, the shape memory unit 64a is located higher than the opening 61c, and the temperature of the hot water around the shape memory unit 64a is also higher than 40 ° C., so that the shape storage unit 64a is in an extended state, and the switching unit 63a is moving upward. When the switching portion 63a is moved upward, the opening 61b is open and the opening 61a is closed.
In the state of FIG. 5A, hot water flows in through the opening 61c and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 5B shows a state in which the hot water temperature at the opening 61c of the medium temperature hot water outlet main body 65 is lowered to 20 ° C.
When the hot water temperature at the opening 61c of the medium temperature hot water outlet main body 65 decreases, the hot water temperature around the shape memory unit 64b drops, so that the shape memory unit 64b shrinks and the switching unit 63b moves downward.
As the switching portion 63b moves downward, the opening area of the opening 61c decreases, and the opening 61d starts opening. Since the opening 61b is open, hot water at 60 ° C. flows into the opening 61d from the opening 61b. As the opening area of the opening 61c decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61d increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61d raises the temperature of the hot water around the shape memory unit 64b, and the switching unit 63b moves so that the temperature of the hot water around the shape memory unit 64b becomes 40 ° C.
In the state of FIG. 5B, hot water flows in from the opening 61c and the opening 61d, and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 5C shows a state in which the hot water temperature at the opening 61b has dropped to 40 ° C.
When the hot water temperature at the opening 61b drops to 40 ° C., the hot water temperature around the shape memory unit 64b falls below 40 ° C. due to the inflow of hot water from the opening 61b, so that the shape memory unit 64b shrinks and the switching unit 63b Moves down.
When the switching portion 63b moves downward, the opening 61c is closed and only the opening 61d is opened.
In the state of FIG. 5C, hot water flows into the opening 61d only through the opening 61b and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 5D shows a state in which the temperature of the hot water at the opening 61b is lower than 40 ° C, for example, 20 ° C.
When the hot water temperature at the opening 61b drops to 20 ° C., it is mixed with the hot water in the mixing unit 66d cooled by heat conduction from the surrounding low temperature hot water, and the hot water temperature around the shape memory unit 64a falls below 40 ° C. Therefore, the shape storage unit 64a contracts, and the switching unit 63a moves downward.
As the switching portion 63a moves downward, the opening area of the opening 61b decreases, and the opening 61a starts opening. As the opening area of the opening 61b decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61a increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61a raises the temperature of the hot water around the shape memory unit 64a, and the switching unit 63a moves so that the temperature of the hot water around the shape memory unit 64a becomes 40 ° C.
In the state of FIG. 5D, hot water flows in from the opening 61b and the opening 61a, passes through the mixing portion 66c, the opening 61d, and the mixing portion 66d in this order, and is guided to the taking-out portion 62.

FIG. 5 (e) shows a state in which the hot water temperature at the opening 61a is lowered to 40 ° C.
When the hot water temperature at the opening 61a drops to 40 ° C., the hot water temperature around the shape memory unit 64a falls below 40 ° C. due to the inflow of hot water from the opening 61b, so that the shape memory unit 64a shrinks and the switching unit 63a Moves down.
When the switching portion 63a moves downward, the opening 61b is closed and only the opening 61a is opened.
In the state of FIG. 5 (e), hot water flows in only through the opening 61a and is guided to the take-out portion 62 through the mixing portion 66c, the opening 61d, and the mixing portion 66d in this order.

In this embodiment, the operating temperature of the shape memory unit 64a and the shape memory unit 64b has been described as the same 40 ° C., but the operating temperature of the shape memory unit 64b may be set higher than that of the shape memory unit 64a. .. When the take-out part 62 is located at a position lower than the shape memory part 64b, when the temperature of the hot water from the opening 61b and the opening 61c is 40 ° C., the take-out part 62 heats the surrounding low-temperature hot water. Since the hot water temperature is lower than 40 ° C. due to conduction, the set temperature at the take-out unit 62 can be maintained by setting the operating temperature of the shape memory unit 64b to a temperature higher than 40 ° C.

FIG. 6 is a configuration diagram showing a hot water supply device according to the third embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
In this embodiment, the opening 61a is arranged above the height of the take-out portion 62, the opening 61b is arranged at the same height as the take-out portion 62, and the opening 61c is arranged below the height of the take-out portion 62. By arranging the openings 61a, 61b, 61c at different heights above the height of the take-out portion 62 and below the height of the take-out portion 62, hot water having a predetermined temperature at the time of taking out the medium-temperature water is provided. It is possible to maintain the early supply and the temperature distribution in the hot water storage tank 1, and to prevent the decrease of the high temperature water in the hot water storage tank 1 when the take-out of the medium hot water is stopped.

FIG. 7 is an explanatory diagram showing the configuration and operation of the medium temperature hot water outlet according to the third embodiment. A part of the description common to the first or second embodiment will be omitted.
The configuration of the medium temperature hot water outlet unit 60 will be described with reference to FIG. 7A.
The switching portion 63b changes the opening area between the opening 61d and the opening 61c by moving in the horizontal direction.
A shape storage unit 64b is arranged on the downstream side of the switching unit 63b. The shape memory unit 64b moves the switching unit 63b to the downstream side when the ambient hot water temperature becomes lower than the predetermined temperature.

The operation of the medium temperature hot water outlet main body 65 when the hot water temperature in the take-out unit 62 is set to 40 ° C. will be described below. The shape memory units 64a and 64b are set to operate in the contracting direction when the ambient hot water temperature falls below 40 ° C.

FIG. 7A shows a state in which the hot water temperature at the lower end opening 65a of the medium temperature hot water outlet main body 65 is 45 ° C.
Since the hot water temperature at the opening 61c is higher than 40 ° C., the shape memory unit 64b is in an extended state, and the switching unit 63b is moving to the upstream side. When the switching portion 63b is moved to the upstream side, the opening 61c is open and the opening 61d is closed.
Further, the shape memory unit 64a is located higher than the opening 61c, and the temperature of the hot water around the shape memory unit 64a is also higher than 40 ° C., so that the shape storage unit 64a is in an extended state, and the switching unit 63a is moving upward. When the switching portion 63a is moved upward, the opening 61b is open and the opening 61a is closed.
In the state of FIG. 7A, hot water flows in through the opening 61c and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 7B shows a state in which the hot water temperature at the opening 61c of the medium temperature hot water outlet main body 65 is lowered to 20 ° C.
When the hot water temperature at the opening 61c of the medium temperature hot water outlet main body 65 decreases, the hot water temperature around the shape memory unit 64b drops, so that the shape memory unit 64b shrinks and the switching unit 63b moves to the downstream side.
As the switching portion 63b moves to the downstream side, the opening area of the opening 61c decreases, and the opening 61d starts opening. Since the opening 61b is open, hot water at 60 ° C. flows into the opening 61d from the opening 61b. As the opening area of the opening 61c decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61d increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61d raises the temperature of the hot water around the shape memory unit 64b, and the switching unit 63b moves so that the temperature of the hot water around the shape memory unit 64b becomes 40 ° C.
In the state of FIG. 7B, hot water flows in from the opening 61c and the opening 61d, and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 7C shows a state in which the hot water temperature at the opening 61b has dropped to 40 ° C.
When the hot water temperature at the opening 61b drops to 40 ° C., the hot water temperature around the shape memory unit 64b falls below 40 ° C. due to the inflow of hot water from the opening 61c, so that the shape memory unit 64b shrinks and the switching unit 63b Moves to the downstream side.
When the switching portion 63b moves to the downstream side, the opening 61c is closed and only the opening 61d is opened.
In the state of FIG. 7C, hot water flows into the opening 61d only through the opening 61b and is guided to the take-out portion 62 through the mixing portion 66d.

FIG. 7D shows a state in which the temperature of the hot water at the opening 61b is lower than 40 ° C, for example, 20 ° C.
When the hot water temperature at the opening 61b drops to 20 ° C., the hot water temperature around the shape memory unit 64a falls below 40 ° C., so that the shape memory unit 64a shrinks and the switching unit 63a moves downward.
As the switching portion 63a moves downward, the opening area of the opening 61b decreases, and the opening 61a starts opening. As the opening area of the opening 61b decreases, the inflow of water at 20 ° C. decreases, and as the opening area of the opening 61a increases, the inflow of hot water at 60 ° C. increases. The opening of the opening 61a raises the temperature of the hot water around the shape memory unit 64a, and the switching unit 63a moves so that the temperature of the hot water around the shape memory unit 64a becomes 40 ° C.
In the state of FIG. 7D, hot water flows in from the opening 61b and the opening 61a, passes through the mixing portion 66c, the opening 61d, and the mixing portion 66d in this order, and is guided to the taking-out portion 62.

FIG. 7 (e) shows a state in which the hot water temperature at the opening 61a is lowered to 40 ° C.
When the hot water temperature at the opening 61a drops to 40 ° C., the hot water temperature around the shape memory unit 64a falls below 40 ° C. due to the inflow of hot water from the opening 61b, so that the shape memory unit 64a shrinks and the switching unit 63a Moves down.
When the switching portion 63a moves downward, the opening 61b is closed and only the opening 61a is opened.
In the state of FIG. 7 (e), hot water flows in only through the opening 61a and is guided to the take-out portion 62 through the mixing portion 66c, the opening 61d, and the mixing portion 66d in this order.

FIG. 8 is a configuration diagram showing a hot water supply device according to a fourth embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The medium temperature hot water outlet portion 60X in this embodiment has a plurality of openings 61a, 61b, 61c, switching portions 63Xa, 63Xb, and a take-out portion 62X.
The plurality of openings 61a, 61b, 61c constituting the medium temperature hot water outlet portion 60X are connected to the hot water storage tank 1.

Also in this embodiment, the plurality of openings 61a, 61b, 61c are arranged in the substantially vertical direction. The take-out portion 62X is connected to the second hot water discharge pipe 32. The hot water that has flowed in from at least two of the openings 61a, 61b, and 61c at different temperatures is mixed and flows out from the outlet 62X to the second hot water pipe 32.
In this embodiment, hot water from the opening 61b and hot water from the opening 61c flow into the switching portion 63Xb, flow out from the mixing portion 66Xb, and are guided to the switching portion 63Xa. Further, hot water from the opening 61a and hot water from the mixing portion 66Xb flow into the switching portion 63Xa and flow out to the take-out portion 62X. Hot water from the mixing unit 66Xb flows into the opening 61Xd in the switching unit 63Xa.

The switching unit 63Xb changes the ratio of the inflow amount of hot water from the opening 61b and the inflow amount of hot water from the opening 61c. That is, it has a function of substantially changing the opening area between the opening 61b and the opening 61c.
The switching unit 63Xa changes the ratio of the inflow amount of hot water from the opening 61a and the inflow amount of hot water from the mixing unit 66Xb. That is, it has a function of substantially changing the opening area between the opening 61a and the opening 61Xd.

Further, also in this embodiment, the hot water storage tank connection position of the heat utilization return pipe 42 is set to the height between the opening 61a at the highest position and the opening 61c at the lowest position. In this way, by setting the position of the hot water returning from the heat utilization return pipe 42 to the inside of the hot water storage tank 1 to the height between the opening 61a at the highest position and the opening 61c at the lowest position, it is relatively possible. The hot water near the opening 61a where the high temperature is maintained is mixed with the opening 61b or the opening 61c where the medium temperature water flows into the hot water storage tank 1 from the heat utilization return pipe 42 and the temperature becomes relatively low. Since it can be used for hot water supply, particularly when a heat pump device is used as the heating means 2, it is possible to suppress the amount of boiling of medium-temperature water whose efficiency decreases at the time of boiling, and to provide a hot water supply device excellent in energy saving.

Further, also in this embodiment, the hot water storage tank connection position of the heat utilization return pipe 42 is preferably set to be equal to or higher than the height of the opening 61b located at the next highest position after the opening 61a at the highest position. Since the medium-warm water flowing into the hot water storage tank 1 from the heat utilization return pipe 42 has a higher specific gravity than the high-temperature water, it diffuses more downward than the hot water storage tank connection position of the heat utilization return pipe 42. By providing more openings 61b and 61c arranged below the hot water storage tank connection position of the heat utilization return pipe 42 than the opening 61a arranged above the hot water storage tank connection position of the heat utilization return pipe 42, more Medium hot water can be taken out.

FIG. 9 is a configuration diagram showing a hot water supply device according to a fifth embodiment. The same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.
The heat exchanger 4 in this embodiment is arranged in the hot water storage tank 1, and uses the high temperature water in the hot water storage tank 1 as a heating source. The heat exchanger 4 and the heat utilization terminal 5 are connected by a heat medium supply pipe 51 and a heat medium return pipe 52. One end of the heat medium supply pipe 51 is connected to the heat exchanger 4, and the other end is connected to the heat utilization terminal 5. One end of the heat medium return pipe 52 is connected to the heat utilization terminal 5, and the other end is connected to the heat exchanger 4. A circulation pump 53 is provided in the heat medium return pipe 52. The heat medium of the heat utilization terminal 5 is guided to the heat exchanger 4 by the heat medium return tube 52. The heat medium heated by the heat exchanger 4 is supplied to the heat utilization terminal 5 by the heat medium supply pipe 51.

Further, in the present embodiment, the heat exchanger 4 is installed in the vertical direction at a height between the opening 61a at the highest position and the opening 61c at the lowest position, so that the temperature is relatively high. The hot water in the vicinity of the opening 61a where the above is maintained is mixed with the opening 61b or the opening 61c in which medium-temperature water is generated in the hot water storage tank 1 by heat exchange with the heat exchanger 4 and the temperature becomes relatively low. Since it can be used for hot water supply, particularly when a heat pump device is used as the heating means 2, it is possible to suppress the amount of boiling of medium-temperature water whose efficiency decreases at the time of boiling, and to provide a hot water supply device excellent in energy saving.

Further, in this embodiment, it is preferable that the installation position of the highest portion of the heat exchanger 4 in the vertical direction is equal to or higher than the height of the opening 61b located at the next highest position after the opening 61a at the highest position. .. Since the medium-temperature water generated by heat exchange with the heat exchanger 4 has a higher specific gravity than the high-temperature water, it diffuses more downward than the installation position of the highest portion in the vertical direction of the heat exchanger 4. By providing more openings 61b and 61c arranged below the hot water storage tank connection position of the heat utilization return pipe 42 than the openings 61a arranged above the installation position of the highest portion in the vertical direction of the heat exchanger 4. , More medium hot water can be taken out.
In this embodiment, the configuration in which the medium-temperature hot water discharge unit 60 is arranged in the hot water storage tank 1 has been described, but the medium-temperature hot water discharge unit 60X like the hot water supply device shown in FIG. 8 according to the fourth embodiment is used. Even in a configuration in which a plurality of the constituent openings 61a, 61b, 61c are connected to the hot water storage tank 1, the same actions and effects as in the fifth embodiment can be obtained.

When the heat of the hot water in the hot water storage tank is used by the heat utilization terminal, the hot water supply device according to the present invention reduces the decrease in efficiency due to the use by the heat utilization terminal. It can also be applied to large-scale applications such as those for use, and can provide excellent energy saving.

1 Hot water storage tank 2 Heating means 3 Hot water supply port 4 Heat exchanger 5 Heat utilization terminal 6 1st mixing valve 7 2nd mixing valve 11 Water supply pipe 31 1st hot water pipe 32 2nd hot water pipe 60, 60X Medium temperature hot water outlet 61a, 61b, 61c, 61d, 61Xd Opening 62 Extraction 63a, 63b, 63Xa, 63Xb Switching part 64a, 64b Shape storage 65a Lower end opening 65b Upper end opening 66a, 66b, 66c, 66d Mixing part 67a, 67b Bounce spring

Claims (4)

With a hot water tank
A first hot water pipe connected to the upper part of the hot water storage tank to discharge high-temperature hot water,
A water supply pipe connected to the lower part of the hot water storage tank and supplying city water into the hot water storage tank,
A heat-utilizing hot water outlet pipe connected to the upper part of the hot water storage tank and supplying the hot water in the hot water storage tank to a heat exchanger disposed outside the hot water storage tank.
A heat utilization return pipe that returns the hot water from the heat exchanger to the hot water storage tank,
A medium-temperature hot water outlet unit that discharges the hot water such as medium-temperature water from the hot water storage tank.
With
The medium temperature hot water outlet
A plurality of openings for taking out the hot water of the medium hot water from different heights in the hot water storage tank, and
A switching unit that changes the opening area of each of the plurality of openings,
It has a take-out part and <br />
All the openings
It is arranged between the hot water storage tank connection position of the first hot water pipe and the hot water storage tank connection position of the water supply pipe.
The hot water storage tank connection position of the heat utilization return pipe,
The height between the opening at the highest position and the opening at the lowest position .
By one of the switching parts
By reducing the opening area of one of the openings, the inflow of hot water from one of the openings is reduced, and by increasing the opening area of the other opening, the amount of hot water flowing from the other opening is increased. Increasing the inflow of hot water
A hot water supply device characterized in that the hot water from one of the openings and the hot water from the other opening are mixed and guided to the take-out portion . With a hot water tank
A first hot water pipe connected to the upper part of the hot water storage tank to discharge high-temperature hot water,
A water supply pipe connected to the lower part of the hot water storage tank and supplying city water into the hot water storage tank,
A heat exchanger disposed in the hot water storage tank and exchanging heat with the hot water in the hot water storage tank.
A medium-temperature hot water outlet unit that discharges the hot water such as medium-temperature water from the hot water storage tank.
With
The medium temperature hot water outlet
A plurality of openings for taking out the hot water of the medium hot water from different heights in the hot water storage tank, and
A switching unit that changes the opening area of each of the plurality of openings,
It has a take-out part and <br />
All the openings
It is arranged between the hot water storage tank connection position of the first hot water pipe and the hot water storage tank connection position of the water supply pipe.
The installation position of the highest part of the heat exchanger,
The height between the opening at the highest position and the opening at the lowest position .
By the switching part
By reducing the opening area of one of the openings, the inflow of hot water from one of the openings is reduced, and by increasing the opening area of the other opening, the amount of hot water flowing from the other opening is increased. Increasing the inflow of hot water
A hot water supply device characterized in that the hot water from one of the openings and the hot water from the other opening are mixed and guided to the take-out portion . The hot water storage tank connection position of the heat utilization return pipe,
The hot water supply device according to claim 1, wherein the height is equal to or higher than the height of the opening located at the highest position next to the opening at the highest position. The installation position of the highest part of the heat exchanger,
The hot water supply device according to claim 2, wherein the height is equal to or higher than the height of the opening located at the highest position next to the opening at the highest position.