WO2012098763A1

WO2012098763A1 - Heat storage device and hot water supply device equipped with heat storage device

Info

Publication number: WO2012098763A1
Application number: PCT/JP2011/076718
Authority: WO
Inventors: 泉　久雄
Original assignee: Izumi Hisao
Priority date: 2011-01-19
Filing date: 2011-11-18
Publication date: 2012-07-26
Also published as: JP4861519B1; JP2012149814A

Abstract

Provided is a compact heat storage device which has high insulating performance and can be implemented with a low cost and a low environmental load, and can be installed in a limited space; also provided is a hot water supply device equipped with the heat storage device. This heat storage device (1) is equipped with a hot water storage tank (11) the entire periphery of which is enclosed by an insulating unit, with the insulating unit comprising at least two layers of vacuum insulating spaces (21, 22), and insulating members (20) enclosed in the vacuum insulating spaces (21, 22). The heat storage device (1) also is equipped with a water supply means (30) that supplies water to the interior of the hot water storage tank (11), a heating means (32) that heats the water supplied to the hot water storage tank (11) to produce hot water (2) having a prescribed temperature, and a discharge means that discharges the hot water (2) from the hot water storage tank (11). An upper surface aperture part (14) having a float valve (19) is formed on the upper surface of the water storage tank (11) as the lone access port connecting the interior and the exterior of the water storage tank (11).

Description

Heat storage device and water heater provided with the heat storage device

The present invention relates to a heat storage device and a water heater provided with the heat storage device. More specifically, the present invention relates to a small heat storage device that has high heat insulation performance, achieves low cost and energy saving, and can be installed in a limited space, and a water heater provided with the heat storage device.

Conventionally, as a heat storage device used for a water heater or the like, water is supplied from below the hot water tank, heated by a heater fixed to the inner surface of the hot water tank, and then discharged from above the hot water tank. A mechanism is known (Patent Documents 1 and 2).

In the structure in which the heater is housed inside the hot water tank as described above, it is difficult to perform treatment such as repair or replacement when the heater breaks down. Therefore, the heat storage device having such a structure has problems from the viewpoint of cost and environmental consideration.

In addition, in the heat storage device having the above-described structure, it is necessary to provide a plurality of openings on the inner wall of the hot water tank, but in the heat storage device that requires high airtightness and heat insulation, the inner and outer sides of the hot water tank It can be said that increasing the number of liaisons that connect together is associated with risks. In particular, when the airtightness in the vicinity of the water supply port provided on the bottom surface of the hot water storage tank is lowered, there is a possibility that not only the heat insulation performance of the heat storage device is lowered but also a serious problem such as water leakage occurs.

On the other hand, a heat storage device in which two layers of vacuum heat insulating layers are stacked around a hot water storage tank is disclosed in order to remove as much as possible the connection portion with the outside on the wall surface of the hot water storage tank and to further improve the heat insulation (Patent Document). 3).

In such a structure, the concern about deterioration in airtightness and heat insulation caused by a large number of connecting parts is alleviated to some extent, but there is still a possibility of water leakage from the bottom surface of the hot water tank. Furthermore, in the heat-insulating layer that has been evacuated, it is inevitable that the heat-insulating property will deteriorate with the aging of the tank and packing part forming the heat-insulating layer, but its recovery and repair are difficult. There is a maintenance problem.

Of course, as is understood, in a normal heat storage device, the water temperature in the hot water tank is higher as it goes upward and lower as it goes downward. As described above, since the temperature distribution is generated in the hot water storage tank, a considerably large hot water storage tank is required to secure a predetermined amount of hot water at a predetermined temperature, which is not preferable from the viewpoint of cost and installation space. Further, in a normal heat storage device in which such a temperature distribution occurs, heat transfer occurs in the hot water tank, and it goes without saying that extra energy is required to heat the water to a predetermined temperature and maintain the temperature. Yes.

Japanese Patent No. 3729897 JP 2001-116367 A Japanese Patent No. 4571703

The present invention has been made in view of such problems of the prior art, and the problem is that the heat insulating effect is high, compact, and excellent in terms of not only cost but also maintenance and environmental load. Another object of the present invention is to provide a heat storage device and a water heater provided with the heat storage device.

In order to achieve the above object, according to the present invention, the following heat storage device and water heater provided with the heat storage device are provided.

[1] A heat storage device including a hot water storage tank whose entire outer periphery is surrounded by a heat insulating portion, wherein the heat insulating portion includes at least two layers of vacuum heat insulating space, and a heat insulating member is enclosed in the vacuum heat insulating space. Water supply means for supplying water into the hot water storage tank, heating means for heating the water supplied into the hot water storage tank to obtain hot water of a predetermined temperature, and drainage for discharging the hot water from the hot water storage tank And an upper surface opening having a float valve is formed on the upper surface of the hot water tank as the only opening that connects the inside and the outside of the hot water tank, the water supply means, the heating means, and the The drainage means is a heat storage device that enters and exits the hot water storage tank through the upper surface opening.

[2] By providing a second tank outside the hot water storage tank which is the first tank, a first vacuum heat insulating space is formed between the first tank and the second tank, By providing a third tank further outside the second tank, a second vacuum heat insulating space is formed between the second tank and the third tank, and the first vacuum heat insulating space and the first tank The heat storage device according to [1], wherein the heat insulation member is sealed in the vacuum insulation space of 2 so as to cover the first tank and the second tank, respectively.

[3] The heat storage device according to [1] or [2], wherein the heat insulating member is a heat insulating panel obtained by sandwiching and sealing a heat insulating material inside a two-layer reflecting material.

[4] The heat storage device according to [2] or [3], wherein the first tank, the second tank, and the third tank are made of mirror-finished metal.

[5] A slide support base having a cylindrical space on the inside above the upper surface opening, and a slide member that can move the inside of the slide support base in the vertical direction via an O-ring, At least a part of each of the water supply means, the heating means, and the drainage means is housed in the slide member, and the vertical movement of the slide member and the float valve of the upper surface opening are provided. The heat storage device according to any one of [1] to [4], wherein the water supply means, the heating means, and the drainage means can be moved in and out of the hot water storage tank by being synchronized with opening and closing of the water supply.

[6] The water supply means is a tubular member provided with a water supply port in the vicinity of the lower end thereof, and is capable of supplying the water near the bottom surface in the hot water tank. The heat storage device described in 1.

[7] The heat storage device according to any one of [1] to [6], wherein the heating unit is a movable heating unit capable of controlling the operation of the whole or a part of the hot water storage tank.

[8] The heat storage device according to any one of [1] to [7], further including stirring means capable of stirring the warm water in the hot water storage tank.

[9] The heat storage device according to [8], wherein the agitation unit is a movable agitation unit capable of controlling the operation of the whole or a part of the hot water storage tank.

[10] Temperature measuring means for measuring the temperature of the hot water in the hot water tank, water detecting means for detecting the presence of the hot water at a predetermined height position in the hot water tank, and air in the hot water tank The heat storage device according to any one of [5] to [9], wherein at least one of the air feeding means to be fed is provided in a state in which at least a part thereof is housed in the slide member.

[11] The heat storage device according to any one of [1] to [10], wherein the hot water storage tank has a substantially rectangular parallelepiped shape that is long in a vertical direction.

[12] A water heater provided with the heat storage device according to any one of [1] to [11].

[13] The water heater according to [12], further including a filtering device that allows the remaining hot water to be circulated and used by filtering the remaining hot water in the bathtub and guiding it to the heat storage device.

[14] The water heater according to [13], wherein the filtration device includes a ceramic membrane filter.

According to the heat storage device and the water heater provided with the heat storage device of the present invention, it is possible to maintain the water temperature in the hot water tank for a long time, for example, using cheap midnight power, time zones other than midnight It is possible to operate at low cost and save resources, such as supplying hot water used in As a result, not only the running cost can be reduced, but also the environmental load such as the generation of CO ₂ can be reduced.

In addition, the heat storage device of the present invention and the water heater provided with the heat storage device realize a considerable size reduction as compared with the conventional one, and it is easy even in a narrow water space in a kitchen or bathroom of a general household. It can be installed in the network, and the initial cost at the time of introduction can be kept low.

It is the typical sectional view which looked at a part of one embodiment of the heat storage device of the present invention from the side. It is the typical sectional view which looked at one embodiment of the slide member of the thermal storage device of the present invention from the upper surface direction. It is typical sectional drawing which looked at one Embodiment of the water heater provided with the thermal storage apparatus of this invention from the side surface direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and changes, modifications, and improvements can be added without departing from the scope of the invention.

FIG. 1 is a schematic cross-sectional view of a part of an embodiment of a heat storage device of the present invention as viewed from the side. As shown in FIG. 1, in the heat storage apparatus 1 of this invention, the 1st tank 11 is provided as a hot water storage tank, the 2nd tank 12 is provided in the outer side, and the 3rd tank 13 is further provided in the outer side. ing. A first vacuum heat insulation space 21 is formed between the first tank 11 and the second tank 12, and a second vacuum heat insulation space 22 is formed between the second tank 12 and the third tank 13. The heat insulating member 20 is sealed in each of the first vacuum heat insulating space 21 and the second vacuum heat insulating space 22. For convenience of drawing, the heat insulating member 20 in the second vacuum heat insulating space 22 is omitted in FIG. The heat storage device 1 of the present invention improves the heat insulation performance over the conventional heat storage device by overlapping the two layers of vacuum

heat insulation spaces

21 and 22, and even if the hot water tank 11 is damaged, It has a structure that prevents water leakage.

The material forming each of the first to

third tanks

11, 12, and 13 is not particularly limited as long as it contributes to the improvement of the heat insulation performance of the heat storage device 1 by reducing the radiant heat, but the heat insulation effect. From the viewpoint of durability, it is preferable to use a metal material with a mirror finish, and it is particularly preferable to use a stainless steel material. In FIG. 1, three

tanks

11, 12, and 13 are stacked to form two layers of vacuum

heat insulating spaces

21 and 22, but in order to further improve the heat insulating performance of the heat storage device 1. In order to further increase the vacuum heat insulation space, it is possible to stack more tanks.

The heat insulating member 20 sealed in the first vacuum heat insulating space 21 and the second vacuum heat insulating space 22 is not particularly limited as long as it can be sealed in a narrow gap between the tanks, and urethane. The heat insulating material 20a which is a nonwoven fabric made of a material such as foam, glass wool, or silica fiber can be suitably used. Moreover, when these reflectors 20a are used together with a reflector 20b made of, for example, an aluminum sheet, a higher thermal insulation effect can be obtained. For example, when the heat insulating member 20 is a heat insulating panel obtained by sandwiching and sealing the above heat insulating material 20a inside the reflective material 20b of two sheets, or a vacuum heat insulating panel obtained by evacuating at the time of sealing. It is preferable because the heat insulating effect is higher than when a single heat insulating material 20a having the same thickness is used, and at the same time, it becomes easy to enclose the heat insulating member 20 so as to cover each tank even in a narrow gap.

In a conventional heat storage device that does not enclose a heat insulation member in a vacuum heat insulation space, the heat insulation space that has been evacuated is subject to deterioration in airtightness and heat insulation due to aging of the tank and packing part, and it is difficult to repair it. It is. As in the heat storage device 1 of the present invention, when the heat insulating member 20 is enclosed in the vacuum

heat insulating spaces

21 and 22, even if the airtightness of the vacuum

heat insulating spaces

21 and 22 is broken, the heat insulating member 20 The convection phenomenon and the radiation phenomenon in the vacuum

heat insulating spaces

21 and 22 can be suitably prevented.

The first to

third tanks

11, 12, and 13 are members independent of each other, but their upper surfaces are connected to each other by a plurality of plate-like members 15 and through bolts 16 as shown in FIG. The plurality of plate-like members 15 also serve to seal the vacuum

heat insulating spaces

21 and 22. As the plate-like member 15, for example, a stainless plate, a resin plate, or the like can be used in combination. Further, it is preferable to sandwich a thin heat insulating material or packing between each plate-like member 15 and the plate-like member 15 as necessary. Each of the vacuum

heat insulating spaces

21 and 22 is sealed as described above after the heat insulating member 20 is sealed, and then is evacuated through an air vent pipe (not shown) provided in some plate-like members 15. These air vent pipes are finally vacuum-sealed by caulking.

Further, an upper surface opening 14 is formed at the center of the upper surface of the first to

third tanks

11, 12, 13. In the heat storage device 1 of the present invention, the upper surface opening 14 is the only connection port that connects the inside and the outside of the hot water tank 11, and has a structure in which the airtightness of the hot water tank 11 can be maintained by the cantilevered float valve 19. It has become. The heat storage device 1 of the present invention has such a structure to prevent heat dissipation from the inside of the hot water tank 11 to the outside, and more than a conventional heat storage device provided with a plurality of openings on the inner wall of the hot water tank. It can have excellent heat insulation performance.

In the heat storage device 1 of the present invention, as shown in FIG. 1, a slide support base 9 having a cylindrical space inside and an inner side of the slide support base 9 above the upper surface opening 14 via an O-ring 10. A slide member 8 operable in the vertical direction is provided. When the slide member 8 is lowered, the float valve 19 is opened into the hot water storage tank 11, that is, downward, and when the slide member 8 is raised, the float valve 19 is returned to the original position, and the upper surface opening portion is opened. 14 is closed.

The heat storage device 1 of the present invention includes at least a water supply means 30 for supplying water into the hot water storage tank 11, a heating means 32 for heating the water supplied into the hot water storage tank 11 to make hot water 2 at a predetermined temperature, and a hot water storage tank 11 and a drainage means 31 for discharging the hot water 2 from the inside. It is preferable that at least a part of each of the water supply means 30, the heating means 32, and the drainage means 31 is accommodated in the slide member 8. That is, the vertical movement of the slide member 8 and the opening / closing of the float valve 10 at the upper surface opening 14 are synchronized, so that the water supply means 30, the heating means 32, and the drainage means 31 enter and exit the hot water storage tank 11. It is possible. By adopting such a structure, each means 30, 31, and 32 can be completely taken out of the hot water tank 11 except when necessary. Such a structure contributes to the improvement of the heat insulation performance of the heat storage device 1.

The water supply means 30 is preferably a tubular member provided with a water supply port in the vicinity of the lower end thereof. With this structure, the water supply means 30 can supply water near the bottom surface in the hot water tank 11. As a means for discharging the hot water 2 from the hot water storage tank 11, there is a method of extruding and discharging the hot water with the water pressure at the time of water supply. At that time, if the structure is as described above, the hot water 2 and water are mixed. It is suitably prevented that the temperature of the hot water is lowered. In addition, in order to heat the supplied water efficiently, it is preferable that the heater part of the heating means 32 is configured to be located in the vicinity of the water supply port. In addition, as another drainage method, the method of discharging | emitting warm water 2 with an air pressure by sending air instead of water in the hot water tank 11, etc., etc. are mentioned, for example.

As the heating means 32, a known pipe heater can be used. Moreover, it is preferable that the heating means 32 is a movable heating means capable of controlling the whole or a part of the operation in the hot water tank 11. Since the heating means 32 slides into the hot water storage tank 11 through the upper surface opening 14 of the hot water storage tank 11 when used, the effect of stirring the hot water 2 in the hot water storage tank 11 only by its vertical movement. However, by controlling the operation in the lateral direction and the oblique direction in the hot water storage tank 11, the hot water 2 in the hot water storage tank 11 can be heated and stirred at the same time. Such a stirring action is effective for keeping the water temperature in the hot water tank 11 constant. By maintaining the water temperature in the hot water storage tank 11 constant, useless convection and heat transfer in the hot water storage tank 11 can be prevented, and as a result, the heat insulation performance of the heat storage device 1 is improved. Moreover, since all the hot water storage tanks 11 are filled with the hot water of predetermined temperature, even if the size of the hot water storage tank 11 is small, a required amount of hot water can be ensured and it contributes to size reduction of the heat storage apparatus 1 whole.

Moreover, the heat storage device 1 of the present invention may further include a stirring means 33 capable of stirring the hot water 2 in the hot water tank 11. If the stirring means 33 is a shape suitable for the stirring of the hot water 2 in the hot water storage tank 11, it can be set as desired shapes, such as an umbrella shape, a propeller shape, and a lattice shape. As the material, for example, silicon is preferably used because it has little influence on the water temperature and is easy to process, but is not particularly limited. The heating means 32 and the stirring means 33 may form an integral heating and stirring means by attaching the stirring means 33 above the heating means 32 as shown in FIG.

In order to obtain a further stirring effect, the stirring means 33 is preferably a movable stirring means capable of controlling the operation of the whole or a part of the hot water tank 11 as with the heating means 32. Here, making the heating means 32 and / or the stirring means 33 movable not only increases the stirring effect for keeping the inside of the hot water tank 11 at a uniform water temperature, but also reduces the opening area of the upper surface opening 14. There is a merit that it is possible to cope with it. In order to improve the heat insulation performance of the heat storage device 1, it is needless to say that the area of the upper surface opening 14, that is, the connecting portion that connects the inner side and the outer side of the hot water tank 11, should be small. Therefore, after the heating means 32 and / or the stirring means 33 are passed through the narrow upper surface opening 14 in a compactly folded state such as a rod shape or a flat plate shape, for example, the heating means 32 and / or the stirring means 33 are three-dimensionally expanded in the hot water storage tank 11. When it is designed to be able to return to the closed state again when the tank 11 is pulled out, the heat storage device 1 having further high heat insulation performance can be obtained. Further, as a method for obtaining the same effect, it is possible to design the heating means 32 and / or the stirring means 33 itself to rotate in the hot water storage tank 11 about the vertical direction. In such a case, the shape of the upper surface opening 14 can be a desired shape such as a small circle, a small ellipse, or a slit.

FIG. 2 is a schematic cross-sectional view of one embodiment of the slide member of the heat storage device of the present invention as seen from the top surface direction. As shown in FIG. 2, the heat storage device 1 of the present invention may include various means such as pipes and sensors as needed in addition to the water supply means 30, the heating means 32, and the drainage means 31. preferable. Specifically, the temperature measuring means 34 for measuring the temperature of the hot water 2 in the hot water tank 11, the water detecting means 35 for detecting the presence of the hot water 2 at a predetermined height position in the hot water tank 11, and the hot water tank 11. It is preferable to include at least one of air input means 36 for sending air into the inside. Information obtained from the temperature measuring means 34 and the water detecting means 35 is used for feedback in order to maintain a predetermined amount of hot water 2 at a predetermined temperature in the hot water storage tank 11. The air input means 36 is used when discharging the hot water 2 from the hot water tank 11. Specifically, when air is sent into the hot water tank 11 by the air input means 36, the hot water 2 can be discharged from the hot water tank 11 by the air pressure.

Here, as shown in FIG. 2, the temperature measuring means 34, the water detecting means 35, and the air input means 36 are at least partially composed of the slide member 8 as in the water supply means 30, the heating means 32, and the drainage means 31. It is preferably provided in a state of being housed inside.

FIG. 3 is a schematic cross-sectional view of an embodiment of a water heater provided with the heat storage device of the present invention as viewed from the side. As shown in FIG.1 and FIG.3, it is preferable that the thermal storage apparatus 1 of this invention is a substantially rectangular parallelepiped shape long in a vertical direction. Many conventional heat storage devices have pipes connected to the upper and lower sides of a large cylindrical hot water storage tank, which requires a large installation space and requires extensive construction for installation. As in the heat storage device 1 of the present invention, if the heat storage device 1 is an open-open type heat storage device 1 having a slim, substantially rectangular parallelepiped shape, complicated work is required even in a narrow water space such as a kitchen or bathroom in a general household. Installation is possible without any problem.

As shown in FIG. 3, the hot water heater 51 of the present invention includes a heat storage device 1 and a filtration device 41 that allows the remaining hot water 42 to be circulated and used by filtering the remaining hot water 42 in the bathtub and guiding it to the heat storage device 1. It is preferable to provide. The filtering device 41 is not particularly limited as long as it can filter the remaining hot water 42 after bathing to a reusable level, and a conventionally known one can be used. Specifically, it is preferable to use a filtration device 41 provided with a ceramic membrane filter as disclosed in, for example, Japanese Patent No. 3822543. The ceramic membrane filter is suitable as a means for filtering the remaining hot water 42 because it can precisely filter dust, bacteria, sebum, and viruses.

Further, as shown in FIG. 3, the water heater 51 of the present invention preferably includes a mixing plug 37 for mixing tap water with the hot water 2 discharged from the hot water tank 11. The hot water 2 maintained at an arbitrary temperature in the hot water tank 11 needs to be adjusted to an appropriate temperature during use. As the adjustment method, tap water is directly poured into the hot water tank 11 to adjust the temperature of the hot water 2 in the hot water tank 11, or tap water is mixed with the hot water 2 discharged from the hot water tank 11 later. And a method of adjusting the temperature appropriately. As a method of mixing the tap water with the hot water 2 later, the hot water 2 discharged from the hot water tank 11 is mixed with the tap water at a faucet and adjusted to a desired temperature, and discharged from the hot water tank 11. A method of supplying the hot water 2 to the faucet after previously mixing the hot water 2 with tap water supplied from a mixing plug 37 connected to the heat storage device 1 is exemplified. A water heater 51 having a mixing plug 37 as shown in FIG. 3 is preferable regardless of the type of the faucet and because it eliminates the trouble of adjusting the temperature at the faucet.

Furthermore, in the water heater 51 of the present invention, it is preferable that the outside of the third tank 13 of the heat storage device 1 is covered with a heat insulating material 38 as shown in FIG. Although the raw material of the heat insulating material 38 is not specifically limited, a cheap polystyrene foam etc. are used suitably. By setting it as such a structure, it can prevent suitably that the thermal storage apparatus 1 is received from external temperature.

The heat storage device and the water heater provided with the heat storage device according to the present invention are low environmental load and space-saving hot water supply systems with reduced initial investment and running costs compared to conventional ones, regardless of whether they are for home use or for business use. It can be suitably used.

1: heat storage device, 2: hot water, 3: water supply port, 8: slide member, 9: slide support, 10: O-ring, 11: first tank (hot water storage tank), 12: second tank, 13 : Third tank, 14: upper surface opening, 15: plate member, 16, through bolt, 19: float valve, 20: heat insulating member, 20a: heat insulating material, 20b: reflecting material, 21: first vacuum heat insulating material Space, 22: second vacuum insulation space, 30: water supply means, 31: drainage means, 32: heating means, 33: stirring means, 34: temperature measurement means, 35: water detection means, 36: air input means, 37 : Mixing stopper, 38: Heat insulating material, 41: Filtration device, 42: Remaining hot water, 51: Hot water heater.

Claims

A heat storage device comprising a hot water storage tank surrounded by a heat insulating portion around the entire outer periphery, wherein the heat insulating portion comprises at least two layers of vacuum heat insulating space, and a heat insulating member is enclosed in the vacuum heat insulating space, Water supply means for supplying water into the hot water storage tank, heating means for heating the water supplied into the hot water storage tank to obtain hot water at a predetermined temperature, and drainage means for discharging the hot water from the hot water storage tank; An upper surface opening having a float valve is formed on the upper surface of the hot water storage tank as the only opening connecting the inside and the outside of the hot water storage tank, the water supply means, the heating means, and the drainage means are A heat storage device that enters and exits the hot water storage tank through the upper surface opening.
By providing a second tank outside the hot water storage tank which is the first tank, a first vacuum heat insulating space is formed between the first tank and the second tank, and the second tank By providing a third tank further outside, a second vacuum insulation space is formed between the second tank and the third tank, and the first vacuum insulation space and the second vacuum are formed. The heat storage device according to claim 1, wherein the heat insulating member is sealed in a heat insulating space so as to cover the first tank and the second tank, respectively.
The heat storage device according to claim 1 or 2, wherein the heat insulating member is a heat insulating panel obtained by sandwiching and sealing a heat insulating material inside a two-layer reflecting material.
The heat storage device according to claim 2 or 3, wherein the first tank, the second tank, and the third tank are made of a mirror-finished metal.
The water supply means includes a slide support base having a cylindrical space on the inside above the upper surface opening, and a slide member operable inside the slide support base in the vertical direction via an O-ring. Each of the heating means and the drainage means is at least partially housed in the slide member, and the vertical movement of the slide member and the opening and closing of the float valve at the upper surface opening The heat storage device according to any one of claims 1 to 4, wherein the water supply means, the heating means, and the drainage means can enter and exit the hot water storage tank by synchronizing with each other.
The heat storage unit according to any one of claims 1 to 5, wherein the water supply means is a tubular member having a water supply port near a lower end thereof, and is capable of supplying the water near a bottom surface in the hot water storage tank. apparatus.
The heat storage device according to any one of claims 1 to 6, wherein the heating means is a movable heating means capable of controlling the operation of the whole or a part of the hot water storage tank.
The heat storage device according to any one of claims 1 to 7, further comprising stirring means capable of stirring the hot water in the hot water storage tank.
The heat storage device according to claim 8, wherein the stirring means is a movable stirring means capable of controlling the operation of the whole or a part of the hot water storage tank.
Temperature measuring means for measuring the temperature of the hot water in the hot water tank, water detection means for detecting the presence of the hot water at a predetermined height position in the hot water tank, and air input for sending air into the hot water tank The heat storage device according to any one of claims 5 to 9, wherein at least one of the means is provided in a state in which at least a part thereof is housed in the slide member.
The heat storage device according to any one of claims 1 to 10, wherein the hot water storage tank has a substantially rectangular parallelepiped shape elongated in a vertical direction.
A water heater provided with the heat storage device according to any one of claims 1 to 11.
The hot water heater according to claim 12, further comprising a filtering device that allows the remaining hot water to be circulated and used by filtering the remaining hot water in the bathtub and guiding it to the heat storage device.
The water heater according to claim 13, wherein the filtration device includes a ceramic membrane filter.