JP4876984B2 - Heat storage device - Google Patents

Description

  The present invention relates to a heat storage device used for hot water supply and heating.

  Conventionally, this type of heat storage device is filled with a heat storage capsule containing a latent heat storage agent and water into a heat storage tank, and hot water heated by a heat source is introduced from the upper part of the heat storage tank and heat exchange with the heat storage capsule is performed at a low temperature. Heat is stored by taking out water from the lower part of the heat storage tank and circulating it to the heat source, and heat is supplied to the lower part of the heat storage tank, heat exchanged with the heat storage capsule, and then taken out from the upper part of the heat storage tank as hot water to provide heat load such as hot water supply. (For example, see Patent Document 1).

  FIG. 10 shows a conventional heat storage device.

As shown in FIG. 10, a heat storage tank 101, a spherical heat storage capsule 104 provided in the heat storage tank 101 and provided with a space 102 and filled with a latent heat storage agent 103, and hot water in the heat storage tank 101 are circulated. It is comprised from the circulation pump 105, the heat source 106 which gives heat to the hot water which flowed by the effect | action of the circulation pump 105, the water supply pipe | tube 107 which supplies water to the thermal storage tank 101, and the hot water supply pipe | tube 108 which takes out hot water from the thermal storage tank 101. ing.
JP 2004-324995 A

  However, in the conventional configuration, the volume ratio of the heat storage capsule 104 occupying the heat storage tank 101 is low due to geometric restrictions, and the volume ratio of the latent heat storage agent occupying the entire apparatus is about 50% at most. Since the heat transfer performance of the capsule 104 is also low, there is a problem that the heat storage capacity is small.

  This invention solves the said conventional subject, and it aims at providing the thermal storage apparatus which is excellent in heat-transfer performance and has a large thermal storage capacity.

  In order to solve the above-described conventional problems, the heat storage device of the present invention is configured to form a flat plate heat storage body by standing a flat plate heat storage container for storing a latent heat storage agent in a vertical direction, and is in close contact with one surface of the flat plate heat storage body The planar heat generating member, the flat heat absorbing member in close contact with the other surface of the flat heat storing member, the heat storage temperature detecting means, and the control device for controlling the planar heat generating member are provided.

  With the above configuration, the heat storage device of the present invention improves the heat transfer performance in heat exchange between the flat plate heat storage body and the planar heating element and between the flat plate heat storage body and the flat plate heat absorption body, and the latent heat storage agent occupies the entire apparatus. The heat storage capacity of the heat storage device can be increased by increasing the volume ratio and improving the heat transfer performance.

The first invention is provided in close contact with the surface of the latent heat storage agent, a flat plate heat storage body configured by standing a flat plate heat storage container for storing the latent heat storage agent in a vertical direction, and the flat plate heat storage body. The sheet heating element, a plate-like heat absorber provided in close contact with the surface of the plate-like heat storage element facing the sheet heating element, the heat storage body temperature detection means, and the detection value of the heat storage body temperature detection means Accordingly, there is provided a control device for controlling the planar heating element, and a planar heat absorbing body in which a plurality of the planar heat storage elements provided in close contact with the planar heating element on one side are provided in close contact with the surface in series. When the load is large, all the sheet heating elements are heated and stored in the flat plate heat absorption element. When the load is small, some sheet heating elements located on the upstream side of the water supply path are operated. Monodea to, which is accumulated in only the flat heat storage member which is in close contact thereto, controls the heat storage amount according to the load .

  With this configuration, the present invention sets the thickness of the flat plate heat storage body larger than the thickness of the planar heating element and the flat plate heat absorption body, so that the latent heat occupying the entire apparatus is not restricted by the geometric shape. The volume ratio of the heat storage agent will be expanded, and the heat storage performance of the heat storage device can be increased by further improving the heat transfer performance by bringing the flat plate heat storage body, the planar heating element and the flat plate heat storage body into close contact with each other. it can.

  With this configuration, the present invention sets the optimum heat storage amount according to the load by controlling the number of planar heating elements to be heated according to the load and changing the number of flat plate heat storage elements to store the heat. The amount of heat release in the state can be reduced, and highly efficient heat storage operation can be performed.

The second invention is a container in which one end is in contact with the inner surface of the container of the flat plate heat storage body with which the planar heating element is in contact, and the other end is in contact with the flat plate heat absorption body, particularly within the flat plate heat storage body of the first invention. It is provided with a heat transfer body configured in contact with the inner surface.

  With this configuration, the present invention greatly improves the heat transfer performance inside the flat plate heat storage body, and the heat storage capacity of the heat storage device can be increased.

In the third aspect of the invention, a flat endothermic body having an endothermic area larger than the heating area of the planar heating element of any one of the first and second aspects of the invention is provided.

  With this configuration, the present invention ensures the heat exchange area in both the solid and liquid states of the latent heat storage agent, and can perform high-performance operation in both the heat storage operation and the heat radiation operation.

In the fourth aspect of the invention, the flat plate heat storage body of any one of the first to third aspects of the invention is degassed and filled with the latent heat storage agent inside the elastic heat storage container.

  With this configuration, the increased volume generated when the latent heat storage agent changes its state from solid to liquid is absorbed, and the present invention can prevent damage to the heat storage container and realize a highly reliable heat storage operation.

In a fifth aspect of the invention, in particular, a plurality of rows of flat plate-like heat storage elements that are in close contact with one surface of any one of the first to fourth inventions and that are in close contact with the planar heating element on the other surface. It is provided by laminating.

  With this configuration, the present invention heats and stores the flat plate heat storage bodies on both sides with one flat plate heat storage body, and absorbs heat from the flat plate heat storage bodies on both sides with one flat plate heat storage body. The heat storage and heat dissipation operation can be performed.

6th invention pressurizes the contact surface of the flat heat storage body and flat heat absorption body of any one invention of 1st- 5th invention especially, and the contact surface of a flat heat storage body and a surface heating element. Adhesion reinforcement means is provided.

  By this structure, this invention will reduce the thermal resistance of a contact surface, and can improve heat transfer performance.

The seventh aspect of the invention is particularly a casing that houses the planar heating element, the flat plate heat storage element, and the flat plate heat absorption element of any one of the first to sixth aspects of the invention, and a heat insulating agent that covers the inner surface of the casing. Are provided.

  With this configuration, the present invention simplifies the configuration and reduces the amount of heat dissipation, and can realize a high-performance apparatus with excellent maintainability such as component replacement.

The eighth aspect of the invention is particularly a casing for storing the planar heating element, the flat plate heat storage element, and the flat plate heat absorption body according to any one of the first to seventh aspects of the invention, and a pressure reducing device for reducing the pressure inside the casing. Are provided.

  With this configuration, the present invention prevents condensation inside the casing and improves heat insulation, and can realize a highly reliable and high performance apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.
(Embodiment 1)
FIG. 1 shows a configuration diagram of a heat storage device according to Embodiment 1 of the present invention.

  In FIG. 1, a flat plate heat storage body 9 is configured by standing a flat plate heat storage container 10 that stores a latent heat storage agent 3 in a vertical direction, and a planar heating element 11 and a flat plate heat absorption body 12 are formed in a flat plate shape. Provided in close contact with both opposing surfaces of the heat storage body 9, provided with a control device 14 for controlling the planar heating element 11 according to the detection value of the heat storage body temperature detection means 13 provided on the flat plate heat storage body 9, A bypass pipe 15 connecting the water supply pipe 7 and the hot water supply pipe 8 to the flat heat absorber 12 and connecting the water supply pipe 7 and the hot water supply pipe 8 is provided, and a mixing valve 16 is provided at the junction of the hot water supply pipe 8 and the bypass pipe 15. The hot water supply temperature detecting means 17 is provided at the outlet of the hot water supply pipe 8.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, in the heat storage operation, when the detected value of the heat storage body temperature detection means 13 is equal to or lower than a predetermined temperature, the control device 14 supplies power to the on-surface heating body 11 to generate heat, thereby heating the flat plate heat storage body 9. The internal latent heat storage agent 3 is melted to store heat.

  In the heat radiation operation, when a load is generated, when the detected value of the heat storage body temperature detection means 13 is equal to or higher than a predetermined temperature, low temperature water is caused to flow through the hot water supply pipe 8 to the flat heat absorption body 12 to thereby generate a flat heat storage. The controller 9 absorbs heat from the body 9 to obtain high-temperature water, and mixes it with the low-temperature water supply through the bypass pipe 15 by the mixing valve 16 provided in the hot-water supply pipe 8 so that the value of the hot-water supply temperature detection means 17 becomes a predetermined temperature. 14, the mixing valve 16 is controlled.

As described above, in the present embodiment, the plate-shaped heat storage body 9 is configured by standing the plate-shaped heat storage container 10 that stores the latent heat storage agent 3 in the vertical direction, and is planar on both vertical surfaces of the plate-shaped heat storage body 9. By adopting a configuration in which the heating element 11 and the plate-like heat absorbing body 12 are in close contact with each other, the volume ratio of the latent heat storage agent 3 occupying the entire apparatus is increased without being restricted by a geometric shape such as a spherical capsule. Thus, by increasing the ratio of the latent heat storage agent 3 having a large heat capacity, the heat storage capacity of the entire apparatus can be increased and at the same time the heat transfer performance in heat storage and heat dissipation can be improved.
(Embodiment 2)
FIG. 2 shows a configuration diagram of the heat storage device according to the second embodiment of the present invention.

  In FIG. 2, the flat plate heat storage body 9 is configured by providing a first flat plate heat storage body 9 a, a second flat plate heat storage body 9 b, and a third flat plate heat storage body 9 c in series on the surface of the flat plate heat absorption body 12. The first planar heating element 11a, the second planar heating element 11b, and the third planar heating element 11c, the first planar thermal storage element 9a, the second planar thermal storage element 9b, and the third planar thermal storage element 9c. Are provided on the corresponding surfaces.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the load is large, in the heat storage operation, the first planar heating element 11a, the second planar heating element 11b, and the third planar heating element 11c are simultaneously supplied with power from the control device 14 to generate heat. Thus, heat is stored in the three heat storage bodies of the first flat plate heat storage body 9a, the second flat plate heat storage body 9b, and the third flat plate heat storage body 9c, and low temperature water is supplied to the flat plate heat absorption body 12 in the heat radiation operation. By doing so, heat is absorbed in order from the first flat plate heat storage body 9a to the second flat plate heat storage body 9b and the third flat plate heat storage body 9c on the upstream side, and a large amount of heat storage is absorbed and used.

  On the other hand, when the load is small, only the first planar heating element 11a is energized to store heat only to the first flat plate heat storage body 9a, and low temperature water is supplied to the flat plate heat absorption body 12 during the heat radiation operation. Heat is absorbed from the flat plate heat storage body 9a and supplied to the load.

As described above, in the present embodiment, the flat plate heat storage body 9 and the planar heat generating body 11 are divided on the surface of the flat plate heat absorbing body 12, and a plurality of them are provided in series. When the load is large, all the sheet heating elements 11 are heated and stored in the plate-like heat absorbing body 12 for use. When the load is small, the first sheet heating element 11a is operated to operate the first plate-like heat storage element. The heat is stored only in 9a and used, and the amount of heat stored can be controlled according to the load, and the amount of heat released from the device can be reduced to perform a highly efficient heat storage operation.
(Embodiment 3)
FIG. 3 shows a configuration diagram of the heat storage device according to the third embodiment of the present invention.

  In FIG. 3, a heat transfer body 18 is formed by arranging a wire or a plate made of a material having excellent thermal conductivity such as copper or carbon-based material in a substantially horizontal direction inside the flat plate heat storage body 9. One end is in contact with the inner surface of the heat storage container 10 of the flat plate heat storage body 9 with which the heating element 11 is in contact, and the other end is in contact with the inner surface of the heat storage container 10 with which the flat plate heat absorption body 12 is in contact.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, during the heat storage operation, the sheet heating element 11 is heated to heat the contact surface of the flat plate heating element 9, and the sheet heating element 11 is passed through the heat transfer element 18 having a high thermal conductivity arranged in a substantially horizontal direction. It heats the latent heat storage agent 3 existing on the opposite side, and improves the heat transfer performance of the entire flat plate heat storage body 9.

As described above, in the present embodiment, the heat transfer body 18 having excellent heat conductivity is arranged in the vertical direction of the surface of the planar heating element 11 and in the flat heat storage body 9 in a substantially horizontal direction, One end is in contact with the inner surface of the heat storage container 10 of the flat plate heat storage body 9 with which the planar heating element 11 is in contact, and the other end is in contact with the inner surface of the heat storage container 10 with which the flat plate heat absorption body 12 is in contact. The latent heat storage agent 3 existing on the opposite side is quickly heated via the heat transfer body 18, and the latent heat storage agent 3 having a large heat storage capacity but low thermal conductivity is filled in the flat plate heat storage body 9. Even if it uses it, the influence of the thickness of the flat heat storage body 9 is little, and the apparatus excellent in heat-transfer performance is realizable.
(Embodiment 4)
FIG. 4 shows a configuration diagram of the heat storage device according to the fourth embodiment of the present invention.

  In FIG. 4, a flat plate heat storage body 9 is provided with a sheet heating element 11 in close contact with one surface, and a plate heat absorption body 12 is provided in close contact with the other opposing surface. The heat absorption area in close contact with 9 is configured to be larger than the heating area in close contact with the flat plate heat storage body 9 of the planar heating element 11.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, since the latent heat storage agent 3 is in a solid state at the start of the heat storage operation, the latent heat storage agent 3 corresponding to the entire surface of the planar heating element 11 comes into contact with it, and melts into a liquid state at the end of the heat storage operation. Thus, the surface of the latent heat storage agent 3 becomes larger than the contact surface of the planar heating element 11 by increasing the volume of the latent heat storage agent 3 by about 10% from the volume of the solid state.

  On the other hand, since the contact area of the flat plate-like heat absorbing body 12 on the opposite side is larger than the contact surface with the sheet-like heat generating body 11, all the contact surfaces of the liquid latent heat storage agent 3 are in contact with the plate-like heat absorbing body 12. It becomes a state to do.

As described above, in the present embodiment, the heat absorption area of the flat plate heat absorber 12 in contact with the flat plate heat storage body 9 is larger than the heating area of the planar heat generator 11 in contact with the flat plate heat storage body 9. By doing so, heat transfer performance can be ensured in both heat storage operation and heat radiation operation, and highly efficient operation can be realized.
(Embodiment 5)
FIG. 5 shows a configuration diagram of the heat storage device according to the fifth embodiment of the present invention.

  In FIG. 5, the plate-like heat absorber 12 is degassed and filled with a latent heat storage agent 3 in a heat storage container 10 formed of a bag-like film having a volume of 1.1 times or more of the volume of the latent heat storage agent 3 to be filled. One surface is in close contact with the planar heating element 11 and the opposite one surface is in close contact with the flat plate heat absorbing body 12.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, since the latent heat storage agent 3 is filled with an amount having a contact area that is substantially equal to the heating surface of the planar heating element 11 in a solid state, one side of the latent heat storage agent 3 is heated at the start of the heat storage operation. As the heat builds up, the liquid ratio increases and the overall volume increases. The molten latent heat storage agent 3 is accumulated downward from the top of the heat storage container 10 in order, and the entire interior of the heat storage container 10 is filled with liquid when the heat storage ends. At this time, since the heat storage container 10 is manufactured with a large volume capable of absorbing the volume of the liquid in advance, the volume is increased in a state of protruding from the heating surface as the liquid increases.

As described above, in this embodiment, the elastic heat storage container 10 having a larger volume than the liquid latent heat storage agent 3 is degassed and filled with the latent heat storage agent 3 to form a flat plate heat absorber 12. The heat storage container 10 absorbs an increase in volume that occurs when the latent heat storage agent 3 changes from a solid to a liquid, so that the heat storage container 10 can be prevented from being damaged, and a safe and reliable device can be realized.
(Embodiment 6)
FIG. 6 shows a configuration diagram of the heat storage device according to the sixth embodiment of the present invention.

  In FIG. 6, the first flat plate heat storage body 9 a provided by laminating a plurality of rows of flat plate heat storage elements that are in close contact with a flat plate heat absorption body on one side and in close contact with the planar heat generation element on the other surface is the first flat plate heat storage body 9 a. The planar heat-absorbing body 12a is in close contact with the sheet heating element 11 on one side facing, and the second plate-shaped heat storage element 9b is in contact with the other side of the sheet heating element 11 on one side and is opposed to the second side. The flat endothermic body 12b is closely attached.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the heat storage operation stores heat by simultaneously heating the first flat plate heat storage body 9 a and the second flat plate heat storage body 9 b with the planar heating element 11, and the heat dissipation operation stores the first flat plate heat absorption body 12 a with the water supply pipe 7. The second flat plate heat absorber 12b is supplied with water, absorbed from the first flat plate heat storage body 9a and the second flat plate heat storage body 9b, and taken out from the hot water supply pipe 8 as hot water.

  As described above, in the present embodiment, the first and second planar heat storage bodies 9a and 9b and the first and second planar heat absorption bodies 12a and 11b are in close contact with both surfaces of the planar heating element 11. By making it the structure laminated | stacked in order, it is set as the structure which heat-stores in the two 1st and 2nd flat plate heat absorption bodies 12a and 12b with the one planar heating element 11, and makes the flat plate heat absorption body 12 according to a load. By stacking a plurality of sheets in order, an apparatus suitable for many applications can be realized with a simple structure.

In addition, one flat plate heat absorption body is provided between the first planar heat storage body 9a and the second planar heat storage body 9b,
It is also possible to employ a configuration in which two planar heating elements are provided on both sides of the first planar heat storage body 9a and the second planar heat storage body 9b.
(Embodiment 7)
FIG. 7 shows the block diagram of the heat storage apparatus of Embodiment 7 of this invention.

  In FIG. 7, the adhesion reinforcing means 19 is obtained by fastening a reinforcing plate 20a and a reinforcing plate 20b with a fastening body 21a and a fastening body 21b such as bolts and nuts, and a flat plate heat storage body 9, a sheet heating element 11, and a flat plate shape. The heat-absorbing body 12 is closely laminated and sandwiched between the reinforcing plate 20a and the reinforcing plate 20b from both sides and tightened with the fastening body 21a and the fastening body 21b.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, in a state where the planar heating element 11 and the planar heat absorbing body 12 are tightly held on both surfaces of the planar heat storage body 9, the reinforcing plate 20 a and the reinforcing plate on the outer side of the planar heat absorbing body 12 are disposed outside the planar heating element 11. 20b is provided, the fastening body 21a and the fastening body 21b are arranged at both ends, and the fastening body 21a and the fastening body 21b are fastened, whereby the contact surface of the flat plate heat storage body 9 and the flat plate heat absorption body 12 and the flat plate heat storage body 9 and the surface heating element 11 are pressed.

As described above, in the present embodiment, the flat plate heat storage body 9, the planar heating element 11, and the flat plate heat absorption body 12 are adhered and laminated, and the adhesion reinforcing means 19 is provided outside, thereby providing the flat plate heat storage body 9. And the contact surface of the surface heating element 11 and the contact surfaces of the flat plate heat storage body 9 and the flat plate heat absorption body 12 are simultaneously pressurized, and the contact heat resistance is enhanced by enhancing the contact degree of the contact surface. The heat transfer performance can be improved.
(Embodiment 8)
FIG. 8 shows a configuration diagram of the heat storage device according to the eighth embodiment of the present invention.

  In FIG. 8, a housing 22 has an inner surface covered with a heat insulating material 23, components for closely laminating the plate-shaped heat storage body 9, the sheet-like heating element 11, and the plate-shaped heat absorption body 12, and the water supply pipe 7. In addition, a pipe composed of a hot water supply pipe 8, a bypass pipe 15 and a mixing valve 16 is housed inside.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, components such as the flat plate heat storage body 9, the planar heating element 11, the flat plate heat absorber 12 and the like rise in temperature during heat storage operation and radiate heat to the outside. Since it is housed in the covered housing 22, the temperature of the air inside the housing 22 is increased, the heat dissipation to the outside of the housing 22 is greatly reduced, and the temperature of the components and the atmosphere is eventually reduced. As the difference decreases, the heat dissipation from the components themselves will also decrease.

  As described above, in the present embodiment, components such as the flat plate heat storage body 9, the planar heating element 11, and the flat plate heat absorption body 12 are stored in the housing 22 whose inner surface is covered with the heat insulating material 23. By doing so, the amount of heat radiation to the outside is reduced, and a highly efficient heat storage operation can be performed.

In addition, since a heat insulating material or the like is not directly attached to the component parts, maintenance such as part replacement can be easily performed.
(Embodiment 9)
FIG. 9 shows a configuration diagram of the heat storage device according to the ninth embodiment of the present invention.

  In FIG. 9, the decompression device 24 is provided with an ejector 26 that opens the suction port 25 inside the housing 22 in the water supply pipe 7, and a gas-liquid separator that opens the discharge pipe 27 to the outside of the housing 22. 28 is provided in the hot water supply pipe 8.

  About the thermal storage apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when water is supplied to the water supply pipe 7, the ejector 26 sucks air inside the housing 22 from the suction port 25, passes through the flat plate heat absorber 12, and flows into the gas-liquid separator 28 provided in the hot water supply pipe 8. After the air separated by the liquid separator 28 is discharged from the discharge pipe 27 to the outside of the housing 22, only hot water is taken out from the hot water supply pipe 8.

  As described above, in the present embodiment, by providing the decompression device 24 that exhausts the air inside the housing 22 to the outside, the inside of the housing 22 is decompressed, and condensation inside the housing 22 is prevented. It can prevent and improve durability and heat insulation.

  Further, the same effect can be obtained by using an electric suction pump or the like instead of the ejector 26.

  As described above, the heat storage device according to the present invention has a large heat storage capacity and can be operated with high efficiency. Therefore, the heat storage device can be used for home heating, bathroom heating drying, clothes dryers, industrial waste heat recovery devices, and the like. Is also applicable.

Configuration diagram in Embodiment 1 of the present invention Configuration diagram in Embodiment 2 of the present invention Configuration diagram in Embodiment 3 of the present invention Configuration diagram in Embodiment 4 of the present invention Configuration diagram in Embodiment 5 of the present invention Configuration diagram in Embodiment 6 of the present invention Configuration diagram in Embodiment 7 of the present invention Configuration diagram in Embodiment 8 of the present invention Configuration diagram of Embodiment 9 of the present invention Configuration diagram of conventional heat storage device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat storage tank 2 Space 3 Latent heat storage agent 4 Heat storage capsule 5 Circulation pump 6 Heat source hot water supply pipe 7 Water supply pipe 8 Hot water supply pipe 9 Flat plate heat storage body 9a First flat plate heat storage body 9b Second flat plate heat storage body 9c Third flat plate heat storage Body 10 Heat storage container 11 Planar heating element 11a First planar heating element 11b Second planar heating element 11c Third planar heating element 12 Flat plate heat sink 12a First flat plate heat sink 12b Second flat plate heat sink 13 Heat storage body temperature detection means 14 Controller 15 Bypass pipe 16 Mixing valve 17 Hot water supply temperature detection means 18 Heat transfer body 19 Adhesion reinforcement means 20a Reinforcement plate 20b Reinforcement plate 21a Fastening body 21b Fastening body 22 Housing 23 Insulation material 24 Decompression means 25 Inhalation Pipe 26 Ejector 27 Discharge pipe 28 Gas-liquid separator

Claims (8)

A latent heat storage agent, a flat plate heat storage body configured by vertically setting a flat plate heat storage container for storing the latent heat storage agent, and a planar heating element provided in close contact with the surface of the flat plate heat storage body, The plate-shaped heat absorber provided in close contact with the surface of the plate-shaped heat storage body facing the sheet-shaped heat generator, the heat storage body temperature detection means, and the sheet heat generation according to the detection value of the heat storage body temperature detection means A control device for controlling the body and a plate-like heat absorbing body provided with a plurality of the plate-like heat storage bodies provided in close contact with the surface heating element in series on one side are provided, and when the load is large When all the sheet heating elements are heated to store heat in the plate-like heat absorption body and the load is small, a part of the sheet heating elements located on the upstream side of the water supply path is operated and closely adhered thereto. A heat storage device that stores heat only in a flat plate heat storage body and controls the amount of heat stored according to the load . A heat transfer body is provided in which one end is in contact with the inner surface of the heat storage container of the flat plate heat storage body to which the planar heating element is in close contact, and the other end is in contact with the inner surface of the heat storage container in contact with the flat plate heat absorption body. The heat storage device according to claim 1 . The heat storage device according to claim 1 or 2 , wherein the flat plate heat absorber having a heat absorption area larger than a heating area of the planar heat generator is provided. The heat storage device according to any one of claims 1 to 3 , wherein the flat plate heat storage body in which the latent heat storage agent is deaerated and filled is provided inside the elastic heat storage container . 5. The flat plate heat storage body according to any one of claims 1 to 4 , wherein the flat plate heat storage body that is in close contact with one surface and the flat surface heating element is in close contact with the other surface is provided in a plurality of rows. Heat storage device. In any 1 item | term of the Claims 1-5 which provided the contact | adhesion reinforcement means which pressurizes the contact surface of the said flat heat storage body and the said flat heat absorption body, and the contact surface of the said flat heat storage body and the said surface heating body. The heat storage device described. The heat storage according to any one of claims 1 to 6, further comprising: a casing that houses the planar heating element, the flat plate heat storage body, and the flat plate heat absorption body; and a heat insulating agent that covers the inner surface of the casing. apparatus. The said planar heating element, the said flat heat storage body, the said housing | casing which accommodates the said flat heat sink, and the decompression device which decompresses the said housing | casing inside are provided. Heat storage device.

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