JP4606082B2 - Heat storage device - Google Patents

Description

  The present invention relates to a heat storage device to which a heat medium is supplied and discharged, and more particularly to a heat storage device that includes a heat storage agent and is also suitable as a vehicle heat storage device.

  For example, in a vehicle, engine coolant that has become hot due to vehicle travel is temporarily stored in a heat storage device when the engine is stopped, and the coolant stored in the heat storage device is supplied to the engine at the next engine start. Thus, the engine is preheated when the engine is started to increase the engine operating efficiency.

  As a conventional heat storage device, there is a vacuum heat insulation type device including a heat insulation container in which a space between an inner container and an outer container is evacuated. However, the vacuum insulation type has a problem that it is difficult to maintain a high airtightness between the inner container and the outer container.

  In addition, as a heat storage device in an ice heat storage system that efficiently uses electric power, a plurality of heat storage bodies containing a heat storage agent together with a supercooling preventive agent in a cylindrical container body that is long in the vertical direction are used as antifreeze liquid in the heat insulation container. An ice heat storage tank having a vertically submerged structure has been proposed.

  However, in the ice heat storage tank, since the heat storage body has a shape that is long in the vertical direction and is installed vertically in the heat insulation container, a temperature difference is easily generated between the heat storage body and the ice storage tank. When standing still, convection occurs in the antifreeze liquid (heat medium) in contact with the heat storage body, and a high temperature area is formed above the antifreeze liquid (heat medium), and the amount of heat released from the high temperature area to the outside of the ice storage tank increases. In addition, there is a possibility that the heat retention is impaired.

  Further, in the ice heat storage tank, the container main body that stores the heat storage agent has a cylindrical shape, so that the distance between the heat storage agent and the heat medium is increased at the center of the container main body, so that the rapid heat storage by the heat storage agent is performed. The exchange cannot be performed efficiently. Therefore, the ice heat storage tank is used in such a way that a new heat medium flows into the heat storage device when taking out the heat medium from the heat storage device, for example, the vehicle heat storage device using engine coolant as the heat medium, There are also problems that are not suitable for applications that require rapid heat exchange.

JP 2001-50675 A JP 2001-336892 A

  This invention is made | formed in view of the said point, and it aims at provision of the thermal storage apparatus with high heat retention and quick heat exchange.

The invention of claim 1 includes a heat medium storage container to which a heat medium is supplied and discharged, concentric inner tubes and outer tubes, and the inner tube and the outer tube constitute a heat medium supply channel, The front end of the heat medium supply channel is closed, the other end is opened as a heat medium supply inlet, and the inner tube is opened at the front end as a heat medium discharge inlet and the other end as a heat medium discharge outlet. The heat medium discharge inlet and the heat medium discharge outlet constitute a heat medium discharge flow path, and a plurality of heat medium supply outflow holes communicating with the heat medium supply flow path are formed on the outer peripheral surface of the outer tube. A center pipe having a double pipe structure formed, and a plate-shaped heat storage body in which a heat storage agent is stored in a plate-shaped heat storage agent storage container in which a center tube insertion hole is formed. The heat medium discharge inlet is vertically disposed in the medium container, and the heat medium discharge inlet is separated from the upper surface of the heat medium container. And the heat medium supply inlet protrudes from the lower surface of the heat medium container to the outside of the heat medium container, and is inserted into the central tube insertion hole in the plate-shaped heat storage body. The central tube is inserted, and a plurality of the plate-like heat storage members are provided in the heat medium container substantially horizontally apart from each other, and the uppermost one of the plurality of plate-like heat storage members is A heat medium circulation gap is provided between the outer peripheral ends of the plurality of plate-shaped heat accumulators and the inner side surface of the heat medium container, the distance from the inner surface of the upper surface of the heat medium container. The heat storage device is characterized in that the heat medium supply outflow hole in the outer pipe is located between the plate-shaped heat storage bodies.

The invention of claim 2 is the invention according to claim 1 , wherein the plate-shaped heat storage agent container is a three-layer structure of a plastic outer surface layer, an intermediate layer made of metal foil, and a weldable plastic inner layer. The upper half and the lower half are made of, and a part of the upper half and the lower half are respectively welded by the inner surface layer.

The invention of claim 3 is characterized in that, in claim 1 or 2 , the heat storage agent has a melting point of 60 ° C to 90 ° C.

According to the first to third aspects of the present invention, a plurality of the plate-shaped heat storage elements are separated from each other in the vertical direction and are housed in the heat medium container in a layered manner (including a substantially horizontal state). It is possible to prevent the distance between the upper part and the lower part of the plate from becoming large, and it is difficult to cause a temperature difference between the upper and lower sides of the plate heat storage body. This makes it difficult for convection to occur in the heat medium in contact with the plate-shaped heat accumulator, making it difficult for the heat medium in the entire heat medium container to be biased in the high temperature region, and suppressing heat dissipation from the high temperature region to the outside of the heat storage device. Yes, it can increase the heat retention. Furthermore, since the plate-shaped heat storage body can be made flatter than the cylindrical heat storage body, the distance between the heat storage agent at the center in the heat storage body and the heat medium is closer than that in the case of the cylindrical heat storage body. Heat exchange can be performed efficiently.

Further, according to the first aspect of the invention, in addition to the common effect 3 from the claim 1 the following effect. That is, in claim 1 , since the heat medium is supplied from the heat medium supply outflow hole of the central tube between a plurality of plate-like heat storage bodies that are separated from each other in the vertical direction, the flow path of the heat medium is short-circuited. It is difficult for some of the plate-like heat storage bodies to come into contact with the heat medium, and it is possible to ensure contact between all of the plate-like heat storage bodies and the heat medium, so that heat exchange can be performed effectively. Furthermore, in the invention of claim 2, the heat medium supply inlet, the heat medium discharge outlet, and the heat medium supply flow path with respect to the heat medium container are provided only by providing one central tube in the heat medium container. A heat medium discharge channel can be formed, and the number of parts can be reduced.

According to the invention of claim 2 , in addition to the effects common to the claims 1 to 3 , the following effects are obtained. That is, in claim 2 , the plate-like heat storage agent container is an upper half body having a three-layer structure of an outer surface layer made of plastic, an intermediate layer made of metal foil, and an inner surface layer made of weldable plastic. And the lower half is composed of a structure in which a part of the upper half and the lower half are welded by the inner surface layer, so that by adjusting the thickness of the metal foil, plastic deformation of the metal foil can be achieved. The upper half and the lower half can be easily shaped using this.

Further, according to the third aspect of the invention, in addition to the common effect 3 from the claim 1 the following effect. That is, in claim 3 , since the heat storage agent has a melting point of 60 ° C. to 90 ° C., a heat medium having a temperature higher than the melting point of the heat storage agent (for example, high-temperature engine cooling water after the vehicle travels) accommodates the heat medium. When the heat storage agent melts by flowing into the container, the heat storage agent absorbs the heat of fusion from the heat medium (engine cooling water), stores the heat energy and keeps it warm, and removes the heat medium from the heat medium container. When the heat medium having a temperature lower than the melting point of the heat storage agent (low-temperature engine cooling water supplied when the engine is started from the vehicle stopped state) flows into the heat medium container and the heat storage agent solidifies, The heat storage agent releases solidification heat (latent heat), and the heat medium (engine cooling water) can be heated by the released heat.

Hereinafter, embodiments of the present invention will be described in detail. 1 is a perspective view of a heat storage device according to the first embodiment of the present invention, FIG. 2 is a sectional view taken along the line 2-2 in FIG. 1, FIG. 3 is a sectional view taken along the line 3-3 in FIG. FIG. 5 is a perspective view of a plate-like heat storage body, a sectional view of 5-5, and FIG. 6 is a perspective view of a heat storage device according to a reference example . 7 7-7 cross-sectional view of FIG. 6, FIG. 8 is section 8-8 of FIG. 6, FIG. 9 is a perspective view of a plate-shaped heat storage member and a center tube and first and second spacers reference example.

  The heat storage device 10 according to the first embodiment shown in FIGS. 1 to 3 includes a heat medium storage container 11, a center tube 21, and a plate-shaped heat storage body 41.

  The heat medium storage container 11 is a container through which a heat medium is supplied and discharged. In the illustrated example, the heat medium storage container 11 is a cylindrical container having an upper surface 12 and a lower surface 13, and the heat medium can be stored therein. The heat medium container 11 is made of an appropriate material such as plastic, but is preferably made of a heat insulating material. For example, the outer periphery of the inner container made of plastic is surrounded by a foam heat insulating material or a vacuum heat insulating material, or the outer periphery of the heat insulating material is further covered with an outer layer such as a metal foil. The heat medium storage container 11 may be a vacuum heat insulation type in which a vacuum is formed between the inner container and the outer container.

  The central tube 21 is made of plastic or the like and has a double tube structure including a concentric inner tube 22 and an outer tube 29. A heat medium supply flow path 30 is formed between the inner tube 22 and the outer tube 29. The heat medium supply channel 30 has a tip 31 closed and the other end 32 opened as a heat medium supply inlet 33. The inner pipe 22 has a distal end 23 opened as a heat medium discharge inlet 24 and the other end 25 opened as a heat medium discharge outlet 26, and the heat medium discharge inlet 24 and the heat medium discharge outlet 26. The space 26 forms a heat medium discharge channel 27. As shown in FIGS. 3 and 4, heat medium supply outflow holes 35 communicating with the heat medium supply flow path 30 are formed on the outer peripheral surface of the outer tube 29 at predetermined intervals in the vertical direction of the outer tube 29. A plurality of radial lines are formed.

  The central tube 21 is vertically arranged in the heat medium accommodating container 11 from the center of the lower surface 13 of the heat medium accommodating container 11, and the heat medium discharge inlet 24 is separated from the upper surface 12 of the heat medium accommodating container 11. The heat medium discharge outlet 26 is located outside the heat medium container 11 from the center of the lower surface 13 of the heat medium container 11.

  As shown in FIG. 5, the plate-shaped heat storage body 41 is formed by storing a heat storage agent 55 in a plate-shaped heat storage agent storage container 42. The plate-shaped heat storage agent storage container 42 in this example has a disk shape (disk shape) in which a central tube insertion hole 43 is formed in the center, and an inner flange portion 44 is formed at the periphery of the central tube insertion hole 43. An outer flange 45 is formed on the outer peripheral edge. The heat storage agent storage container 42 includes an upper half 46 and a lower half 50, and a heat storage agent 55 is stored in a space between the upper half 46 and the lower half 50.

  The upper half 46 and the lower half 50 have a three-layer structure of plastic outer surface layers 47, 51, intermediate layers 48, 52 made of metal foil, and weldable plastic inner layers 49, 53. The upper half body 46 and the lower half body 50 are integrated by welding the inner surface layers 49 and 53 at the inner flange portion 44 and the outer flange portion 45. The outer surface layers 47 and 51 function as a protective layer and are made of a plastic film. The intermediate layers 48 and 58 made of the metal foil are for forming the shapes of the upper half 46 and the lower half 50, and an appropriate one such as an aluminum foil is selected as the metal foil. The inner surface layers 49 and 53 are used for welding and integrating the upper half 46 and the lower half 50, and are made of a plastic film that can be welded by heating, such as an olefin resin film.

  The heat storage agent 55 preferably has a melting point of 60 ° C to 90 ° C. As the heat storage agent 55, an appropriate material such as a paraffin-based latent heat storage agent can be used. If the melting point of the heat storage agent 55 is set to 60 ° C. to 90 ° C., the engine coolant of the vehicle exceeds 90 ° C. due to traveling of the vehicle and becomes lower than 60 ° C. due to the stop, so that the engine as a heat medium of the heat storage device 10 If the cooling water is used, the heat storage agent 55 can be melted or solidified by the engine cooling water, and at the time of the melting, the heat of fusion is absorbed from the engine cooling water in the heat storage device 10 to store thermal energy in the heat storage agent 55. During the solidification, the heat of solidification can be released from the heat storage agent 55 to the engine cooling water in the heat storage device 10 to heat the engine cooling water.

  In the plate-shaped heat storage body 41, the central tube 21 is inserted into the center tube insertion hole 43, and a plurality of the plate-shaped heat storage bodies 41 are separated from each other through the first spacer 61 and the second spacer 71. And provided in the heat medium container 11 in a substantially horizontal layer shape. The uppermost one 410 in the plurality of plate-like heat storage bodies 41 is a position in the heat medium accommodation container 11 that is away from the inside of the upper surface 12 of the heat medium accommodation container 11. Further, between the outer peripheral ends of the plurality of plate-shaped heat accumulators 41 and the inside of the side surface 14 of the heat medium storage container 11, a heat medium distribution gap S is provided, respectively, and in the outer tube 29 of the center tube 21. The heat medium supply outflow hole 35 is positioned between the plate-shaped heat accumulators 41.

  As shown in FIG. 4, the first spacer 61 has an annular shape, and an annular base 62 having a diameter slightly smaller than the inner diameter of the heat medium accommodating container 11 and an upper surface of the annular base 62 at a required interval. A plurality of projecting parts 63 are provided. In the illustrated example, four protrusions 63 are provided at equal intervals. The protrusion 63 has a shape in which the lower half 65 of the outer surface 64 is flush with the outer peripheral surface of the annular base 63 and the upper half 66 protrudes outward in a stepped manner. About 67, it consists of the step shape of the lower stage 68, the middle stage 69, and the uppermost stage 70. FIG. The required number of first spacers 61 are stacked from the lower surface 13 in the heat medium accommodation container 11. At this time, the outer flange portion 45 of the plate-like heat storage body 41 is placed on the lower step 68 of the inner surface 67 of the first spacer 61, and the lower surface of the annular base portion 62 of the upper first spacer 61 is placed on the middle step 69. The outer flange portion 45 of the plate-like heat storage body 41 is sandwiched between the upper and lower first spacers 61, 61, and the outer peripheral end of the plate-like heat storage body 41 and the inside of the side surface 14 of the heat medium storage container 11. A gap S for circulating the heat medium is formed therebetween. Note that the upper portion of the lower first spacer 61 among the first spacers 61 adjacent to the upper and lower portions fits into the lower half 65 portion of the outer surface 64 of the upper first spacer.

  As shown in FIG. 4, the second spacer 71 has an annular shape, and a plurality of annular base portions 72 that contact the outer peripheral surface of the outer tube 29 of the central tube 21, and a plurality of the second spacers 71 on the upper surface of the annular base portion 72. It consists of a column part 73 in a standing state. In the illustrated example, four support columns 73 are provided at equal intervals. The required number of the second spacers 71 are fitted on the outer periphery of the central tube 21 and stacked from the lower surface 13 in the heat medium accommodating container 11. At this time, the inner flange portion 44 of the plate-like heat storage body 41 is placed on the upper surface of the support column portion 73, and the upper second spacer 71 is placed on the inner flange portion 44 of the plate-like heat storage body 41. The lower surface of the annular base portion 72 is placed, and the inner flange portion 44 of the plate-like heat storage body 41 is sandwiched between the upper and lower second spacers 71 and 71. The staircase shape and height of the first spacer 61 and the height of the column portion 73 of the second spacer 71 are such that the plurality of plate-like heat accumulators 41 are separated from each other by a predetermined interval and are substantially horizontal layers. It is set so that it can be maintained. Further, the heat medium supply outflow holes 35 in the outer tube 29 of the central tube 21 are formed so as to be positioned between the plurality of plate-like heat storage bodies 41 arranged above and below. Further, in the illustrated example, for the uppermost second spacer 710, the support portion 73 is higher than the support portions 73 of the other second spacers 71 so that the uppermost plate-like heat storage body 410 does not rattle. Thus, the heat medium container 11 is in contact with the inside of the upper surface 12.

  As is understood from FIG. 3, the heat storage device 10 configured as described above is supplied with a heat medium from the heat medium supply inlet 33 of the central tube 21 to the heat medium supply flow path 30. The heat medium supplied to the heat medium supply flow path 30 reaches between the plate-shaped heat storage bodies 41 from the heat medium supply outflow holes 35 of the central tube 21, and further while contacting the plate-shaped heat storage bodies 41. It reaches the outer peripheral end of the plate-shaped heat storage body 41. Heat exchange is performed by the heat storage agent 55 in the plate-shaped heat storage body 41 while the heat medium flows while being in contact with the plate-shaped heat storage body 41. When the heat medium reaches the outer peripheral end of the plate-shaped heat storage body 41, the heat medium passes through the heat medium circulation gap S between the outer peripheral end of the plate-shaped heat storage body 41 and the inside of the side surface 14 of the heat medium storage container 11. After reaching the upper part of the heat medium container 11, the heat medium is then discharged from the heat medium discharge inlet 24 of the central tube 21 through the heat medium discharge channel 27 and discharged from the heat medium discharge outlet 26.

The heat storage device 10A of the reference example shown in FIGS. 6 to 8 includes a heat medium storage container 11A that supplies and discharges a heat medium, and a configuration related to the central tube 21A that supplies the heat medium to the heat medium storage container 11A. Unlike the configurations of the heat medium storage container 10 and the central tube 21 in the heat storage device 10 of the first embodiment, other configurations, that is, the plate-shaped heat storage body 41, the first spacer 61, the second spacer 71, and the like, This is the same as the heat storage device 10 of the embodiment. In addition, in the heat storage device 10A of the reference example , the members different from the heat storage device 10 of the first embodiment are given A at the end of the reference numerals, and the members having the same configuration are used in the heat storage device 10 of the first embodiment. The same reference numerals are used for the description. Hereinafter, different configurations will be mainly described.

  The heat medium storage container 11A includes a cylindrical heat medium discharge outlet 17A passing through the inside and outside of the heat medium storage container 11A on an upper surface 12A of a cylindrical container having an upper surface 12A and a lower surface 13A.

  As can be understood from FIGS. 7 to 9, the center tube 21A has a front end 22A closed, the other end 23A opened as a heat medium supply inlet 24A, and the inside constitutes a heat medium supply flow path 25A. A plurality of heat medium supply outflow holes 26A communicating with the heat medium supply flow path 25A are radially formed on the outer peripheral surface at predetermined intervals. The central tube 21A is vertically disposed in the heat medium accommodating container 11A from the center of the lower surface 13A of the heat medium accommodating container 11A, and the closed tip 22A is located in the heat medium accommodating container 11A. The heat medium supply inlet 24A protrudes from the center of the lower surface 13A of the heat medium container 11A to the outside of the heat medium container 11A.

  In the plate-shaped heat storage body 41, the central tube 21 </ b> A is inserted into the center tube insertion hole 43, and a plurality of the plate-shaped heat storage bodies 41 are separated from each other via the first spacer 61 and the second spacer 71. And provided in the heat medium container 11A in a substantially horizontal layer shape. The uppermost one 410 of the plurality of plate-like heat storage bodies 41 is located away from the inside of the upper surface 12A of the heat medium storage container 11A. Further, between the outer peripheral ends of the plurality of plate-like heat storage bodies 41 and the inside of the side surface 14 of the heat medium storage container 11, a heat medium flow gap S is provided, respectively, and the heat medium supply of the central tube 21A is further provided. An outflow hole for operation 26 </ b> A is positioned between the plate-like heat storage bodies 41.

  As can be understood from FIG. 8, in the heat storage device 10A configured as described above, the heat medium is supplied from the heat medium supply inlet 24A of the central tube 21A to the heat medium supply flow path 25A. The heat medium supplied to the heat medium supply channel 25A reaches between the plate-shaped heat accumulators 41 through the heat medium supply outflow hole 26A of the central tube 21A, and further while contacting the plate-shaped heat accumulator 41. It reaches the outer peripheral end of the plate-shaped heat storage body 41. Heat exchange is performed by the heat storage agent 55 in the plate-shaped heat storage body 41 while the heat medium flows while being in contact with the plate-shaped heat storage body 41. When the heat medium reaches the outer peripheral end of the plate-shaped heat storage body 41, the heat medium passes through the heat medium flow gap S between the outer peripheral end of the plate-shaped heat storage body 41 and the inner side surface 14A of the heat medium container 11A. It reaches the upper part of the medium container 11A, and is then discharged from the heat medium discharge outlet 17A on the upper surface 12A of the heat medium container 11A.

As described above, in the heat storage device 10 according to the first embodiment, since the plate-shaped heat storage body 41 is accommodated substantially horizontally in the heat medium storage container 11 , the temperature difference between the upper and lower sides in each plate-shaped heat storage body 41 is changed. It is difficult to occur, and convection hardly occurs in the heat medium in contact with each plate-like heat storage body 41, and the bias of the high temperature region is reduced in the heat medium in the entire heat medium accommodating container 11, and the heat storage device 10 from the high temperature region is removed. Heat dissipation can be suppressed, and heat retention can be improved. Furthermore, since the plate-shaped heat storage body 41 can be flattened, the distance between the central heat storage agent in the plate-shaped heat storage body 41 and the heat medium can be reduced, and quick heat exchange by the heat storage agent 55 can be performed efficiently. In addition, since the heat medium is supplied from the heat medium supply outflow hole 35 of the central tube 21 between a plurality of plate-shaped heat accumulators 41 provided vertically apart, the flow path of the heat medium is short-circuited. The plate-shaped heat storage body of the portion does not come into contact with the heat medium, and the contact between all the plate-shaped heat storage bodies 41 and the heat medium can be secured, and heat exchange can be performed effectively.

It is a perspective view of the heat storage apparatus which concerns on 1st Embodiment in this invention. It is 2-2 sectional drawing of FIG. FIG. 3 is a 3-3 cross-sectional view of FIG. 1. It is a perspective view of the plate-shaped thermal storage body of 1st Embodiment, a center pipe | tube, a 1st spacer, and a 2nd spacer. It is the perspective view and 5-5 sectional drawing of a plate-shaped heat storage body. It is a perspective view of the heat storage apparatus which concerns on a reference example . It is 7-7 sectional drawing of FIG. It is 8-8 sectional drawing of FIG. It is a perspective view of the plate-shaped heat storage body of a reference example, a center tube, a 1st spacer, and a 2nd spacer.

DESCRIPTION OF SYMBOLS 10 Heat storage apparatus 10A Heat storage apparatus 11 Heat medium accommodation container 11A Heat medium accommodation container 12 Upper surface of heat medium accommodation container 12A Upper surface of heat medium accommodation container 13 Lower surface of heat medium accommodation container 13A Lower surface of heat medium accommodation container 14 Heat medium accommodation container Side surface 14A Side surface of the heat medium container 17A Heat medium discharge outlet 21 Central tube 21A Center tube 22 Inner tube 24 Heat medium discharge inlet 24A Heat medium supply inlet 25A Heat medium supply flow path 26 Heat medium discharge flow 26 Outlet 26A Heat medium supply outflow hole 27 Heat medium discharge flow path 29 Outer pipe 30 Heat medium supply flow path 33 Heat medium supply inlet 35 Heat medium supply outflow hole 41 Plate heat accumulator 42 Heat storage agent container 43 Central tube Insertion hole 46 Upper half body 47,51 Outer surface layer 48,52 Intermediate layer 49,53 Inner surface layer 50 Lower half body 55 Thermal storage agent

Claims (3)

A heat medium container (11) to which the heat medium is supplied and discharged;
A concentric inner tube (22) and an outer tube (29) are provided, and the inner tube (22) and the outer tube (29) constitute a heat medium supply channel (30), and the heat medium supply channel The tip (31) of (30) is closed, the other end (32) is opened as a heat medium supply inlet (33), and the tip (23) of the inner pipe (22) is a heat medium discharge inlet (24). ), The other end (25) is opened as a heat medium discharge outlet (26), and the space between the heat medium discharge inlet (24) and the heat medium discharge outlet (26) is a heat medium discharge channel. (27), a central tube having a double-pipe structure in which a plurality of heat medium supply outflow holes (35) communicating with the heat medium supply channel (30) are formed on the outer peripheral surface of the outer tube (29) ( 21) and
A plate-shaped heat storage body (41) in which the heat storage agent (55) is stored in the plate-shaped heat storage agent storage container (42) in which the central tube insertion hole (43) is formed;
And
The central tube (21) is vertically arranged in the heat medium accommodation container (11), and the heat medium discharge inlet (24) is separated from the upper surface (12) of the heat medium accommodation container (11). The heat medium container (11) is located in the heat medium container (11), and the heat medium discharge outlet (26) protrudes from the lower surface (13) of the heat medium container (11) to the outside of the heat medium container (11). ,
The central tube (21) is inserted into the central tube insertion hole (43) in the plate-shaped heat storage body (41), and a plurality of the plate-shaped heat storage bodies (41) are separated from each other vertically and substantially horizontally. The uppermost one (410) of the plurality of plate-like heat storage bodies (41) is separated from the inside of the upper surface (12) of the heat medium container (11). And a heat medium circulation gap (S) is provided between the outer peripheral ends of the plurality of plate-like heat storage bodies (41) and the side surface (14) of the heat medium container (11),
The heat storage device, wherein the heat medium supply outflow hole (35) in the outer tube (29) of the central tube (21) is located between the plate-shaped heat storage bodies (41) . The plate-shaped heat storage agent container (42) includes a plastic outer surface layer (47, 51), an intermediate layer (48, 52) made of metal foil, and a weldable plastic inner layer (49, 53). ) And an upper half (46) and a lower half (50), and a part of the upper half (46) and the lower half (50) are respectively formed on the inner surface layer (49). , 53) . 2. The heat storage device according to claim 1, wherein the heat storage device is welded . The heat storage device according to claim 1 or 2, wherein the heat storage agent (55) has a melting point of 60C to 90C .

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