JP6931821B2 - Heat storage unit - Google Patents

Description

The present invention relates to a heat storage unit, and more particularly to a heat storage unit using a phase change material (PCM).

A heat storage unit using a phase change heat storage material is conventionally known. FIG. 15 is a cross-sectional view of an example of a heat storage unit using a conventional phase change heat storage material (see Non-Patent Documents 1 and 2 below). In the heat storage unit 5, the phase change heat storage material 53 is sealed in a rigid closed container 51 composed of a bottom plate 511 and a lid portion 513, and a heat transfer fin 55 in contact with the phase change heat storage material 53 is attached to the bottom plate. There is.

Thomas O. Leimkuehler and Ryan A. Stephan, “Experimental Investigation of Ice Phase Change Material Heat Exchangers”, 42nd International Conference on Environmental Systems (ICES2012), AIAA-2012-3520, 2012. Michael K. Choi, “Using Paraffin with -10 ℃ to 10 ℃ Melting Point for Payload Thermal Energy Storage in SpaceX Dragon Trunk”, 11th International Energy Conversion Engineering Conference, AIAA 2013-4099, 2013.

However, in a vacuum environment, the closed container 51 needs to withstand the pressure generated from the inside of the container. Further, the volume of the closed container 51 needs to be larger than the volume of the phase change heat storage material 53 in order to cope with the expansion / contraction of the phase change heat storage material 53 due to the phase change. Therefore, a space that is not filled with the phase change heat storage material 53 is created inside the closed container 51. The pressure in the space not filled with the phase change heat storage material 53 is the sum of the vapor pressure of the phase change heat storage material 53 and the residual air pressure. When the phase change heat storage material is filled after vacuum exhaust, the portion of the closed container 51 sandwiched between the space not filled with the phase change heat storage material 53 and the atmosphere outside the closed container 51 is the atmospheric pressure applied from the outside. It is necessary to withstand the differential pressure of the internal pressure, and the weight of the closed container 51 becomes large. Generally, the phase change heat storage material has a very low thermal conductivity, and the heat generating device exceeds the upper limit temperature before the phase change heat storage material is completely melted. Therefore, the heat transfer fin 55 is provided, but the weight of the heat transfer fin 55 is added to the heat transfer fin 55, and the weight of the heat storage unit 5 is further increased. That is, in the conventional heat storage unit, the weight of the closed container and the heat transfer fin occupy more than half of the total weight of the heat storage unit, and the heat storage efficiency (heat storage amount per unit mass) is very poor.

Further, the heat transfer fin 55 is connected to only one surface of the closed container 51, and is not shaped so as to withstand a load. Therefore, for example, it is difficult to directly mount a heavy device on the heat storage unit.

Further, as compared with the shape of the conventional heat storage unit, the shape of the object of heat control of the heat storage unit is various. Therefore, in order to transfer the heat from the object of heat control to the heat storage unit, heat transfer by a mounting joint, a fluid pump, etc. is required, the heat storage efficiency is further reduced, and the contact thermal resistance between each part is significantly reduced. The heat transfer characteristics are deteriorated.

Therefore, one of the objects of the present invention is to improve the heat transfer characteristics of the heat storage unit.

Another object of the present invention is to improve the heat storage efficiency of the heat storage unit.

Another object of the present invention is to improve the structural strength of the heat storage unit.

Another object of the present invention is to increase the degree of freedom in the shape of the heat storage unit so that the heat storage unit can be directly attached to a wide variety of heat control objects.

One aspect of the present invention is a heat storage unit including a closed container provided with a film, a phase change heat storage material enclosed in the closed container, and a heat conductive member in contact with the phase change heat storage material. The closed container is partially provided with a heat conductive material layer, a part of the heat conductive member is thermally conductively bonded to the film, and the heat conductive member is a closed space of the closed container. It provides a heat storage unit that is provided so as to project inward.

The heat conductive member includes a first heat conductive member and a second heat conductive member, and the second heat conductive member is attached to the first heat conductive member in the closed space. Can be placed facing each other.

The first heat conductive member and the second heat conductive member are wavy members, and the valley portion of the first heat conductive member is thermally conductively bonded to the film, and the first one. The heat conductive member and the second heat conductive member are arranged so as to mesh with each other, and the valley portion of the first heat conductive member and the second heat conductive member can be thermally conducted to the film. Can be joined.

One aspect of the present invention includes a first seat member and a second seat member arranged so as to form a closed space between them, and the first seat member is provided around the closed space. A heat storage unit including a closed container in which the second sheet member is sealed to each other, a phase change heat storage material enclosed in the closed container, and a heat conductive member in contact with the phase change heat storage material. The first sheet member and the second sheet member are films containing a heat conductive material layer, and a part of the heat conductive member is thermally conductively bonded to the first sheet member. The heat conductive member provides a heat storage unit provided so as to project inward in the closed space of the closed container.

One aspect of the present invention includes a first seat member and a second seat member arranged so as to form a closed space between them, and the first seat member is provided around the closed space. A heat storage unit including a closed container in which the second sheet member is sealed to each other, a phase change heat storage material enclosed in the closed container, and a heat conductive member in contact with the phase change heat storage material. The first sheet member is a film containing a heat conductive material layer, and the second sheet member has higher rigidity than the first sheet member, includes a heat conductive material portion, and has the heat conductivity. A part of the member is thermally conductively joined to the heat conductive material layer of the first sheet member and / or the heat conductive material portion of the second sheet member, and the heat conductive member is hermetically sealed in the closed container. It provides a heat storage unit that is provided so as to project inward of the space.

The heat conductive member includes a first heat conductive member and a second heat conductive member, and the first heat conductive member and the second heat conductive member are wavy members. A part of the first heat conductive member is thermally conductively bonded to the first sheet member, and a part of the second thermally conductive member is thermally conductively bonded to the second sheet member. Can be done.

The valley portion of the first heat conductive member is thermally conductively joined to the first sheet member, and the valley portion of the second heat conductive member is thermally conductively joined to the second sheet member. The first heat conductive member and the second heat conductive member can be arranged so as to mesh with each other.

An opening may be provided on the slope connecting the peak and the valley of at least one of the first thermally conductive member and the second thermally conductive member.

When the heat storage unit is in a vacuum environment, the heat conductive member can come into contact with the phase change heat storage material.

The phase change heat storage material can be sealed in the closed container in a vacuum state.

The first sheet member can be a wavy member.

One aspect of the present invention includes a closed container, a phase change heat storage material sealed in the closed container, and a plurality of first heat conductive portions in contact with the phase change heat storage material, and an inner wall of the closed container. The portion has thermal conductivity, and one end of the plurality of first heat conductive portions is connected to a first inner wall portion in contact with the heat source of the closed container, and among the plurality of first heat conductive portions. The other end of at least a part of the above provides a heat storage unit connected to a second inner wall portion located at a position where the phase change heat storage material is sandwiched with respect to the first inner wall portion.

It can be assumed that almost all the other ends of the plurality of first heat conductive portions are connected to the inner wall portion of the closed container.

Further including at least one second heat conductive portion, each of the at least one second heat conductive portion has an intersection with at least a part of the plurality of first heat conductive portions, and the intersection. It can be assumed that they are connected by.

It can be assumed that at least one end and / or the other end of at least a part of the at least one second heat conductive portion is connected to the inner wall portion of the closed container.

It can be assumed that almost all one end and / or the other end of the at least one second heat conduction portion is connected to the inner wall portion of the closed container.

At least two of the closed container, the plurality of first heat conductive portions, and the at least one second heat conductive portion can be integrally formed.

At least a part of the plurality of first heat conductive portions and the at least one second heat conductive portion may be columnar or linear heat conductive portions.

The plurality of first heat conductive portions and at least one second heat conductive portion are columnar or linear heat conductive portions, and may form a three-dimensional network structure.

The number density of the at least one second heat conductive portion may be smaller than the number density of the plurality of first heat conductive portions.

One aspect of the present invention includes a closed container, a phase change heat storage material sealed in the closed container, and a three-dimensional network structure, and the inner wall portion of the closed container has thermal conductivity. The three-dimensional network structure is formed by connecting a plurality of linear or columnar heat conductive portions to each other, and a part of the linear heat conductive portions comes into contact with the phase change heat storage material to seal the three-dimensional network structure. Provided is a heat storage unit including a connecting portion connected to an inner wall portion of the container.

According to the present invention having the above configuration, the heat transfer characteristics of the heat storage unit can be improved.

Further, according to the present invention having the above configuration, the heat storage efficiency of the heat storage unit can be improved.

Further, according to the present invention having the above configuration, the structural strength of the heat storage unit can be improved.

Further, according to the present invention having the above configuration, the degree of freedom in the shape of the heat storage unit is increased, and the heat storage unit can be directly attached to a wide variety of heat control targets.

It is a sectional view in the longitudinal direction of the heat storage unit which concerns on 1st Embodiment of this invention. It is a figure which shows the state under the atmospheric pressure environment and the vacuum environment of the heat storage unit which concerns on 1st Embodiment of this invention. Heat storage when the first heat conductive member and the second heat conductive member are not provided, the aluminum thin plate is used as the heating surface, the aluminum thin plate is horizontally arranged, and the film is arranged vertically on the upper side and the vertical side on the lower side, respectively. It is a figure which shows the state of a unit. It is a figure which shows the experimental result about the time-temperature characteristic with respect to a predetermined heat input of the heat storage unit of the structure of FIG. 3A. It is a figure which shows the experimental result about the time-temperature characteristic with respect to a predetermined heat input of the heat storage unit of the structure of FIG. 3 (b). It is a figure which shows the experimental result about the time-temperature characteristic with respect to a predetermined heat input of the heat storage unit which concerns on 1st Embodiment of this invention. It is a longitudinal sectional view of the heat storage unit which concerns on the modification of 1st Embodiment of this invention. It is a longitudinal sectional view of the heat storage unit which concerns on the modification of 1st Embodiment of this invention. It is a perspective view of the heat storage unit which concerns on 2nd Embodiment of this invention. FIG. 7 is a cross-sectional view taken along the line VIII-VIII of FIG. It is a figure explaining one of the effects of the heat storage unit which concerns on 2nd Embodiment of this invention. It is a figure which shows the typical example of the arrangement with respect to the heat source of a heat storage unit, and the arrangement of a phase change heat storage material 3 in an initial state. It is a figure which shows the experimental result about the time-temperature characteristic with respect to a predetermined heat input of the heat storage unit in the arrangement of FIG. 8 which concerns on 2nd Embodiment of this invention. It is a figure which shows the experimental result about the time-temperature characteristic with respect to a predetermined heat input of the heat storage unit in the arrangement of FIG. 10C which concerns on 1st Embodiment of this invention. It is sectional drawing of the heat storage unit which concerns on 3rd Embodiment of this invention. It is a figure which shows the example of the 1st heat conduction part which has a branched structure. It is sectional drawing of the heat storage unit which concerns on 4th Embodiment of this invention. It is sectional drawing of the example of the heat storage unit using the conventional phase change heat storage material.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First Embodiment)
FIG. 1 is a longitudinal sectional view of the heat storage unit according to the first embodiment of the present invention. As shown in FIG. 1, the heat storage unit 1 according to the present embodiment includes a closed container 11, a phase change heat storage material 13, a first heat conductive member 15, and a second heat conductive member 17.

The closed container 11 includes a film 111 which is a first sheet member and an aluminum thin plate 113 which is a second sheet member.

The film 111 is a multilayer film and includes a polypropylene layer which is a heat-sealing layer and an aluminum layer which is a heat conductive material layer. The film 111 is not limited to this, and is not limited to a single-layer film / a multilayer film, and is a film containing any other suitable heat-conducting material layer (for example, a film containing a stainless steel layer as the heat-conducting material layer or a high heat film). A film containing a conductive graphite layer) can be used, or a film not containing a thermally conductive material layer can be used.

The film 111 and the aluminum thin plate 113 are arranged so that a closed space 115 is formed between the film 111 and the aluminum thin plate 113, and are sealed with each other around the closed space 115 to form a closed container 11. The film 111 and the thin aluminum plate 113 are fused by a double-sided heat-sealing film and are sealed to each other. Therefore, the film 111 and the aluminum thin plate 113 are joined so as to be thermally conductive. By making one of the sheet members to be sealed to each other a sheet member having a higher rigidity than a film such as an aluminum thin plate, the deformation due to the expansion / contraction of the phase change heat storage material is concentrated on one surface, and the deformation of the other surface is performed. The contact area with the heat source can be increased by suppressing the above. The second sheet member is not limited to the thin aluminum plate, and any other suitable sheet member having a higher rigidity than the first sheet member, such as a multilayer film having a large metal layer thickness, is used. be able to. Further, as the second sheet member, a film containing the same heat conductive material layer as the first sheet member or a film not containing the heat conductive material layer may be used, or the closed containers 11 are sealed to each other 2 It will be apparent to those skilled in the art that it may be composed of one sheet member instead of one sheet member.

The phase change heat storage material 13 is sealed in the closed container 11 in a vacuum state. When the heat storage unit is not used in a vacuum environment, the phase change heat storage material 13 does not need to be sealed in a vacuum state. Examples of the phase change heat storage material 13 include n-icosane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, and n-. Paraffin such as nonadecane, n-docosane, n-octacosane, mixed wax, water, and an aqueous solution prepared by adding additives to water can be used, but the present invention is not limited to this, and other suitable ones are used. Any material can be used.

By forming the closed container with a flexible material and making the container more flexible than the conventional rigid container, the heat storage efficiency of the heat storage unit can be improved.

That is, as shown in FIG. 2, since the closed container 11 is deformable in an atmospheric pressure environment, the phase change heat storage material 13 sealed in the closed container 11 can self-support. On the other hand, as described above, the phase change heat storage material 13 is sealed in the closed container 11 in a vacuum state, but when the heat storage unit 1 is in a vacuum environment, the residual air and the steam of the phase change heat storage material 13 cause the phase change heat storage material 13. The closed container 11 expands, and pressure from the gas layer formed from the residual air and the vapor of the phase change heat storage material 13 is generated from the inside of the closed container 11. However, in the conventional rigid container, a bending force is applied to the closed container, whereas in the flexible container of the present embodiment, a tensile force is applied to the flexible member, but the flexible member has a tensile force. Because it is strong against, it can be supported. Here, the pressure itself due to the gas layer is such that the pressure of the residual air at the time of filling the phase change heat storage material 13 is about several Pa when an oil rotary pump is used for evacuation, and the vapor pressure of the phase change heat storage material 13 is also. For example, octadecane is very small, about several Pa at room temperature, which is 1/10000 of the atmospheric pressure that a conventional rigid container should withstand. Therefore, since the closed container 11 can be made of a flexible member, the weight can be significantly reduced as compared with the closed container of the conventional heat storage unit.

The first heat conductive member 15 and the second heat conductive member 17 are resin-reinforced graphite sheets and have a wavy shape. As the resin-reinforced graphite sheet, a laminate in which a graphite layer is formed can be used as a support layer for the polyethylene terephthalate layer. The valley portion 151 of the first heat conductive member 15 is fused to the film 111 by a double-sided heat-sealing film and is bonded so as to be heat conductive. Further, the valley portion 171 of the second heat conductive member 17 is fused to the aluminum thin plate 113 by a double-sided heat fusion film, and is bonded so as to be heat conductive. The first heat conductive member 15 and the second heat conductive member 17 are not limited to the resin reinforced graphite sheet, and may be made of any other suitable material. For example, it can be a multilayer film including a polypropylene layer and a heat conductive layer. In this case, the film 111 and the aluminum thin plate 113 can be fused only by the polypropylene layer owned by the film without using the double-sided heat fusion film. It can be heat-sealed. The first heat conductive member 15 and the second heat conductive member 17 are arranged so as to mesh with each other. On the slopes of the first heat conductive member 15 and the second heat conductive member 17 connecting the peaks and valleys, an arbitrary number, in order to facilitate the flow of the melted phase change heat storage material 13, Each may be provided with a shaped opening.

In the present embodiment, the shapes of the first heat conductive member 15 and the second heat conductive member 17 have a "<" shape in cross section, but other suitable cross sections such as trapezoidal and rectangular. It can have a wavy shape. Further, the number of the heat conductive members may be at least one, and the shape thereof is not limited to a wavy shape, and any other suitable shape can be used. Furthermore, when the heat storage unit is not used in a vacuum environment, it is unlikely that the container will expand significantly and the distance between the film 111 and the aluminum thin plate 113 will increase. If it is provided so as to project inward of the closed space of the closed container, the contact with the phase change heat storage material is maintained, and thus it may be configured as such.

The first heat conductive member 15 and the second heat conductive member 17 are made to come into contact with the phase change heat storage material 13 even when the heat storage unit 1 is in a vacuum environment. This is due to the following reasons.

As described above, when the heat storage unit 1 is in a vacuum environment, the closed container 11 expands due to the residual gas and the steam of the phase change heat storage material 13, and the gas formed from the residual gas and the steam of the phase change heat storage material 13. A layer is formed, but since heat conduction is hindered by this gas layer, the heat transfer characteristics of the heat storage unit 1 are deteriorated.

That is, when the first heat conductive member 15 and the second heat conductive member 17 are not present, for example, as shown in FIGS. 3A and 3B, the aluminum thin plate 113 is used as a heating surface and the aluminum thin plate is used as a heating surface. Consider a case where the 113 is arranged horizontally and the film 111 is arranged on the upper side in the vertical direction and the lower side in the vertical direction, respectively. In FIG. 3A in which the film 111 is arranged on the upper side in the vertical direction, the phase change heat storage material 13 comes into contact with the entire surface of the aluminum thin plate 113, so that heat is efficiently transferred to the phase change heat storage material 13 and by natural convection. Heat transfer is promoted. On the other hand, in FIG. 3B in which the film 111 is arranged on the lower side in the vertical direction, the area of the phase change heat storage material 13 in contact with the aluminum thin plate 113 is reduced, and the area in contact with the gas layer is large. It is difficult for heat to be transferred to the phase change heat storage material 13. Further, since the solid phase portion of the phase change heat storage material 13 is settled by gravity, heat transfer by convection is not performed.

Therefore, in the present embodiment, the first heat conductive member 15 and the second heat conductive member 17 come into contact with the phase change heat storage material 13 even when the heat storage unit 1 is in a vacuum environment. By doing so, it is possible to easily transfer heat to the phase change heat storage material 13 regardless of the orientation of the arrangement of the heat storage unit 1.

4 (a) to 4 (c) show the results of a comparative experiment between the heat storage unit having the configuration of FIGS. 3 (a) and 3 (b) and the heat storage unit according to the present embodiment with respect to the time-temperature characteristics with respect to a predetermined heat input. It is a figure.

In each experiment, an aluminum plate to which a heater was attached was used as the heat source 2. Then, the heat storage unit 1 is attached to the surface of the aluminum plate opposite to the surface to which the heater is attached, and the temperature of the aluminum plate considered to be substantially equal to the temperature of the portion of the phase change heat storage material 13 in contact with the aluminum thin plate 113. The temperature of the central portion of the film 111, which is considered to be substantially equal to the temperature of the portion of the phase change heat storage material 13 which is considered to have the lowest temperature, was measured. Octadecane was used as the phase change heat storage material 13, and the amount of heat input was about 10 W as shown in each figure.

Since the temperature at the center of the film is considered to be the lowest temperature of the phase change heat storage material 13 as described above, the inflection point in each graph of the temperature at the center of the film indicates that the phase change heat storage material 13 is completely melted. It is considered to be a point to show. From FIG. 4 (b) corresponding to the configuration of FIG. 3 (b), in the configuration of FIG. 3 (b), the temperature of the aluminum plate rises before the phase change heat storage material 13 is completely melted. You can see that there is.

On the other hand, according to the present embodiment having the first heat conductive member 15 and the second heat conductive member 17, the temperature of the aluminum plate corresponds to the configuration of FIG. 3 (a). It shows the same change as a), and it can be seen that heat conduction is performed efficiently. Further, the temperature difference ΔT between the melting points of the aluminum plate and the octadecane at the inflection point corresponding to the complete melting of the phase change heat storage material 13 is about 40 as compared with FIG. 4 (b) corresponding to the configuration of FIG. 3 (b). It was suppressed from ° C to about 13 ° C.

Next, a method of manufacturing the heat storage unit according to the present embodiment will be described.

First, the two resin-reinforced graphite sheets are bent in a wavy shape.

Subsequently, a double-sided heat-sealing film is sandwiched between a rectangular resin-reinforced graphite sheet bent in a wavy shape and a rectangular multilayer film containing a polypropylene layer and an aluminum layer, which is press-molded in a convex shape in advance, and locally heat-fused. Heat / press with a wearing device to fuse. The resin-reinforced graphite sheet and the aluminum thin plate, which are bent in a wavy shape, are also fused in the same manner. The method of joining the resin-reinforced graphite sheet and the multilayer film is not limited to fusion, and any other suitable method can be used as long as it is a heat-conducting bond such as by a very thin adhesive layer. Can be used. Further, when a multilayer film containing a polypropylene layer and a heat conductive layer is used instead of the resin-reinforced graphite sheet, it is possible to heat-fuse only the polypropylene layer of its own without using a double-sided heat-sealing film. ..

A vacuum exhaust tube can be attached to the multilayer film for internal vacuum exhaust and adhered to prevent leakage.

Next, the multilayer film and the aluminum thin plate are overlapped and aligned, leaving one side for filling the phase change heat storage material 13, and heat-sealing the three sides with an impulse heat fusion device to create a bag body. ..

The phase change heat storage material 13 melted in advance is poured into the bag body from one side that has not been fused, cooled by a refrigerating device to solidify the phase change heat storage material 13, and the bag body is taken out from the refrigerating device.

After that, the bag body is set in the vacuum heat fusion apparatus that performs heat fusion in a vacuum environment, and one side of the unfused side is heat-sealed.

Instead of using the vacuum heat fusion device, the following may be used. That is, before the phase change heat storage material 13 inside the bag body is melted, the inside of the bag body is evacuated using a vacuum exhaust tube to reach the required degree of vacuum (preferably less than the vapor pressure of the phase change heat storage material). Then, while continuing the evacuation, the closed container 11 is formed by heat-sealing between the phase change heat storage material filling portion and the vacuum exhaust tube mounting portion with an impulse heat fusion device, and the evacuation is stopped. After that, the entire side of the closed container 11 is resealed with a hot plate type heat fusion device capable of controlling the temperature, pressure, and time. According to such a method, the phase change heat storage material 13 can be sealed in the closed container 11 with a higher degree of vacuum.

In the above embodiment, the force due to the volume change due to melting / solidification of the phase change heat storage material 13 is applied to the first heat conductive member 15 and the second heat conductive member 17. Therefore, in order to prevent the first heat conductive member 15 and the second heat conductive member 17 from being destroyed by the force due to the volume change due to the melting / solidification of the phase change heat storage material 13, the third heat conductive member is used. It may be arranged between the film 111 and the first heat conductive member 15.

For example, as shown in FIG. 5, both sides of an aluminum thin plate 117 having a long distance between the irregularities of the first heat conductive member in the direction of being the shortest and both ends in the longitudinal direction being bent in a U shape. It may be bonded to the film 111 by the heat-sealing film, and the valley portion of the first heat conductive member 15 may be bonded to the aluminum thin plate 117 by the double-sided heat-sealing film. With such a configuration, while maintaining flexibility in the direction in which the distance between the irregularities of the first heat conductive member is the shortest, in the direction orthogonal to the direction in which the distance between the irregularities of the first heat conductive member is the shortest. On the other hand, it can be made difficult to bend. The bent shape of both ends of the third heat conductive member in the longitudinal direction is not limited to a U shape, and maintains flexibility in the direction in which the distance between the irregularities of the first heat conductive member is the shortest. On the other hand, any other suitable shape can be used as long as it is difficult to bend in the direction orthogonal to the direction in which the distance between the irregularities of the first heat conductive member is the shortest.

Further, as shown in FIG. 6, the distance between the irregularities of the first heat conductive member is long in the direction of being the shortest, and the depth between the peak and the valley is the depth of the first heat conductive member 15. A wavy aluminum thin plate 119 shallower than the depth between the peaks and valleys is bonded to the film 111 by a double-sided heat-sealing film, and the valleys of the first heat conductive member 15 are bonded to the double-sided heat-sealing film. May be joined to the thin aluminum plate 119. With such a configuration, while maintaining flexibility in the direction in which the distance between the irregularities of the first heat conductive member is the shortest, in the direction orthogonal to the direction in which the distance between the irregularities of the first heat conductive member is the shortest. On the other hand, it can be made difficult to bend. Instead of such a configuration, the film 111 itself has a wavy shape shallower than the depth between the peaks and valleys of the first heat conductive member 15, and the first heat conductivity is formed in the valleys of the film 111. The valley portion of the member 15 may be joined.

Further, instead of arranging the third heat conductive member between the film 111 and the first heat conductive member 15, the film 111 itself is wavy without using the first heat conductive member 15. It may be in the shape of. With such a configuration, the amount of the phase change heat storage material 13 that can be accommodated in the closed container 11 is reduced, but the first is flexible in the direction in which the interval between the irregularities of the first heat conductive member is the shortest. It is possible to make it difficult to bend in the direction orthogonal to the direction in which the distance between the irregularities of the heat conductive member is the shortest.

(Second Embodiment)
FIG. 7 is a perspective view of the heat storage unit according to the second embodiment of the present invention. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. Here, in this perspective view, the side wall of the storage unit and the phase change heat storage material are excluded in order to make it easier to see the inside of the heat storage unit. The configuration and operating principle of the second embodiment of the present invention will be described with reference to FIGS. 7 and 8. The description overlapping with the first embodiment will be omitted.

The heat storage unit 3 according to the present embodiment includes a closed container 31, a phase change heat storage material 33, and a three-dimensional network structure 35.

The closed container 31 has a rectangular parallelepiped shape and is made of a material having thermal conductivity. The shape of the closed container 31 is not limited to a rectangular parallelepiped, and can be any shape. Further, as the material having thermal conductivity constituting the closed container 31, for example, aluminum, copper, an alloy of aluminum or copper can be used, but the material is not limited to this, and any other suitable material can be used. Materials can be used. The phase change heat storage material 33 is sealed in the closed container 31 in a vacuum state. The phase change heat storage material 33 may be sealed in an atmospheric pressure state. Examples of the phase change heat storage material 33 include n-icosane, n-undecane, n-dodecane, n-tridecane, n-tetradecane, n-pentadecane, n-hexadecane, n-heptadecane, n-octadecane, and n-nonadecane. Paraffin such as n-docosane and n-octacosane, mixed wax, erythritol, pentadecane, high-density polyethylene, lithium nitrate water, and an aqueous solution prepared by adding additives to water can be used, but the limitation is limited to this. Any other suitable material can be used, not the one that is used.

A hollow cylindrical port 357 for filling the closed container 31 with the vacuum exhaust or the phase change heat storage material 33 is provided on one surface of the closed container 31, after the vacuum exhaust or the phase change heat storage material 33 is filled. , Is sealed.

The three-dimensional network structure 35 is formed by connecting a plurality of linear first heat conductive portions 351a and second heat conductive portions 351b having a circular cross section to each other. Specifically, the linear first heat conductive portions 351a and the second heat conductive portions arranged at predetermined intervals in three directions perpendicular to each other are connected to each other at their intersections 353, and are a three-dimensional network. The structure 35 is formed. The directions of the linear heat conductive portions 351a and the second heat conductive portion are not limited to the three directions perpendicular to each other, and any other suitable one as long as it forms a three-dimensional network structure. The distance between the linear heat conductive portion 351a and the second heat conductive portion is not limited to a fixed distance, but may vary. Further, the cross-sectional shape of the linear heat conductive portion 351 is not limited to a circle, but may be any other suitable shape such as a rectangle, a polygon, and a star. Further, the thicknesses (cross-sectional dimensions) of the linear heat conductive portions 351a and 351b are not limited to a constant thickness, but may vary. The plurality of first heat conductive portions 351a'-1 and 351a'-2 can have any suitable shape such as linear, columnar, and plate-like. Further, the plurality of first heat conductive portions 351a'-1 and 351a'-2 are a combination of heat conductive portions having different shapes (for example, a linear heat conductive portion having a different thickness and a plate shape having a different thickness). It may be composed of a combination of heat conductive portions).

A part of the linear first heat conductive portion 351a and the second heat conductive portion 351b is in contact with the phase change heat storage material 33. The linear first heat conductive portion 351a and the second heat conductive portion 351b include a connecting portion 355 connected to the inner wall portion 311 of the closed container 31 except for the portion corresponding to the opening of the port 357. There is. Specifically, the linear first heat conductive portion 351a is provided on the first wall, one end of which is in contact with the heat source 4 of the closed container 31, except for the portion corresponding to the opening of the port 357. The inner wall portion 311 which is connected to the first inner wall portion 311a which is the corresponding inner wall portion 311 and whose other end corresponds to the second wall which faces the first inner wall portion 311a with the phase change heat storage material 33 interposed therebetween. It is connected to the second inner wall portion 311b. Further, both ends of the linear second heat conductive portion 351b are connected to the third inner wall portion 311c and the fourth inner wall portion 311d corresponding to the side walls 31c and 31d of the closed container 31. Here, a part of the plurality of linear first heat conductive portions 351a is connected to one end of the first inner wall portion 311a and the other end is not connected to the second inner wall portion 311b. May be. In this case, the number and the ratio of those whose other ends are connected to the second inner wall portion 311b and those whose other ends are not connected can be arbitrarily determined. Further, one end and / or both ends of the linear second heat conductive portion 351b may not be connected to the third inner wall portion 311c and / or the fourth inner wall portion 311d. As the material having thermal conductivity constituting the linear first thermal conductive portion 351a and the second thermal conductive portion 351b, for example, aluminum, copper, an alloy of aluminum or copper can be used. Any other suitable material can be used, not limited to.

The closed container 31, the three-dimensional network structure 35, and the port 357 are integrally formed, and this integrated configuration can be manufactured using a 3D printer. Since the heat storage unit according to the present embodiment can be manufactured by using a 3D printer, it is possible to individually manufacture the heat storage unit in the shape of a closed container according to the space in which the heat storage unit can be arranged. In this way, since the closed container is integrally formed with the three-dimensional network structure, the closed container and the heat transfer are different from the case where the heat transfer portion of another part is attached to the closed container as in the conventional case. It is possible to avoid deterioration of heat transfer characteristics due to contact heat resistance between the parts, and it is possible to transfer heat to the heat storage unit with high efficiency.

In the present embodiment, the linear first heat conductive portion 351a and the second heat conductive portion 351b are connected to the inner wall 311 of the airtight container 31 having heat conductivity, and are predetermined in three directions perpendicular to each other. Since the linear first heat conductive portions 351a and the second heat conductive portions 351b arranged at intervals are connected to each other, only from the wall surface of the first wall in contact with the heat source 4 of the closed container 31. Instead, heat flows in from above and from the side surface through the side walls 31c and 31d and the side walls 31c and 31d of the closed container and the second wall facing the first wall, and heat is transferred to the entire phase change heat storage material 33. It becomes possible. Further, as shown in FIGS. 9 and 15, in the conventional heat storage unit, since the container and the heat transfer fin are not structurally connected, when the heat storage unit is in a vacuum environment, the pressure of the gas layer is increased. On the other hand, it is necessary to support only the ridge of the container, and when the heat storage unit is under atmospheric pressure or when other load is applied to the heat storage unit, the ridge of the container is exposed to the atmospheric pressure or load. Although it was necessary to support only the portion, according to the present embodiment, the linear first heat conductive portion 351a and the second heat conductive portion 351b have a connecting portion 355 for connecting with the closed container 31. The connecting portion 355 serves as a support point, and the support point increases. Further, from the viewpoint of buckling, the lengths of the columns of the linear first heat conductive portion 351a and the second heat conductive portion 351b are linear, and the lengths of the linear first heat conductive portion 351a and the second heat conductive portion 351a are different. Since it is reduced to the interval between each intersection 355 of the portion 351b, buckling is less likely to occur. Therefore, the pressure resistance and the load capacity are improved, and the weight of the container can be reduced. Further, since the heat transfer fins of the conventional heat storage unit have a plate-like shape, the volume occupied by the heat transfer fins is large with respect to the internal volume of the closed container, and the filling rate of the phase change heat storage material is small. Since the heat storage unit according to the embodiment uses a three-dimensional network structure formed by connecting linear heat conductive portions to each other as a heat transfer member, it is possible to increase the filling rate of the phase change heat storage material. became. As described above, the heat storage unit according to the present embodiment greatly improves the heat transfer characteristics, heat storage efficiency, pressure resistance, and load bearing capacity of the heat storage unit.

In the present embodiment, the dominant flow of heat flow is from the first wall in contact with the heat source 4 of the closed container 31, the side walls 31c, 31d, the side walls 31c, 31d, and the second wall facing the first wall. This is a flow that flows directly to the phase change heat storage material 33 via the linear first heat conductive portion 351a without passing through. On the other hand, it is connected to the side walls 31c and 31d of the closed container 31, which are linear heat conductive portions in a direction different from the direction of the linear heat conductive portion 351a connected to the first wall of the closed container 31. The linear second heat conductive portion 351b also plays a role of increasing the strength of the closed container 31. Therefore, in order to increase the filling rate of the phase change heat storage material within the range where the required strength is guaranteed, the direction of the linear first heat conductive portion 351a connected to the first wall of the closed container 31. The number density of the linear second heat conductive portion 351b in a direction different from the above is made smaller than the number density of the linear first heat conductive portion 351a connected to the first wall of the closed container 31. You may. In the present embodiment, the pitch of the linear second heat conductive portion 351b in the direction orthogonal to the direction of the linear first heat conductive portion 351a connected to the first wall of the closed container 31 is set. The pitch is made larger than the pitch of the linear first heat conductive portion 351a connected to the first wall of the closed container 31.

In this way, the number density of the heat conductive portions to be connected can be varied for each portion of the inner wall portion of the closed container according to the heat flow, the desired pressure resistance, the load bearing capacity, and the like. Further, it is connected in order to change the cross-sectional area of the heat conductive portion to be connected or to increase the contact area with the phase change heat storage material according to the heat flow, the desired pressure resistance, the load bearing capacity, and the like. The cross-sectional shape of the heat conductive portion may be changed. Further, the same configuration may be applied to a portion where the phase change heat storage material is expected to be difficult to melt.

Arrangement of the heat storage unit 3 with respect to the heat source 4 and phase change in the initial state As shown in FIG. 8, the heat storage unit 3 is arranged on the upper side in the vertical direction with respect to the heat source 4, and the phase change in the initial state. In addition to the case where the heat storage material 33 is arranged in contact with the first wall, the heat storage unit 3 is arranged vertically upward with respect to the heat source 4 as shown in FIGS. 10A to 10C. When the phase change heat storage material 33 is arranged in contact with the second wall in the initial state, the heat storage unit 3 is arranged vertically downward with respect to the heat source 4, and the phase change heat storage material 33 is the first in the initial state. When arranged in contact with the wall, it is typical that the heat storage unit 3 is arranged vertically downward with respect to the heat source 4, and the phase change heat storage material 33 is arranged in contact with the second wall in the initial state. It can be considered as a case.

Of these, as described in the first embodiment, in the arrangement of FIGS. 10A and 10C, since the gas layer exists on the heat source 4 side, it becomes difficult for heat to be transferred to the phase change heat storage material 33. ing. Further, in the arrangements shown in FIGS. 10B and 10C, since the solid phase portion of the phase change heat storage material 13 is settled by gravity, heat transfer by convection is not performed. Therefore, it is considered that the arrangement shown in FIG. 10C has the worst heat transfer characteristics and heat storage efficiency.

11a and 11b show the experimental results of the heat storage unit in the arrangement of FIG. 8 and the arrangement of FIG. 10C, which is considered to have the worst heat transfer characteristics and heat storage efficiency, with respect to the time-temperature characteristics with respect to a predetermined heat input. It is a figure.

In each experiment, an aluminum plate to which a heater was attached was used as the heat source 4. Then, the heat storage unit 3 is attached to the surface of the aluminum plate opposite to the surface on which the heater is attached, and the temperature of the portion of the phase change heat storage material 33 facing the first wall is considered to be substantially equal to that of the aluminum plate. The temperature of the central portion of the second wall, which is considered to be substantially equal to the temperature of the portion of the phase change heat storage material 33 which is considered to have the lowest temperature, was measured. Octadecane was used as the phase change heat storage material 33, and the input heat amount was 0.3 W / cm ² .

Since the temperature at the center of the second wall is considered to be the lowest temperature of the phase change heat storage material 33, the inflection in each graph of the temperature at the center of the second wall is similar to that described in the first embodiment. It is considered that the point indicates that the phase change heat storage material 33 is completely melted. In both the arrangement of FIG. 8 and the arrangement of FIG. 10 (c) of the present embodiment, the temperature of the aluminum plate shows the same change as that of FIG. 4 (a) of the first embodiment, and the heat conduction is efficient. You can see that it is being done. Further, the temperature difference ΔT between the melting points of the aluminum plate and octadecane at the inflection point corresponding to the complete melting of the phase change heat storage material 33 is 11.5 ° in the arrangement shown in FIG. 8 and 11.3 in the arrangement shown in FIG. 10 (c). ° Was suppressed to a small value as in the first embodiment.

Regarding the arrangement of FIGS. 10 (a) and 10 (b), the same experimental results as those of FIGS. 8 and 10 (c) were obtained, and the three-dimensional network structure was obtained regardless of the arrangement of the heat storage unit 3 and the phase change heat storage material 33. It can be seen that the body 35 greatly improves the heat transfer characteristics and the heat storage efficiency.

Next, the design method of the heat storage unit of this embodiment will be described.

(1) First, (i) the usable footprint area and shape of the closed container, and the maximum allowable height, (ii) the amount of heat or heat flux (input heat amount or input heat flow velocity) input from the heat source to the heat storage unit, (Iii) The duration of heat generation of the heat source (heat generation duration), (iv) and various other restrictions (weight, etc.) are specified.

(2) Subsequently, the height of the closed container is calculated. First, the mass of the phase change heat storage material to be filled in the closed container is the mass of the phase change heat storage material [kg] = input heat amount [W] x heat generation duration [sec] / latent heat of melting of the phase change heat storage material [J / kg]. ] To calculate. Next, the minimum required internal volume of the closed container is the minimum required internal volume of the closed container [m ³ ] = mass of the phase change heat storage material to be filled [kg] / density of the phase change heat storage material [kg / m]. ³ ] to calculate. Here, as the density of the phase change heat storage material, the minimum value of the density including the solid state and the liquid state is used. Then, the height of the closed container is calculated from the height of the closed container [m] = the minimum required internal volume of the closed container [m ³ ] / footprint area [m ^2].

(3) Setting the diameter and pitch of the linear heat conductive portion In this embodiment, not only from the first wall in contact with the heat source of the closed container, but also the side wall, side wall and second wall of the closed container. Heat also flows in from the wall surface and the side surface direction of the second wall, but the contribution becomes smaller as the size of the footprint increases. Therefore, when the size of the footprint is large, the inflow of heat from the wall surface or the side surface direction of the second wall of the closed container becomes very small at the central portion of the closed container, which is located far from the wall surface of the closed container. ..

Therefore, as a case where the heat inflow is the smallest, consider the case where there is no heat inflow from the wall surface and the side surface direction of the second wall of the closed container, and consider the case where the first wall and the second wall of the closed container and them are used. Simple heat that models only one linear heat conductive part fin to be connected, and one linear heat conductive part and surrounding phase change heat storage material (region that one linear heat conductive part is in charge of) Perform analysis and evaluate the maximum temperature difference ΔT between the hottest part of the phase change heat storage material (the part in contact with the heated lower wall) and the coldest part (the part farthest from the linear heat conductive part). do. Here, ΔT becomes the highest temperature of the phase change heat storage material at the moment when the temperature of the lowest temperature portion of the phase change heat storage material rises sharply from the vicinity of the melting point (position of the turning point) in the temperature change characteristic with respect to the heating time. The temperature difference between the part and the part with the lowest temperature. Since ΔT is determined by the target thermal control requirement, the diameter and pitch of the linear heat conductive portion are adjusted until it becomes equal to or less than the allowable value.

When the diameter and pitch of the linear heat conductive portion are determined, the filling rate (volume ratio or weight ratio) of the phase change heat storage material is determined.

In step (1), the external dimensions of the closed container are determined by ignoring the linear heat conductive part, and the amount of phase change heat storage material that can be filled in the closed container by the amount of the increase in the linear heat conductive part. If necessary, the steps (1) and (2) are repeated to determine the diameter and the pitch of the linear heat conductive portion.

Since the heat transfer through the side wall, the side wall and the second wall is ignored when the design is performed in such a procedure, the actually manufactured closed container is passed through the side wall, the side wall and the second wall. It is expected that the heat transfer performance will be better than expected (ΔT will be smaller) by the amount of the heat transfer effect.

In the present embodiment, the linear heat conductive portion includes a connecting portion connected to the inner wall portion of the closed container except for the portion corresponding to the cross section of the port, but is one of the linear heat conductive portions. If the portion includes a connecting portion that is connected to the inner wall portion of the closed container, heat from the heat source is transferred and the number of support points is increased, so that the portion can be configured as such.

(Third Embodiment)
FIG. 12 is a schematic cross-sectional view of the heat storage unit according to the third embodiment of the present invention. The configuration and operating principle of the third embodiment of the present invention will be described with reference to FIG. Descriptions that overlap with the first and second embodiments will be omitted.

The heat storage unit 3 according to the present embodiment is adapted to a cylindrical heat source.

The heat storage unit 3'according to the present embodiment includes two closed containers 31'-1, 31'-2, phase change heat storage materials 33'-1, 33'-2, and a plurality of first heat conductive portions 351a'-. Includes 1,351a'-2.

The two closed containers 31'-1 and 31'-2 have a semi-cylindrical first wall 31a'-1, 31a'-2 and a first wall 31a'-, respectively, which are in contact with the cylindrical heat source 4'. Semi-cylindrical second walls 31b'-1, 31b'-2 and first wall 31a facing the phase change heat storage materials 33'-1 and 33'-2 with respect to 2, 31a'-2. The first wall 31a'-1, 31a'-2 and the second wall 31a'-1, 31a'-2 so that a closed space is formed between the'-1 and 31a'-2 and the second wall 31b'-1 and 31b'-2. A rectangular plate-shaped third wall 31c'-1, 31c'-2 connected to the outer edge of the walls 31b'-1 and 31b'-2 is provided. The two closed containers 31'-1 and 31'-2 are bolted so that the third walls 31c'-1 and 31c'-2 are in contact with each other.

The insides of the two closed containers 31'-1 and 31'-2 are filled with the phase change heat storage materials 33'-1 and 33'-2.

The plurality of first heat conductive portions 351a'-1 and 351a'-2 are provided radially in the radial direction, and one end thereof is connected to the inner wall portions of the first walls 31a'-1 and 31a'-2. The other end is connected to the inner wall portions 31b'-1 and 31b'-2 of the second wall and is in contact with the phase change heat storage materials 33'-1 and 33'-2.

The closed containers 31'-1, 31'-2, and the plurality of first heat conductive portions 351a'-1 and 351a'-2 are integrally formed, and this integrated configuration uses a 3D printer. Can be manufactured.

In addition to the above configuration, as shown by the broken line in FIG. 12, a plurality of second heat conductive portions 351b'-1, 351b connected to the plurality of first heat conductive portions 351a'-1 and 351a'-2. '-2 may be provided in a form of bridging between a plurality of first heat conductive parts, heat conductive parts 351a'-1 and 351a'-2. The second heat conductive portions 351b'-1 and 351b'-2 may be singular.

In the above embodiment, the distance between the plurality of first heat conductive portions 351a'-1 and 351a'-2 increases as they approach the second wall 31b'-1 and 31b'-2, and phase change heat storage. It becomes difficult to transfer heat to the material. Therefore, as shown in FIG. 13, if the structure of the plurality of first heat conductive portions 351a'-1 is a branched structure, the heat conductive portions can also be located on the second walls 31b'-1 and 31b'-2. The distance between the branches becomes smaller, and heat can be easily transferred to the phase change heat storage materials 33'-1 and 33'-2. At this time, the thickness of each branch of the heat conductive portion is thicker as it is closer to the first walls 31a'-1 and 31a'-2, and thinner as it is closer to the second walls 31b'-1 and 31b'-2. Then, heat can be efficiently transferred to the phase change heat storage material.

With such a configuration, the heat storage unit can be directly attached according to the shape of the heat source, and the heat from the heat source can be efficiently transferred to the heat storage unit.

(Fourth Embodiment)
FIG. 14 is a schematic cross-sectional view of the heat storage unit according to the fourth embodiment of the present invention. With reference to FIG. 14, the configuration and operating principle of the fourth embodiment of the present invention will be described. The description overlapping with the first to third embodiments will be omitted.

The heat storage unit according to the present embodiment is adapted to a pipe through which a hot fluid flows.

The heat storage unit 3 ″ according to the present embodiment has a cylindrical shape in which both ends are connected to the pipe 31 ″ a so that a closed space is formed between the pipe 31 ″ a and the pipe 31 ″ a. It includes an outer shell 31 ″ b, a phase change heat storage material 33 ″, and a plurality of first heat conductive portions 351a ″.

In the present embodiment, the pipe 31 ″ a, the outer shell 31 ″ b, and the plurality of first heat conductive portions 351a ″ are integrally formed, and the pipe 31 ″ a and the outer shell 31 ″ are integrally formed. A closed container is constructed by b.

The inside of the closed container composed of the pipe 31 ″ a and the outer shell 31 ″ b is filled with the phase change heat storage material 33 ″.

The plurality of first heat conductive portions 351a'' are provided radially in the radial direction, one end thereof is connected to the inner wall portion of the first wall, and the other end is connected to the inner wall portion of the second wall. It is in contact with the change heat storage material 33''.

According to this embodiment, since the pipe is integrally formed with the heat storage unit, heat transfer due to the contact heat resistance between the pipe and the heat storage unit is compared with the case where the heat storage unit is attached to the pipe. Deterioration of characteristics can be avoided, and highly efficient heat transfer to the heat storage unit becomes possible.

As described above, since the heat storage unit according to the present embodiment can be manufactured by using a 3D printer, it is possible to individually manufacture the heat storage unit in the shape of a closed container according to the space in which it can be arranged. Further, as described above, since the heat storage unit according to the present embodiment has load bearing capacity, it is possible to mount the device directly on the heat storage unit. Therefore, when arranging the storage unit in a space where the storage unit can be placed, even if it is necessary to mount the equipment on the storage unit, it is not necessary to separately provide a stand on which the equipment is placed, and the equipment is directly placed on the heat storage unit. Equipment can be installed.

In addition to the configuration of the above embodiment, a graphite sheet may be attached to the outer surface of the closed container. According to such a configuration, the heat from the heat source can be transferred to the side wall or the second wall far from the heat source through the graphite sheet, so that the heat is transferred to the phase change heat storage material from all directions of the closed container. be able to. Therefore, it is particularly advantageous when the distance from the heat source to the second wall is large. Since the graphite sheet has a thermal conductivity per unit mass that is nearly 10 times that of aluminum, for example, the weight of the heat storage unit can be reduced.

Although the present invention has been described above with respect to some embodiments for illustration purposes, the present invention is not limited thereto, and the forms and details will be described without departing from the scope and spirit of the present invention. It will be apparent to those skilled in the art that various modifications and modifications can be made.

1 Heat storage unit 11 Sealed container 111 Film 113 Aluminum thin plate 115 Sealed space 117 Aluminum thin plate 119 Aluminum thin plate 13 Phase change heat storage material 15 First heat conductive member 151 Tanibe 153 Mountain part 17 Second heat conductive member 171 Tanibe 173 Yamabe 2 Heat source 3 Heat storage unit 31, 31'-1, 31'-2 Sealed container 31a, 31a'-1, 31a'-2 First wall 31b, 31b'-1, 31b'-2 Second Wall 31c, 31d Side wall 31c'-1, 31c'-2 Third wall 31''a Piping 31''b Outer shell 311 Inner wall part 311a First inner wall part 311b Second inner wall part 311c Third inner wall part 311d Fourth inner wall portion 33, 33'-1, 33'-2, 33 "" Phase change heat storage material 35 Three-dimensional network structure 351a, 351a'-1, 351a'-2, 351a "" First Heat transfer part 351b, 351b'-1, 351b'-2, 351b'' Second heat transfer part 353 Intersection 355 Connection part 357 Port 4, 4'Heat source 5 Heat storage unit 51 Sealed container 511 Bottom plate 513 Lid 53 phase Change heat storage material 55 Heat transfer fin 6 Heat source

Claims (16)

A closed container having a first wall of thermal conductivity in contact with the heat source and a second wall of non-contact with the heat source.
The phase change heat storage material enclosed in the closed container and
A first that has one end connected to the first inner wall portion corresponding to the first wall and the other end connected to the second inner wall portion corresponding to the second wall and is in contact with the phase change heat storage material. Heat conduction part and
Have,
It has a plurality of the first heat conductive portions, and has a plurality of the first heat conductive portions.
All the inner wall portions of the closed container and the first heat conductive portion are integrally formed .
A heat storage unit having a second heat conductive portion connected at an intersection intersecting with the first heat conductive portion. The heat storage unit according to claim 1, wherein all the inner wall portions and the first heat conduction portion of the closed container are made of metal. The heat storage unit according to claim 1 or 2 , wherein at least one end and the other end of the second heat conduction portion are connected to the inner wall portion of the closed container and integrally formed. The heat storage unit according to any one of claims 1 to 3, wherein the first heat conductive portion and the second heat conductive portion form a three-dimensional network structure. Any one of claims 1 to 4 , which has a plurality of the second heat conductive portions, and each of the plurality of the first heat conductive portions is connected at an intersection intersecting with the plurality of the second heat conductive portions. The heat storage unit described in. At least a part of the second heat conductive portion is columnar or linear, and the columnar or linear first heat conductive portion and the columnar or linear second heat conductive portion are centered on each other. The heat storage unit according to any one of claims 1 to 5 , which is connected so that the axes intersect. The number density of the plurality of said second heat conductive portion, the heat storage unit according to a small claim 6 than the number density of the plurality of the first heat conductive portion. A closed container having a first wall of thermal conductivity in contact with the heat source and a second wall of non-contact with the heat source.
The phase change heat storage material enclosed in the closed container and
A first that has one end connected to the first inner wall portion corresponding to the first wall and the other end connected to the second inner wall portion corresponding to the second wall and is in contact with the phase change heat storage material. Heat conduction part and
Have,
It has a plurality of the first heat conductive portions, and has a plurality of the first heat conductive portions.
The first inner wall portion, the first heat conduction portion, and the second inner wall portion are integrally formed.
At least a part of the first heat conductive portion is a heat storage unit which is a plurality of columnar or linear heat conductive portions. The heat storage unit according to claim 8 , which has a large number of columnar or linear first heat conductive portions. The heat storage unit according to claim 8 or 9 , wherein the first inner wall portion, the first heat conduction portion, and the second inner wall portion are made of metal. The heat storage unit according to any one of claims 8 to 10 , further comprising a second heat conductive portion connected at an intersection intersecting with the first heat conductive portion. The heat storage unit according to claim 11 , wherein at least one end and the other end of the second heat conductive portion are integrally formed by being connected to the inner wall portion of the closed container. The heat storage unit according to claim 11 or 12 , wherein the first heat conductive portion and the second heat conductive portion form a three-dimensional network structure. One of claims 11 to 13 , which has a plurality of the second heat conductive portions, and each of the plurality of the first heat conductive portions is connected at an intersection intersecting with the plurality of the second heat conductive portions. The heat storage unit described in. At least a part of the second heat conductive portion is columnar or linear, and the columnar or linear first heat conductive portion and the columnar or linear second heat conductive portion are centered on each other. The heat storage unit according to any one of claims 11 to 14 , which is connected so that the axes intersect. Heat storage unit according to the plurality of the number density of the second conductive portion is smaller Claim 15 than the number density of the plurality of the first heat conductive portion.

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