Latent heat storage material charge and method for producing latent heat storage material charge

Abstract

To provide a latent heat storage material loaded object that can suppress impact from stress loading which impacts on an end of a storage member even when a volume transformation with a phase change occurs in a latent heat storage material that is loaded into the storage member, and to provide a method for manufacturing the same.SOLUTION: A latent heat storage material loaded object 1 is formed by loading a latent heat storage material 10 for storing heat or radiating the heat using out-going or incoming latent heat with a phase change into an internal space 31S of a storage member 30 fully. The latent heat storage material 10 is loaded into the internal space 31S while a buffer material 20 is interposed between an end 32a of the storage member 30 forming the internal space 31S and the latent heat storage material. The buffer material 20 comprises a substance that exhibits non-affinity to the latent heat storage material 10 in a liquid phase state.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a latent heat storage material that stores or releases heat, a latent heat storage material composition obtained by mixing such a latent heat storage material with an additive, and a latent heat storage material charge obtained by charging the latent heat storage material charge into the internal space of a housing member, and a method for producing the same. [Background technology]

[0002] Phase change materials (PCMs) have the physical property of storing or releasing heat by utilizing the inflow and outflow of latent heat accompanying a phase change. By storing heat such as exhaust heat in advance and extracting the stored heat as needed, energy can be effectively utilized without waste. The phase change material is filled without leaking into the internal space of the housing member and is used in a state in which the sealing in the housing member is enhanced. The phase change material generates a phase change in the housing member, stores latent heat when changing from a solid phase state to a liquid phase state, and releases the latent heat when changing from the solid phase state to the liquid phase state. The phase change material can repeat the heat transfer cycle of storing latent heat and releasing the stored latent heat multiple times. An example of a latent heat storage material loaded with such a latent heat storage material in a housing member is disclosed in Patent Document 1.

[0003] Patent Document 1 is a technology disclosed in a patent application by the present applicant, which is a method for sealing a heat storage material in a container, in which an anhydrous hydrate obtained by removing hydration water contained in an inorganic salt hydrate and added water are hydrated in a container to generate an inorganic salt hydrate that serves as a heat storage material, and the inorganic salt hydrate is sealed in the container. In Patent Document 1, the gaps between adjacent powders before the anhydrous hydrate is filled in the container with water added during the hydration reaction, so that the volume filling rate of the heat storage material relative to the volume of the container is significantly improved compared to when powdered inorganic salt hydrate is directly filled in the container. Therefore, the generation of gaps is suppressed, and the time required for heat conduction between the heat storage material and the heat medium in the heat storage tank is shortened, thereby improving the heat transfer performance of the heat storage material. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-77035 A Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Document 1 is a highly effective technology for improving the heat transfer performance of a heat storage material. However, while continuing to advance technological development related to latent heat storage materials, the applicant has found new technical problems in conventional latent heat storage material loads, including the technology of Patent Document 1, when using the latent heat storage material loaded in a housing member.

[0006] That is, the latent heat storage material is generally used by repeating the heat transfer cycle several times, and in the internal space of the sealed housing member, the latent heat storage material repeats reversible phase changes between the liquid phase and the solid phase many times. Also, when the latent heat storage material changes from the solid phase to the liquid phase in the internal space of the sealed housing member, the latent heat storage material expands, and the volume transformation of the latent heat storage material occurs due to the density difference between the solid phase and the liquid phase. Due to this volume transformation, the volume of the latent heat storage material in the liquid phase increases by about 10% compared to the solid phase.

[0007] On the other hand, the latent heat storage material may be filled in a thin resin bag as a storage member, and the end of the bag may be sealed by fusion. In such a case, the latent heat storage material undergoes a reversible phase change between the liquid phase and the solid phase, and expands and contracts repeatedly, which causes a large stress load on the resin bag containing the latent heat storage material. Therefore, when the heat transfer cycle is repeated multiple times in the latent heat storage material, fatigue failure occurs over time at the fusion part, which is prone to stress concentration, and there is a risk that the latent heat storage material that was loaded will leak out of the resin bag.

[0008] The present invention has been made to solve the above-mentioned problems, and aims to provide a latent heat storage material load that can suppress the effect of stress load on the end of a storage member even if a volume transformation associated with a phase change occurs in the latent heat storage material loaded inside the storage member, and a method for manufacturing the same. [Means for solving the problem]

[0009] In order to achieve the above object, the latent heat storage material loaded material and the manufacturing method thereof according to the present invention have the following configurations.

[0010] (1) A latent heat storage material load is formed by loading a latent heat storage material, which stores or releases heat by utilizing the flow of latent heat accompanying a phase change, into the internal space of a containing member without leaking, characterized in that the latent heat storage material is loaded into the internal space with a buffer material interposed between the latent heat storage material and the end of the containing member that forms the internal space, and that the buffer material is made of a substance that is incompatible with the latent heat storage material in a liquid phase state. (2) In the latent heat storage material loaded article described in (1), the storage member is formed into a cylindrical body or a bag-shaped body having an opening for filling the latent heat storage material, the latent heat storage material and the cushioning material are loaded into the internal space with the opening of the storage member sealed by welding or bonding, and the cushioning material is arranged adjacent to the sealing portion of the storage member that has been welded or bonded. (3) In the latent heat storage material loaded material described in (2), when the sealing portions are present in multiple locations, the cushioning material is arranged to target at least one of the sealing portions among all of the sealing portions. (4) In the latent heat storage material loaded material described in any one of (1) to (3), the latent heat storage material is a heat storage material having at least one of inorganic salt hydrates, clathrate hydrates, and sugar alcohols as a main component. (5) In the latent heat storage material loaded material described in (4), the buffer material is an inorganic salt or an inorganic oxide. (6) In the latent heat storage material loaded material described in (5), the buffer material is a substance that acts as a supercooling prevention agent that promotes the induction of crystallization of the latent heat storage material. (7) A method for manufacturing a latent heat storage material load, in which a latent heat storage material that stores or releases heat by utilizing the flow of latent heat accompanying a phase change is filled into the internal space of a containing member without leaking, is characterized in that a buffer material that is incompatible with the latent heat storage material in a liquid phase is provided, and the buffer material is interposed between an end of the containing member that forms the internal space and the latent heat storage material filled in the internal space. (8) In the method for manufacturing a latent heat storage material loading material described in (7), the storage member is formed into a cylindrical body or a bag-shaped body having an opening for filling the latent heat storage material, and the cushioning material is filled and arranged through the opening in a portion of the storage member adjacent to a sealing portion that has been welded or bonded, and after the cushioning material and the latent heat storage material are filled into the internal space, the opening of the storage member is sealed by welding or bonding. (9) In the method for manufacturing a latent heat storage material load described in (8), under the condition that the latent heat storage material load is placed, the storage member has two upper and lower sealing portions that face each other in a vertical positional relationship, the cushioning material is disposed at least in the lower sealing portion, which is the sealing portion located at the lower side of the two upper and lower sealing portions, and the cushioning material disposed on the lower sealing portion side is a substance having a greater specific gravity than the latent heat storage material. (10) In the method for manufacturing a latent heat storage material loading material described in (9), when the cushioning material is placed in the upper sealing portion, which is the upper sealing portion of the two upper and lower sealing portions, the cushioning material placed on the upper sealing portion side is a substance having a specific gravity smaller than that of the latent heat storage material. Effect of the Invention

[0011] The actions and effects of the latent heat storage material loaded with the above-mentioned configuration of the present invention and the method for producing the same will be described.

[0012] (1) A latent heat storage material load is formed by loading a latent heat storage material, which stores or releases heat by utilizing the flow of latent heat accompanying a phase change, into the internal space of a containing member without leaking, characterized in that the latent heat storage material is loaded into the internal space with a buffer material interposed between the latent heat storage material and the end of the containing member forming the internal space, and that the buffer material is made of a substance that is incompatible with the latent heat storage material in a liquid phase state.

[0013] With this feature, while the latent heat storage material repeats the heat storage and heat release cycle multiple times inside the sealed storage member, the buffer material interposed between the latent heat storage material and the end of the storage member suppresses the latent heat storage material from reaching the end of the storage member, and prevents the stress load caused by the expansion and contraction of the latent heat storage material from directly acting on the end of the storage member. Therefore, in the latent heat storage material loaded item according to the present invention, since fatigue failure caused by the repeated expansion and contraction of the latent heat storage material can be suppressed from occurring over time at the end of the storage member, even if the heat storage and heat release cycle by the latent heat storage material is repeated multiple times, leakage of the latent heat storage material from the storage member is unlikely to occur.

[0014] In the latent heat storage material loaded material and its manufacturing method according to the present invention, the phrase "the buffer material is a substance that has no affinity with the latent heat storage material in a liquid phase" refers to a substance that is non-liquid, such as a powder, a slurry or a gel, or an elastic solid, does not dissolve in the latent heat storage material in a liquid phase, and has physical properties that allow it to exist in a state separated from the latent heat storage material in a liquid phase. Examples of this substance include inorganic salts such as calcium sulfate (melting point 1460°C), calcium silicate (melting point 1540°C), and phosphate hydrates containing sodium ions, as well as inorganic salt oxides such as aluminum oxide, iron oxide (II) (FeO), iron oxide (II,III) (Fe3O4), and iron oxide (III) (Fe2O3), foamed resin materials such as foamed urethane materials, and elastic materials such as rubber materials.

[0015] Therefore, the latent heat storage material loading of the present invention has the excellent effect of suppressing the effect of stress load on the end of the storage member even if the latent heat storage material loaded inside the storage member undergoes a volume transformation due to a phase change.

[0016] In the latent heat storage material loaded article described in (2), the storage member is formed as a cylindrical body or a bag-shaped body having an opening for filling with the latent heat storage material, the latent heat storage material and the buffer material are loaded into the internal space with the opening of the storage member sealed by welding or bonding, and the buffer material is disposed adjacent to the sealing part of the storage member that has been welded or bonded. Also, in the latent heat storage material loaded article described in (3), when there are multiple sealing parts, the buffer material is disposed to target at least one of all the sealing parts.

[0017] Due to these characteristics, the mechanical strength of the sealing portion in the housing member is inevitably low even among the components of the housing member, and stress concentration is particularly likely to occur at the ends of the housing member. However, the effect of stress load on the sealing portion due to expansion and contraction of the latent heat storage material can be reduced by using a cushioning material.

[0018] In the latent heat storage material loaded material described in (4), the latent heat storage material is characterized in that the latent heat storage material is a heat storage material containing at least one of inorganic salt hydrates, inclusion hydrates, and sugar alcohols as a main component.

[0019] Due to this characteristic, latent heat storage materials containing inorganic salt hydrates, inclusion hydrates, or sugar alcohols as their main components can secure a large amount of heat storage per volume compared to paraffin-based heat storage materials, making the latent heat storage materials easy to use.

[0020] In the latent heat storage material loaded material described in (5), the buffer material is characterized in that it is an inorganic salt or an inorganic oxide.

[0021] Due to this characteristic, even if a latent heat storage material whose main component is either an inorganic salt hydrate, an inclusion hydrate, or a sugar alcohol repeatedly undergoes phase changes between a solid state and a liquid state, the buffer material can continue to exist stably in a state separated from the latent heat storage material without undergoing a chemical reaction with the latent heat storage material.

[0022] In the latent heat storage material loaded product described in (6), the buffer material is characterized in that it is a substance that acts as a supercooling prevention agent that promotes the induction of crystallization of the latent heat storage material.

[0023] Due to this characteristic, when the latent heat storage material contains as its main component either an inorganic salt hydrate, an inclusion hydrate, or a sugar alcohol, which have physical properties that make them prone to supercooling, the buffer material can simultaneously play a role in eliminating the supercooling phenomenon in the latent heat storage material, and in addition, by preventing the latent heat storage material from reaching the ends of the containing member, suppress excessive stress concentration that may occur at the ends of the containing member due to the stress load associated with the expansion and contraction of the latent heat storage material.

[0024] (7) A method for manufacturing a latent heat storage material load in which a latent heat storage material that stores or releases heat by utilizing the inflow and outflow of latent heat accompanying a phase change is filled into the internal space of a containing member without leaking, characterized in that a buffer material that is incompatible with the latent heat storage material in a liquid phase state is used, and the buffer material is interposed between the end of the containing member that forms the internal space and the latent heat storage material filled in the internal space.

[0025] Due to this feature, while the latent heat storage material repeats the heat storage and heat release cycle multiple times inside the sealed storage member, the cushioning material prevents the latent heat storage material from reaching the end of the storage member, and prevents the large stress load caused by the expansion and contraction of the latent heat storage material from acting on parts of the end of the storage member that are prone to stress concentration (for example, fused parts when the storage member is a resin bag). Therefore, since the latent heat storage material loaded item can prevent fatigue failure caused by repeated expansion and contraction of the latent heat storage material from occurring over time at the end of the storage member, leakage of the latent heat storage material from the storage member is unlikely to occur even if the heat storage and heat release cycle by the latent heat storage material is repeated multiple times.

[0026] Therefore, according to the manufacturing method of the latent heat storage material loaded material of the present invention, even if the latent heat storage material loaded inside the storage member undergoes a volume transformation due to a phase change, the effect of stress load on the end of the storage member can be suppressed.

[0027] In the manufacturing method of the latent heat storage material loading described in (8), the storage member is formed into a cylindrical body or a bag-shaped body having an opening for filling with the latent heat storage material, and the cushioning material is filled and arranged through the opening in a portion of the storage member adjacent to the sealing portion that has been welded or bonded, and after the cushioning material and the latent heat storage material are filled into the internal space, the opening of the storage member is sealed by welding or bonding.

[0028] Due to this characteristic, the mechanical strength of the sealing part in the housing member is inevitably low even among the parts of the housing member, and stress concentration is particularly likely to occur at the ends of the housing member. However, the effect of stress load on the sealing part due to expansion and contraction of the latent heat storage material can be reduced by the use of a cushioning material.

[0029] In the method for manufacturing a latent heat storage material load described in (9), under the condition that the latent heat storage material load is placed, the storage member has two upper and lower sealing portions that face each other in a vertical positional relationship, the cushioning material is disposed at least in the lower sealing portion, which is the lower sealing portion of the two upper and lower sealing portions, and the cushioning material disposed on the lower sealing portion side is a substance having a greater specific gravity than the latent heat storage material.

[0030] Due to this feature, the buffer material can remain in a state where it is settled below the molten liquid of the latent heat storage material, and even when the latent heat storage material solidifies, the buffer material can continue to remain adjacent to the end portion on the lower sealing portion side.

[0031] In the manufacturing method of the latent heat storage material loaded material described in (10), when a cushioning material is placed in the upper sealing part, which is the upper sealing part of the two upper and lower sealing parts, the cushioning material placed on the upper sealing part side is a substance having a specific gravity smaller than that of the latent heat storage material.

[0032] Due to this feature, the buffer material can maintain a floating state below the molten latent heat storage material, and even when the latent heat storage material solidifies, the buffer material can continue to remain adjacent to the end portion on the upper sealing portion side. [Brief description of the drawings]

[0033] [Figure 1] 1A and 1B are explanatory diagrams showing schematic diagrams of latent heat storage material loadings according to an embodiment, where (a) shows a latent heat storage material loading according to Example 1, (b) shows a latent heat storage material loading according to Example 2, and (c) shows a latent heat storage material loading according to Example 3. [Diagram 2] FIG. 2 is an explanatory diagram illustrating a latent heat storage material composition loaded in a latent heat storage material load according to an embodiment. [Diagram 3] FIG. 2 is a flow diagram showing steps of a method for producing a latent heat storage material loaded material according to Example 1 of the embodiment. [Figure 4] FIG. 2 is an explanatory diagram illustrating the function of the latent heat storage material charged according to the first embodiment. [Diagram 5] FIG. 2 is an explanatory diagram illustrating a phenomenon occurring in the latent heat storage material loaded item according to Comparative Example 1. [Figure 6] FIG. 11 is an explanatory diagram illustrating the function of the latent heat storage material charged in Example 3. [Figure 7] FIG. 11 is an explanatory diagram illustrating a phenomenon occurring in the latent heat storage material loaded material according to Comparative Example 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The latent heat storage material charge according to the present invention and the method for manufacturing the latent heat storage material charge will be described in detail below with reference to the drawings. The latent heat storage material charge according to the present invention is a latent heat storage material that stores or releases heat by utilizing the inflow and outflow of latent heat accompanying a phase change, which is charged without leaking into the internal space of a housing member, and is used for the purpose of utilizing the thermal energy of the latent heat stored in the latent heat storage material at a demand destination.

[0035] As an example, in the case of an application in which a latent heat storage material load is accommodated in a heat storage tank filled with a heat medium, for example, the heat medium such as water stored in the heat storage tank is heated using exhaust heat from a gas engine system of cogeneration (cogeneration or combined heat and power) installed in an emergency power source in a hospital or building, or exhaust heat generated in facilities such as factories, offices, large facilities, and homes. The latent heat storage material in the latent heat storage material load temporarily stores latent heat from the heat medium in a temperature range near its heating temperature, and then releases the stored latent heat with a time difference, and can be supplied to a heat demand destination via the heat medium. The latent heat storage material repeats the cycle of storing and releasing heat multiple times as necessary in the loaded storage member container. Hereinafter, the latent heat storage material load according to the present invention will be described by taking latent heat storage materials in which inorganic salt hydrates, inclusion hydrates, and sugar alcohols are the main components in this embodiment.

[0036] First, the outline of the latent heat storage material charge will be briefly described with reference to FIG. 1. FIG. 1 is an explanatory diagram showing a schematic diagram of a latent heat storage material charge according to an embodiment, in which (a) shows a latent heat storage material charge according to Example 1, (b) shows a latent heat storage material charge according to Example 2, and (c) shows a latent heat storage material charge according to Example 3. In FIG. 1, under the condition that the latent heat storage material charge 1 is placed in a predetermined installation means such as a heat storage tank, the direction along the vertical direction VT is the up-down direction in FIG. 1, and the direction along the horizontal direction HZ is the left-right direction in FIG. 1. The directions defined in FIG. 1 are also applicable to each of the figures from FIG. 3 onwards. FIG. 2 is an explanatory diagram showing a schematic diagram of a latent heat storage material composition charged in a latent heat storage material charge according to an embodiment.

[0037] <About latent heat storage material 10> 1 and 2, the latent heat storage material charge 1 is composed of a latent heat storage material 10 (or a heat storage material mixture 12), a buffer material 20, a housing member 30, etc. The latent heat storage material 10 is a heat storage material mainly composed of an inorganic salt hydrate, for example, an acetate hydrate such as sodium acetate trihydrate, a diphosphate (pyrophosphate) hydrate such as sodium diphosphate decahydrate, a phosphate hydrate such as disodium hydrogen phosphate dodecahydrate, an alum hydrate such as ammonium alum dodecahydrate, potassium alum dodecahydrate, or a sulfate hydrate such as aluminum sulfate hydrate.

[0038] The latent heat storage material 10 is a heat storage material mainly composed of an inclusion hydrate such as tetrabutylammonium chloride hydrate, tetrabutylammonium bromide hydrate, tetrabutylammonium fluoride hydrate, etc. The latent heat storage material 10 is a heat storage material mainly composed of a sugar alcohol such as erythritol, lactitol, mannitol, sorbitol, xylitol, etc.

[0039] In the latent heat storage material charge 1 according to this embodiment, the latent heat storage material 10 is a heat storage material having physical properties that easily cause a supercooling phenomenon at a temperature lower than the melting point from a liquid phase state, such as ammonium alum dodecahydrate, which is given as an example from among the heat storage materials mainly composed of the inorganic salt hydrates, inclusion hydrates, and sugar alcohols listed above as examples. The physical properties of ammonium alum dodecahydrate are hydration number 12, molecular weight [g / mol] 453.34, melting point 93.5°C, heat storage amount 270 to 280 (kJ / kg), solid at room temperature, and soluble in water. Ammonium alum dodecahydrate stores latent heat when changing from a solid phase state to a liquid phase state at the melting point, and releases latent heat when changing from a liquid phase state to a solid phase state.

[0040] The latent heat storage material charge 1 may be a first case in which such a latent heat storage material 10 is charged alone in the storage member 30, or a second case in which the latent heat storage material 10 is charged together with an additive 11 that adjusts the physical properties of the latent heat storage material 10 in the storage member 30. That is, in the second case, as shown in Fig. 2, a heat storage material mixture 12 obtained by mixing the latent heat storage material 10 with the additive 11 is charged in the storage member 30. The additive 11 is a substance that has affinity with the latent heat storage material 10 and has physical properties that allow it to be dissolved in the melt of the latent heat storage material 10.

[0041] Specifically, the additive 11 is, for example, a melting point adjuster, a thickener, a softener, a colorant, etc. The melting point adjuster is, for example, an additive having the effect of adjusting the melting point of the latent heat storage material 10, such as calcium sulfate, calcium silicate, a phosphate compound containing calcium ions, etc. The thickener plays a role of thickening the molten liquid of the latent heat storage material 10, and is capable of maintaining the components of the latent heat storage material 10 in a uniform mixed state, and is an additive having the effect of suppressing phase separation of the latent heat storage material 10 and separation of the compounds due to differences in density between the latent heat storage material 10 and other additives mixed with the latent heat storage material 10. Examples of thickeners include substances belonging to sugar alcohols and substances belonging to polysaccharides.

[0042] The softening agent is an additive that adjusts the physical properties of the latent heat storage material 10 in a solid phase so that the material has a certain degree of flexibility. An example of the softening agent is glycerin. The coloring agent is an additive that colors the latent heat storage material 10. Examples of the coloring agent include food coloring and pigments.

[0043] In addition, the additive 11 contained in the heat storage material mixture 12 is not particularly limited to a specific substance, and as long as it is an additive that has the effect of adjusting the physical properties of the latent heat storage material 10, it can be appropriately changed depending on the application of the latent heat storage material load 1.

[0044] In addition, the latent heat storage material to be loaded into the latent heat storage material charge can be a paraffin-based heat storage material other than a heat storage material mainly composed of inorganic salt hydrate, inclusion hydrate, or sugar alcohol. However, the use of a paraffin-based heat storage material is not preferable from the viewpoint of heat storage and heat dissipation performance and handling. The reason for this is that, although the heat storage capacity of paraffin-based heat storage materials differs depending on the substance and cannot be generally compared, the specific gravity is approximately 0.9 and the heat storage capacity per volume is approximately 220 to 240 kJ / kg, which is lower than that of inorganic salt hydrates such as ammonium alum dodecahydrate, which has a heat storage capacity of 270 to 280 (kJ / kg) as exemplified above. Moreover, paraffin-based heat storage materials are flammable and may require safety measures regarding fire, making them difficult to use.

[0045] <Regarding the storage member 30> FIG. 3 is a flow diagram showing the steps of a method for manufacturing a latent heat storage material loaded material according to Example 1 of the embodiment. As shown in FIG. 3, the storage member 30 is formed in a cylindrical, bag-like, or tubular shape having an opening 33 for filling. Specifically, the storage member 30 is made of a flexible resin such as polypropylene (PP) or polyethylene (PE), and in this embodiment, the storage member 30 is made of a mixed resin material in which polypropylene, which has excellent weather resistance against high temperatures and processability by heat fusion, is the main component, and another resin component is added to ensure its flexibility. The resin layer thickness of the storage member 30 is approximately less than 1 mm, and in this embodiment, it is approximately 0.2 to 0.7 mm.

[0046] <About cushioning material 20> The buffer material 20 is a substance that has no affinity with the liquid-phase latent heat storage material 10. In this embodiment, the buffer material 20 is a substance that acts as a supercooling prevention agent that promotes the induction of crystallization of the latent heat storage material 10. When the above-mentioned ammonium alum dodecahydrate is the latent heat storage material 10, the buffer material 20 is, for example, calcium sulfate or the like, a powder or gel-like, non-liquid inorganic salt, or an inorganic salt oxide.

[0047] The buffer material 20 is not limited to a supercooling prevention agent for the latent heat storage material 10, and can be changed as appropriate depending on the application of the latent heat storage material charge 1 as long as it is a substance that has no affinity with the liquid-phase latent heat storage material 10. As one example, the buffer material 20 may be a material or member that is elastic and non-liquid, such as a foamed resin material such as a urethane foam material, or a rubber material, and that has properties that can absorb the expansion and contraction of the latent heat storage material 10.

[0048] In the latent heat storage material charge 1, as shown in FIG. 1 and FIG. 3, the latent heat storage material 10 (or the heat storage material mixture 12, hereinafter, the latent heat storage material 10 and the heat storage material mixture 12 may be collectively referred to as "latest heat storage material 10, etc.") is loaded into the internal space 31S with the buffer material 20 interposed between the end 32a of the storage member 30 forming the internal space 31S. That is, in this embodiment, the latent heat storage material 10, etc. and the buffer material 29 are loaded into the internal space 31S with the opening 33 of the storage member 30 sealed by fusion (welding) of the storage member 30. The buffer material 20 is disposed adjacent to the fused sealing portion 40 of the storage member 30. When the sealing portion 40 is present in a plurality of places, the buffer material 20 is disposed for at least one specific sealing portion 40X among all the sealing portions 40.

[0049] A specific description will be given. As shown in Fig. 1, the latent heat storage material charge 1 is configured in three modes as shown in Examples 1 to 3 according to the arrangement conditions of the latent heat storage material charge 1 in a predetermined installation means such as a heat storage tank, vertically arranged along a vertical direction VT, or horizontally arranged along a horizontal direction HZ.

[0050] <Example 1> As shown in FIG. 1(a), the latent heat storage material charge 1A(1) according to the first embodiment is intended for a case in which it is placed vertically in a predetermined installation means. The sealing portion 40 of the housing member 30 is located at two places facing each other in a vertical positional relationship. In the latent heat storage material charge 1A, the buffer material 20 and the latent heat storage material 10 are filled between the sealing portion 40 (lower sealing portion 40L) located at the lower side and the sealing portion 40 (upper sealing portion 40U) located at the upper side, and only the lower sealing portion 40L is the specific sealing portion 40X, and the buffer material 20 is not arranged on the upper sealing portion 40U side.

[0051] <Example 2> As shown in Fig. 1(b), the latent heat storage material load 1B(1) according to the second embodiment is intended for a case where it is placed vertically in a predetermined installation means. The housing member 30 has two sealing parts 40 that face each other in a vertical positional relationship. In the latent heat storage material load 1B, the buffer material 20 and the latent heat storage material 10, etc. are filled between the lower sealing part 40L and the upper sealing part 40U, and both the lower sealing part 40L and the upper sealing part 40U are specific sealing parts 40X.

[0052] <Example 3> As shown in Fig. 1(c), the latent heat storage material load 1C(1) according to the third embodiment is intended for a case where it is placed horizontally in a predetermined installation means. The storage member 30 has two sealing parts 40 that face each other in a left-right positional relationship. In the latent heat storage material load 1C, the buffer material 20 and the latent heat storage material 10, etc. are filled between the left and right sealing parts 40, and both the left and right sealing parts 40 are specific sealing parts 40X.

[0053] Next, a description will be given of a method for manufacturing the latent heat storage material charge 1 according to the embodiment. In the method for manufacturing the latent heat storage material charge 1 according to the embodiment, a buffer material 20 is interposed between an end 32a of the storage member 30 forming the internal space 31S and the latent heat storage material 10 or the like filled in the internal space 31S.

[0054] 3(a) and 3(b), in manufacturing the latent heat storage material loaded item 1A(1), the cushioning material 20 is filled into the internal space 31S of the bottomed housing member 30 in which the lower sealing portion 40L (sealing portion 40) is already provided through the opening 33, and is disposed adjacent to the end portion 32a on the lower sealing portion 40L side. By filling and disposing the cushioning material 20 through the opening 33 in the portion adjacent to the lower sealing portion 40L, the lower sealing portion 40L becomes the specific sealing portion 40X.

[0055] At this time, it is important that the buffer material 20 disposed on the lower sealing portion 40L side is a substance having a higher specific gravity than the latent heat storage material 10, etc. This is because the buffer material 20 maintains a state in which it sinks below the molten liquid of the latent heat storage material 10, etc., and even when the latent heat storage material 10, etc., turns into a solid phase, the buffer material 20 can continue to maintain a state adjacent to the end portion 32a on the lower sealing portion 40L side.

[0056] Next, the latent heat storage material 10 and the like are filled on the cushioning material 20 from the opening 33 (FIG. 3(c)). After the cushioning material 20 and the latent heat storage material 10 are filled into the internal space 31S, the opening 33 of the housing member 30 is sealed by fusion (welding) while keeping the remaining void 50S small to form an upper sealing portion 40U (sealing portion 40). In this way, the latent heat storage material loaded item 1A(1) is formed.

[0057] Furthermore, when manufacturing the latent heat storage material charge 1B(1), the buffer material 20 is disposed not only in the lower sealing portion 40L but also in the upper sealing portion 40U, so that, as shown in FIG. 3(c), after the buffer material 20 and the latent heat storage material 10 are filled in the internal space 31S, the buffer material 20 is again filled from the opening 33. At this time, it is important that the buffer material 20 disposed on the upper sealing portion 40U side is a substance having a smaller specific gravity than the latent heat storage material 10, etc. This is because the buffer material 20 maintains a state of floating under the melt of the latent heat storage material 10, etc., and even when the latent heat storage material 10, etc., is solidified, the buffer material 20 can continue to maintain a state adjacent to the end 32a on the upper sealing portion 40U side.

[0058] Next, after filling the upper sealing portion 40U side with the buffer material 20, the opening 33 of the housing member 30 is sealed by fusion (welding) while keeping the remaining gap 50S smaller, to form the upper sealing portion 40U (sealing portion 40). In this manner, the latent heat storage material load 1B(1) is constructed. Note that although the arrangement conditions in a predetermined installation means differ between the latent heat storage material load 1B(1) and the latent heat storage material load 1C(1) (vertical and horizontal placement), the manufacturing method of the latent heat storage material loads 1B and 1C(1) is the same for both.

[0059] However, since the latent heat storage material load 1C(1) is placed horizontally, the specific gravity of the buffer material 20 may be the same as or different from the specific gravity of the latent heat storage material 10, etc. Also, the constituent materials of the buffer material 20 may be the same or different materials in both the left and right specific sealing portions 40X, and in the case of different materials, there is no need to set a condition for the relationship in the magnitude of the specific gravity between the two.

[0060] Next, a description will be given of a durability test performed on the latent heat storage material charge 1 according to this embodiment. The applicant performed a durability test on the latent heat storage material charge 1 in which a cycle of storing heat in the latent heat storage material 10 and releasing the heat was repeated multiple times in the housing member 30 in order to verify the significance of the latent heat storage material charge 1.

[0061] FIG. 4 is an explanatory diagram showing the action of the latent heat storage material charge according to Example 1. FIG. 5 is an explanatory diagram showing the phenomenon that occurred in the latent heat storage material charge according to Comparative Example 1. In the durability test, four samples were used for each of the latent heat storage material charge 1A(1) according to Example 1, which is provided with the buffer material 20 as shown in FIG. 4, and the latent heat storage material charge 100A according to Comparative Example 1, which is not provided with the buffer material as shown in FIG. 5, and the durability of these samples was compared between Example 1 and Comparative Example 1. Note that FIG. 4 and FIG. 5, and FIG. 6 and FIG. 7 related to these figures, are illustrated with emphasis on the deformation of the storage member 30 due to the expansion of the latent heat storage material 10.

[0062] The durability test was performed for both the latent heat storage material loads 1A and 100A under the same conditions for the latent heat storage material 10, the housing member 30, and the sealing portion 40, except for the condition of the presence or absence of the buffer material 20, and the opening 33 of the housing member 30 was sealed by fusion (welding) while the remaining gap 50S was suppressed to a smaller size. In the latent heat storage material loads 1A and 100A, potassium alum dodecahydrate was used as the latent heat storage material 10, and the additives 11 were potassium chloride and mannitol. In the latent heat storage material load 1A, the filling amount of the buffer material 20 in the internal space 31S was set to about 10% of the total length of the housing member 30 in the vertical direction VT. The worker visually inspected the latent heat storage material loads 1A and 100A for damage to the containing member 30, leakage of the latent heat storage material 10 from the internal space 31S, and the like.

[0063] The results of the durability test were as follows: In the latent heat storage material charge 1A(1) according to Example 1, even when the number of heat storage and heat release cycles reached 1107, which was checked during the test, no damage to the containing member 30 or leakage of the latent heat storage material 10 was confirmed, and in all four samples used in the test, the latent heat storage material charge 1A(1) was in a normal state in which it could continue the subsequent heat storage and heat release cycles.

[0064] In contrast, in the latent heat storage material loaded 100A according to Comparative Example 1, of the four samples tested, three samples were damaged mainly at the lower sealing portion 40L (sealing portion 40) side after several hundred cycles of heat storage and heat release, less than 1000 cycles, causing leakage of the latent heat storage material 10, etc., and the latent heat storage material loaded 100A in all samples became unusable.

[0065] <Consideration> The conditions of the latent heat storage material 10, the housing member 30, and the sealing portion 40 are substantially the same in Example 1 and Comparative Example 1. In addition, the latent heat storage material 10 expands in the housing member 30, which is sealed and repeats a heat storage and heat release cycle in which the heat storage process (liquid phase) and the heat release process (solid phase) are alternately performed multiple times. In both Example 1 and Comparative Example 1, the resin housing member 30 is subjected to stress load due to expansion and contraction caused by the phase change between the solid and liquid phases of the latent heat storage material 10. In addition, the sealing portion 40 of the housing member 30 is sealed by fusing the end of the housing member 30, and the mechanical strength of the sealing portion 40 is necessarily small in the housing member 30, and stress concentration is easily generated, particularly at the end 32a of the housing member 30.

[0066] As shown in FIG. 4, in the case of Example 1, the latent heat storage material charge 1A includes a buffer material 20. Therefore, the buffer material 20 suppresses the arrival of the latent heat storage material 10, etc., at the sealing portion 40 where stress concentration is likely to occur, and prevents a large stress load caused by the expansion and contraction of the latent heat storage material 10 from directly acting on the sealing portion 40. That is, the latent heat storage material 10, etc., is suppressed by the buffer material 20 from reaching the sealing portion 40. Therefore, when the latent heat storage material 10 expands and contracts due to the phase change, the stress that tries to expand and contract in the horizontal direction HZ acts on the region above the buffer material 20 in the housing member 30.

[0067] At this time, especially in the vicinity of directly above the buffer material 20, the stress acting on the housing member 30 in the horizontal direction HZ due to the weight of the latent heat storage material 10, etc., becomes larger, and the deformation amount of the housing member 30 in the horizontal direction HZ also becomes larger. On the other hand, the housing member 30 is made of a flexible resin and can expand and contract in the horizontal direction HZ in response to the above-mentioned stress, so that the expansion and contraction of the latent heat storage material 10, etc. can be absorbed by the outer peripheral edge portion 34 of the housing member 30. In addition, when the sealing portion 40 on the opening 33 side of the housing member 30 is fused, the remaining portion is suppressed to a smaller size, so that the void 50S in the housing member 30 can enter and exit the space for the expansion of the latent heat storage material 10, etc., as an expansion allowance for the latent heat storage material 10, etc., and can contribute to absorbing the expansion and contraction accompanying the phase change of the latent heat storage material 10.

[0068] Therefore, since the effect of stress load due to expansion and contraction of the latent heat storage material 10 on the sealing portions 40 (lower sealing portion 40L, upper sealing portion 40U) is reduced, fatigue failure of the sealing portions 40 is suppressed, and it is presumed that the latent heat storage material load 1A is maintained in a normal state without causing damage to the sealing portions 40.

[0069] In contrast, as shown in Fig. 5, in Comparative Example 1, the latent heat storage material charge 100A does not include a buffer material 20. Therefore, the structure is such that the stress load due to the expansion and contraction of the latent heat storage material 10 acts directly on the sealing portion 40 (lower sealing portion 40L) where stress concentration is likely to occur. As a result, in Comparative Example 1, it is believed that fatigue failure occurred mainly on the lower sealing portion 40L (sealing portion 40) side over time, leading to leakage of the latent heat storage material 10.

[0070] Fig. 6 is an explanatory diagram showing the action of the latent heat storage material loaded in Example 3. Fig. 7 is an explanatory diagram showing the phenomenon occurring in the latent heat storage material loaded in Comparative Example 2. In addition to the durability tests in Example 1 and Comparative Example 1, findings similar to those in the durability test results were obtained when the latent heat storage material loaded 1C(1) in Example 3 and Comparative Example 2 were used for confirmation.

[0071] That is, as shown in Fig. 6, in the latent heat storage material load 1C(1) according to Example 3, the buffer material 20 prevents the latent heat storage material 10 from reaching the sealing portion 40, and prevents a large stress load caused by the expansion and contraction of the latent heat storage material 10 from directly acting on the sealing portion 40. In other words, the latent heat storage material 10, etc. are prevented from reaching the sealing portion 40 by the buffer material 20. Therefore, when the latent heat storage material 10 expands and contracts due to a phase change, in the housing member 30, a stress that tries to expand and contract in the vertical direction VT acts on the area sandwiched between the buffer materials 20 on both the left and right.

[0072] At this time, especially in the vicinity of the left and right buffer materials 20, the expansion and contraction of the latent heat storage material 10 and the like in the horizontal direction HZ is restricted. Therefore, the stress acting on the housing member 30 in the vertical direction VT becomes larger, and the deformation amount of the housing member 30 in the vertical direction VT also becomes larger. On the other hand, the housing member 30 is made of a flexible resin and can expand and contract in the vertical direction VT following the above-mentioned stress, so that the expansion and contraction of the latent heat storage material 10 can be absorbed by the outer peripheral edge portion 34 of the housing member 30. Therefore, since the influence of the stress load due to the expansion and contraction of the latent heat storage material 10 on the sealing portion 40 is reduced by the buffer material 20, fatigue failure of the sealing portion 40 is suppressed, and the sealing portion 40 is less likely to break.

[0073] 7, the latent heat storage material load 100B according to Comparative Example 2 does not include the buffer material 20. Therefore, if a larger stress load due to the expansion and contraction of the latent heat storage material 10 acts on the sealing portion 40, which is prone to stress concentration, beyond the limit at which the expansion of the latent heat storage material 10 can be absorbed, fatigue failure will occur in the sealing portion 40, and the sealing portion 40 will be easily damaged.

[0074] Next, the functions and effects of the latent heat storage material charge 1 and the method for producing the latent heat storage material charge 1 according to this embodiment will be described.

[0075] The latent heat storage material load 1 of this embodiment is a latent heat storage material load in which latent heat storage material 10, which stores or releases heat by utilizing the entry and exit of latent heat associated with a phase change, is loaded without leaks into the internal space 31S of a storage member 30, and is characterized in that the latent heat storage material 10 is loaded into the internal space 31S with a buffer material 20 interposed between the latent heat storage material 10 and the end 32a of the storage member that forms the internal space 31S, and that the buffer material 20 is made of a substance that is incompatible with the latent heat storage material 10 in a liquid phase state.

[0076] In addition, the manufacturing method of the latent heat storage material loaded material 1 according to this embodiment is characterized in that, in the manufacturing method of the latent heat storage material loaded material 1, the latent heat storage material 10, which stores or releases heat by utilizing the inflow and outflow of latent heat associated with a phase change, is packed thoroughly into the internal space 31S of the storage member 30, and that the buffer material 20 has a property capable of absorbing the expansion of the latent heat storage material due to the phase change and is incompatible with the latent heat storage material 10 in a liquid phase state, and that the buffer material 20 is interposed between the end 32a of the storage member 30 that forms the internal space 31S and the latent heat storage material 10 filled in the internal space 31S.

[0077] Due to these characteristics, while the latent heat storage material 10 repeats the heat storage and heat release cycle multiple times within the sealed storage member 30, the buffer material 20 suppresses the arrival of the latent heat storage material 10 at the sealing portion 40, and prevents a large stress load caused by the expansion and contraction of the latent heat storage material 10 from directly acting on the sealing portion 40. Therefore, in the latent heat storage material loaded item 1, the influence of the stress load caused by the expansion and contraction of the latent heat storage material 10 at the sealing portion 40 can be reduced, and damage to the sealing portion 40 due to fatigue failure can be suppressed. Therefore, even if the heat storage and heat release cycle by the latent heat storage material 10 is repeated multiple times, leakage of the latent heat storage material 10 from the storage member 30 is unlikely to occur.

[0078] Therefore, the latent heat storage material charge 1 according to this embodiment has an excellent effect of suppressing the influence of stress load on the sealing portion 40 of the housing member 30 even if volume transformation accompanying a phase change occurs in the latent heat storage material 10 charged in the internal space 31 of the housing member 30. In addition, the manufacturing method of the latent heat storage material charge 1 according to this embodiment also has the same effect as the latent heat storage material charge 1 according to this embodiment.

[0079] In the latent heat storage material loaded 1 according to this embodiment, the storage member 30 is formed as a cylindrical body or a bag-shaped body having an opening 33 for filling the latent heat storage material 10, the latent heat storage material 10 and the buffer material 20 are loaded into the internal space 31S with the opening 33 of the storage member 30 sealed by welding, and the buffer material 20 is disposed adjacent to the sealing portion 40 of the storage member 30 that has been welded. In addition, in the latent heat storage material loaded 1 according to this embodiment, when the sealing portion 40 is present in a plurality of places, the buffer material 20 is disposed to target at least one specific sealing portion 40X (sealing portion 40) among all the sealing portions 40.

[0080] Furthermore, in the manufacturing method of the latent heat storage material loaded item 1 according to this embodiment, the storage member 30 is formed as a cylindrical body or a bag-shaped body having an opening 33 for filling with the latent heat storage material 10, and the cushioning material 20 is filled and arranged in a portion of the storage member 30 adjacent to the sealing portion 40 to which welding has been applied, through the opening 33, and after the cushioning material 20 and the latent heat storage material 10 are filled in the internal space 31S, the opening 33 of the storage member 30 is sealed by welding.

[0081] Due to these characteristics, the mechanical strength of the sealing portion 40 in the housing member 30 is inevitably the smallest among the portions of the housing member 30, and stress concentration is particularly likely to occur at the end portion 32a of the housing member 30. However, the effect of the stress load caused by the expansion and contraction of the latent heat storage material 10 on the sealing portion 40 can be reduced by the buffer material 20.

[0082] Furthermore, in the latent heat storage material charge 1 according to this embodiment, the latent heat storage material 10 is characterized in that it is a heat storage material containing at least one of inorganic salt hydrates, clathrate hydrates, and sugar alcohols as a main component.

[0083] Due to this characteristic, the latent heat storage material 10 containing inorganic salt hydrate, inclusion hydrate, or sugar alcohol as its main component can secure a large amount of heat storage per volume compared to paraffin-based heat storage materials, making the latent heat storage material 10 easy to use.

[0084] Moreover, the latent heat storage material charge 1 according to this embodiment is characterized in that the buffer material 20 is an inorganic salt or an inorganic oxide.

[0085] Due to this characteristic, even if the latent heat storage material 10, whose main component is either an inorganic salt hydrate, an inclusion hydrate, or a sugar alcohol, repeatedly undergoes phase changes between a solid state and a liquid state, the buffer material 20 can continue to exist stably in a state separated from the latent heat storage material 10 without undergoing a chemical reaction with the latent heat storage material 10.

[0086] Further, the latent heat storage material charge 1 according to this embodiment is characterized in that the buffer material 20 is a substance that acts as a supercooling prevention agent that promotes the induction of crystallization of the latent heat storage material 10.

[0087] Due to this feature, when the latent heat storage material 10 contains as its main component an inorganic salt hydrate, an inclusion hydrate, or a sugar alcohol, which has physical properties that make it prone to the supercooling phenomenon, the buffer material 20 can simultaneously fulfill the role of eliminating the supercooling phenomenon for the latent heat storage material 10, and the role of suppressing excessive stress concentration that may occur at the end 32a of the accommodating member 30 due to the stress load associated with the expansion and contraction of the latent heat storage material 10 by suppressing the latent heat storage material 10 from reaching the sealing portion 40 of the accommodating member 30.

[0088] Furthermore, in the manufacturing method of the latent heat storage material load 1 according to this embodiment, under the condition that the latent heat storage material load 1 is placed, the storage member 30 has two upper and lower sealing portions 40 that face each other in an upper and lower positional relationship in a direction along the vertical direction VT, the cushioning material 20 is disposed at least in the lower sealing portion 40L, which is the sealing portion located at the lower of the two upper and lower sealing portions 40, and the cushioning material 20 disposed in the lower sealing portion 40L is a substance having a greater specific gravity than the latent heat storage material 10.

[0089] Due to this feature, the buffer material 20 can maintain a state in which it is submerged below the molten liquid of the latent heat storage material 10, etc., and even when this latent heat storage material 10, etc., solidifies, the buffer material 20 can continue to remain adjacent to the end portion 32a on the lower sealing portion 40L side.

[0090] Furthermore, in the manufacturing method of the latent heat storage material loaded material 1 according to this embodiment, when the cushioning material 20 is placed in the upper sealing portion 40U, which is the upper sealing portion of the two upper and lower sealing portions 40, the cushioning material 20 placed in the upper sealing portion 40U is a substance having a specific gravity smaller than that of the latent heat storage material 10.

[0091] Due to this feature, the buffer material 20 can maintain a state in which it floats above the molten liquid of the latent heat storage material 10, etc., and even when the latent heat storage material 10, etc., solidifies, the buffer material 20 can continue to remain adjacent to the end 32a on the upper sealing portion 40U side.

[0092] In the above, the present invention has been described based on the embodiment and Examples 1 to 3. However, the present invention is not limited to the above embodiment and Examples 1 to 3, and can be appropriately modified and applied without departing from the spirit of the present invention.

[0093] (1) For example, in the embodiment, ammonium alum dodecahydrate is given as an example of the latent heat storage material 10 (a latent heat storage material whose main component is either an inorganic salt hydrate, an inclusion hydrate, or a sugar alcohol) to be loaded into the latent heat storage material load 1. However, ammonium alum dodecahydrate is merely one example, and the type of latent heat storage material and its main component are not limited to those in the embodiment, and can be changed as appropriate depending on the manner in which the latent heat is utilized at the demand destination.

[0094] (2) In the embodiment, when the buffer material 20 loaded in the latent heat storage material load 1 is composed of an inorganic salt or an inorganic oxide, the buffer material 20 disposed in the lower sealing portion 40L is a substance having a larger specific gravity than the latent heat storage material 10, and the buffer material 20 disposed in the upper sealing portion 40U is a substance having a smaller specific gravity than the latent heat storage material 10. However, the buffer material in the latent heat storage material load according to the present invention may be, for example, a foamed resin material such as a foamed urethane material, a rubber material, or other elastic non-liquid material, and can be variously changed without being limited to inorganic salts or inorganic oxides, as long as it can be stably arranged and fixed to the sealing portion of the flexible resinous housing member by utilizing the elasticity of the buffer material and the elasticity of the housing member. This is because when the buffer material is composed of such a material, the constituent material of the buffer material can be selected from a wider range of options, regardless of the specific gravity relative to the latent heat storage material.

[0095] (3) In the embodiment, a mixed resin material in which polypropylene is the main component and another resin component is added is given as an example of a flexible resin for the material of the storage member 30 of the latent heat storage material load 1. However, the material of the storage member is merely given as an example in the embodiment, and may be made of metal such as aluminum, copper, stainless steel, etc., and can be changed as appropriate depending on the usage mode of the latent heat at the demand side.

[0096] (4) In the embodiment, the opening 33 of the storage member 30 of the latent heat storage material loaded item 1 is sealed by fusion (welding). However, fusion (welding) is merely one example, and the method of sealing the opening 33 of the storage member 30 can be changed as appropriate depending on the manner in which the latent heat is utilized at the demand destination.

[0097] (5) In the embodiment, an application in which a latent heat storage material load is accommodated in a heat storage tank filled with a heat medium has been given as an example, however, the means for installing the latent heat storage material load of the present invention is not limited to a heat storage tank, and is not particularly limited as long as it is a specified installation means corresponding to a demand for utilizing the thermal energy generated by the stored latent heat, such as inside a heat storage tank, inside a wall or floor of a building, or inside a vinyl house for greenhouse cultivation of plants. [Explanation of symbols]

[0098] 1, 1A, 1B, 1C Latent heat storage material loading 10 Latent heat storage material 20 Buffer material (supercooling prevention agent) 30 Storage material 31S interior space 32a End of the storage member 33 Aperture 40 Sealing part 40A 1st sealing part (sealing part) 40B 2nd sealing part (sealing part) 40U Upper sealing part (sealing part) 40L Lower sealing part (sealing part) VT Vertical direction

Claims

1. A latent heat storage material that stores or releases heat by utilizing the inflow and outflow of latent heat accompanying a phase change is packed into an internal space of a housing member without leaking, The latent heat storage material is loaded into the internal space with a buffer material interposed between the latent heat storage material and an end of the housing member forming the internal space; The buffer material is made of a substance that has no affinity with the latent heat storage material in a liquid phase state; The storage member is formed into a cylindrical body or a bag-shaped body having an opening for filling the latent heat storage material, and the latent heat storage material and the buffer material are loaded into the internal space by welding or bonding in a state in which the opening of the storage member is sealed; the cushioning material is disposed adjacent to a sealing portion of the housing member that is welded or bonded; When the latent heat storage material changes phase from solid to liquid, the buffer absorbs the expansion of the latent heat storage material and deforms the accommodating member at a position avoiding the sealing portion, thereby reducing the stress load on the sealing portion caused by the expansion of the latent heat storage material, thereby preventing damage to the sealing portion and preventing leakage of the latent heat storage material. The latent heat storage material charge is characterized by:

2. The latent heat storage material charge according to claim 1, the cushioning material is disposed to target at least one of the sealing portions; The latent heat storage material charge is characterized by:

3. The latent heat storage material charge according to claim 1, The latent heat storage material is a heat storage material containing at least one of inorganic salt hydrates, inclusion hydrates, and sugar alcohols as a main component; The latent heat storage material charge is characterized by:

4. The latent heat storage material charge according to claim 3, The buffer material is an inorganic salt or an inorganic oxide; The latent heat storage material charge is characterized by:

5. The latent heat storage material charge according to claim 4, The buffer material is a substance that acts as a supercooling prevention agent that promotes the induction of crystallization of the latent heat storage material; The latent heat storage material charge is characterized by:

6. A method for manufacturing a latent heat storage material load, in which a latent heat storage material that stores or releases heat by utilizing the inflow and outflow of latent heat accompanying a phase change is loaded into an internal space of a housing member without leaking, A buffer material having no affinity with the latent heat storage material in a liquid phase is provided, The buffer material is interposed between an end of the housing member forming the internal space and the latent heat storage material filled in the internal space; The storage member is formed into a cylindrical body or a bag-shaped body having an opening for filling the latent heat storage material, and the cushioning material is filled and arranged in a portion of the storage member adjacent to a sealing portion that has been welded or bonded through the opening; After filling the internal space with the buffer material and the latent heat storage material, sealing the opening of the housing member by welding or bonding; When the latent heat storage material changes phase from a solid phase to a liquid phase, the expansion of the latent heat storage material is absorbed by the buffer material, and the housing member is deformed at a position avoiding the sealing portion, thereby reducing the stress load on the sealing portion caused by the expansion of the latent heat storage material, thereby preventing damage to the sealing portion. A method for producing a latent heat storage material load, comprising:

7. The method for producing a latent heat storage material charge according to claim 6, Under a condition in which the latent heat storage material load is placed, the housing member has two sealing portions, one above the other, which are opposed to each other in a vertical positional relationship with respect to a direction along a vertical direction, the cushioning material is disposed at least in a lower sealing portion, which is the lower sealing portion of the two upper and lower sealing portions, and the cushioning material disposed on the lower sealing portion side is a substance having a higher specific gravity than the latent heat storage material; A method for producing a latent heat storage material load, comprising:

8. The method for producing a latent heat storage material charge according to claim 7, the buffer material disposed in the upper sealing portion, which is the sealing portion located on the upper side in the vertical direction, is a material having a specific gravity smaller than that of the latent heat storage material; A method for producing a latent heat storage material load, comprising:

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