JP6704559B1 - Heat transport container and heat transport system - Google Patents

Abstract

The heat transport container stores a heat storage material having a temperature-sensitive polymer that exhibits hydrophilicity and hydrophobicity depending on temperature and water, and heats the heat storage material by exchanging heat with a heating fluid to store heat in the heat storage material. The heat exchanger exchanges heat with the heat-utilizing fluid, absorbs heat from the heat storage material and radiates heat from the heat storage material, and a container filled with the heat storage material and containing the heat exchanger.

Description

TECHNICAL FIELD The present invention relates to a heat transport container and a heat transport system including a heat storage material.

Currently, high temperature exhaust heat of about 500°C or higher generated in heat source facilities such as factories is being promoted to be used for power generation and steam, but use is limited for low temperature exhaust heat of 120°C or lower generated in heat source facilities. Most of them have been discarded due to reasons such as being done. In recent years, with the increase in energy saving and environmental awareness, development of a system that uses low-temperature exhaust heat by supplying the low-temperature exhaust heat to a heat utilization facility such as a hospital or office is under way (see, for example, Patent Document 1). ).

In this system, the heat storage material is heat-exchanged in the heat source facility, the low-temperature exhaust heat generated in the heat source facility is accumulated in the heat storage material by heat exchange, and then the heat storage material is transported to the heat utilization facility and is again heat-exchanged there. The heat of the heat storage material is released to the heat utilization facility.

Japanese Patent No. 5486448

In Patent Document 1, a heat carrier oil is used as the heat exchange means, and a latent heat storage material is used as the heat storage material. The latent heat storage material is, for example, a heat storage material that undergoes a phase change between a solid phase and a liquid phase due to a temperature change, and uses the latent heat absorbed or released to store or release heat. In Patent Document 1, a tank filled with a heat storage material and heat medium oil is used, but the size of the tank and the amount of heat storage are proportional. Further, since a vehicle such as a truck can be considered as a transporting means for the heat storage material, it is necessary to make the tank for storing the heat storage material to be transported as light and compact as possible, but then the heat storage amount is reduced. was there.

The present invention has been made to solve the above problems, and an object thereof is to provide a heat transport container and a heat transport system that can realize weight reduction and size reduction without reducing the amount of heat storage. There is.

The heat transport container according to the present invention heats the heat storage material having a temperature-sensitive polymer that exhibits hydrophilicity and hydrophobicity depending on temperature and water, and heat exchange with a heating fluid to heat the heat storage material. And a heat exchanger that stores heat in the heat storage material, exchanges heat with a heat-utilizing fluid, absorbs heat from the heat storage material and radiates heat from the heat storage material, and the heat storage material is filled, and the heat exchanger is housed. A container, and the temperature-sensitive polymer has a shrinking step of shrinking when the temperature rises and exceeds the lower critical solution temperature, the container, when the heat storage material stores heat in the shrinking step. It has a mechanism for discharging the separated water .

Further, in the heat transport system according to the present invention, the heat transport container is transported to a heat source facility by a transportation means, and after exchanging heat with the heat source facility to store heat in the heat storage material, the heat transport container is transported. It is transported to the heat utilization facility by means and exchanges heat with the heat utilization facility to radiate heat from the heat storage material.

According to the heat-transporting container and the heat-transporting system of the present invention, the heat-transporting container includes a heat storage material having water and a temperature-sensitive polymer that exhibits hydrophilicity and hydrophobicity depending on temperature. When heat is stored in the heat storage material, the temperature-sensitive polymer contracts and separates from water in a liquid state. Therefore, water other than the separated water can be transported after the heat is stored in the heat storage material. In other words, there is no need to transport water after storing heat in the heat storage material, and the amount of heat storage does not decrease even without transporting water, so the heat transport container can be made lighter and more compact without reducing the amount of heat storage. can do.

It is a schematic diagram which shows the heat transport container at the time of transportation after heat storage which concerns on Embodiment 1. FIG. 3 is a schematic diagram showing heat exchange between the heat transport container and the heat source facility according to the first embodiment. FIG. 3 is a schematic diagram showing a heat transport container during transportation after heat dissipation according to the first embodiment. FIG. 5 is a schematic diagram showing heat exchange between the heat transport container and the heat utilization facility according to the first embodiment. It is a schematic diagram which shows the heat transport system which concerns on Embodiment 1.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the embodiments described below. Further, in the following drawings, the size relationship of each component may be different from the actual one.

Embodiment 1.
FIG. 1 is a schematic diagram showing a heat transport container 100 during transportation after heat storage according to the first embodiment. FIG. 2 is a schematic diagram showing heat exchange between the heat transport container 100 and the heat source facility 200 according to the first embodiment. FIG. 3 is a schematic diagram showing the heat transport container 100 during transportation after heat dissipation according to the first embodiment. FIG. 4 is a schematic diagram showing heat exchange between the heat transport container 100 and the heat utilization facility 300 according to the first embodiment. The heat transport container 100 is used to transport the heat storage material to another place by using a transportation means such as a truck or a vehicle. 1 and 3 are schematic diagrams showing a truck 400 as an example of a transportation unit that transports the heat transportation container 100 according to the first embodiment.

(Heat transport container)
As shown in FIGS. 1 to 4, the heat transport container 100 according to the first embodiment includes a container 10, a heat exchanger 20, and a heat storage material 30. The container 10 has, for example, a substantially rectangular parallelepiped shape, is made of SUS (stainless steel), and has a thickness of about 1 mm. A heat storage material 30 is filled inside the container 10. Further, the container 10 houses the heat exchanger 20, and a plurality of openings 11 into which the heating pipes or heat utilization pipes of the heat exchanger 20 (hereinafter simply referred to as pipes 40) are inserted are formed on the side surface. .. Further, the container 10 is formed with an opening 12 for discharging the water separated from the heat storage material 30 after heat storage and an opening 13 for injecting the same amount of water as the water discharged before heat dissipation.

The heat exchanger 20 is, for example, a fin and tube type, and has a pipe 40 and a plurality of fins (not shown). The pipe 40 is, for example, a metal such as SUS or Cu processed into a cylindrical shape or a flat shape, and a heating fluid for heating the heat storage material 30 or a heat utilization fluid for absorbing heat flows therein. The pipe 40 of the heat exchanger 20 housed in the container 10 extends to the outside from the opening 11 formed on the side surface of the container 10 and is provided so as to extend inside and outside the container 10.

Although the opening 11 is formed on the side surface of the container 10 in the first embodiment, the opening 11 may be formed above or below the container 10. When heat is exchanged between the heat transport container 100 and the heat source facility 200 or the heat utilization facility 300 via the external heat exchanger 500, the opening 11 of the container 10 is connected by the pipe 40 to the heating fluid or the heat of the external heat exchanger 500. It may be formed at a position where it can be easily connected to the pipe through which the used fluid flows.

The heat exchanger 20 may have any structure as long as it can heat and radiate the heat storage material 30, and its shape and material can be changed as appropriate. For example, the heat exchanger 20 is not a fin-and-tube type, and the heating fluid or the heat utilizing fluid and the heat storage material 30 may be made to coexist in the same container 10 without being separated by the pipe 40.

The heat storage material 30 has at least a polymer and water, and is, for example, a temperature responsive gel. The polymer is a temperature-responsive polymer that exhibits hydrophilicity and hydrophobicity depending on temperature. The temperature is a lower critical solution temperature (LCST) with respect to water. The polymer exhibits hydrophilicity at a temperature lower than the lower critical solution temperature and exhibits hydrophobicity at a temperature higher than the lower critical solution temperature. A polymer whose properties change greatly at a specific temperature in this way is called a temperature-sensitive polymer, and a gel containing water to form a gel is called a temperature-sensitive polymer gel. The temperature-sensitive polymer gel is made into a gel by mixing the temperature-sensitive polymer and mainly water or a mixed solvent obtained by adding an appropriate amount of an organic solvent to water, and is used as the heat storage material 30.

The temperature-sensitive polymer is not particularly limited as long as the hydrophilicity and the hydrophobicity reversibly change at the lower critical solution temperature as a boundary, and polyvinyl alcohol partial acetic acid, polyvinyl methyl ether. , Methyl cellulose, polyethylene oxide, polyvinyl methyl oxazolidinone, poly N-ethyl acrylamide, poly N-ethyl methacrylamide, poly N-n-propyl acrylamide, poly N-n-propyl methacrylamide, poly N-isopropyl acrylamide, poly N-isopropyl methacrylamide, poly N-cyclopropyl acrylamide, poly N-cyclopropyl methacrylamide, poly N-methyl-N-ethyl acrylamide, poly N,N-diethyl acrylamide, poly N-methyl-N-isopropyl acrylamide, poly N-methyl-Nn-propyl acrylamide, poly N-acryloyl pyrrolidine, poly N-acryloyl piperidine, poly N-2-ethoxyethyl acrylamide, poly N-2-ethoxyethyl methacrylamide, poly N-3-methoxypropyl acrylamide , Poly N-3-methoxypropyl methacrylamide, poly N-3-ethoxypropyl acrylamide, poly N-3-ethoxypropyl methacrylamide, poly N-3-isoproxypropyl acrylamide, poly N-3-isoproxypropyl methacrylamide , Poly N-3-(2-methoxyethoxy)propyl acrylamide, poly N-3-(2-methoxyethoxy)propyl methacrylamide, poly N-tetrahydrofurfuryl acrylamide, poly N-tetrahydrofurfuryl methacrylamide, poly N- 1-methyl-2-methoxyethyl acrylamide, poly N-1-methyl-2-methoxyethyl methacrylamide, poly N-1-methoxymethyl propyl acrylamide, poly N-1-methoxymethyl propyl methacrylamide, poly N-(2 , 2-dimethoxyethyl)-N-methylacrylamide, poly N-(1,3-dioxolan-2-ylmethyl)-N-methylacrylamide, poly N-8-acryloyl-1,4-dioxa-8-aza-spiro [4,5]decane, poly N-2-methoxyethyl-N-ethyl acrylamide, poly N-2-methoxyethyl-Nn-propyl acrylamide, poly N-2-methoxyethyl-N-isopropyl acrylamide, poly N , N-di(2-methoxyethyl) ) Acrylamide can be used.

Further, as another example different from the above, in the heat storage material according to the first example of the first embodiment, the temperature-sensitive polymer has a cross-linked structure and a hydroxyl group, a sulfonic acid group, an oxysulfonic acid at the polymer end. It has one or more functional groups selected from the group consisting of groups, phosphoric acid groups and oxyphosphoric acid groups. It has been found that a thermosensitive polymer gel having an endothermic peak temperature in the range of 30°C to 90°C and a heat storage density of 300 J/g or more can be realized by adjusting the composition and cross-linking structure of these materials. .. In an example of the present disclosure, such a temperature-sensitive polymer gel is used as a heat storage material. In particular, the molar ratio of the repeating unit constituting the temperature-sensitive crosslinked polymer, the functional group, and the crosslinked structural unit is 99:0.5:0.5 to 70:23:7, preferably 98. It is more preferable to use a temperature-sensitive polymer gel having a ratio of 1:1 to 77:18:5 because the heat storage density is 500 J/g or more.

When the proportion of the repeating unit is too large, that is, when the total of the repeating unit, the functional group, and the cross-linking structural unit is 100 mol%, when the proportion of the repeating unit exceeds 99 mol%, The heat storage density decreases. On the other hand, when the ratio of the repeating unit is too small, that is, when the total of the repeating unit, the functional group, and the cross-linking structure unit is 100 mol%, the repeating unit ratio is less than 70 mol%. In some cases, the LCST described below will not be indicated.

The cross-linking structural unit is a structural unit introduced by a cross-linking agent used for producing the temperature-sensitive polymer, and examples of the cross-linking agent include N,N'-methylenebisacrylamide, N,N'- Diallyl acrylamide, N,N'-diacryloylimide, N,N'-dimethacryloylimide, triallyl formal, diallyl naphthalate, ethylene glycol diacrylate, ethylene glycol dimethacrylate, various polyethylene glycol di(meth)acrylates, propylene glycol Diacrylate, propylene glycol dimethacrylate, various polypropylene glycol di(meth)acrylates, 1,3-butylene glycol diacrylate, 1,3-butylene glycol dimethacrylate, 1,4-butylene glycol dimethacrylate, various butylene glycol di(meth ) Crosslinkable monomers such as acrylate, glycerol dimethacrylate, neopentyl glycol dimethacrylate, trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, tetramethylolmethane tetramethacrylate, divinyl derivatives such as divinylbenzene, and the like. However, it is not particularly limited to these.

The heat storage material according to the first example of Embodiment 1 has the following general formula (1).

(In the formula, R ¹ represents a hydrogen atom, a methyl group, an ethyl group, an n-propyl group or an isopropyl group, R ² represents a methyl group, an ethyl group, an n-propyl group or an isopropyl group, and R ¹ and R ² may be the same or different, R ³ represents a hydrogen atom or a methyl group, X represents a covalent bond, or a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphorus group. A structural unit represented by one or more functional groups selected from the group consisting of an acid group and an oxyphosphoric acid group, and * represents a covalent bond, and the following general formula (2)

(In the formula, * represents a covalent bond and q represents an integer of 1 to 3) and a covalent bond of the structural unit represented by the general formula (1). The thermosensitive polymer gel has a crosslinked structure in which a hand and a covalent bond of the constitutional unit represented by the general formula (2) are bonded.

In the heat storage material according to the first example of the first embodiment, a structural unit represented by the general formula (1), X as the functional group, and a structural unit represented by the general formula (2). The molar ratio is 99:0.5:0.5 to 70:23:7, preferably 98:1:1 to 77:18:5. When the proportion of the structural unit represented by the general formula (1) is too large (the structural unit represented by the general formula (1), X as the functional group, and the general formula (2) When the total of the constituent units represented by the general formula (1) exceeds 99 mol% when the total of the constituent units is 100 mol %), the heat storage density becomes small. On the other hand, when the proportion of the structural unit represented by the general formula (1) is too small (the structural unit represented by the general formula (1), the functional group X, and the general formula (2) When the proportion of the structural units represented by the general formula (1) is less than 70 mol% when the total of the structural units represented is 100 mol %), LCST is not exhibited. In the present specification, the molar ratio of the constitutional unit represented by the general formula (1), the functional group X, and the constitutional unit represented by the general formula (2) is determined by charging the raw materials. It is a theoretical value calculated from the amount.

The heat storage material according to the first example of Embodiment 1 includes a structural unit represented by the general formula (1), X that is the functional group, and a structural unit represented by the general formula (2). Is contained in the above molar ratio, and the number of repeating structural units represented by the general formula (1) and the order in which the respective structural units are bonded are not particularly limited. The number of repeating structural units represented by the general formula (1) is usually an integer in the range of 5 to 500.

In the heat storage material according to the first example of the first embodiment, LCST is set within a wide range of 5 to 80° C. mainly depending on the types of R ¹ and R ^{2 in} the general formula (1). be able to. R ¹ in the above general formula (1) is preferably a hydrogen atom or a methyl group from the viewpoint of further improving the temperature responsiveness. R ² in the general formula (1) is preferably an ethyl group, a methyl group or an isopropyl group from the viewpoint of further improving the temperature responsiveness. Further, R ³ in the general formula (1) is preferably a hydrogen atom from the viewpoint of facilitating the production of the temperature-sensitive polymer. X in the general formula (1) is a functional group selected from the group consisting of a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphoric acid group and an oxyphosphoric acid group so as to satisfy the above molar ratio. be able to. Among these functional groups, an oxysulfonic acid group is preferable from the viewpoint of further enhancing radical polymerizability. Q in the general formula (2) is preferably 1 from the viewpoint of further increasing the heat storage density. The covalent bond in the above general formulas (1) and (2) not only binds the same constitutional units to each other or binds different types of constitutional units, but even if a part thereof forms a branched structure. Good. The branched structure is not particularly limited.

The heat storage material according to the first example of Embodiment 1 has the following general formula (5).

(In the formula, R ¹ represents a hydrogen atom, a methyl group, an ethyl group, an n-propyl group or an isopropyl group, R ² represents a methyl group, an ethyl group, an n-propyl group or an isopropyl group, and R ¹ and R ^{2 s} may be the same or different, and R ³ represents a polymerizable monomer represented by the following general formula (6).

(In the formula, q represents an integer of 1 to 3) and one selected from the group consisting of potassium persulfate, sodium persulfate, ammonium persulfate, potassium perphosphate and hydrogen peroxide. It can be produced by radical polymerization in the presence of the above polymerization initiator.

Specific examples of the polymerizable monomer represented by the general formula (5) (polymerizable monomer giving the constitutional unit represented by the general formula (1)) include, for example, N-ethyl(meth)acrylamide, N- n-propyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N-cyclopropyl(meth)acrylamide, N,N-dimethyl(meth)acrylamide, N-ethyl-N-methyl(meth)acrylamide, N-methyl -N-n-propyl(meth)acrylamide, N-isopropyl-N-methyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-ethoxyethyl(meth)acrylamide, N-ethyl-N-methoxyethyl (Meth)acrylamide, N-methoxypropyl(meth)acrylamide, N-ethoxypropyl(meth)acrylamide, N-isopropoxypropyl(meth)acrylamide, N-methoxyethoxypropyl(meth)acrylamide, N-1-methyl-2 -Methoxyethyl (meth)acrylamide, N-1-methoxymethylpropyl (meth)acrylamide, N-(2,2-dimethoxyethyl)-N-methyl (meth)acrylamide, N,N-dimethoxyethyl (meth)acrylamide, etc. Is mentioned. Among these, N-alkyl (having 1 to 3 carbon atoms) (meth)acrylamide is preferable, and N-isopropyl (meth)acrylamide is more preferable. In addition, in this specification, "(meth)acryl" means methacryl or acryl.

Specific examples of the cross-linking agent represented by the general formula (6) (cross-linking agent giving the constitutional unit represented by the general formula (2)) include N,N'-methylenebisacrylamide, N,N'-. Mention may be made of ethylene bisacrylamide and N,N'-(trimethylene)bisacrylamide.

The radical polymerization method is not particularly limited, and known methods such as a bulk polymerization method, a solution polymerization method and an emulsion polymerization method can be used. Among the above-mentioned polymerization initiators, potassium persulfate and ammonium persulfate are preferable from the viewpoint of good reactivity. Further, by using a polymerization accelerator such as N,N,N′,N′-tetramethylethylenediamine or N,N-dimethylparatoluidine in combination with the above-mentioned polymerization initiator, rapid radical polymerization at low temperature can be achieved. It will be possible.

The solvent used for radical polymerization is not particularly limited, and water, methanol, ethanol, n-propanol, isopropanol, 1-butanol, isobutanol, hexanol, benzene, toluene, xylene, chlorobenzene, dichloromethane, chloroform, Carbon tetrachloride, acetone, methyl ethyl ketone, tetrahydrofuran, dioxane, acetonitrile, dimethyl sulfoxide, N,N-dimethylformamide, N,N-dimethylacetamide and the like can be mentioned. Among these solvents, water is preferable from the viewpoint of increasing the heat storage density. The radical polymerization reaction may usually be performed at a temperature of 0°C to 100°C for 30 minutes to 24 hours.

When radical polymerization is carried out using water as a solvent, the total concentration of the polymerizable monomer represented by the general formula (5), the crosslinking agent represented by the general formula (6), and the polymerization initiator is 2 mol/L to 3 mol/L is particularly preferable from the viewpoint of further increasing the animal heat density. If the total concentration is less than 2 mol/L, the heat storage density of the obtained heat storage material may decrease. On the other hand, if the total concentration exceeds 3 mol/L, the heat storage material obtained may not exhibit LCST.

The reason why the heat storage material according to the first example of the first embodiment can achieve a relatively low heat storage operating temperature (100° C. or less) and a high heat storage density is not clear, but is considered as follows. The temperature-sensitive polymer having LCST exhibits hydrophilicity at a temperature lower than LCST and exhibits hydrophobicity at a temperature higher than LCST. Since the temperature-sensitive polymer that constitutes the heat storage material according to the first example of the first embodiment has a high crosslink density and a highly dense structure in which the ends of the polymer are branched, it becomes a temperature-sensitive polymer. The adsorbed water of is highly aligned like the conventional temperature-sensitive polymer, but is less aligned at a higher temperature than LCST. In the temperature-sensitive polymer that constitutes the heat storage material according to the first example of the first embodiment, this array property changes greatly, so that it only shows a low heat storage operation temperature as in the conventional temperature-sensitive polymer. Therefore, it is considered that a large heat storage density can be achieved.

According to the first example of the first embodiment, it is possible to provide a heat storage material having a relatively low heat storage operating temperature and a large heat storage density, and a method for manufacturing the same. The heat storage material according to the first example of the first embodiment has a relatively low heat storage operation temperature and a large heat storage density, so that the heat transport container 100 filled with the heat storage material can be downsized, and Suitable for transportation systems.

The heat storage material according to the second example of Embodiment 1 has the following general formula (1).

(In the formula, R ¹ represents a hydrogen atom, a methyl group, an ethyl group, an n-propyl group or an isopropyl group, R ² represents a methyl group, an ethyl group, an n-propyl group or an isopropyl group, and R ¹ and R ² may be the same or different, R ³ represents a hydrogen atom or a methyl group, X represents a covalent bond, or a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphorus group. A structural unit represented by one or more functional groups selected from the group consisting of an acid group and an oxyphosphoric acid group, and * represents a covalent bond, and the following general formula (2)

(In the formula, * represents a covalent bond and q represents an integer of 1 to 3), and a general formula (3) below.

Or the following general formula (4)

(In the formula, R ⁴ represents a hydroxy group, a carboxyl group, a sulfonic acid group or a phosphoric acid group, R ⁵ represents a hydrogen atom or a methyl group, X represents a covalent bond, or a hydroxy group or a sulfone group. An acid group, an oxysulfonic acid group, a phosphoric acid group, and one or more functional groups selected from the group consisting of an oxyphosphoric acid group, * represents a covalent bond, and p represents an integer of 1 to 3) And a covalent bond of the structural unit represented by the general formula (1), a covalent bond of the structural unit represented by the general formula (2), and the general formula (3). Or a thermosensitive polymer gel having a crosslinked structure in which a covalent bond of the structural unit represented by the general formula (4) is bonded.

In the heat storage material according to the second example of the first embodiment, the mole of the constitutional unit represented by the general formula (1) and the constitutional unit represented by the general formula (3) or the general formula (4). The ratio is 95:5 to 20:80, preferably 85:15 to 25:75. When the ratio of the constitutional unit represented by the general formula (1) is too large (the constitutional unit represented by the general formula (1) and the constitution represented by the general formula (3) or the general formula (4)) When the proportion of the constituent units represented by the general formula (1) exceeds 95 mol% when the total of the units and the unit is 100 mol %), the heat storage density becomes small. On the other hand, when the ratio of the structural unit represented by the general formula (1) is too small (the structural unit represented by the general formula (1) and the general formula (3) or the general formula (4) In the case where the ratio of the structural unit represented by the general formula (1) is less than 20 mol% when the total of the structural unit and the structural unit is 100 mol %), LCST is not exhibited.

In the heat storage material according to the second example of the first embodiment, the total of the structural unit represented by the general formula (1) and the structural unit represented by the general formula (3) or the general formula (4) and The molar ratio of X, which is the functional group, to the structural unit represented by the general formula (2) is 99:0.5:0.5 to 70:23:7, preferably 98:1. : 1 to 77:18:5. When the proportion of the structural unit represented by the general formula (1) and the structural unit represented by the general formula (3) or the general formula (4) is too large (the configuration represented by the general formula (1) The total of the units and the structural units represented by the general formula (3) or the general formula (4), X as the functional group, and the structural unit represented by the general formula (2) is 100. When the total proportion of the constitutional unit represented by the above general formula (1) and the constitutional unit represented by the above general formula (3) or the above general formula (4) is more than 99 mol% when it is defined as mol %) , The heat storage density becomes smaller. On the other hand, when the ratio of the structural unit represented by the general formula (1) and the structural unit represented by the general formula (3) or the general formula (4) is too small (represented by the general formula (1) Of the structural units represented by the general formula (3) or the general formula (4), the functional group X, and the structural unit represented by the general formula (2). Is 100 mol%, the total proportion of the structural unit represented by the general formula (1) and the structural unit represented by the general formula (3) or the general formula (4) is less than 70 mol%. In some cases), no LCST is shown. In addition, in the present specification, the total of the structural unit represented by the general formula (1) and the structural unit represented by the general formula (3) or the general formula (4), and X as the functional group. The molar ratio with the constitutional unit represented by the general formula (2) is a theoretical value calculated from the charged amount of the raw materials.

The heat storage material according to the second example of Embodiment 1 is a structural unit represented by the general formula (1), a structural unit represented by the general formula (3) or the general formula (4), It suffices that X, which is the functional group, and the structural unit represented by the general formula (2) are contained in the above molar ratio, and the structural unit represented by the general formula (1) and the general formula (3). Or the number of repeating structural units represented by the above general formula (4) and the order in which the respective structural units are bonded are not particularly limited. The repeating number of the structural unit represented by the general formula (1) and the structural unit represented by the general formula (3) or the general formula (4) is usually an integer in the range of 5 to 500.

In the heat storage material according to the second example of Embodiment 1, LCST is mainly represented by the structural unit represented by the general formula (1) and the general formula (3) or the general formula (4). ⁵ depending on the molar ratio with the structural unit and the types of R ¹ and R ^{2 in} the general formula (1), and the types of R ⁴ and R ^{5 in} the general formula (3) or the general formula (4). It can be set in a wide range of -80°C. R ¹ in the above general formula (1) is preferably a hydrogen atom or a methyl group from the viewpoint of further improving the temperature responsiveness. R ² in the general formula (1) is preferably an ethyl group, a methyl group or an isopropyl group from the viewpoint of further improving the temperature responsiveness. Further, R ³ in the general formula (1) and R ⁵ in the general formula (3) or the general formula (4) are each a hydrogen atom from the viewpoint of facilitating the production of the temperature-sensitive polymer. Preferably. X in the general formulas (1), (3) and (4) is a group consisting of a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphoric acid group and an oxyphosphoric acid group so as to satisfy the above molar ratio. Can be a functional group selected from Among these functional groups, an oxysulfonic acid group is preferable from the viewpoint of further enhancing radical polymerizability. R ⁴ in the general formulas (3) and (4) is preferably a hydroxy group or a sulfonic acid group from the viewpoint of further increasing the heat storage density. In the general formulas (3) and (4), p is preferably 1 or 2 from the viewpoint of further increasing the heat storage density. Q in the general formula (2) is preferably 1 from the viewpoint of further increasing the heat storage density. The covalent bond in the above general formulas (1) to (4) not only binds the same constitutional units to each other or binds different types of constitutional units, but also forms a branched structure in part. Good. The branched structure is not particularly limited.

The heat storage material according to the second example of Embodiment 1 has the following general formula (5).

(In the formula, R ¹ represents a hydrogen atom, a methyl group, an ethyl group, an n-propyl group or an isopropyl group, R ² represents a methyl group, an ethyl group, an n-propyl group or an isopropyl group, and R ¹ and R ² may be the same or different, and R ³ represents a hydrogen atom or a methyl group) and a polymerizable monomer represented by the following general formula (7).

Or the following general formula (8)

(In the formula, R ⁴ represents a hydroxy group, a carboxyl group, a sulfonic acid group or a phosphoric acid group, R ⁵ represents a hydrogen atom or a methyl group, and p represents an integer of 1 to 3) With a polymerizable monomer represented by the following general formula (6)

(In the formula, q represents an integer of 1 to 3) and one selected from the group consisting of potassium persulfate, sodium persulfate, ammonium persulfate, potassium perphosphate and hydrogen peroxide. It can be produced by radical polymerization in the presence of the above polymerization initiator.

The polymerizable monomer represented by the general formula (5), the crosslinking agent represented by the general formula (6), and the polymerization initiator are the same as those described in the first example of the first embodiment. Therefore, the description is omitted. Further, the radical polymerization method, the radical polymerization conditions, and the like are the same as those described in the first example of the first embodiment, and thus the description thereof will be omitted.

Specific examples of the polymerizable monomer represented by the general formula (7) (polymerizable monomer giving the structural unit represented by the general formula (3)) include, for example, 2-hydroxymethyl acrylate and acrylic acid 2 -Hydroxyethyl, 2-hydroxypropyl acrylate, 2-carboxymethyl acrylate, 2-carboxyethyl acrylate, 2-carboxypropyl acrylate, 2-sulfomethyl acrylate, 2-sulfoethyl acrylate, 2-sulfopropyl acrylate , 2-phosphomethyl acrylate, 2-phosphoethyl acrylate, 2-phosphopropyl acrylate and the like. Among these, 2-hydroxymethyl acrylate, 2-hydroxyethyl acrylate and 2-hydroxypropyl acrylate are preferable.

Specific examples of the polymerizable monomer represented by the general formula (8) (polymerizable monomer giving the constitutional unit represented by the general formula (4)) include, for example, N-(1,1-dimethyl-2). -Hydroxyethyl)acrylamide, N-(1,1-dimethyl-2-hydroxypropyl)acrylamide, N-(1,1-dimethyl-2-hydroxybutyl)acrylamide, 2-acrylamido-2-methylpropanecarboxylic acid, 2 -Acrylamido-2-methylbutanecarboxylic acid, 2-acrylamido-2-methylpentanecarboxylic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-acrylamido-2-methylbutanesulfonic acid, 2-acrylamido-2-methyl Pentanesulfonic acid, 2-acrylamido-2-methylpropanephosphoric acid, 2-acrylamido-2-methylbutanephosphoric acid, 2-acrylamido-2-methylpentanephosphoric acid and the like can be mentioned. Among these, 2-acrylamido-2-methylpropanesulfonic acid and 2-acrylamido-2-methylpentanesulfonic acid are preferable.

Similar to the first example of the first embodiment, when radical polymerization is performed using water as a solvent, the polymerizable monomer represented by the general formula (5) and the general formula (7) or the general formula ( The total concentration of the polymerizable monomer represented by 8), the cross-linking agent represented by the general formula (6), and the polymerization initiator is preferably 2 mol/L to 3 mol/L. If the total concentration is less than 2 mol/L, the heat storage density of the obtained heat storage material may decrease. On the other hand, if the total concentration exceeds 3 mol/L, the heat storage material obtained may not exhibit LCST.

The water content of the heat storage material according to the first example and the second example of the first embodiment is not particularly limited, but is preferably 70% to 99% by mass. Regarding the water content, after measuring the weight of the animal heat-containing material containing water at room temperature, it was put in a constant temperature bath to evaporate the water at a drying temperature of 60 to 120° C., and the water was lost (the weight did not decrease). By the way, the weight of the heat storage material can be measured, and the weight loss can be obtained by assuming the water content (drying weight loss method). Moreover, you may make the heat storage material which concerns on the 1st example and 2nd example of Embodiment 1 porous. By making the heat storage material porous, there is an advantage that the temperature response is further enhanced. The method for making the heat storage material porous is to prepare a mixed solution containing the above-mentioned polymerizable monomer, crosslinking agent, polymerization initiator and porogen (pore forming agent), form a crosslinked structure by radical polymerization reaction, and then wash. The method of removing a porogen is mentioned. When the radical polymerization reaction is carried out using water as a solvent, preferred porogens are water-soluble carbohydrates such as sucrose, maltose, cellobiose, lactose, sorbitol, xylitol, glucose and fructose. A porogen composition containing these water-soluble carbohydrates and polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol, or a mixture thereof may be used. Another method of making the heat storage material porous is a method of removing water from the temperature-sensitive polymer containing water by freeze-drying.

Further, the temperature-sensitive polymer according to the first example and the second example of the first embodiment, the mixed solution containing at least the polymerizable monomer, the cross-linking agent and the polymerization initiator described above, the metal in the heat radiation pipe It can also be produced by coating on the surface (for example, stainless steel, copper, aluminum, etc.) and radical polymerization. The mixed solution may contain a metal surface activator, a coupling agent, and the like. Further, the temperature-sensitive polymer according to the first example and the second example of the first embodiment can also be manufactured by irradiating the coating film of the above-mentioned mixed solution with radiation.

[Examples 1 to 5 and Comparative Examples 1 to 5]
The raw material aqueous solution having the composition shown in Table 1 was heated from room temperature to 50° C. over 1 hour under a nitrogen atmosphere to obtain a temperature-sensitive polymer. This was dried, equilibrated and swollen with distilled water to obtain a temperature-sensitive polymer gel, which was then enclosed in an aluminum closed container and the endothermic peak temperature and the heat storage density were measured by a differential scanning calorimeter. The results are shown in Table 2.

The abbreviations in Table 1 are as follows.
NIPAM: N-isopropylacrylamide HMA: 2-hydroxyethyl acrylate MBA: N,N'-methylenebisacrylamide KPS: potassium persulfate TEMED: N,N,N',N'-tetramethylethylenediamine

As can be seen from the results in Table 2, the temperature-sensitive polymer gels obtained in Examples 1 to 5 have low endothermic peak temperatures of 36° C. to 77° C. and heat storage densities of 512 J/g to 844 J/g. It was great. That is, the temperature-sensitive polymer gels obtained in Examples 1 to 5 can exhibit a high heat storage density of 512 J/g to 844 J/g at a low heat storage operating temperature of 36°C to 77°C. Further, in the reversible change of hydrophilicity and hydrophobicity of the temperature-sensitive polymer gel in which the heat storage operation temperature was exhibited, the water temperature was 36° C. to 77° C. and it was in a liquid state. On the other hand, although the temperature-sensitive polymer gels obtained in Comparative Examples 1 to 5 have low endothermic peak temperatures of 32° C. to 68° C., like the conventional heat storage materials such as paraffin, fatty acid, sugar alcohol, etc., The heat storage density was remarkably small at 31 J/g to 42 J/g.

The water is preferably pure water, but need not be pure water as long as it does not contain a component that may deteriorate the polymer. Water is divided into bound water bound to a high-density crosslinked polymer and free water excluding bound water. Since the polymer has a hydrophilic swelling structure at a temperature lower than the lower critical solution temperature, it forms a highly aligned structure in which bound water is stable and enhances the hydrogen bonding force. On the other hand, the polymer has a hydrophobic contraction structure at a temperature higher than the lower critical solution temperature, so that water-bonded water forms a low-alignment structure in which water is unstable and weakens the hydrogen bonding force. That is, the heat storage material 30 can improve or reduce the hydrogen bonding force of the bound water before and after the lower critical solution temperature. Thus, the heat storage material 30 can change the hydrogen bonding force of the bound water before and after the lower critical solution temperature, and thus has a high heat storage amount corresponding to the change of the hydrogen bonding force. Since the heat storage material 30 has a high heat storage amount, the filling amount of the heat storage material 30 filled in the container 10 can be reduced. Therefore, the heat transport container 100 can be reduced in weight and size.

The organic solvent added to water as a mixed solvent is selected from polar organic solvents, and preferably alcohols such as methanol, ethanol, propanol, isopropanol, isopentanol and 2-methoxyethanol, acetone, methyl ethyl ketone, methyl n-. Ketones such as propyl ketone, methyl isopropyl ketone and methyl isoamyl ketone, ethers such as ethylene glycol monobutyl ether and propylene glycol monomethyl ether, methyl acetate, ethyl acetate, propyl acetate, n-butyl acetate, chloroform, acetonitrile, glycerol, dimethyl sulfoxide, It is selected from the group consisting of N,N-dimethylformamide, tetrahydrofuran, pyridine, 1,4-dioxane, dimethylacetamide, N-methylpyrrolidone, propylene carbonate and mixtures thereof. A polar organic solvent having a high solubility in water is suitable.

(Heat transport operation of heat transport container)
Next, the operation of the heat transport container 100 will be described. First, the heat storage operation of the heat transport container 100 shown in FIG. 2 will be described. The heat storage operation of the heat transport container 100 is performed via the external heat exchanger 500 in the heat source facility 200 after the heat transport container 100 is transported to the heat source facility 200 by a transportation means such as a truck 400 as shown in FIG. 1. .. When the heating fluid flows through the pipe 40, the heat of the heating fluid is transferred to the heat storage material 30 via the pipe 40, and the temperature of the heat storage material 30 rises. The polymer contained in the heat storage material 30 contracts when the temperature rises and exceeds the lower critical solution temperature. This is called a shrinking process. In the shrinking step, the bound water of water is reduced in order to reduce the hydrogen bonding force. As a result, the heat storage material 30 absorbs the hydrogen bond energy corresponding to the decrease in the hydrogen bond strength. That is, the polymer has a contraction step, and the heat absorption energy due to the low arrangement of the bound water of water is stored in the heat storage material 30 in the contraction step. Water is in a liquid state in the shrinking step. After that, the heating fluid flows out of the container 10 after the temperature thereof drops.

(Heat radiation operation of heat transport container)
Next, the heat dissipation operation of the heat transport container 100 shown in FIG. 4 will be described. As shown in FIG. 3, the heat radiating operation of the heat transport container 100 is performed through the external heat exchanger 500 in the heat utilization facility 300 after the heat transport container 100 is transported to the heat utilization facility 300 by a transportation means such as a truck 400. Done. When the heat utilization fluid flows through the pipe 40, the heat of the heat storage material 30 is transferred to the heat utilization fluid via the pipe 40, and the temperature of the heat storage material 30 decreases. The polymer contained in the heat storage material 30 swells when the temperature drops and falls below the lower critical solution temperature. This is called a swelling step. In the swelling step, the bound water of water is highly aligned and the hydrogen bonding force is increased. The heat storage material 30 generates hydrogen bond energy corresponding to an increase in the hydrogen bond force. That is, the polymer has a swelling step, and the heat generation energy due to the higher arrangement of the bound water of water is radiated from the heat storage material 30 in the swelling step. Water is in a liquid state in the swelling step. Thereafter, the temperature of the heat utilization fluid rises and then flows out of the container 10.

As described above, the heat storage container 30 stores and dissipates heat in the heat storage material 30 in the container 10 by the polymer shrinking step and the polymer swelling step. In the contracting step and the swelling step, water is in a liquid state, and the heat transport container 100 does not require the evaporation step and the condensation step of water. Therefore, it is not necessary to provide a condensing section for condensing and liquefying steam and a water transport path through which liquefied hot water flows outside the container 10. Therefore, the heat transport container 100 can be reduced in weight and size. Further, the heat storage material 30 has a high heat storage amount corresponding to the change of the hydrogen bonding force by changing the level of the hydrogen bonding force of the bound water of water. Therefore, since the filling amount of the heat storage material 30 can be reduced, the heat transport container 100 can be reduced in weight and size.

It should be noted that in the container 10, a sheet or a film in which a plurality of openings having a size through which a polymer does not pass may be formed may be provided in layers. As a result, it is possible to prevent the polymer from moving upward or downward in the container 10 due to the difference in specific gravity with water, and further it is easy to discharge the separated water after heat storage from the heat transport container 100. ..

FIG. 5 is a schematic diagram showing the heat transport system according to the first embodiment.
In the heat transport system according to the first embodiment, first, the heat transport container 100 is transported to the heat source facility 200 by a transport means such as a truck 400. When transported to the heat source facility 200, the heat transport container 100 is connected to the external heat exchanger 500 so that heat can be exchanged with the heat source facility 200. Then, the heat transport container 100 and the heat source facility 200 exchange heat via the external heat exchanger 500 to store heat in the heat storage material 30. After the heat is stored in the heat storage material 30, the water separated from the heat storage material 30 is discharged from the opening 12 of the container 10 of the heat transport container 100.

After that, the heat transport container 100 is transported to the heat utilization facility 300 by a transportation means such as a truck 400. When transported to the heat utilization facility 300, the heat transport container 100 is connected to the external heat exchanger 500 so that heat can be exchanged with the heat utilization facility 300. Then, the heat transport container 100 and the heat utilization facility 300 exchange heat via the external heat exchanger 500 to radiate heat from the heat storage material 30.

After that, the heat transport container 100 is transported to the heat source facility 200 again by the transport means such as the truck 400. Then, the heat transport system repeats the above cycle.

As described above, in the heat transport system, after the heat is stored in the heat storage material 30, the water separated from the heat storage material 30 is discharged from the opening 12 of the container 10, whereby the heat transport container 100 can be made lightweight and compact. Therefore, the transportation cost can be reduced.

As described above, the heat transport container 100 according to the first embodiment exchanges heat with the heat storage material 30 having the temperature-sensitive polymer that exhibits hydrophilicity and hydrophobicity depending on the temperature and water, and the heating fluid. A heat exchanger 20 that heats the heat storage material 30 to cause the heat storage material 30 to store heat, and that exchanges heat with a heat-utilizing fluid to absorb heat from the heat storage material 30 and radiate heat from the heat storage material 30, and the heat storage material 30 are filled, The container 10 in which the exchanger 20 is accommodated is provided.

According to the heat transport container 100 according to the first embodiment, the heat transport container 100 includes the heat storage material 30 including the temperature-sensitive polymer that exhibits hydrophilicity and hydrophobicity depending on temperature and water. .. Then, when heat is stored in the heat storage material 30, the temperature-sensitive polymer contracts and separates from liquid water. Therefore, water other than the separated water can be transported after the heat storage material 30 stores heat. That is, it is not necessary to transport water after the heat is stored in the heat storage material 30, and the heat storage amount does not decrease even if the water is not transported. Therefore, the heat transport container 100 can be made lightweight and compact without reducing the heat storage amount. Can be realized.

Further, it is desirable that the heat transport container 100 is not filled with the heat carrier oil. If the heat transport container 100 does not contain heat carrier oil that separates from water, even if an accident or the like occurs during transport of the heat carrier container 100, a large amount of heat carrier oil leaks and burns or explodes. Or, the situation of polluting the environment can be prevented.

Further, in the heat transport container 100 according to the first embodiment, the temperature-sensitive polymer contracts when the temperature rises and exceeds the lower critical solution temperature, and the temperature decreases and falls below the lower critical solution temperature. And the swelling step of swelling, the heat storage material 30 stores heat in the shrinking step and radiates heat in the swelling step.

According to the heat transport container 100 according to the first embodiment, the heat storage material 30 stores and dissipates heat inside the container 10 by the shrinking process and the swelling process of the temperature-sensitive polymer. In the contracting step and the swelling step, water is in a liquid state, and the heat transport container 100 does not require the evaporation step and the condensation step of water. Therefore, it is not necessary to provide a condensing section for condensing and liquefying steam and a water transport path through which liquefied hot water flows outside the container 10. Therefore, the heat transport container 100 can be reduced in weight and size.

Further, in the heat transport container 100 according to the first embodiment, the container 10 has the opening 12 which is a mechanism for discharging the water separated when the heat storage material 30 stores heat in the shrinking step.

According to the heat transport container 100 according to the first embodiment, water that is separated when the heat storage material 30 stores heat in the shrinking process can be discharged from the opening 12 of the container 10, and when the heat transport container 100 is transported. Since it is possible to reduce the weight and the size of the vehicle, it is possible to reduce the transportation cost.

Further, in the heat transport system according to the first embodiment, the heat transport container 100 is transported to the heat source facility 200 by a transportation means, and after exchanging heat with the heat source facility 200 to store heat in the heat storage material 30, the heat transport container 100 is stored. The transportation means transports the heat to the heat utilization facility 300, exchanges heat with the heat utilization facility 300, and radiates heat from the heat storage material 30.

According to the heat transport system according to the first embodiment, the same effect as that of the heat transport container 100 described above can be obtained.

Embodiment 2.
Hereinafter, the second embodiment will be described, but the description of the same parts as those of the first embodiment will be omitted, and the same parts or corresponding parts as those of the first embodiment will be denoted by the same reference numerals.

In the first embodiment, the heat transport container 100 is loaded as a heat transport container on a transportation means such as a truck 400 and transported. At this time, the water separated from the heat storage material 30 after heat storage is transferred from the heat transport container 100. Discharge. By doing so, the heat-transporting container 100 is made lighter, the weight of the transportation is reduced and the heat-transporting container 100 is made compact, and the transportation cost is reduced.

However, without transporting the heat transport container 100 itself, the heat storage material 30 excluding water separated from the heat storage material 30 after heat storage is taken out of the container 10 and filled in another container that can be sealed, and the other container is transported. You may load and transport it. In this case, in the heat utilization facility 300, a heat storage device for heat dissipation including a container and a heat exchanger is prepared, and the same amount of separated water and the transported heat storage material 30 are used for heat storage for heat dissipation. Fill the container of the device and let it radiate heat. As a result, the transportation weight can be further reduced, and the transportation cost can be significantly reduced. Further, it becomes possible to transport heat to a plurality of heat utilization facilities 300.

As described above, in the heat transport system according to the second embodiment, after transporting the heat transport container 100 to the heat source facility 200 by the transport means and exchanging heat with the heat source facility 200 to store heat in the heat storage material 30, the opening 12 of the container 10 is opened. From the heat storage material 30, the water is discharged from the heat storage material 30, the heat storage material 30 is taken out from the container 10 and filled in another container that can be sealed, and the another container is transported to the heat utilization facility 300 by the transportation means. To exchange heat with the heat storage material 30 to radiate heat.

According to the heat transport system according to the second embodiment, the transport weight can be further reduced, so that the transport cost can be significantly reduced.

10 containers, 11 openings, 12 openings, 13 openings, 20 heat exchangers, 30 heat storage materials, 40 piping, 100 heat transport containers, 200 heat source facilities, 300 heat utilization facilities, 400 trucks, 500 external heat exchangers.

Claims (9)

A heat storage material having a temperature-sensitive polymer showing hydrophilicity and hydrophobicity depending on temperature and water,
A heat exchanger for exchanging heat with the heating fluid to heat the heat storage material to store heat in the heat storage material, and to exchange heat with the heat-utilizing fluid to absorb heat from the heat storage material and radiate heat from the heat storage material,
A container filled with the heat storage material and containing the heat exchanger ,
The temperature-sensitive polymer has a shrinking step of shrinking when the temperature rises and exceeds the lower critical solution temperature,
The container is a heat transport container having a mechanism for discharging water separated when the heat storage material stores heat in the shrinking step . Said temperature-sensitive polymer, and a swelling step of temperature swells falls below the lower critical solution temperature decreases,
The heat transport container according to claim 1, wherein the heat storage material stores heat in the shrinking step and radiates heat in the swelling step. The heat storage material,
The temperature-sensitive polymer has a cross-linked structure and also has at least one functional group selected from the group consisting of a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphoric acid group and an oxyphosphoric acid group at the molecular end. However, since the temperature-sensitive polymer has water, the endothermic peak temperature is in the range of 30° C. to 90° C., and the heat storage density is 300 J/g or more. Item 3. The heat transport container according to Item 1 or 2 . The heat storage material,
The temperature-sensitive polymer has a cross-linked structure and also has at least one functional group selected from the group consisting of a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphoric acid group and an oxyphosphoric acid group at the molecular end. The molar ratio of the repeating unit constituting the temperature-sensitive polymer, the functional group, and the cross-linking structural unit is 99:0.5:0.5 to 70:20:10. Or the heat transport container according to 2. The heat storage material,
The following general formula (1)

(In the formula, R ¹ represents a hydrogen atom, a methyl group, an ethyl group, an n-propyl group or an isopropyl group, R ² represents a methyl group, an ethyl group, an n-propyl group or an isopropyl group, and R ¹ and R ² may be the same or different, R ³ represents a hydrogen atom or a methyl group, X represents a covalent bond, or a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphorus group. A structural unit represented by one or more functional groups selected from the group consisting of an acid group and an oxyphosphoric acid group, and * represents a covalent bond),
The following general formula (2)

(In the formula, * represents a covalent bond, and q represents an integer of 1 to 3).
A covalent bond of the structural unit represented by the general formula (1) and a covalent bond of the structural unit represented by the general formula (2) have a cross-linked structure,
The molar ratio of the structural unit represented by the general formula (1), the functional group X, and the structural unit represented by the general formula (2) is 99:0.5:0.5 to. The heat-transporting container according to claim 1 or 2 , which is a temperature-sensitive polymer gel having a ratio of 70:20:7. The heat storage material,
The following general formula (1)

(In the formula, R ¹ represents a hydrogen atom, a methyl group, an ethyl group, an n-propyl group or an isopropyl group, R ² represents a methyl group, an ethyl group, an n-propyl group or an isopropyl group, and R ¹ and R ² may be the same or different, R ³ represents a hydrogen atom or a methyl group, X represents a covalent bond, or a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphorus group. A structural unit represented by one or more functional groups selected from the group consisting of an acid group and an oxyphosphoric acid group, and * represents a covalent bond),
The following general formula (2)

(In the formula, * represents a covalent bond, and q represents an integer of 1 to 3),
The following general formula (3)

Or the following general formula (4)

(In the formula, R ⁴ represents a hydroxy group, a carboxyl group, a sulfonic acid group or a phosphoric acid group, R ⁵ represents a hydrogen atom or a methyl group, X represents a covalent bond, or a hydroxy group or a sulfone group. An acid group, an oxysulfonic acid group, a phosphoric acid group, and one or more functional groups selected from the group consisting of an oxyphosphoric acid group, * represents a covalent bond, and p represents an integer of 1 to 3) Including the structural unit represented by
The covalent bond of the structural unit represented by the general formula (1), the covalent bond of the structural unit represented by the general formula (2), and the covalent bond represented by the general formula (3) or the general formula (4). Has a crosslinked structure in which a covalent bond of a constituent unit is bound,
The molar ratio of the structural unit represented by the general formula (1) to the structural unit represented by the general formula (3) or the general formula (4) is 95:5 to 20:80,
The total of the structural unit represented by the general formula (1) and the structural unit represented by the general formula (3) or the general formula (4), X as the functional group, and the general formula (2). The heat-transporting container according to claim 1 or 2 , which is a temperature-sensitive polymer gel having a molar ratio of 99:0.5:0.5 to 70:23:7 with the structural unit represented by. The heat transport container according to any one of claims 1 to 7 is transported to a heat source facility by a transporting means, heat-exchanged with the heat source facility to store heat in the heat storage material, and then the heat transport container is transported. A heat transport system that transports the heat to the heat utilization facility by means and exchanges heat with the heat utilization facility to radiate heat from the heat storage material. After storing heat in the heat storage material of the heat transport container, the water separated from the heat storage material is discharged from the mechanism of the container, and then the heat transport container is transported to the heat utilization facility by the transport means. The heat transport system according to claim 7 . After the heat source facilities and transport, said by the heat source facilities and heat exchanger is accumulated in the heat storage material by means of transport the heat transport container according to any one of claims 1 to 6, from the mechanism of the container, The water separated from the heat storage material is discharged, the heat storage material is taken out of the container and filled in another container that can be sealed, and the another container is transported to a heat utilization facility by the transportation means, and the heat utilization facility and A heat transport system that is exchanged to radiate heat from the heat storage material.

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