JPWO2021064993A1 - Heat transport container and heat transport system - Google Patents

Abstract

The heat transport container has a heat storage material having a temperature-sensitive polymer and water that show hydrophilicity and hydrophobicity depending on the temperature, and heat exchanges with the heating fluid to heat the heat storage material and store heat in the heat storage material. It is provided with a heat exchanger that exchanges heat with a heat-utilizing fluid to absorb heat from the heat storage material and dissipate heat from the heat storage material, and a container filled with the heat storage material and accommodating the heat exchanger.

Description

The present invention relates to a heat transport container and a heat transport system provided with a heat storage material.

Currently, the use of high-temperature waste heat of about 500 ° C or higher generated in heat source facilities such as factories for power generation and steam is being promoted, but the use of low-temperature waste heat of about 120 ° C or lower generated in heat source facilities is limited. Most of them have been discarded for reasons such as being slaughtered. In recent years, due to energy saving and heightened environmental awareness, development of a system that utilizes low-temperature waste heat by supplying low-temperature waste heat to heat utilization facilities such as hospitals or offices has been promoted (see, for example, Patent Document 1). ).

In this system, the heat storage material is heat-exchanged at the heat source facility, the low-temperature waste heat generated at the heat source facility is stored in the heat storage material by heat exchange, and then the heat storage material is transported to the heat utilization facility and heat is exchanged again 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 medium oil is used as a means for heat exchange, and a latent heat storage material is used as a 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 stores or dissipates heat by utilizing the latent heat absorbed or released at that time. In Patent Document 1, a tank filled with a heat storage material and heat medium oil is used, but the size of the tank is proportional to the amount of heat storage. In addition, since a vehicle such as a truck can be considered as a means of transporting the heat storage material, it is necessary to make the tank for accommodating the heat storage material to be transported as light and compact as possible, but this causes a problem that the amount of heat storage is reduced. was there.

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

The heat transport container according to the present invention heats the heat storage material by exchanging heat with a heat storage material having a temperature-sensitive polymer and water that show hydrophilicity and hydrophobicity depending on the temperature and a heating fluid. A heat exchanger that stores heat in the heat storage material and exchanges heat with the heat utilization fluid to absorb heat from the heat storage material and dissipate heat from the heat storage material, and the heat storage material are filled and the heat exchanger is housed. It is equipped with a container.

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

According to the heat transport container and the heat transport system according to the present invention, the heat transport container includes a heat storage material having a temperature-sensitive polymer and water that are hydrophilic and hydrophobic depending on the temperature. Then, when the heat is stored in the heat storage material, the temperature-sensitive polymer shrinks and separates from the liquid water. Therefore, it is possible to transport water other than the water separated after the heat is stored in the heat storage material. In other words, there is no need to transport water after heat is stored in the heat storage material, and the amount of heat storage does not decrease even if water is not transported, 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 transport after heat storage which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the heat exchange between the heat transport container and the heat source facility which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the heat transport container at the time of transport after heat radiation which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the heat exchange between the heat transport container and a heat utilization facility which concerns on Embodiment 1. FIG. It is a schematic diagram which shows the heat transport system which concerns on Embodiment 1. FIG.

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 drawings below, the relationship between the sizes of the constituent members may differ from the actual one.

Embodiment 1.
FIG. 1 is a schematic view showing a heat transport container 100 during heat storage post-transportation according to the first embodiment. FIG. 2 is a schematic view 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 view showing a heat transport container 100 during transportation after heat dissipation according to the first embodiment. FIG. 4 is a schematic view 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 transport means such as a truck or a vehicle. Note that FIGS. 1 and 3 are schematic views showing a truck 400 as an example of a transportation means for transporting the heat transport 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. The inside of the container 10 is filled with the heat storage material 30. Further, the container 10 houses the heat exchanger 20, and a plurality of openings 11 into which the heating pipe or the heat utilization pipe (hereinafter, simply referred to as the pipe 40) of the heat exchanger 20 is inserted are formed on the side surface thereof. .. Further, the container 10 is formed with an opening 12 for discharging 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 made by processing a metal such as SUS or Cu 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 inside the pipe 40. 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 straddle the inside and the outside of the container 10.

In the first embodiment, the opening 11 is formed on the side surface of the container 10, but the opening 11 may be formed above or below the container 10. In the opening 11 of 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 pipe 40 is the heating fluid or heat of the external heat exchanger 500. It suffices if it is formed at a position where it can be easily connected to the pipe through which the fluid to be used flows.

Further, the heat exchanger 20 may have a structure capable of heating and dissipating heat from the heat storage material 30, and the shape and material can be appropriately changed. For example, the heat exchanger 20 is not a fin-and-tube type, and the heating fluid or the heat utilization fluid and the heat storage material 30 may 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 the temperature. The temperature is the lower critical solution temperature (LCST) with respect to water. The polymer exhibits hydrophilicity when the temperature is lower than the lower limit critical solution temperature, and exhibits hydrophobicity when the temperature is higher than the lower limit critical solution temperature. A polymer whose properties change significantly at a specific temperature is called a temperature-sensitive polymer, and a gel containing the water is called a temperature-sensitive polymer gel. The heat storage material 30 is a temperature-sensitive polymer gel obtained by mixing a temperature-sensitive polymer and a mixed solvent, which is mainly water or a mixed solvent obtained by adding an appropriate amount of an organic solvent to water, to form a gel.

The temperature-sensitive polymer is not particularly limited as long as hydrophilicity and hydrophobicity change reversibly with respect to the lower limit critical solution temperature, and polyvinyl alcohol partial vinegared product and polyvinyl methyl ether. , Methyl cellulose, polyethylene oxide, polyvinyl methyl oxazolidinone, poly N-ethyl acrylamide, poly N-ethyl methacrylic amide, poly N-n-propyl acrylamide, poly N n-propyl methacrylic amide, poly N-isopropyl acrylamide, poly N-Isopropylmethacrylate, PolyN-Cyclopropylacrylamide, PolyN-Cyclopropylmethacrylate, PolyN-Methyl-N-Ethylacrylamide, PolyN, N-diethylacrylamide, PolyN-Methyl-N-Isopropylacrylamide, Poly N-Methyl-N-n-propylacrylamide, Poly N-Acryloylpyrrolidine, Poly N-Acryloyl Piperidine, Poly N-2-ethoxyethylacrylamide, Poly N-2-ethoxyethyl Methacrylate, Poly N-3-methoxypropylacrylamide , Poly N-3-methoxypropylmethacrylate, Poly N-3-ethoxypropylacrylamide, Poly N-3-ethoxypropylmethacrylate, Poly N-3-isopropylpropylacrylamide, Poly N-3-isopropylpropylmethacrylate , Poly N-3- (2-methoxyethoxy) Propylacrylamide, Poly N-3- (2-methoxyethoxy) Propyl Methacrylate, Poly N-Tetrahydrofurfurylacrylamide, Poly N-Tetrahydrofurfuryl Methacrylate, Poly N- 1-Methyl-2-methoxyethylacrylamide, Poly N-1-Methyl-2-methoxyethylmethacrylate, PolyN-1-methoxymethylpropylacrylamide, PolyN-1-methoxymethylpropylmethacrylate, PolyN- (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-ethylacrylamide, poly N-2-methoxyethyl-N-n-propylacrylamide, poly N-2-methoxyethyl-N-isopropylacrylamide, poly N , N-di (2-methoxyethyl ) Acrylamide can be used.

Further, as another example from the above, in the heat storage material according to the first example of the first embodiment, the temperature-sensitive polymer has a crosslinked structure, and a hydroxy group, a sulfonic acid group, and an oxysulfonic acid at the polymer terminal. It has one or more functional groups selected from the group consisting of a group, a sulfonic acid group and an oxyphosphate group. By adjusting the composition and crosslinked structure of these materials, it has been found that a temperature-sensitive 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. .. In one 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 even better if it is made of 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 ratio of the repeating unit is too large, that is, when the ratio of the repeating unit exceeds 99 mol% when the total of the repeating unit, the functional group, and the crosslinked structural unit is 100 mol%. The heat storage density becomes smaller. 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 crosslinked structural unit is 100 mol%, the ratio of the repeating unit is less than 70 mol%. In some cases, the LCST described below is not shown.

The crosslinked structural unit is a structural unit introduced by a crosslinking agent used in the production of the temperature-sensitive polymer, and examples of the crosslinking agent include N, N'-methylenebisacrylamide, N, N'-. Diallylacrylamide, N, N'-diacryloylimide, N, N'-dimethacryloylimide, triallylformal, diallylnaphthalate, 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, tetramethylolmethanetetramethacrylate, and divinyl derivatives such as divinylbenzene can be mentioned. , In particular, but not limited to these.

The heat storage material according to the first example of the first embodiment 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 and X represents a covalent group or a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphorus. It represents one or more functional groups selected from the group consisting of an acid group and an oxyphosphate group, and * represents a covalent bond) and the following general formula (2).

(In the formula, * represents a covalent bond, q represents an integer of 1 to 3), and includes a covalent bond of the structural unit represented by the above general formula (1). It is composed of a temperature-sensitive polymer gel having a crosslinked structure in which a hand and a covalent bond of a structural unit represented by the above general formula (2) are bonded.

In the heat storage material according to the first example of the first embodiment, the structural unit represented by the general formula (1), the functional group X, and the structural unit represented by the general formula (2). The molar ratio of 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), the functional group X, and the general formula (2) are represented. When the total of the constituent units is 100 mol%, the heat storage density becomes smaller when the ratio of the constituent units represented by the general formula (1) exceeds 99 mol%). 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 total of the constituent units represented is 100 mol%, LCST is not shown when the ratio of the constituent units represented by the general formula (1) is less than 70 mol%). In the present specification, 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 the preparation of raw materials. It is a theoretical value calculated from the quantity.

The heat storage material according to the first example of the first embodiment includes the structural unit represented by the general formula (1), the functional group X, and the structural unit represented by the general formula (2). Is included in the above molar ratio, and the number of repetitions of the structural units represented by the general formula (1) and the order in which the respective structural units are combined are not particularly limited. The number of repetitions of the structural unit 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, the LCST is mainly set in a wide range of 5 to 80 ° C. according to the types ^{of R 1} and R ^{2 in the general formula (1).} be able to. ^{R 1} in the general formula (1) is preferably a hydrogen atom or a methyl group from the viewpoint of further enhancing the temperature response. ^{R 2} in the general formula (1) is preferably an ethyl group, a methyl group or an isopropyl group from the viewpoint of further enhancing the temperature responsiveness. ^{Further, R 3} in the general formula (1) is preferably a hydrogen atom from the viewpoint of facilitating the production of a 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 oxyphosphate 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 polymerizable properties. The q in the general formula (2) is preferably 1 from the viewpoint of further increasing the heat storage density. The covalent bond in the general formulas (1) and (2) not only connects the same structural units or different types of structural units, but also partially forms a branched structure. good. The branch structure is not particularly limited.

The heat storage material according to the first example of the first embodiment 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 polymerizable monomer represented by a hydrogen atom or a methyl group), which is represented by the following general formula (6).

(In the formula, q represents an integer of 1 to 3), and a type 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) (a polymerizable monomer giving a structural unit represented by the general formula (1)) include, for example, N-ethyl (meth) acrylamide and 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 (Meta) 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. Can be mentioned. Among these, N-alkyl (1 to 3 carbon atoms) (meth) acrylamide is preferable, and N-isopropyl (meth) acrylamide is more preferable. In addition, in this specification, "(meth) acrylic" means methacryl or acrylic.

Specific examples of the cross-linking agent represented by the general formula (6) (cross-linking agent giving a structural unit represented by the general formula (2)) include N, N'-methylenebisacrylamide, N, N'-. Ethylene bisacrylamide and N, N'-(trimethylene) bisacrylamide can be mentioned.

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, N, N-dimethylparatoluidine in combination with the above-mentioned polymerization initiator, rapid radical polymerization at low temperature can be performed. 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, etc. Examples thereof include carbon tetrachloride, acetone, methyl ethyl ketone, tetrahydrofuran, dioxane, acetonitrile, dimethyl sulfoxide, N, N-dimethylformamide, N, N-dimethylacetamide and the like. Among these solvents, water is preferable from the viewpoint of further increasing the heat storage density. The radical polymerization reaction is usually carried out 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 cross-linking agent represented by the general formula (6), and the polymerization initiator is 2, 2 mol / L to 3 mol / L is particularly preferable from the viewpoint of further increasing the heat storage 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 obtained heat storage material may not show 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 lower) and a large heat storage density is not clear, but is considered as follows. The temperature-sensitive polymer having LCST exhibits hydrophilicity on the lower temperature side than LCST and hydrophobicity on the higher temperature side than LCST. Since the temperature-sensitive polymer constituting 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 has a high arrangement like the conventional temperature-sensitive polymer, but has a lower arrangement at a higher temperature than the LCST. Since the temperature-sensitive polymer constituting the heat storage material according to the first example of the first embodiment has a large change in the arrangement, it is only necessary to show a low heat storage operating temperature as in the conventional temperature-sensitive polymer. 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 high heat storage density, and a method for producing the same. Since the heat storage material according to the first example of the first embodiment has a relatively low heat storage operating temperature and a high heat storage density, the heat transport container 100 filled with the heat storage material can be miniaturized, and heat can be obtained. Suitable for transportation system.

The heat storage material according to the second example of the first embodiment 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 and X represents a covalent group or a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphorus. It represents one or more functional groups selected from the group consisting of an acid group and an oxyphosphate 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 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, and X represents a covalent bond or a hydroxy group or a sulfone. Represents one or more functional groups selected from the group consisting of an acid group, an oxysulfonic acid group, a phosphoric acid group and an oxyphosphate group, * represents a covalent bond, and p represents an integer of 1 to 3). 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 of the structural unit represented by the general formula (2) and the general formula (3). ) Or a temperature-sensitive polymer gel having a crosslinked structure in which a covalent bond of a structural unit represented by the above general formula (4) is bonded.

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

In the heat storage material according to the second example of the first embodiment, the sum of the structural units represented by the general formula (1) and the structural units represented by the general formula (3) or the general formula (4). The molar ratio of the functional group X 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 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 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), the functional group X, and the structural units represented by the general formula (2) is 100. When the total 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) exceeds 99 mol%) , The heat storage density becomes small. 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)). The total of the structural units and the structural units represented by the general formula (3) or the general formula (4), the functional group X, and the total of the structural units represented by the general formula (2). Is 100 mol%, and the total 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 less than 70 mol%. If there is), it will not show LCST. In the present specification, the total of the structural units represented by the general formula (1), the structural units represented by the general formula (3) or the general formula (4), and the functional group X are used. The molar ratio with the structural unit represented by the above general formula (2) is a theoretical value calculated from the amount of raw materials charged.

The heat storage material according to the second example of the first embodiment includes a structural unit represented by the general formula (1) and a structural unit 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) may be contained in the molar ratio, and the structural unit represented by the general formula (1) and the structural unit represented by the general formula (3) may be contained. ) Or the number of repetitions of the structural units represented by the above general formula (4) and the order in which the respective structural units are combined are not particularly limited. The number of repetitions 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 the first embodiment, the 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 according to the molar ratio with the constituent unit and the ^{types of R 1} and R ^{2 in the above general formula (1) and the types of R 4} and R ^{5 in} the above general formula (3) or the above general formula (4). It can be set in a wide range of ~ 80 ° C. ^{R 1} in the general formula (1) is preferably a hydrogen atom or a methyl group from the viewpoint of further enhancing the temperature response. ^{R 2} in the general formula (1) is preferably an ethyl group, a methyl group or an isopropyl group from the viewpoint of further enhancing 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 hydrogen atoms from the viewpoint of facilitating the production of a temperature-sensitive polymer. It is preferable to have. 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 oxyphosphate group so as to satisfy the above-mentioned molar ratio. It can be a functional group selected from. Among these functional groups, an oxysulfonic acid group is preferable from the viewpoint of further enhancing radical polymerizable properties. ^{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. The p in the general formulas (3) and (4) is preferably 1 or 2 from the viewpoint of further increasing the heat storage density. The q in the general formula (2) is preferably 1 from the viewpoint of further increasing the heat storage density. The covalent bond in the general formulas (1) to (4) not only connects the same structural units or different types of structural units, but also partially forms a branched structure. good. The branch structure is not particularly limited.

The heat storage material according to the second example of the first embodiment 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 polymerizable monomer represented by a hydrogen atom or a methyl group) and 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). The polymerizable monomer is represented by the following general formula (6).

(In the formula, q represents an integer of 1 to 3), and a type 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 cross-linking 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) (the polymerizable monomer giving the structural unit represented by the general formula (3)) include, for example, 2-hydroxymethyl acrylate and 2 acrylic acid. -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) (a polymerizable monomer giving a structural unit represented by the general formula (4)) include N- (1,1-dimethyl-2). -Hydroxyethyl) acrylamide, N- (1,1-dimethyl-2-hydroxypropyl) acrylamide, N- (1,1-dimethyl-2-hydroxybutyl) acrylamide, 2-acrylamide-2-methylpropanecarboxylic acid, 2 -Acrylamide-2-methylbutanecarboxylic acid, 2-acrylamide-2-methylpentanecarboxylic acid, 2-acrylamide-2-methylpropanesulfonic acid, 2-acrylamide-2-methylbutanesulfonic acid, 2-acrylamide-2-methyl Examples thereof include pentansulfonic acid, 2-acrylamide-2-methylpropane phosphate, 2-acrylamide-2-methylbutanephosphate, 2-acrylamide-2-methylpentanephosphate and the like. Among these, 2-acrylamide-2-methylpropanesulfonic acid and 2-acrylamide-2-methylpentanesulfonic acid are preferable.

Similar to the first example of the first embodiment, when radical polymerization is carried out using water as a solvent, the polymerizable monomer represented by the above general formula (5) and the above general formula (7) or the above 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 obtained heat storage material may not show 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. The water content was determined by measuring the weight of the heat storage material containing water at room temperature and then placing it in a constant temperature bath to evaporate the water at a drying temperature of 60 to 120 ° C., and the water disappeared (the weight did not decrease). By the way, the weight of the heat storage material can be measured, and the amount of decrease in weight can be obtained by assuming that it is water (dry weight loss method). Further, the heat storage material according to the first example and the second example of the first embodiment may be made porous. By making the heat storage material porous, there is an advantage that the temperature responsiveness is further improved. As a method for making the heat storage material porous, a mixed solution containing the above-mentioned polymerizable monomer, cross-linking agent, polymerization initiator and porogen (pore-forming agent) is prepared, a cross-linked structure is formed by a radical polymerization reaction, and then washing is performed. There is a method of removing the porogen. When the radical polymerization reaction is carried out using water as a solvent, preferred porogens are water-soluble carbohydrates such as sucrose, maltose, cerbiose, lactose, sorbitol, xylitol, glucose and fructose. A pologene composition containing these water-soluble carbohydrates and polyethylene glycol, polyvinylpyrrolidone, polyvinyl alcohol or a mixture thereof may be used. Further, as another method for making the heat storage material porous, there is a method of removing water from a 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 contains a mixed solution containing at least the above-mentioned polymerizable monomer, cross-linking agent and polymerization initiator as a metal in the heat absorbing and radiating pipe. It can also be produced by applying it to a surface (for example, stainless steel, copper, aluminum, etc.) and radically polymerizing it. The mixed solution may contain a metal surface activator, a coupling agent, and the like. Further, the temperature-sensitive polymers according to the first example and the second example of the first embodiment can also be produced by irradiating the coating film of the above-mentioned mixed solution with radiation.

[Examples 1 to 5 and Comparative Examples 1 to 5]
The aqueous raw material 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. After drying, the mixture was equilibrium-swelled with distilled water to obtain a temperature-sensitive polymer gel, which was then sealed in a closed aluminum container, and the endothermic peak temperature and heat storage density were measured with 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: Carium 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 a low endothermic peak temperature of 36 ° C. to 77 ° C. and a heat storage density of 512 J / g to 844 J / g. It was big. 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 between the hydrophilicity and the hydrophobicity of the temperature-sensitive polymer gel in which the heat storage operating temperature was exhibited, the water temperature was 36 ° C. to 77 ° C., and the gel was in a liquid state. On the other hand, the temperature-sensitive polymer gels obtained in Comparative Examples 1 to 5 have a low endothermic peak temperature of 32 ° C. to 68 ° C., similar to conventional heat storage materials such as paraffin, fatty acid, and sugar alcohol. The heat storage density was extremely small, 31 J / g to 42 J / g.

The water is preferably pure water, but it does not have to be pure water as long as it does not contain components that may deteriorate the polymer. Water is divided into bound water bound to a high-density crosslinked product of a polymer and free water excluding bound water. Since the polymer has a hydrophilic swelling structure at a temperature lower than the lower limit critical solution temperature, the bound water of water forms a stable high-arranged structure and enhances the hydrogen bonding force. On the other hand, since the polymer has a hydrophobic shrinkage structure at a temperature higher than the lower limit critical solution temperature, the bound water of water forms an unstable low-arranged structure 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 limit critical solution temperature. As described above, the heat storage material 30 has a high heat storage amount corresponding to the change in the hydrogen bonding force because the hydrogen bonding force of the bound water can be changed before and after the lower limit critical solution temperature. 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 made lighter and more compact.

The organic solvent to be added to water as a mixed solvent is selected from polar organic solvents, preferably alcohols such as methanol, ethanol, propanol, isopropanol, isopentanol and 2-methoxyethanol, acetone, methyl ethyl ketone and 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 high solubility in water is suitable.

(Heat storage 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. As shown in FIG. 1, the heat storage operation of the heat transport container 100 is performed at the heat source facility 200 via the external heat exchanger 500 after the heat transport container 100 is transported to the heat source facility 200 by a transport means such as a truck 400. .. When the heating fluid flows through the pipe 40, the heat of the heating fluid is transferred to the heat storage material 30 through the pipe 40, and the temperature of the heat storage material 30 rises. The polymer contained in the heat storage material 30 shrinks when the temperature rises and exceeds the lower limit critical solution temperature. This is called a shrinkage process. In the shrinkage step, the water-bonded water is arranged in a low arrangement and the hydrogen-bonding force is reduced. As a result, the heat storage material 30 absorbs hydrogen bond energy corresponding to the decrease in hydrogen bond force. That is, the polymer has a shrinkage step, and the endothermic energy due to the low arrangement of the bound water of water is stored in the heat storage material 30 in the shrinkage step. In the shrinking step, water is in a liquid state. After that, the heating fluid flows out of the container 10 after the temperature drops.

(Heat dissipation operation of heat transport container)
Next, the heat dissipation operation of the heat transport container 100 shown in FIG. 4 will be described. In the heat dissipation operation of the heat transfer container 100, as shown in FIG. 3, after the heat transport container 100 is transported to the heat utilization facility 300 by a transportation means such as a truck 400, the heat utilization facility 300 passes through the external heat exchanger 500. Will be 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 through the pipe 40, and the temperature of the heat storage material 30 drops. The polymer contained in the heat storage material 30 swells when the temperature drops below the lower limit critical solution temperature. This is called a swelling step. In the swelling step, the bound water of water is arranged in a high arrangement and the hydrogen bonding force is increased. The heat storage material 30 generates heat of hydrogen bond energy corresponding to an increase in hydrogen bond force. That is, the polymer has a swelling step, and the heat generation energy due to the high arrangement of the bound water of water is dissipated from the heat storage material 30 in the swelling step. In the swelling step, water is in a liquid state. After that, the heat-utilizing fluid flows out of the container 10 after the temperature rises.

As described above, in the heat transport container 100, heat storage and heat dissipation of the heat storage material 30 are performed inside the container 10 by the shrinkage step and the swelling step of the polymer. In the shrinkage step and the swelling step, the water is in a liquid state, and the heat transport container 100 does not require a water evaporation step and a condensation step. Therefore, it is not necessary to provide a condensing portion that condenses and liquefies water vapor and a water transport path through which the liquefied hot water flows outside the container 10. Therefore, the heat transport container 100 can be made lighter and more compact. Further, the heat storage material 30 changes the level of the hydrogen bonding force of the water binding water, and has a high heat storage amount corresponding to the change in the hydrogen bonding force. Therefore, since the filling amount of the heat storage material 30 can be reduced, the heat transport container 100 can be made lighter and more compact.

In addition, a sheet or a film having a plurality of openings having dimensions that do not allow the polymer to pass through may be provided in the container 10 in a layered manner. 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 becomes easy to discharge the water separated after heat storage from the heat transport container 100. ..

FIG. 5 is a schematic view showing a 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. After transporting 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, heat is exchanged between the heat transport container 100 and the heat source facility 200 via the external heat exchanger 500, and heat is stored in the heat storage material 30. After storing heat 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 transport means such as a truck 400. After transporting 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 dissipate heat from the heat storage material 30.

After that, the heat transport container 100 is transported to the heat source facility 200 again by a transport means such as a 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, so that the heat transport container 100 can be made lighter and more 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 a temperature-sensitive polymer showing hydrophilicity and hydrophobicity depending on the temperature and water, and the heating fluid. The heat storage material 30 is heated to store heat in the heat storage material 30, and the heat exchanger 20 that exchanges heat with the heat utilization fluid to absorb heat from the heat storage material 30 and dissipate heat from the heat storage material 30 and the heat storage material 30 are filled with heat. It includes a container 10 in which the exchanger 20 is housed.

According to the heat transport container 100 according to the first embodiment, the heat transport container 100 includes a heat storage material 30 having a temperature-sensitive polymer and water that are hydrophilic and hydrophobic depending on the temperature. .. Then, when heat is stored in the heat storage material 30, the temperature-sensitive polymer shrinks and separates from water in a liquid state. Therefore, it is possible to transport water other than the water separated after the heat is stored in the heat storage material 30. That is, it is not necessary to transport water after the heat is stored in the heat storage material 30, and the amount of heat storage does not decrease even if the water is not transported. Therefore, the heat transport container 100 is made lighter and more compact without reducing the amount of heat storage. Can be realized.

Further, it is desirable that the heat transport container 100 is not filled with heat medium oil. If the heat transport container 100 does not contain heat medium oil or the like that separates from water, even if an accident or the like occurs during transportation of the heat transport container 100, a large amount of heat medium oil leaks and burns or explodes. Or, it is possible to prevent situations such as polluting the environment.

Further, in the heat transport container 100 according to the first embodiment, the temperature-sensitive polymer shrinks when the temperature rises and exceeds the lower limit critical solution temperature, and the temperature drops below the lower limit critical solution temperature. The heat storage material 30 stores heat in the shrinkage step and dissipates heat in the swelling step.

According to the heat transport container 100 according to the first embodiment, heat storage and heat dissipation of the heat storage material 30 are performed inside the container 10 by the shrinkage step and the swelling step of the temperature sensitive polymer. In the shrinkage step and the swelling step, the water is in a liquid state, and the heat transport container 100 does not require a water evaporation step and a condensation step. Therefore, it is not necessary to provide a condensing portion that condenses and liquefies water vapor and a water transport path through which the liquefied hot water flows outside the container 10. Therefore, the heat transport container 100 can be made lighter and more compact.

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

According to the heat transport container 100 according to the first embodiment, the water separated when the heat storage material 30 stores heat in the shrinking step can be discharged from the opening 12 of the container 10, and the heat transport container 100 can be transported during transportation. Since it is possible to reduce the weight and size of the container, 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 transport means, heat is exchanged with the heat source facility 200 to store heat in the heat storage material 30, and then the heat transport container 100 is transferred. It is transported to the heat utilization facility 300 by a transportation means, exchanges heat with the heat utilization facility 300, and dissipates 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 can be obtained.

Embodiment 2.
Hereinafter, the second embodiment will be described, but the description of the parts overlapping with the first embodiment will be omitted, and the same parts as those of the first embodiment or the corresponding parts will be designated 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, and at that 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 transport container 100 has been reduced in weight, the transport weight has been reduced, and the size has been reduced, and the transport cost has been reduced.

However, instead of transporting the heat transport container 100 itself, the heat storage material 30 excluding the water separated from the heat storage material 30 after heat storage is taken out from the container 10 and filled in a separate container that can be sealed, and the separate container is used as a transportation means. It may be loaded and transported in. In this case, at the heat utilization facility 300, a heat storage device for heat dissipation equipped with a container and a heat exchanger is prepared, and the same amount of water as the separated amount and the transported heat storage material 30 are stored for heat dissipation. Fill the container of the device and dissipate heat. As a result, the transportation weight can be further reduced, so that the transportation cost can be significantly reduced. It is also 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, the heat transport container 100 is transported to the heat source facility 200 by a transport means, heat is exchanged with the heat source facility 200 to store heat in the heat storage material 30, and then the opening 12 of the container 10 is used. The water separated from the heat storage material 30 is discharged from the heat storage material 30, the heat storage material 30 is taken out from the container 10 and filled in a separate sealable container, and the separate container is transported to the heat utilization facility 300 by a transportation means to transport the heat storage material 30 to the heat utilization facility 300. It exchanges heat with and dissipates heat from the heat storage material 30.

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 pipes, 100 heat transport containers, 200 heat source facilities, 300 heat utilization facilities, 400 trucks, 500 external heat exchangers.

The heat transport container according to the present invention heats the heat storage material by exchanging heat with a heat storage material having a temperature-sensitive polymer and water that show hydrophilicity and hydrophobicity depending on the temperature and a heating fluid. A heat exchanger that stores heat in the heat storage material and exchanges heat with the heat utilization fluid to absorb heat from the heat storage material and dissipate heat from the heat storage material, and the heat storage material are filled and the heat exchanger is housed. The temperature-sensitive polymer comprises a container and has a shrinkage step of shrinking when the temperature rises and exceeds the lower limit critical solution temperature, and the container has a shrinkage step when the heat storage material stores heat in the shrinkage step. It has a mechanism to discharge the separated water .

Claims (10)

A heat storage material having a temperature-sensitive polymer and water that show hydrophilicity and hydrophobicity depending on the temperature,
A heat exchanger that exchanges heat with a heating fluid to heat the heat storage material to store heat in the heat storage material, and exchanges heat with a heat utilization fluid to absorb heat from the heat storage material and dissipate heat from the heat storage material.
A heat transport container comprising a container filled with the heat storage material and accommodating the heat exchanger. The temperature-sensitive polymer has a shrinkage step of shrinking when the temperature rises and exceeds the lower limit critical solution temperature, and a swelling step of swelling when the temperature drops below the lower limit critical solution temperature.
The heat transport container according to claim 1, wherein the heat storage material stores heat in the shrinkage step and dissipates heat in the swelling step. The heat transport container according to claim 2, wherein the container has a mechanism for discharging water separated when the heat storage material stores heat in the shrinkage step. The heat storage material is
The temperature-sensitive polymer has a crosslinked structure and has one or more functional groups selected from the group consisting of a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphoric acid group and an oxyphosphate group at the molecular terminal. However, since the temperature-sensitive polymer has water, it is a temperature-sensitive polymer gel having a heat absorption peak temperature in the range of 30 ° C. to 90 ° C. and a heat storage density of 300 J / g or more. The heat transport container according to any one of Items 1 to 3. The heat storage material is
The temperature-sensitive polymer has a crosslinked structure and has one or more functional groups selected from the group consisting of a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphoric acid group and an oxyphosphate group at the molecular terminal. The molar ratio of the repeating unit constituting the temperature-sensitive polymer, the functional group, and the crosslinked structural unit is 99: 0.5: 0.5 to 70:20:10. The heat transport container according to any one of 3 to 3. The heat storage material is
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 and X represents a covalent bond or a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphorus. Represents one or more functional groups selected from the group consisting of an acid group and an oxyphosphate group, and * represents a covalent bond) and a structural unit represented by
The following general formula (2)

(In the formula, * represents a covalent bond and q represents an integer of 1 to 3).
It has a crosslinked structure in which the covalent bond of the structural unit represented by the general formula (1) and the covalent bond of the structural unit represented by the general formula (2) are bonded.
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 transport container according to any one of claims 1 to 3, which is a temperature-sensitive polymer gel having a ratio of 70:20: 7. The heat storage material is
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 and X represents a covalent bond or a hydroxy group, a sulfonic acid group, an oxysulfonic acid group, a phosphorus. Represents one or more functional groups selected from the group consisting of an acid group and an oxyphosphate group, and * represents a covalent bond) and a structural unit represented by
The following general formula (2)

(In the formula, * represents a covalent bond and q represents an integer from 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, and X represents a covalent bond or a hydroxy group or a sulfone. It represents one or more functional groups selected from the group consisting of an acid group, an oxysulfonic acid group, a phosphoric acid group and an oxyphosphate group, where * 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) and the covalent bond of the structural unit represented by the general formula (2) are represented by the general formula (3) or the general formula (4). It has a cross-linked structure in which the covalent bonds of the constituent units are bonded.
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 units represented by the general formula (1) and the structural units represented by the general formula (3) or the general formula (4), the functional group X, and the general formula (2). The method according to any one of claims 1 to 3, wherein the temperature-sensitive polymer gel has a molar ratio of 99: 0.5: 0.5 to 70: 23: 7 with respect to the structural unit represented by. Heat transport container. The heat transport container according to any one of claims 1 to 7 is transported to a heat source facility by a transport means, heat is 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 heat to a heat utilization facility by means, exchanges heat with the heat utilization facility, and dissipates 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 transportation means. The heat transport system according to claim 8, which is subordinate to claim 3. The heat transport container according to any one of claims 4 to 7, which is subordinate to claim 3 or claim 3, is transported to a heat source facility by a transportation means, exchanges heat with the heat source facility, and stores heat in the heat storage material. After that, the water separated from the heat storage material is discharged from the mechanism of the container, the heat storage material is taken out from the container and filled in another sealable container, and the separate container is filled with the heat utilization facility by the transportation means. A heat transport system that transports heat to the heat storage facility and exchanges heat with the heat storage facility to dissipate heat from the heat storage material.

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