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High-heat-conductivity inorganic phase-change energy storage material

An energy storage material and inorganic phase change technology, applied in the field of energy storage materials, can solve the problems of reducing cycle life, restricting practical application, phase separation, etc., to improve thermal conductivity, reduce free space for free movement, and solve the effect of phase separation

Inactive Publication Date: 2014-10-08
PIONEER ENERGY JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of phase change material mainly includes alkali and alkaline earth metal halides, nitrates, phosphates, carbonates, etc. For example, Na2HPO4·12H2O is a commercial phase change material with low cost and high energy storage performance, and its phase change temperature is 35.4 ℃, the latent heat of phase change is 266kJ / kg, but the above-mentioned inorganic salt hydrate materials are prone to supercooling and phase separation, resulting in material precipitation, reducing cycle life, and seriously restricting practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Mix 0.25Kg of barium carbonate, 0.1Kg of sodium polyacrylate emulsion and 0.15Kg of water, and then heat it to above 60°C to obtain a well-mixed mixture; then add 98.5Kg of barium hydroxide octahydrate to the mixture, Add 1Kg of expanded graphite, heat the mixture to about 90°C to fully melt the barium hydroxide octahydrate, and stir vigorously until the mixture of the four materials is uniform after melting, until the mixture is not delaminated, that is, the inorganic phase change storage tank with high thermal conductivity is obtained. Energy Materials Product A1.

[0037] The above-obtained product A1 was subjected to DSC analysis, and the results are shown in Table 1.

Embodiment 2

[0039] Mix 3.0Kg of calcium carbonate, 2.0Kg of instant transparent thickening powder and 3.5Kg of water, and then heat it to above 60°C to obtain a well-mixed mixture; then add 90Kg of crystalline sodium acetate and 1.5kg copper powder (100 mesh), heat the mixture to about 80°C to fully melt the crystalline sodium acetate, after melting, stir vigorously until the mixture of the four materials is uniform, until the mixture has no delamination phenomenon, that is, the inorganic phase transition with high thermal conductivity is obtained Energy storage material product A2.

[0040] The above-obtained product A2 was subjected to DSC analysis, and the results are shown in Table 1.

Embodiment 3

[0042] Mix 6Kg of strontium carbonate (nucleating agent), 2.0Kg of sodium polyacrylate emulsion and 3.0Kg of water thoroughly, and then heat it to above 60°C to obtain a well-mixed mixture; then add 87Kg of decahydrate sulfuric acid to the mixture Sodium and 2kg of carbon powder, heat the mixture to about 80 ℃, so that the sodium sulfate decahydrate is fully melted, and after melting, vigorously stir until the mixture of the four materials is uniform, until the mixture is not delaminated, that is, the inorganic phase change storage tank with high thermal conductivity is obtained. Energy Materials Products A3.

[0043] The above-obtained product A3 was subjected to DSC analysis, and the results are shown in Table 1.

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Abstract

The invention relates to the technical field of energy storage materials, particularly a high-heat-conductivity inorganic phase-change energy storage material. The high-heat-conductivity inorganic phase-change energy storage material is composed of the following components in percentage by mass: 80-99.4% of energy storage material, 0.25-10% of nucleating agent, 0.1-15% of modifier, 0.1-15% of water and 0.15-19% of heat-conducting reinforcing material. The energy storage material is crystalline hydrated salt, the nucleating agent is carbonate or borate, the modifier is a polyacrylic acid emulsion or thickening powder, and the heat-conducting reinforcing material is one or mixture of more of graphite, carbon powder, copper powder, carbon fiber and silicon carbide powder. Compared with the prior art, the energy storage material has the advantages of high stability, low tendency to supercooling, high latent heat energy, high heat conductivity and the like. By selecting the proper modifier and proportion thereof, the heat-conducting reinforcing material and nucleating agent material can be successfully dispersed uniformly in the system, thereby solving the problem of the phenomenon of phase separation of the material due to long-term cycle, further enhancing the heat-conducting property of the material and being worthy of popularization and application.

Description

[Technical field] [0001] The invention relates to the technical field of energy storage materials, in particular to a high thermal conductivity inorganic phase change energy storage material. [Background technique] [0002] The research of energy storage is a strategic subject of energy security and sustainable development, in which the storage and application of heat is closely related to the international people's livelihood. Energy storage technology, especially phase change energy storage technology, is an important technology for rational and effective utilization of existing energy, optimal use of renewable energy and improvement of energy utilization efficiency. It has been a very active research direction in the field of energy conservation in the world in the past 20 years. [0003] Using the phase transition of materials to store energy and realize the storage and utilization of energy is an effective way to alleviate the mismatch between energy supply and demand i...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 刘硕刘承梅王长君
Owner PIONEER ENERGY JIANGSU
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