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Low-temperature phase-change heat storage material and preparation method thereof

A heat storage material and low-temperature phase change technology, which is applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of complex preparation process, many additives, and high degree of supercooling, and achieve simple preparation process, few types, and ease of use. The effect of encapsulation

Inactive Publication Date: 2012-10-24
路生吉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned heat storage materials have many additives, high cost, complicated preparation process, and the supercooling degree is higher than 4°C

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Weigh sodium acetate trihydrate, disodium hydrogen phosphate dodecahydrate, and gelatin in proportions of 90%, 5.8%, and 4.2% by weight, grind the three components to 30 mesh, mix well, and mix the mixture at 69 Heat in a water bath at ℃ to melt all the components completely and form a colloidal liquid. Stir the colloidal liquid evenly and pour it into the container. Seal the container after cooling the liquid to room temperature.

[0014] After testing, the latent heat of the low-temperature phase change heat storage material prepared in this example is 238 kJ / kg, the crystallization temperature is 52°C, and the degree of supercooling is 1.5°C.

Embodiment 2

[0016] Weigh sodium acetate trihydrate, disodium hydrogen phosphate dodecahydrate and gelatin in proportions of 91%, 5% and 4% by weight respectively, grind the three components to 40 mesh, mix well, and mix the mixture at 70 Heat in a water bath at ℃ to melt all the components completely and form a colloidal liquid. Stir the colloidal liquid evenly and inject it into the container. Seal the container after cooling the liquid to room temperature.

[0017] After testing, the latent heat of the low-temperature phase change heat storage material prepared in this embodiment is 240 kJ / kg, the crystallization temperature is 53°C, and the degree of supercooling is 0.8°C.

Embodiment 3

[0019] Weigh sodium acetate trihydrate, disodium hydrogen phosphate dodecahydrate and gelatin in proportions of 92%, 4.5% and 3.5% by weight, grind the three components to 50 mesh, mix well, and mix the mixture at 72 Heat in a water bath at ℃ to melt all the components completely and form a colloidal liquid. Stir the colloidal liquid evenly and inject it into the container. Seal the container after cooling the liquid to room temperature.

[0020] After testing, the latent heat of the low-temperature phase change heat storage material prepared in this example is 243 kJ / kg, the crystallization temperature is 52°C, and the degree of supercooling is 1.0°C.

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Abstract

The invention provides a low-temperature phase-change heat storage material and a preparation method thereof. The heat storage material comprises the following three components in percentage by weight: 90-92% of sodium acetate trihydrate, 4.5-5.8% of sodium phosphate dibasic dodecahydrate and 2.2-4.2% of gelatin. The preparation method comprises the following steps of: grinding all the three components into 30-50 meshes, uniformly mixing the three powders, heating the mixture in a 69-72 DEG C water bath so that all components are fully melted to become a colloidal liquid, uniformly agitating the colloidal liquid, injecting the colloidal liquid into a container, cooling the colloidal liquid into room temperature and sealing the container, wherein the injection volume of the colloidal liquid is 88-90% of the volume of the container. The low-temperature phase-change heat storage material has fewer additive varieties, high stability, great latent heat of phase change and moderate crystallization temperature, and the degree of supercooling does not exceed 2 DEG C. The phase-change heat storage material becomes a colloidal liquid when melted, the phase separation phenomenon is avoided, the preparation process is simple, and the phase-change heat storage material is easy to package and convenient to produce.

Description

technical field [0001] The invention relates to a thermal storage material for low-temperature phase transition and a preparation method thereof, belonging to the technical field of thermal storage materials. Background technique [0002] The application of heat storage technology can not only adjust the contradiction between energy supply and demand, realize the "peak shifting" of power supply, balance the energy system, but also make full use of industrial waste heat, improve energy utilization rate, and reduce production costs. At present, heat storage technologies mainly include sensible heat storage, phase change heat storage and reversible chemical reaction heat storage. Compared with the other two heat storage methods, phase change heat storage has the advantages of large heat storage density and small heat storage volume. , heat release temperature stability and other advantages, so phase change heat storage has been widely valued by people, phase change heat storage...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 张兆海陈文兵
Owner 路生吉
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