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Low-temperature phase change thermal 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, low addition ratio, The effect of low supercooling

Inactive Publication Date: 2012-10-31
路生吉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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

[0017] Weigh sodium acetate trihydrate, sodium pyrophosphate decahydrate and polyacrylamide in proportions of 96%, 2% and 2% by weight respectively, first heat the weighed sodium acetate trihydrate to 69°C in the reaction kettle , after completely melting, add the weighed sodium pyrophosphate decahydrate and polyacrylamide into the reaction kettle in turn, stir and mix, and after fully stirring evenly, put them into the experimental container while hot. The injected volume is 88% of the volume of the container, and 12% of the space is left in the container, and the container is sealed after the liquid is cooled.

[0018] After testing, the latent heat of the low-temperature phase change heat storage material prepared in this embodiment is 248 kJ / kg, the crystallization temperature is 55°C, and the degree of supercooling is 2°C.

Embodiment 2

[0020] Weigh sodium acetate trihydrate, sodium pyrophosphate decahydrate and polyacrylamide in proportions of 97%, 1.5% and 1.5% by weight respectively, first heat the weighed sodium acetate trihydrate to 70°C in the reaction kettle , after completely melting, add the weighed sodium pyrophosphate decahydrate and polyacrylamide into the reaction kettle in turn, stir and mix, and after fully stirring evenly, put them into the experimental container while hot. The injected volume is 89% of the volume of the container, and 11% of the space is left in the container, and the container is sealed after the liquid cools down.

[0021] After testing, the latent heat of the low-temperature phase change heat storage material prepared in this embodiment is 250 kJ / kg, the crystallization temperature is 56°C, and the degree of supercooling is 1.5°C.

Embodiment 3

[0023] Weigh sodium acetate trihydrate, sodium pyrophosphate decahydrate and polyacrylamide in proportions of 98%, 1% and 1% by weight respectively, first heat the weighed sodium acetate trihydrate to 71°C in the reaction kettle , after completely melting, add the weighed sodium pyrophosphate decahydrate and polyacrylamide into the reaction kettle in turn, stir and mix, and after fully stirring evenly, put them into the experimental container while hot. The volume injected is 90% of the volume of the container, and 10% of the space is left in the container, and the container is sealed after the liquid cools down.

[0024] After testing, the latent heat of the low-temperature phase change heat storage material prepared in this example is 253 kJ / kg, the crystallization temperature is 57°C, and the degree of supercooling is 1.8°C.

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Abstract

The invention provides a low-temperature phase change thermal storage material and a preparation method thereof. The low-temperature phase change thermal storage material comprises the following components by weight: 96-98% of sodium acetate trihydrate, 1-2% of sodium pyrophosphate decahydrate and 1-2% of polyacrylamide. The preparation method comprises the following steps: weighed sodium acetate trihydrate is heated in a reaction kettle to 68.5-71 DEG C; weighed sodium pyrophosphate decahydrate and polyacrylamide are sequentially added in the reaction kettle after the sodium acetate trihydrate is completely melted; stirring and mixing are performed at the same time; the mixture at 68.5-71 DEG C is filled into a container after being stirred fully and uniformly, with the volume dose of the mixture filled into the container being 88-90% of the volume of the container; and the container is sealed after the liquid mixture is cooled to be at room temperature. The invention has the advantages that fewer additives are added; the material is high in stability and phase change latent heat and moderate in crystallization temperature, and doesn't exceed 2 DEG C in degree of supercooling; the phase change thermal storage material is a gelatiniform liquid when melted, so as to avoid a phase separation phenomenon; the preparation process is simple, and the encapsulation is easy; and the production is convenient.

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. Thermal storage can solve the problem of energy waste caused by the mismatch between thermal energy supply and demand in time and space. 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 re...

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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