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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, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of complex preparation process, many additives, high subcooling degree, 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, anhydrous sodium carbonate and polyacrylamide in proportions of 90%, 5%, 3% and 2% by weight respectively, and grind the four components to 50 mesh , and mix evenly, then heat in a water bath at 74-75°C to completely melt each component and become a colloidal liquid. Stir the colloidal liquid evenly and pour it into a stainless steel cylindrical container. The volume of injection is the volume of the container 88% of 88%, 12% of the space is left in the container, and the container is sealed after the gelatinous liquid is cooled to room temperature.

[0018] After testing, the latent heat of the low-temperature phase change heat storage material prepared in this embodiment is 238 kJ / kg, the crystallization temperature is 55°C, and the degree of supercooling is 1.2°C.

Embodiment 2

[0020] Weigh sodium acetate trihydrate, sodium pyrophosphate decahydrate, anhydrous sodium carbonate and polyacrylamide in proportions of 91%, 5%, 3% and 1% by weight respectively, and grind the four components to 40 mesh , and mix evenly, and then heat in a water bath at 75-76°C to completely melt each component and become a colloidal liquid. Stir the colloidal liquid evenly and inject it into a stainless steel cylindrical container. The volume of injection is the volume of the container 89%, 11% of the space is left in the container, and the container is sealed after the gelatinous liquid is cooled to room temperature.

[0021] After testing, the latent heat of the low-temperature phase change heat storage material prepared in this embodiment is 243kJ / kg, the crystallization temperature is 57°C, and the degree of supercooling does not exceed 1.0°C.

Embodiment 3

[0023] Weigh sodium acetate trihydrate, sodium pyrophosphate decahydrate, anhydrous sodium carbonate and polyacrylamide in proportions of 92%, 4%, 3% and 1% by weight respectively, and grind the four components to 30 mesh , and mix evenly, then heat in a water bath at 77-79°C to completely melt each component and become a colloidal liquid. Stir the colloidal liquid evenly and pour it into a stainless steel cylindrical container. The volume of injection is the volume of the container 90%, 10% of the space is left in the container, and the container is sealed after the gelatinous liquid is cooled to room temperature.

[0024] 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 56°C, and the degree of supercooling is 1.8°C.

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Abstract

The invention provides a low-temperature phase-change heat storage material and a preparation method thereof. The low-temperature phase-change heat storage material comprises the following components in percentage by weight: 90%-92% of sodium acetate trihydrate, 3%-5% of tetrasodium pyrophosphate decahydrate, 2%-3% of anhydrous sodium carbonate and 1%-2% of polyacrylamide. The preparation method comprises the following steps of: grinding the four components until the granularity is 30-50 meshes respectively, mixing uniformly, and heating the mixture in a water bath at the temperature of 74-79 DEG C, so as to completely melt all the components to form a colloidal liquid; after stirring uniformly, injecting the colloidal liquid into a container, wherein the injected volume is 88%-90% of the volume of the container; and after the colloidal liquid is cooled to room temperature, sealing the container. According to the invention, the adding ratio of an additive is low, the stability of the material is high, the phase-change latent heat is large, the crystallization temperature is moderate, and the supercooling degree is not more than 2 DEG C; and the phase-change heat storage material is the colloidal liquid in melting, so that the phase separation phenomenon is avoided, the preparation process is simple, the packaging 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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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 张兆海陈文兵
Owner 路生吉
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