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Sodium acetate trihydrate phase change energy storage material compositions

A material composition, phase change energy storage technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., to achieve the effects of high heat storage density, high phase change stability, and best temperature adjustment ability

Inactive Publication Date: 2011-10-12
WIDE SPACE PHASE CHANGE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The properties of sodium acetate are between inorganic salts and organic acid salts. Experiments show that a single thickener cannot fundamentally solve the problem of layering and precipitation. Reaching 40-50%, about half of the sodium acetate cannot continue to participate in the phase transition process

Method used

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  • Sodium acetate trihydrate phase change energy storage material compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Heat 540g of water to 60-70°C, add 820g of anhydrous sodium acetate under stirring condition, keep the system temperature above 60°C, add Na 2 SO 4 10H 2 O 27.2g, CaSO 4 68g, carboxymethyl cellulose 13.6g, sodium polyacrylate 0.68g, ethylene bis (dodecyl dihydroxyethyl ammonium chloride) 0.14g, after mixing uniformly, test its phase transition temperature to be 57.6 ℃, pass The coldness is 2.5°C, and the latent heat value of phase change is 253kJ / kg. After 3000 times of cold and heat cycle tests, no obvious solid-liquid separation phenomenon appeared in the phase change system.

Embodiment 2

[0021] Heat 54kg of water to 60-70°C, add 82kg of anhydrous sodium acetate under stirring condition, keep the system temperature above 60°C, add Na 2 SO 4 10H 2 O 4.76g, CaSO 4 8.16kg, carboxymethyl cellulose 4.08kg, sodium polyacrylate 136g, ethylene bis(octadecyldihydroxyethylammonium chloride) 68g, after mixing evenly, test its phase transition temperature is 56.9 ℃, supercooled The temperature is 2.1°C, and the latent heat value of phase change is 248.2kJ / kg. After 3000 times of cold and heat cycle tests, no obvious solid-liquid separation phenomenon appeared in the phase change system.

Embodiment 3

[0023] Heat 1.08kg of water to 60-70°C, add 1.64kg of anhydrous sodium acetate under stirring condition, keep the system temperature above 60°C, add Na 2 SO 4 10H 2 O 136g, CaSO 4 108.8g, carboxymethyl cellulose 40.8g, sodium polyacrylate 8.16g, ethylene bis(hexadecyl dihydroxyethyl ammonium chloride) 2.18g, after mixing evenly, test its phase transition temperature is 57.8 ℃, The degree of subcooling is 1.9°C, and the latent heat value of phase change is 243kJ / kg. After 3000 times of cold and heat cycle tests, no obvious solid-liquid separation phenomenon appeared in the phase change system.

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Abstract

The invention discloses sodium acetate trihydrate phase change energy storage material compositions. The compositions mainly comprises sodium acetate trihydrate, a nucleating agent, a thickening agent and the like; and the phase change temperature is between 56 and 58 DEG C, the degree of supercooling is less than 3 DEG C and the phase change latent heat is more than 220kJ / kg. 3,000 times of cold and heat cycle tests prove that the compositions have particularly excellent phase change stability.

Description

technical field [0001] The invention relates to a phase change energy storage material composition, which has a phase change temperature of 56-58°C and an undercooling degree of less than 3°C. Compared with organic phase change materials, they have higher heat storage density and excellent temperature regulation ability. Through formula optimization, the composition has extremely high phase change stability, and the cold and hot cycle test exceeds 3000 times. The phase-change energy storage material composition obtained according to the present invention can be used in fields such as solar energy storage, waste heat recovery, and temperature regulation in a specific environment. Background technique [0002] In the process of energy conversion and utilization, there are often contradictions between supply and demand that cannot be effectively matched in time and space, such as peak-to-valley differences in power loads caused by electricity consumption, intermittent supply o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 万福新王金波杜守琴李刚刘佳袁雪飞
Owner WIDE SPACE PHASE CHANGE TECH
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