Sodium sulfate decahydrate 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., can solve the problems of not completely solving the problem of delamination, delamination phenomenon, phase change latent heat value attenuation, etc., and achieve excellent Effect of temperature regulation function, high phase transition stability, high heat storage density

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

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Problems solved by technology

[0010] Its nucleating agent of researched sodium sulfate decahydrate in above-mentioned each invention and document is all based on Na 4 B 2 o 7 .10H 2 O, the thickener used did not completely solve the strat

Method used

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  • Sodium sulfate decahydrate phase change energy storage material compositions

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1

[0022] First take anhydrous Na 2 SO 4 It is made into Na at a temperature of 40℃ with a ratio of 1:10 to water massage 2 SO 4 Saturated solution and solid Na 2 SO 4 mixture. The nucleating agent composition was dissolved in 100 g of the above mixture while maintaining 40° C. and stirring conditions, and the stirring time was 1 hour. Test its supercooling degree according to the T-History test method, and the cooling environment is a constant temperature water bath at 25°C. The analysis results are shown in Table 1:

[0023] Table 1 The influence of nucleating agent composition and dosage on the subcooling degree of phase change material

[0024]

Example Embodiment

[0025] Example 2

[0026] Add 360g of water into a closed container and heat it to 40°C, and add 284g of anhydrous Na in sequence while maintaining 40°C and stirring. 2 SO 4 , 6.44g Na 4 B 2 O 7 ·10H 2 O, 12.88g CaSO 4 , 3.86gNaBr, 0.32g(NaPO 3 ) 6 After stirring uniformly, 26.83g lithium bentonite and 5.37g carboxymethyl cellulose were added successively, and stirring was continued for 1 hour at 40°C. The phase transition temperature of the obtained mixture was measured to be 31.7°C, the degree of subcooling was 2.5°C, and the latent heat of phase transition was 215.3kJ / kg. The latent heat value of phase change is 210.7kJ / kg measured after 3000 heat and cold cycle tests, and no Na appears visually when the temperature is higher than the crystallization temperature. 2 SO 4 A lot of settlement.

Example Embodiment

[0027] Example 3

[0028] Add 72g of water into a closed container and heat it to 40°C. While keeping at 40°C and stirring, add 56.8g of anhydrous Na in turn 2 SO 4 , 3.22g Na 4 B 2 O 7 ·10H 2 O, 3.22g BaSO 4 , 2.58g NaBr, 0.13g(NaPO 3 ) 6 After stirring uniformly, 11.45g calcium bentonite and 1.43g carboxyethyl cellulose are added successively, and stirring is continued for 1 hour at 40°C. The phase transition temperature of the obtained mixture was measured to be 31.0°C, the degree of subcooling was 2.1°C, and the latent heat of phase transition was 210.3kJ / kg. The latent heat value of phase change is 209.7kJ / kg after 3000 heat and cold cycle tests, and no Na appears visually when it is higher than the crystallization temperature. 2 SO 4 A lot of settlement.

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Abstract

The invention discloses sodium sulfate decahydrate phase change energy storage material compositions. The compositions mainly comprises sodium sulfate decahydrate, a nucleating agent, a thickening agent and the like; and the phase change temperature is between 30 and 32 DEG C, the degree of supercooling is less than 3 DEG C and the phase change latent heat is more than 220kJ/kg. The compositions have quite good phase change stability and have passed 3,000 times of cold and heat cycle tests; moreover, the uniformity of the phase change system can be maintained for a long time.

Description

technical field [0001] The invention relates to a phase change energy storage material composition, which has a phase change temperature of 30-32°C and an undercooling degree of less than 3°C. The phase change latent heat value of the phase change energy storage material can reach more than 200kJ / kg, and has relatively high High heat storage density, thus showing excellent temperature regulation function. 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 the fields of solar heat storage, waste heat recovery, indoor temperature regulation and the like. 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 difference...

Claims

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Application Information

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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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