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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 stratification problem, and stratification still existed after repeated phase transitions, which led to the attenuation of the latent heat value of the phase transition, and the attenuation range ranged from 20 to 50%.

Method used

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  • Sodium sulfate decahydrate phase change energy storage material compositions

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0023] Table 1 Effect of composition and dosage of nucleating agent on undercooling degree of phase change material

[0024]

Embodiment 2

[0026] Add 360g of water into an airtight container and heat it to 40°C, then add 284g of anhydrous Na 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 evenly, 26.83g of lithium-based bentonite and 5.37g of carboxymethylcellulose were successively added, and the 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 supercooling was 2.5° C., and the latent heat of phase transition was 215.3 kJ / kg. After 3000 times of cold and heat cycle tests, the latent heat value of phase transition was 210.7kJ / kg, and no Na appeared visually when it was higher than the crystallization temperature. 2 SO 4 Substantial settlement.

Embodiment 3

[0028] Add 72g of water into an airtight container and heat it to 40°C, then add 56.8g of anhydrous Na 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 evenly, successively add 11.45g of calcium-based bentonite and 1.43g of carboxyethyl cellulose, and continue stirring for 1 hour at 40°C. The phase transition temperature of the obtained mixture was measured to be 31.0° C., the supercooling degree was 2.1° C., and the phase transition latent heat value was 210.3 kJ / kg. After 3000 times of cold and heat cycle tests, the latent heat value of phase transition is 209.7kJ / kg, and no Na appears visually when it is higher than the crystallization temperature. 2 SO 4 Substantial 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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