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Ultralow temperature energy storage material composition

A technology of energy storage materials and compositions, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve problems such as crystallization temperature fluctuations, serious latent heat attenuation, performance discounts, etc., and achieve the effect of high melting latent heat

Active Publication Date: 2012-10-24
BEIJING JINGXIN XIANGNENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The second is its precipitation problem. At about -40°C, the solubility of magnesium chloride and calcium nitrate in water is very small, which makes excessive magnesium chloride and calcium nitrate precipitate from the aqueous solution. Therefore, magnesium chloride and calcium nitrate cannot be completely dissolved in water. At this time, the interior of the energy storage material is not uniform, and the components in the liquid phase change, resulting in a large change in the crystallization temperature. After repeated energy storage, the latent heat decay will become more and more serious, and the performance will be greatly reduced.

Method used

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  • Ultralow temperature energy storage material composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Cool 1299 grams of water to 0-5°C, then add 260 grams of MgCl 2 , 325 g Ca(NO 3 ) 2 , 60 grams of NaCl, 10 grams of Mg(OH) 2 · MgCO 3 , 16 grams of sodium carboxymethylcellulose (CMC), and 30 grams of KCl were added to water successively, and the mixing and stirring time was 12 hours. 2 Add water and start to keep the solution temperature at -5-0°C, stir at a constant speed for 3 hours, then keep the solution temperature at -15-10°C, and store it statically below -20°C for 72 hours after the stirring is completed. According to the step cooling curve method, the crystallization temperature is -50.2°C, the supercooling degree is 2°C, and the latent heat of fusion is 301kJ / L. There is no obvious layering and precipitation under the condition of 48 hours and 20°C, and the system is relatively stable.

Embodiment 2

[0017] Cool 568.8 grams of water to 0-5°C, then add 200 grams of MgCl 2 , 166.7 g Ca(NO 3 ) 2 , 4.5 grams of NaCl, 15 grams of Mg(OH) 2 · MgCO 3 , 25 grams of sodium carboxymethylcellulose (CMC), and 20 grams of KCl were added to water successively, and the mixing and stirring time was 12 hours. 2 Add water and start to keep the solution temperature at -5-0°C, stir at a constant speed for 3 hours, then keep the solution temperature at -15-10°C, and store it statically below -20°C for 72 hours after the stirring is completed. According to the step cooling curve method, the crystallization temperature is -50.1°C, the supercooling degree is 2.1°C, and the latent heat of fusion is 302kJ / L. There is no obvious layering and precipitation under the condition of 48 hours and 20°C, and the system is relatively stable.

Embodiment 3

[0019] Cool 50.8 kg of water to 0-5°C, then add 21 kg of MgCl 2 , 21 kg Ca(NO 3 ) 2 , 2 kg NaCl, 1 kg Mg(OH) 2 · MgCO 3 , 1.2 kilograms of sodium carboxymethylcellulose (CMC), and 3 kilograms of KCl were added to water successively, and the mixing and stirring time was 12 hours. 2 Add water and start to keep the solution temperature at -5-0°C, stir at a constant speed for 3 hours, then keep the solution temperature at -15-10°C, and store it statically below -20°C for 72 hours after the stirring is completed. According to the step cooling curve method, the crystallization temperature is -50.3°C, the supercooling degree is 2°C, and the latent heat of fusion is 299kJ / L. There is no obvious layering and precipitation under the condition of 48 hours and 20°C, and the system is relatively stable.

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Abstract

The invention discloses an energy storage material composition formed by mixing eutectic salts with magnesium chloride, calcium nitrate and water as the principal components. The energy storage material composition is mainly prepared from water, magnesium chloride, calcium nitrate, sodium chloride, potassium chloride, basic magnesium carbonate and sodium carboxymethylcellulose, wherein the crystallization temperature is -48 to -52 DEG C, and the latent heat of fusion is more than 300 kJ / L.

Description

technical field [0001] The invention relates to an ultra-low temperature energy storage material composition, which has a crystallization temperature of -48 to -52°C and has relatively high melting latent heat. After adding a certain proportion of functional additives, it overcomes the problem of energy storage performance attenuation caused by the high supercooling degree of the mixture of magnesium chloride, calcium nitrate, and eutectic salt, and easy salt precipitation. The energy storage material composition obtained according to the present invention can keep the temperature of a local space at about -50°C in a normal temperature environment, and is suitable for ultra-low temperature freezing, ultra-low temperature transportation and other fields. Background technique [0002] When a substance melts or crystallizes, it will be accompanied by the absorption or release of heat. For example, liquid water will release a large amount of heat energy at 0°C and transform into...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 程绍海
Owner BEIJING JINGXIN XIANGNENG TECH
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