Phase-change energy storage medium

A technology of phase change energy storage and energy storage medium, which is applied in the field of energy saving and environmental protection, can solve the problems of high price, danger and flammability, poor thermal conductivity, etc., and achieve stability, phase change temperature point stability, and phase change with temperature Change Sensitive Effects

Inactive Publication Date: 2016-12-14
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the organic substances currently used as room temperature phase change energy storage materials have the disadvantages of being dangerous, flammable, expensive, and poor thermal conductivity; anhydrous molten salts are suitable for high temperature heat storage; salt water compounds and their mixtures are suitable for storing low temperature heat sources, these The material has a wide range of applications in solar energy and urban waste heat utilization, peak shaving and valley filling of the power grid, etc.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Mix 72 grams of calcium chloride hexahydrate, 6 grams of magnesium chloride hexahydrate, and 2 grams of magnesium nitrate hexahydrate, heat and melt to obtain 80 grams of mixed solution, add 1 g of strontium chloride hexahydrate and 4 g of CMC to the liquid, stir evenly and put it in a closed container , the container is placed in an air environment of 13°C, and the temperature change of the medium is measured as follows: figure 1 As shown by the thick line, it can be seen that when the temperature drops to 25°C, the phase transition of the system begins to occur, and an obvious temperature plateau appears at around 25.2°C. This is because the solidification of the medium at this temperature releases a large amount of heat to the environment, thus Maintain the stability of its own temperature. Then put the container containing the energy storage medium in an environment of 38°C to heat up, and it can be observed that there is a temperature rise platform for the medium a...

Embodiment 2

[0029] Mix 72 grams of calcium chloride hexahydrate, 5.6 grams of magnesium chloride hexahydrate, and 2.4 grams of magnesium nitrate hexahydrate, heat and melt to obtain 80 grams of mixed solution, add 1.2 grams of strontium chloride hexahydrate and 3 g of CMC to the liquid, stir evenly and put it in a closed In the container, the container is placed in the air environment of 13 °C, and the temperature change of the medium is measured as follows: figure 2 As shown by the thick line, it can be seen that when the temperature drops to 23.6°C, the phase transition of the system begins to occur, and an obvious temperature plateau appears at around 25.1°C. This is because the solidification of the medium at this temperature releases a large amount of heat to the environment. Maintain the stability of its own temperature. Then put the container containing the energy storage medium in an environment of 38°C to heat up, and it can be observed that there is a temperature rise platform ...

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Abstract

The invention disclose a room temperature phase-change energy storage medium. The phase-change energy storage medium comprises a eutectic mixture composed of water, calcium chloride, magnesium chloride and magnesium nitrate. The preparation method of the phase-change energy storage medium comprises the following steps: mixing and heating the above components according to proportion, completely melting, uniformly stirring, and adding a certain amount of strontium chloride hexahydrate and carboxymethyl cellulose, namely, the liquid phase can be used as the phase-change energy storage medium. The phase-change energy storage medium disclosed by the invention has the features that the phase-change temperature is close to room temperature, the material is environmentally friendly and the cost is low.

Description

technical field [0001] The invention relates to the field of energy saving and environmental protection, in particular to a phase change energy storage medium that stores heat energy in a phase change form. Background technique [0002] Generally, materials with a phase change temperature Tm in the range of -50-90°C are classified as normal and low temperature phase change heat storage materials. Such materials are widely used in construction and daily life. Materials with a phase change temperature lower than 15°C are mainly used in air-conditioning and refrigeration, while materials with a phase change temperature between 15-90°C are widely used in the fields of solar heat storage and heat load. [0003] The mechanism of action of normal and low temperature phase change energy storage materials is: when the temperature is slightly higher than the phase change temperature, the phase change energy storage medium absorbs a large amount of heat from the environment and melts t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/06
Inventor 董欧阳周园申月李翔海春喜
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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