Phase change energy storage medium

A phase change energy storage and energy storage medium technology, applied in the field of energy conservation and environmental protection, can solve the problems of poor thermal conductivity, dangerous and flammable, and expensive, and achieve stable phase transition temperature point, phase transition is sensitive to temperature changes, maintain a stable effect

Active Publication Date: 2016-01-13
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
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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

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Embodiment 1

[0020] 70 grams of disodium hydrogen phosphate dodecahydrate, 8 grams of sodium silicate and 2 sodium acetates were mixed and heated to melt to obtain 80 grams of mixed solution, and the liquid was placed in a closed container, and the container was placed in an air environment at 15°C. The temperature change of the measured medium is as figure 1 As shown by the thick line, it can be seen that when the temperature drops to 29.7°C, the phase transition of the system begins to occur, and an obvious temperature plateau appears at about 32°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 50°C to raise the temperature, and it can be observed that there is a temperature rise platform in the medium at 32°C, which means that the medium absorbs a large amount of heat from the environmen...

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Abstract

The invention discloses a room-temperature phase change energy storage medium which is a eutectic mixture composed of water, disodium hydrogen phosphate, sodium silicate and sodium acetate. A preparation method of the phase change energy storage medium comprises the following steps: the components are mixed according to the formula and are heated until completely molten; the mixture is well mixed, and the liquid phase can be used as the phase change energy storage medium. The phase change temperature of phase change energy storage medium is close to room temperature. The phase change energy storage medium also has the advantages of environment-friendly materials, low cost, and the like.

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
Inventor 董欧阳周园李翔申月海春喜
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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