A 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 high price, poor thermal conductivity, dangerous and flammable, etc., and achieve stable maintenance, stable phase transition temperature, and phase transition with temperature. change-sensitive effects

Active Publication Date: 2019-09-24
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • 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

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Embodiment 1

[0021] 76 grams of sodium acetate trihydrate and 4 grams of potassium fluoride dihydrate that can form a eutectic mixture are mixed, heated and melted to obtain 80 grams of mixed solution, and 4 g of carboxymethyl cellulose is added to mix evenly. The liquid is placed in a closed container, and the container is Placed in an air environment of 30°C, the measured temperature change of the medium is as follows: figure 1 As shown by the thick line, it can be seen that the phase transition of the system begins to occur when the temperature drops to around 49.5°C, and an obvious temperature plateau appears at around 51°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 70°C to raise the temperature, and it can be observed that there is a temperature rise platform for the medium at 51°C...

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Abstract

The invention discloses a phase-change energy storage medium which is a mixture composed of water, natrium aceticum, potassium fluoride and carboxymethylcellulose. Water, natrium aceticum and potassium fluoride have composites for forming a eutectic mixture. A preparation method includes the step of mixing, heating and completely melting all the components in proportion to be evenly stirred, wherein the liquid phase can be used as the phase-change energy storage medium. The medium has the phase-change temperature of about 51 DEG C, and has the advantages of being environmentally friendly, low in 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, the normal and low temperature phase change heat storage materials are materials with a phase change temperature Tm in the range of -50-90°C, and 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 to stor...

Claims

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Application Information

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