High-performance moderate-temperature phase-change energy-storage material and preparation method thereof

An energy storage material and high-performance technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the problems of supercooling and phase separation, lack of medium temperature phase change materials, etc., and achieve stable exothermic process, easy operation, good stability effect

Inactive Publication Date: 2013-04-17
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic phase change heat storage materials have high energy storage heat per unit volume and good thermal conductivity, but usually have the problems of supercooling and phase separation. If the above problems can be improved by using appropriate methods, inorganic phase change energy storage materials will has a very obvious advantage
[0004] In real life, medium temperature phase change materials between 30°C and 40°C are widely used, but there are relatively few medium temperature phase change materials of inorganic hydrated salts that can be developed and utilized at present.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high-performance medium-temperature phase-change energy storage material, its constituent materials and weights are:

[0027] Disodium hydrogen phosphate dodecahydrate: 95.25g;

[0028] Sodium metasilicate nonahydrate: 4.75 g.

[0029] The chemical components used in this embodiment need to be sealed and stored, especially disodium hydrogen phosphate dodecahydrate exposed to the air at room temperature is prone to weathering and loses crystal water, which seriously affects its performance. The materials used in the present invention can all be packed in packages that can meet the sealing requirements when leaving the factory, so it is only necessary to pay attention not to damage the outer package during transportation.

[0030] The preparation method of the above medium-temperature phase-change energy storage material includes the following steps: first, heat disodium hydrogen phosphate dodecahydrate at 60°C to 70°C until it is completely melted; then add sodium sil...

Embodiment 2

[0036] A high-performance medium-temperature phase-change energy storage material, its constituent materials and weights are:

[0037] Disodium hydrogen phosphate dodecahydrate: 95.50 g;

[0038] Sodium carboxymethylcellulose: 4.50 g.

[0039] Its preparation method and precautions are the same as in Example 1.

[0040] The phase-change energy storage material produced according to the above formula and process is milky white, and viscous in liquid state. The latent heat of phase transition of this material is greater than 220 J / g, and the phase transition temperature is around 36°C.

Embodiment 3

[0042] A high-performance medium-temperature phase-change energy storage material, its constituent materials and weights are:

[0043] Disodium hydrogen phosphate dodecahydrate: 94.54 g;

[0044] Sodium carboxymethylcellulose: 4.46 g;

[0045] Sodium polyacrylate: 1.00 g.

[0046] Its preparation method and precautions are the same as in Example 1.

[0047] The phase-change energy storage material produced according to the above formula and process is milky white, and viscous in liquid state. The latent heat of phase transition of this material is greater than 220 J / g, and the phase transition temperature is around 36°C.

[0048] The phase-change energy storage materials obtained by the above three technical formulas have been tested repeatedly and have stable performance, with an undercooling degree of less than 3°C and no phase separation. The mass percentage of the above-mentioned formula additives is small, and has little influence on the energy storage of the main mat...

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Abstract

The invention relates to a high-performance moderate-temperature inorganic phase-change energy-storage material and a preparation method thereof. The material comprises the following components by weight percent: 95-99% of sodium phosphate dibasic dodecahydrate and 1-5% of sodium salt additive, wherein the sodium salt additive comprises sodium metasilicate nonahydrate, sodium salt of carboxy methyl-cellulose and sodium polyacrylate. According to the invention, as an improvement of a traditional inorganic phase-change energy-storage material, the material provided by the invention has larger phase change latent heat larger than 210 J / g and appropriate phase change temperature 30-40 DEG C, is an energy storage material with good performance within the temperature range, and has a wide application prospect.

Description

technical field [0001] The invention relates to a phase-change energy storage material, in particular to a high-performance medium-temperature phase-change energy storage material and a preparation method thereof. Background technique [0002] Phase change energy storage materials can exchange energy with the environment during the phase change process, absorb or release a large amount of latent heat of phase change, which can effectively alleviate the problem of energy supply and demand imbalance in space and time, and play a role in improving energy utilization. Compared with sensible heat energy storage, phase change energy storage has the advantages of constant temperature control, wide selection range of phase change temperature, high energy storage density, remarkable energy saving effect, and easy control. It is widely used in heating and air conditioning, heat storage buildings, solar energy utilization, Power supply system optimization, aerospace and extreme environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 邓天龙李雪璐高道林刘环郭亚飞王士强余晓平徐占武魏炳举李玉婷林陈晓
Owner TIANJIN UNIV OF SCI & TECH
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