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Stearic acid-based high-performance medium-temperature phase change energy storage material and preparation method thereof

A phase change energy storage material, stearic acid technology, applied in heat exchange materials, chemical instruments and methods, etc., can solve problems such as phase transition point drift, achieve stable exothermic process, easy encapsulation, and suitable phase transition temperature Effect

Inactive Publication Date: 2012-11-21
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Phase change energy storage materials are mainly divided into organic phase change energy storage materials and inorganic phase change energy storage materials. The former has higher energy storage heat per unit volume and good thermal conductivity, but there are serious supercooling and phase separation phenomena, while Organic phase change energy storage materials have stable performance, a wide range of phase change temperatures, and almost no supercooling and phase separation during the exothermic process, so the advantages are very obvious
[0004] At present, there are few studies on organic phase change energy storage materials. The phase transition temperature of stearic acid has been found to be 55°C, which has a relatively high phase change latent heat (191J / g), and the exothermic process does not occur excessively. Cold and phase separation phenomenon, but in the process of multiple cycles, there is an obvious drift of phase transition point

Method used

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  • Stearic acid-based high-performance medium-temperature phase change energy storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A stearic acid-based high-performance medium-temperature organic phase-change energy storage material, the constituent raw materials and their weight percentages are:

[0027] Pure stearic acid: 95%;

[0028] Palmitic acid; 5%.

[0029] The chemical components used in this embodiment need to be sealed and stored to avoid affecting the performance due to volatilization of substances during application. The packaging used by the selected raw materials in the present invention can meet the sealing requirements when leaving the factory, so it is only necessary to pay attention not to damage the outer packaging during transportation.

[0030] A method for preparing a medium-temperature phase-change energy storage material, comprising the following steps:

[0031] (1) Mix pure stearic acid and palmitic acid according to the weight ratio, and heat at a temperature not higher than 80°C until completely melted;

[0032] ⑵Continuously stir to make it fully mixed into a fluid s...

Embodiment 2

[0039] A stearic acid-based high-performance medium-temperature organic phase-change energy storage material, the constituent raw materials and their weight percentages are:

[0040] Pure stearic acid: 90%;

[0041] Lauric Acid: 10%.

[0042] Its preparation method and precautions are the same as in Example 1.

[0043] The phase change energy storage material produced according to the above formula and process is milky white and transparent in liquid state. The latent heat of phase transition of this material is relatively high (greater than 190J / g), and the phase transition temperature is 48°C.

Embodiment 3

[0045] A stearic acid-based high-performance medium-temperature organic phase-change energy storage material, the constituent raw materials and their weight percentages are:

[0046] Pure stearic acid: 86%;

[0047] Acetamide: 14%.

[0048] Its preparation method and precautions are the same as in Example 1.

[0049] The phase change energy storage material produced according to the above formula and process is milky white and transparent in liquid state. The latent heat of phase transition of this material is high (greater than 200J / g), and the phase transition temperature is 46°C.

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Abstract

The invention relates to a stearic acid-based high-performance medium-temperature phase change energy storage material, which comprises the following raw materials by weight: 39-95% of pure stearic acid; and 5-61% of an additive. The preparation method comprises the following steps of: (1) mixing the pure stearic acid with the additive, and melting the mixture completely under a temperature condition of lower than or equal to 80DEG C; (2) carrying out stirring and mixing the materials fully and uniformly; and (3) performing packaging. The medium-temperature phase change energy storage material provided in the invention has the advantages of abundant raw materials, simple preparation, as well as great phase change latent heat (160J / g-220J / g), and can be applied to temperature regulation and thermal energy storage in a temperature range of 30-70DEG C, and especially has broad application prospects in daily necessity heat preservation, water heater energy storage, temperature control and regulation of electrical equipment and other aspects.

Description

technical field [0001] The invention relates to a phase-change energy storage material, in particular to a stearic acid-based high-performance medium-temperature organic phase-change energy storage material and a preparation method thereof. Background technique [0002] Phase change energy storage materials are a special kind of functional materials. During the phase change process, phase change energy storage materials exchange energy with the environment, absorb or release a large amount of latent heat of phase change, and solve the mismatch between energy supply and demand in time and space. problem, thereby effectively improving energy utilization. Compared with sensible heat energy storage, phase change energy storage has the advantages of high energy storage density, constant temperature control, remarkable energy saving effect, wide selection range of phase change temperature, and easy control. It is widely used in aerospace, solar energy utilization, heating and air ...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 邓天龙李雪璐李玉婷高道林郭亚飞王士强
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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