Composite phase change heat storage material and preparation method thereof

A heat storage material and composite phase change technology, applied in the direction of heat exchange materials, chemical instruments and methods, etc., can solve the undisclosed problems such as the preparation method of sodium sulfate decahydrate heat storage phase change materials

Inactive Publication Date: 2013-07-10
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above schemes still do not disclose the thermal storage phase change material com

Method used

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  • Composite phase change heat storage material and preparation method thereof

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preparation example Construction

[0010] The composite phase change heat storage material of the present invention is characterized in that the main constituent materials are expanded perlite as the adsorption carrier, sodium sulfate decahydrate as the heat storage matrix, and industrial solid paraffin as the coating sealing material. Among them, the expanded perlite must be calcined at high temperature; in order to facilitate the adsorption of sodium sulfate decahydrate on the carrier, it is prepared as a saturated aqueous solution at 40°C. Finally, in order to reduce the loss of hydrated salt crystallization water during the phase change process and prolong the service life of the thermal storage material, industrial solid paraffin is used to coat and seal the periphery of the material, and a certain amount of thermally conductive filler is added during the coating process. In order to improve the overall thermal conductivity of the material and enhance its thermal response capability. The mass composition o...

Embodiment 1

[0017] At 40°C, 40.3 parts of sodium sulfate decahydrate and 13.9 parts of distilled water were mixed and melted in a beaker. Place 0.8 parts of borax and 1.2 parts of sodium carboxymethyl cellulose in a mortar, grind them finely, add them into the blended molten liquid and mix evenly.

[0018] Take 18.6 parts of expanded perlite that has been calcined at a high temperature above 450°C and add it to the mixed solution prepared in the previous step, stir and adsorb and blend for 1 hour under the condition of a sealed 40°C and a vacuum of 150kpa. After the adsorption is complete, gradually cool to room temperature.

[0019] Mix and melt 24 parts of solid paraffin and 1.2 parts of expandable graphite at a temperature higher than the melting point of paraffin, and use conventional methods to make the molten liquid form a solid sealing layer on the surface of the heat storage material prepared in the previous step to obtain a composite Phase change thermal storage materials. A sam...

Embodiment 2

[0021] At 40°C, 39.8 parts of sodium sulfate decahydrate and 13.7 parts of distilled water were mixed and melted in a beaker. Put 1.1 parts of nano-alumina and 1.6 parts of sodium carboxymethyl cellulose in a mortar, grind them finely, add them into the blended melt and mix evenly.

[0022] Take 18.1 parts of expanded perlite that has been calcined at a high temperature above 450°C and add it to the mixed solution prepared in the previous step. Stir and adsorb and blend for 1.5 hours under the condition of a sealed 45°C and a vacuum of 175kpa. After the adsorption is complete, gradually cool to room temperature.

[0023] Mix and melt 23.9 parts of solid paraffin and 1.8 parts of silicon carbide at a temperature higher than the melting point of paraffin, and use conventional methods to make the molten liquid form a solid sealing layer on the surface of the heat storage material prepared in the previous step to obtain a composite phase heat storage material. A sample of the abo...

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Abstract

The invention discloses a composite phase change heat storage material and a preparation method thereof. The composite phase change heat storage material is characterized by comprising the following materials in parts by weight: 39.4-40.3 parts of saturated sodium sulfate decahydrate solution, 0.8-1.2 part of nucleating agent, 1.2-2 parts of thickening agent, 23.6-24.0 parts of solid paraffin, 1.2-2.4 parts of heat-conducting filler, 17.8-18.6 parts of expanded perlite and 13.6-13.9 parts of distilled water, wherein a 40 DEG C saturated sodium sulfate decahydrate solution containing the nucleating agent and the thickening agent is adsorbed into the expanded perlite by employing a vacuum absorption method and then is sealed by employing industrial solid paraffin after adsorption is finished, and the heat-conducting filler is added in the sealing process. The composite phase change heat storage material has the advantages that after being modified and micro-packaged, the composite phase change heat storage material has low supercooling degree, the solution is uniform and not layered during solid-liquid phase change, the performance is stable, the repeatability is high, the service life is prolonged, and the composite phase change heat storage material can be widely applied to actual building energy conservation engineering.

Description

[0001] Field [0002] The invention relates to a composite phase-change thermal storage material for building wall energy saving, in particular to a composite phase-change thermal storage material of decahydrate sulfuric acid, industrial solid paraffin and expanded perlite and a preparation method thereof. Background technique [0003] With the development of industry, global energy consumption continues to increase, and building energy consumption has become an important part of the total energy consumption of the whole society. For example, in some developed countries, building energy consumption accounts for 30%-40% of the total energy consumption of the society. my country's building energy consumption accounts for about 1 / 4 of the country's total energy consumption, ranking first in energy consumption. The development of building energy storage materials to realize the energy saving of buildings has become the focus of research at home and abroad. Phase change materials...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 管学茂朱建平张建武宋纤纤张海波
Owner HENAN POLYTECHNIC UNIV
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