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Composite phase change material and its preparation method and building material

A technology for composite phase change materials and building materials, applied in the field of building materials, composite phase change materials and their preparation, can solve the problems of liquid leakage, strong subcooling, low heat storage and release efficiency, etc. The effect of heat and exotherm enhancement

Inactive Publication Date: 2017-07-25
ENN ENERGY SERVICE
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The invention provides a composite phase change material and its preparation method and a building material, which are used to solve the problem of calcium chloride hexahydrate used as a phase change material in the prior art due to its strong supercooling degree and low thermal conductivity. The resulting heat storage and release efficiency is low, and the technical problem of liquid leakage during solid-liquid transition due to the large fluidity, in order to improve the heat storage and release efficiency and thermal stability of calcium chloride hexahydrate as a phase change material technical effect

Method used

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  • Composite phase change material and its preparation method and building material
  • Composite phase change material and its preparation method and building material
  • Composite phase change material and its preparation method and building material

Examples

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Embodiment 1～9

[0041] Weigh 4.3495g of distilled water and weigh 4.4705 grams of anhydrous calcium chloride. Since anhydrous calcium chloride has strong water absorption, it is quickly poured into the previously weighed distilled water to dissolve after the weighing is completed. While dissolving, 0.18 g of strontium chloride hexahydrate was added thereto. Finally, 1 g of expanded graphite (adsorption rate: 90%) was added to the above mixed solution, stirred with a glass rod for 10 min, and mixed evenly to obtain a composite phase change material.

[0042] The preparation method of expanded graphite is as follows: unexpanded graphite of a certain size is obtained after being heated and expanded for a certain period of time under a certain heating power. The expanded graphite in Examples 1-9 were respectively prepared according to the parameter conditions shown in Table 1, and the corresponding phase transition temperature, phase transition enthalpy and thermal conductivity are also shown in ...

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Abstract

The invention relates to the field of phase change materials and particularly relates to a composite phase change material and its preparation method and a building material. The composite phase change material comprises calcium chloride hexahydrate, a subcooling degree reducing agent and a thermal conductivity enhancer. A mass part ratio of the calcium chloride hexahydrate, subcooling degree reducing agent to thermal conductivity enhancer is 100: 1-5: 10-20. The thermal conductivity enhancer is expanded graphite or a carbon fiber. The subcooling degree reducing agent is used for reducing a subcooling degree of calcium chloride hexahydrate. The thermal conductivity enhancer ensures that the thermal conductivity coefficient of the composite phase change material is greater than that of the calcium chloride hexahydrate.

Description

technical field [0001] The invention relates to the field of phase change materials, in particular to a composite phase change material, a preparation method thereof and a building material. Background technique [0002] With the shortage of energy, heat storage technology has increasingly become the focus of research. The use of heat storage technology can integrate intermittent energy and store it in the form of thermal energy for use when needed. Latent heat storage technology is a widely used heat storage technology at present. It mainly stores energy through the change of enthalpy in the phase transition process of phase change materials, so it is also called phase change heat storage technology. Phase change heat storage technology has the advantages of high energy storage density, small temperature fluctuation during heat storage and release, can be controlled in the phase change temperature range, provides a relatively stable heat source, and has the advantages of si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06C04B22/12
CPCC04B40/0039C09K5/063C04B22/002C04B22/124C04B14/024
Inventor 冯子桐薛康
Owner ENN ENERGY SERVICE
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