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Inorganic hydrated salt expanded graphite composite phase-changing heat storage material and preparation method thereof

A technology of inorganic hydrated salt and expanded graphite, which is applied in the direction of heat exchange materials, chemical instruments and methods, and can solve problems such as supercooling, low thermal conductivity, and phase delamination

Inactive Publication Date: 2010-08-18
ENG COLLEGE OF ENG CORPS PLA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the problems to be solved in the above-mentioned prior art, the purpose of this invention is to propose a set of additive formulations to improve the phase transition performance of inorganic hydrated salt sodium acetate trihydrate, to solve the supercooling and phase delamination that it exists in the heat storage process and low thermal conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] An inorganic hydrated salt expanded graphite composite phase-change heat storage material according to the present invention, the phase-change material is mixed according to the following mass: 20 grams of analytically pure sodium acetate trihydrate, 1.24 g of disodium hydrogen phosphate dodecahydrate, carboxymethyl Base cellulose (or carboxymethyl starch) 0.64g, its mass ratio is 100: 6.2: 3.2.

[0016] When preparing, heat the mixture mixed according to the above ratio until it is completely melted, and stir it evenly to form a eutectic mixture. Take 0.9 g of dried expandable graphite particles and place them in a muffle furnace with a temperature of 700 ° C. Medium heat treatment for 50 seconds, then take it out, add expanded graphite into the eutectic mixture, stir evenly in liquid state, after adsorption for 1 hour, cool naturally to obtain inorganic hydrate salt expanded graphite composite phase change heat storage material. Take the sample of the above-mentioned ...

Embodiment 2

[0018] Another inorganic hydrated salt expanded graphite composite phase-change heat storage material according to the present invention, the phase-change material is mixed according to the following mass: 20 grams of analytically pure sodium acetate trihydrate, 1.2 g of disodium hydrogen phosphate dodecahydrate, carboxylate 0.70 g of methyl cellulose, and its mass ratio is 100:6:3.5.

[0019] When preparing, heat the mixture mixed according to the above ratio until it is completely melted, stir it evenly to form a eutectic mixture, take 1g of dried expandable graphite particles, and place them in a muffle furnace at a temperature of 700°C for heat treatment 50 seconds, then take it out, add the expanded graphite into the eutectic mixture, stir evenly in the liquid state, absorb it for 1 hour, and cool naturally to obtain the inorganic hydrate salt expanded graphite composite phase change heat storage material. It is determined by experiments that the latent heat of phase tran...

Embodiment 3

[0021] Another inorganic hydrated salt expanded graphite composite phase change heat storage material according to the present invention, the phase change material is mixed according to the following mass: 5 kg of analytically pure sodium acetate trihydrate, 0.3 kg of disodium hydrogen phosphate dodecahydrate, carboxylate 0.15 kg of methyl cellulose, and its mass ratio is 100:6:3. When preparing, heat the mixture mixed according to the above ratio until it is completely melted, and stir it evenly to form a eutectic mixture. Take 0.2kg of dried expandable graphite particles and place them in a muffle furnace at a temperature of 700°C. Heat treatment for 1 minute, then take it out, add the expanded graphite into the eutectic mixture, stir evenly in the liquid state, after absorbing for 1 hour, pour the liquid eutectic mixture into a square flat mold to cool naturally, and press at the same time to form Squares of solid phase composite phase change materials. The thermal conduct...

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Abstract

The invention relates to an inorganic hydrated salt expanded graphite composite phase-changing heat storage material. In the preparation method thereof, 85-89 mass parts of inorganic hydrated salt sodium acetate trihydrate as a heat storage matrix, 5.5-6.5 mass parts of disodium hydrogenphosphate as a nucleating agent, 2.5-3.5 mass parts of carboxymethyl cellulose as a thickening agent, and 3-4.5 mass parts of expanded graphite is blended in an inorganic hydrated salt mixture as a material with a high thermal conductivity. Due to the use of the expanded graphite, the material not only maintains excellent properties of natural flake graphite such as good thermal conductivity, no toxicity and the like, but also has adsorbability which the natural flake graphite does not have. The invention solves the problems of sub-cooling degree, phase stratification and low thermal conductivity during the heat storage process. The composite phase-changing material has a low sub-cooling degree after the phase changing performance is improved, the solution thereof is uniform without sedimentation and stratification during the solid-liquid phase change, the performance is stable, the repeatability of good, and the phase-changing heat storage can be enhanced through improving the thermal conductivity of the material.

Description

1. Technical field [0001] The invention relates to a composite phase change heat storage material, in particular to an inorganic hydrate salt expanded graphite composite phase change material and a preparation method thereof. 2. Background technology [0002] Phase change heat storage materials (PCM) are more and more widely used in solar heating, aerospace, peak shifting of heat load, new energy-saving building materials, waste heat recovery and air conditioning technology. Especially the latent heat energy storage technology is very popular because of its simple device, small size, flexible design, convenient use and easy management. Among the many latent heat energy storage materials, paraffin wax, fatty acid, inorganic hydrated salts and other materials are mainly used. Among them, inorganic hydrated salt is a very important type of medium and low temperature phase change heat storage materials. It can provide a variety of phase change materials with melting points rang...

Claims

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Application Information

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IPC IPC(8): C09K5/06
Inventor 茅靳丰韩旭李伟华李金田刁孝发马天宝
Owner ENG COLLEGE OF ENG CORPS PLA UNIV OF SCI & TECH
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