Method for improving thermal performance of eutectic hydrated salt phase change material and modified product of eutectic hydrated salt phase change material

A technology of eutectic hydration and thermal performance, applied in the field of material chemistry, can solve the problems of latent heat and high degree of supercooling of hydrated salt phase change materials of phase separation and phase separation, achieve high heat storage density, low degree of supercooling, and improve thermal performance Effect

Pending Publication Date: 2022-08-02
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

[0004] In order to overcome the above-mentioned problems existing in the prior art, the object of the present invention is to provide a method for improving the thermal performance of the eutectic hydrated salt phase change material and its modified product, and to improve the phase change of the eutectic hydrated salt by using multiple modifiers The thermal performance of the material can alleviate the problems of high supercooling degree, serious phase separation and latent heat drop compared with the single hydrated salt phase change material in the use process of the existing eutectic hydrated salt

Method used

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  • Method for improving thermal performance of eutectic hydrated salt phase change material and modified product of eutectic hydrated salt phase change material
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  • Method for improving thermal performance of eutectic hydrated salt phase change material and modified product of eutectic hydrated salt phase change material

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preparation example Construction

[0047] The preparation method of the modified eutectic hydrated salt phase change material in the embodiment is:

[0048] Step 1, mixing magnesium chloride hexahydrate and calcium chloride hexahydrate, heating to melting under the condition of 40~70 ℃, stirring evenly, to obtain calcium chloride hexahydrate / magnesium chloride hexahydrate eutectic hydrated salt solution;

[0049] Step 2, adding a nucleating agent and a thickening agent to the eutectic hydrated salt solution obtained in step 1 in turn under stirring conditions, and continuing to heat at a temperature of 40 to 70 ° C until complete dissolution, to obtain a preliminary modified eutectic hydration salt solution. salt solution;

[0050] Step 3: Add nano-modifier to the preliminary modified eutectic hydrated salt solution obtained in step 2, and ultrasonically disperse for 60-90 min under the condition of heating at 40-70 °C to obtain a further modified eutectic hydrated salt solution ;

[0051] Step 4: Add stabili...

Embodiment 1

[0053] Step 1: Mix 10 parts of magnesium chloride hexahydrate and 90 parts of calcium chloride hexahydrate powder, put it in a beaker, and put it into a water bath to heat and dissolve at 50 °C, and use a magnetic stirring rotor to stir the solution until it becomes clear solution to obtain calcium chloride hexahydrate / magnesium chloride hexahydrate eutectic hydrated salt solution;

[0054] Step 2: adding 1wt% of strontium chloride hexahydrate and 0.3wt% of calcium chloride hexahydrate / magnesium chloride hexahydrate eutectic hydrated salt solution to the eutectic hydrated salt solution prepared in step 1 in turn under stirring conditions; hydroxymethyl cellulose, continue to be heated at 50°C until completely dissolved to obtain a preliminary modified eutectic hydrated salt solution;

[0055] Step 3: Add nano-titanium dioxide with a mass of 0.1 wt% of the calcium chloride hexahydrate / magnesium chloride hexahydrate eutectic hydrated salt solution to the preliminary modified eut...

Embodiment 2

[0058] Step 1: Mix 10 parts of magnesium chloride hexahydrate and 90 parts of calcium chloride hexahydrate powder, put it in a beaker, and put it into a water bath to heat and dissolve at 50 °C, and use a magnetic stirring rotor to stir the solution until it becomes clear solution to obtain calcium chloride hexahydrate / magnesium chloride hexahydrate eutectic hydrated salt solution;

[0059] Step 2: adding 1wt% of strontium chloride hexahydrate and 0.3wt% of calcium chloride hexahydrate / magnesium chloride hexahydrate eutectic hydrated salt solution to the eutectic hydrated salt solution prepared in step 1 in turn under stirring conditions; hydroxymethyl cellulose, continue to be heated at 50°C until completely dissolved to obtain a preliminary modified eutectic hydrated salt solution;

[0060] Step 3: Add nano-titanium dioxide with a mass of 0.3 wt% of the calcium chloride hexahydrate / magnesium chloride hexahydrate eutectic hydrated salt solution to the preliminary modified eut...

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Abstract

The invention discloses a method for improving thermal performance of a eutectic hydrated salt phase change material and a modified product of the eutectic hydrated salt phase change material, and belongs to the technical field of material chemistry. According to the eutectic hydrated salt phase-change material and the preparation method thereof, multi-element modifiers including the nucleating agent, the nano modifier, the stabilizer and the thickener are added into the eutectic hydrated salt phase-change material, so that the thermal performance of the eutectic hydrated salt phase-change material is improved, and the problems that the existing eutectic hydrated salt is high in supercooling degree in the using process; relative to a single hydrated salt phase change material, the latent heat is reduced. The modified eutectic hydrated salt phase change material can be obtained by using the modification method, and the raw materials comprise the following components in parts by mass: 5-20 parts of magnesium chloride hexahydrate, 80-95 parts of calcium chloride hexahydrate, 0.5-1.2 parts of a nucleating agent, 0.1-0.3 part of a nano modifier, 0.1-0.3 part of a stabilizer and 0.1-0.3 part of a thickening agent. The modified eutectic hydrated salt phase change material has excellent thermal performance.

Description

technical field [0001] The invention belongs to the technical field of material chemistry, and in particular relates to a method for improving the thermal performance of a eutectic hydrated salt phase change material and a modified product thereof. Background technique [0002] According to a global survey on energy consumption, carbon dioxide emissions in the residential sector, the building sector accounts for approximately 40% of the world's total energy consumption and one-third of global greenhouse gas (GHG) emissions. Consumption and emissions occur at all stages of a building's life cycle, from construction to demolition. Specifically, running climate control systems such as ventilation, heating and cooling consumes nearly 60% of a building's energy consumption. Reducing energy consumption is therefore crucial to achieving sustainable growth in the construction industry. Unlike traditional regulation systems, passive regulation systems utilize the energy available i...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063Y02E60/14
Inventor 李辉郑伍魁王飞乔志刚赵悦瑶孙金凤
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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