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

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...

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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

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