Recent progress in the use of magnesium chloride hexahydrate used as a phase change material#br#

doi:10.12028/j.issn.2095-4239.2016.0061

Abstract

Abstract: Magnesium chloride hexahydrate (bischofite) has a phase transition temperature at about 117 ℃ with a phase change enthalpy of 160 kJ/kg. Such a material is non-flammable and has a high thermal conductivity and low price, and is therefore regarded as a promising phase change material (PCM) for medium temperature thermal energy storage applications. This paper aims to provide a state-of-the-art review on thermophysical properties of the material, including phase transition temperature, phase change enthalpy, heat capacity, thermal conductivity and density. Potential problems are identified for using the material as a PCM, including the extent of supercooling, phase separation, corrosion, and hygroscopicity of hexahydrate magnesium chloride. Discussion is made on possible solutions to these problems. It is concluded that good cycle stability could be achieved if a suitable nucleating agent and a thickener are used. Potential applications of the material as a PCM or as part of PCM mixtures are discussed.

Key words: thermal energy storage, phase change material, magnesium chloride hexahydrate, supercooling, phase separation

WANG Huichun, LING Ziye, FANG Xiaoming, YUAN Kunjie, ZHANG Zhengguo. Recent progress in the use of magnesium chloride hexahydrate used as a phase change material#br#[J]. Energy Storage Science and Technology, 2017, 6(2): 204-212.

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