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Enhanced Specific Heat Capacity of Binary Chloride Salt by Dissolving Magnesium for High-temperature Thermal Energy Storage and Transfer

Abstract

Thermal energy storage and transfer technology has received great attention for concentrating solar power (CSP) and industrial waste heat recovery systems. In this study, we report a novel method to synthesize nanofluid by dissolving metal magnesium in NaCl-CaCl2 eutectic molten salt to enhance specific heat capacity without conventional agglomerate effect of nanoparticles. It was found that the solubility of magnesium in binary molten salt reached 0.075% and 0.185% at 550 ℃and 750 ℃, respectively. Magnesium did not react with molten salt, dissolved in molten salt in form of liquid metal magnesium and did not change the melting temperature of binary molten salt. The liquid specific heat capacity of nanofluid containing 1.0 wt.% and 2.0 wt.% magnesium was 1.12 J/g‧℃ and 1.15 J/g‧℃, which was 105.66% and 108.49% higher than that of binary chloride salt. Magnesium decreased the upper temperature limit and thermal stability, the nanofluid was thermally and chemically stable after 50 times heating/cooling cycles. These implied that the resulting nanofluid were promising candidate material for high-temperature heat storage and transfer applications.

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Publication details

The article was received on 14 May 2017, accepted on 19 Jun 2017 and first published on 19 Jun 2017


Article type: Paper
DOI: 10.1039/C7TA04169A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Enhanced Specific Heat Capacity of Binary Chloride Salt by Dissolving Magnesium for High-temperature Thermal Energy Storage and Transfer

    H. Tian, L. Du, C. Huang, X. Wei, J. Lu, W. wang and J. Ding, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04169A

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