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Appl. Sci. 2019, 9(5), 814; https://doi.org/10.3390/app9050814

A Form Stable Composite Phase Change Material for Thermal Energy Storage Applications over 700 °C

1
BCES Birmingham Centre of Energy Storage, University of Birmingham, Birmingham B15 2TT, UK
2
University of Science and Technology Beijing, Beijing 100083, China
3
Henan Energy Storage Technology co., Ltd., Hebi 458030, China
4
Global Energy Interconnection Research Institute co., Ltd., Beijing 102209, China
*
Author to whom correspondence should be addressed.
Received: 31 December 2018 / Revised: 19 February 2019 / Accepted: 20 February 2019 / Published: 26 February 2019
(This article belongs to the Special Issue Materials for Thermal Energy Storage)
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Abstract

Thermal energy storage (TES) is a highly effective approach for mitigating the intermittency and fluctuation of renewable energy sources and reducing industrial waste heat. We report here recent research on the use of composite phase change materials (PCM) for applications over 700 °C. For such a category of material, chemical incompatibility and low thermal conductivity are often among the main challenges. Our aims are to address these challenges through the formulation of form-stable composite PCMs and to understand their thermophysical properties. The eutectic K2CO3-Na2CO3 salt was used as a PCM with MgO as a form stabilizer. We found that such a formulation could maintain shape stability with up to 60 wt.% PCM. With a melting point of ~710.1 °C and an energy density as high as 431.2 J/g over a temperature range between 550 °C and 750 °C, the composite PCM was shown to be thermally stable up to 885 °C. An addition of 10 wt.% SiC enhanced the overall thermal conductivity from 1.94 W·m−1 K−1 to 2.28 W·m−1 K−1, giving an enhancement of 17.53%. Analyses of thermal cycling data also showed a high extent of chemical compatibility among the ingredients of the composite PCM. View Full-Text
Keywords: phase change material; high-temperature thermal storage; form stable composite phase change material (PCM); eutectic carbonate; silicon carbide phase change material; high-temperature thermal storage; form stable composite phase change material (PCM); eutectic carbonate; silicon carbide
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Jiang, Z.; Jiang, F.; Li, C.; Leng, G.; Zhao, X.; Li, Y.; Zhang, T.; Xu, G.; Jin, Y.; Yang, C.; Ding, Y. A Form Stable Composite Phase Change Material for Thermal Energy Storage Applications over 700 °C. Appl. Sci. 2019, 9, 814.

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