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Performance analysis of a high-temperature magnesium hydride reactor tank with a helical coil heat exchanger for thermal storage

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Authors
Mathew, Arun
Nadim, Nima
Chandratilleke, Tilak
Humphries, Terry
Paskevicius, Mark
Buckley, Craig
Date
2020
Type
Journal Article

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Mathew, A. and Nadim, N. and Chandratilleke, T.T. and Humphries, T.D. and Paskevicius, M. and Buckley, C.E. 2020. Performance analysis of a high-temperature magnesium hydride reactor tank with a helical coil heat exchanger for thermal storage. International Journal of Hydrogen Energy. 46 (1): pp. 1038-1055.
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International Journal of Hydrogen Energy
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Faculty
Faculty of Science and Engineering
School
School of Civil and Mechanical Engineering
School of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
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Abstract

© 2020 Hydrogen Energy Publications LLC

Metal hydrides are regarded as one of the most attractive options for thermal energy storage (TES) materials for concentrated solar thermal applications. Improved thermal performance of such systems is vitally determined by the effectiveness of heat exchange between the metal hydride and the heat transfer fluid (HTF). This paper presents a numerical study supported by experimental validation on a magnesium hydride reactor fitted with a helical coil heat exchanger for enhanced thermal performance. The model incorporates hydrogen absorption kinetics of ball-milled magnesium hydride, with titanium boride and expanded natural graphite additives obtained by Sievert's apparatus measurements and considers thermal diffusion within the reactor to the heat transfer fluid for a realistic representation of its operation. A detailed parametric analysis is carried out, and the outcomes are discussed, examining the ramifications of hydrogen supply pressure and its flow rate. The study identifies that the enhancement of thermal conductivity in magnesium hydride has an insignificant impact on current reactor performance.