Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 38, Issue 23, Pages 9766-9771Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2013.05.026
Keywords
Hydrogen storage; Magnesium hydride; Heat of reaction; Phase change material; Latent heat; Energy efficiency
Categories
Funding
- Carnot Institute Energies du Futur
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The formation of magnesium hydride under hydrogen pressure is highly exothermic. The enthalpy of reaction represents 31% of the lower heating value (LHV) of the absorbed hydrogen. A new concept of MgH2 tank was developed to store the heat of reaction by using a phase-change material (PCM). The heat of desorption is mainly provided by the latent heat of solidification of the PCM. A metallic alloy based on Mg-Zn eutectic was selected as PCM in order to enhance the thermal exchange with the MgH2 compacts. A pilot tank of about 7000 NL of hydrogen was designed and tested under various experimental conditions. Desorption was achieved in 3 h and the daily storage efficiency was around 70%. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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