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    A thermal energy storage prototype using sodium magnesium hydride

    82176.pdf (797.4Kb)
    Access Status
    Open access
    Authors
    Poupin, L.
    Humphries, Terry
    Paskevicius, Mark
    Buckley, Craig
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Poupin, L. and Humphries, T.D. and Paskevicius, M. and Buckley, C.E. 2019. A thermal energy storage prototype using sodium magnesium hydride. Sustainable Energy and Fuels. 3 (4): pp. 985-995.
    Source Title
    Sustainable Energy and Fuels
    DOI
    10.1039/C8SE00596F
    ISSN
    2398-4902
    Faculty
    Faculty of Science and Engineering
    School
    School of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/LP120101848
    http://purl.org/au-research/grants/arc/LP150100730
    http://purl.org/au-research/grants/arc/LE0989180
    http://purl.org/au-research/grants/arc/LE0775551
    http://purl.org/au-research/grants/arc/FT160100303
    URI
    http://hdl.handle.net/20.500.11937/82098
    Collection
    • Curtin Research Publications
    Abstract

    © The Royal Society of Chemistry.

    Metal hydrides present favourable thermal storage properties particularly due to their high energy density during thermochemical hydrogenation. For this purpose, sodium magnesium hydride (NaMgH3) has shown promising qualities that could lead to an industrialised application, but first requires to be examined on a lab-scale under realistic operating conditions. Herein, the cycling reversibility of NaMgH3 is undertaken on a 150 g scale with active heat extraction and delivery using superheated water vapour as the heat transfer fluid. The thermal and cycling properties of the hydride material are enhanced by addition of TiB2 and exfoliated natural graphite. Over 40 cycles the NaMgH3 showed minimal loss in capacity, but revealed difficulties in terms of thermal management to avoid local overheating, resulting in the production of undesired molten sodium metal. The temperature cycling showed a hydrogen flow culminating at 1 g h−1, which was insufficient to ensure thermal energy retrieval. The increase of the inlet hydrogen pressure has been shown to be instrumental in achieving an acceptable flow rate of 10 g h−1. Indeed, this design, despite high heat losses to the environment, was able to supply a third of the chemical energy available to the heat transfer fluid.

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