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Efficient hydrogen storage in up-scale metal hydride tanks as possible metal hydride compression agents equipped with aluminium extended surfaces

Gkanas, Evangelos I.; Grant, David M.; Khzouz, Martin; Stuart, Alastair D.; Manickam, Kandavel; Walker, Gavin S.

Authors

Evangelos I. Gkanas

DAVID GRANT david.grant@nottingham.ac.uk
Professor of Materials Science

Martin Khzouz

Kandavel Manickam

GAVIN WALKER gavin.walker@nottingham.ac.uk
The Sir Harry and Lady Djanogly Chair in Sustainable Energy



Abstract

In the current work, a three-dimensional computational study regarding coupled heat and mass transfer during both the hydrogenation and dehydrogenation process in upscale cylindrical metal hydride reactors is presented, analysed and optimized. Three different heat management scenarios were examined at the degree to which they provide improved system performance. The three scenarios were: 1) plain embedded cooling/heating tubes, 2) transverse finned tubes and 3) longitudinal finned tubes. A detailed optimization study was presented leading to the selection of the optimized geometries. In addition, two different types of hydrides, LaNi5 and an AB2-type intermetallic were studied as possible candidate materials for using as the first stage alloys in a two-stage metal hydride hydrogen compression system. As extracted from the above results, it is clear that the case of using a vessel equipped with 16 longitudinal finned tubes is the most efficient way to enhance the hydrogenation kinetics when using both LaNi5 and the AB2-alloy as the hydride agents. When using LaNi5 as the operating hydride the case of the vessel equipped with 60 embedded cooling tubes presents the same kinetic behaviour with the case of the vessel equipped with 12 longitudinal finned tubes, so in that way, by using extended surfaces to enhance the heat exchange can reduce the total number of tubes from 60 to 12. For the case of using the AB2-type material as the operating hydride the performance of the extended surfaces is more dominant and effective compared to the case of using the embedded tubes, especially for the case of the longitudinal extended surfaces.

Citation

Gkanas, E. I., Grant, D. M., Khzouz, M., Stuart, A. D., Manickam, K., & Walker, G. S. (2016). Efficient hydrogen storage in up-scale metal hydride tanks as possible metal hydride compression agents equipped with aluminium extended surfaces. International Journal of Hydrogen Energy, 41(25), 10795-10810. https://doi.org/10.1016/j.ijhydene.2016.04.035

Journal Article Type Article
Acceptance Date Apr 5, 2016
Online Publication Date May 4, 2016
Publication Date Jul 6, 2016
Deposit Date Jul 6, 2016
Publicly Available Date Jul 6, 2016
Journal International Journal of Hydrogen Energy
Print ISSN 0360-3199
Electronic ISSN 0360-3199
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 41
Issue 25
Pages 10795-10810
DOI https://doi.org/10.1016/j.ijhydene.2016.04.035
Keywords Metal hydride compression systems; Hydrogen storage; Heat management; AB2-type intermetallics; Extended surfaces
Public URL http://eprints.nottingham.ac.uk/id/eprint/34688
Publisher URL http://www.sciencedirect.com/science/article/pii/S036031991630489X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc-nd/4.0





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