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Numerical study on a two-stage metal hydride hydrogen compression system

Gkanas, Evangelos I.; Grant, David M.; Stuart, Alastair D.; Eastwick, Carol; Book, D.; Nayebossadri, S.; Pickering, L.; Walker, Gavin S.

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Evangelos I. Gkanas

David M. Grant

Alastair D. Stuart

Professor of Mechanical Engineering

D. Book

S. Nayebossadri

L. Pickering

Gavin S. Walker


A multistage Metal Hydride Hydrogen Compression (MHHC) system uses a combination of hydride materials in order to increase the total compression ratio, whilst maximizing the hydrogenation rate from the supply pressure at each stage. By solving the coupled heat, mass and momentum conservation equations simultaneously the performance of a MHHC system can be predicted. In the current work a numerical model is proposed to describe the operation of a complete compression cycle. Four different MHHC systems are examined in terms of maximum compression ratio, cycle time and energy consumption and it was found that the maximum compression ratio achieved was 22:1 when operating LaNi5 (AB5-type) and a Zr–V–Mn–Nb (AB2-type intermetallic) as the first and second stage alloys respectively in the temperature range of 20°C (hydrogenation) to 130°C (dehydrogenation).


Gkanas, E. I., Grant, D. M., Stuart, A. D., Eastwick, C., Book, D., Nayebossadri, S., …Walker, G. S. (in press). Numerical study on a two-stage metal hydride hydrogen compression system. Journal of Alloys and Compounds, 645(Supp1), Article S18-S22.

Journal Article Type Article
Acceptance Date Apr 8, 2015
Online Publication Date Apr 8, 2015
Deposit Date Oct 25, 2017
Publicly Available Date Oct 25, 2017
Journal Journal of Alloys and Compounds
Print ISSN 0925-8388
Electronic ISSN 1873-4669
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 645
Issue Supp1
Article Number S18-S22
Keywords Metal Hydride Hydrogen Compression; Metal hydride; Simulation; Coupled heat and mass transfer. Hydrogenation/dehydrogenation
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