Enhancement of hydrogen charging in metal hydride-based storage systems using heat pipe

Heat transfer in metal hydride bed significantly affects the performance of metal hydride reactors (MHRs). Enhancing heat transfer within the reaction bed improves the hydriding rate. This study presents performance analysis in terms of storage capacity and time of three different cylindrical MHR co...

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Bibliographic Details
Published in:	International journal of hydrogen energy Vol. 44; no. 34; pp. 18927 - 18938
Main Authors:	Elhamshri, Fawzi A.M., Kayfeci, Muhammet
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 12-07-2019
Subjects:	Charging pressure Finned heat pipe Heat pipe Heat transfer Hydrogen storage Hydrogen storage Charging pressure Heat pipe Heat transfer Finned heat pipe
Online Access:	Get full text
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Summary:	Heat transfer in metal hydride bed significantly affects the performance of metal hydride reactors (MHRs). Enhancing heat transfer within the reaction bed improves the hydriding rate. This study presents performance analysis in terms of storage capacity and time of three different cylindrical MHR configurations using storage media LaNi5: a) reactor cooled with natural convection, b) reactor with a heat pipe on the central axis, c) reactor with finned heat pipe. This study shows the impact of using heat pipes and fins for enhancing heat transfer in MHRs at varying hydrogen supply pressures (2–15 bar). At any absorption temperature, hydrogen absorption rate and hydrogen storage capacity increase with the supply pressure. Results show that using a heat pipe improves hydrogen absorption rate. It was found that finned heat pipe has a significant effect on the hydrogen charge time, which reduced by approximately 75% at 10 bar hydrogen supply pressure. •A metal hydrogen storage reactor equipped with finned heat pipes.•Effects of finned heat pipes were shown experimentally using LaNi5 as the storage media.•Usage of finned heat pipe is feasible for improving the hydrogen absorption rate.•The absorption time was reduced by 75% compared to that without heat pipe reactor.
ISSN:	0360-3199 1879-3487
DOI:	10.1016/j.ijhydene.2018.10.040