Screening of metal hydride pairs for closed thermal energy storage systems

Aswin, N and Dutta, Pradip and Murthy, Srinivasa S (2016) Screening of metal hydride pairs for closed thermal energy storage systems. In: APPLIED THERMAL ENGINEERING, 109 (B). pp. 949-957.

PDF App_The_Eng_109_949_B_2016.pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy

Abstract

Thermal energy storage systems based on metal/hydrides usually are closed systems composed of two beds of metal/alloy - one meant for energy storage and the other for hydrogen storage. It can be shown that a feasible operating cycle for such a system using a pair of metals/alloys operating between specified temperature values can be ensured if the equilibrium hydrogen intake characteristics satisfy certain criteria. In addition, application of first law of thermodynamics to an idealized operating cycle can provide the upper bounds of selected performance indices, namely volumetric energy storage density, energy storage efficiency and peak discharge temperature. This is demonstrated for a representative system composed of LaNi4.7Al0.3-LaNi5 operating between 353 K and 303 K which gave values of about 56 kW h m(-3) for volumetric storage density, about 85% for energy storage efficiency and 343 K for peak discharge temperature. A system level heat and mass transfer study considering the reaction kinetics, hydrogen flow between the beds and heat exchanger models is presented which gave second level estimates of about 40 kW h m(-3) for volumetric energy storage density, 73% for energy storage efficiency and 334 K for peak temperature for the representative system. The results from such studies lead to identifying metal/alloy pairs which can be shortlisted for detailed studies. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Publication:	APPLIED THERMAL ENGINEERING
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Additional Information:	Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	07 Jan 2017 09:53
Last Modified:	06 Oct 2018 14:40
URI:	http://eprints.iisc.ac.in/id/eprint/55879

Actions (login required)

View Item