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Numerical investigation of heat and mass transfer during hydrogen sorption in a mixture of AB2 – AB5 metal hydride for hydrogen storage

Mapula Lucey Moropeng ORCID logo, Andrei Kolesnikov, Mykhaylo Lototskyy and Avhafunani Mavhungu

Abstract

This paper presents the investigation of a two dimensional coupled model of heat and mass transfer in a mixture of AB2 – AB5 metal hydride (MH) systems of a cylindrical configuration during hydrogen sorption using COMSOL 5.3a commercial software. The parametric study on the sorption process has been studied with variation of heat transfer coefficient (HTC), and activation energy (AE) to understand the effects they have on the reaction kinetics of the sorption process. The simulation results demonstrate the importance of mutual dependence between the temperature propagation in the body of metal hydride, the absorbed concentration of the hydrogen gas, and the gas pressure for the absorption of hydrogen gas in metal hydrides. The decrease in the activation energy is found to have significant effect on the dynamic performances of hydrogen absorption in the MH reactors with an increased amount of hydrogen conversion, whilst the variation of heat transfer coefficient displayed insignificant change in hydrogen conversion. The simulated results show good agreement with the experimental results obtained from HYSA Systems and were implemented for use in the STILL RX60-30L electric forklift fuel cell applications designed by HYSA Systems in the University of the Western Cape.


Corresponding author: Mapula Lucey Moropeng, Department of Chemical, Metallurgy and Materials Engineering, Tshwane University of Technology, Private Bag X 680, Pretoria, 0001, South Africa, E-mail:

Funding source: National Research Foundation

Funding source: Tshwane University of Technology

Funding source: University of the Western Cape

Acknowledgement

This work received a financial support from the National Research Foundation (NRF), Thuthuka Grant, and Grant number: TTK150611119278. The authors gratefully acknowledge the Department of Chemical, Metallurgical and Materials Engineering of the Tshwane University of Technology for hosting this project, and the HYSA Systems from the University of the Western Cape (DST-funded project KP3-S02) for their contribution.

  1. Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2019-09-04
Accepted: 2020-04-11
Published Online: 2020-07-28

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