Design and Temperature Analysis of a Metal Hydride Cartridge Using Exhaust Heat of a Fuel Cell for Electric-assisted Bicycles

Junnosuke Shimogawa, Daisuke Hara, Shan Miao, Noboru Katayama, Kiyoshi Dowaki

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrogen is a candidate of alternative fuels and evaluated for fuel cell (FC) applications. As a hydrogen storage system, metal hydride (MH) is attracting attention due to its high energy volume density and safety. To apply fuel cells and metal hydride to electrically power assisted bicycles, a previous study has evaluated load weight and power demand through experiments conducted on existing electrically power assisted bicycles. Focusing on such energy supply system, this study designs metal hydride cartridge and investigate temperature changing when exhaust heat from fuel cell is supplied to metal hydride, which release hydrogen with absorbing heat. First, the negative effect of the exhaust heat supply to the fuel cell on the fuel cell performance is investigated and we proposed the usage of method to mitigate the effect. Next, the structure of MH cartridge is designed from weight and volume of the MH cartridge and exhaust flow rate of the FC, and we proposed a structure in which multiple small cylinders are stacked. Finally, FC exhaust heat was supplied to the designed dummy cartridge, and the amount of heat supply according to the FC output and power generation time was evaluated.

Original languageEnglish
Pages (from-to)152-161
Number of pages10
JournalNihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy
Volume101
Issue number8
DOIs
Publication statusPublished - Aug 2022

Keywords

  • Electric Bicycles
  • Fuel Cell
  • Heat transfer
  • Metal Hydride

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