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Temperature regulation in an evaporatively cooled proton exchange membrane fuel cell stack

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posted on 10.07.2015 by Ashley Fly, Rob Thring
Maintaining proton exchange membrane fuel cell (PEMFC) stack operating temperature across transient current profiles presents a significant challenge for fuel cell vehicles. Liquid cooled systems require active control of coolant temperature and flow rate to match heat rejection to heat generation. Evaporative cooling is an alternative to conventional liquid cooling in automotive sized PEMFC stacks. In an evaporatively cooled system, liquid water is injected directly into the cathode flow channels where it evaporates, both cooling and humidifying the stack. This paper uses a validated simulation to explore the inherent temperature regulation abilities of an evaporatively cooled PEMFC stack across a range of current profiles and drive cycles. Results show that throughout the normal operating current range, stack temperature varies by less than±2.0°C, this is comparable to liquid cooling but without the need for active temperature control. The introduction of variable operating pressure and cathode stoichiometry using proportional integral control, can further reduce temperature variation to±1.0°C and±1.2°C respectively for step increases in current demand. Variable operating pressure is also shown to improve warm up time and reduce heat loss at low operating loads.

Funding

The authors would like to acknowledge the support of the EPSRC and the Doctoral training centre in hydrogen fuel cells and their applications, grant number EP/G037116/1.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

International Journal of Hydrogen Energy

Citation

FLY, A. and THRING, R.H., 2015. Temperature regulation in an evaporatively cooled proton exchange membrane fuel cell stack. International Journal of Hydrogen Energy, 40(35), pp.11976-11982.

Publisher

© The Authors. Published by Elsevier Ltd on behalf of Hydrogen Energy Publications, LLC.

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Publication date

2015

Notes

This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).

ISSN

0360-3199

Other identifier

S0360-3199(15)00998-2

Language

en

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