Thermal and Electrical Coupling in Stacks
Many of the other chapters of this book are devoted to understanding several key aspects of PEMFCs at a fundamental but local level. These include membrane transport, the influence of catalyst layer structure on performance and the nature of two-phase flow (liquid, water, and gas) in electrodes. However, if one has accurate parametric descriptions of these phenomena, from detailed models fitted to experimental measurements, the question remains how these locally fitted models will combine with more well-understood phenomena of gas, heat, and electrical transport to determine overall systemperformance, at the unit cell or stack level. This is the question addressed in this chapter, in which a stack level computational model of a PEMFC stack is presented and discretized, and an iterative strategy is described. This computational model is capable of simulating thermal and electrical interactions of unit cells in large stacks. It is computationally efficient, requiring only a...
KeywordsCatalyst Layer Membrane Electrode Assembly Coolant Channel Bipolar Plate Cathode Catalyst
The work described here is a summary of ideas developed by a group of academic mathematicians working with scientists from Ballard, including Peter Berg, Radu Bradean, Atife Caglar, Paul Chang, Gwang-Soo Kim, Keith Promislow, Jean St-Pierre, John Stockie, and Juergen Stumper. The group is funded by both Ballard and the Mathematics of Information Technology and Complex Systems (MITACS) Network Centre of Excellence in Canada.
- T.N. Nguyen and R.E. White, J. Electrochem. Soc 140, 2178 (1993).Google Scholar
- S. Freunberger, A. Tsukada, G. Fafilek and F.N. Buechi, “1 + 1 dimensional model of a PE fuel cell of technical size,” Paul Scherrer Institut Scientific Report 2002 Volume V, article #94.Google Scholar
- K. Promislow and B. Wetton, “A Simple, Mathematical Model of Thermal Coupling in Fuel Cell Stacks,” accepted in the J. Power Sources, 150, 129–135. February, (2005).Google Scholar
- S. Motupally, A.J. Becker, and J.W. Weidner, “Diffusion of Water in Nafion 115 Membranes,” J. Electrochem. Soc., 147, 3171 (2000).Google Scholar
- T. Zawodziski, C. Derouin, S. Radzinski, R. Sherman, V. Smith, T. Springer and S. Gottesfeldt, “Water-Uptake by and Transport Through Nafion 117 Membranes,” J. Electrochem. Soc., 140, 1981 (1993).Google Scholar
- P. Berg, A. Caglar, J. St-Pierre, K. Promislow and B. Wetton, “Electrical Coupling in Proton Exchange Membrane Fuel Cell Stacks: Mathematical and Computational Modelling,” accepted in the IMA J. Appl. Math., March, (2005).Google Scholar
- G. S. Kim, J. St-Pierre, K. Promislow and B. Wetton, “Electrical Coupling in PEMFC Stacks”, accepted in the J. Power Sources, 152, 210–217. January, (2005).Google Scholar
- B. Wetton, K. Promislow and A. Caglar, “A Simple Thermal Model of PEM Fuel Cell Stacks,” in the proceedings of the Second International Conference on Fuel Cell Science, Engineering and Technology, Rochester, June, 2004.Google Scholar
- K. Promislow, J. Stockie, B. Wetton, “A sharp interface reduction for multiphase transport in a porous fuel cell electrode,” 462, 789–816, 2006.Google Scholar