Effects of cell-to-cell fuel mal-distribution on fuel cell performance and a means to reduce mal-distribution using MEMS micro-valves
| Autor: | Jimmy D. Thornton, Brian A. Bucci, Jeffrey S. Vipperman, Randall S. Gemmen, William W. Clark, J. Peter Hensel |
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| Rok vydání: | 2007 |
| Předmět: |
Engineering
Renewable Energy Sustainability and the Environment Energy management business.industry Nuclear engineering Electrical engineering Energy Engineering and Power Technology Proton exchange membrane fuel cell Piezoelectricity Volumetric flow rate Flow control (fluid) Direct energy conversion Stack (abstract data type) Potential flow Electrical and Electronic Engineering Physical and Theoretical Chemistry business |
| Zdroj: | Journal of Power Sources. 164:115-125 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2006.09.049 |
| Popis: | Achieving uniform flow among the cells of a fuel cell stack plays a significant role in being able to operate at maximum capability and efficiency. This paper presents experimental data showing the importance of cell-to-cell fuel flow balancing on fuel cell performance, and a fuel cell energy management (FCEM) technique that has demonstrated the ability to improve stack performance. In a specially instrumented four-cell polymer electrolyte fuel cell that allows external control of the air, fuel, and water-cooling flows to each cell, fuel to a single cell was reduced. V–I curves collected under these unbalanced conditions are compared to curves collected when the fuel flow to each cell was balanced. Reducing the fuel flow to a single cell by 11% decreased the V–I curve cutoff load by 10%—demonstrating the degree of negative effect that unbalanced fuel flows can have on stack performance. Typical fuel cell stacks have no dynamic means to keep flows in the stack balanced between the cells, but through the use of custom-built, piezoelectric micro-valves, a simple flow control strategy, and this custom four-cell laboratory stack, the positive effects of FCEM flow balancing at three different fuel flow rates was demonstrated. |
| Databáze: | OpenAIRE |
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