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Analytical Performance of Direct-Hydrogen-Fueled Polymer Electrolyte Fuel Cell (PEFC) Systems for Transportation Applications
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1998-08-02
[PDF-674.18 KB]
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Abstract:The performance of a stand-alone polymer electrolyte fuel cell (PEFC) system directly fueled by hydrogen has been evaluated for transportation vehicles. The study was carried out using a systems analysis code and a vehicle analysis code. The systems code includes models for the various PEFC components and is applicable for steady-state and transient situations. At the design point the system efficiency is above 50% for a 50-kW system. The efficiency improves under partial load and approaches 60% at 40% load as the fuel cell operating point moves to lower current densities on the V-I polarization curve. At much lower loads, the system efficiency drops because of the deterioration in the performance of the compressor, expander, and eventually the fuel cell. The results of the transient analysis indicate that the PEFC system can start rapidly from ambient temperatures (300K). The PEFC system has been evaluated for near term and future mid-size vehicles. The results of the study show that the PEFC system can meet the demands of the Federal Urban Driving Schedule (FUDS) and the Highway driving cycles, for both warm and cold start-up conditions. The results also indicate that the future PEFC vehicle can meet the fuel economy goal of 80 miles per gallon (mpg) equivalent.
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Content Notes:Publication date is the first day of the 33rd Intersociety Engineering Conference on Energy Conversion. This date is an estimation due to no publication date being provided.
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