Abstract
This report presents a performance analysis of a proton exchange membrane fuel cell (PEMFC) system, using GCtool software, from a system-level perspective. By systematic formulation, most of the operating parameters are derived through fuel cell equations and from empirical data. The most critical parameters are the working pressure and temperature of the fuel cell as well as the pressure gap across the cell membrane. When given a 100kW PEMFC stack with 45% efficiency and 80% fuel utility, the working pressure and its difference are selected at 4 atm and 0.1 atm via the system-level performance analyses. The selection of the working temperature of the PEMFC should take both thermal stability and humidity management into consideration. A PEMFC system with certain auxiliaries can achieve an estimated efficiency of more than 49%. It was found that the efficiency of the PEMFC system can be promoted with an increase in the working temperature.
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