Performance of high-temperature polymer electrolyte fuel cell systems

Performance of gasoline reformed, polymer electrolyte fuel cell (PEFC) systems for transportation with a high-temperature solid membrane capable of operating at 150–200 °C is discussed. Particular emphasis is placed on system layout, ease of fuel reforming, overall system efficiency, specific weight of the power system, heat rejection and water recovery. These are assessed in terms of the primary system variables, i.e. the operating pressure, reforming temperature, water-to-fuel ratio in the fuel processor, and the stack temperature. It is found that the system efficiency and water recovery are intimately affected by whether the condenser is located to operate at the system operating pressure or at close to ambient pressure.