The results of simulation on the system response to step changes to fuel cell load are shown in Fig. 2, in terms of fuel cell output, methanol flow rate, reformer fuel utilization, PEFC anode pressure and reformer outlet temperature. The case of propeller racing is represented in Fig. 3, in similar terms.

The simulation results shown in Figs. 2 and 3 indicate that, when the load is lowering, the fuel cell output can well follow the change in demand of load. The rise in reformer outlet temperature seen in Fig. 2 upon lowering of load could be eliminated by providing a bypass line from reformer combustion gas line to combustor. Such and other process improvements are currently being brought to the simulation system. The simulator is also being evaluated through comparisons with experimental data. The results can be expected to permit making more detailed analyses of PEFC propulsion plant performance.

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