Results of the preliminary vehicle modeling are shown in Table II where the total vehicle curb weight peak power, and the estimated fuel economy were calculated for each combination of glider weight, hydrogen source, and driving schedule. A large disparity in fuel economy can be seen between the direct H2 and reformer systems. It is caused first by reformer efficiency; roughly 20-25% of the energy of the fuel is lost in reformation. Second, the reformers add significantly (21-22%) to the final curb weight of the vehicle, further reducing the fuel economy by 14% on FUDS (10% on FHDS). Third, the POX system loses 10% of the H2 in the anode exhaust. Finally, poor reformate quality penalizes the SRM system by ~2% on FUDS (-1% on FHDS), and twice that for the POX system. Note that this last effect can be significantly exacerbated during more aggressive driving cycles that require higher average and peak power from the fuel cell.

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