The replacement of conventional power generating systems by fuel cell systems is promising higher efficiencies and lower emissions. The integration of fuel cell systems within truck applications is a specific challenge with regard to the volume and weight specific power density. Especially the layout design of fuel cells and their peripheral systems components is an issue which is strongly related to the specific application. In this context the Hamburg University of Applied Sciences (HAW) investigated different types of fuel cells and their system integration at layout conditions. The simulation models developed at HAW are based on MATLAB Simulink coupled with external databases to determine the thermodynamic properties of gases. Within this paper a variation of the major operation parameters and their influences on the system layout are presented. The results have shown that the efficiency of a reference SOFC-GT system may vary between 40 and 65 %. The efficiency of a PEMFC system was determined with 20 to 45 % at layout conditions. In both cases the average cell voltage, FC-fuel utilization, excess air, pressure ratio and POX excess air are varied to investigate the major impacts on system efficiency and system layout design aspects. A rough estimation of the specific system weight has shown that the SOFC-GT achieves a specific system weight of 4.3 kg kW-1, whereas the PEMFC achieves a weight of 5.5 kg kW-1 with a comparably heavy stack specifications of 4 kg m-2. Even if PEMFC stacks currently have higher weight related power densities than SOFC stacks, this study has shown that the SOFC-GT system is promising a higher potential in reduction of weight, due to its higher efficiency in combination with a gas turbine.


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    Titel :

    A parametrical study of diesel-fed fuel cell power units for mobile applications


    Weitere Titelangaben:

    Eine parametrische Untersuchung von Brennstoffzellenantrieben mit Dieselkraftstoff für mobile Anwendungen


    Beteiligte:
    Nehter, Pedro (Autor:in) / Winkler, Wolfgang (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    15 Seiten, 12 Bilder, 3 Tabellen, 7 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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