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Maximum thermodynamic electrical efficiency of fuel cell system and results for hydrogen, methane and propane fuels
林子敬
Author NameAffiliationE-mail
林子敬 PhysicsDepartment University of Science and Technology of China zjlin@ustc.edu.cn 
Abstract:
The maximum electrical efficiency of fuel cell system, , is important for the understanding and development of the fuel cell technology. Attempt is made to build a theory for by considering the energy requirement of heating the fuel and air streams to the fuel cell operating temperature, T. A general thermodynamic analysis is performed and the energy balances for the overall operating processes of a fuel cell system are established. Explicit expressions for the determination of are deduced. Unlike the Carnot efficiency, is found to be fuel specific. Except for hydrogen fuel, chemical equilibrium calculations are necessary to compute . Analytical solutions for the chemical equilibriums of alkane fuels are presented. The theoretical model is used to analyze the effects of T and the steam content of CH4, C3H8 and H2 fuels on for systems with various degrees of waste heat recovery. Contrary to the common perception concerning methane and propane fuels, decreases substantially with the increase of T. Moreover, of hydrogen fuel can be higher than that of methane and propane fuels for a system with a medium level of waste heat recovery and operated at 700℃≤T≤900℃.
Key words:  Analytical theory  Energy balance  Nernst potential  Fuel utilization  Alkane  Chemical equilibrium
FundProject:
Maximum thermodynamic electrical efficiency of fuel cell system and results for hydrogen, methane and propane fuels
林子敬
摘要:
The maximum electrical efficiency of fuel cell system, , is important for the understanding and development of the fuel cell technology. Attempt is made to build a theory for by considering the energy requirement of heating the fuel and air streams to the fuel cell operating temperature, T. A general thermodynamic analysis is performed and the energy balances for the overall operating processes of a fuel cell system are established. Explicit expressions for the determination of are deduced. Unlike the Carnot efficiency, is found to be fuel specific. Except for hydrogen fuel, chemical equilibrium calculations are necessary to compute . Analytical solutions for the chemical equilibriums of alkane fuels are presented. The theoretical model is used to analyze the effects of T and the steam content of CH4, C3H8 and H2 fuels on for systems with various degrees of waste heat recovery. Contrary to the common perception concerning methane and propane fuels, decreases substantially with the increase of T. Moreover, of hydrogen fuel can be higher than that of methane and propane fuels for a system with a medium level of waste heat recovery and operated at 700℃≤T≤900℃.
关键词:  Analytical theory  Energy balance  Nernst potential  Fuel utilization  Alkane  Chemical equilibrium
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