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Macro Level Modeling of a Tubular Solid Oxide Fuel Cell

Department of Mechanical Engineering, Dalhousie University, 1360 Barrington Street, Room C360, Halifax, Nova Scotia, B3J 1Z1, Canada
Department of Mechanical and Industrial Engineering, Ryerson University, 350 Victoria Street Toronto, Ontario, M5B 2K3, Canada
Department of Mechanical Engineering, Faculty of Engineering, Hacettepe University, Beytepe, Ankara 06800, Turkey
Author to whom correspondence should be addressed.
Sustainability 2010, 2(11), 3549-3560;
Received: 14 October 2010 / Revised: 5 November 2010 / Accepted: 8 November 2010 / Published: 18 November 2010
This paper presents a macro-level model of a solid oxide fuel cell (SOFC) stack implemented in Aspen Plus® for the simulation of SOFC system. The model is 0-dimensional and accepts hydrocarbon fuels such as reformed natural gas, with user inputs of current density, fuel and air composition, flow rates, temperature, pressure, and fuel utilization factor. The model outputs the composition of the exhaust, work produced, heat available for the fuel reformer, and electrochemical properties of SOFC for model validation. It was developed considering the activation, concentration, and ohmic losses to be the main over-potentials within the SOFC, and mathematical expressions for these were chosen based on available studies in the literature. The model also considered the water shift reaction of CO and the methane reforming reaction. The model results were validated using experimental data from Siemens Westinghouse. The results showed that the model could capture the operating pressure and temperature dependency of the SOFC performance successfully in an operating range of 1–15 atm for pressure and 900 °C–1,000 °C for temperature. Furthermore, a sensitivity analysis was performed to identify the model constants and input parameters that impacted the over-potentials. View Full-Text
Keywords: solid oxide fuel cell (SOFC); gas turbine (GT); hybrid cycle; modeling; fuel cell losses solid oxide fuel cell (SOFC); gas turbine (GT); hybrid cycle; modeling; fuel cell losses
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Suther, T.; Fung, A.; Koksal, M.; Zabihian, F. Macro Level Modeling of a Tubular Solid Oxide Fuel Cell. Sustainability 2010, 2, 3549-3560.

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