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Energies 2014, 7(9), 5502-5522; doi:10.3390/en7095502

Modeling and Analysis of Transport Processes and Efficiency of Combined SOFC and PEMFC Systems

Department of Mechanical Engineering, Thermal Energy System, Technical University of Denmark, Building 403, 2800 Kgs Lyngby, Denmark
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Received: 20 May 2014 / Revised: 12 August 2014 / Accepted: 19 August 2014 / Published: 25 August 2014
(This article belongs to the Special Issue Reacting Transport Phenomena in Solid Oxide Fuel Cells)
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Abstract

A hybrid fuel cell system (~10 kWe) for an average family house including heating is proposed. The investigated system comprises a Solid Oxide Fuel Cell (SOFC) on top of a Polymer Electrolyte Fuel Cell (PEFC). Hydrogen produced from the off-gases of the SOFC can be fed directly to the PEFC. Simulations for the proposed system were conducted using different fuels. Here, results for natural gas (NG), dimethyl ether (DME) and ethanol as a fuel are presented and analysed. Behaviour of the proposed system is further investigated by comparing the effects of key factors such as utilisation factor, operating conditions, oxygen-to-carbon (O/C) ratios and fuel preheating effects on these fuels. The combined system improves the overall electrical conversion efficiency compared with standalone PEFC or SOFC systems. For the combined SOFC and PEFC system, the overall power production was increased by 8%–16% and the system efficiency with one of the fuels is found to be 12% higher than that of the standalone SOFC system. View Full-Text
Keywords: Solid Oxide Fuel Cell (SOFC); Proton Exchange Membrane Fuel Cell (PEMFC); fuel cell; hybrid systems; system efficiency; multi-fuel Solid Oxide Fuel Cell (SOFC); Proton Exchange Membrane Fuel Cell (PEMFC); fuel cell; hybrid systems; system efficiency; multi-fuel
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Rabbani, A.; Rokni, M. Modeling and Analysis of Transport Processes and Efficiency of Combined SOFC and PEMFC Systems. Energies 2014, 7, 5502-5522.

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