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Siegel C.,Gmbnter for Fuel Cell Technology | Siegel C.,University of Duisburg - Essen | Siegel C.,Siegel Schleimer Ingenieurs Conseils S Rl Engineering And Research | Bandlamudi G.,Gmbnter for Fuel Cell Technology | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2011

Segmented temperature measurements were performed to better understand the thermal behaviour and thermal interactions between the fluid-(gas)-phase and solid-phase temperature within a working high temperature polymer electrolyte membrane (HTPEM) fuel cell. Three types of flow-fields were studied, and the influence of temperature for no-load and load operating conditions was investigated. Tests were performed under various operating conditions, and the results demonstrate the utility of segmented temperature measurements. A significant difference in the temperature distribution was observed when the HTPEM fuel cell was operated with pure hydrogen and with hydrogen containing carbon monoxide. The findings may lead to improved HTPEM fuel cells and future middle temperature polymer electrolyte membrane (MTPEM) fuel cell designs. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. Source


Siegel C.,Gmbnter for Fuel Cell Technology | Siegel C.,University of Duisburg - Essen | Siegel C.,Siegel Schleimer Ingenieurs conseils S.ar.l. Engineering and Research | Bandlamudi G.,Gmbnter for Fuel Cell Technology | And 4 more authors.
Fuel Cells | Year: 2011

Significant advances have been reported in building and testing of high-temperature polymer electrolyte membrane (HTPEM) fuel cells and stacks during recent years. Quantity distribution measurement techniques (e.g. current density, temperature and electrochemical impedance spectroscopy (EIS)) using segmented cells are commonly used to characterise low-temperature PEM (LTPEM) fuel cells. Performing these measurements at higher temperatures is more difficult and a relatively new process. For this study, a fully operational segmented HTPEM fuel cell using a straight flow-field configuration was designed, constructed and tested. The cathode side bipolar half-plate consisted of 36 exchangeable segments, whereas, the anode side bipolar half-plate was not segmented. The cell was operated at various operating temperatures with various anode gas compositions and air (no backpressure). In addition to the experimental results, a simple computational fluid dynamics model based on COMSOL Multiphysics® 3.5a was used to support the observed behaviour during segmented measurements. The computational domain consisted of the cathode side gas channels and the porous media. All of the boundary conditions and gas properties were defined in a manner similar to the experimental investigations. Some of the theoretical results were compared to the experimental results and conclusions were drawn. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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