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http://dx.doi.org/10.7316/KHNES.2013.24.1.050

Study on Optimization of Operating Conditions for High Temperature PEM Fuel Cells Using Design of Experiments  

Kim, Jintae (Hydrogen and Fuel Cell Research Center, Korea Institute of Energy Research)
Kim, Minjin (Hydrogen and Fuel Cell Research Center, Korea Institute of Energy Research)
Sohn, Youngjun (Hydrogen and Fuel Cell Research Center, Korea Institute of Energy Research)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.24, no.1, 2013 , pp. 50-60 More about this Journal
Abstract
High temperature proton exchange membrane fuel cells (PEMFCs) using phosphoric acid (PA) doped polybenzimidazole (PBI) membranes have been concentrated as one of solutions to the limits with traditional low temperature PEMFCs. However, the amount of reported experimental data is not enough to catch the operational characteristics correlated with cell performance and durability. In this study, design of experiments (DOE) based operational optimization method for high temperature PEMFCs has been proposed. Response surface method (RSM) is very useful to effectively analyze target system's characteristics and to optimize operating conditions for a short time. Thus RSM using central composite design (CCD) as one of methodologies for design of experiments (DOE) was adopted. For this work, the statistic models which predict the performance and degradation rate with respect to the operating conditions have been developed. The developed performance and degradation models exhibit a good agreement with experimental data. Compared to the existing arbitrary operation, the expected cell lifetime and average cell performance during whole operation could be improved by optimizing operating conditions. Furthermore, the proposed optimization method could find different new optimal solutions for operating conditions if the target lifetime of the fuel cell system is changed. It is expected that the proposed method is very useful to find optimal operating conditions and enhance performance and durability for many other types of fuel cell systems.
Keywords
High Temperature PEM Fuel cell; DOE; RSM; Optimization;
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