| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 95 === A one-dimensional, nonisothermal model of PEM fuel cell which describes mass, heat and electrochemical phenomena and takes into account the multiphase presence of water in the flow channels, was investigated. Sensitivity analysis was conducted with respect to eleven parameters whose value assignment seemed essential for best simulation results. The MATLAB subroutine sens_sys was used to obtain the absolute and relative sensitivities, and the parameters with significant influence on the model were identified. Model-based optimization was performed with the objective of maximizing the power density subject to constraints. Eight design variables, which have strong influence on the power density, were selected as the design/decision variables. The nature of the optimization problem was explored using the powerful graphical capability of MATLAB. Strong nonlinearity observed in the graphical solution encouraged the use of nonlinear programming as the optimization scheme to determine the best solution for selected process constraints. Optimization results, which were presented as function of average current density, showed high value of average power density and satisfaction of the imposed side and physical constraints suggesting that optimality and feasibility of the design have been achieved.
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