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2014 年 10 月 28 日
Seminar - Study on optimal parameters estimation and cell performance of a proton exchange membrane Fuel by flow modification By Professor WU Horng Wen

Date: 28 October 2014 (Tuesday)

Time: 3:00 pm – 4:00 pm

Venue: EF305, The Hong Kong Polytechnic University

Abstract:

This talk will include two parts. In the first part the development of innovative
methods for characterizing the mechanical properties of nanowires, nanobelts and
ultrathin films will be introduced. In the second part the fundamental understanding of
deformation mechanisms of a thin film multilayered structure under mechanical loading
and its removal characteristics involved in abrasive machining will be discussed.

The major advantages of proton exchange membrane fuel cell (PEMFC) are low-temperature operation, high efficiency, no emission, low noise, and quick starting to high energy and current density under room temperature. Therefore, it is valued as the best choice in the next generation dynamic system or the portable power source in recent years. The flow field structural design decides the fluid state for reactant and product, so it is the key point for fuel cell parts. This research is to perform an experimental and numerical study on the adequate number of cuboid installed transversely and then to investigate how the flow characteristics and the heat and mass transfer affect the performance of PEM fuel cell. This research also builds the allocation of the experimental parameter more completely by the Taguchi method of parameter design, to investigate how the various factors influence the performance of single PEM fuel cell with the least runs of experiment. This research first uses the Taguchi method to determine the optimal combination of six primary operating parameters (flow orientation, temperature of fuel cell, anode and cathode humidification temperatures, anode, and cathode stoichiometric flow ratios) of a PEM fuel cell for smooth-walled channel. In addition, a three-dimensional model of a partial cross-section and entire cell is applied to analyze the cell performance of PEM fuel cells using cuboids with various numbers and arrangements transversely inserted at the axis in the channel. The numerical results show the higher performance with reasonable pressure drop. For the best number and arrangement of the cuboids in the channel, the Taguchi methodology for the multi-objective parametric optimization is then used in the experiment to determine the optimal combination of five primary operating parameters (temperature of fuel cell, anode and cathode humidification temperatures, anode, and cathode stoichiometric flow ratios) for maximum electrical power and minimum pressure drops. The main component analysis method is applied and the results are also compared with those of Taguchi method. As a result, the multi-objective optimization increases the electrical power by 30% and decreases the pressure drops by 275%. Multi-objective Tachigu method improves 51.28 % quality loss, and main component analysis method improve 20.68%. The results of this research may be of interest to engineers attempting to develop optimal fuel cell performance and to researchers interested in the transport phenomenon of the internal flow modification corresponding to the optimization condition in PEM fuel cells.

Bio-sketch:

Prof. Horng-Wen Wu is currently a Professor at the Department of System and Naval Mechatronic Engineering of National Cheng Kong University in Taiwan. He received BS in Mechanical Engineering from National Chung Hsing University in 1979, MS and PhD in Mechanical Engineering from National Cheng Kung University in 1981 and 1988, respectively and became a Professor of National Cheng Kung University in 1998. He was also a Visiting Professor at Michigan State University 2001~2002. Prof. Wu received excellent young engineer, Association of Naval Architects and Marine Engineers, R.O.C., 1991, awards of excellent work on research project from Executive Yuan, 1996, award grants and leader grants of general research project from National Science Council of R.O.C., 1980, 1997, 1998, and 2002~2014, and awards of excellent work for technology transfer and collaboration between industry and university from National Chung Hsing University in 2010. He is in the editorial board for Journal of Heat and Mass Transfer. His research interests include, internal combustion engines, fuel cell, electronic device cooling related to performance enhancement, air pollution control and heat transfer enhancement. He published over 66 research papers including 46 SCI and 9 EI international journal publications in International Journal of Heat and Mass Transfer, International Journal of Thermal Sciences, Energy, Journal of Heat Transfer-Transactions of the ASME, Energy Conversion and Management, International Journal of Hydrogen Energy, Journal of Power Sources, Applied Energy, Applied Thermal Engineering, International Journal of Numerical Methods for Heat & Fluid Flow, Numerical Heat Transfer, Experiments in Fluids, International Communications in Heat and Mass Transfer, Communications in Numerical methods in Engineering, Acta Mechanica, and Heat and Mass Transfer, and so on. He has obtained four patents related to underwater Power, purification of particle dust, and treatment of burned gas.