Browsing by Author "Chen, Tang-Yuan"

Now showing 1 - 3 of 3

An Experimental Study on Micro Proton Exchange Membrane Fuel Cell
(2012-06-01)
Chen, Chiun-Hsun
;
Chen, Tang-Yuan
;
Cheng, Chih-Wei
;
Peng, Rong-Guie
;
機械工程學系
This study fabricates a micro proton exchange membrane fuel cell (PEMFC) using micro electro mechanical systems (MEMS) technology. The active area of the membrane is 2 cm x 2 cm (4 cm(2)). The study is divided into two categories: [(1) the parametric experimental investigation, and (2) the durability test. This work is an attempt to find out how several parameters, including reheat temperature, the material of the current collector plates, the open ratio, and different cathode gases affect micro PEFMC performance. According to the experimental results obtained, both the conducting area and the material of the current collector plates exert great influences on the performance of the micro PEMFC, especially in the conducting area. The cell's performance is finite when the gas reheat temperature is increased. The results show that the cell performance is better for an open ratio of 75% as compared to ratios of 50% and 67%. The concentration polarization is improved by increasing the air flow rate at high current densities, and if the GDL diffusive capability in the latter cell could be promoted, the differences between these two cells' performances would be reduced. Furthermore, the performance at an operating voltage of 0.6 V was the most stable one among the four cases tested, and the performance deviation at a fixed operating voltage of 0.4 V was less than +/- 2.2%. [DOI:10.1115/1.4005612]
Performance Analysis on Planar Micro PDMS Proton Exchange Membrane Fuel Cell Stack
(2011-06-01)
Peng, Rong-Gui
;
Chen, Tang-Yuan
;
Hsu, Yi-Ja
;
Chen, Chiun-Hsun
;
機械工程學系
The objective of this study is to develop a micro proton exchange membrane fuel cell (PEMFC) stack, in which a flow field plate in each cell is made of polydimethyl-siloxane (PDMS) and manufactured by micro-molding technology. A four-cell micro PEMFC stack in series with a volume of 12 cm x 4.5 cm x 1.2 cm is constructed and tested. The active area of a membrane electrode assembly (MEA) is 2 cm x 2 cm in each individual PEMFC, and the platinum loadings at anode and cathode are 0.3 and 0.5 mg/cm(2), respectively. A series of performance experiments were carried out. Experimental parameters included clamping force and fuel supply condition. Durability tests were carried out as well. Experimental results showed that an appropriate clamping torque range should be considered carefully to enhance performance without narrowing down fuel flow channels. Under a torque of 2.0 kgf . cm, peak power density for this stack is 122.5 mW/cm(2) at 2.0 V. Increase in fuel flow rate is not the best way to improve concentration polarization in this air-breathing stack experiment because of limited air supply, and each cell in the same stack has a different performance under the present arrangement. At present, such stack can maintain a stable power output for a long time (up to 14 hours).
The Numerical Study of Geometric Influence of Flow Channel Patterns on Performance of Proton Exchange Membrane Fuel Cells
(2012-04-01)
Chen, Chiun-Hsun
;
Chen, Chang-Hsin
;
Chen, Tang-Yuan
;
機械工程學系
;
Department of Mechanical Engineering
This study numerically investigates how the geometry of flow pattern influences performance of proton exchange membrane fuel cell (PEMFC), and analyzes how these parameters lead to different distributions of model variables. The investigation focuses on the impact of different bend angle and width of serpentine flow channels and tests how they improve the performance. Three-dimensional simulations are carried out with a steady, two-phase, multicomponent and electrochemical model, using CFD-ACE+, the commercial CFD code. Through simulation with various bend angles and widths, the results show that the combination of 60 deg and 120 deg for flow pattern achieves the highest performance at low operating voltage regime, and flow pattern with wider bend width also produces more current at low operating voltages. Plots of current density indicate that high current density locates at the bending areas of the channels. Therefore, the out-put current densities of each pattern are improved from the change of bend angle and width. [DOI: 10.1115/1.4005615]