Modelling and Simulation of the Straight and Convergent shape of Inlet headers for the High Temperature Proton Exchange Membrane Fuel Cell Stack.

• Main Authors: MANCHALA GOPALA KRISHNA, 馬銘宏
• Other Authors: WEI-CHIN CHANG
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/w4np44

碩士 === 南臺科技大學 === 機械工程系 === 107 === High-temperature Proton exchange membrane fuel cells operate at a temperature of 100-200ºC. It has many advantages compared with well-known low-temperature proton exchange membrane fuel cells, those operating temperature ranges are below 100ºC. Since high-temperature PEM fuel cells have advantages such as high carbon monoxide tolerance, low or zero carbon emission removal from the system. So these fuel cells were examined as the next generation of fuel cells. In the way to obtain the high performance, HTPEMFC system should be optimized in terms of channel dimensions, materials, operating conditions and other parameters. The performance of the HTPEMFCs depends on the following factors such as fuel cell design and assembly, operating conditions, flow field design used at the cathode and anode side plates. The flow field geometry is one of the main important factors influencing the performance of HTPEMFC. The fields have shown significant effects on pressure and flow distribution inside the stack. The uniform distribution of the reactant gases across the membrane catalyst active area, it leads to improving the electrochemical and causes to increase the performance of the fuel cell. So, the flow field design is one factor to get the better performance of the HTPEMFC in terms of efficiency. Modelling can help to find the effects of different flow design parameters and operating conditions on the performance of the fuel cell. In this study, a3D model of high-temperature proton exchange membrane fuel cell was developed. This model was implemented as an isothermal state. The model considers two different input header shapes of the stack, and they are simulated by using Ansys fluent 19 software. Scope of this research can see a positive effect from the convergent header on the performance of the HT PEMFC compared with the traditional straight header. It has shown uniform flow distribution in the fluid flow channels and reduces the pressure drop with the effects of meshing strategy; it has found that the results were more accurate with the help of small size of mesh elements.