The Effects of the Parameters on the Performance of HT-PEMFC
The high temperature proton exchange membrane fuel cell (HT-PEMFC) is widely paid attention to due to the characteristics of simple water management, high intolerance of CO and high utilization of heat. In order to discover the effects of different operating factors on the performance of HT-PEMFC, several sets of experiments based on pyridine polymer were carried out in the testing system testing VI curves. The experimental results show that the fuel cell temperature affects enormously on the performance of the HT-PEMFC; humidification of reactant on the performance is almost negligible, which contribute to the understanding the working mechanism of HT-PEMFC.
ABSTRACT A study of appropriate sizes of both porous and solid blocks mounted on a heated region impinged by a laminar slot jet was investigated numerically. A numerical method of SIMPLEC is adopted to solve governing equations, and a one-equation thermal model with Van Driest's wall function is considered for solving the energy equation of the porous block. The results indicated that enhancement of heat transfer is obtained for both shorter porous and solid block cases and decreasement of heat transfer occurs for longer block cases. Compared with the without block case, there exists an appropriate length of the porous block to gain the maximum thermal enhancement efficiency. As for the solid block case, as the length becomes shorter, the thermal enhancement efficiency becomes better.