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상대습도 변화에 따른 PEM Fuel Cell 내에서의 플러딩에 관한 실험적 연구
김경록(Kim KyoungRock),한성호(Han SeongHo),안득균(Ahn DeukKuen),최영돈(Choi YoungDon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
This is the experimental research that tries to explain a variety of RH is how to affect the cell performance and the flooding phenomenon of proton exchange membrane fuel cell (PEMFC). A value of RH changes to 0%, 50% and 90% as its variation, either stoichiometric flow rate changes to 1.5, 2 and 4. Into the comparison between theoretical and experimental value, this study analyzes that a variety of RH is how to affect flooding in the cathode of the proton exchange membrane fuel cell. The effect of air stoichiometry, air humidity and different flow fields are also discussed in this paper. This study has accomplished the measurement of performance as the variety of RH in the cathode of proton exchange membrane fuel cell, moreover it has recorded the visualization of flooding in the cathode with a high-speed micro camera.
Stoichiometry 변화에 따른 PEMFC내에서의 플러딩에 관한 실험적 연구
한성호(Han SeongHo),김경록(Kim KyoungRock),최영돈(Choi YoungDon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This is the experimental research that tries to explain a variety of stoichiometry is how to affect the performance and the flooding phenomenon of proton exchange membrane fuel cell. A value of stoichiometry changes to 1.2, 2.0 and 2.5 as its variation, either a temperature of cell changes to 50, 60 and 70. Into the comparison between theoretical and experimental value, this study analyzes that a variety of stoichiometry is how to affect flooding of cathode in the proton exchange membrane fuel cell. The effect of air stoichiometry, cell temperature, air humidity, different flow fields are also discussed in this paper. This study has accomplished the measurement of performance as the variety of stoichiometry in the cathode of proton exchange membrane fuel cell, moreover it has recorded the visualization of flooding in the cathode with a high-speed micro camera.
조홍기(Honggi Cho),김태헌(Tae-Hun Kim),홍순철(Soon-Cheol Hong),김경록(Kyoungrock Kim),김중호(Jungho Kim),이창선(Changseon Lee) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
The objective of present work is to investigate the performance of enhanced tubes with inner grooves by using a commercial CFD program. Four different enhanced tubes have been studied. G_0 and G_max tubes have no inner grooves on their inner surfaces, therefore, their inner surfaces are smooth. The inner diameter of G_0 and G_max are 8.9 mm and 9.9 mm, respectively. G_6 has 6 inner grooves and G_12 has 12 inner grooves. For all enhanced tubes, Serrated fins are manufactured on their outside surfaces and the inner groove is 1.0mm in width and 0.5mm in depth. As the number of inner grooves increase from 0 to 6 and 12, the pressure drops for G_6 and G_12 increased by 18% and 20% and the heat transfer rates increased by 7% and 14% under the mass flow rate of 189 kg/hr. In case of G_max, pressure drop and heat transfer rate decreased by 29% and 6% than those of G_0, because G_max have no inner grooves and its diameter is larger than that of G_0 by 1.0 mm.