Pil Hyong Lee
Incheon National University
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Publication
Featured researches published by Pil Hyong Lee.
Sensors | 2009
Pil Hyong Lee; Sang Soon Hwang
In fuel cells flow configuration and operating conditions such as cell temperature, humidity at each electrode and stoichiometric number are very crucial for improving performance. Too many flow channels could enhance the performance but result in high parasite loss. Therefore a trade-off between pressure drop and efficiency of a fuel cell should be considered for optimum design. This work focused on numerical simulation of the effects of operating conditions, especially cathode humidity, with simple micro parallel flow channels. It is known that the humidity at the cathode flow channel becomes very important for enhancing the ion conductivity of polymer membrane because fully humidified condition was normally set at anode. To investigate the effect of humidity on the performance of a fuel cell, in this study humidification was set to 100% at the anode flow channel and was changed by 0–100% at the cathode flow channel. Results showed that the maximum power density could be obtained under 60% humidified condition at the cathode where oxygen concentration was moderately high while maintaining high ion conductivity at a membrane.
Journal of The Korean Chemical Society | 2008
Pil Hyong Lee; Sang-Seok Han; Sang-Soon Hwang
Many researches for effects of different flow configurations on performance of Proton Exchange Membrane Fuel Cell have extensively been done but the effects of flow direction at the same flow channel shape should be considered for optimal operation of fuel cell as well. In this paper a numerical computational methode for simulating entire reactive flow fields including anode and cathode flow has been developed and the effects of different flow direction at parallel flow was studied. Pressure drop along the flow channel and density distribution of reactant and products and water transport, ion conductivity across the membrane and I-V performance are compared in terms of flow directions(co-flow or counter-flow) using above numerical simulation method. The results show that the performance under counter-flow condition is superior to that under co-flow condition due to higher reactant and water transport resulting to higher ion conductivity of membrane.
Journal of Power Sources | 2008
Son Ah Cho; Pil Hyong Lee; Sang Seok Han; Sang Soon Hwang
Renewable Energy | 2012
Sang Soon Hwang; Pil Hyong Lee; Soon Hye Jo; Chun Loon Cha; Seong Weon Hong; Sang Seok Han; Ja Ye Koo
Journal of Thermal Science and Technology | 2010
Sang Soon Hwang; Sang Seok Han; Pil Hyong Lee; Bong Il Park
Journal of Thermal Science and Technology | 2013
Pil Hyong Lee; Sang Soon Hwang
Journal of the Korean Society of Combustion | 2013
Seong Weon Hong; Pil Hyong Lee; Sang Soon Hwang
Sensors | 2008
Pil Hyong Lee; Sang Seok Han; Sang Soon Hwang
International Journal of Hydrogen Energy | 2016
Pil Hyong Lee; Sang Soon Hwang
Journal of the Korean Society of Combustion | 2012
Pil Hyong Lee; Sang Soon Hwang