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유틸리티 차량을 위한 연료전지 하이브리드 시스템 운전특성
이동율(Dongryul Lee),오성진(Sung-Jin Oh),정재화(Jaehwa Jeong),배중면(Joongmyeon Bae),이영기(Young-ki Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fel cell vehicles(FCV) will be one of alternative no-emission transportations. Batteries are usually hybridized with fuel cell to decrease electrical loads of fuel cell and take charge of randomly transient power. A DC/DC converter, 2㎾ PEMFC. and 24V batteries are included in 4㎾ FCV. Converter controls the power distribution ratio by mode change current defined in this study. The required power is divided by two control strategy modes. When the required power is lower than 2㎾e, fuel cell generates a proper power in power distribution mode 1. When the required power is higher than 2㎾e, batteries assist the insufficient fuel cell power in power distribution mode 2. This paper suggests some design issues for the stable operation of FCV.
고분자전해질 연료전지의 전해질 막을 통한 물의 이동의 영향에 관한 연구
이동율(Dongryul Lee),배중면(Joongmyeon Bae),박광진(Kwangjin Park) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
There are two main water transport phenomenon in the electrolyte of PEMFC. Electro-osmotic drag is resulted from the proton movements and let water transport from anode to cathode. Back diffusion is appeared by concentration difference and let water diffuse from cathode to anode. From these two water transport phenomenon, water activity and mole fraction of reactants are determined. Therefore net water transfer through membrane affects the membrane conductivity and activation loss which are main factors to have influence on the performance of PEMFC. If electro-osmotic drag is dominant, anode water activity is improved and the membrane maintains high ionic conductivity. However, if back diffusion is dominant, activation loss is increased because the mole fraction of oxygen is decreased. In this paper, it is considered that the relationships between net water movement and current density distribution. If it is possible to measure net water transfer per proton, this paper may suggest the method to guess current density distribution.