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공기극의 조건의 변화가 막가습기를 포함한 고분자 전해질막 연료전지내의 물 함량에 미치는 영향에 대한 해석적 연구
김동규(Dongkyu Kim),서정훈(Jeonghoon Seo),김선엽(Seonyeob Kim),송한호(Hanho Song),김민수(Minsoo Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Polymer Electrode Membrane Fuel Cell s(PEMFCs) are largely used in vehicle such as automobile for high responsibility and high energy density. According to necessity of miniaturization of automobile, fuel cell systems operating in high pressure are used in these days. In order to reach high efficiency membrane humidifiers are also utilized in fuel cells. There are some needs to analyze water contents of this new concept fuel cell. By increasing pressure, activities in fuel cells are increased, this means that operation in high pressure have advantage in flooding. In addition, membrane humidifier can prevent dry out in PEMFCs. To suggest optimal pressure range for high efficiency, this study conducts numerical analysis of changes of efficiency of PEMFCs as changing activity in 1D, steady state. Also, this paper analyzes fuel cell performance with membrane humidifier as activity changing with pressure change.
터보차져를 이용한 연료전지 시스템의 효율 향상에 대한 수치 해석적 연구
김동규(Dongkyu Kim),서정훈(Jeonghoon Seo),김선엽(Seonyeob Kim),송한호(Hanho Song),김민수(Minsoo Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Parasitic power is a crucial factor in determining the total efficiency for pressurized fuel cell system. Generally, pressure is applied through compressor which consumes high power. This paper suggest novel system using turbocharger that has benefit in reducing compressor power. In order to investigate performance of this novel fuel cell system, steady state model of PEMFC system is developed adding turbocharger. The model is discretized into several part ? stack, membrane humidifier, compressor, thermal management system and extra device ? to resolve performance enhancement of the system. At first, the performance of simulation of general pressurized PEMFC system is analyzed in each model and whole integrated system. After that, novel system with turbocharger is analyzed in same process of that of general system. Finally, relations among whole parts are considered under various operating conditions. These results are useful to design the variable pressure PEMFC system model with turbocharger and find optimal operating condition under various current densities.