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자료유형
학술대회자료
저자정보
황성훈 (서울대학교) 김범준 (서울대학교) 김성일 (서울대학교) 김민수 (서울대학교)
저널정보
한국자동차공학회 한국자동차공학회 추계학술대회 및 전시회 2012년 한국자동차공학회 학술대회 및 전시회
발행연도
2012.11
수록면
2,386 - 2,390 (5page)

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이 논문의 연구 히스토리 (5)

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In order to commercialize PEM fuel cell system in automotive industry, a lot of problems that are now being faced must be solved. Among these problems, stack cooling problem at high power range is one of the most critical problems. In case of when the PEMFC operates at high power range, the amount of generated heat is similar to electricity output of maximum over 100kW. Large amount of generated heat is very critical especially in the automotive PEMFC system. Because vehicles have limited inner space, heat exchanger and gas humidifier can’t be enlarged sufficiently. This constraint on the size of heat exchanger and gas humidifier leads to lack of stack cooling and decrease of electricity generation efficiency. Then lower efficiency makes the amount of generated heat larger and it brings about stack overheating. Continuous stack overheating accelerates membrane degradation and it can be fatal damage to membrane durability that leads to decrease of vehicle durability, reliability and performance. To solve this problem water direct injection method is used in this study. The water atomizing chamber with ultrasonic transducer is installed right before the stack of air supply line and atomized fine water droplets are directly injected into the channel by air flow momentum. Fine water droplets in the stack air flow channel absorb surrounding heat and then evaporate to vapor phase. By releasing the latent heat required in process of evaporating, stack inner temperature cooled down. And evaporated water vapors bring additional membrane humidification effect so efficiency of PEMFC stack increased. In this study, the experiments are performed according to the relative humidity of supply air, water direct injection flow rate at varied current density range.

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Abstract
1. 서론
2. 이론적 고찰 및 가정
3. 실험
4. 결론
References

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UCI(KEPA) : I410-ECN-0101-2014-556-000411783