http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 임세준 ( Se Joon Im ) (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
연료전지 차량의 냉시동성 개선을 위한 금속 분리판 표면의 바나듐 산화물 박막 제조 및 특성 분석에 관한 연구
정혜미(Hye-Mi Jung),노정훈(Jung-Hun Noh),임세준(Se-Joon Im),이종현(Jong Hyun Lee),안병기(Byung Ki Ahn),엄석기(Sukkee Um) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Cold-start capability of polymer electrolyte fuel cells is a major technical challenge for fuel cell vehicles in a subzero environment. In this study, vanadium oxide thin films deposited onto the flat surface of 316L stainless steel bipolar plates have been synthesized to investigate applicability as an efficient self-heating source for accelerating fuel cell stack temperature rise during subzero startup. The solid thin films have been prepared by the dip-coating technique via the hydrolytic sol-gel route and then the chemical compositions and microstructures of the films were analyzed by X-ray diffraction, X-ray fluorescence spectroscopy, and field emission scanning electron microscopy. In addition, it was carefully measured electrical resistance hysteresis loop and local surface temperature of the thin films over a temperature range from -20℃ to 80℃ by a fourterminal technique. It was found that thermal dissipation rate of the vanadium oxide thin films partially satisfy roughly 50% saving of the substantial amount of energy required for ice melting at startup temperature of - 20℃ and current density of 0.1 A/㎠.
-
연료전지 차량의 냉시동성 개선을 위한 금속 분리판 표면의 바나듐 산화물 박막 제조 및 특성 분석에 관한 연구
정혜미(Hye-Mi Jung),노정훈(Jung-Hun Noh),임세준(Se-Joon Im),이종현(Jong Hyun Lee),안병기(Byung Ki Ahn),엄석기(Sukkee Um) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.6
냉시동 성능 개선은 연료전지 차량의 고분자 전해질 연료전지 발전 모듈 및 시스템의 내구성과 신뢰성 향상의 측면에서 매우 중요하다. 이에 본 연구에서는 영하의 기후에서 연료전지 차량의 초기 구동 시 금속 분리판 표면에 형성된 바나듐 산화물 박막의 자기 발열 특성을 이용하여 신속한 온도 상승 구현이 가능한 냉시동 향상 기술을 제안하고, 실험적 방법을 통해 그 적용 가능성을 검증하였다. 졸-겔 침지 법에 의해 제조된 바나듐 산화물 박막의 특성 평가를 위해 X 선 회절, 광전자 분광, 전자 주사 현미경을 이용한 화합물 조성 및 미세구조 분석, 4-탐침법을 이용한 -20 ~ 80℃의 온도 구간에서의 온도-저항 이력 특성 분석을 각각 수행하였다. 본 실험 결과, 냉시동 조건에서 박막의 자기 발열량은 연료전지 내부의 생성 수 결빙 방지에 필요한 열 에너지를 모두 충족시킬 수 있음을 확인하였다. The enhancement of the cold-start capability of polymer electrolyte fuel cells is of great importance in terms of the durability and reliability of fuel-cell vehicles. In this study, vanadium oxide films deposited onto the flat surface of metallic bipolar plates were synthesized to investigate the feasibility of their use as an efficient self-heating source to expedite the temperature rise during startup at subzero temperatures. Samples were prepared through the dip-coating technique using the hydrolytic sol-gel route, and the chemical compositions and microstructures of the films were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and field-emission scanning electron microscopy. In addition, the electrical resistance hysteresis loop of the films was measured over a temperature range from -20 to 80℃ using a four-terminal technique. Experimentally, it was found that the thermal energy (Joule heating) resulting from self-heating of the films was sufficient to provide the substantial amount of energy required for thawing at subzero temperatures.
-
정혜미(Jung, Hye-Mi),노정훈(Noh, Jung-Hun),임세준(Im, Se-Joon),이종현(Lee, Jong Hyun),안병기(Ahn, Byung Ki),엄석기(Um, Sukkee) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
For the successful cold starting of a fuel cell engine, either internal of external heat supply must be made to overcome the formation of ice from water below the freezing point of water. In the present study, switchable vanadium oxide compounds as variable temperature-electrical resistance materials onto the surface of flat metallic bipolar plates have been prepared by a dip-coating technique via an aqueous sol-gel method. Subsequently, the chemical composition and micro-structure of the polycrystalline solid thin films were analyzed by X-ray diffraction, X-ray fluorescence spectroscopy, and field emission scanning electron microscopy. In addition, it was carefully measured electrical resistance hysteresis loop over a temperature range from -20?C to 80?C using the four-point probe method. The experimental results revealed that the thin films was mainly composed of Karelianite V₂O₃ which acts as negative temperature coefficient materials. Also, it was found that thermal dissipation rate of the vanadium oxide thin films partially satisfy about 50% saving of the substantial amount of energy required for ice melting at -20?C. Moreover, electrical resistances of the vanadium-based materials converge on an extremely small value similar to that of pure flat metallic bipolar plates at higher temperature, i.e. T{geq}40?C. As a consequence, experimental studies proved that it is possible to apply the variable temperature-electrical resistance material based on vanadium oxides for the cold starting enhancement of a fuel cell vehicle and minimize parasitic power loss and eliminate any necessity for external equipment for heat supply in freezing conditions.
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
