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주택용 연료전지 연료전지 운전방법에 따른 계간 성능 분석
이원용(W.-Y. Lee),정귀성(K.-S. Jeong),손영준(Y.-J. Sohn),엄석기(S.-K. Um),황정태(J.-T. Hwang),김창수(C-S Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Fuel cell systems(FCSs) have potential to achieve a financial and environmental advantage over competing technologies. For use in residences and buildings FCSs can provide useful heating/hot water and electricity generation at a high overall efficiency. In this study, a 1.5Kw-class Polymer electrolyte fuel cell system(PEFCS) with a battery pack has been modelled and simulated. Its electric conversion efficiency and heat recovery performance are highly dependent on the seasonal thermal and electric load of a residence. Seasonal average fuel saving rates are calculated to find proper load management methods. The scheme can be used to determine the optimal capacity and operating strategies of PEFCS.
이원용(W. Y. Lee),원승호(S. H. Won),정헌생(H. S. Chung) 한국태양에너지학회 1990 한국태양에너지학회 논문집 Vol.10 No.3
주어진 열원에서 유기 랭킹 사이클 시스템을 통해 얻을 수 있는 최대 출력 조건에서의 최적 효율을 구하기 위한 이론식을 유도하였으며, 이것이 작동 유체의 열물성치에 의한 엔탈피를 기초로 하여 계산된 열효율과 비교하여 잘 일치되는 것을 확인하였다. 본 연구에서 유도된 결과식에 의해 최대 출력은 열원의 열용량과 초기 온도 그리고 핀치점 온도차만의 함수임을 알 수 있었으며, 이 때의 효율은 열원의 열용량과 관계없이 입열원과 방출열원 초기 온도와 핀치점 온도차의 함수임을 알 수 있었다. 여기서 구한 최대 출력시의 효율식은 실제 랭킨 사이클 시스템의 설계를 위한 최적 설계지표로 사용될 수 있으며 실제 발전소의 성능 예측을 위한 최적 효율로도 사용될 수 있을 것이다. An analytical equation to estimate the Rankine power cycle efficiency at maximum power for the given mass flow rates of heating and cooling fluids is derived. The accuracy of the result is shown by comparing the analytical values with those calculated one using detailed thermodynamic data. The results indicate that the thermal efficiency at maximum power depends primarily on the initial temperatures of the heating and cooling fluids, and it also depends on the pinch-temperature differences between the working fluid and the heating and cooling fluids. The efficiency at maximum power provides a measure of the power available in a practical Rankine heat engine.
김동하(D.-H. Kim),함미숙(M.-S. Ham),김민진(M. Kim),유상필(S. P. Yu),엄석기(S. Um),이원용(W.-Y. Lee),김창수(C.-S. Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The fuel cell for a submarine is a closed system and therefore the unreacted hydrogen and oxygen are supposed to be recycled and reused. Generally, the compressors, the blowers, the pumps and the ejectors have been used as the recirculation equipment of a fuel cell system. In case of the vehicle application, the ejector which does not require any parasitic power is good for the performance of the fuel cell system. The ejector has been applied to a solid oxide fuel cell (SOFC) from now on. In case of SOFC, the ejector is designed to maintain the pressure required in fuel cell by compensating the pressure drop in the anode channel. However, the existing research works do not consider about the humidified hydrogen and oxygen which is occurred by electrochemical reaction at proton exchange membrane fuel cell (PEMFC). Unlike dry air, the humidified hydrogen and oxygen shows very complex behaviours in suction chamber and constant-area section. In this study, the ejector for the PEMFC used to the submarine is designed taking into account the property of the gas mixed with vaporized water and hydrogen/oxygen. Consequently, the designed ejector shows the optimal performance within the predefined operating conditions at the PEMFC for a submarine.
데칼법으로 제조된 고분자 연료전지용 전극 막 접합체의 성능평가
류성관(Ryu, S.K.),박석희(Park, S.H.),윤영기(Yoon, Y.G.),이원용(Lee, W.Y.),김창수(Kim, C.S.) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
전극 막 접합체를 만드는 방법 중 연속식 공정으로서의 데칼법의 장점은 제조공정의 단순화와 두께 균일성 그리고 대량생산 등을 그 예로 들 수 있다. 본 실험에서는 코터를 이용해 전극 막 접합체를 만들기 위해 높은 점도의 촉매 슬러리를 제조하였다. Johnson Mattey 사의 HiSPEC 40 wt% Pt/C 촉매와 Dupont사의 20 wt% Nafion Solution 그리고 물을 이용하여 촉매 슬러리를 제조한 후 코터를 이용하여 데칼법으로 전극 막 접합체를 제조하였다. 완성된 전극 막 접합체의 성능 평가를 실시하였으며 상용화된 전극 막 접합체와 그 특성을 비교 분석을 실시해보았다.
유상필(S. P. Yu),엄석기(S. Um),박구곤(G. G. Park),김민진(M. J. Kim),임성대(S. D. Yim),조중원(J. W. Cho),이원용(W. Y. Lee),김창수(C. S. Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
PEMFC(polymer electrolyte membrane fuel cell) is a promising solution for H₂ energy society. Especially, residential PEMFC system has been developed competitively for its relatively easier proliferation with existing natural gas supply network. We have developed 1㎾ residential PEMFC system with natural gas reformer and tested for its performance and endurability corroboratively.
Microchannel Reformer for Micro Fuel Cell
S.P.Yu(유상필),S.D.Lim(임성대),Y.K.Yoon(윤영기),W.Y.Lee(이원용),C.S.Kim(김창수) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Micro PEMFC(Proton Exchange Membrane Fuel Cell) needs to be supplied with high purity hydrogen to produce electricity. Each microstructured stainless steel foil for the purpose of micro reformer was brazed in vacuum for stacking. Inner surface of micro channels was coated with Al₂O₃ layer to support reforming catalysts by sol-gel method. The stack reactor was designed like a heat exchanger to perform the combination of exothermic and endothermic reactions simultaneously. As the first step in our study, we measured experimentally the heat transfer rate and the conversion of the reaction in the channels. The combustion heat of LPG-air was transferred to the other channels where cold air flowed. As a consequence, quantitative and qualitative thermal characteristics of the stack for reaction were investigated.