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MEA내 물 농도구배를 고려한 준 3차원 고분자 전해질형 연료전지 동적 모델링 개발
강상규(Sanggyu Kang),민경덕(Kyoungdoug Min) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A quasi three-dimensional dynamic model of a proton exchange membrane fuel cell (PEMFC) with considering the gradient of water concentration in the MEA has been developed by using the Matlab/Simulink<SUP>®</SUP>, The new PEM model is that of a single 240 ㎠. The cell is discretized into control volumes in the flow cross-section as well as along the stream-wise direction. In order to investigate the distribution of water concentration of the MEA in detail, the GDL was discretized into three control volumes in the model. The pseudo-homogenous model is adopted to investigate the oxygen diffusion and electrochemical reaction in the cathode catalyst layer. Through first principles physical modeling of mass transport, electrochemical reactions, and energy transfer, the model can resolve the local voltage response, current generation, species mole fractions, temperature, and membrane hydration of the PEMFC dynamically. Moreover the model can simulate transients in electrical load, inlet flow conditions, and other parameters to provide the insight into the local dynamic performance of a PEMFC. In order to validate the model, the polarization parameters were tuned to match one experimental operating point of the fuel cell. With this tuning, the model was shown to predict well the voltage current (V-I) behavior for the full range of cell operating current. The distribution of local current density, species mole fraction, membrane water hydration, and temperature is captured. Moreover, the gradient of the water concentration in the GDL was captured.
공기, 수소, 냉각수 입구 구성이 고분자 전해질형 연료전지의 성능에 미치는 영향
강상규(Sanggyu Kang),민경덕(Kyoungdoug Min) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The configurations of fuel, air, and cooling water path is one of the major factors of performance of PEM fuel cell stack. In order to investigate this effect, quasi three-dimensional dynamic model of a PEM fuel cell has been developed using the Matlab/Simulink. Unit cell was discretized into in cross sectional and stream wise direction to investigate local dynamic performance. The pressure drop in the anode and cathode flow is considered. In order to validate this model, simulation result was compared to the experimental data in one case of flow configuration and simulation result was well matched with the experimental data. Several different cases of flow configuration were simulated to systematically investigate the configuration effect of air, fuel, and cooling water on local current and species distribution.
강상규 ( Kang Sang Gyu ) 한국방송통신대학교 통합인문학연구소 2017 통합인문학연구 Vol.9 No.2
21 매우 긴박하게 돌아가고 있다. 각국은 경쟁과 협력의 길보다 갈등과 대결 양상으로 나가고, 공격적인 민족주의자의 주장들이 언론을 통해 자극적으로 소개되고 있다. 경색된 남북관계, 북핵문제, 한-미, 한-중, 한-일관계는 얽혀서 해결의 실마리가 보이지 않는다. 이러한 상황에서 한국은 어떻게 국제관계를 풀어가며, 어떻게 미래를 대비해야할 것인가? 이용희 박사는 백 년 전 한반도에서 태어나 격동의 시대를 경험하면서 한반도의 미래를 고민했던 학자였다. 그는 서양의 정치학이나 국제정치학이 한반도의 미래를 해결하는 답안을 제시하지 못한다는 문제의식을 갖고, 우리의 문제를 깊게 파고들었다. 그러나 그의 학문세계와 통찰력은 한국의 학계에 널리 확산되지 못하였다. 이 논문은 이용희 박사의 탄생 백주년을 맞아, 그의 정치학이 갖는 큰 틀과 깊이를 이해하는데 도움이 될 수 있도록, 그의 방대한 학문체계를 `국제정치학`과 `민족주의`를 씨줄과 날줄로 삼아 핵심체계를 재구성한 글이다. The international situation surrounding the Korean Peninsula in the 21<sup>st</sup> century is highly tense. Each country opts for conflicts and confrontations, rather than competition and cooperation. Aggressive nationalists` opinions have been introduced provokingly on the media. There seems to be no clue to the solution to the tightly tangled South-North relations, North Korean nuclear problem, and the respective relations of South Korea-U.S., South Korea-China, and South Korea-Japan. In the current situation, how could South Korea disentangle the international relations and how should it prepare for the future? Dr. Lee, Yonghee was a scholar, born on the Korean Peninsula a hundred years ago. He experienced the age of turbulence and agonized over the future for the Peninsula. He was aware of the problem that the western politics or science of international politics did not provide an answer for the Peninsula`s future, and he burrowed deep into our problem. However, Dr. Lee`s research and insights do not appear to have spread in the academia of Korea. This paper, commemorating the centennial anniversary of Dr. Lee`s birth, recasts his extensive study and research, consisting mainly of `international politics` and `nationalism` which serve as the weft and warp. It would help to understand the vast framework and depth of Dr. Lee`s politics.
차량을 위한 고분자 전해질형 연료전지 시스템의 동적 모델링
강상규(Sanggyu Kang),민경덕(Kyoungdoug Min) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Water and thermal management are crucial factors to determine the performance of the PEMFC for automotive application. In order to investigate the effect of cell humidity and temperature on the performance of PEMFC, a dynamic model of a PEMFC system for automotive application has been developed by using the Matlab/Simulink™. The model is composed of a PEM unit cell, shell and tube humidifier, and thermal management system. The fuel and air is well hydrated by the shell and tube humidifier. Then, humidified fuel and air flows into the PEMFC for electrochemical reaction. And the PEMFC was maintained the constant temperature by the thermal management system. The active area of PEM model is 240 ㎠. The cell was discretized into several control volumes in the through-plane to resolve energy balance and species diffusion. The shell and tube humidifier model is also discretized into three control volumes in the through-plane to resolve the mass conservation and energy balance. The fuel and air is hydrated by the diffusion of the water through the membrane. The thermal management system consists of radiator, fan and pump. Deionized water cools down the temperature of PEMFC. In order to validate the model, the model was compared with experiment. Comparison show simulation result well predicts the experimental data. And the dynamic response of PEMFC with regard to the change of current was also investigated. The instantaneous current decrease is lowering its membrane water content which results in decreasing the relative humidity of the air. Since the required air flow rate is decreasing at the low load condition, the air relative humidity is slightly increased. Thus the cell slightly recovers its membrane water content. It is expected this dynamic modeling of PEMFC system can contribute to the optimized design of PEM fuel cell system for vehicle application.