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FTP-75 사이클에서의 고분자 전해질형 연료전지 차량의 동적 시뮬레이션
강상규(Sanggyu Kang),민경덕(Kyoungdoug Min) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Dynamic behavior of a PEMFC is crucial factors to ensure safe and effective operation. In this work, FTP-75 (Federal Test Procedure) mode was used to investigate the dynamic response of the PEMFC system. 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<SUP>®</SUP>. The model is composed of a PEM unit cell, shell and tube humidifier, and thermal management system (TMS). PEM model considering two-phase transport was discretized into several control volumes in the through-plane to resolve energy balance, species conservation. The humidifier model was also discretized into two control volumes along the radial and axial direction. TMS consists of radiator, fan, and pump. The dynamic response of the PEMFC system was investigated by the simulation during the FTP-75 mode. In order to compare the simulation result with the experimental date, the velocity profile of the FTP-75 mode was compared to that from the FCEV model. The simulation results are in good agreement with the power profile with slight differences. It is expected this dynamic simulation of FCEV (Fuelcell Electric Vehicle) can contribute to establish the basic insight of developing the control strategy for vehicle application during various driving cycle.
강상규(Sanggyu Kang) 한국정치학회 2006 한국정치학회보 Vol.40 No.2
명성왕후와 흥선대원군의 정치적 ‘관계’를 심도 있게 파악하기 위해서는 국왕 고종의 정치사상과 리더십에 대한 새로운 이해가 불가피하다. 왜냐하면 기존의 명성왕후와 대원군의 ‘숙명’적인 적대자로서의 이미지와 ‘무능한 전제군주’ 고종의 이미지는 마치 동전의 양면처럼 하나의 세트로 형성되었기 때문이다. 따라서 본고는 다음과 같은 네 개의 부문으로 구성되어있다. 우선 우리들의 ‘기억’ 속에서 조선 왕실의 두 인물과 ‘무능한 전제군주’ 고종에 대한 이미지는 어떻게 형성되었는가(2장). 둘째, 조선의 왕권이라는 ‘구조’적인 차원에서 볼 때 두 사람의 정치적 위상의 특수성은 무엇이며 고종을 포함한 세 사람의 정치적 관계는 어떤 것이었는가(3장). 셋째, 고종은 어떤 경로를 통해 어떠한 정치의식과 대외관을 가지게 되는가(4장). 마지막으로 임오군란에 이르기까지의 구체적인 현실정치의 ‘과정’ 속에서 세 인물의 정치적 관계는 어떻게 전개되었는가(5장). 본고에서는 위의 질문들에 대한 답을 추적하는 방식으로 19세기 거대한 전환기에 직면한 조선왕실 내부의 정치적 관계에 접근하고자 했다. In order to reconsider the political relations between Queen Min and Daewongun, first of all we should understand King Kojong's political thought and leadership. Because the existing image of Queen Min and Daewongun as a fatal cat-and-dog antagonist and that of King Kojong as "an incompetent absolute monarch" have been formed simultaneously just like both sides of coin. This article consists of four parts as follows: firstly, how in our "memory" the existing image of them have been formed(chap.2), secondly, what on earth the uniqueness of political power of Queen Min and Daewongun is from the standpoint of the political "structure" inside of royal family(chap.3), thirdly, through what channel, what kind of political thought and foreign relations views came to being in the mind of King Koiong(chap.4). fourthly, through He "process" of real politics, how the political relations between this three persons developed specifically(chap.5). By searching for an answer to the above four questions, this article tries to reveal the political power relations in royal family during the period of "great transformation" in the late 19th century Korea.
가역적 고온 고체산화물 연료전지-수전해 시스템 성능해석
강상규(Sanggyu Kang),이상호(Sangho Lee),김영상(Youngsang Kim),이영덕(Youngduk Lee),안국영(Kook-Young Ahn) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Various types of the energy storage system (ESS) have been developing to compensate for the renewable power generation. The objective of the study is to develop the novel renewable hybrid system composed of the reversible solid oxide fuel cell (SOFC)/solid oxide electrolyser cell (SOEC) system and waste steam. In case of SOEC operation mode, the surplus electricity and the steam of 3 bar and 750 ℃ are supplied to the SOEC system to generate the hydrogen. The steam is generated by the boiler using the solid refuse fuel (SRF). The generated hydrogen is de-humidified by flowing through the heat exchanger and dryer, then heated and compressed to be stored at the metal hydride. In case of the SOFC operation mode, the hydrogen from the metal hydride enters to the SOFC system to generate the power. In order to improve the system efficiency, the off gas from the hydrogen electrode of the SOFC/SOEC system is recirculated by regenerative blower or ejector. And the system exhaust heat could be used for the hydrogen storage/release. The system analysis has been conducted to determine the system efficiency by Aspen Plus®. In order to achieve the system optimization, the efficiency of the various system configurations have been compared.
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.