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압력조건의 변화에 따른 PEMFC의 성능 시뮬레이션 및 설계에 관한 연구
김홍건(H. G. Kim),김유신(Y. S. Kim),김홍열(H. Y. Kim),양성모(Y. M. Yang),나석찬(S. C. Nah) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
Fuel cells are devices that convert chemical energy directly into electrical energy. Among many kinds of the fuel cell, Polymer electrolyte membrane fuel cell is such kind of thing which work under low temperature. Unfortunately, there are still many problems to be solved in order to make them into commercial use, such as the thermal and water management in working process of Polymer electrolyte membrane fuel cell. To solve the difficulties facing the researcher, the analysis of the inner mechanism of Polymer electrolyte membrane fuel cell should be implement as much as possible, mathematical modeling is an important tool for the reach of the fuel cell especially with the combination of experiment. By regarding some of the assumptions and simplifications, using the finite element technique, a two-dimensional electrochemical mode is created in this paper for the further comparison with experiment data. Based on the principals of the problem, the equation of electronic charge conservation equation, gas-phase continuity equation, and mass balance equation are used in calculating. In the end, the model results indicate the some of the phenomenon in the unit cell, and the relationships of potential and current density.
연료전지용 터보압축기 회전축의 동특성 해석에 관한 연구
김홍건,나석찬,김성철,강영우,양균의,이희관,최문창 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.1
A 3-D EM (Finite Element Method) analysis of the turbe-blower shaft attached to a fuel cell was performed using Lanczos algorithm. The modal analysis was analyzed in order to investigate natural frequency and maximum displacement for 10 times. It was found that the first mode of natural frequency is 109.1Hz with the maximum displacement of 0.16mm while the tenth mode of natural frequency is 2464Hz with the maximum displacement of 0.25mm. Consequently, the results of modal analysis of the turbo-blower for a fuel cell system show good dynamic responses.
김홍건,김유신,김홍열,양성모,나석찬 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
An experimental study is performed to evaluate the performance and the efficiency by humidifying MEA and by making the double-tied catalyst layers in a fuel cell system which is taken into account the physical and thermal concept. An electrical output produced by PEFC(Polymer Electrolyte Fuel Cell) is measured to assess the performance of the stack and the efficiency is also evaluated according to the different situation in which is placed with and without the humidification of MEA(Membrane Electrolyte Assembly). Subsequently, It is found that the measured values of stack voltage and current are influenced by the stack temperature, humidification, and the double-tied catalyst layers which gives more enhanced values to apply for electric units.
김홍건,양성모,노홍길,나석찬,유기현,조남익 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.2
A strategy of the optimal shape design with FEA (finite Element Analysis) for 2-D structures is proposed by comparing subproblem approximation method with first order approximation method. A cantilever beam with two different lading conditions, a concentrated load and an evenly distributed load, and truss structure with a concentrated loading condition are implemented to optimize the shape. It give a good design strategy on the optimal truss structure as well as the optimal cantilever beam shape. It is found that the convergence is quickly finished with the iteration number below ten. Optimized shapes of cantilever beam and truss structure are shown with stress contour plot by he results of the subproblem approximation method and the first order approximation method.
김홍건,양성모,노홍길,나석찬,강영우 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
An analysis of the turbe-blower shaft attached to fuel cell using 3-D FEA (Finite Element Analysis) is proposed by Lanczos algorithm. The modal analysis was performed in order to investigate natural frequencies for 10 times. It is found that the first mode of natural frequency is 111.243 and the maximum displacement is 0.16mm. Consequently, It is found that the dynamic design of turbo-blower shows a good responses transiently.