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공기극 채널 형상이 직접 메탄올 연료전지의 성능에 미치는 영향
황용신(Hwang, Yong-Sheen),최훈(Choi, Hoon),차석원(Cha, Suk-Won),이대영(Lee, Dae-Young),김서영(Kim, Seo-Young) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
We consider the optimum air flow channel design for DMFC's in the present study. The effect of pressure drop across the inlet and outlet of a stack on the performance of a DMFC is the optimization of such geometric parameters is crucial to minimize the parasitic power usage by the auxiliary devices such as fuel pumps and blowers. In this paper, we present how the pressure drop control can optimize the driving point of a DMFC stack. Further, we show how the optimal fuel utilization ratio can be achieved, not degrading the performance of DMFC stacks. Overall, we discuss how the flow channel design affects the selection of balance of plant(BOP) components, the design of DMFC systems and the system efficiency.
연료극 왕복유동이 직접 메탄올 연료전지에 미치는 영향에 대한 해석적 연구
황용신(Hwang, Yong-Sheen),이대영(Lee, Dae-Young),김서영(Kim, Seo-Young),최훈(Choi, Hoon),차석원(Cha, Suk-Won) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
This study considers the feasibility of the concentration control of the methanol solution by oscillating flow in the anode channel of passive type Direct Methanol Fuel Cells(DMFC). DMFC stack performance is largely influenced by the fuel concentration. If the fuel concentration is either lower than 0.5M or more than 2M, its performance deteriorates seriously because of the fuel starvation or the fuel crossover. In this respect the optimization of the fuel concentration is crucially important to maximize the DMFC stack performance. In this work, the effects of oscillating actuation in the fuel supply are studied to control the fuel concentration. Two important nondimensional parameters are introduced, each of which represents either the oscillating frequency or the oscillating amplitude. It is shown how these factors affect the stack performance and the efficiency of the DMFC stack.
황용신(Hwang, Yong-Sheen),이대영(Lee, Dae-Young),김서영(Kim, Seo-Young),최훈(Choi, Hoon),차석원(Cha, Suk-Won) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
This study considers the feasibility of the concentration control of the feul and air by oscillating flow in the channel of Fuel Cells. Fuel Cell Stack performance is largely influenced by the fuel and air concentration. If the fuel and air concentration is lower than stoichiometry 1.25 of the fuel and 2.5 of the air, its performance deteriorates seriously because of the fuel and air starvation. In this respect the optimization of the fuel and air concentration is crucially important to maximize fuel cell stack performance. In this work, the effects of oscillating actuation are studied to control the concentration. Two important nondimensional parameters are introduced, each of which represents either the oscillating frequency or the oscillating amplitude. It is shown how these factors affect the stack performance and the efficiency of the fuel cell stack stack.
황용신(Hwang, Yong-Sheen),이주형(Lee, Ju-Hyung),지상훈(Ji, Sang-Hun),박준호(Park, Jun-Ho),이대영(Lee, Dae-Young),차석원(Cha, Suk-Won) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
This study considers the feasibility of using the low cost assembled separator. The graphite plate has been widely used as the separator in the field of PEMFCs(Polymer electrolyte membrane fuel cell) industry because of its excellent material properties such as good corrosion resistance, good electrical conductance and so on. However, there are some problems for the commercialization due to its poor cost effectiveness for the large volume manufacturing and lack of mechanical strength. From this respect, this study has focused on the manufacturing technology in order to reduce the price for the commercialization of separator. This study also shows that the assembled separator of the suggested structure, which is composed of grafoil and PC(PolyCarbonate) materials, could be manufactured at low cost enough for the mass production. The flow fields produced by cutting foils and the base plates of the separators were simply made by mechanical work.
연료전지 내에서의 왕복유동을 이용한 확산증대 효과에 대한 연구
황용신(Yong-Sheen Hwang),최종원(Jong Won Choi),이대영(Dae-Young Lee),김민수(Min Soo Kim),이대흥(Deaheung Lee),김서영(Seo-Young Kim),조성호(Sung Ho Cho),차석원(Suk-Won Cha) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.2
본 연구에서는 진동자를 이용하여 채널 내 공기 중 산소의 확산을 증대시키는 방법을 고안하였다. 왕복유동 시 물질 전달을 지배하는 두 가지 요소인 왕복 유동 주파수와 왕복 유동 거리가 채널 내의 길이방향 확산에 어떤 영향을 미치는지에 대해 선행연구 결과를 이용한 이론적 해석을 통하여 보여주었으며, 이러한 채널내의 길이방향 확산 량의 증가가 스택 성능에 미치는 영향에 대해 알 수 있었다. 스택의 채널 내의 길이방향 확산량은 연료전지가 반응하는 반응량에 비례하게 되며, 따라서 스택내의 길이방향 확산 량을 늘려주는 만큼 연료전지의 최고 파워 밀도가 늘어나게 된다. 이러한 길이방향 확산 량을 증가시키기 위해서는 왕복 유동이 좋은 방법이 되며, 연료전지 운전 시 왕복 유동의 주파수를 증가시키게 되거나 왕복 유동의 거리를 증가시킬수록 채널 내의 길이방향으로 확산 량이 증대되게 된다. This study considered the feasibility of controlling the air concentration by oscillating flow in fuel cell channels. The fuel cell stack performance is largely influenced by the air concentration. If the air concentration is lower than 2.5 times the stoichiometric of the inlet air, the fuel cell stack performance seriously deteriorates because of air starvation. In this respect, optimizing the air concentration is crucially important to maximizing the fuel cell stack performance. In this work, the effects of oscillating actuation were studied to control the concentration. Studies have shown that there are two non-dimensional key parameters related to the frequency and oscillating amplitude. This paper presents how those parameters affect the performance of the stack.
연료전지 내에서의 왕복유동을 이용한 확산증대 효과에 대한 연구
황용신(Yong-Sheen Hwang),최종원(Jong Won Choi),이대흥(Deaheung Lee),차석원(Suk-Won Cha),김민수(Min Soo Kim),조성호(Sung Ho Cho),김서영(Seo-Young Kim),이대영(Dae-Young Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This study considers the feasibility of the concentration control of the air by oscillating flow in the channel of Fuel Cells. Fuel Cell Stack performance is largely influenced by the air concentration. If the air concentration is lower than stoichiometry 1.25 of the fuel and 2.5 of the air, its performance deteriorates seriously because of the air starvation. In this respect the optimization of the air concentration is crucially important to maximize fuel cell stack performance. In this work, the effects of oscillating actuation are studied to control the concentration. Studies have introduced that there are two non-dimensional key parameters related with frequency and oscillating amplitude. It has been shown how those parameters affect the performance of the stack.
Nafion 115를 사용한 DMFC MEA 의 성능실험
최훈(Choi, Hoon),황용신(Hwang, Yong-Sheen),차석원(Cha, Suk-Won) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
To find out the optimum design of hydrogen storage and supply tank using Metal Hydride (briefly MH) and to make clear the performance characteristics under various conditions are our research purpose. In order to use the low-temperature exhaust heat, LaNi_{4.7}Al_{0.3} which operates under the low pressure of 1MPa is chosen, and we measure the basic properties, namely density, specific heat, PCT(Pressure-Concentration-Temperature) characteristic, and effective thermal conductivity. Then, a numerical calculation model of hydrogen storage using MH alloy is suggested and this thermal diffusion equation of model is solved by the backward difference method. This calculation results rate compared with the experimental results of the systems which installed 1kg MH alloy and, it is found out that our calculation model can well predict the experimental results. By the experimental using MH alloy, it is recognized that the hydrogen flow rate can control by the step adjustment of brine temperature.