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동결/해동 열사이클이 PEFC의 GDL/MEA에 미치는 영향
임남윤(Lim, Nam-Yun),박구곤(Park, Gu-Gon),박진수(Park, Jin-Soo),윤영기(Yoon, Young-Gi),이원용(Lee, Won-Yong),임태원(Lim, Tae-Won),김창수(Kim, Chang-Soo) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.06
Proper water management is vital to achieve high performance and durability of PEFC (Polymer Electrolyte Fuel Cell). The effects of the residual water from PEFC after purge in shut-down processes on GDL/MEAs were investigated with freeze/thaw cycles Freeze/thaw cycle tests were conducted with single cells which were designed from transparent acryl plates. Single cells which contain several amount of residual water were cycles from 80?C to -28?C. The resistance changes of the single cells which have various amount of residual water were evaluated by ac-impedance analysis with 24 times of freeze/thaw cycles. Also, after the freeze/thaw cycles, the property changes were characterized by visual methods such as SEM, EPMA. Though it was difficult to observe noticeable property changes in the visual characterizations, the resistance of cells dramatically increased with the amount of remained water.
임남윤(Nam-Yun Lim),박구곤(Gu-Gon Park),이상준(Sang Joon Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Water management for PEFC (Polymer Electrolyte Fuel Cell) has been receiving large attention as an importance issue that should be researched for putting it to practical use. Proper water management is vital to achieve high performance and durability of PEFC. In this study, X-ray imaging technique was employed to visualize the water distribution in a PEFC to investigate its water management. The main objective of this study is to check the feasibility and usefulness of the X-ray imaging technique in the study of water management of PEFC.
X선 영상기법을 이용한 고분자 전해질형 연료전지의 수분분포 가시화
임남윤(Nam-Yun Lim),박구곤(Gu-Gon Park),김창수(Chang-soo Kim),이상준(Sang Joon Lee) 한국가시화정보학회 2007 한국가시화정보학회지 Vol.5 No.2
Water management in polymer electrolyte fuel cell (PEFC) has been receiving large attention as an important issue in practical applications. Proper water management is vital to achieve high performance and durability of PEFC. In this study, an X-ray imaging technique was employed to visualize the water distribution in a PEFC quantitatively. X-ray images of the PEFC components with and without water were distinguished clearly. From the visualized X-ray images, we could evaluate the water distribution in the region between separator and gas diffusion layer (GDL) quantitatively. In addition, the contact angle of water in the micro-channels was also clearly visualized.
박구곤(Park, Gu-Gon),임남윤(Lim, Nam-Yun),손영준(Sohn, Young-Jun),박진수(Park, Jin-Soo),이원용(Lee, Won-Yong),김세훈(Kim, Sae-Hoon),임태원(Lim, Tae-Won),김창수(Kim, Chang-Soo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Water management in polymer electrolyte membrane fuel cells(PEMFCs) is one of the most challenging issues. Freeze start-up in the automotive applications is also important research topic in the PEMFC field. Transportation of proton and separation of reactant gases are main roles of polymer electrolyte membranes. It has been known that water in the membrane conducts as a vehicle for the proton transportation. At sub-zero temperature, the frozen water blocks the access of reactant gases to the active sites of electrode as well as occurs the physical destruction of fuel cell structures. In this study, property changes of electrolyte membranes in the freeze conditions (at;-25?C) were investigated. For the various amount of water contained membranes, the property changes, especially for the proton conductivity, were observed after several times of freeze/thaw(-25~80?C) cycle.
고분자전해질 연료전지 체결조건에서 기체확산층의 특성변화 및 물거동 확인
박구곤(Park, Gu-Gon),임남윤(Lim, Nam-Yun),안은진(Ahn, Eun-Jin),박진수(Park, Jin-Soo),윤영기(Yoon, Young-Gi),이원용(Lee, Won-Yong),임태원(Lim, Tae-Won),김창수(Kim, Chan-Soo) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
Proper water management is important to achieve high performance and durability of Polymer electrolyte fuel cell (PEFC). Among various stack components, gas diffusion layer (GDL) is considered as a core part to determine the gas and water transportation in a cell. To optimize the water management, the changes of properties as well as basic properties of GDLs were investigated before and after clamping of colls. Thickness, electric conductivity, porosity, hydroppobicity etc. were characterized by the same criteria. The amount of residual water after cell operation also was compared by direct measuring of weight. Based on the amount of residual water the endurance on the freeze condition was evaluated.
X선관을 이용한 불투명한 물체 내부 유동의 정량적 가시화 연구
김국배(Guk Bae Kim),임남윤(Nam Yun Lim),류재춘(Jae Chun Ryu),임대현(Dae Hyun Yim),이형구(Hyung Koo Lee),이상준(Sang Joon Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
To diagnose circulatory diseases in the viewpoint of hemodynamics, we need to get quantitative hemodynamic information of blood flows related with the vascular diseases with high spatial resolution of tens micrometer and high temporal resolution in the order of millisecond. For investigating in-vivo hemodynamic phenomena, a new diagnosing technique combining medical radiography and PIV method was newly proposed and developed. This angiographic PIV technique consists of a medical X-ray tube, an X-ray CCD camera, a shutter module for double pulses of X-ray, and a synchronizer. The feasibility of the angiographic PIV technique was tested and quantitative flow velocity field distribution of a flow inside an opaque conduit was acquired by the developed system. It can be used for measuring flow phenomena of nontransparent fluids inside opaque conduits.