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하나로(HANARO) NRF 와 중성자 영상법을 이용한 PEM fuel cells 내의 물 배출 특성에 관한 연구
김태주(TaeJoo Kim),김종록(JongRok Kim),심철무(CheulMuu Sim),김무환(MooHwan Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An investigation into the water discharge characteristics of PEM fuel cells is carried out by using a feasibility test apparatus and the Neutron Radiography Facility (NRF) at HANARO. The feasibility test apparatus was composed of a distilled water supply line, a compressed air supply line, heating systems and single PEM fuel cells which was a 1-parallel serpentine type with a 100 ㎠ active area. Three kinds of methods were used; compressed air supply only, heating only, and a combination of the methods of a compressed air supply and heating, respectively. The resultant water discharge characteristics are different according to the applied methods. The compressed air supply only is suitable for removing the water at a flow field and a heating only is suitable for water at the MEA. Therefore in order to remove all the water at PEM fuel cells, the combination method is needed at the moment.
중성자 영상법을 이용한 PEMFC에서 유동 방향과 차압에 따른 성능 및 물 분포에 관한 실험적 연구
김태주(TaeJoo Kim),김종록(Jongrok Kim),심철무(CheulMuu Sim),김무환(MooHwan Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this investigation, we prepared a 3-parallel serpentine single PEMFC which has the active area of 25㎠ and the flow channel cross section of 1×1㎜. Distribution and transport of water in an operating PEMFC were observed by varying the flow directions (co-current and counter-current) in each channel and the differential pressures (100, 200, 300 ㎪) applied between the anode and cathode channels. This investigation was performed at the neutron imaging facility at the NIST. It has been observed that the differential pressure affects the performance of PEMFC while the flow direction affects spatial distribution of water when the neutron images were analyzed for several different operating conditions. More specifically, the amount of water production in the fuel cell increased as the partial pressure increases at a given current density and the water production was more uniform for the counter current than the co-current case. It is shown that the neutron imaging technique is a powerful tool to visualize the PEMFC.
중성자 영상법을 이용한 PEMFC 에서의 물 배출 특성에 관한 실험적 연구
김태주(TaeJoo Kim),김종록(JongRok Kim),김무환(MooHwan Kim),심철무(CheulMuu Sim),이승욱(SeungWoo Lee),전진수(JinSoo Jeon) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The neutron imaging technique was used to investigate the water discharge characteristics at PEMFC. The feasibility test apparatus was consisted of pressurized air and water in order to simulate the actual operating PEMFC. The feasibility tests have been performed at two kinds of flow field type (1-parallel and 3-parallel) with 100 ㎠ active area and different flow rate (200, 400, and 850 ㏄/min). Although the water and pressurized air was supplied only into cathode, the water movement into anode was found by neutron image. The water at cathode is well discharged, but except the 850 ㏄/min at 3-parallel flow field type, the water at the anode was not removed by pressurized air. The total water volume variations at each condition were calculated from the neutron images. This technique can be used for detailed studies on water distribution and transport in the PEMFC.
중성자 영상법을 이용한 PEM Fuel Cell 내의 물 유동 및 분포 가시화
김태주(TaeJoo Kim),정용미(YongMi Jung),김무환(MooHwan Kim),M. Arif,심철무(CheulMuu Sim),이승욱(SeungWoo Lee),전진수(JinSu Jeon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
The neutron imaging technique was used to visualize the water movement and distribution at the actual operating PEM Fuel Cells. At this study, we changed the inlet humidity conditions (50 and 100 %) and output power to check the effect of water movement and distribution at the PEM Fuel Cell.
중성자속 및 선형 흡수 계수 보정을 고려한 중성자영상법을 이용한 PEMFC 내의 물 배출 특성에 관한 실험적 연구
김태주(TaeJoo Kim),김종록(JongRok Kim),김무환(MooHwan Kim),심철무(CheulMuu Sim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The neutron imaging technique was used to investigate the water discharge characteristics at PEMFC. Prior to investigation of water discharge characteristics, the linear attenuation coefficient for water at Neutron Radiography Facility (NRF) was calibrated. The feasibility test apparatus was consisted of pressurized air and water in order to simulate the actual operating PEMFC. The feasibility tests have been performed at 1-parallel serpentine type with 100 ㎠ active area and different air flow rate (1, 2, and 4 lpm). The total water volume variations at each condition were calculated from the neutron images. The water at channel is well discharged as soon as supplying the pressurized air into the PEMFC. However, because the water at MEA isn’t removed the total water volume is constant after 150. Therefore more effective method is needed in order to discharge water at MEA, and the neutron imaging technique is helpful for it.
중성자 방사선 촬영법을 이용한 PEMFC 내의 2 상 유동 가시화 예비 실험
김태주(TaeJoo Kim),정용미(YongMi Jung),김무환(MooHwan Kim),M.Arif(M. Arif),심철무(CheulMuu Sim),이승욱(SeungWoo Lee),전진수(JinSu Jeon) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
The feasibility test was performed to check the possibility of 2-phase flow visualization and water distribution at inside the PEMFC using neutron radiography image technique. It was composed using water and pressured air. From the image, several 2-phase flow patterns were discovered and water fraction was estimated by the reference specimen and image analysis.