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작동 압력과 연료 공급 유량 변화가 고분자 전해질 연료전지 성능에 미치는 영향
편원형(Won-Hyeng Pyen),이상훈(Sang-Hoon Lee),이동호(Dong-Ho Rhee),조형희(Hyung Hee Cho) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Operating pressure and mass flow rate of H₂/air are the dominant parameters affecting the performance of PEMFC. To investigate effects of operating pressure and mass flow rate of reactants on the performance of fuel cell, the performance measurements were executed for a unit cell of PEMFC. The active area is 100 ㎠ and each separator made of graphite has a serpentine flow path. The operating pressure ranges from atmospheric pressure to 2 kgf/㎠, while mass flow rate of reactants from 0.3 and 3.5 times ideal value. As a result of this study, the operating pressure of 1 kgf/㎠ has 27% higher performance of PEMFC than atmospheric pressure case. However, the performance for the operating pressure of 2kgf/㎠ is almost similar to that of 1 kgf/㎠. The performance is improved by increasing mass flow rate of air, while increasing mass flow rate of H₂ hardly affects the performance of fuel cell.
PEMFC 운전시 공기극 분리판의 온도변화에 관한 연구
이상훈(Sang Hoon Lee),편원형(Won Hyeng Pyen),이동호(Dong Ho Rhee),조형희(Hyung Hee Cho) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Water management is one of the most important issues which limits the operation of PEMFC. Specially the flooding effect which the liquified water blocks fuel channels on the bipolar plate is a critical obstacle for enhancement of its performance in the high current section. Due to obstruction of fuel feeding by flooding effect, chemical reactions on MEA(Membrane Electrode Assembly) are limited and thus the temperature for flooding areas decrease. This paper measures the temperature of the cathode bipolar plate for various conditions by the IR(infra-red) camera for detection of flooding areas in high current density section of PEMFC. For analyzing photographs of IR camera, intense chemical reaction areas and flooding areas are detected.
이상훈(Sanghoon Lee),편원형(Won Hyeng Pyen),이동호(Dong-ho Rhee),조형희(Hyung Hee Cho) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Under a high current density condition, performance of PEMFC is restrained by the liquefied H₂O on the flow paths in its separators. That is called the flooding phenomena. Therefore, in order to enhance the maximum power and prolong the normal operating conditions, the flooding phenomena should be reduced and managed properly. Focused on management of liquefied water on the flow paths in the cathode separator of PEMFC, this research deals with the performance enhancement of PEMFC when adopting micro channels in the middle of main channels to reduce liquefied H₂O by its capillary force. As a result of the research, this paper shows not only increase of PEMFC's maximum power but also extension of its normal operating condition in different main channel types such as a parallel flow path and a serpentine flow path individually.