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Thermal managing effects by cooling channels on performance of a PEMFC
손영준(Sohn, Young-Jun),김민진(Kim, Min-Jin),박구곤(Park, Gu-Gon),김경연(Kim, Kyoung-Youn),이원용(Lee, Won-Yong) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Relative humidity, membrane conductivity and water activity are critical parameters of polymer electrolyte membrane fuel cells (PEMFC) for high performance and reliability. These parameters are closely related with temperature. Moreover, the ideal values of these parameters are not always identical along the channels. Therefore, the cooling channel design and its operating condition should be well optimized along the all location of the channels. In the present study, we have performed a numerical investigation on the effects of cooling channels on performance of a PEMFC. Three-dimensional Navier-Stokes equations are solved with the energy equation including heat generated by the electrochemical reactions in the fuel cell. The present numerical model includes the gas diffusion layers (GDL) and serpentine channels for both anode and cathode gas flows, as well as cooling channels. To accurately predict the water transport across the membrane, the distribution of water content in the membrane is calculated by solving a nonlinear differential equation with a nonlinear coefficient, i.e., the water diffusivity which is a function of water content as well as temperature. Main emphasis is placed on the heat transfer between the solid bipolar plate and coolant flow. The present results show that local current density is affected by cooling channels due to the change of the oxygen concentration and the membrane conductivity as well as the water content. It is also found that the relative humidity is influenced by the generated water and the gas temperature and thus it affects the distribution of fuel concentration and the conductivity of the membrane, ultimately fuel cell performance. Unit-cell experiments are also carried out to validate the numerical models. The performance curves between the models and experiments show reasonable results.
공기 호흡형 고분자 전해질 연료전지 제작 및 발전 특성 연구
손영준(SOHN, Young-Jun),박구곤(PARK, Gu-Gon),엄석기(UM, Sukkee),임성대(YIM, Sung-Dae),양태현(Yang, Tae-Hyun),윤영기(YOON, Young-Gi),이원용(LEE, Won-Yong),김창수(KIM, Chang-Soo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Air-breathing polymer electrolyte membrane fuel cells (PEMFC) are highly promising particularly for small-power applications up to tens watts class. A distinctive feature of the air-breathing PEMFC is its simple system configuration in which axial fans operate for dual purposes, supplying both oxidant and coolant in a single manner. In the present study, a nominal SOW air-breathing PEMFC system is developed and investigated to determine the optimal operating strategy through parametric studies (i.e., reactant humidity, and fan-blowing flow rate). The cell voltage distributions are examined as a function of time to evaluate the system performance under various operating conditions.
손영준(Sohn, Young-Jun),임성대(Yim, Sung-Dae),박구곤(Park, Gu-Gon),김경연(Kim, Kyoung-Youn),김민진(Kim, Min-Jin),이원용(Lee, Won-Yong) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
Air-breathing polymer electrolyte membrane fuel cells (PEMFC) are highly promising particularly for small-power applications up to tens watts class. A distinctive feature of the air-breathing PEMFC is its simple system configuration in which axial fans operate for dual purposes, supplying both oxidant and coolant in a single manner. In the present study, a nominal 80W air-breathing PEMFC system is developed and investigated to determine the optimal operating strategy through parametric studies (i.e., reactant humidity, and fanblowing flow rate). The cell voltage distributions are examined as a function of time to evaluate the system performance under various operating conditions.
이동 전원용 공랭식 고분자 연료전지의 제작 및 운전 특성 연구
손영준(Sohn, Young-Jun),박구곤(Park, Gu-Gon),양태현(Yang, Tae-Hyun),윤영기(Yoon, Young-Gi),이원용(Lee, Won-Yong),임성대(Yim, Sung-Dae),김창수(Kim, Chang-Soo) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.1
Optimal design and proper operation are important to get aimed output power of a polymer electrolyte membrane fuel cell (PEMFC) stack. An air cooling fuel cell stack is widely used in sub kW PEMFC systems. The purpose of this study is to analyze operating conditions affecting the performance of the air cooling PEMFC which is designed for portable application. In portable applications, air cooling stack is difficult to maintain well balanced operating conditions. The importart parameters are the relative humidity, the temperature of the stack, the utilization of reactant gas and so on. in this study, a 500W air cooling PEMFC was fabricated and tested to evaluate the design performance and to determine optimal operating conditions. Moreover, basic modeling also is carried out. These results can be used 3s design criteria and optimal operating conditions for portable PEMFCs
작동 조건에 따른 고온 고분자 전해질 연료전지의 성능 변화에 대한 전산해석 연구
김경연,손영준,김민진,양태현,Kim, Kyoung-Youn,Sohn, Young-Jun,Kim, Min-Jin,Yang, Tae-Hyun 한국전기화학회 2010 한국전기화학회지 Vol.13 No.4
2차원 전산 해석 모델을 사용하여 고온 고분자 전해질 연료전지의 전산해석을 수행하였다. 해석 모델은 기존의 실험데이터와의 비교를 통해 검증하였으며, 다양한 작동 조건이 연료전지의 성능에 미치는 영향을 파악하기 위해 일련의 전산해석을 수행하였다. 본 전산해석의 결과를 통해 교환전류밀도, 이온전도도, 공급유량 및 작동압력이 증가할수록 연료전지의 성능이 향상됨을 확인하였다. 또한, 기체 확산층의 기공율이 높을수록 기체의 확산이 향상되어 연료전지의 성능이 향상되었으며, 양극 기체 확산층의 기공율에 의한 효과가 음극에 비해 더 두드러지게 나타났다. A two-dimensional isothermal model has been employed for numerical simulations of a high temperature hydrogen fuel cell with proton exchange membrane. The model is validated with existing experimental data and used for examination on the effects of various operating conditions on the fuel cell performance. The present numerical results show that the cell performance increases with increasing exchange current density, ion conductivity of the membrane, inlet gas flow rate as well as operating pressure. Also, higher porosity of gas diffusion layer (GDL) results in higher cell performance due to enhancement of the diffusion through the GDL, where the cathode GDL porosity more influences on the performance as compared with the anode one.
고분자 전해질 막의 수화 및 열팽창에 따른 응력분포의 해석에 관한 연구
양정환(Junghwan Yang),손영준(Young-Jun Sohn),박구곤(Gu-Gon Park),김민진(Minjin Kim),박정선(Jungsun Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Behavior of membrane has influenced on performance of a polymer electrolyte membrane fuel cell (PEMFC). The stress distribution and deformation of membrane are major factors for performance and mechanical fatigue life of PEMFC. In this paper, numerical modeling of mechanical stresses under the operating hygro-thermal condition of membrane is provided. Contact analysis of gas diffusion layer (GDL) and membrane is performed under various temperature-humidity conditions. Structural model has nonlinear material properties depended on temperature and relative humidity. Several kinds of geometric conditions are applied to the model. The numerical analysis results indicate that the deformation of membrane is strongly related with the assembly conditions of fuel cell.