Operation-Relevant Modeling of an Experimental Proton Exchange Membrane Fuel Cell
A current-voltage (I-V) curve, also known as a polarization curve, is generally used to express the characteristics of a proton exchange membrane (PEM) fuel cell system. The behavior of a PEM fuel cell is highly nonlinear and its performance is controlled with appropriate water and thermal management. Therefore, it is essential to capture the I-V curve of a cell as the operating condition changes. A first principle one-dimensional water and thermal management model is developed to generate the I-V curve. The model considers the effects of: water transport across the membrane, activation overpotential, ohmic overpotential, concentration overpotential, pressure drops, and current density distribution along the channel of a PEM fuel cell. Design and modeling parameters are obtained via regression from four sets of experimental data. They are further validated by six sets of data as operating conditions change. With the predictive model available, the effects of process variables to the cell performance are investigated. The following dominant process variables are identified: the fuel cell temperature, the cathode pressure, the air feed stoichiometric ratio, and the anode humidification temperature. These dominant process variables should be effectively utilized to accommodate load changes.
proton exchange membrane fuel cell I-V curve modeling optimization
Ai-Jen Hung Lung-Yu Sung Yih-Hang Chen Cheng-Ching Yu
Dept.of Chem.Eng.,Taiwan University,Taipei 106-17,Taiwan Energy & Environmental Lab.,Industrial Technology Research Institute,Hsinchu 310,Taiwan
国际会议
西安
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）