A Development of Multi-Cell Simulation Model of PEM Fuel Cells Considering Temperature and Two-Phase Effects *Jinwon Yun 1) , Jaeyoung Han 1) and Sangseok Yu 2) 1) Graduate school, Chungnam National University, Yuseong Gu, Daejon, Korea 2) Chungnam National University, Yuseong Gu, Daejon, Korea Corresponding author: sangseok@cnu.ac.kr ABSTRACT A typical control oriented simulation model of a proton exchange membrane fuel cell is a simple extension of unit fuel cell without transport of any physical phenomena. Since the single cell based dynamic model can be used for the design of control logic, intrinsic limitation of single cell based model narrows the degree of freedom in the study of control logic. In this study, a simulation model is developed that simulates cell-to-cell variation of physical phenomena. The model shows temperature variation from cell to cell as well as flooding due to high current operation. The unit cell model includes dynamic response of fuel cell temperature and the flooding inside the cell with multiphase flow model. The simulation parameters of the model are the operating temperatures, various oxygen and vapor concentrations in the gas diffusion media, and liquid water saturation inside the cell. The simulation model is then applied to investigate the cell-to-cell variation of fuel cell stack over various cooling conditions. 1. INTRODUCTION The worldwide increase in air pollution and power demand brought about an efficient and clean generation of electrical energy. The characteristics of low emissions and very high conversion efficiencies make fuel cells be excellent candidate for the primary power source in the future. A fuel cell is a device that can directly convert chemical energy to electric and thermal energy. Among different kinds of fuel cells, the proton exchange membrane fuel cell (PEMFC) is very feasible for vehicle and small CHP system. the advantage of a low-operational temperature (20-100℃), high power density and light weight. PEMFC has gained a lot of attention and is considered as the most promising fuel cell 1) Graduate Student 1) Graduate Student 2) Professor 692