수소전기차용 연료전지 시스템 최적 물 관리 열역학적 접근

Abstract

A systematic, multicomponent model has been developed to investigate optimal water management for fuel cell electric vehicles. Water management strategies focus on manipulating thermodynamic states to provide the adequate requirements of fuel cells. A fuel cell water transfer model, a membrane humidifier model, and a compressor model are mathematically developed and solved using MATLAB to achieve an integrated thermodynamic approach based on system piping and instrumental diagrams. Each component model is validated using published experimental data with good agreement. In the air supply system, the required humidity at the fuel cell channel inlets is theoretically predicted under low heating value operating fuel cells. Subsequently, the optimal conditions of the compressor and the bypass valves are suggested to control the humidification levels of the humidifier. The results show the thermodynamic states within system in accordance with the optimal operation conditions of the component.