Optimization Design Of Heat Dissipation Key Components For Full-power Fuel Cell Vehicles

Proton exchange membrane fuel cell(PEMFC)has become an ideal power source for new energy vehicles due to its advantages of low operating temperature,high efficiency and zero emission.However,the low working temperature and high power demand resulted in serious thermal management issue of PEMFC vehicle.This paper analyzed the main heat dissipation components in the heat dissipation process of the full-power fuel cell vehicle,studied the two key heat management components-the air intake grille and radiator of the full power FCV,and the optimized structure of the radiator was suggested to improve the heat dissipation performance of thermal management system in PEMFC.The basic process of the full-power fuel cell vehicle thermal management system,the workflow of each component,and the impact on the thermal management system were studied.The inlet and outlet temperatures of the radiator coolant and the air flow rates of the radiator corresponding to different intake grilles were calculated.The flow and heat transfer characteristics of radiator fins with different window open angles were studied in detail.The results showed that the air intake grille layout of Mirai is better than that of Roewe 950,and the optimal window opening angle of radiator was 23 degree.The heat removal characteristic of the radiator in FCV was simulated.Based on the 23 degree fin window angle,four different radiator cores were designed and their heat transfer characteristics were numerically studied.The performance of these four kinds of radiator was compared in terms of Nusselt number,pressure drop,pump power,tube wall heat exchange amount and field synergy.The results showed that the heat transfer performance of the windward bend louver type hybrid structure radiator core was the best,which was12% higher than that of the traditional radiator.