Abstract: Based on flow field and temperature field, the effects of different inlet air temperatures on the thermal comfort of passenger compartment are analyzed in this paper. The simulation results well agree with experimental results, showing that under extreme hot conditions, increasing inlet air volume to the vicinity of critical one is conducive to rapid heat dissipation and avoiding excessive blowing sensation. High inlet air temperature will significantly deteriorate the cooling effect of occupants, but the air freshness in the compartment has little change. It is suggested that in designing air conditioning system, sufficient consideration should be given to the flow and cooling of air in the compartment, including the vicinity of passenger's feet, and by adjusting the grille angle of duct to avoid poor cooling due to the appearance of dead speed zone

Key words: passenger compartment, thermal comfort, flow field, temperature fiel