Research on Heat Transfer Characteristics and Pre-cooling of Car Cabin in Parking and Staring Process Based on Simulation Analysis

The cabin temperature increases sharply and can reach 70°C when the vehicle parks in the summer direct sunlight, which has a bad influence on the occupants entering comfort. At first, based on the theory of thermal, static heat transfer model of cabin is established and the rule of the indoor air temperature changing with time is obtained. After that, ventilation cooling model for car blower is set up and the cooling effect of blower under different flow conditions are analyzed according to the control target temperature inside the cabin. Based on the static heat transfer model, solar radiation intensity, the surface heat transfer coefficient and the glass absorption rate´s impacton the temperature inside the car are analyzed. Besides, experiments have been conducted for verifying the static thermal transfer model and the ventilation cooling model. Experimental results show that the theoretical model are in good agreement with the experimental data, and the blower has good cooling effect when its work flow is70L/s, which is instructive to improve vehicle comfort and reduce the fuel consumption of car´s start process.