Abstract: The simulation on the temperature distribution of human body surface is very important to the evaluation of mobile air conditioner comfort. In order to simplify the boundary conditions for human body simulation for analyzing the thermal comfort of passenger compartment, the human body is regarded as an internal homogeneous heat source. Based on the physiological heat transfer equation of human body, a numerical simulation on the surface temperature distribution of human body in car and thermal environment of passenger compartment is conducted. By using RNG kε turbulence model and SIMPLE algorithm, with consideration of the effects of solar radiation and the radiation between human body and the environment on the temperature and airflow velocity distributions of human body and passenger compartment, the influences of second and third category boundary conditions on the simulation on the temperature distribution of human body are analyzed. In addition, UDF is compiled to simulate the distributions of temperature, airflow velocity, PMV/PPD and draft sensation of human body and compartment. The results show that the simulation results of body surface temperature distribution agree well with the test results in literature, in which the simulation results with third category boundary conditions are closer to the test results than that with second category boundary conditions. With the second category boundary conditions, the correctness of the simulation results mainly depends on the selection of heat flux density, while with the third category boundary conditions, simulation is more convenient, and the airflow velocity, human body temperature, PMV/PPD and draft sensation in passenger compartment are well distributed.

Key words: human body temperature distribution, boundary conditions, numerical simulation, passenger compartment