Research On Thermal Comfort Of The Passenger Compartment Based On Human Thermal Model

With the development of technology and economy, the per capita vehicle ownership continues to rise. The vehicle becomes an indispensable part of people's daily life and the requirements for the vehicle thermal comfort are also rising. At present, only the solar radiation, air supply parameters and other factors are taken into consideration on the research of the numerical simulation of the passenger compartment. The human thermal model is rarely used and the boundary conditions of human are mostly defined as constant temperature and constant heat flux. The impact of the thermal resistance of clothes and the self regulation of human such as the perspiration and the evaporation are mostly ignored. In this dissertation, the human thermal model is used to evaluate human thermal comfort and the environment of the passenger compartment. According to the basic principle of human thermal model, the heat exchange of human body with the environment can be adjusted automatically.In this dissertation, the three-dimensional model of the vehicle passenger compartment is established and meshed in the proportion of 1:1 firstly.Secondly,the solar radiation parameters and the wall boundary conditions of the passenger compartment are defined according to the heat transfer characteristics of different parts of the vehicle and the basic principle of computational fluid dynamics. The air temperature and air velocity are considered as the factors of human thermal comfort. Fifteen combination schemes are designed based on the principle of orthogonal experiment. The temperature and velocity field distribution under different air parameters can be obtained by the numerical simulation of the passenger compartment.Finally, the human body is divided into different segments depending on the differences of thermal physical parameters and heat transfer characteristics of the segments. The adult male in the 50 th percentile is selected and the results of the computational fluid dynamics numerical simulation are imported into Rad Therm. The temperature of each human body segment under different air parameters can be obtained by using human thermal model. The equivalent temperature qTe is chosen as the evaluation index to evaluate human thermal comfort. The influence of air temperature and air velocity on human thermal comfort can be obtained through the analysis.This study shows that when the air conditioning outlet temperature ranges from 6? to 10? and the outlet velocity ranges from 1.65m/s to 2.52m/s, the passenger compartment can meet the requirements of human thermal comfort. Compared with the method of the constant temperature and the constant heat flux, human thermal comfort can be evaluated more scientifically by using human thermal model.