Human Micro-climate Heat And Moisture Transfer Numerical Simulation And The Dress Of Human Thermal Comfort Model To Establish

The dynamic heat and moisture comfort properties of garments are studied systematically in this thesis, and two models, one describing the dynamical heat and water vapor transmission and the other related to the thermal comfort of clothed body, are developed. The main contents are as follows.1. According to the laws of human body physiology and heat and moisture transmission in fabric, the mechanisms of heat-moisture transmission between clothed body and environment were studied and the calculating formula reflecting the heat and moisture transfer process between the clothed body and environment was presented. Those variations in this equation were discussed. This equation indicate that when human stays in a special environment, his thermal feeling is affected by the statement of human body, clothing and the environment.2. On the basis of the idea of the continuum media and approach, the law of energy and mass conversion and the Stefen diffusion theory, a mathematical model had been developed to describe the dynamic heat-moisture transfer in the clothing microclimate under transient wear conditions. If the physical activity and ambient conditions are specified, the model can predict the thermoregulatory response of the body. This model was discreted with the method of the implicit finite difference of fixed step length, and the program, with which the process of heat and moisture transfer through clothing was simulated, had been designed.3. To confirm this model, a experimental apparatus was set up, which was used to test the water vapor permeability of fabric. This apparatus could deal with data by computer system. Experimental measurements with garments made from fibers with different levels of hygroscopicity were compared with predictions by the model. There was good agreement between prediction and experiment for the temperature and the relative humidity of the clothing microclimate.4. Clothing-comfort assessment by human perception analysis provided a sound basis for comparison of apparel garments under combined microclimates and human-activity levels of normal wear. A series of polyester, cotton, rayon, and polyester/cotton blend fabrics were evaluated and tested respectively in subjective wearer trials and in laboratory. With the method of the main component analysis and the regression analysis, The experimental data were dealt with, and the modelreflecting the thermal comfort feeling model was developed according to those experimental data. The stability, reliability and precision of the thermal comfort model were examined too.