Computational Analysis and Experimental Investigation of Heat and Moisture Transfer in Multilayer Textile Package

The transfer properties of the moisture and heat through multilayer textile packages have an influence on the wearing comfort of the clothing assemblies produced from such materials. The necessary properties of the textile package are obtained by means of proper selection of the structure of the package and physical properties of each individual textile layer. The research of wearing comfort is focused on analysis of air permeability, thermal resistance and the resistance and absorption of water vapour. In this work a typical assortment of textile materials, which is used in summer and winter military clothing, was selected. During the experimental investigation the thermal and water vapour resistance of the textile packages consisting of different combinations of layers made of different materials have been compared. The finite element computational model has been developed for the analysis of heat transfer through the textile package caused by heat conduction and advection due to ventilation air flow. The model enabled to obtain values and time laws of temperatures in each layer of the package. The validity of the model is ensured by employing the experimentally measured thermal resistance values for each individual layer of the structure. The numerical results have been compared against experimentally measured data of the textile package.