Evaluation of Textile Thermal Properties and their Combinations

The paper presents the evaluation of textile material thermal properties and their combinations as used for business clothing systems, which was conducted through two separate studies. In the first study, an investigation of textile thermal properties was carried out using different measurement systems enabling the measuring of heat and/or moisture trans mission through textile materials by using the hot-plate apparatus, the Thermo Labo II and the Permetest measurement systems. This part of the research investigated the correlations be tween the measured parameters of the textile thermal properties evaluated by using different measurement systems, and correlations be tween thickness and thermal properties. In the second study, the thermal properties of material combinations were evaluated by using a thermal sweating cylinder enabling the evaluation of heat and moisture transmission through textile materials or material combinations. The influences of different environmental conditions and sweating levels on the thermal properties of material combinations were investigated for this purpose. The results show that statistically significant correlations exist between the parameters of textile thermal resistances evaluated with different measurement systems using the hot - plate apparatus, the Thermo Labo II and the Permetest measurement systems. It is also evident from the results that by increasing textile thicknesses, the values of textile thermal resistances and water vapour resistance increase proportionally. The results of evaluating thermal properties of material combinations under different environmental and sweating conditions showed that different climate conditions and sweating levels influence the heat and moisture transmission properties of material combinations. The results show that dry and evaporative heat loss and water vapour transmission depend on climatic conditions or temperature gradient, respectively, between the cylinder surface and ambient temperature, and that different sweating levels influence the evaporative heat loss, corrected thermal resistance and water vapour transmission values.