Abstract
Studies presented in this paper concern wide issue of thermal comfort of protective clothing. The Computer Aided Design (CAD) software tools to analyze thermal insulation of multilayer textile assembly used in thermal protective clothing were applied. First, 3D geometry and morphology of a real textile assembly was modeled. In the designed model different scales of resolution were used for individual layers, ranging from a homogenized nonwoven fabrics model to mapping the geometry of yarns in woven fabrics model. Next, the finite volume method to estimate thermal insulation properties of this assembly, when exposed to heat radiation, was used. Finally, the simulation results were verified experimentally using method described in EN ISO 6942. On the basis of both simulation and experimental results obtained for the multilayer textile assembly, protective clothing parameters directly affecting the ability to protect against heat, were determined. Correlating simulated and experimental values of these parameters were obtained, which may indicate that applied software can be an effective tool in analyzing thermal properties of newly designed multilayer functional clothing.
Highlights
The thermal comfort of the clothing user is closely related to the thermal balance between the human body and its environment
Radiant Heat Transfer Index (RHTI) - time to achieve a temperature rise of 24 °C in calorimeter when testing the sample with a specified incident heat flux density
The objective of the study was to investigate the thermal performance of multilayer textile assembly used in protective clothing exposed to heat radiation
Summary
The thermal comfort of the clothing user is closely related to the thermal balance between the human body and its environment. Numerical simulations [18,19,20] are an effective and widely used tool to analyze among others thermal processes occurring in clothing, phenomena in porous materials [21, 22] as well as filtration processes occurring in fibrous materials [23,24,25] These tools use models of real clothing and numerical analysis of physical phenomena to predict their protective properties. In the current work selected CAD software and finite volume methods to analyze heat transfer in protective clothing in order to predict its protection performance was applied. In this work the software to analyze heat transfer in transient state through multilayer textile assembly used in thermal protective clothing exposed to radiant heat was used. The usefulness of the developed model by comparison with experimental results was verified
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