Interrelationship of thermophysical parameters in the design of clothing with active thermal protection

Abstract

Analysis of the experience of designing heat-protective workwear to predict the parametric features of protective clothing elements. Determination of the protective action time of sets of heatprotective clothing with active thermal protection when using cooling elements, as well as optimization of the power ratios of the cooling system depending on the mass and thickness of thermal insulation layers at ultra-high thermal effects of the environment. Methodology of researching is built on a systematic approach, utilizing general scientific methods of analysis and synthesis, as well as generalization and comparison. The research methodology includes a theoretical justification for the choice of materials, based on the fundamental principles of heat and
mass transfer theory. Research has proven that passive thermal protection in sets of overalls does not provide complete protection for workers in high-temperature environments; therefore, it requires the use of systems with active thermal protection. An equation describing the dependence of the thermal protection system's operation on clothing with an autonomous life support system was obtained to determine the time required for protective action when a person works in an ultra-high temperature environment. The assumption regarding the implementation of the principle of combining passive and active methods of protection when creating effective means of individual protection against the effects of extreme temperatures was scientifically substantiated. The problem of temperature distribution in a package of materials in heat-protective overalls with active thermal protection was solved based on the theory of heat and mass transfer, utilizing accepted hypotheses, boundary conditions, and assumptions. The need to create rational composite packages of layers of materials for designing various effective emergency protective clothing, the composition of which requires the use of existing and the development of new innovative materials, is emphasized. Materials from new chemical fibers and their combinations are analyzed, enabling the diversity of use of various heat-protective special clothing, taking into account environmental conditions. It has been proven that the principle of multilayer clothing requires the classification of materials for its manufacture, as well as the study of their heat-protective characteristics, to form segmental composite packages further and predict the time of protective action. The use of a nanostructured, innovative textile material incorporating silver nanoparticles as a linen layer in the design of heat-protective special clothing is proposed.