METHODOLOGY FOR DETERMINING THE LEVEL OF PROTECTION OF WORKERS IN CONDITIONS OF EXTRAORDINARY TEMPERATURE INFLUENCES

Abstract

The protection of workers in conditions of non-regulatory (extreme) temperatures (low and high) requires the availability of effective protective materials and clothing made from them. To rationalize thermal protection, it is advisable to preevaluate its effectiveness under certain conditions, which can be carried out using calculation methods. For this, the basic equation of thermal conductivity in one-dimensional form is used. With the availability of data on thicknesses, specific heat capacities, densities and coefficients of thermal conductivity of biological tissues (skin, bones), it is possible to calculate the required efficiency and parameters of the material of the protective layer. For this purpose, a method of calculating thermal conductivity coefficients of each of the layers through which heat transfer occurs is provided. An explicit difference scheme was used for the numerical solution of the modeling equation. The obtained dependences provide values of thermal conductivity coefficients at the boundaries of layers with different thermophysical parameters. The number of nodes along the selected axis and grid step are chosen in each specific case, based on the required accuracy of the calculation. Taking into account possible discrepancies in the values of constants and coefficients, as well as the ambiguity of external atmospheric influences, it is necessary to include a certain margin of protection efficiency in the calculations.