Application of the relative summary climatic indices during work in heat for ergonomic purposes.

A new method was elaborated for the evaluation of work-heat load. Two indices of heat stress were introduced, the so-called 'climatic heat'--Hcl (a sum of convective, radiation, respiration and maximum evaporation heat), and the 'total heat'--Htot (a sum of metabolic and climatic heat). It is an adapted thermal balance equation in which the evaporation heat was replaced with maximum evaporation heat.