Calculation of cooling phases in warm and hot environments using the PHS-model

The present article summarizes essential results of the research project "Testing of the application of the Predicted- Heat-Strain-(PHS-)model for the design of work-rest-cycles while working in hot environment" which has been executed on behalf of the Federal Institute for Occupational Safety and Health (BAuA). A pragmatic proposal has been tested on the basis of laboratory experiments and model calculations using the PHS-Model according to ISO 7933. The results show, that the pragmatic proposal could be verified either by physiological measurements and also by the PHS-Model. A procedure to calculate required cooling phases is presented. Based on the results, a guideline is presented, which may be used for the design of work-rest-cycles for work in hot environments.