Comparison the heat load as the results of tests on human subject in a hot environment with the results obtained from numerical simulation

Comparison of the results of tests carried out in a climatic chamber with volunteers at ambient conditions: ta = 42 °C; RH = 80%; the vapor pressure = 6.56 kPa, V = 0.5 m/s; with predictions from numerical simulation made by the PHS program, they showed their satisfactory compatibility. This confirms the possibility of using the PHS program to predict the heat load of a human being in an extreme hot environment, when the vapor pressure in the surrounding environment exceeds 4.5 kPa, indicated in PN-EN ISO 7933:2005 as a limit value.