Abstract:

In order to provide a more accurate thermal safety prediction for outdoor workers in high temperature weather, PHS model was compared with HSDA model, and the HSDA model was selected for modification. Then the average radiation temperature was selected as the correction object. The error function between the measurement and predicted values was used to derive the correction coefficient and obtain the modified HSDA model. Finally, the modified model was used to predict outdoor workers' safety time and water loss under high temperature weather. The results indicate that the core temperature prediction accuracy of HSDA model is higher than that of the PHS model in the outdoor high temperature environment. The correction factor of the average radiation temperature is determined to be 0.614, and the prediction accuracy of HSDA model can be improved by about 58.5% after modification. With the increase of the environmental parameters, the safety time of outdoor workers gradually decreases and is generally lower than 1 h. The water loss gradually increases and even exceeds 7.5% of the standard body weight (4 462.5 g/h).

Key words: heat strain decision aid(HSDA)model, high temperature weather, outdoor workers, thermal safety, predicted heat strain(PHS)model, solar radiation intensity