New Index Indicating under the Standard Condition on 50% Relative Humidity Based on Wet Bulb Globe Temperature WBGT

Abstract

It is considered to recognize 31 ℃ WBGT dangerous because of its low temperature value compared with air temperature. This is because WBGT is made based on Yaglou’s effective temperature scale, and the temperature is converted based on relative humidity 100%. A new index WBGT50 indicated based on relative humidity 50% was proposed. There are several methods of calculating the index. From a point of intersection of equal WBGT line with relative humidity 50% line on the psychrometric chart WBGT50 was derived. This index is considered to indicate the effect of environment heat stress appropriately.