Prediction of solar heat load on man.

Abstract
A model is presented for calculating the solar heat load on a man in a given radiant environment. Factors considered include adjustments of surface area for clothing and posture, the absorptance, reflectance and transmittance of the surface material, and the percentage of absorbed solar heat actually reaching the skin. Average maximum calculated values of solar heat loads were 400 kcal/hr. for a nude tanned Caucasian, 500 kcal/hr. for a nude Negroid, 200 kcal/hr. when wearing a military fatigue uniform and 125 kcal/hr. when wearing heavier winter clothing.

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