Sweat cooling in impermeable clothing
bookPart
In a laboratory experiment with six subjects, effective insulation of a totally impermeable outfit was measured in two essentially different conditions. In the first condition, no condensation of evaporated sweat on the inside of the outer impermeable layer was possible, whereas in the second condition such condensation deliberately did occur. Processes of humid heat transfer caused a 40% decrease in effective insulation. Therefore, at ambient temperatures lower than skin temperature (thus allowing condensation), heat stress is lower than one might expect on the basis of clothing insulation judged by thickness or determined in non-humid situations (non-sweating manikin).
Topics
TNO Identifier
5744
Source title
Aspects Medicaux et Biophysiques des Vetements de Protection; Actes de la Conference Internationale, 4-8 Juillet, Lyon-Bron
Pages
260-267
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