Consider two identical people each generating 60 W of metabolic heat steadily while doing sedentary work, and dissipating it by convection and perspiration. The first person is wearing clothes made of 1-mm-thick leather (k = 0.159 W/m·K) that coverfhalf of the body while the second one is wearing clothes made of 1-mm-thick synthetic fabric (k = 0.13 W/m·K) that covers the body completely. The ambient air is at 30°C, the heat transfer coefficient at the outer surface is 15 W/m·K, and the inner surface temperature of the clothes can be taken to be 32°C. Treating the body of each person as a 25-cm-diameter, 1.7-m·long cylinder, determine the fractions of heat iost from each person by perspiration.
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