Consider two identical people each generating 60W of metabolic heat steadily while doing sedentary work anddissipating it by convection and perspiration. The first personis wearing clothes made of 1-mm-thick leather (k =0.159 W/m·K) that covers half of the body while the secondone is wearing clothes made of 1-mm-thick synthetic fabric(k = 0.13 W/m·K) that covers the body completely. Theambient air is at 30°C, the heat transfer coefficient at theouter surface is 15 W/m2·K, and the inner surface temperatureof the clothes can be taken to be 32°C. Treating the bodyof each person as a 25-cm-diameter, 1.7-m-long cylinder,determine the fractions of heat lost from each person by perspiration.
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 covers half 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/m2·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 lost from each person by perspiration.
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