Engineering, 25.09.2020 03:01 ushayuri
Wearing layers of clothing in cold weather is often recommended because dead-air spaces between the layers keep the body warm by reducing the heat loss from the body. Compare the rate of heat loss for a single, 13 mm thick layer of wool to three 3 mm thick layers separated by 2 mm air gaps. Since the air gaps are so small, treat the air as stationary (i. e., assume heat is being conducted through the air gaps). Use kwool = 0.07 W/m-K and kair = 0.02 W/m-K.
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