Clothing made of several thin layers of fabric with trapped air in between, often called ski clothing, is commonly used in cold climates because it is light, fashionable, and a very effective thermal insulator. So it is no surprise that such clothing has largely replaced thick and heavy old-fashioned coats. Consider a jacket made of five layers of 0.1-mm-thick synthetic fabric (k = 0.13 W/m·K) with 1.5-mm-thick air space (k = 0.026 W/m·K) between the layers. Assuming the inner surface temperature of the jacket to be 28°C and the surface area to be 1.25 m2, determine the rate of heat loss through the jacket when the temperature of the outdoors is 0°C and the heat transfer coefficient at the outer surface is 25 W/m2·K. What would your response be if the jacket is made of a single layer of 0.5-mm-thick synthetic fabric? What should be the thickness of a wool fabric (k = 0.035 W/m·K) if the person is to achieve the same level of thermal comfort wearing a thick wool coat instead of a five-layer ski jacket?
Clothing made of several thin layers of fabric with
trapped air in between, often called ski clothing, is commonly
used in cold climates because it is light, fashionable,
and a very effective thermal insulator. So it is no surprise that
such clothing has largely replaced thick and heavy old-fashioned
coats.
Consider a jacket made of five layers of 0.1-mm-thick
synthetic fabric (k = 0.13 W/m·K) with 1.5-mm-thick air
space (k = 0.026 W/m·K) between the layers. Assuming the
inner surface temperature of the jacket to be 28°C and the
surface area to be 1.25 m2, determine the rate of heat loss
through the jacket when the temperature of the outdoors is
0°C and the heat transfer coefficient at the outer surface is
25 W/m2·K.
What would your response be if the jacket is made of a
single layer of 0.5-mm-thick synthetic fabric? What should be
the thickness of a wool fabric (k = 0.035 W/m·K) if the person
is to achieve the same level of thermal comfort wearing a thick
wool coat instead of a five-layer ski jacket?
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