Thermal Blanket
Posted on Monday, June 8th, 2009 at 6:12 pm
Question about energy required to keep warm in cold weather?
A human produces energy at a rate of about 100 Watts. In order to remain warm in cold weather, you must not lose heat any faster than this. How thick must a wool blanket (thermal conductivity: 0.04W/m/◦C), be to keep you warm in 0◦ C weather?
Thanks!
P = kA((Th – Tc)/L
L = kA((Th – Tc)/P
L = 0.04(1.5)(37 – 0)/100
L = 0.022 m (2.2 cm)
I made a couple of assumptions…that the average human skin surface is about 1.5 m*2 and body temp is about 37 C…
Hope that helps…
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