A mountain climber wears a goose down jacket 3.3cm thick with total surface area

Question

A mountain climber wears a goose down jacket 3.3cm thick with total surface area 1.2m^2 . The temperature at the surface of the clothing is -20C and at the skin is 34 C . Part A Determine the rate of heat flow by conduction through the jacket assuming it is dry and the thermal conductivity k is that of down. Express your answer using two significant figures. Q/t=_____W Part B Determine the rate of heat flow by conduction through the jacket assuming the jacket is wet, so k is that of water and the jacket has matted to 0.40 cm thickness. Express your answer using two significant figure. Q/t=_____W

Explanation / Answer

a) dQ/dt = kA(T 1 -T 2 )/l= 0.025*1.2*(34-(-20))/0.033= 49.0J/s b) dQ/dt = 0.56*1.2*(34-(-20))/0.004 = 9072J/s

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