The top layer of your goose down sleeping bag has a thickness of 5.5cm and a sur

Question

The top layer of your goose down sleeping bag has a thickness of 5.5cm                                    and a surface area of 1.0m^2. When the outside temperature is -20?C you lose 26Cal/hr by heat conduction through the bag (which remains at a cozy 35 ? C inside). Assume that you're sleeping on an insulated pad that eliminates heat conduction to the ground beneath you. What is the thermal conductivity of the goose down?

The top layer of your goose down sleeping bag has a thickness of 5.5cm and a surface area of 1.0m^2 . When the outside temperature is -20?C you lose 26Cal/hr by heat conduction through the bag (which remains at a cozy 35 ? C inside). Assume that you're sleeping on an insulated pad that eliminates heat conduction to the ground beneath you. What is the thermal conductivity of the goose down?

Explanation / Answer

heat conducted/unit time=k*A*(Thot-Tcold)/d

putting the values we get,

k=0.026 cal/hr.m.degree celcius

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