2 14.P037 A cold-weather sleeping bag uses goose down to keep the inside warm. T

Question

2 14.P037 A cold-weather sleeping bag uses goose down to keep the inside warm. The rate at which a sleeping camper generates heat energy is about 71 the air inside the bag and around the camper when the outside temperature of the bag is 0°C. (Assume that the thickness of 3.8 cm.) W. Calculate the temperature of bag has a surface area of about 5.7 m2 and a 19.72 Need Help? s) to make later windows are c with two panes of glass separated by an air gap (see figure below). In a typical window of this type, the air gap makes a huge difference in the rate of heat flow. The heat-flow rate is much smaller for an energy-efficient window than for ap is much less than that of a glass pane. a single pane of glass because the thermal conductivity of the air Air

Explanation / Answer

Given Data

dQ/dt = 71 W

Thickness L = 3.8 cm

A = 5.7 m^2

T = 0 deg C = 273 K

Solution:-

dQ/dt = kA d(theta)/dx

71 = k * 5.7 * (T - 273)/0.038

k =0.024 W/m.degK

71 = 0.024*5.7*(T - 273)/0.038

T = 292.7 K

T = 19.57 deg C

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