Consider a 0.8-m-high and 1.5-m-wide double-pane window consisting of two
4-mm-thick layers of glass (k 5 0.78 W/m·K) separated by a 10-mm-wide
stagnant air space (k 5 0.026 W/m·K). Determine the steady rate of heattransfer through this double-pane window and the temperature of its inner surface
for a day during which the room is maintained at 20°C while the temperature
of the outdoors is 210°C. Take the convection heat transfer coefficients
on the inner and outer surfaces of the window to be h1 5 10 W/m2·K and
h2 5 40 W/m2·K, which includes the effects of radiation.