Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78W/m °C) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m °C). Determine the steady rate of heat transfer through This double-pane window and the temperature of its inner surface for a day during which the room is maintained at 24°C while the temperature of the outdoors is - 5°C. Take the convection heat transfer coefficients on the inner and outer surfaces of the window to be h1 = 10 W/m2 °C and h2 = 25 W/m2 °C, and disregard any heat transfer by radiation. (Answers: 114 W, 19.2°C)
