A Thermopane window consists of two 6-mm thick glasses separated by a stagnant air space of thickness 6 mm. The thermal conductivity of the glass is kg = 0. 78 W/mK and that of the air can be taken as ka = 0. 025 W/mK. The convection coefficient for the inside and outside air for the window are hi = 10 and ho=60 W/m2K. Determine the rate of heat loss per square meter of the glass surface for a temperature difference of 40 degree C between the inside and outside air. Compare this result with the heat loss if the window had a single pane of glass of thickness L = 6 mm only instead of the Thermopane.