Consider a 1.5m high and 2.4m wide double-pane window consisting of two 3mm thick layers of glass ( k = 0.78 W/m.K ) separated by a 12mm wide stagnant air space ( k = 0.026 W/m.K ). Determine the steady state 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 21C while the temperature of the outdoor is -5C . Take the convection heat transfer coefficients on the inner and outer surface of the window to be h1 = 10W/m2.K and h2 = 25W/m2.K.