A large window measures 1.7 m by 2.9 m. At what rate will heat be conducted through the window when the room temperature is 26 C and the outside temperature is -2 C if the window instead has a double pane of glass (a "thermopane"), in which each pane is 2.2mm thick, with an intervening air space of 1.5 mm? (Assume that there is a constant temperature difference and consider conduction only.)