A Thermopane window of area 3.1 m2 is constructed of two layers of glass, each 3.9 mm thick separated by an air space of 2 mm. If the inside is at 17◦C and the outside is at −24◦C, what is the heat loss through the window? The thermal conductivity of glass is 0.8 W/m · ◦ C and of air is 0.0234 W/m · ◦ C . Answer in units of kW.