2. Compare the heat loss in W from two windows of a room, one having a single sheet of glass 4 mm thick while the other has two sheets of glass, 2 mm thick each, separated by 2 mm of air. The second window is called a thermopane. The window sizes are 1.5 m × 2 m. The air temperature in the room is 23°C and the outside temperature is -10°C. The average value of the thermal conductivity of glass is 0.96 W/m·K and that of air is 0.0257 W/m·K over this temperature range of interest. The heat transfer coefficient corresponding to slower moving air inside the room is 5 W/m2·K and that of the faster moving air outside is 25 W/m2·K. Consider the thin layer of air between the glass sheets to be stagnant.