A window is made up of two panes of glass (with surface temperatures of 15 °C and 5 °C) that are separated by a gap of 3 cm. The said window has a height of 2 m and a width of 5 m. Initially, the gap...

Extracted text: A window is made up of two panes of glass (with surface temperatures of 15 °C and 5 °C) that are separated by a gap of 3 cm. The said window has a height of 2 m and a width of 5 m. Initially, the gap is filled with air (flowing via temperature gradient). Then, this air space is partially evacuated such that the pressure is already 0.3 atm. This is done to lessen the heat transfer between the two panes of glass. Both glass surfaces have an emissivity of 0.9. Calculate the rate of heat transfer (W) through the panes.