The space between the panes of a double-glazed window can be filled with either

Question

The space between the panes of a double-glazed window can be filled with either air or carbon dioxide at atmospheric pressure. The window is 1.5m high and the spacing between the panes can be varied. Develop an analysis to predict the convection heat transfer rate across the window as a function of pane spacing and determine, under otherwise identical conditions, whether air or carbon dioxide will yield the smaller rate. Illustrate the results of your analysis for the two surface0temerature conditions: winter(-10 degrees celcius, 20 C) and summer (35 degree C, 25 C).

Explanation / Answer

the air pressure is P = pgh where p = 1 kg/m^3,g = 9.8 m/s^2 and h = 1.5 m

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