Consider a vertical, double-pane window for the conditions prescribed in Problem 9.94. That is, vertical panes at

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Consider a vertical, double-pane window for the conditions prescribed in Problem 9.94. That is, vertical panes at temperature of T= 22°C and T= 20°C are separated by atmospheric air, and the critical Rayleigh number for the onset of convection is RaL,c = 2000.
(a) What is the conduction heat flux across the air gap for the optimal spacing Lop between the panes?
(b) If the glass has an emissivity of εg = 0.90, what is the total heat flux across the gap?
(c) What is the total heat flux if a special, lowemissivity coating (ε= 0.10) is applied to one of the panes at its air-glass interface? What is the total heat flux if both panes are coated?

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Fundamentals Of Heat And Mass Transfer

ISBN: 9780470501979

7th Edition

Authors: Theodore L. Bergman, Adrienne S. Lavine, Frank P. Incropera, David P. DeWitt

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