A. Consider a double-paned window which consists of twopanes of glass separated

Question

A. Consider a double-paned window which consists of twopanes of glass separated by a column of air. Each pane hasthickness L and thermal conductivity k1. The airbetween the panes has a thickness d and thermal conductivityk2. Each window pane has an area A. Find anexpression for the rate of heat flow (Q/t) through the window ifthe temperatures on either side of the window are T1 andT2.  

B. Find an expression for the rate of heat flow through asingle-paned window with the same dimensions as the double-panedwindow and the same temperature difference on either side of thewindow.

C. Compare the rates of heat flow for single- anddouble-paned windows if they have the following dimensions: L =.5cm, d = .25cm, A = 1m2, T1 = 0°C,T2 = 20°C, k1 = .84 W/(m·K),and   k2 = .0234W/(m·K).  

Explanation / Answer

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