A double pan window used for insulating a room thermally from outside consists of two glass sheets each of area 1 `m^(2)` and thickness `0.01m` separated by `0.05` m thick stagnant air space. In the steady state, the room-glass interface and the glass-outdoor interface are at constant temperatures of `27^(@)C` and `0^(@)C` respectively. The thermal conductivity of glass is `0.8 Wm^(-1)K^(-1)` and of air `0.08 Wm^(-1)K^(-1)`. Answer the following questions.
(a) Calculate the temperature of the inner glass-air interface.
(b) Calculate the temperature of the outer glass-air interface.
(c) Calculate the rate of flow of heat through the window pane.

Answer

(a) `26.5^(@)C` (b) `0.5^(@)` (c) `40.5^(@)C`