A thermal window consists of two panes of glass separated by an air gap. Each pane of glass is 3.00 mm thick, and the air gap is 1.00 cm thick. Window glass has a thermal conductivity of 1.00 W/(m K), and air has a thermal conductivity of 0.0260 W/(m K). Suppose a thermal window separates a room at temperature 20.00°C from the outside at 0.00 °C.
a) What is the temperature at each of the four air-glass interfaces?
b) At what rate is heat lost from the room, per square meter of window?
c) Suppose the window had no air gap but consisted of a single layer of glass 6.00 mm thick. What would the rate of heat loss per square meter be then, under the same temperature conditions?
d) Heat conduction through the thermal window could be reduced essentially to zero by evacuating the space between the glass panes. Why is this not done?
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