Conduction of Heat
The inner and outer glass of a double-pane window are separated by a 1cm
thick layer of still air. Determine the amount of heat per unit time
and square-meter of surface which is flowing under steady-state conditions
through the window. The glass panes have a thickness of 0.5 cm each
and the temperatures on the outer surfaces of the two
glass panes are at 20°C and 0°C, respectively.
The coefficients of thermal conductivity are k=1.4 W/(m K) for glass
and k=0.026 W/(m K) for still air. Neglect heat transfer by radiation. What is
the temperature drop across the glass panes and across the air gap ?
Would increasing the thickness of the glass panes by a factor of 2 make
a significant difference ?