Question
(a) Calculate the rate of heat conduction through a double-paned window that has a $1.50\textrm{ m}^2$ area and is made of two panes of 0.800-cm-thick glass separated by a 1.00-cm air gap. The inside surface temperature is $15.0^\circ\textrm{C}$ , while that on the outside is $-10.0^\circ\textrm{C}$. (Hint: There are identical temperature drops across the two glass panes. First find these and then the temperature drop across the air gap. This problem ignores the increased heat transfer in the air gap due to convection.) (b) Calculate the rate of heat conduction through a 1.60-cm- thick window of the same area and with the same temperatures. Compare your answer with that for part (a).
1. $83\textrm{ W}$
2. $2.0\times 10^{3}\textrm{ W}$. The single pane window loses heat at a rate that is 24 times that of the double pane window. The difference in the real world would be less considering convection, but would still be significant.

Note: At 5:30 in the video Shaun should have said $d_a$, but mistakenly said $d_2$.

# OpenStax College Physics, Chapter 14, Problem 42 (Problems & Exercises)

In order to watch this solution you need to have a subscription.