# (Originais Teachy 2023) - Question Hard of Physics

During winter, a family decides to install double-pane windows in their house to help maintain the indoor temperature. The windows are made up of two layers of glass, each 4mm thick, with a 1cm gap of air in between. They know that the thermal conductivity of glass is 0.84 W/(m.K) and that of air is 0.024 W/(m.K). The outer surface of the window is at a temperature of -10°C, while the inner surface is at a comfortable room temperature of 20°C. What is the rate of heat transfer through a window that is 1m by 1m?
a.
The rate of heat transfer through a 1m by 1m double-pane window is approximately 13600.85 W.
b.
The rate of heat transfer through a 1m by 1m double-pane window is approximately 15000.75 W.
c.
The rate of heat transfer through a 1m by 1m double-pane window is approximately 12000.65 W.
d.
The rate of heat transfer through a 1m by 1m double-pane window is approximately 12600.95 W.
e.
The rate of heat transfer through a 1m by 1m double-pane window is approximately 11000.45 W.