Problem $4$

A large window glass $L=0\mathrm{.}5cm$ thick with thermal conductivity $k=0\mathrm{.}78\frac{W}{mK}$ is exposed to warm air at $T_i=25C$ over its inner surface, and the heat transfer coefficient for the inside air is $h_i=15\frac{W}{m^2(K)}.$ The outside air is at $T_o=-15C,$ and the heat transfer coefficient associated with the outside surface is $h_o=50\frac{W}{m^2(K)}.$ Please state all your assumptions.

a$)$ Draw the sketch for this problem, and the thermal circuit diagram. Please label all the thermal resistors.

b$)$ What is the temperature of the inner surface of the glass?

c$)$ What is the temperature of the outer surface of the glass?