A double-pane glass window shown in Figure P13-9, consists of two 4-mm thick layers of glass with k = 0.80 W/m-oC separated by a 10 mm thick stagnant air space with k = 0.025 W/m-oC. Determine
(a) The temperature at both surfaces of the inside layer of glass and the temperature at the outside surfaces of glass, and
(b) The steady rate of heat transfer in Watts through the double pane. Assume the inside room temperature Ti( = 20 oC with hi = 10 W/m2 -oC and the outside temperature T0( = -10 oC with h0 = 30 W/m2 -oC. Assume one-dimensional heat flow through the glass.
Figure P13-9

Glass Glass Air 20C T2 Outside Inside TA T3 -10C 4 mm 10 mm 4 mm