Consider a 0.8 m high, 1.5 m wide glass window, 8 mm thick, k = 0.78 W/m·°C. Room 20 °C, outdoors −10 °C; h_{1} = 10, h_{2} = 40 W/m^{2}·°C (including radiation). Determine (a) the heat transfer rate (answer in W) and (b) the inner surface temperature (answer in °C, with sign).