The outside wall of a refrigerated storage room is 10m long and 3 m high and is constructed with 100mm concrete block (k 0.935 W/[m °C]) and 10 cm of fi ber insulation board (k 0.048W/[m °C]). The inside of the room is at 10°C and the convective heat-transfer coeffi cient is 40 W/(m 2 K); the outside temperature is 30°C with a convective heattransfer coeffi cient of 10 W/(m 2 K) on the outside w