A refrigerator having inside dimension of 0.5 m x 0.5 m and 1.0 m height is maintained at 6°C. The walls of the refrigerator are constructed from two mild steel sheets 3 mm thick (k = 46.5 W/m°C) with...

A refrigerator having inside dimension of 0.5 m x 0.5 m and 1.0 m height is maintained at 6°C. The walls of the refrigerator are constructed from two mild steel sheets 3 mm thick (k = 46.5 W/m°C) with 50 mm glass wool insulation (k = 0.460 W/ m°C) between them. The average heat transfer coefficient at the inner and outer surface are 11.6 and 14.5 W/m2°C respectively. The surroundings' temperature is 25°C. Find the rate at which heat must be removed from the interior, and the temperature at outer surface of the refrigerator.