Problem II.10 Steam flows in a hollow cylinder of outer diameter 110 mm and length 30 m. The cylinder is placed in the atmosphere and covered with insulator to reduce heat loss from the surface. The thickness and the thermal conductivity of the insulator are 5 cm and 0.12 W/m K, respectively. The inner and outer surfaces of the insulator are maintained at 100 °C and 30 °C, respectively. Calculate the heat loss from the outer surface of the insulator per unit time (1 s).

Problem II.10 Steam flows in a hollow cylinder of outer diameter 110 mm and length 30 m. The cylinder is placed in the atmosphere and covered with insulator to reduce heat loss from the surface. The thickness and the thermal conductivity of the insulator are 5 cm and 0.12 W/m K, respectively. The inner and outer surfaces of the insulator are maintained at 100 °C and 30 °C, respectively. Calculate the heat loss from the outer surface of the insulator per unit time (1 s).