Hot water at an average temperature of 70°C is flowing through a 15-m section of a cast iron pipe (k- 52 W/m K) whose inner and outer diameters are 4

cm and 4.6 cm, respectively, The outer surface of the pipe is exposed to the cold air at 10°C in the basement, with a heat transfer coefficient of 15 W/m2-K. The heat transfer coefficient at the inner surface of the pipe is 120 W/m2-K. Ignoring radiation determine the rate of heat loss from the hot water in W.