Repeat Prob. 8118 for a pipe made of copper (k = 386 W/mK) instead of cast iron. Problem. 8118 Hot water at 90C enters a 15-m section of a cast iron pipe (k = 52 W/mK) whose inner and outer diameters are 4 and 4.6 cm respectively at an average velocity of 1.2 m/s. The outer surface of the pipe whose emissivity is 0.7 is exposed to the cold air at 10C in a basement with a convection heat transfer coefficient of l2 W/m2K. Taking the walls of the basement to be at 10C also determine (a) the rate of heat loss from the water and (b) the temperature at which the water leaves the basement.
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