Repeat Prob. 19135 for a pipe made of copper (k = 386 W/mK) instead of cast iron.

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Repeat Prob. 19€“135 for a pipe made of copper (k = 386 W/mˆ™K) instead of cast iron.

Hot water at 90°C enters a 15-m section of a cast iron pipe (k = 52 W/mˆ™K) 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 10°C in a basement, with a convection heat transfer coefficient of l2 W/m2ˆ™K. Taking the walls of the basement to be at 10°C also, determine

(a) The rate of heat loss from the water

(b) The temperature at which the water leaves the basement.

Tamblent E = 0.7 = 10°C Hot water 90°C 1.2 m/s -15 m

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Fundamentals of Thermal-Fluid Sciences

ISBN: 978-0078027680

5th edition

Authors: Yunus A. Cengel, Robert H. Turner, John M. Cimbala

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