Question: Repeat Problem 1320, assuming a fouling factor Rf, i = 0.0005 m2 ( (C/W on the inner surface of the tube. Water at an average

Repeat Problem 13–20, assuming a fouling factor Rf, i = 0.0005 m2 ( (C/W on the inner surface of the tube.
Water at an average temperature of 107(C and an average velocity of 3.5 m/s flows through a 5-m-long stainless steel tube (k = 14.2 W/m ( (C) in a boiler. The inner and outer diameters of the tube are Di = 1.0 cm and Do = 1.4 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho = 8400 W/m2 ( (C, determine the overall heat transfer coefficient Ui of this boiler based on the inner surface area of the tube.

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