A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open

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A 50-m-long section of a steam pipe whose outer diameter is 10 cm passes through an open space at 15°C. The average temperature of the outer surface of the pipe is measured to be 150°C. If the combined heat transfer coefficient on the outer surface of the pipe is 20 W/m2·K, determine

(a) The rate of heat loss from the steam pipe;

(b) The annual cost of this energy lost if steam is generated in a natural gas furnace that has an efficiency of 75 percent and the price of natural gas is $0.52/therm (1 therm = 105,500 kJ);

(c) The thickness of fiberglass insulation (k = 0.035 W/m·K) needed in order to save 90 percent of the heat lost. Assume the pipe temperature to remain constant at 150°C.

T- 15°C 150°C Steam 50 m Fiberglass insulation

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Related Book For  answer-question

Fundamentals of Thermal-Fluid Sciences

ISBN: 978-0078027680

5th edition

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

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