Fundamentals of Heat and Mass Transfer
Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Chapter 9, Problem 9.99P

Consider the cylindrical. 0.12-m-diamter radiation shield of Example 9.5 that is installed concentric with a 0.10-m-diameter tube carrying steam. The spacing provides an air gap of L = 10 mm .

(a) Calculate the heat loss per unit length of the tube by convection when a second shield of 0.14-mdiameter is installed, with the second shield maintained at 35°C. Compare the result to that for thesingle shield of the example.
(b) In the two-shield configuration of part (a), the air gaps formed by the annular concentric tubes are L = 10 mm . Calculate the heat loss per Unit length if the gap dimension is L = 15 mm . Do you expect the heat loss to increase or decrease?

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Chapter 9 Solutions

Fundamentals of Heat and Mass Transfer

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