A pipe 40 cm in diameter contains steam at 100°C and is covered with asbestos (K = 0.0006 cal/cm*deg*sec) 10 cm thick. The outside temperature is kept at 60°C. How much should the thickness be increased in order that the rate of heat loss will be decreased by 25%?

A pipe 40 cm in diameter contains steam at 100°C and is covered with asbestos (K = 0.0006 cal/cmdegsec) 10 cm thick. The outside temperature is kept at 60°C. How much should the thickness be increased in order that the rate of heat loss will be decreased by 25%?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.70P: The thermal conductivity of fibreglass insulation at 67F is 0.02 Btu/h ft F. What is its value in SI...

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Question

A pipe 40 cm in diameter contains steam at 100°C and is covered with asbestos (K = 0.0006 cal/cm*deg*sec) 10 cm thick. The
outside temperature is kept at 60°C. How much should the thickness be increased in order that the rate of heat loss will be
decreased by 25%?
(A) 14.34 cm
B) 4.34 cm
34.14 cm
D) 24.43 cm

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