15 cm bare oxidized steel (Ɛ = 0.79) pipe (16.8 cm O.D.) carrying steam at a high temperature is enclosed in a 30 x 30 cm red brick (Ɛ = 0.80) conduit having wall temperatures somewhat lower than the pipe diameter. What

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
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Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.36P
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 A 15 cm bare oxidized steel (Ɛ = 0.79) pipe (16.8 cm O.D.) carrying steam at a high temperature is enclosed in a 30 x 30 cm red brick (Ɛ = 0.80) conduit having wall temperatures somewhat lower than the pipe diameter. What percentage of the heat lost by radiation from the pipe would be saved if the conduit walls were painted with aluminum paint (Ɛ = 0.52)

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