1. A pipe of outside diameter 20 mm is to be insulated with asbestos which has a mean thermal conductivity of 0.1 W/m-deg. The local coefficient of convective heat to the surroundings is 5W/m2-deg. Comment upon the utility of asbestos as the insulating material. What should be the minimum value of thermal conductivity of insulating material to reduce heat transfer? ANSWER: 0.05 W/m-C

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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1. A pipe of outside diameter 20 mm is to be insulated with asbestos which
has a mean thermal conductivity of 0.1 W/m-deg. The local coefficient of
convective heat to the surroundings is 5W/m?-deg. Comment upon the utility
of asbestos as the insulating material. What should be the minimum value of
thermal conductivity of insulating material to reduce heat transfer?
ANSWER: 0.05 W/m-C
Transcribed Image Text:1. A pipe of outside diameter 20 mm is to be insulated with asbestos which has a mean thermal conductivity of 0.1 W/m-deg. The local coefficient of convective heat to the surroundings is 5W/m?-deg. Comment upon the utility of asbestos as the insulating material. What should be the minimum value of thermal conductivity of insulating material to reduce heat transfer? ANSWER: 0.05 W/m-C
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