A coolant is transported in a pipe with external wall temperature of -30 °C and with outer diameter of 10 cm. The tube is thermally isolated by two layers: 1) an internal layer of foamed polypropylene with thermal conductivity of 0.08 W.m.K and thickness of 10 cm, and 2) an external felt layer with thermal conductivity of 0.05 W.m.K and thickness of 5 cm. Temperature of the outer surface is 25 °C. Calculate the heat flow from the surroundings to the tube with length of 100 m. What is the temperature on the boundary between polypropylene and felt layers?

A coolant is transported in a pipe with external wall temperature of -30 °C and with outer diameter of 10 cm. The tube is thermally isolated by two layers: 1) an internal layer of foamed polypropylene with thermal conductivity of 0.08 W.m.K and thickness of 10 cm, and 2) an external felt layer with thermal conductivity of 0.05 W.m.K and thickness of 5 cm. Temperature of the outer surface is 25 °C. Calculate the heat flow from the surroundings to the tube with length of 100 m. What is the temperature on the boundary between polypropylene and felt layers?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

VI.2 A coolant is transported in a pipe with external wall temperature of -30 °C and with outer
diameter of 10 cm. The tube is thermally isolated by two layers: 1) an internal layer of
foamed polypropylene with thermal conductivity of 0.08 W.m.K and thickness of 10 cm,
and 2) an external felt layer with thermal conductivity of 0.05 W.m.K and thickness of 5
cm. Temperature of the outer surface is 25 °C. Calculate the heat flow from the
surroundings to the tube with length of 100 m. What is the temperature on the boundary
between polypropylene and felt layers?
Result: The heat flow from the surroundings is approx. 1.77 kW. Temperature between
layers of isolation is 8.8 °C.

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