Answered: is exposed to cooler air at 30 °C with…

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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A steel tube with 5 cm ID, 7.6 cm OD and k = 15 W/m °C is covered with an insulative covering of thickness 2 cm and k = 0.2 W/m °C. A hot gas at 330 °C with h= 400 W/m² °C flows inside the tube. The outer surface of the insulation is exposed to cooler air at 30 °C with h = 60 W²/m °C. Calculate the heat loss from the tube to the air for 10 m of the tube and the temperature drops resulting from the thermal resistances of the hot gas flow, the steel tube, the insulation layer, and the outside air. (Ans: q/L=7451.72 W; AT₁=11.859 °C; AT₂=3.31 °C; AT₁=250.75 °C; AT₁= 34.07 °C)

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