= 20 mm. The A tube carries hot water across a factory in a tube with outer diameter Do tube surface is black, and the surroundings are at 20°C. You may neglect convection during your analysis. b) To reduce the rate of heat loss from the pipe, you decide to surround the pipe in a radiation shield. The shield material you have has inner and outer emissivities of E2,i = 0.01 and 2,0 = 0.1, respectively. Calculate the rate of heat transfer out of the tube, per unit length of tube, if the tube surface remains at 450°C and the radiation shield has a diameter of 60 mm.

= 20 mm. The A tube carries hot water across a factory in a tube with outer diameter Do tube surface is black, and the surroundings are at 20°C. You may neglect convection during your analysis. b) To reduce the rate of heat loss from the pipe, you decide to surround the pipe in a radiation shield. The shield material you have has inner and outer emissivities of E2,i = 0.01 and 2,0 = 0.1, respectively. Calculate the rate of heat transfer out of the tube, per unit length of tube, if the tube surface remains at 450°C and the radiation shield has a diameter of 60 mm.

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

A tube carries hot water across a factory in a tube with outer diameter Do = 20 mm. The
tube surface is black, and the surroundings are at 20°C. You may neglect convection during
your analysis.
b) To reduce the rate of heat loss from the pipe, you decide to surround the pipe in a
radiation shield. The shield material you have has inner and outer emissivities of
E2,i = 0.01 and 2,0 = 0.1, respectively. Calculate the rate of heat transfer out of the
tube, per unit length of tube, if the tube surface remains at 450°C and the radiation
shield has a diameter of 60 mm.
Shield, D₂ = 60 mm
2,0
E2,i
Heated tube, D₁₂ = 20 mm
Evacuated
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