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The components of an electronic system dissipating 180 W are located in a 4-ft-long horizontal duct whose cross section is 6 in * 6 in. The components in the duct are cooled by forced air, which enters at 85°F at a rate of 22 cfm and leaves at 100°F. The surfaces of the sheet metal duct are not painted, and thus radiation heat transfer from the outer surfaces is negligible. If the ambient air temperature is 80°F, determine (a) the heat transfer from the outer surfaces of the duct to the ambient air by natural convection and (b) the average temperature of the duct. Evaluate air properties at a film temperature of 100°F and 1 atm pressure. Is this a good assumption?

The components of an electronic system dissipating 180 W are located in a 4-ft-long horizontal duct whose cross section is 6 in * 6 in. The components in the duct are cooled by forced air, which enters at 85°F at a rate of 22 cfm and leaves at 100°F. The surfaces of the sheet metal duct are not painted, and thus radiation heat transfer from the outer surfaces is negligible. If the ambient air temperature is 80°F, determine (a) the heat transfer from the outer surfaces of the duct to the ambient air by natural convection and (b) the average temperature of the duct. Evaluate air properties at a film temperature of 100°F and 1 atm pressure. Is this a good assumption?

Elements Of Electromagnetics
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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The components of an electronic system dissipating
180 W are located in a 4-ft-long horizontal duct whose
cross section is 6 in * 6 in. The components in the duct are
cooled by forced air, which enters at 85°F at a rate of 22 cfm
and leaves at 100°F. The surfaces of the sheet metal duct are
not painted, and thus radiation heat transfer from the outer
surfaces is negligible. If the ambient air temperature is 80°F,
determine (a) the heat transfer from the outer surfaces of
the duct to the ambient air by natural convection and (b) the
average temperature of the duct. Evaluate air properties at a
film temperature of 100°F and 1 atm pressure. Is this a good
assumption?

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