The components of an electronic system dissipating 150W are located in a 1-m-long horizontal duct whose cross section is 15 cm x 15 cm. The components in the duct are cooled by forced air, which enters at 30°C at a rate of 0.4 m³/min and leaves at 45°C. 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 25°C, 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. Natural convection 25°C 45°C 150 W Forced air 30°C

The components of an electronic system dissipating 150W are located in a 1-m-long horizontal duct whose cross section is 15 cm x 15 cm. The components in the duct are cooled by forced air, which enters at 30°C at a rate of 0.4 m³/min and leaves at 45°C. 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 25°C, 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. Natural convection 25°C 45°C 150 W Forced air 30°C

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

The components of an electronic system dissipating 150W are located in a 1-m-long horizontal duct whose cross section is 15 cm x 15 cm.
The components in the duct are cooled by forced air, which enters at 30°C at a rate of 0.4 m³/min and leaves at 45°C. 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 25°C,
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.
Natural
convection
25°C
45°C
150 W
Forced
air
30°C

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