The components of an electronic system dissipating 180 W are located in a 1-m-long horizontal duct whose cross section is 16 cm * 16 cm. The components in the duct are cooled by forced air, which enters at 27°C at a rate of 0.65 m3/min. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct, determine (a) the exit temperature of air and (b) the highest component surface temperature in the duct. As a first approximation assume flow is fully developed in the channel. Evaluate properties of air at a bulk mean temperature of 35°C. Is this a good assumption?
The components of an electronic system dissipating 180 W are located in a 1-m-long horizontal duct whose cross section is 16 cm * 16 cm. The components in the duct are cooled by forced air, which enters at 27°C at a rate of 0.65 m3/min. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct, determine (a) the exit temperature of air and (b) the highest component surface temperature in the duct. As a first approximation assume flow is fully developed in the channel. Evaluate properties of air at a bulk mean temperature of 35°C. Is this a good assumption?
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 1-m-long horizontal duct whose
cross section is 16 cm * 16 cm. The components in the duct
are cooled by forced air, which enters at 27°C at a rate of
0.65 m3/min. Assuming 85 percent of the heat generated
inside is transferred to air flowing through the duct and the
remaining 15 percent is lost through the outer surfaces of the
duct, determine (a) the exit temperature of air and (b) the
highest component surface temperature in the duct. As a first
approximation assume flow is fully developed in the channel.
Evaluate properties of air at a bulk mean temperature of
35°C. Is this a good assumption?
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