bb) Hot air at 60 °C leaving the furnace of a house enters a 12 m long section of a sheet metal duct of rectangular cross section 20 cmx 20 cm at an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.3, is with a convection heat transfer coe o the cold air at 10 °C in the basement, of 10 W/m2.°C. Taking the walls of the basement to be at 10 °C also, determine (a) the temperature at which the hot air will leave the basement and 6) the rate of heat loss from the hot air in the duct to the basement. (2622 W 45.1G)
bb) Hot air at 60 °C leaving the furnace of a house enters a 12 m long section of a sheet metal duct of rectangular cross section 20 cmx 20 cm at an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.3, is with a convection heat transfer coe o the cold air at 10 °C in the basement, of 10 W/m2.°C. Taking the walls of the basement to be at 10 °C also, determine (a) the temperature at which the hot air will leave the basement and 6) the rate of heat loss from the hot air in the duct to the basement. (2622 W 45.1G)
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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Transcribed Image Text:bb) Hot air at 60 °C leaving the furnace of a house enters a 12 m long section of a sheet
metal duct of rectangular cross section 20 cm x 20 cm at an average velocity of
4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the
duct, whose emissivity is 0.3, is exposed to the cold air at 10 °C in the basement,
with a convection heat transfer coeff
basement to be at 10 °C also, det
leave the basemeņt and 6) the rate of heat loss from the hot air in the duct to the
basement. (2622 W, 45.1 C)
y of 10 W/m².°C. Taking the walls of the
ine (a) the temperature at which the hot air will
Hma
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