Hot air flows with a mass rate of m = 0.060 kg/s through an uninsulated sheet metal duct of diameter D = 0.18 m, which is in the crawlspace of a house. The hot air enters at 120 C and, after a distance of L = 5 m, cools to 80 C. The heat transfer coefficient between the duct outer surface and the ambient air at T, = 0 C is known to be ho = 6 W/m2 K. a. Calculate the heat loss (W) from the duct over the length L. h. Determine the heat flux and the duct surface temperature at x= 1.

Hot air flows with a mass rate of m = 0.060 kg/s through an uninsulated sheet metal duct of diameter D = 0.18 m, which is in the crawlspace of a house. The hot air enters at 120 C and, after a distance of L = 5 m, cools to 80 C. The heat transfer coefficient between the duct outer surface and the ambient air at T, = 0 C is known to be ho = 6 W/m2 K. a. Calculate the heat loss (W) from the duct over the length L. h. Determine the heat flux and the duct surface temperature at x= 1.

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

Hot air flows with a mass rate of m = 0.060 kg/s through an uninsulated sheet
metal duct of diameter D = 0.18 m, which is in the crawlspace of a house. The hot air
enters at 120 C and, after a distance of L = 5 m, cools to 80 C. The heat transfer
coefficient between the duct outer surface and the ambient air at T, = 0 C is known to
be ho = 6 W/m2 K.
a. Calculate the heat loss (W) from the duct over the length L.
h. Determine the heat flux and the duct surface temperature at x= 1.

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