Hot air at atmospheric pressure and 85°C enters a 10-m-long uninsulated square duct of cross section 0.15 m * 0.15 m that passes through the attic of a house at a rate of 0.1 m3/s. The duct is observed to be nearly isothermal at 70°C. Determine the exit temperature of the air and the rate of heat loss from the duct to the air space in the attic. Evaluate air properties at a bulk mean temperature of 75°C. Is this a good assumption?
Hot air at atmospheric pressure and 85°C enters a 10-m-long uninsulated square duct of cross section 0.15 m * 0.15 m that passes through the attic of a house at a rate of 0.1 m3/s. The duct is observed to be nearly isothermal at 70°C. Determine the exit temperature of the air and the rate of heat loss from the duct to the air space in the attic. Evaluate air properties at a bulk mean temperature of 75°C. Is this a good assumption?
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.34P
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Hot air at atmospheric pressure and 85°C enters a
10-m-long uninsulated square duct of cross section 0.15 m *
0.15 m that passes through the attic of a house at a rate of
0.1 m3/s. The duct is observed to be nearly isothermal at 70°C.
Determine the exit temperature of the air and the rate of heat
loss from the duct to the air space in the attic. Evaluate air
properties at a bulk mean temperature of 75°C. Is this a good
assumption?
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