Q4. Airflow through a long. 0.2m square air conditioning duct maintains the outer duct surface temperature at 10 "C. If the horizontal duct is uninsulated and exposed to air at 35 °C as shown in the figure below, what is the heat gain per unit length of the duct?

Q4. Airflow through a long. 0.2m square air conditioning duct maintains the outer duct surface temperature at 10 "C. If the horizontal duct is uninsulated and exposed to air at 35 °C as shown in the figure below, what is the heat gain per unit length of the duct?

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 7.37P

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Question

04. Airflow through a long. 0.2m square air conditioning duct maintains the outer duct
surface temperature at 10 °C. If the horizontal duct is uninsulated and exposed to air at 35 °C
as shown in the figure below, what is the heat gain per unit length of the duct?
Air,
Too-35°C
NW-0.2m
H=0.2 m
-T₂-10°C

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