Question: Airflow through a long, 0 . 1 - m - square air conditioning duct maintains the outer duct surface temperature at 1 0 C .

Airflow through a long, 0.1-m-square air conditioning duct maintains the outer duct surface temperature at 10C. If the horizontal duct is uninsulated and exposed to air at 35C in the crawlspace beneath a home, what is the heat gain per unit length of the duct?
Evaluate the properties of air at T,=300 K. For the sides of the duct, use the more accurate Churchill and Chu correlations for
laminar flow on vertical plates.

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