Engineering, 23.11.2019 05:31 gardinerr410

Airflow through a long, 0.15-m-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 in the crawlspace beneath a home, what is the heat gain per unit length of the duct? evaluate the properties of air at 300 k. for the sides of the duct, use the more accurate churchill and chu correlations for laminar flow on vertical plates.
what is the rayleigh number for free convection on the outer sides of the duct? 7709251
what is the free convection heat transfer coefficient on the outer sides of the duct, in w/m2·k? 4.87
what is the rayleigh number for free convection on the top of the duct? 965073
what is the free convection heat transfer coefficient on the top of the duct, in w/m2·k? need here
what is the free convection heat transfer coefficient on the bottom of the duct, in w/m2·k? need here
what is the total heat gain to the duct per unit length, in w/m? need here
i cant figure out 4,5 and 6. i swear they are correct but the online homework won't take it.

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