Atmospheric air enters a 10-m-long,
Chapter 8, Problem 8.42(choose chapter or problem)
Atmospheric air enters a 10-m-long, 150-mm-diameteruninsulated heating duct at 60C and 0.04 kg/s. Theduct surface temperature is approximately constant atTs?15C.(a) What are the outlet air temperature, the heat rate q,and pressure drop ?pfor these conditions?(b) To illustrate the tradeoff between heat transfer rateand pressure drop considerations, calculate qand?pfor diameters in the range from 0.1 to 0.2 m. Inyour analysis, maintain the total surface area,As??DL, at the value computed for part (a). Plotq? , and Las a function of the duct diameter.
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