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# Problem 1 A duct with diameter D, surface roughness e, and length L = 1500 feet...

## Question

###### Problem 1 A duct with diameter D, surface roughness e, and length L = 1500 feet...

Problem 1 A duct with diameter D, surface roughness e, and length L = 1500 feet transports air with specific weight Yair = 0.0752 lbs/ft at volume flow rate of Q = 9000 ft/min. A pressure gradient of Ap/L is measured in inch of water per 1500 feet of duct. Use either a graphical method (preferred) or a numerical iteration method to fill out the table below. Show all steps. If you choose to use a graphical method, show a Moody's chart and how you derive your answer. Pipe Flow Pressure gradient Surface diameter velocity Ap/L inches of roughness D (ft) V (ft/s) H20 per 1500' pipe) & (ft) (a) 3.0 21 1.50 ? (b) 3.0 21 ? 0.012 (c) 3.0 ? 1.50 0.012 (d) ? 21 1.50 0.012

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