Radigan Engineering have a free to download excel spreadsheet. Taken from their website: When in the course of human events it becomes necessary to calculate the Darcy-Weisbach friction factor… engineer’s often throw up their hands, go back to their old …
Useful diagram for estimating the relative duct roughness factor in calculating pressure losses in ducts. It uses the Reynolds Number (Re) a dimensionless number which is obtained from where is the density of the air at temp and pressures …
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