A two branch duct system of circular duct is shown below. The fittings have the following equivalent lengthof straight duct upstream to branch 4m elbow 2m. There is negligible pressure loss in the straight throughsection of the branch. The designer slects 4pa/m as the pressure gradient in the 12- and -15m straight sections. What diameter in should be selected in the 15 m branch section?

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Hydronics