A building requires a volume of 3 m3s-1 of fresh air. The air is supplied from a conditioning plant a distance of 120 m away for which the permissible pressure drop along the supply duct is 5 kNm-2 . Determine the required pipe diameter if the variation of friction factor is

 

Reynolds number (Re) 104 Friction factor (f) 0.009 The air has a density of 1.2 kgm and viscosity of 1.7 ~ 10-Nsm-. 2 x 10 105 0.008 0.007 106 0.0069 107 0.0068