As shown in the figure, the water flows from the ground floor of a three-storey house to the second floor through pipes of 20 mm diameter (average roughness of the pipe material = XXXXXXXXXXmm) at a...

As shown in the figure, the water flows from the ground floor of a three-storey house to the second floor through pipes of 20 mm diameter (average roughness of the pipe material = 0.0015 mm) at a volumetric flow rate of 0.75 L / s. Water is discharged from the system to atmospheric pressure through a tap with a 12 mm diameter outlet. There are 4 winged elbows, one ball valve and one faucet throughout the installation. Calculate the effective pressure at point 1.

(p_water=998 kg/m³, u_water=1.12x10-3 Pa s, g=9.81 m/s²)

Extracted text: 3.5 m 3.5 m J(2) Faucet K = 2 3.5 m 1.75 m Open Ball Valve Kx = 10 3.5 m (1) winged elbow 90° Kx = 1.5 -5.25 m