5. Water (pwater 1000 kg/m³, μ- 103 Nes/m²) at 15 °C flows from basement to the second floor through the
4.5 cm diameter commercial steel pipe (s= 0.045 mm) at a rate of Q-45 L/min and exits through a faucet of
diameter 1.3 cm as shown below. Please determine the pressure at point (1) if all losses are included. The KL
values for the 90° elbow, globe valve and faucet are 1.5, 10 and 2, respectively. (20%) (Note that you may
use the Moody chart shown in the next page)
B
4.5.cm diameter
copper pipe
45 L/min
1.5 m
T
3 m
4.5 m-
(3)
(5)
-3 m-3m-
(7) (8)
880
3. m-7
3 m
K₁ = 2 based on
pipe
velocity
Wide open
globe valve
KL-10
Threaded
90° elbows: KL=1.5
(2)
1.3 cm
diameter