HELP NEEDED

[dan]

hi everyone,i am doing a thermal solar energy course and im having problems
with a couple of test questions which i need help to solve if anyone is willing.
the course is an online course and its not in my native language so its sometimes difficult to get a grasp of
the theory and i have virtually no plumbing experience either.

the questions are......calculate the velocity of water in a copper tube with an internal diameter of 32 mm with a flow rate of 2000l/hr

calculate the pressure drop in a copper pipe of 1.5 inches with a flow rate of 3500 litros/hr

what diameter of steel pipe do we need for a pipe length total of 150m with a flow rate of 0.75l/s and we dont want the pressure drop to exceed 6m of water

if anyone could help it would be very useful to include the calculations please

[admin]

Here you can find how to calculate velocity:
http://www.pipeflowcalculations.com/pip ... locity.php

pressure drop:
http://www.pipeflowcalculations.com/pip ... fluids.php

Also there you can find calculators for all that you need at:
http://www.pipeflowcalculations.com/pip ... fluids.php

[dan]

thanks but im not clever enough to use the calculators,they seem to require more info than i have to start with.
is there no-one who can give me the answers and if poss with the calculus?

[admin]

Here is the velocity

1. volumetric flow rate (q): q = 2000 l/h
2. mass flow rate (w): w = 2000.0002 kg/h
3. diameter (D): D = 32 mm
4. velocity (v): v = 0.6907771 m/s
5. cross section area (A): A = 804.2478 mm2
6. density (ρ): ρ = 1000 kg/m3

Second questions requires pipe length to be known

And third problem with diameter question

1. volumetric flow rate (q): q = 0.74519414 l/s
2. mass flow rate (w): w = 2682.6968 kg/h
3. length (L): L = 150 m
4. diameter (D): D = 1.21 in
5. pipe roughness (kr): kr = 0.01 mm
6. density (ρ): ρ = 1000 kg/m3
7. kinematic viscosity (ν): ν = 1.006 mm2/s
8. dynamic viscosity (μ): μ = 0.0010060001 Pas
9. local resistance coefficient (K ): K = 0.0
10. velocity (V): V = 1.004485 m/s
11. cross section area (A): A = 741.8704 mm2
12. friction coefficient (f): f = 0.023905363
13. Reynolds number (Re): Re = 30687.717
14. boundary layer (δ): δ = 0.22845078 mm
15. pressure on the pipe start (p1): p1 = 6 bar
16. pressure on the pipe end (p2): p2 = 5.4114 bar
17. pressure drop (p1-p2): p1-p2 = 6 mWS