Friction pressure losses in pipes and ducts

If the pipes are not circular section (oblong or rectangular type ventilation or air flow) the diameter used is the equivalent diameter or hydraulic diameter

For network fluid is calculable in 3 straight parts:

- 1 part accumulating 11.5 meters circular section diameter 40 mm

- 2 part 2 meters circular section diameter 80 mm

- 3 part 6.5 meter section oblong width 140 mm and height 80 mm

detailed procedure part 1 :

Select the tab friction pressure loss and enter:

 1 -- diameter : 40 mm

2 -- flow : 0.006 m3/sec

3 - length: 11.5 meters

4 -- roughness : Plastic (roughness proposed may be amended)

5 - the density (default nothing to change) water 1000Kg/m3

6 - the fluid and temperature : (Default nothing to change) water at 20 ° C (this gives you the viscosity, you can modify.)

7 -- gravity (default, 9.81m / s ²)

- Click calculate The results sheet appears:

-Record your results to a file by clicking Save on the toolbar (it is offered to add your listing to an existing file, click and not create a file example1) it is advisable to save all your results the same network in the same file.

-Close the window "results sheet" results are displayed in the Inventory loss of regular charges.

- In the 'Inventory you can add successive results that you will now calculate:

- To the flat portions 2 and 3 follow as part 1 (change data clears the previous results)

(for the 3 click " "And enter the height and width of the conduit to get the equivalent diameter of the oblong section)

results of calculation can be found in the inventory

others exemples 

now turn to pressure drop losses in elements

continue with pressure drop in a valve