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Bending loss in 180 degrees square duct

Bending loss in 180 degrees square duct

Bending loss in 180 degrees square duct

(OP)
Hi there!

Is there anyone who can tell me how you can calculate the pressure drop in a 5-sections bending of 180 degrees, where the inner radius is nearly zero?

I´m talking about a square duct with the following measurements:

section 1: 0.496 mtr
section 2: 0.354 mtr
section 3: 0.251 mtr
section 4: 0.354 mtr
section 5: 0.496 mtr

The height is 0.416 mtr, but is not relevant for the calculation I think?! Only when I need a Dh.

As you see the duct is getting smaller between the first 3 sections and after that it is getting bigger again. The bending is just like 2 times 45 degrees bendings, then a piece of rectangular duct and again 2 times a 45 degrees bendings. The rectangular duct is only on one side rectangular, because on the innerside there is the inner bending nearly zero.

You can see it like this:

   
|  |  |
\___/


I hope anyone can help me to calcute the bending loss for a duct like this.

RE: Bending loss in 180 degrees square duct

I would suggest that you ask this question over on the HVAC/R engineering Forum.  Those guys know all about ductwork.

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