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Bending loss in 180 degrees square duct

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Roykonnecho

Chemical
Mar 2, 2005
5
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.
 
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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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