Duct fitting pressure drop coefficients for
mitered, rectangular elbow with single-thickness vanes
From ASHRAE (1989), with permission
The pressure drop coefficient is given by C = KRE · C'
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Design no. |
Dimensions, |
C |
||
r |
s |
L |
||
1* |
2.0 |
1.5 |
0.75 |
0.12 |
2 |
4.5 |
2.25 |
0 |
0.15 |
3 |
4.5 |
3.25 |
1.60 |
0.18 |
*When extension of trailing edge is not provided for this vane, losses are approximately unchanged for single elbows, but increase considerably for elbows in series.