Duct Fitting Loss Coefficients: elbow_90_rect_smooth_r1.5
Loss coefficients (C-values) for duct fittings — elbows, tees, transitions, entries and exits per ASHRAE Fundamentals and SMACNA. dP = C * Vp where Vp is velocity pressure.
| fitting type | size or range | C0 (dimensionless) | description | geometry notes |
|---|---|---|---|---|
| elbow_90_rect_smooth_r1.5 | all | 0.12 | 90-degree rectangular duct elbow W/H=1 R/W=1.5 | Square aspect rectangular elbow; C varies with aspect ratio |
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