Duct Fitting Loss Coefficients: elbow_90_smooth_r0.75
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_smooth_r0.75 | all | 0.33 | 90-degree round duct elbow radius ratio R/D=0.75 | Short radius elbow; use only when space is critically limited |
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