Duct Fitting Loss Coefficients: elbow_90_7gore_r2.5
Loss coefficients (C-values) for duct fittings — elbows, tees, wyes, transitions, entries, exits, and specialty fittings per ASHRAE Fundamentals and SMACNA. dP = C * Vp where Vp is velocity pressure at the referenced duct cross-section.
| fitting type | size or range | C0 (dimensionless) | ashrae code | geometry notes | standard |
|---|---|---|---|---|---|
| elbow_90_7gore_r2.5 | all | 0.11 | CD3-10 | CD3-10 Round duct 90-degree 7-gore elbow r/D=2.5; low-loss gored construction; from industrial exhaust example | ASHRAE Handbook Fundamentals 2021 Ch.21 |
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