Duct Fitting Loss Coefficients: entry_bellmouth_from_collector
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 |
|---|---|---|---|---|---|
| entry_bellmouth_from_collector | all | 0.03 | ER2-1 | ER2-1 Bellmouth entry from collector plenum; r/Di=0.21; C referenced to downstream duct Vp | ASHRAE Handbook Fundamentals 2021 Ch.21 |
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