Duct Fitting Loss Coefficients: transition_abrupt_contraction
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 |
|---|---|---|---|---|
| transition_abrupt_contraction | all | 0.5 | Abrupt (sudden) contraction from larger to smaller duct | Vena contracta effect; C referenced to smaller (downstream) velocity pressure |
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