Duct Fitting Loss Coefficients: transition_abrupt_expansion
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_expansion | all | 1 | Abrupt (sudden) expansion from smaller to larger duct | Borda-Carnot loss; C=1.0 referenced to smaller duct velocity pressure; avoid this condition |
This is a sample. Search the full duct fitting loss coefficients dataset and 300+ more by creating a free account and accessing the database.
Get started for FREERelated data
damper_butterfly_50pct_open1 rowdamper_butterfly_fully_open1 rowelbow_45_smooth_r1.01 rowelbow_45_smooth_r1.51 rowelbow_90_mitered_double_vane1 rowelbow_90_mitered_single_vane1 rowelbow_90_mitered_unvaned1 rowelbow_90_rect_smooth_r1.01 rowelbow_90_rect_smooth_r1.51 rowelbow_90_smooth_r0.751 rowelbow_90_smooth_r1.01 rowelbow_90_smooth_r1.51 row