Duct Fitting Loss Coefficients: elbow_90_smooth_r1.0
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_r1.0 | all | 0.22 | 90-degree round duct elbow radius ratio R/D=1.0 | Standard radius elbow R/D=1.0; most common shop-fabricated elbow |
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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_r1.51 rowentry_duct_bellmouth1 row