Duct Fitting Loss Coefficients: tee_45deg_entry_sd5_12
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 |
|---|---|---|---|---|---|
| tee_45deg_entry_sd5_12 | branch | 0.64 | SD5-12 | SD5-12 Tee 45-degree entry branch; C_branch referenced to branch duct Vp; highest efficiency tee type | ASHRAE Handbook Fundamentals 2021 Ch.21 Tables 10-11 |
| tee_45deg_entry_sd5_12 | main | 0.15 | SD5-12 | SD5-12 Tee 45-degree entry branch; C_main referenced to common duct Vp; highest efficiency tee type | ASHRAE Handbook Fundamentals 2021 Ch.21 Tables 10-11 |
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