DUCT
DESIGN
TABLES
Table 14-10 LOSS COEFFICIENTS, ELBOWS (Cont.)
Use the velocity pressure (Vp) of the upstream section. Fitting loss (TP) = C x Vp
D. Elbow, Rectangular, Mitered (15)
E. Elbow, Rectangular, Mitered with Converging or Diverging Flow (15)
F. Elbow, Rectangular, Smooth Radius without Vanes (15)
U.S. Units
For Standard Air:
Re = 8.56 DV
(Metric Units)
(Re = 66.4 DV)
where:
D = duct diameter, inches (mm)
V = duct velocity, fpm (m/s)
For Rectangular Ducts:
14.20
AND
CHARTS
CHAPTER 14
Table 14-10 LOSS COEFFICIENTS, ELBOWS (Cont.)
Use the velocity pressure (Vp)of the upstream section. Fitting loss (TP) = C x Vp
G. Elbow, Rectangular, Smooth Radius with Splitter Vanes (2)
NOTES FOR THIS FIGURE ONLY:
A) See Page 5.14 to calculate splitter vane spacing.
B) CR = Curve Ratio
C) Use correction factors in Note 1 on Page 14.19 for elbows
other than 90°.
14.21