Smacna Duct Fitting Loss Table [PDF]

DUCT DESIGN TABLES Table 14-10 LOSS COEFFICIENTS, ELBOWS (Cont.) Use the velocity pressure (Vp) of the upstream secti

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Smacna Duct Fitting Loss Table [PDF]

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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