FreeCalc.Com
On-Line Duct Friction Loss
Enter Single Duct Conditions Below:
PROJECT DATA:
Job Number:
Client:
Date:
Line Number:
Fluid:
DUCT AND FLOW CONDITIONS:
Duct Type:
CHOOSE DUCT TYPE
RECTANGULAR
ROUND
Rectangular Duct Dimensions:
Side a (in.):
Side b (in.):
Duct Diameter(in):
Duct Material
GALVANIZED METAL
BLACK IRON
ALUMINUM
STAINLESS STEEL
PVC
FLEXIBLE DUCT (WIRES EXPOSED)
FLEXIBLE DUCT (WIRES COVERED)
Flow Rate:
Pounds per Hour
SCFM
ACFM
MMSCFD
Viscosity (cP):
Typical Values
Temperature (F):
Gas Molecular Weight:
Typical Values
Specific Heat Ratio:
Typical Values
Inlet Pressure (PSIG):
Duct Length (ft):
Duct Entry Configuration (must choose one):
Hoods:
What do these hoods look like?
None
Plain Duct End
Flanged Duct End
Bellmouth Entry
Sharp Edged Orifice
Standard Grinder Hood (tapered t.o.)
Standard Grinder Hood (no taper)
Trap or Settling Chamber
Abrasive blast chamber
Abrasive blast elevator
Abrasive separator
Elevators (enclosures)
Flanged pipe plus close elbow
Plain pipe plus close elbow
Show me what a Tapered Hood looks like
Tapered Hoods
Taper Angle (degrees):
15
30
45
60
90
120
150
180
Hood Type:
RECTANGULAR OR SQUARE
CONICAL
Show me what a Compound Hood looks like
Compound Hoods
Slot Dimensions:
Slot Number:
Taper Angle (degrees):
Height (in.):
15
30
45
60
90
120
150
180
Length (in.):
Hood Type:
RECTANGULAR OR SQUARE
CONICAL
Other
Other Duct Type Loss Factor:
Branch Entries (Velocity change corrections):
Show me a branch entry configuration
Duct Segment Originates at Branch
Flow of # 1 Entering Branch (ACFM):
Velocity Pressure of # 1 Entering Branch (inches Water):
Flow of # 2 Entering Branch (ACFM):
Velocity Pressure of # 2 Entering Branch (inches Water):
Note: Sum of flows in branches # 1 and # 2 must equal Flow Rate in ACFM input above.
Elbows (choose up to three different elbow types):
Note: cannot mix round and regtangular ducts in a single calculation.
Round Ducts:
Show me what these round elbows look like
Number:
Type:
Stamped
5 piece
4 piece
3 piece
Mitered no vanes
Mitered turning vanes
Flatback
R/D:
0.5
0.75
1.00
1.50
2.00
2.50
Elbow Sweep (Degrees):
90
60
45
30
Number:
Type:
Stamped
5 piece
4 piece
3 piece
Mitered no vanes
Mitered turning vanes
Flatback
R/D:
0.5
0.75
1.00
1.50
2.00
2.50
Elbow Sweep (Degrees):
90
60
45
30
Number:
Type:
Stamped
5 piece
4 piece
3 piece
Mitered no vanes
Mitered turning vanes
Flatback
R/D:
0.5
0.75
1.00
1.50
2.00
2.50
Elbow Sweep (Degrees):
90
60
45
30
Rectangular Ducts (chose up to three different elbow types):
Show me what these rectangular elbows look like
Number:
Aspect Ratio (W/D):
0.25
0.5
1.0
2.0
3.0
4.0
R/D:
0.0
0.5
1.0
1.5
2.0
3.0
Number:
Aspect Ratio (W/D):
0.25
0.5
1.0
2.0
3.0
4.0
R/D:
0.0
0.5
1.0
1.5
2.0
3.0
Number:
Aspect Ratio (W/D):
0.25
0.5
1.0
2.0
3.0
4.0
R/D:
0.0
0.5
1.0
1.5
2.0
3.0
Filter(s) / Air Cleaner(s) / Miscellaneous Equipment (choose up to three):
Equipment Name:
Pressure Drop (inches Water)
Equipment Name:
Pressure Drop (inches Water)
Equipment Name:
Pressure Drop (inches Water)
Duct Exit Configuration (must choose one):
Main Duct Line
(Branch 1 in this
Drawing
)
Branch Entry
Branch Entry Angle (degrees):
10
15
20
25
30
35
40
45
50
60
90
(Branch 2 in this
Drawing
)
Show me what these expansions and contractions look like
Expansion within Duct
Taper Angle (degrees):
3.5
5
10
15
20
25
30
90
Diameter Ratio (Outlet Diameter/Inlet Diameter):
1.25:1
1.5:1
1.75:1
2:1
2.5:1
Is Expansion greater than 5 diameters from an elbow or fan?:
YES
NO
Expansion at End of Duct
Taper Lenght to Inlet Diameter Ratio:
1.0:1
1.5:1
2.0:1
3.0:1
4.0:1
5.0:1
7.5:1
Diameter Ratio (Outlet Diameter/Inlet Diameter):
1.2:1
1.3:1
1.4:1
1.5:1
1.6:1
1.7:1
Is Expansion greater than 5 diameters from an elbow or fan?:
YES
NO
Tapered Contaction
Taper Angle of Contraction(Degrees):
5
10
15
20
25
30
45
60
Over 60
Outlet Pipe Diameter (inches):
Vertical Discharge, No Loss
Copyright © 2000 FreeCalc.Com All Rights Reserved.
