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Duct Sizer

The document is a duct size calculator that provides calculations for duct sizing in both SI and IP units. It calculates the air volume, duct size dimensions, duct material, roughness, equivalent and hydraulic diameters, velocity, velocity pressure, Reynolds number, friction factor and duct friction. The user is instructed to only change the yellow highlighted duct friction value and height factor while keeping all other values and formulas the same.

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xalid Abdulrahman
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126 views5 pages

Duct Sizer

The document is a duct size calculator that provides calculations for duct sizing in both SI and IP units. It calculates the air volume, duct size dimensions, duct material, roughness, equivalent and hydraulic diameters, velocity, velocity pressure, Reynolds number, friction factor and duct friction. The user is instructed to only change the yellow highlighted duct friction value and height factor while keeping all other values and formulas the same.

Uploaded by

xalid Abdulrahman
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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DUCT SIZE CALCULATOR (SI)

A. AIR VOLOUME (L/s) 934


W H
B. DUCT SIZE (MM) 660 305
C. DUCT MATERIAL GALVANISED

D. ABS ROUGHNESS(mm) 0.15

E. EQUIVALAENT DIAMETER (MM) 481.6

F. HYDRAULIC DIAMETER (MM) 417.2

G. DUCT VELOCITY (m/s) 4.6

H. VELOCITY PRESSURE (Pa) 13.0

I. REYNOLDS NO.(Re) 128,534

J. FRICTION FACTOR (f) 0.01872

K. DUCT FRICTION (Pa/ M) 0.582

For this calculation pleae check only duct friction &


height factor

HEIGHT AS PER AVAILABILITY OF SPACE.

DUCT FRICTION AS PER RECOMMENDED VALUE.

ONLY INPUT YELLOW FIGURE.


DON'T CHANGE ANY OTHER VALUE OR FORMULAE.

A= 9.3845E+20
B= 2.7911E-09
f= 0.01916846
DUCT SIZE CALCULATOR (IP)

A. AIR VOLOUME (CFM) 4000


W H
B. DUCT SIZE (INCH) 46 14
C. DUCT MATERIAL GALVANISED

D. ABS ROUGHNESS (ft) 0.0005

E. EQUIVALAENT DIAMETER (INCH) 26.6

F. HYDRAULIC DIAMETER (INCH) 21.5

G. DUCT VELOCITY (FPM) 894.4

H. VELOCITY PRESSURE (Inch) 0.050

I. REYNOLDS NO.(Re) 164,352

J. FRICTION FACTOR (f) 0.01767

K. DUCT FRICTION (Inch/ 100 FT) 0.049

For this calculation pleae check only duct friction &


height factor

HEIGHT AS PER AVAILABILITY OF SPACE.

DUCT FRICTION AS PER RECOMMENDED VALUE.

ONLY INPUT YELLOW FIGURE.


DON'T CHANGE ANY OTHER VALUE OR FORMULAE.

A= 3.297214E+21
B= 5.465843E-11
f= 0.016383154
1219.2

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