Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Fan Capacity Diagrams

Pressure, head, air flow volume and fan capacity diagrams

Sponsored Links

Pressure head as function of air flow volume may be expressed in a diagram like the one below:

  • red lines are pressure heads as function of air volume flow and speed of the fan
  • green lines marked - l - are throttle lines
  • blue lines are power consumption

Pressure and Head

Operation of fans are often expressed in terms of pressure

pt = ps + pd = constant                                          (1)

where

pt = total pressure (Pa, N/m2)

ps = static pressure (Pa, N/m2)

pd = dynamic pressure (Pa, N/m2)

Dynamic pressure can be expressed as

pd = ρ v2 / 2                                                  (2)

where

ρ = density of air (kg/m3)

v = flow velocity (m/s)

Head developed can be expressed as

dp = ps2 - ps1 + (v22 - v12) ρ / 2                                                (3)

where

subscription 1 is the inlet of the fan and subscription 2 is the outlet

Sponsored Links

Related Topics

Related Documents

Sponsored Links

Share

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Topics

Unit Converters

Temperature

oC
oF


Load Calculator!

Length

m
km
in
ft
yards
miles
naut miles


Load Calculator!

Area

m2
km2
in2
ft2
miles2
acres


Load Calculator!

Volume

m3
liters
in3
ft3
us gal


Load Calculator!

Weight

kgf
N
lbf


Load Calculator!

Velocity

m/s
km/h
ft/min
ft/s
mph
knots


Load Calculator!

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


Load Calculator!

Flow

m3/s
m3/h
US gpm
cfm


Load Calculator!

1 22

This website use cookies. By continuing to browse you are agreeing to our use of cookies! Learn more