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

Air Ducts - Minor Loss Coefficient Diagrams

Minor loss coefficient diagrams for air ductwork, bends, expansions, inlets and outlets  - SI units.

Minor loss in air ducts based on a summarized minor loss coefficients and air flow velocity:

• 1 Pa = 1 N/m2 = 1.4504x10-4 lb/in2 = 1x10-5 bar = 4.03x10-3 in water = 0.336x10-3 ft water = 0.1024 mm water = 0.295x10-3 in mercury = 7.55x10-3 mm mercury = 0.1024 kg/m2 = 0.993x10-5 atm

Minor loss for some common duct-work components like bends, expansions, inlets and outlets can be estimated from the diagrams below.

Minor Loss Coefficients - Bends

The minor loss coefficients in 90o bends can be estimated with the diagram below.

The minor loss in bends 0 - 180o can be estimated with the equation

ξ0-180 = ξ90 α / 90                                            (1)

where

ξ0-180 = minor loss coefficient for the bend with the actual angle

ξ90 = minor loss coefficient for the 90o bend according the diagram above

α = angle of the actual bend

The minor loss coefficient in a 90o bend like the one below is 1.0.

Related Topics

• Ventilation Systems

Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Related Documents

• Air Duct Components - Minor Dynamic Loss Coefficients

Minor loss (pressure or head loss) coefficients for air duct components.
• Air Duct Velocities

Typical air duct velocities in applications like ventilation systems or compressed air systems.
• Air Ducts - Friction Loss Diagram

A major friction loss diagram for air ducts - SI units.
• Energy Equation - Pressure Loss vs. Head Loss

Calculate pressure loss - or head loss - in ducts, pipes or tubes.
• Equivalent Length vs. Minor Pressure Head Loss in Pipe and Duct Components

Minor pressure and head loss in pipes vs. equivalent length in tubes and duct systems.
• Pipe and Tube System Components - Minor (Dynamic) Loss Coefficients

Minor loss coefficients for components used in pipe and tube systems.
• Rectangular Air Ducts - Velocity Diagram

Velocity diagram for rectangular air ducts - metric units.
• Ventilation Ducts - Minor Loss Resistance

Minor pressure or head loss in ventilation ducts vs. air velocity - minor loss coefficient diagram.

Search

Search is the most efficient way to navigate the Engineering ToolBox.

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 older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

Citation

• The Engineering ToolBox (2008). Air Ducts - Minor Loss Coefficient Diagrams. [online] Available at: https://www.engineeringtoolbox.com/air-duct-minor-loss-diagram-d_332.html [Accessed Day Month Year].

Modify the access date according your visit.

8.21.8

.