g

System Resistance

 

 

 

return duct

 

 

fan

supply duct

 

 

 

damper

cooling

 

return air grille

 

 

 

coil

 

 

 

 

 

supply

 

 

 

diffuser

g EH

x

Now that a typical fan performance curve has been developed, let’s see how the fan will perform within a system.

With each airflow, an air distribution system imposes a certain resistance to the passage of air. The resistance is the sum of all of the pressure losses experienced as air passes through the ductwork, supply air diffusers, return air grilles, dampers, filters, coils, etc. This is the resistance, or static-pressure loss, that the fan must overcome to move a given quantity of air through the system.

System Resistance

static pressure

2.0 in. H2O

[491 Pa]

3,500 cfm

[1.65 m3/s]

airflow

g EI

 

Assume that a system is designed to deliver 3,500 cfm [1.65 m9/s], and that to overcome the system pressure losses, the fan must generate 2.0 in. H8O [491 Pa] of static pressure.

To illustrate how a system resistance curve is developed, this point is plotted on the same chart used to develop the fan curve.

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Page 24
Image 24
Trane TRG-TRC013-EN manual System Resistance

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