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TRG-TRC013-EN 5
period one
Fan Performance
notes
The total amount of pressure generated by a fan has two components: velocity
pressure and static pressure. The velocity pressure is due to the momentum
of the air as it moves axially through the duct, while the static pressure is due
to the perpendicular outward “push” of the air against the duct walls.
The total pressure is the sum of the velocity pressure and the static pressure.
For example, assume a fan is attached to a straight piece of duct that has a
damper at the open end. To observe air movement, a hinged vane is suspended
from the top of the duct.
Total Pressure
velocity
velocity
pressure
pressure
static
static
pressure
pressure
total pressure (P
total pressure (P
t
t
) = static pressure (P
) = static pressure (P
s
s
) + velocity pressure (
) + velocity pressure (
P
P
v
v
)
)
fan
fan
Figure 7
Velocity Pressure vs. Static Pressure
damper
damper
vane
vane
fan
fan
Figure 8