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TRG-TRC013-EN 49
period three
Fan Capacity Control
notes
along the VAV system modulation curve and the fan satisfies the system
static-pressure controller.
The low end of the fan’s modulation range is limited by the surge region. The
principal advantages of fan-speed control are its energy saving potential and
reduced noise at part load.
Variable-Pitch Blade Control
Finally, the capacity of variable-pitch vaneaxial (VPVA) fans can be modulated
by swiveling the fan blades to vary their pitch (angle).
Variable-Pitch Blade Control
variable-pitch
variable-pitch
blades
blades
Figure 73