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44 TRG-TRC013-EN
notes
period three
Fan Capacity Control
There are four methods used to actively control the capacity of a fan. They are
discharge dampers, inlet vanes, fan-speed control, and variable-pitch blade
control.
Discharge Dampers
The first method to be discussed is the use of discharge dampers. Discharge
dampers match the airflow and static pressure supplied by the fan with the
airflow and static pressure required by the system. They accomplish this by
adding a static-pressure loss to the system just downstream of the fan.
Methods of Fan Capacity Control
▲ Discharge dampers
▲ Inlet vanes
▲ Fan-speed control
▲ Variable-pitch blade control
Figure 65
Discharge Dampers
discharge
discharge
dampers
dampers
supply
supply
fan
fan
Figure 66