Fan
Power Consumption
The ideal power
consumption of a fan (without losses) can be expressed as
Pi = dp q (1)
where
Pi = ideal power
consumption (W)
dp = total pressure
increase in the fan (Pa)
q = air volume flow delivered
by the fan (m3/s)
The ideal power
consumptions for fans at different air volumes and pressure increases are
expressed in the chart below:
Fan Motors and Starting Torques
A fan motor must be capable not only of driving the
fan at operating speed, but also be capable of accelerating the fan wheel to
the operating speed
A fan motor must be capable not only of driving the fan at operating
conditions, but also be capable of accelerating the fan wheel, drive and shaft
to the operating speed. For a fan transporting a large volume of air at low
static pressure the motor power required during the continuous operating
process may not be enough for starting the fan. Often a correct designed and
adjusted motor protection system will stop the fan before the windings are
overheated and insulation damaged.
The motor torque should during design be checked against the fan wheel
torque up to 90% of the synchronized speed.
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