Correct Answer - Option 1 : Fan volume and fan total pressure
Power output of a fan:
The ideal power consumption for a fan (without losses) can be expressed as
Pi = dp q
Where
Pi = ideal power consumption (W)
dp = total pressure increase in the fan (Pa, N/m2)
q = air volume flow delivered by the fan (m3/s)
Therefore, the power output of a fan is based on fan volume and fan total pressure.
Fan Efficiency:
The fan efficiency is the ratio between power transferred to airflow and the power used by the fan. The fan efficiency is in general independent of the air density and can be expressed as:
ηf = dp q / P
Where
ηf = fan efficiency (values between 0 - 1)
dp = total pressure (Pa)
q = air volume delivered by the fan (m3/s)
P = power used by the fan (W, Nm/s)
