The Free On-line Aquaculture Dictionary

Compressor / blower - Power equations

P = (Q x H) / (6.1 x n)
Where
P = Power (kW)
Q = Air flow (m3 / minute)
H = System head (m) =

sum of resistance head = suction head  + pipe losses + device losses (eg diffuser) + depth of water

n = Efficiency of compressor / blower typically 60% - 70%