Calculation of the efficieny:
- Enter volume flow V at best efficiency point.
- Enter the pump head H at best efficiency point.
- Enter power reserve S.
The minimum efficiency
at best efficiency point will be calculated according to EU 547-2012 (η1,BEP
In addition the minimum efficiencies at 75% volume flow (partial load, PL) and 110% volume flow (overload, OL) will be determined.
The efficiency of the gearbox and the coupling will be set to 1 (η2
With factor S (1 <= S <= 2) you determine how much reserve output a IEC norm motor should at least have. The nominal power
will be chosen from
the following rating chart.