Payback - VFD Calculator

The energy saving calculation results from a comparison between conventional flow and pressure control with variable speed pumps or fans (i.e. with Variable Frequency Drives).

Note: The flow rate varies with the rotation, and pressure with the square of the rotation, this means that in 70% of the rotation pressure will have a theoretical value of 50% nominal pressure.

Flow (%)	Time of operation per day (in hours)	Flow (%)	Time of operation per day (in hours)
100	01234567891112131415161718192021222324	50	01234567891112131415161718192021222324
90	01234567891112131415161718192021222324	40	01234567891112131415161718192021222324
80	01234567891112131415161718192021222324	30	01234567891112131415161718192021222324
70	01234567891112131415161718192021222324	20	01234567891112131415161718192021222324
60	01234567891112131415161718192021222324	10	01234567891112131415161718192021222324

Reference

ApplicationCentrifugal Pumps [Variable Frequency Drives x Valve]Centrifugal Pumps [Variable Frequency Drives x By-Pass]Ventilador/Exhaustor [Variable Frequency Drives x Intlet Damper]Ventilador/Exhaustor [Variable Frequency Drives x Outlet Damper]

CurrencyR$US$CAN$REURCHFKr$€Motor Power  kWHP (cv)

Resa (%)Giorni annuali di operazione

Energy cost per kWh ()VFD Price ()

Risultato

Annual Savings (kWh)		Annual Savings ()
Payback (months)