Sulzer ABS PC 441 - Energy Efficiency: Kwh;Volume Unit

81307063I
EN
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Example Figure 3-8 shows how the PC 441 handles the calculations when the pump curves and
 systemcurveareset:
4 pumps in parallel selected for 2000 l/s @ 10 m
Figure 3-8
System curve
(Settings – Pump pit – Station Flow – Meas. Parameters – System Curve:
[Whenonepumpisrunning])
Static Head Duty Point: 4.00 meters
Total Head Duty Point: 4.8 meters
Flow at Duty Point: 740 l/s
1 pump running 3 pumps running
For this pump 740 l/s Totalow1720l/s
Whenonly1pumpisrunning
thereisnoneedforanycompen-
sationfactor,gives100 %.
Meaning1720-1300=420l/s
Fortheindividualpump1720/3=573l/s.
That gives a compensation factor of 77 %.
2 pumps running 4 pumps running
Totalow1300l/s Totalow2000l/s
Meaning1300-740=660l/smorethan1
pump operating.
Fortheindividualpump1300/2=650l/s.
That gives a compensation factor of 88 %.
Meaning2000-1720=280l/s
Fortheindividualpump2000/4=500l/s.
That gives a compensation factor of 69 %.
3.2.4 Energyeciency:kWh/volumeunit
Energye󰀩ciency(kWh/volume)isacalculatedvalue,fromaccumulatedpowerconsumptionandaccumulated
outow.Powerconsumptionisavailablewhenapowermonitorisattachedtothesystem.Correctvolumeac-
cumulationrequiressetupofpumpcapacitycalculation(e.g.providingpitarea),seesection 3.2regardingow
calculation.
Energye󰀩ciencyandallotheraccumulatedvaluesarekeptinPC441asagrandtotalandasdailyvalues,
sevendaysprior.Theenergye󰀩ciencyvalueshowninmaindisplay,istoday’svalue,thatresetsatmidnight
andupdatesonactualpumpperformance.Thisaveragedayvaluegivesagoodreectionofactualpump
energyusageandstationperformance.