Greenheck-fan Mixed Flow Fans Belt and Direct Drive QEI-L Manual de usuario descargar pdf (Pagina 11)

Belt Drive versus Direct Drive

Example of Annual Operating Cost Savings

Forasystemperformancerequirementof25,000cfmat2.5inchesofstaticpressure(wg)thecorresponding

operatingpowerrequirementsare13.97BhpwithaQEI-Isize36and19.8Bhpforasize36tubularcentrifugalfan.

Formulas:

-Kilowatt-Hours=(OperatingPower(Bhp)x0.746xHoursofOperation)/MotorEfficiency

-OperatingCost=Kilowatt-HoursxPowerCostperkWhour

Assumptions:

-Costofelectricityis$0.09perkilowatthour

-3,120annualhoursofoperation(12hoursperday,fivedaysaweek,52weeksayear)

-93.0%motorefficiency(equaltoNEMAPremiumminimumefficiencyfor15and20hp,ODP,1725rpmmotor)

Annual Operating Cost Savings = $4,460 - $3,147 = $1,313

High Efficiencies = Lower Operating Costs

Tubular Centrifugal Fan

kW-Hours=(19.8Bhpx0.746x3120)/0.93=49,554

OperatingCost=49,554x$0.09=$4,460

QEI-I - Mixed Flow Fan

kW-Hours=(13.97Bhpx0.746x3120)/0.93=34,963

OperatingCost=34,963x$0.09=$3,147

Belt Drive Advantages

• Lowersoundlevels

• Motoroutoftheairstreamforeasyaccess

• Motorsizemaybechangedtoaccommodate

possiblefutureaircapacityrequirements

• Finalsystembalancingaccomplishedby

changingdrives

Direct Drive Advantages

• Fewerwearcomponentsandlessmaintenance,no

shaft,bearings,pulleys,orbelts

• Morecompactthanequivalentbeltdrivesize

• Motorinairstreamforincreasedmotorefficiency

andcooling

• Equalloadingbetweenmountingbrackets

• Finalsystembalancingaccomplishedbyadjusting

themotorspeed(ex.variablefrequencydriveuse).

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 51 52

Sin comentarios

Greenheck-fan Mixed Flow Fans Belt and Direct Drive QEI-L Manual de usuario Pagina 11