Categorising the efficiency of air compressor.pdf

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1、CategorisingtheefficiencyofaircompressorsHughFalknerSydney,February2009CompressorEnergyconsumptionThebigsavingsmaybeinthesystem–butwhyignoresavingsinthecompressor?1CreatingalevelplayingfieldTechnologyneutral,don’tstifleinnovationDefinethefunctionalityExcludespecialsConsiderreallifeope

2、ratingconditionsEnhancedproductsalwayspresentaproblemSelectingacompressorReciprocatingorRotaryscrew(1or2stage)orCentrifugalReciprocating(andothers)CentrifugalRotaryTherequiredpressure/flowwillusuallydeterminewhichtypeisselected,butthereissomeoverlapItisnotjustaboutefficiency–needtocon

3、sideregnoiseandmaintenance2ReallifeoperatingconditionsFlowcanbehighlyvariableDemand-PartloadflowmaybeveryimportantTime-ManycompressorswillworkaspartofalargerinstallationDemandCompressorconfigurationPartLoadperformanceVariableSpeedCompressorsarenowpopular.tingModulaff/oonyarHowcanwegiv

4、ebenefittoaRotlproductthatisbestatpartSDtroVnoloadandworstatfullload?ffc/onOHowshouldwepenalisePower(%ofmaximumpower)compressorswithpoorpartDemand(%offullload)loadpowerconsumption?Indicativeonly–nottoscale3InletandoutletairqualityconditionsDefineinlettemperature,humidityandpressurecon

5、ditionsDefineoutlethumidity,particulatesandcontaminantsHigherqualityaircostsmoreenergyOilinjectedvsoilfreecompressors?Oilfreearemoreefficient,butcostmorePackagedequipment–integraldryersForconvenience,somecompressorsincludeintegralairtreatmentequipment.Dependingonthetypeofairtreatment,

6、thismightrepresenta5-10%energypenalty.Itmightalsogiveanetsystemenergysaving.Howshouldthisbeaccountedfor?4HeatRecoveryoptions80-90%oftheenergyconsumedbyanaircompressorcanberecoveredaswasteheat.HeatrecoveryequipmentwillcarryacompressorenergypenaltyUsesforrecoveredheat:•Buildingservices•

7、Process•Airtreatment•Boilerpre-heatingSummaryItshouldbepossibletoclassifyaircompressorsbyefficiency,but:Mustensurethatperformanceconsideredonthebasisofthesameinletandoutletconditions.Doyoucategorisebytypeofcompressor?Howdoyouaccountforintegraldryingorheatrecovery?Howdoyou/doyoutakeacc

8、ounto