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1、BuildingEnergySavingfromChilled-WaterSystemOptimizationPeterXia,Ph.D.AsianR&DCenter,TheTraneCompanyABSTRACTAirconditioningconsumesnearly40%ofelectricityduringthehottestsummerperiod,whichcreatespowershortagesincitieslikeShanghai.Today,energyconservationhasbecomemoreu
2、rgentthaneverbefore.Mostefficiencyimprovementeffortshavefocusesonairconditioningequipmentitself.Systemefficiencyimprovementforthebuildinghasnotreceivedasmuchattentionasitdeserves.Thispaperexploresenergysavingthroughoptimizingchilledwatersystemthatincludeschiller,wat
3、erpumpsandcoolingtower.Theanalysisshowsthatoptimalchilledwatersystemdesignconditionmaybedifferentfromtoday’sstandarddesignandratingcondition.Thebenefitofchilledwatersystemoptimizationisnotonlyoperatingcostsaving,butfirstcostaswell.Achievingtrueoptimalsystemdesignand
4、operationrequiressystemdesigntools,wideoperatingrangechillersandintegratedsystemcontrollers.KEYWORDSEnergy,Chiller,System,Building,Chilledwater,Optimization,PowerINTRODUCTIONAstheweatherheatsup,concernsaboutpowersupplyarerisingasfastasthetemperature.Powershortagesdu
5、ringpeakousageperiodsaffecteveryone’slifeduetoshiftingworkinghours,enduringhigherroomtemperature(setpointis26Corhigherinsomecities),andevenlivingindarknessonceawhile.Eventuallyitaffectseconomicgrowth.Theobvioussolutionistoaddpowergenerationcapacitybybuildingmorepowe
6、rplants.Eventhoughtheelectricitypowergenerationcapacityincreaseseveryyear,powerdemandstillexceedspowersupplyandcatch-upisdifficultinthefaceofboominginvestment.Soattackingtheenergyconsumptionsideoftheequationisnecessary.Energyconservationcannotonlyreducethepressureof
7、constructingmorepowerplants,butalsoreducesgreenhousegasemissionsthatpollutetheenvironmentinwhichwelive.Insummer,itislargelyairconditioningthatdrivesuppowerusageabovepowerplantcapacity.Duringthehottestweeksofyear2003,forexample,nearly40percentofShanghai’selectricityc
8、apacityiseatenupbycoolingsystems.Reducingenergyconsumedbyairconditioningcandefinitelyalleviatepowershortageproblem.Ifbuildingownershadused
