CentralPlantOptimization10TM(CPO10)CentralPlantOptimization10TMetasysAdvancedTechnicalTraining2CentralPlantOptimization10TM(CPO10)ObjectiveAfterthissessionyouwillbeableto…….BetterunderstandwhatchillerplantconfigurationsaresupportedbyCPOIdentifyhowtospecifyrequiredandoptionalparametersintheCPOprimitivesDescribehowtosplitaCPOapplicationacrossmultiplecontrollersRecognizespecificCPOcommissioningtipsand‘gotchas’DescribewhatadditionalresourcesareavailabletoprovidemoreinformationMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining3CentralPlantOptimization10TM(CPO10)AgendaThissessionwillcoverthefollowing...CPOOverviewChillerSelectionPumpControlChillerStagingOptionsCoolingTowerControlControllerSelectionConsiderationsCPOCommissioningTipsand‘Gotchas’AvailableResourcesMetasysAdvancedTechnicalTraJohnsonControlsCompanyConfidential4OverviewCentralPlantOptimizationTM10JohnsonControlsCompanyConfiMetasysAdvancedTechnicalTraining5CentralPlantOptimization10TM(CPO10)OverviewCPO10isaControllerConfigurationTool(CCT)applicationthatwillsequence:chillerstowers,andassociatedpumpsinthemostefficientwaypossibletomatchbuildingcoolingload.Itishighlyflexible,butwillnotcoverallplantconfigurations.WhatisCPO10?MetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining6CentralPlantOptimization10TM(CPO10)Overview-MetasysImplementationEmbeddedinSystemSelectionToolDesignbySystemSelectionHighlyflexible(24“typicals”,pluscountlessvariations)SoftwaremodulesfactorytestedanddocumentedCustomizationsupportedEngineeringcollateralfromAIMtoolsTheresult:5-15%energysavings.MetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining7CentralPlantOptimization10TM(CPO10)Overview-SupportedConfigurationsUpto8chillers(centrifugal,screwcompressor,reciprocating)ofmixedsizes,pipedinparallel,allconstantspeedorallvariablespeedUpto8primarychilledwaterpumpsofmixedsizes,alldedicatedorallheadered,allconstantorallvariablespeedUpto8secondarychilledwaterpumpsofmixedsizes,pipedinparallel,variablespeedUpto8condenserwaterpumpsofmixedsizes,alldedicatedorallheadered,allconstantorallvariablespeedUpto8coolingtowers,singlespeed(withoptionalverniercontrol),multispeed,orvariablespeed,withavarietyoftower/sumpvalvearrangementsAircooledchillersalsosupportedMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining8CentralPlantOptimization10TM(CPO10)Overview-ControlStrategiesforSequencingChillersFourstrategiesareavailable,shownfrombesttoleasteffectivecontrolBuildingLoadNeedBTUmeter,orCHWsupply,returntempandflow.NeedtospecifyCHWmediapropertiesinLoadCalculatorprimitive.ChillerLoadNeedcurrentsensoror%FullLoadAmpfromeachchillerFlowDifferentialinprimary/secondarydecouplerpipeNeedBi-directionalflowsensor,orCalculateddifferentialfromprimaryandsecondarychilledwaterflowsPlantTemperatureDifferentialOnlyappliestoconstantspeedCHWpumpingarrangementsNeedCHWsupply&returntemperaturesMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining9CentralPlantOptimization10TM(CPO10)QuestionsMetasysAdvancedTechnicalTraJohnsonControlsCompanyConfidential10ChillerSelectionCentralPlantOptimizationTM10JohnsonControlsCompanyConfiMetasysAdvancedTechnicalTraining11CentralPlantOptimization10TM(CPO10)ChillerSelectionModelingChillerEfficiencyTypicalConstantSpeedChillerActualdesignefficiencyCPO10approximatedefficiencyLowerOpt%LoadUpperOpt%LoadCOP=CoefficientofPerformanceMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining12CentralPlantOptimization10TM(CPO10)ChillerSelectionTypicalVariableSpeedChillerActualdesignefficiencyCPO10approximatedefficiencyLowerOpt%LoadUpperOpt%LoadModelingChillerEfficiencyNote:Variablespeedchillerstypicallyaremostefficientwhenoperatedatpartload.MetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining13CentralPlantOptimization10TM(CPO10)ChillerSelectionPlantModelEachchillerassignedownPeakCOPAllchillerssharesameLower&UpperOptimal%Load

LowerOpt%LoadUpperOpt%LoadModelingChillerEfficiencyNote:ChillerswithahigherCOPwillalwaysbeselectedoverchillerswithalowerCOP,allotherconditionsbeingequal.MetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining14CentralPlantOptimization10TM(CPO10)ChillerSelectionUnlikeotherCCTapplications,CPOwill

notdoanythinguntilsomeminimumdataisenteredaboutthechillersEdittheChillerSelectorxx(wherexx=numberofchillers)OutputControlmoduleSpecifyingChillerParametersbasedonControlStrategyMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining15CentralPlantOptimization10TM(CPO10)ChillerSelectionControlModeAnyChillerLoad*AnyAnyCWHeadered/DedicatedAnyAnyHeaderedAnyCHWHeadered/DedicatedAnyAnyAnyHeaderedRequiredPropertiesRatedCapacityRatedCurrentRatedCWFlowCWMinFlowRatedCHWFlowCHWMinFlow*AlsorequiredforASHRAEcoolingtowercontrolstrategySpecifyingChillerParametersbasedonControlStrategyMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining16CentralPlantOptimization10TM(CPO10)ChillerSelectionAdditionalDataperChillerMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining17CentralPlantOptimization10TM(CPO10)QuestionsAdditionaldatatoreview:LowerandUpperOptimal%LoadChillerBaseLoadAdditionalDataperChillerMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining18CentralPlantOptimization10TM(CPO10)ChillerSelectionSelectingEfficientChillerCombinationMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining19CentralPlantOptimization10TM(CPO10)ChillerSelectionSelectingEfficientChillerCombinationMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining20CentralPlantOptimization10TM(CPO10)ChillerSelectionStagingMargin分段范圍Hysteresis滯后StagingUpMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining21CentralPlantOptimization10TM(CPO10)ChillerSelectionChillerratedcapacityisbasedon:adesignenteringCWtempandleavingCHWtempThedifferenceofthesevaluesisthechiller’slift.When

actuallift<designlift,theactualchillercapacity>theratedcapacityactuallift>designlift,theactualchillercapacity<theratedcapacityUpperandLowerOptimal%Loadpointsalsoshiftinasactualliftdecreasesfromdesignlift.CPO10takesadvantageofthischaracteristicwhencalculatingwhatcombinationofchillersismostefficient.RequiresmeasuredCWtemperatureandmeasuredCHWtemperaturesorCHWtemperaturesetpointinput.ModifyingChillerCapacitybasedonLiftMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining22CentralPlantOptimization10TM(CPO10)ChillerSelectionChillercapacityincreasesasliftdecreases.UpperandLower%Loadbreakpointsshift(variablespeedchillersonly)CapacityandOptimal%LoadShiftMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining23CentralPlantOptimization10TM(CPO10)ChillerSelectionAdditionalDataperChillerMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining24CentralPlantOptimization10TM(CPO10)ChillerSelection(SpecifyingLower&UpperOptimal%LoadResetRange)MetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining25CentralPlantOptimization10TM(CPO10)ChillerSelection(De-ratingChillercapacity)Chillercapacitycanbede-rated降額(reduced)toforcetheprogramtoreconsiderwhichchillerstooperate.Mayberequiredifchillershavemechanicalissues,suchasfouledtubes,orOAconditionsabovedesignIssue問題commandfromCCTIssuecommandfromhead-end(mustexpose&map“DerateNow”points)Systemwillautomaticallyde-ratechillersifCHWSTempis>3degFabovesetpointformorethan20minutes(useradjustable)MetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining26CentralPlantOptimization10TM(CPO10)ChillerSelectionOptionalinputtoforceCPOtonotstageupTypicalusetopreventstartingadditionalchillerslateinthedayNormallysetbyweeklyscheduleMustmappointtoNAEChillerCoastMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining27CentralPlantOptimization10TM(CPO10)ChillerSelectionChillerswithmoreruntimeornumberofstartswillbepenalized(iftheseoptionsareselected)Chillersthatrequiremorepumpstobestarted(basedonminimum/ratedflows)willbepenalizedChillersthatare“outofservice”willnotbeselectedAdditionalRulesforSelectingChillersMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining28CentralPlantOptimization10TM(CPO10)ChillerSelectionOrderofsequencingcanbedesignatedbyquantityper“type”Runtimeand/ornumberofstartsequalizationwillbeenforcedwithineachtype.AdditionalRulesforSelectingChillersForcingSequencingOrderMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining29CentralPlantOptimization10TM(CPO10)QuestionsChillerSelectorcanrequiresignificantdataaboutthechillers.Quantityofdataisdependenton:controlstrategy,variablevs.constantspeedequipment,pipingarrangements,anddesiretotakeadvantageofselectedfeaturesCPO10hasusabledefaultsformany(butnotall)parametersAjobaidformisindrafttoprovideacentralplacetogatherallrequiredandoptionalinformationWatchforanFYIforavailabilityofthisformJobAidforGatheringDataMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining30CentralPlantOptimization10TM(CPO10)QuestionsMetasysAdvancedTechnicalTraJohnsonControlsCompanyConfidential31PumpControlCentralPlantOptimizationTM10JohnsonControlsCompanyConfiMetasysAdvancedTechnicalTraining32CentralPlantOptimization10TM(CPO10)PumpControlChillerswithDedicatedPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining33CentralPlantOptimization10TM(CPO10)PumpControlCHWand/orCWpumpsarestartedfirst,thenthechillerisenabledfollowingauserdefinedpumpdelayDedicatedPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining34CentralPlantOptimization10TM(CPO10)PumpControlVariableSpeedPumpSupportMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining35CentralPlantOptimization10TM(CPO10)PumpControlMeasureeachchiller’sCWDeltaT.PumpspeedofallpumpswillbecontrolledbythechillerwiththelargestDeltaTtomaintainauserdefinedsetpoint(default10degF).Minimumpumpspeedisuserdefined(80%default)DedicatedVariableSpeedCWPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining36CentralPlantOptimization10TM(CPO10)PumpControlMeasureCHWDeltaP.Pumpspeedofallpumpswillbecontrolledtomaintainauserdefinedsetpoint(Default=10psi)Minimumpumpspeediscalculatedtomaintainminimumchilledwaterflow(usingpumplawsthatflowisdirectlyproportionaltocommandedspeed)DedicatedVariableSpeedCHWPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining37CentralPlantOptimization10TM(CPO10)PumpControlBypassvalveismodulatedtomaintainminimumflowthroughthechillersTotalCHWFlowmustbemeasuredDedicatedVariableSpeedCHWPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining38CentralPlantOptimization10TM(CPO10)PumpControlChillerswithHeaderedPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining39CentralPlantOptimization10TM(CPO10)PumpControlCHWand/orCWisolationvalves(optional)areopenedfirstfortheselectedchillerIsolationvalvescanbeeithertwopositionorproportional,butallmustbethesametypeforeachpumptypeThemostefficientgroupofpumpsneededtosatisfyrequiredCHWand/orCWflowEachpumphasauserassignedcapacityandefficiencyTheminimumandratedCHW/CWflowsoftheselectedchillersareusedtocalculatea“required”flowrateneededtosupporttheselectedchillersThemostefficientsetofpumpsthatsatisfytherequiredflowareturnedonAfterauserspecifieddelay,theselectedchillersareenabledHeaderedPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining40CentralPlantOptimization10TM(CPO10)PumpControlDetailsofdetermining“requiredflow”

RequiredFlowwillbeatleast10%morethanthesumoftheselectedchillersratedflow,adjustedforpredicted%loadoftheselectedchillers. Itisassumedthattherationinwhichtotalflowisdistributedamongthechillersisconstant,therefore: Thissetstheminimumflowasfollows:

(1)(2)(3)HeaderedPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining41CentralPlantOptimization10TM(CPO10)PumpControlPumpspeedismodulatedtomaintaindifferentialpressureacrossthecondensertouserdefinedsetpoint(default=3psi)MeasureCWDeltaPatthesharedcoolingtower–thismustberepresentativeofDeltaPforallchillersMinimumflowismaintainedbasedonminimumflowrequirementsspecifiedforeachactivechillerCWFlowmustbemeasuredHeaderedVariableSpeedCWPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining42CentralPlantOptimization10TM(CPO10)PumpControlDelta-PSetpointResetOptionforCHWPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining43CentralPlantOptimization10TM(CPO10)PumpControlDeltaPressuresetpointofPrimaryCHWpumpscanberesetbybuildingloadDeltaPressureTypicallylocatedneartheendofthebuilding’schilledwaterloopDelta-PSetpointResetOptionforCHWPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining44CentralPlantOptimization10TM(CPO10)PumpControlAlternatively,DeltaPsetpointofPrimaryorSecondaryCHWpumpscanberesetbycoolingcoilvalvepositionsinAHUsorothercoolingloads.SetpointisreducedifnovalvesarefullyopenModuleusesstatisticalanalysistopreventsingle“bad”valvedrivingexcessivereset.Defaultsto4coils.Canmanuallyaddmorebycopy/pastingtheEWMA’sintheLogicViewDelta-PSetpointResetOptionforCHWPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining45CentralPlantOptimization10TM(CPO10)PumpControlForadditionalinformation,refertothefollowingvideofoundhere::9085/publish/controls/us/eng/met5/h/energy_reporting.htmlDelta-PSetpointResetOptionforCHWPumpsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining46CentralPlantOptimization10TM(CPO10)PumpControl(ExampleTimingforAddingaChiller)1653265432MetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining47CentralPlantOptimization10TM(CPO10)QuestionsMetasysAdvancedTechnicalTraJohnsonControlsCompanyConfidential48ChillerStagingOptionsCentralPlantOptimizationTM10JohnsonControlsCompanyConfiMetasysAdvancedTechnicalTraining49CentralPlantOptimization10TM(CPO10)ChillerStagingOptionsCurrent(Capacity)LimitOptionsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining50CentralPlantOptimization10TM(CPO10)ChillerStagingOptionsWhenanewdeviceisadded,capacitylimitstartsat100%,thenrampeddowntothecurrentpercentload.Assumptionisthatthenewchillertakessometimetophysicallyspeedup,sotherunningchillersarerampeddownasthenewchillerrampsup,causingminimumdisruptiontothesystem.CapacityLimitingOptions-AutomaticMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining51CentralPlantOptimization10TM(CPO10)ChillerStagingOptionsWhenanewchillerisadded(includingthefirst)theCapacityLimitOutputissettothe“CapacityLimitUserInput”(defaultvalue60%)forthe“CapacityLimitHoldTime”,thenreleased.Notethatthismightreducetheplant’sabilitytomeetthebuildingloaduntilthenewlyaddedchillercomesuptofullspeed,sothevalueshouldbeevaluatedwithcare.CapacityLimitingOptions–User

Defined*oruserspecifiedvalueMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining52CentralPlantOptimization10TM(CPO10)ChillerStagingOptionsChangetheCapacityLimitHoldTimeifeitherAutomaticorUserDefinedselectionismade–ifthe10mindefaultisnotappropriate.ChangetheChillerCurrentLimitvalueifUserDefinedselectionismade–ifthe60%defaultisnotappropriate.CapacityLimitingOptionsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining53CentralPlantOptimization10TM(CPO10)QuestionsMetasysAdvancedTechnicalTraJohnsonControlsCompanyConfidential54CoolingTowerControlCentralPlantOptimizationTM10JohnsonControlsCompanyConfiMetasysAdvancedTechnicalTraining55CentralPlantOptimization10TM(CPO10)CoolingTowerControlCPOcansequenceandcontrolthefollowingtowerconfigurationsSingleSpeed2-Speed3-SpeedVerniercontrol(1towerw/VFD,allotherssinglespeed)VariablespeedOptionsincludeCommonIsolationvalve(spray)or1pertowerCommonsump(novalve)ordedicatedsumpvalvepertowerBy-passvalveAir-cooledchillers(notowers)ConfigurationsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining56CentralPlantOptimization10TM(CPO10)CoolingTowerControl(ControlStrategies)Bypassvalveonly–RiverorlakewatercoolingProgrammodulatesbypassvalvetomaintainuserdefinedCWsetpointCoolingtoweronly–Hot/humidclimatesProgramsequencestowerfanstomaintainuserdefinedCWsetpointCoolingtower&bypassvalve–CoolerclimatesProgramsequencestowerfansandbypassvalvetomaintainuserdefinedCWsetpointAllisolationvalvesareopenedwheneverthe1stcoolingtowerisneededProgramwillsequentiallystarteachtoweratlowestspeed,thenincreasespeedasneededMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining57CentralPlantOptimization10TM(CPO10)CoolingTowerControlNearOptimalCoolingTowerControlMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining58CentralPlantOptimization10TM(CPO10)CoolingTowerControlOpenloopcontrolofcoolingtowerswherefanspeed(totalairflow)isproportionaltothecoolingloadbeingproducedbythechillerplant.ContrastthistoCPOmethodofclosedloopcontroltomaintainCWtemperaturetoafixedsetpointControlalgorithmscomplywithASHRAEFundamentalsChapter41AlsoknownasBraun-DederrichalgorithmACWtemperaturelowlimitvalue(userdefined)willlimitCWtemperature.AppliestovariablespeedfansonlyAllcoolingtowersareassumedtobecommontothechillerplant(dedicatedtowersperchillernotsupported)Eachtower’sisolationvalveisinterlockedtoeachtower.NearOptimalCoolingTowerControlMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining59CentralPlantOptimization10TM(CPO10)CoolingTowerControlWhenthepartloadratioisgreaterthan25%,Whenthepartloadratioislessthan25%,Where:NearOptimalCoolingTowerControl-DetailsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining60CentralPlantOptimization10TM(CPO10)CoolingTowerControlRatedCapacityissameunitsasCWpumpflow(e.g.,gpm)PeakEfficiencyisrelative–FanswithhigherratedefficiencywillbeselectedfirstNearOptimalCoolingTowerControl–RequiredInputsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining61CentralPlantOptimization10TM(CPO10)QuestionsMetasysAdvancedTechnicalTraJohnsonControlsCompanyConfidential62ControllerSelectionConsiderationsCentralPlantOptimizationTM10JohnsonControlsCompanyConfiMetasysAdvancedTechnicalTraining63CentralPlantOptimization10TM(CPO10)ControllerSelectionConsiderationsCPO10canusealotofFEC/NCEresourcesRe-designedFECx6x1havethemostprocessorpowerNCEhasthemostmemoryOlderFECx6x0hasthelowestprocessingpowerandmemoryPerformanceConsiderationsMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining64CentralPlantOptimization10TM(CPO10)ControllerSelectionConsiderationsUnlikeotherCCTapplications,CPOcanbespreadacrossmultipleFEC/NCEsSplitmustbebydevicetype,e.g.,allchillers,allCHWpumps,etc.Aftersplitismade,youmustconnectvariousnetworkinputs/outputsusingeitherpeer-to-peerorGlobalDataShareobjectsintheNAEFiveseparateplantsubsystems–AnyorallcanbeselectedforasingleNCEorFECSplittingCPOControlAmongMultipleControllersMetasysAdvancedTechnicalTraMetasysAdvancedTechnicalTraining65CentralPlantOptimization10TM(CPO10)ControllerSelectionConsiderationsCPO10ApplicationNoteSearch“CPO”inQuickLitCCTHelp