中央空调冷冻主机程序编程.pdf

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1、CCT–ChillerPlantProgrammingLeoYipTopics•Chillercontrolcomponent•BasicChillerSequencing–Conditionforadd/downchiller–Chillerstart/stopsequencing–Conditionforequipmentselection–EquipmentTrip/Faulthandling•CCTProgrammingControlComponent&Signal1.MainHeaterTemperature,Auto/Flowrateforbuildingload

2、ManualcalculationFaultAlarm2.Chillerflowswitch&isolationRunningvalveforchillermonitoringStatus3.BypassvalvecontrolforsystemStart/StopControlprotection4.Chiller&Pumpcontrol&monitoringChillerStartUpSequencing1.ChillerPlantStartUp(Nochillerisrunning)1.OpenValve22.Startpumpifvalvestatusis1open3

3、.Startchillerifflowswitchis3activatedChillerStartUpSequencing2.AddChiller(Atleast1chillerisrunning)11.OpenValve&Startpump12.Startchillerifflowswitchisactivated2ChillerShutDownSequencing1.ShutDownChiller(Atleast2chillersisrunning)21.StopChiller22.Afteratimedelay,stoppump&valve1ChillerShutDow

4、nSequencing1.ShutDownChillerPlant(Open1Chillerisrunning)21.StopChiller32.Afteratimedelay,stoppump13.Afteratimedelay,closethevalve.ConditionforUpChiller1.Returnwatertemperature(>12DegC)OR2.BuildingLoad=mC∆T(l/sx4.2x∆T)m=waterflowratec=waterdensity∆T=diff.temperatureofsupply&returnConditionfo

5、rDownChiller1.Returnwatertemperature(<12DegC)AND2.BuildingLoad=mC∆T(l/sx4.2x∆T)m=waterflowratec=waterdensity∆T=diff.temperatureofsupply&returnBuildingLoadSetPointUpSetPoint=90%xFullCapacityofRunningChillerDownSetPoint=50%xFullCapacityofRunningChillerConditionforEquipmentSelection•Notmanualm

6、ode,trip•Selectbyrunningtime–Startfirstwithlowesttotalrunninghours–StopfirstwithhighesttotalrunninghoursEquipmentTrip/FaultHandling•Ifequipmentistriporfaulttostart,startanotheravailableequipmentwithlowesttotalrunninghours.ProgramArchitecture-Outputhowmanydeviceneedtostart-Checkwhichequipmen

7、tisavailableornot-Selectthenextstart/stopequipmentbyequipmentrunningtime-Checkavailableofequipment-Startprocedureofequipment-CountthetotalrunninghourCCT-SequencerProactiveInternaltimer,bettersettoValueofUp&zeroDownCCT–ChillerModuleChiller&valvestartcomma