air conding system presentation

AIRCONDITIONINGSystemPresentation1/40MENUMENUAIRCONDITIONINGSystemPresentation2/40MENULikethemajorityofthesystemsontheA320theAirConditioningsystemisfullyautomatic,andisdesignedtoprovideacomfortableatmosphereinwhichtoworkandtravel.Wewillbeginourstudyofthesystembyfirstlookingattheairconditioningpacks.MENUAIRCONDITIONINGSystemPresentation3/40MENUTheA320isequippedwithtwoAirConditioningPackslocatedinthewingrootareaforwardoftheLandingGearBay.Let’slookathowapackworks.MENUAIRCONDITIONINGSystemPresentation4/40MENUHOTBLEEDAIRPackFlowControlValveHotbleedairentersthepackviaaPackFlowControlValve.Thepurposeofthisvalveistoadjusttheflowratethroughthepack.MENUAIRCONDITIONINGSystemPresentation5/40MENUCoolConditionedAirTheairthenpassesthroughseveralstageswithinthepackthatprogressivelycooltheairtoprovideaConditionedAiroutput.Infactsubzerotemperaturescanbeachieved.HOTBLEEDAIRMENUAIRCONDITIONINGSystemPresentation6/40MENUCoolConditionedAirTwoofthestagesareheatexchangersthatuseaflowofambientairoverthemtocoolthehotbleedair.Thisflowofairentersviaapackinletscoopandexitsviaanoutletduct.HOTBLEEDAIRPackInletScoopOutletDuctMENUAIRCONDITIONINGSystemPresentation7/40MENUByPassValveHOTBLEEDAIRSothattheoutputtemperatureofthepackcanbeadjustedaby-passvalveisfitted.Thisvalveallowswarmerairtobemixedwiththecoldair.MENUAIRCONDITIONINGSystemPresentation8/40MENUByPassValvePackFlowControlValveThePackFlowControlValve,andtheBy-passvalve,areregulatedbyaPackControllertovarytheflowrateandtemperatureoutput.PackControllerMENUAIRCONDITIONINGSystemPresentation9/40MENUThePackControlleralsocontrolstheinletscoopandoutletducttovarytheamountofairpassingovertheheatexchangers.Note:Toavoidingestionofforeignmattertheinletscoopandoutletductclosetemporarilyduringtakeoffandlanding.PackInletScoopOutletDuctPackControllerMENUAIRCONDITIONINGSystemPresentation10/40MENUTomakethingssimplerlet’sdefinetheareawithintheyellowboxasapack.AirConditioningPackMENUAIRCONDITIONINGSystemPresentation11/40MENUPack1Pack2AirConditioningPacksCoolConditionedAirThetwoAirConditioningPacksoperateautomaticallyandindependentlytoprovidecoolconditionedair.HOTBLEEDAIRMENUAIRCONDITIONINGSystemPresentation12/40MENUMixingUnitPack1Pack2TheConditionedAirfromthepacksisthenfedtoaMixingUnit.MENUAIRCONDITIONINGSystemPresentation13/40MENURamAirMIXINGUNITPack1Pack2RamAirValveIncaseoffailureofbothpacksRamAirisprovidedviaaRamAirValve.WewilllookattheuseofRAMAIRintheAbnormaloperationmodule.MENUAIRCONDITIONINGSystemPresentation14/40MENUoC5oC15PACKOUTLETTEMPPACKOUTLETTEMPBYPASSVALVEPOSITIONBYPASSVALVEPOSITIONoC120oC115COMPRESSOROUTLETTEMPCOMPRESSOROUTLETTEMPPACKFLOWPACKFLOWRamAirMIXINGUNITPack1Pack2•Packflow•CompressorOutletTemperature•BypassValvePosition•PackOutlettemperatureVariouspackparametersaremonitoredbyECAM.Theyare;MENUAIRCONDITIONINGSystemPresentation15/40MENUoC5oC15PACKOUTLETTEMPPACKOUTLETTEMPBYPASSVALVEPOSITIONBYPASSVALVEPOSITIONoC120oC115COMPRESSOROUTLETTEMPCOMPRESSOROUTLETTEMPPACKFLOWPACKFLOWRamAirMIXINGUNITPack1Pack2AIRCONDITIONINGSystemPresentation16/40MENU[][][][][][][][]Theseparameters,alongwiththevalvepositions,aredisplayedontheupperpartoftheECAMBLEEDpage.MENUAIRCONDITIONINGSystemPresentation17/40MENUECAMBLEEDPageHavingdiscussedtheAirConditioningPackswewillnowlookathowtemperatureandflowregulationisachievedthroughouttheaircraft.MENUAIRCONDITIONINGSystemPresentation18/40MENUThreeTemperatureZonesMixingUnitThethreeoutputsfromthemixingunitfeedthreeseparateaircraftZones,Cockpit,ForwardCabin,andAftCabin.Let’slookathowthetemperatureofthezonesismanaged.Pack1Pack2MENUAIRCONDITIONINGSystemPresentation19/40MENUMixingUnitAZoneControlComputermonitorsthetemperaturesofthethreezonesandsendssignalstothePackControllerstosettheairtemperaturedeliveredbythepacks.Pack1Pack2PackControllerPackControllerZoneControlComputerMENUAIRCONDITIONINGSystemPresentation20/40MENUMixingUnitNormallycoldairisdeliveredbythepacksandisthensenttothethreezones.Pack1Pack2ColdAirMENUAIRCONDITIONINGSystemPresentation21/40MENUHotBleedAirHOTAIRTrimAirValvesMixingUnitSincethedifferentareasoftheaircraftmayrequiredifferentamountsofcooling,orheating,hotbleedaircanbeaddedviaTrimAirValvestoachievethedemandedtemperatureforazone.Pack1Pack2MENUAIRCONDITIONINGSystemPresentation22/40MENUHotBleedAirHOTAIRMixingUnitPack1Pack2AIRCONDITIONINGSystemPresentation23/40MENUHotBleedAirHOTAIRMixingUnitPack1Pack2AIRCONDITIONINGSystemPresentation24/40MENUIntheexampleshown:•nohotairisbeingaddedtotheCockpitzone.•somehotairisbeingaddedtotheForwardCabinzone,•alotofhotairisbeingaddedtotheAftCabinzone.HotBleedAirHOTAIRMixingUnitPack1Pack2MENUAIRCONDITIONINGSystemPresentation25/40MENUHotAirValveTheTrimAirValvesaresuppliedviaaHotAirValve.Thepurposeofthisvalveistoregulatethepressureofthehotairsuppliedtothetrimsystemandtoactasashutoff.HotBleedAirHOTAIRMixingUnitPack1Pack2MENUAIRCONDITIONINGSystemPresentation26/40MENUTheHotBleedAirissuppliedtotheHotAirValvefromjustdownstreamofthePackFlowValves.ThismeansthatifthePackFlowValvesareclosedthereisnoairsuppliedtotheTrimsystem.TheHotAirValveandt