CoolingSystemTheflowcontrolandshutoffvalve(FCSOV)controlsthequantityofairintotheairconditioningsystem.Anairmixvalveortemperaturecontrolvalve(TCV)【溫度控制活門】dividesairfromtheflowcontrolandshutoffvalveintohotandcoldstreams【n.流；河流】.Thisvalveadjuststheproportion【n.比；比率】ofairthatgoesintooraroundthepack.Theproportionofairthatgoesintothepackcontrolstheairtemperatureintothecabin.TheairmixvalveorTCVispartofthetemperaturecontrolsubsystem.CoolingSystemTheprimaryheatexchanger【初級熱交換器】

receivesbleedairfromtheflowcontrolandshutoffvalve.Asthebleedairgoesthroughtheheatexchanger,ramair【沖擊氣流】

removesheat.Thecooledbleedairgoestothecompressorsectionoftheaircyclemachine.CoolingSystemThesecondaryheatexchanger

receivescompressedairfromtheaircyclemachine.Astheairgoesthroughtheheatexchanger,ramairremovesheat.Afterthecompressedairiscooled,itgoesbacktotheaircyclemachine.CoolingSystemThereisanaircyclemachine(ACM)foreachoftheleftandrightpacksystem.TheACMisathree-wheelairbearing

aircyclemachine.左右組件系統各有一個空氣循環機。該空氣循環機是采用空氣軸承的三輪式空氣循環機。Itdecreasesairtemperaturebyexpansion【n.膨脹；擴大】throughaturbine.Itiscomprisedof

turbine,compressorandfanwhichareconnectedbyacommonshaft.它由通過一根共同的軸連接的渦輪、壓氣機和風扇組成。CoolingSystemTheairbearingslettheACMturnathighspeedwithlittlefriction.Cooledbleedairfromtheprimaryheatexchangerenterstheaircyclemachineandiscompressed.Thecompressedairthengoestoasecondaryheatexchangerandbacktotheaircyclemachine.Moisture【n.水分；濕氣】

canberemovedfromtheairbeforeenteringintotheturbineofACMorafterexpendingfromit,dependingontheaircraftmodel.CoolingSystemTheramairsystem

controlsthequantityofoutsideambientairthatflowsthroughtheheatexchangers.Thewaterseparatorcollectsandremovesmoisturefromtheairbeforeitgoesintothedistributionsystem.Therearetwodifferentwaterseparators:lowpressurewaterseparatorandhighpressurewaterseparator.Theformerisusedon737-600/700andthelatterisusedon737-800/900.Theanti-icesystempreventsthewaterseparator,ACMorcondenser【n.冷凝器；電容器】

fromfreezing.CoolingSystemLowpressurewaterseparatorCoolingSystemThisisbeingusedmorefrequently