ASHRAE.4448-2001 Theoretical Performance Comparison of CO2 Transcritical

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1、4448TheoreticalPerformanceComparisonofCO2TranscriticalCycleTechnologyVersusHCFC-22TechnologyforaMilitaryPackagedAirConditionerApplicationDouglasM.Robinson,Ph.D.EckhardA.Groll,Ph.D.MemberASHRAETheworld-wideagreementtorestricttheuseofchlorofluorocarbons(CFCs)andhydrofl

2、uoro-carbonshaspromptedresearchintothepossibilitiesofreplacementrefrigerants,particularlythoseoccurringnaturallyintheenvironment.Onesuchnaturalrefrigerant,carbondioxide,hasbeenconsideredforcertainrefrigerationandairconditioningapplications.Inordertoevaluatethepotenti

3、alperformanceofarefrigerationcyclebasedoncarbondioxide,acyclemodelhasbeendevelopedwhichcansimulatetheoperationofacarbondioxidebasedrefrigerator/airconditioner.ThismodeliscalledACCO2andaccountsfortherealisticeffectsofthethermo-physicalpropertiesofcarbondioxide.Themode

4、lsimulatestheoperationofacarbondioxidebasedairconditionerthatusesairastheheatsourceandheatsink.AparametricstudyhasbeenconductedusingACCO2aswellasavalidatedcyclemodelwhichsimulatestheoperationofanHCFC-22basedpackagedaircondi-tionerdesignedforusebytheU.S.Armyinacombate

5、nvironment.Thesizeandweightcon-straintsofthisapplicationrenderHCFC-22basedunitslessefficientthantypicalHCFC-22unitaryairconditionersofthesamecapacity.Itishypothesizedthatthesesameconstraintswillnotaffecttheperformanceofacarbondioxidebasedpackagedairconditionerassever

6、ely.Theevaporativecapacity,compressorpower,andCOPwerecalculatedforeachcycleoverarangeofindoorandoutdoortemperatures,andusedasabasisforcomparingthetwocycles.INTRODUCTIONRegulationsprohibitingtheuseofchlorofluorocarbons(CFCs)asrefrigerantsbyindustrial-izednationsarecur

7、rentlyineffect,andguidelinesforphasingouthydrochlorofluorocarbons(HCFCs)asrefrigerantsinthefuturehavealreadybeenagreeduponbymanynations.Thishaspromptedresearchersworldwidetoinvestigatethefeasibilityofnewlydevelopedornaturalrefrigerantsinconventionalornovelrefrigerati

8、oncycles.However,thedevelopmentofnew,chemicallymanufacturedfluidstobeusedasrefrigerantsmayresultinthesamedilemmatheworldcurrentlyfa