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1、I'iuTrERWORHInt.J.Refrig.Vol.18,No.4,pp.253257,1995Copyright(C~1995ElsevierScienceLtdandIIR0140-7007(95)00007-0PrintedinGreatBritain.Allrightsreserved0140-7007/95/$10.00+0.00Centrifugalchillers:thermodynamicmodellingandadiagnosticcasestudyJ.M.Gordon*,Ki
2、mChoonNgandHuiTongChuaDepartmentofMechanicalandProductionEngineering,NationalUniversityofSingapore,10KentRidgeCrescent,Singapore0511Received24May1994;revised28December1994Thediagnosticcapabilityofasimplethermodynamicmodelforchillerperformanceisillustrat
3、edbyacasestudyforacommercial,installedcentrifugalchiller.Performancedataweremeasuredbothpriorto,andsubsequentto,chillermaintenancethatimprovedchillerefficiency.Usingtheseexperimentalmeasurements,weshowthatthesimplethermodynamicmodel,originallydevelopedf
4、orreciprocatingandabsorptionchillers,(1)succeedsinpredictingthefundamentalrelationbetweencoefficientofperformanceandcoolingrateforthecentrifugalchiller,and(2)permitsacleardiagnosticanalysisofheatexchangerfoulingonchillerperformance.(Keywords:centrifugal
5、chiller;chillerperformance;coolingcapacity;irreversibilities;thermodynamicmodel)Refroidisseursd'eaugroupcentrifuge:simulationthermodynamiqueet6tuded'uncasdefigureOndbmontre,parlebiaisd'unebtudedecasd'unrefroidisseurcentrifuyecommercial,dbjhinstallb,lesp
6、ossibilitbsd'unmodHethermodynamiquesimplepourl'kvaluationdesperformancesdesrefroidisseurs.Onamesurblesdonnbesdeperformanceavantetaprbsuneopbrationd'entretienquiaam~lior~lerendementdurefroidisseur.Avecl'appuidecesmesuresexp~rimentales,nousmontronsquelemo
7、dOlethermodvnamiquesimple,misaupoint,hI'origine,pourlesrefroidisseurshpistonethabsorption,permet,d'unepart,deprbvoirlarelationfondamentaleentrelecoefficientdeperformanceetlapuissancefrigorifiquepourlerefroidisseurcentrifugeet,d'autrepart,d'effectuerundi
8、agnosticclairdel'effetdeI'encrassementdes~changeursdechaleursurlaperformancedurefroidisseur.Recently,asimple,analytical,universalapproachwasabsorptionchillersemphasizedthepredictivepowerofproposedforthethermodynamicmodellingofchi
