ASHRAE Handbook98.R44stxt COMPONENT BALANCING IN REFRIGERATION SYSTEMS

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1、CHAPTER44COMPONENTBALANCINGINREFRIGERATIONSYSTEMSRefrigerationSystem....................................................................................................................44.1Components................................................................................................

2、..................................44.1SelectingDesignBalancePoints.................................................................................................44.2EnergyandMassBalances..........................................................................................................

3、44.2SystemPerformance.....................................................................................................................44.4THISchapterdescribesthemethodsandcomponentsusedinGenerally,thesmallestdifferentialbetweenthesaturatedevapo-balancingaprimaryrefrigerationsystem.Arefrige

4、rantisaratorandthesaturatedcondensingtemperaturesresultsinthelowestfluidusedforheattransferinarefrigerationsystem.Thefluidenergyrequirementforcompression.Liquidrefrigerantcoolingorabsorbsheatatalowtemperatureandpressureandtransfersheatatsubcoolingshouldbeusedwherepossibletoimproveefficienciesa

5、highertemperatureandpressure.Theheattransferprocesscanandminimizeenergyconsumption.Liquidrefrigerantcoolingorinvolveeitheracompleteorpartialchangeofstateinthecaseofasubcoolingshouldbeusedtominimizeenergyconsumption.primaryrefrigerant.EnergytransferisafunctionoftheheattransferWhereintermediatep

6、ressureshavenotbeenspecificallysetforthecoefficients;thetemperaturedifferences;andtheamount,type,andsystemoperation,thecompressorsautomaticallybalanceattheirconfigurationoftheheattransfersurfaceand,hence,theheatfluxrespectivesuctionanddischargepressuresasafunctionoftheirrel-oneithersideofthehe

7、attransferdevice.ativedisplacementsandcompressionefficienciesdependingontheloadandtemperaturerequirements.ThischaptercoversthetechniqueREFRIGERATIONSYSTEMusedtodeterminethebalancepointsforatypicalbrinechiller,butthetheorycanbeexpandedto