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1、浙江海洋学院毕业设计RefrigerationSystemPerformanceusingLiquid-SuctionHeatExchangersS.A.Klein,D.T.Reindl,andK.BroWnellCollegeofEngineeringUniversityofWisconsin-MadisonAbstractHeattransferdevicesareprovidedinmanyrefrigerationsystemstoexchangeenergybetWeenthecoolgaseousref
2、rigerantleavingtheevaporatorandWarmliquidrefrigerantexitingthecondenser.Theseliquid-suctionorsuction-lineheatexchangerscan,insomecases,yieldimprovedsystemperformanceWhileinothercasestheydegradesystemperformance.Althoughpreviousresearchershaveinvestigatedperfor
3、manceofliquid-suctionheatexchangers,thisstudycanbedistinguishedfromthepreviousstudiesinthreeWays.First,thispaperidentifiesaneWdimensionlessgrouptocorrelateperformanceimpactsattributabletoliquid-suctionheatexchangers.Second,thepaperextendspreviousanalysestoincl
4、udeneWrefrigerants.Third,theanalysisincludestheimpactofpressuredropsthroughtheliquid-suctionheatexchangeronsystemperformance.ItisshoWnthatrelianceonsimplifiedanalysistechniquescanleadtoinaccurateconclusionsregardingtheimpactofliquid-suctionheatexchangersonrefr
5、igerationsystemperformance.Fromdetailedanalyses,itcanbeconcludedthatliquid-suctionheatexchangersthathaveaminimalpressurelossontheloWpressuresideareusefulforsystemsusingR507A,R134a,R12,R404A,R290,R407C,R600,andR410A.Theliquid-suctionheatexchangerisdetrimentalto
6、systemperformanceinsystemsusingR22,R32,andR717.IntroductionLiquid-suctionheatexchangersarecommonlyinstalledinrefrigerationsystemsWiththeintentofensuringpropersystemoperationandincreasingsystemperformance.Specifically,ASHRAE(1998)statesthatliquid-suctionheatexc
7、hangersareeffectivein:1)increasingthesystemperformance2)subcoolingliquidrefrigeranttopreventflashgasformationatinletstoexpansiondevices3)fullyevaporatinganyresidualliquidthatmayremainintheliquid-suctionpriortoreachingthecompressor(s)13浙江海洋学院毕业设计Figure1illustra
8、tesasimpledirect-expansionvaporcompressionrefrigerationsystemutilizingaliquid-suctionheatexchanger.Inthisconfiguration,hightemperatureliquidleavingtheheatrejectiondevice(anevaporat
