制冷剂与冷冻机油互溶性的理论与实验分析

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1、AbstractWithmanycountriesintheworldpayingcloseattentiontoclimateproblems,somerefrigerantswithhighozonedepletionpotentialandglobalwarmingpotentialaregraduallyeliminatedfromtherefrigerationtrade.Themiscibilityofrefrigerantswithrefrigerationoilshaslargeinfluenceontheworkinge

2、ffectoftherefrigerationsystem.Therefore,itisnecessarytostudytherefrigerantsmiscibilitywithoilsbybothexperimentalandtheoreticalmethodsinordertogeneralizetheuseofenvironmental-friendlyrefrigerants.Thesolubilitylinesofrefrigerantswithrefrigerationoilsaresimulatedbycubicequat

3、ionofstateandactivityindexmethodsinthisthesis.Thencriticalsolubilitytemperaturelinesarepredictedonthebasisofsimulativesolubilitylines.Throughcomparativeanalysisofthemiscibilitydifferenceamongmanyrefrigerants,anewmethodcombiningthesolubilityparameterandempiricalformulameth

4、odsisproposed.Thisnewevaluationmethodisappliedtoevaluatethemiscibilitydegreeof18purerefrigerantswiththemineraloil.Theresultshowsthatthismethodhasmeritsofbothsolubilityparameterandempiricalformulamethods,whichadaptstomorekindsofrefrigerantsthanempiricalformulamethodandismo

5、reaccuratethansolubilityparametermethod.Anexperimentalapparatusfortestingthemiscibilityofrefrigerantswithlubricantsisestablishedbasedonrelativestandards.Themiscibilityofsomepurerefrigerantswithoilsistested.Innearly15%oilrate,RE170/R227eawithamineraloil,RE170/R1234ze(E)wit

6、hamineraloilarealsotested.TheexperimentalresultsshowthatCF3I,RE170,R161havegoodmiscibilitywiththemineraloil;R134a,R227ea,R152aalsohavegoodmiscibilitywithPOEoils.WhenthemassfractionofR227eainRE170+R227eablendsvariesfrom38%to55%,thecriticalsolubilitytemperaturehasarapidincr

7、ease.IntheRE170+R227eaandmineraloilrefrigerationsystem,themassfractionofR227eainthebinarymixtureshouldnotexceed50%inordertoavoidblockingpipelinesordecreasingcoefficientofperformance.WhenthemassfractionofR1234ze(E)inthemixtureofRE170+R1234ze(E)variesfrom31%to70%,thecritica

8、lsolubilitytemperaturehasarapidincrease.OncetherateofR1234ze(E)exceeds70%,largeflocsmayappeareve