简介:ThispaperreportsthePVTxpropertiesofR22/R152asystemintherangesoftemperaturefrom298.15Kto353.15Kandpressurefrom0.288MPato1.288MPa,SixtysevenPVTxmeasurementsforthreecompositions,i.e.0.2712,0.4094and0.7911molefractionofR22,havebeenmeasuredalong16isotherms.Theuncertaintiesoftemperatureandpressuremeasurementsarelessthan0.01Kand±500Parespectively.ThereliabilityoftheexperimentalmeasurementsisconfirmedbyusingREFPROPprogram,acomputerprogramsuggestedbyMorrisonetal^[4].
简介:CharacteristicsofR22anditsnewalternativerefrigerantR290flowingthroughadiabaticcapillarytubesareinvestigatedbasedonthehomogeneousmodel.Extensiveflowvariablesalongtubelengthsuchaspressure,temperature,viscosity,velocity,Reynoldsnumber,frictionfactorandvaporqualityetcarecomparedbetweenthetwofluidsunderthesameoperatingcondition.Twocasesareconsidered,namely,eitherthesametubelengthorthesamemassflowrateasinletcondition.TheresultsshowthatthemassflowrateinthecapillarytubeofR290is40%lowerthanthatofR22duetothedifferencesofphysicalpropertiesbetweenthetwofluids.Further,aparametricanalysisisperformedanditappearsthateffectsofgeometricandthermodynamicparametersonmassflowrateofR290areweakerthanthatofR22.Whenthecondensingtemperatureisincreasedfrom40℃to50℃,themassflowrateforR22isincreasedby16%,whiletheincreasingrateforR290is13%.
简介:涟漪纹管是一种新型三维内外表面强化传热管,内径11.5000mm、外径12.7000mm,管壁表面有直径为3.5000mm的半球凹坑与高度为0.1778mm的涟漪花纹。工质R22在涟漪纹管内的质量流量设定为40~90kg/h,实验结果表明,涟漪纹管内对流传热努赛尔数(Nu)是相同雷诺数(Re)下光管的2.48倍。同时,对具有不同表面参数(凹坑直径0.0000到4.0000mm,花纹高度0.0000到0.2778mm)的涟漪纹管内湍流传热进行了数值模拟,结果显示,在所研究的范围内,管壁表面凹坑直径越大,Nu越大;花纹虽有助于提高传热效果,但花纹高度越大,Nu越小;而摩擦阻力随着凹坑直径与花纹高度的增大而增大。如果以基于相同泵功的强化因子η’评价其综合强化传热性能,则当凹坑直径为1.0000mm且无花纹存在时,管内的强化传热效果最好。
简介:AhomogeneoustheoreticalmodelisdevelopedtopredicttheperformanceofR22andR290inadiabaticcapillarytubes.Themodelisbasedonconservationequationsofmass,momentumandenergy.Metastablebothliquidandtwo-phaseflowregionsareconsideredinthemodel.Inmetastabletwo-phaseregion,superheatedliquidisintroducedintothemetastablemixtureviscosityandtwomethodsarepresentedtoevaluateit.Themodelisvalidatedbycomparingthepredictedpressureandtemperatureprofileandmassflowratewithseveralinvestigators′experimentaldataofR22andoneofitsalternativesR290reportedinliterature.Allofthepredictedmassflowratesarewithin±8%ofmeasuredvalues.Comparisonsarealsomadebetweenthepresentmodelandotherinvestigators′modelsorsizingcorrelation.Themodelcanbeusedfordesignorsimulationcalculationofadiabaticcapillarytubes.
简介:摘要本文通过一工程实例介绍了大型氟利昂集中制冷系统的设计、安装、调试,并就相关技术问题进行分析探讨,为今后大型氟利昂集中制冷系统的设计及研究提供很好的参考。