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时间:2020-04-24
《低温室效应工质空调蒸发器性能模拟计算-论文.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第50卷第12期机械工程学报Vl01.50NO.1220l4年6月JOURNALOFMECHANICALENGINEERINGJun.2O14DoI:l0.3901/JME.2014.12.133低温室效应工质空调蒸发器性能模拟计算术韩广明李敏霞马一太(天津大学中低温热能高效利用教育部重点实验室天津300072)摘要:建立翅片管式蒸发器的稳态分布参数数学模型,考虑蒸发器内部的实际流动状态,用VisualBasic计算机语言编写翅片管式蒸发器模拟计算程序,利用R22的计算结果与文献试验结果进行验证,得到较好的一致性。基于此模型模拟低温室效应(Globa
2、lwarmingpotential,GWP)q-质R290、HFO1234yf和HFO1234ze在翅片管式蒸发器内的流动换热特性。分析改变迎面风速、制冷剂质量流量以及管外径尺寸时换热量和压降的变化情况,并与现在广泛使用的R410A进行性能的对比分析。结果表明,风速稳定时R290换热量最大,HFO1234yf最小;相同情况下,HFO1234yf与HFO1234ze最容易达到过热状态;压降相同时,R410A的质量流量最大,R290的最小;换热量相同时,HFO1234yf的质量流量最大,R290的最小。为低GWP工质翅片管式蒸发器的优化设计和系统匹配以及
3、制冷剂的替代提供理论基础。关键词:翅片管式蒸发器;仿真计算;低温室效应工质中图分类号:TB657SimulationandCalculationforthePerformanceofanAir-conditioningEvaporatorwithLowGlobalWarmingPotentialWorkingFluidsHANGuangmingLIMinxiaMAYitai(KeyLaboratoryofMedium—LowTemperatureEnergyEficientUtilizationofMinistryofEducation,Tianji
4、nUniversity,Tianjin300072)Abstract:AdistributedparametermathematicalmodeliSsetupforafinnedtubeevaDoratorundersteadystate,theactualflowconditioniStakenintoconsiderationinsidetheevaporatorinthismode1.SimulationprogramofthefinnedtubeevaporatoriswrittenwithVBlanguage.Comparisonsare
5、alsoconductedbetweensimulationresultsanddatafromexperimentintheliterature.theresultsshowthatthemodelhasagoodconsistency.Basedonthismode1.thecharacteristicsoftheflowandheattransferoflOWglobalwarmingpotential(GWP)workingfluidsR290.HFO1234yfandHFO1234zeinthefinedtubeevaporatorares
6、imulated.Whenthehead—onwindspeed,massflowrateandpipediametersizearealtered,thechangesituationofheatexchangecapacityandpressuredropareanalyzedandtheperformancecomparisonsbetweentheabovelOWGWPrefrigerantsandtheR410Awhicharenowwidelyusedarecaredout.TheresultsshowthattheR290hastheb
7、iggestheatexchangecapacityandtheHF01234yfhasthesmallestundersteadYwindspeed;HFO1234yfandHFO1234zereachsuperheatstatemosteasilyinthesamecase.Ⅵenthepressuredropsaresame,themassflOWrateofR410AiSthemaximumandtheR290istheminimum.Ⅵentheheatexchangecapacityissame.themassflowrateofHFO1
8、234yfismorethanothersandtheR290issmallerthantheothers.
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