毕业论文（设计）船舶余热驱动有机朗肯循环的工质优选

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1、船舶余热驱动有机朗肯循环的工质优选摘要：分析了不同优化目标函数下的有机朗肖循环系统参数和性能，采用多评价指标对工质进行优选。研究结果表明，系统的热效率随着熬发温度的升高先増大再减小，在一定膨胀比下，系统冇最佳熬发温度；工质的选择会极大地影响评价系统成木的经济性目标函数，不同工质的最优经济性目标函数值最大相差3.5倍；以综合评价函数F为优化目标分析系统参数和性能更加全而，得出的最佳冷凝温度要小于以1/obj为优化目标的最佳冷凝温度；以cyclohexane>R113和R141b为工质时系统冇较优的经济性能和综合性能,多评价指标综合分析，R141b是最优的工质。关键词：有机朗肯

2、循环；有机工质；经济性能；效率；参数优化WorkingFluidsOptimizationforOrganicRankineCycleSystemofWasteHeatRecoveryFromShipDieselEngineZhuYilin1,LiWciyi1,SunGuanzhong",TangQiang3,GaoJing1,XuWcnhua1,CaoChunhui1(l.KeyLaboratoryLow-grateEnergyUtilizationTechnologiesandSystems,MinistryofEducation(TianjinUniversity),

3、Tianjin300350;2.KeyLaboratoryofRegionalEnergySystemOptimization,MinistryofEducation(NorthChinaElectricPowerUniversity^Beijing102206;3.KeyLaboratoryofLow-gradeEnergyUtilizationTechnologiesandSystems,MinistryofEducation(ChongqingUniversity),Chongqing400030)Abstract:Thesystemparametersandperf

4、ormanceoforganicRankinccycle(ORC)wereanalyzedbyusingdifterentoptimizationobjectivefunctions.TheworkingfluidswereselectedforORCsystemwithmulti-objectiveevaluation.Theresultsshowthatthethermalefficiencyincreaseswiththeevaporationtemperaturerisingandthendecreases・Thereistheoptimalevaporationt

5、emperatureunderthecertainexpansionrationinthesystem.Thechoiceofworkingfluidswouldgreatlyaftecttheeconomicobjectivemeasuringthesysteminvestment.Thegapofthehighesteconomicobjectivevaluesofdifferentworkingfluidsisupto3.5times.Themorecomprehensiveanalysisofsystemperformanceandparameterswouldbe

6、acquiredwiththeFofcomprehensiveevaluationfiinctionastheoptimizationobjective.Itcancoordinatetherelationshipofdifferentcriteriaandbebetterforsystemeconomythanasinglescreencriterion.TheoptimumcondensationtemperaturebyusingtheFastheoptimizationobjectiveislessthanthatwiththe1/objofeconomicobje

7、ctivefunctionastheoptimizationobjective.ThesystemhasabettereconomicandcomprehensiveperformancewithcyclohexaneandR113andR141basworkingfluids.TheR141bistheoptimalworkingfluidfortheORCsystemofwasteheatrecoveryfromshipdieselenginewiththecomprehensiveanalysisofmult