换热器设计外文翻译原稿(8)

Accordingtotheentransydissipationtheory,theentransydissipationcanbeusedtodescribetheirreversibilitiesinducedbyheatconductionand uidfriction,whilesuchirreversibilitiesarethemainfactorstodeterioratetheperformanceofheatexchanger.Therefore,inthepresentwork,basedontheentransydissipationtheoryandgeneticalgorithm,twooptimizationapproachesforheatexchangerdesignareproposed.Firstly,asingle-objectiveoptimizationapproachisformulated,wherethetotalentransydissipationnumberistakenastheobjectivefunction.Whentheheatloadis xed,thesingle-objectiveoptimizationdesigncansigni cantlyimprovetheperformanceofheatexchanger.However,forthe xedheattransferareacase,theimprovementofexchangereffectivenessthroughtheoptimizationprocessisattheexpenseoftheincreaseofthepumpingpower.Inordertoaddressthisproblem,themulti-objectiveoptimizationdesignofheatexchangerisestablished,wheretheentransydissipationnumbersrelatedtoheatconductionand uidfriction,respectively,aretakenastwoseparateobjectives.Incomparisonwiththesingle-objectiveoptimizationapproach,themulti-objectiveoptimiza-tiondesignofheatexchangercanachievethesameexchangereffectivenesswithlessconsumptionofpumpingpower.Further-more,themulti-objectiveoptimizationleadstothenon-uniqueoptimalsolutionswhichprovidemore exibilityfortheheatexchangerdesign.Acknowledgements

TheSupportofourresearchprogrambyNationalBasicResearchProgramofChina(ProjectNo.2007CB206900)isgreatlyappreciated.

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