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1、Optimaldesignofshell-and-tubeheatexchangersusinggeneticalgorithmsJ.M.Ponce1,M.Serna1,V.Rico2andA.Jiménez21FacultaddeIngenieríaQuímica-UniversidadMichoacanadeSanNicolásdeHidalgo.Morelia,Michoacán,México2DepartamentodeIngenieríaQuímica-InstitutoTecnológicodeCel
2、aya,Celaya,Guanajuato,México.AbstractThispaperpresentsanapproachbasedongeneticalgorithmsfortheoptimaldesignofshell-and-tubeheatexchangers.TheproposedapproachusesacompactformulationoftheBell-Delawaremethodtodescribetheshell-sideflowpattern.Theoptimizationproce
3、dureinvolvesthedeterminationofsuitablevaluesofmajorgeometricparameterssuchasthenumberoftubespasses,standardinternalandexternaltubediameters,tubelayoutandpitch,typeofhead,fluidallocation,numberofsealingstrips,inletandoutletbafflespacing,andshell-sideandtube-si
4、depressuredrops.Theproposedmethodologytakesintoaccountseveralgeometricandoperationalconstraintstypicallyrecommendedbydesigncodes,andmayprovideglobaloptimumsolutionsasopposedtolocaloptimumsolutionsthataretypicallyobtainedwithmanyotheroptimizationmethods.Anexam
5、plepreviouslysolvedwithadisjunctiveprogrammingmethodisusedtoshowtheapplicationoftheproposedapproach.Theresultsshowhowthepreviousdesignwassignificantlyimprovedthroughtheuseoftheoptimizationapproachbasedongeneticalgorithms.Keywords:heatexchanger,shellandtube,Be
6、ll-Delaware,geneticalgorithms.1.IntroductionShellandtubeheatexchangersarewidelyusedinmanyindustrialpowergenerationunits,chemical,petrochemical,andpetroleumindustries.Thesetypesofheatexchangersarerobustunitsthatworkforwiderangesofpressures,flowsandtemperatures
7、(Taborek,1983).Atypicaloptimizationproblemforheatexchangersconsistsoffindingaunitthatmeetsagivenheatdutyattheminimumtotalannualcost,subjecttoagivensetofconstraints.Thetotalannualcostshouldincludetheannualizedcapitalcostoftheexchangerplustwopumpingdevices(onef
8、orthetube-sidefluidandanotheroneforthesell-sidefluid),andtheoperating(power)costsofsuchpumps.Thetraditionaldesignalgorithmforshellandtubeheatexchangerconsistsofratingalargenumberofdiffere