Heat exchanger networks retrofit with considering pressure drop by coupling

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1、Energy36(2011)2381e2391ContentslistsavailableatScienceDirectEnergyjournalhomepage:www.elsevier.com/locate/energyHeatexchangernetworksretrofitwithconsideringpressuredropbycouplinggeneticalgorithmwithLP(linearprogramming)andILP(integerlinearprogramming)methodsa,ba,b,*HadiSol

2、tani,SirousShafieiaFacultyofChemicalEngineering,SahandUniversityofTechnology,POBox51335/1996,Tabriz,IranbEnvironmentalEngineeringResearchCenter(EERC),SahandUniversityofTechnology,POBox51335/1996,Tabriz,IranarticleinfoabstractArticlehistory:Thisresearchistryingtodevelopanew

3、procedureforretrofitofHENsincludingpressuredropusingReceived18August2010geneticalgorithm(GA)coupledwithlinearprogramming(LP)andintegerlinearprogramming(ILP)Receivedinrevisedformmethods.TheGAisusedtoproducestructuralmodificationswhereascontinuousvariablesarehandled13December

4、2010usingaconvertedNLPformulationforMaximumEnergyRecovery(MER).TheconvertedNLPconsistsofAccepted12January2011anLPforMERwithaddingasearchlooptofindthebestminimumapproachtemperatureandsplitratiosAvailableonline26February2011whichareeasiertosolve.Topreventcomplexityandensureo

5、ptimumsolution,thepressuredropsofstreamsarecalculatedKeywords:fromtheresultsofLPandthenamodifiedILPproblemissolvedtodeterminethemaximumprofitofHeatexchangernetworks(HENs)RetrofitretrofitofHENs.ThemotivationoftheILPisdecisionmakingforeliminationorreuseofcurrentPressuredropexch

6、angersandpumpsand/orintroducingnewonestothenetwork.ResultsshowthattheproposedGeneticalgorithm(GA)methodoftenfindsbettersolutionsthanthosereportedintheliterature.Linearprogramming(LP)CrownCopyrightÓ2011PublishedbyElsevierLtd.Allrightsreserved.Integerlinearprogramming(ILP)1.

7、Introductionstepapproachinwhichthefirststepwasamixedintegerlinearprogramming(MILP)prescreeningfordeterminationoftheThestudyofretrofitproceduresforheatexchangernetworkseconomicfeasibilityoftheretrofitprojectandamixedintegerhasbeensubjectofnumerousresearchworks,duetothelargeno

8、nlinearprogramming(MINLP)formulationwasthenappliedtosavingsthatcanbeachievedinutilityandalsoelec