基于遺傳算法的換熱器多目標優(yōu)化設計方法.pdf

1、華北電力大學(北京)碩士學位論文基于遺傳算法的換熱器多目標優(yōu)化設計方法姓名：王恒申請學位級別：碩士專業(yè)：動力工程及工程熱物理；熱能工程指導教師：楊勇平；董長青201106t華北電力火學碩士學位論文AbstractTube—bundleheatexchangersareessentialequipmentsinthepowerplantsBoththesuperheatersandthereheatersaretypeofcrossflo

2、wtubebundleheatexchangersInthispaperwetakethelaststagesuperheaterwhichisastaggerarrangedtubebundleheatexchangerasourresearchmodelfewreferenceshaveinvestigatedTheoptimaldesignapproachoftube—bundleheatexchangersHowevertheo

3、ptimizationofheatexchangersbasedonthecombinationofthefirstandsecondlawofthermodynamicshasbeenincreasinglypopularinrecentdecadesastheconceptofentropygenerationminimizationhasbeenproposedbyBejanThedesignofheatexchangerssho

4、uldbeadaptedtotheirapplications；otherwisetheirperformanceswillbedeceivingandtheircostsexcessiveTomeettheminimizationofcostandtheminimizationofenergylosseswhichcannotbereachedatthesametime，Sincementionedobjectivesareconfl

5、ictingnosinglesolutioncanwellsatisfybothobjectivefunctionssimultaneouslyInotherwords，anyattempttoincreasethevalueofthetotalrateofheattransferleadstothehighertotalcostofthesystemwhichiscertainlyundesirable，Therefore，multi

6、objectiveoptimizationusinggeneticalgorithmareappliedextensivelyinrecentyearsThepurposeofourpaperistogettheminimumofpressuredropofeachsideandtheleastcostwhiletheentropygenerationminimizationisobtainedatthesametimeSevenobj

7、ectivefunctionsareoptimizedsuchascostandpressuredrop6structuresizesincludingtubesideouterdiameterlateraltubepitch，numberoftubepass，numberoftubepass，numberoftubeinonepass，tubelengthwereselected弱decisionvariablesThemainadv

8、antageofthisworkisprovidingasetofoptimalsolutionseachofwhichcarlbeselectedbythedesignerbasedontheproject’SlimitsandtheavailableinvestmentThepaperalsocomparedtheoptimizationresultswiththedesigndataofthecurrentpowerplant，t