光信息科学与技术本科毕业论文外文翻译

安徽工业大学毕业设计(论文)-1-外文翻译《Performanceevaluationofconcentratingsolarphotovoltaicandphotovoltaic/thermalsystems》AbstractHybridconversionofsolarradiation,whichallowssimultaneousconversionofsunlightintothermalandelectricalenergyinthephotovoltaic/thermalcollector,isoneofthemostpromisingtechniquesofsolarenergyexploitation.Inthisstudy,lowconcentratingphotovoltaic(PV)andphotovoltaic/thermal(PVT)systemsweredesignedandtestedforagivenspringclimaticconditionoftheTunisianSaharancityTozeur.Thesystemisbasicallyanasymmetriccompoundparabolicphotovoltaicconcentrator.Asthissystem’sperformancedeteriorateswithrisingthesolarcellstemperature,weproposedtoconvertitonahybridoneinordertoimproveitselectricalefficiencyandtorecuperatesimultaneouslythermalenergy.ThecomparisonofthesesystemsoperatingconfirmedtheimprovementoftheelectricalperformanceofthecombinedPVTsystemanditsacceptablethermalenergyproduction.Acomputationalfluiddynamics“CFD”modelwhichinterpretsthePVTsystemwasthendevelopedandvalidatedagainsttheexperimentalresults,provingthevalidityofthedevelopedmodelusetoidentifynumericallythissystemlimitationsandpredictthepossibleimprovements.2013ElsevierLtd.Allrightsreserved.Keywords:Concentratingphotovoltaicsystem(CPVS);Concentratingphotovoltaic/thermalsystem(CPVTS);CFDsimulation;Performanceanalysis1.introductionHybridphotovoltaic/thermal(PVT)solarsystemsarelessexpensivedevicesthanthetwoseparateunitswhichcansimultaneouslyprovideelectricityandheatwithhigherconversionratesoftheabsorbedsolarradiationthanstandardPVmodules.Duringthelasttwodecades,theutilizationofthissolartechnologywasthesubjectofseveraltheoreticalandexperimentalstudies,helpingtosortoutsuitableproductsandsystemswiththebestperformance.Ibrahimetal.(2011)presentedtheperformanceofwater,airandcombinationofwaterandairsystemsforaflatPVTcollector.Thisreviewhasconsidereddifferentdesignsandindicatedthatthemostimportantfactorsthatinfluencetheefficiencyofthesystemaretheareawherethe安徽工业大学毕业设计(论文)-2-collectoriscovered,thenumberofpassesandthegapbetweentheabsorberandsolarcells.Similarly,MishraandTiwari(2013)studiedtheeffectofthecollectorareacoveredbyPVmoduleontheperformanceofhybridPVTwatercollector.TheyconsideredtwoconfigurationsinwhichthecollectorispartiallyandfullycoveredbyPVmoduleandcomparedtheirresultswiththoseofaconventionalflatplatecollector.Ghanietal.(2012)consideredaPVTcollectorofvariousdesign,geometricshapeandoperatingcharacteristicsanddiscussedtheeffectofnon-uniformflowdistributiononthethermalandelectricalperformanceoftheirsolarsystem.Lietal.(2011a)characterizedexperimentallythethermalandelectricalperformanceofa2m2PVTsystem.Theseexperimentsweredoneforthreedifferenttypesofsolarcellsandtheoptimaldesignwasevaluated.Inotherinvestigation,Lietal.(2011b)evaluatedtheoverallperformanceofa10m2CPVTSanddiscussedtheeffectofthesolarcellarrayonitsthermalandelectricalefficiency.Inordertoimprovetheperformanceofthissystem,a2m2PVTsystemutilizingamirrorofhigherreflectivitywasthenbuiltanditscontributiontotheeffectiveoperatingofthePVTsystemwaspresentedregardingitsthermalefficiency.Jietal.(2007)consideredasolarsystemwhichconsistsofaflat-boxaluminum-alloyphotovoltaicandwater-heatingsystemwithsingle-crystallinesiliconcellsintegrated.DynamicsimulationswereperformedandtheeffectofthePVcellcoveringfactorandtheglazingtransmissivityontheoverallsystemperformancewerediscussed.GargandAgarwal(1995)proposedaconversionofaconventionalwaterheaterintoacombinedsystembypastingsolarcellsdirectlyovertheabsorberplate.Thisstudywasdonefordifferentsolarcellareas,massflowratesanddifferentwatermasses,andindicatedtheoptimalflowrateforamaximumefficiency.Similarly,theeffectofthemassflowrateonthethermalandelectricalefficiencyofaPVTairsystemwasstudiedbyBambrookandSproul(2012)whoshowedthattheirsolarsystemperformsbetterforhighvaluesoftheairmassflowrate.AnotherintegratedcombinedPVTsolarwaterheatingsystemwasdesignedandtestedoutdoorNewDelphiclimatebyDubeyandTiwari(2008)whodiscussedtheeffectofthedesignandtheclimaticconditionsonthesystemoperation.Bernardoetal.(2011)proposedacompletemethodologytosimulateaPVTcollectorandpresentedacomparisonoftheirsystemperformancerelativelytoastandardPVmoduleandaflatplatecollector.Cristofarietal.(2009)developedasimulationmodeloffinitedifferencesdescribingtheoperatingofahybridPVTcollectorandnotedtheimportanceoftheutilizationofacopolymerforthetotaldesignofthesolarcollector.Tiwarietal.(2009)werebasedontheenergybalanceanddiscussedanalyticallytheperformanceofanintegratedPVTsolarsystemregardingthewatertemperature,theexergyandthethermalandelectricalefficiencyfordifferenthotwaterwithdrawalflowrates.Regardingthestrategiesproposedtoimprovethesesystemsperformanceandinordertogetmorethermalandelectricalenergy,reflectorsweremountedbyKosticetal.(2010)inthePVTcollectorandtheirpositionwaschangedtoevaluatetheoptimalone.Similarly,foradditionalpowerproduction,Kosmadakisetal.(2011)presenteda安徽工业大学毕业设计(论文)-3-feasibilitystudyofaCPVTSinwhichtheheatproducedisrecoveredbyanorganicRankinecycle.Resultsshowedtheeffectivenessofthechangeregardingtheelectricalproduc