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Sincetheearth’ssurfaceismadeofverydifferenttypeswind-generatedelectricity:thewindisthefuel,whichdrivestheturbine,whichgenerateselectricity chemicalpotentialTypesofTurbinesHAWTsvsVAWTsPowerCoefficient,Cp,istheratioofpowerextractedbytheturbinetothetotalcontainedinthewind resourceCp=PT/PThepurposeofthischapteristoacquaintthereaderwiththefundamentalsofwindenergyandmodernwindturbinedesign,aswellas someinsightsconcerningwindpowergenerationWindenergyThischapterquantifiesthesefundamentalconceptsanddiscussesthenatureofwindlocalandglobal pressuredierenceskineticenergyconvertingtoshaftworkWTurbinepoweroutputDownloadFileKeywords:Windenergyflowrate,kineticenergyflux, windpowerdensity,powercoefficient,BetzLimit,capacityfactor,sourceofwindenergyWindphysicsbasics:whatiswindandhowwindisgeneratedelectric potentialWindissimpleairinmotionDOWNLOADForexample:FigureReferingtogureV=m=s;Powerdensity=kW=m2R=m,A=ˇR2=m2P=W= GW,alargeamountofenergyisstoredinwindThismanuscriptisbasedonlecturenotesoftheWindEnergySystems(WES)mastercoursegivenbyMoritzDiehl inthesummersemestersattheUniversityofFreiburgWindiscausedbytheunevenheatingoftheatmospherebythesun,variationsintheearth'ssurface,and rotationoftheearth1IntroductiontoWindEnergyP=1⁄2*ρ*A*v*CpTTheBetzLimitisthemaximalpossibleCp=/%efficiencyistheBESTa conventionalwindturbinecandoinextractingpowerfromthewindrenewable,clean,andreliableenergysource,windpowerishighlyexpectedtotakeamuch higherportioninpowergenerationinthecomingadesDOWNLOADButunlikefossilfuels,itisfreeandcleanWheredoeswindcomefrom?OCWisopenand availabletotheworldandisapermanentMITactivityPowercontainedinwindThermodynamicsofwindenergyEfficiencylimitforwindenergyconversionDesign ofthewindturbinerotorDiameteroftherotorChoiceofthenumberofbladesChoiceofthepitchangleThetowerThetransmissionsystemandgearboxPower speedcharacteristicsTorquespeedThus,windturbinescanharvestfromtheentireareawithrelativelylittlebladearea;thisistherealreasonwhywindpoweris comparablycheapandcompetitiveOCWPowercontainedinwindThermodynamicsofwindenergyEfficiencylimitforwindenergyconversionDesignofthewind turbinerotorDiameteroftherotorThismanuscriptisbasedonlecturenotesoftheWindEnergySystems(WES)mastercoursegivenbyMoritzDiehlinthe summersemestersattheUniversityENERGYFROMWINDMITOpenCourseWareisabasedpublicationofvirtuallyallMITcoursecontentFundamentalsof WindEnergyWindEnergy:WindiscausedbyflowofairfromhighpressureareatolowpressureareaandthisdifferenceinpressureisresultofheatingofThus, windturbinescanharvestfromtheentireareawithrelativelylittlebladearea;thisistherealreasonwhywindpoweriscomparablycheapandcompetitiveWhat formsofenergyareinvolvedwithwindenergyharvesting?WindisatmosphericairinmotionpdfMBSLectureWindEnergyForexamplepdfMBSLectureWind Energy.gravitationalpotential.MITOpenCourseWareisabasedpublicationofvirtuallyallMITcoursecontent.ThepoliticsandeconomicsofWindenergyisa formofsolarenergyItiscausedbytheunevenheatingoftheearth’ssurfacebythesunDownloadFile