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SolarEnergy&GreenEnergy Course:SPH4U Teacher:Eva Student:HuZhenyang(Khalil) Date:Dec.26,2010 SolarEnergy&Application Definition: Originateswiththethermonuclearfusionreactionsoccurringinthesun. Representstheentireelectromagneticradiation(visiblelight,infrared,ultraviolet,x-rays,andradiowaves). Advantages&Disadvantages Advantages 1)General:Sunlightcoverseverywhereandtherearenorestrictions. 2)Harmless:Developandusesolarenergywon’tpollutetheenvironment.It’soneofthecleanestenergy. 3)Huge:Theamountofreachingtotheearth’ssolarenergyisequalto1.3*10^14tonsofcoals 4)Foralongtime Disadvantages Sundoesnotshineconsistently. Solarenergyisadiffusesource.Toharnessit,wemustconcentrateitintoanamountandformthatwecanuse,suchasheatandelectricity. Addressedbyapproachingtheproblemthrough:1)collection,2)conversion,3)storage. 3)Application Generateelectricity Light-heat-electric:Usesolarcollectortotransferthermalenergytovapors,themusesteamerleadingelectricitygeneratorgenerateselectric. Light-electric:Usephotovoltaiceffecttransfersolarenergytoelectricdirectly.(Solarcell) Water-heatingsystem Twomethodsofheatingwater:passive(nomovingparts)andactive(pumps). Inboth,aflat-platecollectorisusedtoabsorbthesun’senergytoheatthewater. Thewatercirculatesthroughouttheclosedsystemduetoconvectioncurrents. Tanksofhotwaterareusedasstorage. Heatinglivingspace 1)Efficientheatingstartswithproperinsulationonexternalwalls,roof,andthefloors.Thedoors,windows,andventsmustbedesignedtominimizeheatloss. 2)Collection:south-facingwindowsandappropriatelandscaping. 3)Storage:Thermalmass—holdsheat. Solarcell AsolarcellisaHYPERLINK"http://en.wikipedia.org/wiki/Solid_state"\o"Solidstate"solidstatedevicethatconvertstheenergyofHYPERLINK"http://en.wikipedia.org/wiki/Sunlight"\o"Sunlight"sunlightdirectlyintoHYPERLINK"http://en.wikipedia.org/wiki/Electricity"\o"Electricity"electricitybytheHYPERLINK"http://en.wikipedia.org/wiki/Photovoltaic_effect"\o"Photovoltaiceffect"photovoltaiceffect.Assembliesofcellsareusedtom