lecture 7: electric power generation february 3, 2009petra/phys3150/lecture7.pdfsummary of previous...
TRANSCRIPT
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Energy&Sustainability
Lecture7:ElectricPowerGeneration
February3,2009
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EfficiencyvsEfficacy• Efficiency:
• Abilityofconvertingelectricalpowertoradiantpower
• isusuallygiveninpercent,ex.atypicalCFLis17%‐21%efficient
• A15WCFLconvertsupto
0.83*15W=12.4Woftheelectricalpowerintoheat
€
η =Eout
Ein
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Efficacy
• Istheratioofluminousflux(inlumens)topower(usuallymeasuredinWatts)
• Mostcommonlyused:ratioofluminousfluxemittedfromalightsourcetotheelectricalpowerconsumedbythesource
• =>describeshowwellthesourcedoesatprovidingvisiblelightfromagivenamountofelectricity
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ResponseoftheHumanEyeStandard luminosity function y(λ) under bright conditions (Photocopic Vision)
Function under dim conditions not shown here (Scotopic Vision: maximum at 507 nm, efficacy of 1700 lm/W)
683 lm/W @ 555 nm
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LuminousEfficiency/Efficacy
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IlluminationExample
• Inputstage• PowerStation• Distributionsystem
• Yourmeter
• Usefulenergy!
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IlluminationExample(2)
• Ireadforonehourusinga60Wincandescentlamp:– HowmuchelectricalenergydidIuse?– Howmuchenergywaswastedasheat?– HowmuchvisiblelightdidIget?
– Howmuchprimary(coal)energydidIuse?
• Ireadforonehourwitha15WCLF,whataretheabovenumbersinthiscase?
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SummaryofPreviousLecture
• IncreaseinWorldpopulation• Dramaticincreaseinenergyuse
• Unevendistributionsofenergyresources• Self‐sufficiency,energyimporterandexporter
• Availabilityofresourcesshapeenergysceneofacountry
• Infrastructureimportantforbeingabletodevelopanduseenergyresources
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SummaryofPreviousLecture(2)
• ComparedUK,Denmark,USA,France,India• RegionswhichneedmosthelpappeartobedevelopingcountriesofSouth&EastAsiaandAfrica
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SummaryofPreviousLecture(3)
• Possiblecuresofenergyproblem:– Significantimprovementsinenergyefficiency(technology)
– Tapintobroadportfolioofenergyresources,developtechnologiestosupplementandultimatelyreplacenonrenewablefossilfuels
– StabilizationofWorldpopulation
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ElectricPowerGeneration
• Energyusestoday• ElectricPower
– Generation– Distribution(transmission)– Storage
• Sustainableattributesandissues
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Historictrends
• 1900:allcoal,veryinefficient– Coalfire– Gaslighting
• 2000:variedrange,moreefficient– Electricfire– Fluorescencelamps
– Butstillbiglossesatpowerstations
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Currenttrends
• Riseinconsumptioninservices=>increasedstandards,e.g.heating
• Lighting• Increaseinconsumptionattheworkplace:officesetc.
• Airconditioning• Largeriseintransportenergyuse:
– Travelbycar– Internationalairtravel
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InternationalComparison• Source:InternationalEnergyAgency,2006
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InternationalComparison(2)
• HigherGDP,higherconsumption• Butlargevariationamongthewealthycountries
• Comparingenergyefficiencies:– Primaryenergyfromlesswastefulforms– EarntheirGDPfromlessintensiveactivities
– Useenergymoreefficiently– Usemorefornon‐productiveactivities
• Historictrends
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MajorGrowthArea
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MajorGrowthArea
• Transportation;andwehaveseenthattherewasanimportgapbetweenoilconsumptionandproductions
• Anothermajorgrowthare:electricityuse
• Energyuseallowsusto:– Uselesshumanlabor
– Carryactivitiesatnight– Manufactureanddistributeproducts– Newactivities:travel,communicationsetc.
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PowerGeneration
• Wind,tidal,riverflows,etc.
Historical Intro
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PowerGeneration
• Wind,tidal,riverflows,etc.• Steamengine
Historical Intro
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PowerGeneration
• Wind,tidal,riverflows,etc.• Steamengine
• Oil&coal
Historical Intro
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PowerGeneration
• Wind,tidal,riverflows,etc.• Steamengine
• Oil&coal• Electricitygeneration&motor
Historical Intro
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PowerGeneration
• Wind,tidal,riverflows,etc.• Steamengine
• Oil&coal• Electricitygeneration&motor
• Electricpower
Historical Intro
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WhereDoWeGetElectricity?
• Nuclear&Fossil• Gas
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WhereDoWeGetElectricity?
• Non‐Thermal
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WhereDoWeGetElectricity?
• Solarinsolation
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WhereDoWeGetElectricity?
• Thermochemical
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Nextlecture
• Thepowergrid• BalanceenergysupplyandStorage