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Energy Efficiency & Environmental News: Facts On Energy And Energy Use
http://edis.ifas.ufl.edu/ ( Publisher's URL )
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Permanent Link: http://ufdc.ufl.edu/IR00001710/00001
 Material Information
Title: Energy Efficiency & Environmental News: Facts On Energy And Energy Use
Physical Description: Fact Sheet
Creator: Cook, Gary
Publisher: University of Florida Cooperative Extension Service, Institute of Food and Agriculture Sciences, EDIS
Place of Publication: Gainesville, Fla.
Publication Date: 1991
 Notes
Acquisition: Collected for University of Florida's Institutional Repository by the UFIR Self-Submittal tool. Submitted by Melanie Mercer.
Publication Status: Published
General Note: "Publication date: December 1991."
 Record Information
Source Institution: University of Florida Institutional Repository
Holding Location: University of Florida
Rights Management: All rights reserved by the submitter.
System ID: IR00001710:00001

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December1991EnergyEfficiency&EnvironmentalNews: FactsonEnergyandEnergyUse1 FloridaEnergyExtensionServiceandGaryCook2FACTSONENERGYANDENERGYUSE Whatislightingefficiency?Answer:Lightingefficiencyisusuallyexpressedin lumensperwatt(lumen=about1candle).Edison's lightbulbproducedabout0.6lumensperwatt.A modern60-wattincandescentbulbproduces14.8 lumensperwatt.A13-watttwintubefluorescent produces56.3lumensperwatt.HowmuchdoIsave usingacompactfluorescentlight?Changing incandescenttocompactfluorescentlightingbenefits everyone.Acompactfluorescentlightusing16watts ofenergyreplacesa60-wattincandescentbulb.The lifeofthisbulbis10,000hoursorapproximately10 timeslongerthananincandescentbulb,saving$35 worthofenergyoverthelifeofthebulb.This eliminatestheemissionof1300poundsofcarbon dioxideand26poundsofsulfurdioxidefromacoal firedplantproducingelectricity.Considering10 incandescentbulbswouldhavetobereplacedatan averagecostof50cents,thetypicalnetsavingsusing compactfluorescentswouldbe$25perbulb.The logicandeconomicsinenvironmentalsavingsare difficulttoignore.(Cook)ShouldIturnofffluorescentlightswhen leavingtheroomforonlyashortperiodof time?Answer:Bothenergyandmoneyaresavedwhen turningofffluorescentlights,evenforashortperiod. Whenfluorescentlightswerefirstintroduced,starters wererequiredalongwithballastsystemsthatrequired aheavyamountofstart-upenergy.Lifewasseverely shortenedbyrepeatedon-offswitching.However, beginningin1976,fluorescentbulbsandballasts becamemuchmoreefficient.Consequently,both energyanddollarsaresavedwhenfluorescentlights areswitchedoffevenforarelativelyshortperiod, suchaswhengoingtothebathroomorgettingcoffee. Althoughbulblifeisshortenedslightly,thesavingsin energymorethancompensate. HighIntensityDischarge(HID)lights,suchas mercury,sodiumvaporandmetalhalide,shouldnot beturnedoffforperiodslessthan20minutesbecause ofthelongcooldownandwarmuptimesrequired. (Cook,FEO) 1.ThisdocumentistheDecember1991issueofEnergyEfficiencyandEnvironmentalNews,thenewsletteroftheFloridaEnergyExtension Service,FloridaCooperativeExtensionService,InstituteofFoodandAgriculturalSciences,UniversityofFlorida.Publicationdate:December 1991. 2.FloridaEnergyExtensionService,UniversityofFlorida,P.O.Box110940,Gainesville,FL32611-0940;GaryCook,SchoolofBuilding Construction,UniversityofFlorida,FAC101,Gainesville,FL32611,(904)392-7403,CooperativeExtensionService,InstituteofFoodand AgriculturalSciences,UniversityofFlorida,GainesvilleFL32611. TheFloridaEnergyExtensionServicereceivesfundingfromtheFloridaEnergyOffice,DepartmentofCommunityAffairsandisoperatedbythe UniversityofFlorida'sInstituteofFoodandAgriculturalSciencesthroughtheCooperativeExtensionService.Theinformationcontainedherein istheproductoftheFloridaEnergyExtensionServiceanddoesnotnecessarilyreflecttheviewsoftheFloridaEnergyOffice.

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EnergyEfficiency&EnvironmentalNews:FactsonEnergyandEnergyUse Page2Howmuchenergydoesittaketoproduce aluminum,copper,steelandotherbuilding materials?Answer:Virtuallyallmaterialshaveintrinsic energy.Ittakesabout94,000BTUstoproduceone poundofvirginaluminum.FivethousandBTUsare neededtoproduceonepoundofaluminumfrom recycledaluminum.Ittakesabout55,500BTUsto produceonepoundofvirgincopper,22,700BTUsfor onepoundofvirginsteel,and40,640BTUsofenergy toproduceaneightfoot2'x4'stud.(Dr.Howard Odum,UF)Howdoesenergysavinginthehome comparetorecyclingenergysavings?Answer:Electricalenergysavingsinthehomeis almost18timesgreaterthanenergyrecovered throughrecyclingintermsofthesamepercentage. Forexample,ifafamilyofthreereducetheirwaste streamby10%throughrecycling,approximately 77,400BTUsofenergycouldbesaved.Ontheother hand,reducingelectricalcostsintheaveragehomeby 10%couldmeanasavingsof1,365,000BTUsatthe powerplant.(Cook,Odum)Howmuchenergycouldbesavedbyusing pinestraworwoodchipsforadriveway insteadofasphalt?Answer:Approximately13millionBTUS.Thisis equivalenttotheenergysavedbyafamilyofthree recycling3O%oftheirsolidwastestreamforalmost fiveyears.(Cook) "...whenyoucanmeasurewhatyouarespeaking aboutandexpressitinnumbersyouknowsomething aboutit..."(LordKelvin,1883)WhatcolorasphaltshingleroofshouldIput onmyFloridahome?Answer:Anycoloryoulike.Greenisnormallya bettercolorforabsorbingsunlightthanblack(Mother Naturecan'tbewrong).Dr.EricFarbersresearch showsthatcolormaynotbethemostimportant characteristicindeterminingabsorptionofheat.His researchshowsthereareabout40characteristicsthat determineabsorption,oneofwhichiscolor.Texture mayplayamoreimportantrole.Thisresearcherhas demonstratedthatasmooth,blacksurface,when exposedtosunlight,willoftenbecoolerthanawhite, roughsurface.Interestingly,roofcolorandattic ventilationmakelittledifferenceindetermining temperaturesinattics.StudiesbyT.S.Weatherington ofFloridaPowerCorporation,RogerMessengerof FloridaAtlanticUniversity,andthiswriterhave shownlittlevarianceintemperaturesrelatedtocolor, typeofrooforventilationmethodology.These studiesshowthatveryseldomwillattictemperatures exceed11OFforairjustaboveinsulationorceiling level.However,thetemperaturewithininsulationon asummerdayoftenexceedsthetemperatureofthe airaboveit.Thedifferenceforthisdiscrepancy comesfromradiantheatbeingtransmittedfromthe roofdeck,whichoftengetsashighas140F. Simulationsbythiswritershowthatittakes171/2 tonsofairconditioningtocoolasmall1200square footatticto78F.Howmuchdifferencedoesatticventilation makeinreducingattictemperatures?Answer:Notmuch.Astudybythiswriterused temperaturesensorsplacedabovetheceiling insulationandontheconditionedsideoftheceiling. Thewholehousefan,movingapproximately8,000 cubicfeetofairperminute(awholelot!),only reducedtheattictemperaturebyeightdegreesand theceilinglessthanonedegree.Conclusions: Turbineventsarenotrecommendedforroof installation.Powerventsfortheatticarenot recommendedastheygenerallyusemoreenergythan theysave.Othersuper-ventilationtechniquesmaystir upthestillairspaceswithintheatticinsulationitself. Thebeststrategyistheuseofradiantheatbarriers laiddirectlyontopoftheinsulationwiththefoilside up.Seamsshouldnotbesealed;or,perforated radiantbarriermaterialsshouldbeusedtoprevent condensation.Shouldvaporbarriersbeusedinbuildings?Answer:Vaporbarriersarenotrecommendedfor Floridahomesandcommercialbuildings,particularly ontheinteriorwalls.Vinylwallpapersserveasa vaporbarrierandshouldbeavoided,particularly whereinsidetemperaturesareexpectedtobebelow 75F,otherwise,condensationcouldoccurunderthe wallpaper.(Cook,Dr.VirginiaPeart,UF)ShouldIwashallmyclothesincoldwater usingacoldwaterdetergenttosaveenergy?Answer:No.AccordingtoMaytagstudies, washinginwarmwatermaybemoreenergyefficient

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EnergyEfficiency&EnvironmentalNews:FactsonEnergyandEnergyUse Page3thanwashingincoldwater.Oilsemulsifybetterin warmwaterthanincoldwater,allowingless detergenttobeused.Detergentisveryenergy intensiveandtendstopollutetheenvironmentwith phosphates.Theotheralternativeistousealonger washingcycle,whichiscounterproductivetoenergy useaswell.Themostenergyefficientcleanclothes arethosewashedwithwarmwater.Ofcourse, delicateclothesshouldbewashedincoldwater. Diapers,towelsandmostsheetsshouldbewashedin hotwaterforsanitaryreasons.WhatshouldIconsiderwhenchoosing insulation?Answer:AtticsinnewFloridahomesshouldbe insulatedtoR-26orhigher.Celluloseshouldbe consideredforatticinsulation.Cellulose,designedto beblownorpouredintotheattic,isarecycled materialmadefromfinelyshreddednewspaperwith boronandboricacidaddedtomakeitfireretardant andinsectrepellant.Itcoversthecracksandcrevices intheatticmuchbetterthanfiberglassbattinsulation. Althoughmorestudiesareneeded,preliminary studiesindicatethatfiberglassparticlesusedin fiberglassinsulationusedintheatticmaycause cancerofthelungsinsomesituations.Intheattic, fiberglassparticlescanbestirredbyventilation, bringingthemintohumancontactthroughleaksin ductswhenrepairsaremadetothewiringandother systemslocatedintheattic,orwhenitemsinstorage areaccessed.Fiberglassisperfectlysuitableasan insulationinthewallswhereitisencapsulatedwith theoutsidesidingandinsidesheetrocknormallyused inconstriction.Cellulosecanalsobeblownwhile wet,butshouldbeallowedtodrythoroughlybefore coveringwithsheetrock.Theequivalentinsulationof celluloseinsulationapproximatesthatoffiberglass insulation.(Cook)