Glazings for the 21st Century - Windows and Daylighting Group

More documents

Recommendations

Info

4Contributing EditorsRoss McCluneyFlorida Solar Energy CenterVoice:(407) 638-1414Fax: (407) 638-1010e-mail: rmccluney@fsec.ucf.eduWeb:http://www.fsec.ucf.edu/~fen/Jeff ChristianOak Ridge National LaboratoryVoice: (423) 574-5207Fax: (423) 574-9338e-mail: jef@ornl.govWeb:http://www.ornl.gov/ORNL/Energy_Eff/btc.htmlAl CzandernaNational Renewable EnergyLaboratoryVoice: (303) 384-6460Fax: (303) 384-6604e-mail: al_czanderna@nrel.govWeb: http://www.nrel.gov/Dragan CurcijaUniversity of MassachusettsVoice: (413) 545-2251Fax: (413) 545-1027e-mail: curcija@ecs.umass.eduWeb:http://www.ecs.umass.edu/mie/labs/berlJohn CarmodyMinnesota Building ResearchCenter1425 University Avenue SEMinneapolis MN 55455Voice: (612) 624-1351Fax: (612) 626-7424e-mail: carmo001@tc.unm.eduWeb:http://www.umn.edu/mnbrc/F A L LW I N T E R1 9 9 7LAWRENCE BERKELEYNATIONALLABORATORYENVIRONMENTALENERGYTECHNOLOGIES DIVISIONBUILDING TECHNOLOGIESPROGRAMWINDOWS & DAYLIGHTINGGROUPIntegrating Energy-Efficient FeaturesInto a Window/Wall Panel SystemTo integrate or to segregate?Residential windows combine acomplex set of material properties,mechanical mechanisms,and functional requirements.Windows must last many yearswhile keeping the elements out,the occupants comfortable, allowingdaylight in, and providingview out. All this in a packagethat can be easily and reliablyinstalled in a building envelope.Integrated Window SystemOngoing research in manysectors of the building industryhave created improvements inall areas of window design andfunction. To achieve the nextstep, researchers at BerkeleyLab are integrating several keyenergy-efficient features into awindow/wall panel, an IntegratedWindow System (IWS).The key elements of an IntegratedWindow include an exteriorsun shade to block the sun'sheat, and an interior insulationthat covers the window at nightto keep the warmth inside. Amanufactured construction approachincludes these energy-efficientfeatures in a full heightwall panel providing the wallstructure, the structural headerto transfer roof loads around thewindow, and a raceway for utilitiesrun under the window.Each of these elements addsmeasurable gains in comfort andthermal control to the building’soccupants that are more reliableand more useful than devices installedin the field. By placingthese elements in a manufacturedunit they can be employedto their optimum.ContactPaul LaBerge(510) 486-6830 Fax (510) 486-6099e-mail: P_LaBerge@lbl.govStriking Changesin Russian WindowProductionUntil recently, windows in Russianresidential buildings werelimited to three types: singleglazed, double-glazed, andtriple-glazed. Insulated glassunits were used on rare occasion,but only in municipalbuildings and in public transportation.This was of little concernwhen heat prices were low.In fact, the cost of energy wassuch that an investment to replacedouble-glazed with tripleglazedwindows would havehad a payback period of at least20 years.Striking changes have occurredin the field of windowproduction in Russia within thepast two years. Russia's transitionto a market economy, andthe sharp rises in prices of fueland energy have stimulated interestin energy-efficient windows.Based on a review ofRussian legislation on foreigninvestment, the most favorablecourse of action for foreign investorsin the construction sectoris probably the establishmentof joint ventures withRussian partners. The followingdevelopments are indicative ofthe changing market environment:• Adoped new Federal constructionstandards.• Established new voluntary certificationprogram by Ministryof Construction.• Increased Russian companies’manufacturing of new windowsby licensing foreign technology.• Russian companies producingglass and film with lowemissivitycoating with purchasesof foreign equipment.• In-country production capacityfor ordinary 3-6-millimeterglass is approximately 135-140million square meters per year,enough to meet current demand.• More than two billion squaremeters of buildings constructedsince 1961 need windowsreplaced to meet currentbuildings standards.• Market potential for IGUs estimatedat 24 million square feetper year. Currently, only 10 percentof this need is being met.• New construction in Moscowarea includes office buildings,business centers, and hotels, inpreparation for Moscow's 850thanniversary.ContactAlex SpiridonovSOLResearch Company,Moscow, Russia7 095 401-1960 Fax 7 095 482-4460e-mail: spiridon@santeh.msk.suFor more information, seehttp://www.pnl.gov/aisu/spiridon.htm .Moscow WorkshopPlanned for May 1998Avery successful joint meetingwas held in Moscow in May1997 between a U.S. team,comprised of DOE researchersand manufacturers, and a Russianteam, comprising code officialsand manufacturers. Afollow-upworkshop is planned forMay 1998 in Moscow.ContactJohn Hogan(206) 386-9145 Fax (206) 233-7883e-mail: john.hogan@ci.seattle.wa.usWilliam Dupont(202) 484-0887 Fax (202) 484-0888e-mail: Waupi@msn.com
U.S. Department of EnergyThe Electrochromics InitiativeIn 1995, the U.S. Department of Energy (DOE)launched an Electrochromics Initiative to accelerateresearch and development on electrochromicmaterials that would lead ultimately to commercialproducts. After issuing a competitive solicitationfor Phase One of the Initiative, the Departmentchose two manufacturers to develop electrochromicwindow prototypes, Optical CoatingLaboratory, Inc. (OCLI) of Santa Rosa, California,and the Donnelly Corporation of Tucson, Arizona.Berkeley Lab's role in this work is to providetechnical oversight of the Initiative for DOE, tosupply technical assistance to these companies, towork on improved materials for the coatings, andto assess the performance of electrochromic coatingsin buildings using simulation tools, fieldtests, and demonstration projects. Both vendorshave now delivered prototype windows of aboutone square foot in size. Berkeley Lab has conductedoptical characterization tests and Berkeley Labresearchers have also performed computer simulationsof the prototypes' energy and visual performanceusing, respectively, the DOE-2 and RADI-ANCE models. Al Czanderna's group at the NationalRenewable Energy Laboratory (NREL) hasbeen conducting durability tests on the samples(see article below). The results of the durabilitytests have proven useful in helping the Initiative'sindustrial partners improve their processes and definewhere the work will proceed in the Initiative'ssecond phase.ContactMike Rubin(510) 486-7124 Fax (510) 486-6099e-mail: MDRubin@lbl.govNational Renewable Energy LaboratoryDeveloping Testing Protocolfor Electrochromic WindowsThe National Renewable Energy Laboratory isleading the effort to develop a testing protocol forelectrochromic windows (ECWs). This protocolwill be ideal for testing electrochromic samples,such as the one-foot-square specimens now underdevelopment at Optical Coating Laboratory, Inc.(OCLI) and Donnelly Corporation. Visual inspectionand initial characterization for optical responseproperties are the first two steps of the protocol,followed by two tests, performed in parallel.For a thermal qualification test, the sampleswill be cycled between 76°C and -26°C at a cyclerate of five cycles per day (4.8 hours/cycle). Thesamples will not be exposed to solar radiation orhumidity, and they will not be switched during thetest, whose purpose is to establish that ECWs willsurvive the thermal cycling anticipated when theyare in service.In the temperature-radiation-cyclic I-V (currentvoltage) test, alkali halide lamps in an AtlasXR260 four-by-six-foot accelerated testing chamberwill irradiate the sample. These lamps are filteredto provide an AM 1.5 solar spectrum, includingUV radiation from 290 to 400 nm. The ECWslie in a horizontal plane, and a detector measuresirradiation intensity in this plane. The chamber'sair temperature is constant and is chosen to providea mean ECW coating temperature of 60°Cduring the test. Each device will receive the I-V itrequires for coloring and bleaching, generally inthe range of one to ten minutes per cycle. Irradiationby the alkali halide lamps increases the temperatureof the ECWs, especially in the coloredstate. Relative humidity in the chamber will bemeasured, but not controlled.ContactAl Czanderna(303) 384-6460 Fax (303) 384-6604e-mail: al_czanderna@nrel.govFlorida Solar Energy CenterComputationalAnalysis of ComplexFenestration SystemsRoss McCluney of the Florida Solar Energy Center,Coco, Florida, is leading the computationalpart of the effort to analyze complex fenestrationsystems.ASAPis a design and analysis computer programfor large optical systems that evaluates notonly specularly reflecting and transmitting elements,but diffuse surfaces as well. An ASAPusercan enter complex shading and other fenestrationsystem geometries, and specify a distribution,both geometric and spectral, of electromagneticradiation incident on the system. The programgenerates output data that characterizes the wholefenestration system as an object, and predicts thecomplete angular and spectral distributions of itsoptical properties.Since ASAPis an optical programming language,as well as a powerful computational tool, itshould be possible to prepare a custom versionadapted to the specific problem of calculating theoptical properties of complex fenestration systems.ContactRoss McCluneyFlorida Solar Energy Center(407) 783-0300 Fax (407) 783-2571e-mail: rmccluney@fsec.ucf.edu5MoWiTTTests ofElectrochromic PrototypesSmall-scale electrochromicprototypes from Donnellyand OCLI, participants inthe DOE/ElectrochromicInitiative, have recentlybeen tested in the MoWiTTfield test facility. The glazingswere incorporated intoskylight frames supplied byVelux. The summer testprogram included commerciallyavailable clear, tinted,and spectrally selectiveglazings as well. This projectrepresents the first useof MoWiTTfor skylighttesting and will providevaluable field experienceand performance data on energyflows and temperaturesexperienced by the skylightsand their glazing assemblies.ContactJoseph Klems(510) 486-5564Fax (510) 486-4089e-mail: JHKlems@lbl.govF A L LW I N T E R1 9 9 7LAWRENCE BERKELEYNATIONALLABORATORYENVIRONMENTALENERGYTECHNOLOGIES DIVISIONBUILDING TECHNOLOGIESPROGRAMWINDOWS & DAYLIGHTINGGROUP
Page 6: 6Fenestration Facts“The most prom
Page 9 and 10: Exciting New Publicationsfor the Bu
Page 11 and 12: UserFacilitiesIndustry is invited t

Glazings for the 21st Century - Windows and Daylighting Group

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?