KnowledgeSeminarSeries:HighPerformanceGlass
October18,2017
JimLarsenDirector,TechnologyMarketing
CardinalGlassDivisions
• FG:flatglass• TG:tempered(safety)glass• CG:coatedglass(low-E)• LG:laminatedglass(safety&hurricane)• IG:insulatingglass(2and3paneunits)
WinnipegGlassDesignPriorities
• Coldweather:DesignforlowU-Factor– Reduceheatloss– Warmerglasssurfaceatwinternight
• WintersunonSouthelevation– Potentialforpassivedesign
• SummersunonEast&Westelevations– Bewarediscomfortduetooverheat
5 months below freezing
5 months below freezing
Low-Eunitsarewarmonwinternight. Clearglassiscool.
WinterSun:8hoursofDaylight
SummerSun:16hoursofDaylight
Highsolargainlow-Eishotinsunlight
EnergyTerms
• U-Factor(heatloss)
• SHGC:SolarHeatGainCoefficient
• VT:VisibleLightTransmission– Aesthetic(clarity,color)– Daylightingenergymostlyincommercial
TraditionalEnergySolutionsforWindows
1. Addlayerstoinsulateglass– Single,double,triple,etc.
2. Changeframematerial– Metal,thermalbreak,wood/vinyl/fiberglass– Addwarm-edgespacer
3. Addtintedorreflectiveglass– Absorbsunlightwithtintedglass– Rejectwithreflectiveglass
TheRuleofPanes
Eachlayerofglassinamulti-paneunitaddsapproximately1“R”totheinsulatingvalue
(Inch-PoundR-Value)
Low-Ecoatingsandgasfillsdisplacelayersofglass
LotsofPanes
SinglePane ~R1DoublePane ~R2TriplePane ~R3QuadPane ~R4………
“Octo-Pane” ~R8
“R2”Glass
WindowU~0.50(2.8)
“R4”Glass
WindowU~0.35(2.0)
Less“Pain”withLow-E
• SinglePane ~R1• DoublePane ~R2• TriplePane ~R3• QuadPane ~R4
• 2Pane+Low-E ~R3• 2P+Low-E+Argon ~R4
MoreLow-EandMorePanes
• SinglePane ~R1• DoublePane ~R2• TriplePane ~R3• QuadPane ~R4
• 2Pane+Low-E ~R3• 2P+Low-E+Argon ~R4
• Triplew/2Low-E+Argon ~R8
Non-MetalWindowU~0.30(1.7)
2Pane+WarmEdge+Low-E+Argon
TraditionalOptionsforSolarControlGlass
Tinted– Addscolorto“body”ofglass– Absorbssunlightandre-radiatestoexterior
Reflective– Mirrorappearance– Reflectssunlightout
ClearGlassWindowSHGC
~0.60
WindowSHGC
TheSolarSpectrum
45%3% 52%
2PClear:WindowSHGC~0.6
2PTinted:WindowSHGC0.4– 0.5
ANewOptionforSolarControlGlass
Tinted– Addscolorto“body”ofglass– Absorbssunlightandre-radiatestoexterior
Reflective– Mirrorappearance– Reflectssunlightout
SpectrallySelectiveLow-E– Clearglassappearancewithsolarcontrol– Reflectssolarinfrared(invisibletohumaneye)
HighSolarGainLow-E:WindowSHGC~0.5
MediumSolarGainLow-E:WindowSHGC~0.3
|Low-E|ClearGlassMedSolar|HighSolar
LowSolarGainLow-E:WindowSHGC~0.2
DualPaneInsulatingGlass
HighSolarGainLow-EonSurface3=HotinSunlight!
TriplePaneInsulatingGlass
TriplePaneCoatingRecommendations
• Avoidlow-Eoncenterpane(#3or#4)
• Usehighsolargainlow-Eon#5forbestvisiblecharacteristicsandloweredriskofthermalstressbreakage
• SelectHigh,Medium,orLow solargainlow-Efor#2surface(orientationspecific)
Thankyou!
Anyquestions?