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Table of Contents SectionPage List of Figures2 Introduction3 Definitions4 Current Options In Widows Energy Efficiency5 Understanding How Energy Moves Through Windows 5 Different ways Energy Travels5 How is Energy in Windows Measured6 R-values U-values6 Types Of Glazings In Windows6 Low-e Glazing7 Spectrally Selective Coatings7 Heat-Absorbing Glazings8 Reflective Coatings8 Tomorrows Options for More Efficient Windows8 Superwindows8 SummaryConclusions10 Recommendations11 References Cited12 List of Figures FigurePage 1 How energy flows through windows Radiation6 2 How energy flows through windows Convection 6 3 How energy flows through windows Conduction7 4 Three Routes to Switchable Windows10 Introduction Until recently clear glass was the primary glazing material used in windows Although glass is durable and allows a high percentage of sunlight to enter buildings it has very little resistance to heat flow During the past two decades though glazing technology has changed greatly Research and development into types of glazing have created a new generation of materials that offer improved window efficiency and performance for consumers While this new generation of glazing materials quickly gains acceptance in the marketplace the research and development of even more efficient technologies continues Definitions Gas Fill A heavier-than-air gas such as argon or krypton is used to fill the space between panes to slow heat transfer Glazing The glass andor plastic in a window unit that provides visibility yet blocks air leakage and some of the heat flow Infrared Radiation Invisible radiation that humans perceived as heat Low-e Coating Low-emissivity low-e coatings on glass surfaces reflect heat energy but transmit visible light Pyrolytic Hard Coat Low-e Durable metal oxides that are fused into the surface of window glass Sputtered Soft Coat Low-e A coating on
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