Low Emissivity And Solar Control Coatings On Architectural Glass

Wolf-Dieter Dachselt; Wolf-Dieter Munz; Michael Scherer

doi:10.1117/12.933252

12 April 1982 Low Emissivity And Solar Control Coatings On Architectural Glass

Wolf-Dieter Dachselt, Wolf-Dieter Munz, Michael Scherer

Proceedings Volume 0324, Optical Coatings for Energy Efficiency and Solar Applications; (1982) https://doi.org/10.1117/12.933252
Event: 1982 Los Angeles Technical Symposium, 1982, Los Angeles, United States

Abstract

Methods of depositing thin films on glass using the vacuum coating technic have been developed to impede the transfer of heat through glass thus reducing the energy costs for room heating or air conditioning. Heat reflecting so-called low emissivity coatings permit a maximum amount of daylight to pass through, but then block the heat that is generated when light strikes an object (greenhouse effect). They are composed of metals like silver or copper sandwiched in selected oxide films or they are transparent semi-conducting monofilms. Double glazed insulating units with coated glass achieve k-values in the order of magnitude 1,8 to 1,5 Watts per squaremeters and degree Kelvin. Maximum available trans-mittance values at lambda = 550 nm are 85% (single pane), maximum reflectance values are 93% measured at lambda = 8 wa. The corresponding emissivities are around 0,1. The investigated low-e films are stable within 1% concerning transmittance and sheet resistance changes when exposed to elevated temperatures in air of up to 150°C. Solar control films used to keep out sunheat are sputtered in a reactive gasatmosphere on. the base of titanium, stainless steel or chromium. Reflectance values of 32% are achieved at a transmission of e.g. 8%. The shading coefficient b is about 0,27. Large-scale production equipment for sputter deposition of the cited films is introduced.

Citation Download Citation

Wolf-Dieter Dachselt, Wolf-Dieter Munz, and Michael Scherer "Low Emissivity And Solar Control Coatings On Architectural Glass", Proc. SPIE 0324, Optical Coatings for Energy Efficiency and Solar Applications, (12 April 1982); https://doi.org/10.1117/12.933252

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