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Proceedings Paper

Low Emissivity And Solar Control Coatings On Architectural Glass
Author(s): Wolf-Dieter Dachselt; Wolf-Dieter Munz; Michael Scherer
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Paper 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.

Paper Details

Date Published: 12 April 1982
PDF: 7 pages
Proc. SPIE 0324, Optical Coatings for Energy Efficiency and Solar Applications, (12 April 1982); doi: 10.1117/12.933252
Show Author Affiliations
Wolf-Dieter Dachselt, Leybold-Heraeus GmbH (Germany)
Wolf-Dieter Munz, Leybold-Heraeus GmbH (Germany)
Michael Scherer, Leybold-Heraeus GmbH (Germany)

Published in SPIE Proceedings Vol. 0324:
Optical Coatings for Energy Efficiency and Solar Applications
Carl M. Lampert, Editor(s)

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