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Proceedings Paper

Role of suspended films in insulated glass units (Invited Paper)
Author(s): Floyd Gene Woodard; Thomas Pass
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Paper Abstract

When appropriately coated, suspended polymeric films can substantially improve the energy efficiency of insulated glass units or IGUs. For example, when an induced-transmission low- emissivity film, such as PET coated with a dielectric/metal/dielectric or DMD stack, it suspended within an IGU, the thermal conductivity of the unit is reduced considerably. This is a consequence of both the attenuation of heat radiation from the low-emissivity surface and the reduction of convective heat transfer due to the additional partition created by the suspended film. If an IGU with more solar screening is desired, the low-=emissivity DMD coating can be tuned to decrease solar and visible transmission while maintaining relatively constant coloration. An alternative approach for increasing solar screening which affects visible optics less, is to replace the DMD coating with a Fabry Perot or DMDMD filter. As a final example of the utility of coated suspended films, an IGU with an exceptionally high energy rating can be obtained by combining an antireflected film with a pyrolytic low-emissivity glass. The antireflected film serves as a light weight `invisible' partition which decreases thermal conductivity with an insignificant attenuation of solar radiation.

Paper Details

Date Published: 25 November 1992
PDF: 10 pages
Proc. SPIE 1727, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows, (25 November 1992); doi: 10.1117/12.130493
Show Author Affiliations
Floyd Gene Woodard, Southwall Technologies, Inc. (United States)
Thomas Pass, Southwall Technologies, Inc. (United States)


Published in SPIE Proceedings Vol. 1727:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XI: Selective Materials, Concentrators and Reflectors, Transparent Insulation and Superwindows

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