Abstract
The solar and thermal characteristics of various glazing systems incorporating Teflon (FEP) films as inner glazings are examined. Teflon film was chosen because of its excellent chemical and UV stability, very high solar and visible transmissivity, low weight and off-the-shelf availability. Variables include number of glazings, inter-pane spacing, Teflon film thickness, fill gas type and the placement of low emissivity coatings. It is shown that the long-wave (λ>3μm) optical properties of thin Teflon films make them well suited for use as inner glazings when used in conjunction with a low emissivity coating. For example, two panes of conventional window glass plus one low emissivity coating and one Teflon film have more than 50% greater thermal resistance than the same glazing system without the Teflon film (and more than double that of conventional double glazed). The shading coefficients of these two windows are essentially equal.
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