Abstract
Angular selective control of daylight, solar heat gain and visual performance is the aim of a variety of emerging technologies for windows, roof and wall glazing. Certain oblique thin metal and metal/insulator films on glass have transmittance as a unique function of direction of incidence and they are also spectrally selective. A variety of angular selective control options result according to choice of film materials covering one or a combination of (i) light and glare from high angles (ii) solar heat gain (iii) visual amenity (iv) glare from lower angles (iv) emittance control. They are thus able to be adapted by materials choice to the needs of different latitudes and window orientations. A new and simple way of categorizing performance will be presented.
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