With ever more stringent energy codes and the march towards zero energy buildings, architectural design freedom using glass over large glazed areas may become more constrained as windows are increasingly viewed as the weak energy link in the building envelope. Electronically tintable glass, also known as electrochromic (EC) glass, allows the building facade to become dynamic, changing the transmission of the sun's heat and light in response to the exterior environment and the needs of the building's occupants. By modulating the visible light transmission and solar heat gain coefficient across a wide range, EC glass provides both energy savings and enhanced thermal and visual comfort to the building occupants without obstruction of the view.
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