Seasonal window glass directs light and heat

Seasonal window glass directs light and heat

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Swiss researchers have developed seasonal window glass that could make certain soft furnishings redundant. Office workers and home owners no longer have to block their own view in order to keep indoor space cool. Now, during the summer months, treated windows covered in a film containing micro mirrors bounce sunlight away from the building. EPFL scientists from the Laboratory for Solar Energy and Building Physics worked with Empa’s Laboratory for Advanced Materials Processing team. Micro-mirrors sit in a structure of laser-cut micro grooves, and film is wrapped around the entire object. The mirrors are made from Compound Parabolic Concentrator lenses. Designed especially for use in low visibility, the lens’ angle reflects the maximum amount of light. This is particularly useful during winter months of shorter days and less sun.

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