Skylight
**History:**
– Skylights have been used in architecture since Ancient Roman times.
– Glazed closed skylights became popular during the Industrial Revolution.
– Mass production of skylights started in the mid-20th century.
– Energy conservation has been a key driver for skylight innovation.
– Efficiency rating systems have been developed for skylights.
**Description:**
– Skylight types include roof windows, unit skylights, TDDs, sloped glazing, and custom skylights.
– Skylights are used for daylighting, visual connection, and sustainable building practices.
– Fixed skylights consist of a structural frame and glazing infill.
– Operable skylights have hinged sashes for ventilation.
– Tubular daylight devices harvest and distribute sunlight effectively.
**Solar Architecture:**
– Skylights are widely used for daylighting in buildings.
– Daylighting can reduce lighting energy use by up to 80%.
– Toplighting combined with sidelighting maximizes efficiency.
– Modern glazing minimizes glare and maximizes sunlight capture.
– Skylights are 3-10 times more efficient than sidelighting.
**Materials:**
– Glass and plastic infill systems are common in skylights.
– Glass units use Low-E coatings for thermal performance.
– Plastic glazing materials like acrylic, polycarbonate, and copolyester are used in skylights and TDDs.
– Rating systems such as NFRC, U-factor, and SHGC are crucial for performance evaluation.
**Benefits:**
– Daylighting optimization in classrooms can improve student test scores.
– Skylights reduce electrical lighting use and energy costs.
– Skylights contribute to lowering environmental impacts.
– Balancing U-factor and SHGC values is essential for optimal performance.
– Automatic light sensing controls help maximize energy savings.
A skylight (sometimes called a rooflight) is a light-permitting structure or window, usually made of transparent or translucent glass, that forms all or part of the roof space of a building for daylighting and ventilation purposes.
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