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Hybrid solar lighting (HSL) or hybrid lighting systems combine the use of solar with artificial light for interior illumination by channelling sunlight through fiber optic cable bundles to provide solar light into rooms without windows or skylights, and by supplementing this natural light with artificial light—typically LED—as required. [1]
The effective collection area of a flat-panel solar collector varies with the cosine of the misalignment of the panel with the Sun.. Sunlight has two components: the "direct beam" that carries about 90% of the solar energy [6] [7] and the "diffuse sunlight" that carries the remainder – the diffuse portion is the blue sky on a clear day, and is a larger proportion of the total on cloudy days.
By 1917, the number of incandescent filament lamps used in street lighting had reached 1,389,000 across the United States, while the number of arc lamps had started to decline. [1] In 1919, San Francisco introduced tungsten bulbs on Van Ness Avenue, between Vallejo and Market Street, replacing gas mantles and arc lamps. [1]
Dover Sun House was one of the world's first solar-heated houses. It was designed by architect Eleanor Raymond and had a heating system developed by physicist Mária Telkes . In 1948, Mária Telkes and architect Eleanor Raymond began working on the Dover Sun House. [ 2 ]
MIT Solar House #1 The following buildings are of significance in pioneering the use of solar powered building design: MIT Solar House #1, Massachusetts, United States (Hoyt C. Hottel & others, 1939) Howard Sloan House, Glenview, Illinois, United States (George Fred Keck, 1940) "Solar Hemicycle", near Madison, Wisconsin, United States (Frank Lloyd Wright, 1944) Löf House, Boulder, Colorado ...
A double envelope house is a passive solar house design which collects solar energy in a solarium and passively allows the warm air to circulate around the house between two sets of walls, a double building envelope. This design is from 1975 by Lee Porter Butler in the United States.
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