HORIZONTAL SHADING DEVICES – OVERHANGS
This diagram illustrates, the basic concept is that an overhang can be positioned to totally allow low winter sun in the entire window while completely shading theentire window from summer sun. The design calculation is performed over a certain period of mid-summer and a certain period of mid-winter, typically a month or two on either side of the two solstices. The calculation is also performed only for a certain period during the day, typically near solar noon since that is when it’s most important to increase solar gain in the winter and reduce gain in the summer (because the sun is most intense then). In fact, it is not usually possible to design a horizontal overhang that works in the early morning or late afternoon because the sun is low in the sky in both the summer and winter.
These are placed horizontally in…
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