Finally, another area of solar energy is related to passive solar buildings. The term passive system is applied to buildings that include, as integral parts of the building, elements that admit, absorb, store, and release solar energy and thus reduce the need for auxiliary energy for comfort heating. These elements have to do with the correct orientation of buildings, the correct sizing of openings, the use of overhangs and other shading devices, and the use of insulation and thermal mass. For many years however, many of these were used based mostly on experience. These are investigated in Chapter 6 of this book.
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