The aim of the present study is the proposal of a novel tracking mirror system for the daylighting of deep interior spaces, such as commercial buildings, underground railway stations, parkings, etc.. The analytical approach demonstrates that it is possible to supply an acceptable workplane illuminance for 6/8 hours per day during the year in southern Italy. The experimental data, obtained by means of a physical model, support the theoretical analysis. Benefits in terms of energy savings and illuminance level, especially in clear sky conditions, are outlined.
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