A new device for distributing concentrated sunlight in building interiors

Experimental analysis of a scaled, multi-aperture, light-pipe, daylighting system

“…Mirrors placed at the base of the duct reflect some light back up through the duct, thereby increasing the light output of the emitters. Whitehead et al (1984) developed side emitters that supplied light from a large scale 0.9m 2 prismatic hollow light-pipe into smaller prismatic duct sections running laterally across the ceiling void, feeding conventional luminaries. The system operated at an overall efficiency of around 30% (Whitehead et al, 1984).…”

“…Whitehead et al (1984) developed side emitters that supplied light from a large scale 0.9m 2 prismatic hollow light-pipe into smaller prismatic duct sections running laterally across the ceiling void, feeding conventional luminaries. The system operated at an overall efficiency of around 30% (Whitehead et al, 1984). In a simple variation of this system, light is deflected directly into the room through an aperture from a light shaft (Institut Catalan D'Energia Barcelona, 1999).…”

Design of an innovative and simplified polar heliostat for integration in buildings and urban environments

“…The need to improve the use of daylighting techniques inside buildings thus means that systems based on heliostats have been used in recent years to redirect solar light (Rosemann and Kaase, 2005;Whitehead et al, 1984;Wong et al, 2012). Kischkoweit-Lopin (2002) shows a general review of daylighting exploitation systems where it is emphasized that systems based on heliostats are the most complex.…”