The Study of Daylighting using the Mirror Duct (Part 2) - Study about improvement in lighting efficiency with a tracking type nonimaging Fresnel lens

摘要

There are some buildings where the Mirror Duct that is one of a daylighting system is adopted. When the introduction to a more common building is considered, there are some problems in the conventional mirror duct. They are the problems by the restrictions to cross-sectional form, and the absorption in the inside of a duct. So we suggest Condensed type receiver. The objective of this research is to evaluate the performance of the Mirror Duct with nonimaging Fresnel lens. As result of our ray tracing simulation, this system can carry the light for 1m with lowest optical loss. And we experimented and evaluated the lighting performance.