Application of the nonimaging fresnel lens to the mirror duct

摘要

The Mirror Duct can help to illuminate an otherwise relatively dark location with natural sunlight. The Mirror Duct itself is a reflecting tunnel of rectangular cross-section and any possible length. But the Sun moves relative to earth so that the daylighting is instability. Then we consider putting the non-Imaging Fresnel lens at the entrance of the Mirror Duct to gain its performance, and simulate the systems. Resulting we get basal data for daylighting.