Two-stage concentrator for solar radiation - has linear concentrator arranged above compound parabolic concentrator and forming given angle

摘要

The concentrator has two stages for concentrating solar radiation onto solar cells, and is tracked in the polar axis. A first concentrator placed above a second and forming a half angle theta2 of about 20 to 30 degrees. The first concentrator is linear and the second two-dimensional. The concentrators may comprise linear or rectangular fresnel lenses, e.g. made of glass. The first concentrator may be a parabolic reflector, and the second a compound parabolic concentrator (CPC). The half-angle theta2 is pref. 25.5 degrees. USE/ADVANTAGE - Increased concentration factor. Need only be tracked in polar (north-south) axis during day. Small dimensions.