title: Nonimaging secondary concentrators for large rim angle parabolic troughs with tubular absorbers.
abstract: For parabolic trough solar collectors with tubular absorbers, we design new tailored secondary concentrators. The design is applicable for any rim angle of a parabolic reflector. With the secondary, the concentration can be increased by a factor of more than 2 with a compact secondary reflector consisting of a single piece, even for the important case of a rim angle of 90 deg. The parabolic reflector can be used without changes; the reduced absorber is still tubular but smaller than the original absorber and slightly displaced toward the primary.
authors.forename: H
authors.initials: H
authors.lastname: Ries
authors.forename: W
authors.initials: W
authors.lastname: Spirkl