The overall efficiency of a system including a solar paraboloidal concentrator augmented by a new type of nonimaging second stage concentrator (shaped like the bell of a trumpet) and coupled to a heat engine is investigated. Typically, a relative increase of 10 per cent in system efficiency was found due to the second stage. © 1983.
Kritchman, E. (1983). Solar thermal engine systems using two stage concentrators. Solar Energy, 31(5), 449–453. https://doi.org/10.1016/0038-092X(83)90048-8