FIELD: solar energy engineering. SUBSTANCE: device has concentrator in form of truncated cones located concentrically with their large bases directed towards incident radiant flux; device is also provided with energy receiver located in focus of side of lesser bases of cones; both surfaces of cones but for outer peripheral cone are mirror surfaces. The Invention gives theoretical basis for selection of parameters for device. EFFECT: increased degree of concentration of radiant energy at reduced losses of energy. 8 dwg
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