| 摘要 |
An annular convex-concave lens mounted near the periphery of the circular roof of a circular building, a circular conical beam concentrator mounted below the roof at the center of the building, and a vertical metal heat duct mounted inside the beam concentrator. The annular lens receives and refracts a convergent conical incipient beam of diffused sunlight, forming a concentrated convergent lateral beam in the horizontal plane. The convergent lateral beam is projected inward to the beam concentrater which refracts the beam twice more and emits a thin convergent lateral beam onto the heat duct. The heat absorbed by the heat duct is distributed by air flowing through the duct to other parts of the building.
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