| 摘要 |
PROBLEM TO BE SOLVED: To constantly allow a sufficient amount of direct solar radiation indoors in the fixes direction regardless of the position of the sun. SOLUTION: In a solar radiation utilization system which utilizes solar radiation by allowing the radiation indoors through a duct 16, a plurality of approximately circular Fresnel prisms 13a, 13b are installed at a predetermined distance and opposite to each other inside the duct 16, and motors 15a, 15b for rotating the Fresnel prisms are mounted on the edges 14a, 14b of the approximately circular Fresnel prisms 13a, 13b. |
