| 摘要 |
PURPOSE:To contrive to miniaturize a tracking mechanism by disposing a reflecting mirror for reflecting solar rays toward a condenser lens arranged in elevation-angle changeable form and providing a tracking mechanism operating the elevation angle. CONSTITUTION:A sealed heat-insulating housing 3 is fixed to a stand 8 under the state in which a Fresnel lens 1 is positioned at a section lower than a heat collecting pipe 2 and at a downward attitude while a plane mirror 4 for reflecting solar rays toward the Fresnel lens 1 is disposed in elevation-angle changeable shape by oscillation around a shaft 5 in the east and west direction, and the tracking mechanism 6 varying, fixing and operating the elevation angle so that an angle of incidence to the Fresnel lens 1 of reflected rays is made constant or approximately constant regardless of the change of solar altitude in the daytime at every one week unit is provided. Relative positions between the Fresnel lens 1 and the tracking reflecting plane mirror 4 may be determined so that solar rays (a) going pass by the southern end of the lens 1 at the summer solstice southing are projected to the northern end of the plane mirror 4. |
