| 摘要 |
PURPOSE:To perform effective heat collection by installing a stright Fresnel-type prism plate on the inclined front surface of a triangle-tubular case installed, a reflecting surface on the lower surface thereof, and a heat-collecting surface on the inclined back surface thereof. CONSTITUTION:The tubular case 1 having a triangular cross section is installed in such a manner that one side surface thereof becomes the inclined front surface 4 and the other two side surfaces become the lower surface 2 and back surface 5 thereof respectively, and the straight Fresnel-type prism plate 6 which is a light-receiving surface A is provided on the inclined front surface 4, while the reflecting surface B and the heat-collecting surface C are provided on the lower surface and the inclined back surface 5 respectively. By this constitution, the area of the heat-collecting surface C in relation to the light-receiving surface A can be reduced and sunrays falling on the broad light-receiving surface A can be condensed in application thereof on the narrow heat-collecting surface C, whereby effective heat collection can be performed. |
