| 摘要 |
PURPOSE:To obtain a solar heat collector, wherein a structure thereof is simple, a heat-loss therein is small and a beam collecting effeciency may be improved, by providing along a longitudinal direction of heat collecting tubes with line focus type Fresnel lenses above the tubes and line focus type Fresnel reflectors below the tubes respectively. CONSTITUTION:Fresnel lenses 2, 3 are arranged in parallel with and above as well as below a heat collecting tube 1 provided in parallel with an aixs X. The upper lens 2 is a convex lens and solar beams are refracted while the lower lens 3 is a convex lens and is coated with a reflecting film 4 in order to refract the beams two times. According to this method, a part of the solar beams are collected into the heat collecting tube 1 after passing through and being refracted by the Fresnel lens 2 as shown by arrow signs a, while another part of the solar beams are refracted in the Fresnel lens 3 having the reflecting film coating on the lower surface thereof and refracted further, then, are collected into the heat collecting tube 1 as shown by arrow signs b, at respective collecting tubes 1, and thus, an efficient beam collections may be effected. |
