Solar concentrator

Abstract

A solar concentrator comprises an incidence surface, a first reflective curved surface corresponding to the incidence surface, a second reflective curved surface disposed in a center part of the incidence surface, and a concentrating part disposed in a center part of the first reflective curved surface and corresponding to the second reflective curved surface, wherein the incidence surface, the first reflective curved surface, the second reflective curved surface, and the concentrator include a substantially same material from each other.

1 . A solar concentrator comprising:
 an incidence surface;   a first reflective curved surface corresponding to the incidence surface;   a second reflective curved surface disposed in a center part of the incidence surface; and   a concentrating part disposed in a center part of the first reflective curved surface and corresponding to the second reflective curved surface,   wherein the incidence surface, the first reflective curved surface, the second reflective curved surface, and the concentrator include a substantially same material from each other.   
     
     
         2 . The solar concentrator of  claim 1 , wherein an outer side of the first reflective curved surface is a reflective surface. 
     
     
         3 . The solar concentrator of  claim 1 , wherein the center part of the incidence surface is a concave portion, and an outer side of the concave portion is a reflective surface. 
     
     
         4 . The solar concentrator of  claim 1 , wherein the first reflective curved surface has a curved surface which reflects light transmitted into the incidence surface to the second reflective curved surface. 
     
     
         5 . The solar concentrator of  claim 4 , wherein the second reflective curved surface has a curved surface which reflects the transmitted light to the concentrating part. 
     
     
         6 . The solar concentrator of  claim 1 , wherein the concentrating part comprises a concentrating part incidence surface, a concentrating part emission surface, and a total reflective surface connecting the concentrating part incidence surface to the concentrating part emission surface. 
     
     
         7 . The solar concentrator of  claim 6 , wherein the concentrating part incidence surface has a greater area than an area of the concentrating part emission surface. 
     
     
         8 . The solar concentrator of  claim 7 , wherein the total reflective surface is substantially tilted with respect to a center axis of the concentrating part. 
     
     
         9 . The solar concentrator of  claim 8 , wherein the first reflective curved surface is connected to the concentrating part incidence surface through an inner surface. 
     
     
         10 . The solar concentrator of  claim 9 , wherein the inner surface is substantially parallel to the center axis of the concentrating part. 
     
     
         11 . The solar concentrator of  claim 9 , wherein the inner surface is substantially symmetrical with the total reflective surface about a plane substantially parallel to the center axis of the concentrating part. 
     
     
         12 . The solar concentrator of  claim 6 , wherein the concentrating part emission surface is positioned higher than a lowest part of the first reflective curved surface when the incidence surface is positioned higher than the first reflective curved surface. 
     
     
         13 . The solar concentrator of  claim 1 , wherein the incidence surface is connected to the first reflective curved surface through a side surface. 
     
     
         14 . The solar concentrator of  claim 13 , wherein the side surface has four surfaces, and each of the four surfaces is substantially parallel to the center axis of the solar concentrator. 
     
     
         15 . The solar concentrator of  claim 1 , wherein the concentrating part is disposed such that a height of the concentrating part allows a passage of light reflected from the first reflective curved surface to the second reflective curved surface. 
     
     
         16 . The solar concentrator of  claim 1 , wherein an amount of solar light emitted from the solar concentrator though the concentrating part is more than about 80% of all light incident to the incidence surface.