Solar energy concentrator

• US 7,672,549 B2
• Filed: 09/10/2007
• Issued: 03/02/2010
• Est. Priority Date: 09/10/2007
• Status: Active Grant

• Current Assignee: Banyan Energy, Inc.
• Original Assignee: Banyan Energy, Inc.
• Inventors: Ghosh, Shondip, Schultz, David Sheldon
• Primary Examiner(s): HEALY, BRIAN
• Application Number:
  US11/852,854
• Publication Number:
  US 20090064993A1
• Time in Patent Office: 904 Days
• Field of Search: 385/900, 385/901, 385/146, 385/134, 385/100, 385/36, 385/31, 385/33, 126/634, 126/684, 126/685, 136/259
• US Class Current: 385/31
• CPC Class Codes: F24S 23/12 Light guides
• CPC Class Codes: F24S 23/31 having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: Y02E 10/40 Solar thermal energy, e.g. solar towers
• CPC Class Codes: Y10S 385/90 Solar collector or transmitter

Abstract

A solar concentrator having a concentrator element for collecting input light, a reflective component with a plurality of incremental steps for receiving the light and also for redirecting the light, and a waveguide including a plurality of incremental portions enabling collection and concentration of the light.

Claims

1. A solar concentrator, comprising:

a plurality of optical elements disposed adjacent each other with each of the plurality of optical elements including;

(a) a concentrator element for collecting and repositioning input light; and

(b) an associated redirecting element which is associated with and separate from the concentrator element for receiving the light from the concentrator element wherein the concentrating element of each of the plurality of optical elements is separated from at least one portion of the associated redirecting element by a layer within which the light does not undergo a repositioning change of direction and the layer being contiguous between at least a portion of each of the associated redirecting elements; and

the solar concentrator further including;

a stepped waveguide for receiving the light from the at least one portion of the associated redirecting element which is constructed to reposition the light into the stepped waveguide for accumulation.

2. The solar concentrator as defined in claim 1 wherein the associated redirecting element is disposed opposite the concentrator element which is shaped for repositioning of an input light edge ray to substantially at a perpendicular angle relative to the input light edge ray and the associated redirecting element being shaped to receive the light edge ray from the concentrating element to reposition the light edge ray at a second substantially perpendicular angle.

3. The solar concentrator as defined in claim 2 wherein the light edge ray first repositioned by the light redirecting element is further repositioned by the at least one portion of the associated redirecting element at yet another substantially perpendicular angle.

4. The solar concentrator as defined in claim 1 wherein at least part of the associated redirecting element comprises a discontinuous surface.

5. The solar concentrator as defined in claim 1 wherein at least part of the associated redirecting element is physically discontinuously disposed apart from the concentrator element, thereby enabling separate manufacture of the concentrator element from at least one part of the associated redirecting element.

6. The solar concentrator as defined in claim 5 wherein the plurality of optical elements and the stepped waveguide are disposed in a vertical stack of physically separate components, thereby enabling direct assembly of separate parts comprising the solar concentrator.

7. The solar concentrator as defined in claim 1 wherein the at least one portion of the associated redirecting element comprises an entry element into the stepped waveguide.

8. The solar concentrator as defined in claim 1 wherein at least a portion of the associated redirecting element is separate from the stepped waveguide.

9. The solar concentrator as defined in claim 1 wherein the stepped waveguide is comprised of incremental stepped sections, the step height being about the height of the concentrated light being input into the stepped waveguide at that section.

10. The solar concentrator as defined in claim 1 wherein the stepped waveguide has upper and lower horizontal surfaces which are substantially parallel.

11. The solar concentrator as defined in claim 1 wherein the plurality of optical elements input light to the stepped waveguide to provide aggregated light and the concentrator further includes a receiver which collects the aggregated light.

12. The solar concentrator as defined in claim 1 wherein the concentrator element is selected from the group consisting of a spherical lens, an aspherical lens, a Fresnel lens, a cylindrical lens, a tailored shape lens, a parabolic surface, an elliptical surface, a hyperbolic surface, an arc and a tailored shape reflective surface.

13. The solar concentrator as defined in claim 1 wherein the optical elements are disposed at least one of above the waveguide and below the waveguide.

14. The solar concentrator as defined in claim 1 wherein the associated redirecting element is selected from the group of a flat reflective surface, a parabolic surface, an elliptical surface, a hyperbolic surface, an arc and a refractive component selected from the group of a spherical component, an aspherical component, a Fresnel lens and a tailored shape.

15. The solar concentrator as defined in claim 1 wherein the concentrator element comprises a refracting lens element such that the light achieves total internal reflection by the redirecting element.

16. The solar concentrator as defined in claim 1 where the solar concentrator is linearly symmetric.

17. The solar concentrator as defined in claim 1 where the solar concentrator is rotationally symmetric.

18. A solar concentrator, comprising:

a plurality of optical elements disposed adjacent each other with each of the plurality of optical elements including;

(a) a refractive concentrator element for collecting and repositioning input light; and

(b) an associated redirecting element which is associated with and separate from the concentrator element for receiving the light from the concentrator element wherein the concentrating element of each of the plurality of optical elements is separated from at least one portion of the associated redirecting element by a layer within which the light does not undergo a repositioning change of direction and the layer being contiguous between at least a portion of each of the associated redirecting elements; and

the solar concentrator further including;

a stepped waveguide for receiving the light from the at least one portion of the associated redirecting element which is constructed to reposition the light into the stepped waveguide for accumulation.

19. A solar concentrator, comprising:

a plurality of optical elements disposed adjacent each other with each of the plurality of optical elements including;

(a) a concentrator element for collecting and repositioning input light; and

(b) a redirecting element comprised of (1) a first redirecting element portion receiving repositioned light from the concentrator and having a discontinuous spatial surface and disposed substantially opposed to the concentrator element; and

the first redirecting element further repositioning the light; and

(2) a second redirecting element portion that receives the repositioned light from the first redirecting element and further repositions the light, wherein the redirecting element includes a contiguous connection between at least a portion of each of the adjacent redirecting elements with the light avoiding repositioning within the contiguous connection; and

the solar concentrator further including;

a stepped waveguide physically separated from the concentrator element and the waveguide for receiving the repositioned light from the second redirecting element portion, thereby enabling vertical stacking of separately manufactured parts of the solar concentrator.

20. The solar concentrator as defined in claim 19 wherein at least a portion of the redirecting element is disposed opposite the concentrator element and the concentrating element being shaped for repositioning of an input light edge ray to substantially a perpendicular angle relative to the input light edge ray and at least a portion of the redirecting element shaped to receive the light edge ray from the concentrating element to reposition the light edge ray at a second substantially perpendicular angle.

21. The solar concentrator as defined in claim 19 wherein the light edge ray first repositioned by the light redirecting element is further repositioned by the at least one portion of the redirecting element at yet another substantially perpendicular angle.

22. The solar concentrator as defined in claim 19 wherein the second redirecting element comprises an entry element into the waveguide.

23. The solar concentrator as defined in claim 19 wherein the waveguide is comprised of incremental stepped sections, the step height being about the height of the concentrated light being input into the waveguide at an input section.

24. The solar concentrator as defined in claim 19 wherein the concentrator element of each of the plurality of optical elements is separated from the second redirecting element by a layer within which the repositioned light does not undergo a change of direction.

25. The solar concentrator as defined in claim 19 wherein a lower surface of the concentrator element and the first redirecting element and an upper surface of the waveguide are substantially parallel to each other.

26. The solar concentrator as defined in claim 19 wherein the plurality of optical elements and the waveguide are disposed in a vertical stack of physically separate components, thereby enabling direct assembly of separate parts comprising the solar concentrator.

27. The solar concentrator as defined in claim 19 wherein the concentrating element of each of the plurality of optical elements is separated from at least part of the redirecting element by a vertical layer within which the light does not undergo a repositioning charge of direction.

28. The solar concentrator as defined in claim 19 wherein the plurality of optical elements provide aggregated light to the waveguide and the concentrator further includes a receiver which collects the aggregated light.

29. The solar concentrator as defined in claim 19 wherein the concentrator element is selected from the group consisting of a spherical lens, an aspherical lens, a Fresnel lens, a cylindrical lens, a tailored shape lens, a parabolic surface, an elliptical surface, a hyperbolic surface, an arc and a tailored shape reflective surface.

30. The solar concentrator as defined in claim 19 wherein the redirecting element is selected from the group of a flat reflective surface, a parabolic surface, an elliptical surface, a hyperbolic surface, an arc and a refractive component selected from the group of a spherical component, an aspherical component, a Fresnel lens and a tailored shape.

31. A solar concentrator comprising:

a plurality of optical elements disposed adjacent each other with each of the plurality of optical elements including a concentrating element comprised of a combination of (1) a surface between a high index material and a low index material enabling refraction of input light and (2) a parabolic reflective surface which repositions the input light with the combination outputting the light without the light being repositioned more than once by the parabolic reflective surface;

a waveguide comprised of a plurality of portions with each of the portions associated with a corresponding one of the concentrating elements, each of the waveguide portion further having a step feature associated with receiving the output light from the concentrating element and the waveguide including top and bottom walls which are substantially parallel to each other, thereby preserving concentration of the light for delivery to a receiver.

32. A solar concentrator, comprising:

a plurality of optical elements disposed adjacent each other with each of the plurality of optical elements including a concentrator element for collecting and repositioning input light; and

the solar concentrator further including;

a stepped waveguide comprised of a plurality of portions with each of the portions associated with a corresponding one of the concentrating elements, each of the waveguide portion further having a step feature associated with receiving the output light from the concentrating element;

wherein the plurality of optical elements and the waveguide each form contiguous horizontal layers disposed in a vertical stack.