Two-Part Solar Energy Collection System With Replaceable Solar Collector Component

• US 20100206357A1
• Filed: 11/03/2009
• Published: 08/19/2010
• Est. Priority Date: 02/18/2009
• Status: Abandoned Application

• Current Assignee: Palo Alto Research Center, Inc. (Xerox Holdings Corp.)
• Original Assignee: Palo Alto Research Center, Inc. (Xerox Holdings Corp.)
• Inventors: Maeda, Patrick Y., Littau, Karl A., Cheung, Patrick C.
• Application Number:
  US12/611,873
• Publication Number:
  US 20100206357A1
• Time in Patent Office: Days
• US Class Current: 136/246
• CPC Class Codes: F24S 2020/10 Solar modules layout; Modular arrangements
• CPC Class Codes: F24S 23/74 with trough-shaped or cylindro-parabolic reflective surfaces
• CPC Class Codes: F24S 30/422 Vertical axis
• CPC Class Codes: H01L 31/0547 comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
• CPC Class Codes: H02S 20/23 specially adapted for roof structures
• CPC Class Codes: H02S 20/32 specially adapted for solar tracking
• CPC Class Codes: H02S 40/22 Light-reflecting or light-concentrating means directly associated with the PV cell or integrated with the PV cell H01L31/054
• CPC Class Codes: Y02B 10/10 Photovoltaic [PV]
• CPC Class Codes: Y02B 10/20 Solar thermal
• CPC Class Codes: Y02E 10/40 Solar thermal energy, e.g. solar towers
• CPC Class Codes: Y02E 10/47 Mountings or tracking
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

A two-part solar energy collection system for installation on a planar support surface (e.g., a rooftop) includes a permanent positioning component including a base structure and a replaceable solar collector component including solar energy collection elements fixedly mounted on a support frame. Each collection element includes an optical element arranged to focus solar radiation onto a focal line, and a linearly-arranged solar energy collector (e.g., PV cells) fixedly maintained on the focal line. The replaceable solar collector component is secured to a rotating platform of the base structure such that the focal lines of the solar energy collection elements are maintained in a plane that is substantially parallel to the support surface, and the rotating platform and replaceable solar collector component are collectively pivoted by a positioning system around a rotational axis to align the PV cells) parallel to the received sunlight beams.

Claims

1. A two-part solar energy collection system for installation on a planar support surface, the two-part solar energy collection system comprising:

a permanent positioning component including;

a base structure including a frame and a rotating platform rotatably disposed on the frame such that the rotating platform is rotatable around a rotational axis relative to the frame, and

a rotational positioning system including means for adjusting the rotational angle of the rotating platform around the rotational axis; and

a replaceable solar collector component including one or more solar energy collection elements fixedly mounted on a support frame, wherein each of the one or more solar energy collection elements includes an optical element arranged to focus solar radiation onto a focal line, and a linearly-arranged solar energy collector fixedly maintained on the focal line,

wherein, when the frame of the base structure is operably secured to the planar support surface, the rotational axis is maintained substantially perpendicular to said support surface, and

wherein, when the support frame of the replaceable solar collector component is operably secured to the rotating platform, the focal line of the one or more solar energy collection elements is maintained in a plane that is substantially parallel to the planar support surface while the rotating platform and replaceable solar collector component are collectively rotated around the rotational axis.

2. The two-part solar energy collection system according to claim 1, wherein rotational positioning system comprises a tracking system including means for detecting a position of the sun relative to the one or more solar energy collection elements, and means for rotating the rotating platform such that the focal line is parallel to solar beams generated by the sun that are directed onto the one or more solar energy collection elements.

3. The two-part solar energy collection system according to claim 2, wherein said tracking system including means for controlling a rotational position of the one or more solar energy collection elements such that:

during a sunrise time period, the focal line is aligned in a first generally east-west direction,

during a midday time period, the focal line is aligned in a generally north-south direction, and

during a sunset time period, the focal line is aligned in a second generally east-west direction.

4. The two-part solar energy collection system according to claim 1, wherein the optical element of the one or more solar energy collection elements utilizes one of reflective optics and refractive optics to concentrate solar radiation onto the focal line.

5. The two-part solar energy collection system according to claim 4, wherein the optical element of the one or more solar energy collection elements comprises a trough reflector.

6. The two-part solar energy collection system according to claim 4, wherein the optical element of the one or more solar energy collection elements comprises:

a single-piece, solid optical element having a predominately flat upper aperture surface and a convex lower surface disposed opposite to the upper aperture surface; and

a mirror that is conformally disposed on the convex lower surface, wherein the convex lower surface and mirror are arranged such that sunlight passing through the flat upper aperture surface is reflected and focused by the mirror onto said focal line,

wherein the linearly-arranged solar energy collector is fixedly disposed on the focal line to receive the focused light reflected by the mirror.

7. The two-part solar energy collection system according to claim 6,

wherein the focal line substantially coincides with a linear section of the upper aperture surface, and

wherein the linearly-arranged solar energy collector comprises a serially-connected plurality of photovoltaic cells fixedly mounted on the linear section of the upper aperture surface.

8. The two-part solar energy collection system according to claim 1,

wherein said replaceable solar collector component comprises a plurality of solar energy collection elements fixedly mounted on said support frame, wherein each of the plurality of solar energy collection elements includes an associated optical element arranged to focus solar radiation onto an associated focal line, and an associated linearly-arranged solar energy collector fixedly maintained on said associated focal line, and

wherein the associated linearly-arranged solar energy collectors of the plurality of solar energy collection elements are fixedly arranged on said support frame such that said associated focal lines are parallel and define a single plane.

9. The two-part solar energy collection system according to claim 8, wherein each said optical element of said plurality of solar energy collection elements comprises:

a single-piece, solid optical element having a predominately flat upper aperture surface and a convex lower surface disposed opposite to the upper aperture surface;

a mirror that is conformally disposed on the convex lower surface, wherein the convex lower surface and mirror are arranged such that sunlight passing through the flat upper aperture surface is reflected and focused by the mirror onto said focal line; and

a linearly-arranged solar energy collector fixedly disposed on the focal line to receive the focused light reflected by the mirror.

10. The two-part solar energy collection system according to claim 9, wherein said solid optical element of each of said plurality of solar energy collection elements has a common length.

11. The two-part solar energy collection system according to claim 9, wherein said solid optical element of each of said plurality of solar energy collection elements has a common length.

12. The two-part solar energy collection system according to claim 11, wherein said replaceable solar collector component further comprises a plurality of sub-assembly units, each of the plurality of sub-assembly units including a base structure and a predetermined number of said plurality of said solar energy collection elements fixedly attached to said base structure, wherein said plurality of sub-assembly units are mounted on said support frame.

13. The two-part solar energy collection system according to claim 12,

wherein said plurality of sub-assembly units are mounted on said support frame such that an end of each of the plurality of solar energy collection elements is disposed along a central linear region of the support frame,

wherein said replaceable solar collector component includes a conduit disposed on the central linear region of the support frame, wherein the conduit is electrically connected to the linearly-arranged solar energy collector of each of the plurality of solar energy collection elements.

14. The two-part solar energy collection system according to claim 13,

wherein the positioning system further comprises a power transfer system including a connector and a first cable coupled to the first connector for transferring power from the plurality of solar energy collectors to a designated load circuit, and

wherein the first and second wires are coupled to the connector.

15. The two-part solar energy collection system according to claim 12, wherein the base structure of each of the plurality of sub-assembly units comprises a series of curved grooves, wherein each of the predetermined number of said plurality of said solar energy collection elements is received in one of said series of grooves.

16. The two-part solar energy collection system according to claim 12, wherein each of the plurality of sub-assembly units further comprises an elongated heat sink connected to the optical element of each of the plurality of solar energy collection elements and disposed over the associated solar energy collectors of said each solar energy collection element.

17. A permanent positioning component for a two-part solar energy collection system including both the permanent positioning component and a replaceable solar collector component that is removably connectable to the permanent positioning component, the replaceable solar collector component including one or more solar energy collection elements fixedly mounted on a support frame, wherein each of the one or more solar energy collection elements includes an optical element arranged to focus solar radiation onto a focal line, and a linearly-arranged solar energy collector fixedly maintained on the focal line, wherein the permanent positioning component comprises:

a base structure including a frame and a rotating platform rotatably disposed on the frame such that the rotating platform is rotatable around a rotational axis relative to the frame, and

a rotational positioning system including means for adjusting the rotational angle of the rotating platform around the rotational axis; and

wherein, when the frame of the base structure is operably secured to the planar support surface, the rotational axis is maintained substantially perpendicular to said support surface, and

wherein, when the support frame of the replaceable solar collector component is operably secured to the rotating platform, the focal line of the one or more solar energy collection elements is maintained in a plane that is substantially parallel to the planar support surface while the rotating platform and replaceable solar collector component are collectively rotated around the rotational axis.

18. A replaceable solar collector component for a two-part solar energy collection system including both a permanent positioning component and the replaceable solar collector component, wherein the a permanent positioning component includes a base structure including a frame and a rotating platform rotatably disposed on the frame such that the rotating platform is rotatable around a rotational axis relative to the frame, and a rotational positioning system including means for adjusting the rotational angle of the rotating platform around the rotational axis, wherein the replaceable solar collector component comprises:

a support frame;

one or more solar energy collection elements fixedly mounted on the support frame, wherein each of the one or more solar energy collection elements includes an optical element arranged to focus solar radiation onto a focal line, and a linearly-arranged solar energy collector fixedly maintained on the focal line,

wherein, when the support frame of the replaceable solar collector component is operably secured to the rotating platform, the focal line of the one or more solar energy collection elements is maintained in a plane that is substantially parallel to the planar support surface while the rotating platform and replaceable solar collector component are collectively rotated around the rotational axis.