|Veröffentlichungsdatum||13. Nov. 2008|
|Eingetragen||6. März 2008|
|Prioritätsdatum||6. März 2007|
|Veröffentlichungsnummer||043706, 12043706, US 2008/0276929 A1, US 2008/276929 A1, US 20080276929 A1, US 20080276929A1, US 2008276929 A1, US 2008276929A1, US-A1-20080276929, US-A1-2008276929, US2008/0276929A1, US2008/276929A1, US20080276929 A1, US20080276929A1, US2008276929 A1, US2008276929A1|
|Erfinder||Dave Gerwing, Ken Murray|
|Ursprünglich Bevollmächtigter||Dave Gerwing, Ken Murray|
|Zitat exportieren||BiBTeX, EndNote, RefMan|
|Referenziert von (13), Klassifizierungen (16), Juristische Ereignisse (1)|
|Externe Links: USPTO, USPTO-Zuordnung, Espacenet|
This is a non-provisional U.S. application claiming priority from U.S. Provisional Patent Application No. 60/893,275 filed on Mar. 6, 2007, the disclosure of which is incorporated herein by reference in its entirety.
The present invention relates to solar collectors, and in particular to solar collectors which collect and concentrate solar rays.
Solar collectors for collecting solar energy generally fall into one of two categories: concentrating and non-concentrating. Concentrating solar collectors typically comprise a reflector for reflecting and concentrating received solar radiation towards an absorber. The absorber may include a conduit for carrying a heat transfer fluid for absorbing solar thermal energy and/or an array of photovoltaic cells for converting solar energy into electrical energy. The reflector is either in the form of a circular dish with the focal position above the center of the dish, or a trough-like, parabolic reflector which produces a line focus along the length of the reflector. In the latter case, the absorber typically comprises a radiation absorbing tube positioned centrally above the reflector and extending along its length.
Focussing or concentrating solar collectors typically require some type of sun tracking mechanism and tracking control system to vary the orientation of the collector to maintain the focal position of the solar radiation of the absorber surface. Non-focusing solar collectors generally comprise flat, solar absorbing panels which are fixed in position and do not actively track the sun.
An example of a trough-like solar collector system is disclosed in WO 2005/090873. The solar collector comprises a parabolic trough-like reflector having a longitudinal absorber positioned above the reflector and mounted thereon by means of a central support upstanding from the reflector. The reflector includes spaced apart ribs fixed to the underside of the reflector panel to help maintain the shape of the reflective surface. The absorber comprises a longitudinal plate having a radiation absorbing surface which may include an array of solar cells mounted thereon. A conduit is positioned adjacent the back of the plate for transferring solar thermal energy into a heat transfer fluid. Transparent panels extend from each side of the absorber to opposed longitudinal edges of the reflector to protect the reflective surface from weathering and to provide additional structural rigidity.
According to an aspect of the present invention, there is provided a solar collector comprising a trough-like reflector for receiving solar rays and for concentrating the rays in a direction generally transverse to the length of the reflector between its ends, and concentrator means for receiving the concentrated rays from the trough-like reflector and for concentrating the rays in one or more of a direction generally along said length and a direction generally transverse to said length.
According to another aspect of the present invention, there is provided an asymmetric solar concentrating trough based system, having means for actively tracking the sun on two axes; elevation (1) with individual troughs and collectively with an array of troughs tracking on azimuth (2) with a primary (3) and secondary (4) mirror for concentrating the sun on two axes.
According to another aspect of the present invention, there is provided a symmetric solar concentrating trough based system, having means for actively tracking the sun on two axes; elevation (1) with individual troughs and collectively with an array of troughs tracking on azimuth (2) with a primary (3) and secondary (4) mirror for concentrating the sun on two axes.
According to another aspect of the present invention, there is provided a two stage reflective solar concentration system where a first primary optical concentration reflector (3) is a two dimensional symmetric or asymmetric parabolic trough and second optical concentration stage (4) is a three dimensional modified paraboloid; both designed in combination so as to provide a concentration ratio in the range from about 80 to about 10,000 suns, or more.
According to another aspect of the present invention, there is provided a two stage concentration system with a third reflective or refractive (e.g. pyramidal frustum) optic stage (5) designed to accept the concentrated sunlight rays (14) and mix them with multiple bounces so as to produce a substantially uniform illumination on the target surface within about ±10% to ±30% maximum average illumination levels.
According to another aspect of the present invention, there is provided a solar concentrating receiver wherein heat is carried away from the concentrated solar area (6) by heat transfer fluid (7) running longitudinally through the receiver in close proximity to the focal line (8) of the secondary 3D paraboloid (4).
According to another aspect of the present invention, there is provided a solar concentrator or receiver wherein a high efficiency multi-sun solar cell (9) is placed at the solar focus area (6) to simultaneously produce heat and electricity.
According to another aspect of the present invention, there is provided a solar concentrator receiver wherein a “cold” mirror (4) is used as the second stage mirror to remove solar radiation at least one of below about 400 nm and above about 700 nm, allowing substantially only the visible light (10) only to pass through and where a translucent (fiber) optic light conductor (13) is placed at or near the solar focus area (6) allowing the transmission of visible light into buildings and/or areas requiring light. The cold mirror prevents heat (infrared (IR) solar radiation) and plastic damaging (Ultraviolet (UV) Solar wave lengths) from entering the fiber optic light conductor (13), and acts in an analogous way to a band pass filter in the electronics field.)
According to another aspect of the present invention, there is provided a solar concentrating receiver wherein one or more translucent lens(es) (11, 12) (e.g. planar or focusing translucent plate(s)) are placed in the solar collection beam of light to remove the IR and/or UV solar radiation.
According to another aspect of the present invention, there is provided a solar concentrating receiver wherein either the cold mirror (4) or translucent lens (11, 12) are thermally interconnected to one or more UV and/or IR filters to efficiently and simultaneously capture the heat and focus the light into the fiber optic light conductor (13).
According to another aspect of the present invention, there is provided a solar concentrator receiver wherein one or more thermal collection path(s) are thermally insulated with a thermal insulating material, e.g. mineral wool or similar high temperature, preferably, non-moisture absorbing insulation.
According to another aspect of the present invention, there is provided a solar receiver wherein one or more of the fluid path extrusion (15) and the receiver cover (16) (if any) are continuous over the length of the primary mirror (3); and the secondary reflector or concentrator (4) and the secondary reflector cover (16) (if any) and the optical mixer (5) and optical mixer extrusion (17) are segmented in shorter sections so as to help keep precise alignment between the secondary reflector (4) and the mixer (5) during fluid path extrusion (15) heat up and cool down from about −40 to +100° C. for example, or any other operating temperature range.
In the above aspects of the invention, reference numbers in parentheses refer to features of the drawings, which are for illustrative purposes only and in no way limiting of the invention.
Examples of embodiments of the present invention will now be described with reference to the drawings, in which:
The primary reflector is shaped to concentrate the reflected radiation towards a focal line 21, which may be positioned in front of the secondary reflector or mirror 4, although in other embodiments, the focal line or position may be generally located behind the secondary reflector. The surface of the secondary reflector is curved also to concentrate the solar radiation in a first direction, e.g. x-direction shown by the arrow 22. The secondary mirror 4 is also curved in an orthogonal direction, along the z-direction (into the page of
In a refractive version of the distribution device, the device may comprise a prism of solid translucent material, e.g. glass or other suitable material and have any suitable shape as described above.
A means may be provided for filtering one or more parts of the solar spectrum so that only selected wavelengths are admitted to the optical waveguide or other light receiver. Such means may include any one or more of a coating on the primary and/or secondary reflectors 3, 4 which selectively absorb certain wavelengths and reflect others, a lens positioned between the primary and secondary reflectors 3, 4, a lens positioned between the secondary reflector and the entrance aperture of the distribution device 5 and/or a coating on the reflective surfaces of the distribution device or a lens between the entrance aperture and the bottom portion of the distribution device.
In some embodiments, the receiver may include a combination of a fluid conduit and one or more solar cells, without any optical waveguides. In another embodiment, the receiver may comprise a combination of a conduit and one or more optical waveguides in the absence of any solar cells, and in another embodiment, the receiver may include a combination of a conduit, one or more solar cells and one or more optical waveguides. In other embodiments, the receiver may include one or more solar cells in the absence of any conduit or optical waveguide and in other embodiments, the receiver may include one or more optical waveguides in the absence of any conduit or solar cells.
In one embodiment, the housing panels and the fluid conduit may comprise extrusions which run continuously from one end to the other of a solar collector. In one embodiment, and with reference to
In embodiments of the solar collector, any one or more components may comprise a suitable metallic material, for example aluminum or any other suitable material. Where differential thermal contraction and expansion is an important consideration, components may comprise the same or similar material.
Other aspects and embodiments of the invention may comprise any one or more features disclosed herein in combination with any one or more features disclosed herein. In any aspect or embodiment of the invention, any one or more features may be omitted altogether or may be substituted by an equivalent or variant thereof.
Numerous modifications to the embodiments disclosed herein will be apparent to those skilled in the art.
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|Unternehmensklassifikation||F24J2/52, F24J2/5243, F24J2/5203, F24J2/18, F24J2/542, Y02E10/45, F24J2/067, F24J2/14, F24J2002/5479, F24J2/07, Y02E10/47|
|Europäische Klassifikation||F24J2/18, F24J2/14|
|12. Juni 2008||AS||Assignment|
Owner name: MENOVA ENERGY INC., CANADA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GERWING, DAVE;MURRAY, KEN;REEL/FRAME:021092/0486;SIGNINGDATES FROM 20080414 TO 20080416