WO1996020376A1 - Nonimaging solar collector - Google Patents

Nonimaging solar collector Download PDF

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Publication number
WO1996020376A1
WO1996020376A1 PCT/US1995/016867 US9516867W WO9620376A1 WO 1996020376 A1 WO1996020376 A1 WO 1996020376A1 US 9516867 W US9516867 W US 9516867W WO 9620376 A1 WO9620376 A1 WO 9620376A1
Authority
WO
WIPO (PCT)
Prior art keywords
solar collector
absorber
outer housing
solar
collector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US1995/016867
Other languages
French (fr)
Inventor
Roland Winston
Joseph O'gallagher
David G. Jenkins
William Duff
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Solar Enterprises International LLC
Original Assignee
Solar Enterprises International LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Solar Enterprises International LLC filed Critical Solar Enterprises International LLC
Priority to AU47423/96A priority Critical patent/AU705952B2/en
Priority to JP52057796A priority patent/JP3880621B2/en
Priority to EP95944654A priority patent/EP0797751B1/en
Priority to DE69533091T priority patent/DE69533091T2/en
Publication of WO1996020376A1 publication Critical patent/WO1996020376A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
    • F24S10/45—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors the enclosure being cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S10/00—Solar heat collectors using working fluids
    • F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
    • F24S10/75—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits with enlarged surfaces, e.g. with protrusions or corrugations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/80—Arrangements for concentrating solar-rays for solar heat collectors with reflectors having discontinuous faces
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/44—Heat exchange systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S126/00—Stoves and furnaces
    • Y10S126/907—Absorber coating

Definitions

  • The, present invention is concerned with a nonimaging concentrator for light. More particularly, the invention is concerned with a solar energy concentrator or collector having an absorber concentrically disposed within a glass housing enabling nonimaging light concentration, such as an evacuated cylindrical reflector tube.
  • This absorber geometry also includes a gap loss reduction V groove which is positioned in a complementary manner relative to a wedge shaped heat conductor fin coupled to the absorber.
  • Nonimaging concentrators and their advantages are well known in the art (see, for example, U.S. Pat. Nos. 3,957,031; 4,002,499; 4,003,638; 4,230,095; 4,387,961; 4,359,265; and 5,289,356 incorporated by reference herein).
  • the device is constructed using a given absorber shape, usually a cylindrical tube, and then the appropriate nonimaging reflector is designed. This emphasis was therefore primarily on developing new reflector designs to optimize collector efficiency.
  • There has recently been made available new types of high performance absorber materials which can even be disposed on flexible substrates. These absorbers have an absorbtance typically greater than 90% over the solar spectrum, while the hemispherical emittance at operating temperatures is quite low.
  • FIGURE 1 illustrates a prior art solar collector with a flat fin conductor
  • FIGURE 2 illustrates a prior art nonimaging solar collector of 35° acceptance angle with an absorber disposed noncentrically within a cusp shaped reflector
  • FIGURE 3A illustrates a cross-sectional view along 3A-3A on FIG. 3D o nonimaging solar collector having an absorber concentrically disposed within a cylindrical reflector with a N-groove gap loss suppresser and the absorber furthe includes a coupled heat conductor fin having a conically shaped cross section;
  • FIG. 3B shows a ray trace for the collector of FIG. 3 A;
  • FIG. 3C illustrates a perspective view of the solar collector of FIG. 3 A;
  • FIG. 3D illustrates a plot of thermal performance of the 40° N-groove collector of FIG. 3 A and the 35° ICPC collector of FIG. 2 when displaced from ideal positioning;
  • FIGURE 4 illustrates another version of the collector of FIG. 3 but with increased angle of acceptance
  • FIGURE 5 illustrates a variation on the solar collector of FIG. 3 but without the V-groove gap loss suppresser element
  • FIGURE 6A illustrates a nonimaging collector with a concentric tubular absorber and raised reflector contour providing a five degree acceptance angle and FIG. 6B illustrates a ray trace for the collector of FIG. 6A;
  • FIGURE 7 illustrates angular acceptance properties of the collector of FIG. 6.
  • FIGS. 3-6 A nonimaging solar collector constructed in accordance with the invention is shown in FIGS. 3-6 and indicated generally at 10.
  • FIGS. 1 and 2 Several prior art collector designs are shown for comparison in FIGS. 1 and 2.
  • the prior art collector 12 of FIG. 1 has heat conductor fins 14 and 16 which both radiate heat so that thermal performance is poor at temperatures above about 100°C.
  • Prior art nonimaging collector 18 of FIG. 2 has relatively good thermal performance at elevated temperatures, but absorber 20 is noncentrically disposed and requires manufacture of a somewhat intricate reflector geometry 22.
  • the inventive nonimaging solar collector 10 includes an outer glass tube housing 24 which is transparent, allowing entry of light rays 26 (see FIG. 3B) into the evacuated interior of the housing 24.
  • the housing 24 is shown as cylindrical in shape but can take on other geometries suitable for the functions described herein.
  • the light rays 26 either directly strike absorber tube 28 or reflect from reflector surface 32 to impinge upon the absorber tube 28 and thereby concen the collected light.
  • this absorber tube 28 can be shapes other than shown in the figures but is concentrically positioned relativ the housing 24.
  • the absorber tube 28 further can include a wedge shaped hea conductor 30 (see FIG. 3C) which in cross-section collectively appears with t absorber tube 28 as an "ice cream cone" geometry, as noted in FIGS. 3 A, 3B, and 5.
  • reflector surface 32 includes a gap loss reduction N-groove 34.
  • This groove 34 suppresses energy absorption gap loss which would otherwise occur when there is a space betwe the reflector surface 32 and the wedge shaped heat conductor 30.
  • a t angle of acceptance for the absorber is about 40° which would make the collector 10 suitable for east-west orientation without need of any solar tracki mechanism.
  • This particular angular acceptance with the associated N-groove provides excellent tolerance for vertical positioning errors in placement of the absorber 30, as well as good tolerance for horizontal displacements (see FIG.
  • the collector 10 of FIG. 4 has a smaller radius of curvature for the refle surface 32, resulting in a wider, 70° angle of acceptance.
  • This embodiment w allow the collector 10 to be suitable for north-south or east-west orientation without need of any solar tracking device.
  • the collector 10 of FIG. 5 is the limiting case of the embodiments of FIGS. 3 and 4 where the radius of curvature of the reflector surface 32 is coincident with the inner surface of the glass tube housing 24.
  • This embodime has an acceptance angle approaching 90°.
  • This form of the collector 10 further simplifies the construction procedure for manufacture of the collector 10.
  • the reflector surface 32 has a relatively large radius of curvature such that the angle of acceptance is about 5 and would require some crude solar tracking device, operative either continuously or intermittently.
  • This design includes a small cusp arising from the small angle of acceptance.
  • the thermal performance is quite good at elevated temperatures.
  • FIG. 7 shows the efficiency versus incident angle of the embodiment of FIG. 6 for concentration factors of two, three, four and five with reflection or Fresnel losses ignored. Concentrations of about four are achieved with efficient 5° acceptance properties.
  • Coatings can be, for example, cermets having a very low emittance (about 0.02 at 20°C) and a high absorbtance (about 0.92) over the solar spectrum.
  • Cermets are conventional materials which have layers of dielectric materials which contain a particular fraction of metal composition disposed on a metal reflector layer having an anti-reflection coating. The top layers have lower metal fractions in the dielectric material than those layers below them. The higher metal fraction layer at the bottom absorbs more energy because visible light passes through the top layers easily. The emission of black body radiation (> 2mm wave length) is however reflected by the cermet dopant quite efficiently.
  • Another class of materials useful as absorbers are certain ceramics which can easily be made using vacuum deposition. For example, conventional layers of TiN x Oy and Si ⁇ 2TiN x Oy can be deposited onto an aluminum or copper substrate until a set amount of accumulation has been measured. Both of these types of materials have a TiN x Oy layer about 53 nm thick on a substrate.
  • the above described preferred embodiments utilize a concentrically disposed absorber tube within a cylindrical reflector housing which has been evacuated.
  • the absorber tube ruither includes a wedge shaped heat conduction fi coupled to the absorber, and preferably includes an absorber layer (absorbtance greater than 0.90) with low emittance (less than about 0.05) to achieve a very efficient solar collector.
  • the simplicity of this basic design allows easy manufacturing, reducing construction costs thereby making solar collector usage more practical.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Development (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Photovoltaic Devices (AREA)
  • Mounting And Adjusting Of Optical Elements (AREA)

Abstract

A nonimaging solar collector (10). A method and article of manufacture of a solar collector includes an outer housing (24) transparent to light, a reflector element (32) positioned within the outer housing (24), an absorber (28) concentrically disposed relative to the outer housing (24), and a heat conduction fin (30) coupled to the absorber and having a wedge shape which tapers to a smaller thickness as a function of increasing radial separation from the absorber.

Description

NONIMAGING SOLAR COLLECTOR
The, present invention is concerned with a nonimaging concentrator for light. More particularly, the invention is concerned with a solar energy concentrator or collector having an absorber concentrically disposed within a glass housing enabling nonimaging light concentration, such as an evacuated cylindrical reflector tube. This absorber geometry also includes a gap loss reduction V groove which is positioned in a complementary manner relative to a wedge shaped heat conductor fin coupled to the absorber.
Nonimaging concentrators and their advantages are well known in the art (see, for example, U.S. Pat. Nos. 3,957,031; 4,002,499; 4,003,638; 4,230,095; 4,387,961; 4,359,265; and 5,289,356 incorporated by reference herein). In these previous methodologies, the device is constructed using a given absorber shape, usually a cylindrical tube, and then the appropriate nonimaging reflector is designed. This emphasis was therefore primarily on developing new reflector designs to optimize collector efficiency. There has recently been made available new types of high performance absorber materials which can even be disposed on flexible substrates. These absorbers have an absorbtance typically greater than 90% over the solar spectrum, while the hemispherical emittance at operating temperatures is quite low.
It is therefore an object of the invention to provide an improved nonimaging solar collector and method of use thereof.
It is another object of the invention to provide a novel nonimaging solar collector having an absorber concentrically disposed within a glass housing enabling nonimaging light concentration. It is a further object of the invention to provide an improved nonimaging solar collector having an outer housing and a concentrically disposed tubular absorber with a radially coupled wedge shaped heat conduction fin.
It is also an object of the invention to provide a novel nonimaging solar collector having a cylindrical reflector and tubular absorber coupled to a conical shaped cross sectional heat conductor.
It is yet another object of the invention to provide an improved solar collector having an absorber concentrically disposed within a reflector and coup conical cross section heat conductor.
It is still a further object of the invention to provide a solar collector utilizing absorbers having high efficiency and which are disposable on flexible substrates designed to optimize collection properties.
It is another object of the invention to provide a method and article of manufacture for providing high solar collector efficiency with a concentric heat exchange channel design which enables easy construction and assembly without need for solar tracking drives.
Other objects and advantages of the invention will be apparent from the detailed description and drawings described hereinbelow.
Brief Description of the Drawings
FIGURE 1 illustrates a prior art solar collector with a flat fin conductor;
FIGURE 2 illustrates a prior art nonimaging solar collector of 35° acceptance angle with an absorber disposed noncentrically within a cusp shaped reflector;
FIGURE 3A illustrates a cross-sectional view along 3A-3A on FIG. 3D o nonimaging solar collector having an absorber concentrically disposed within a cylindrical reflector with a N-groove gap loss suppresser and the absorber furthe includes a coupled heat conductor fin having a conically shaped cross section; FIG. 3B shows a ray trace for the collector of FIG. 3 A; FIG. 3C illustrates a perspective view of the solar collector of FIG. 3 A; and FIG. 3D illustrates a plot of thermal performance of the 40° N-groove collector of FIG. 3 A and the 35° ICPC collector of FIG. 2 when displaced from ideal positioning;
FIGURE 4 illustrates another version of the collector of FIG. 3 but with increased angle of acceptance;
FIGURE 5 illustrates a variation on the solar collector of FIG. 3 but without the V-groove gap loss suppresser element;
FIGURE 6A illustrates a nonimaging collector with a concentric tubular absorber and raised reflector contour providing a five degree acceptance angle and FIG. 6B illustrates a ray trace for the collector of FIG. 6A;
FIGURE 7 illustrates angular acceptance properties of the collector of FIG. 6.
Detailed Description of Preferred Embodiments
A nonimaging solar collector constructed in accordance with the invention is shown in FIGS. 3-6 and indicated generally at 10. Several prior art collector designs are shown for comparison in FIGS. 1 and 2. The prior art collector 12 of FIG. 1 has heat conductor fins 14 and 16 which both radiate heat so that thermal performance is poor at temperatures above about 100°C. Prior art nonimaging collector 18 of FIG. 2 has relatively good thermal performance at elevated temperatures, but absorber 20 is noncentrically disposed and requires manufacture of a somewhat intricate reflector geometry 22.
The inventive nonimaging solar collector 10 includes an outer glass tube housing 24 which is transparent, allowing entry of light rays 26 (see FIG. 3B) into the evacuated interior of the housing 24. The housing 24 is shown as cylindrical in shape but can take on other geometries suitable for the functions described herein. The light rays 26 either directly strike absorber tube 28 or reflect from reflector surface 32 to impinge upon the absorber tube 28 and thereby concen the collected light. In the preferred embodiment this absorber tube 28 can be shapes other than shown in the figures but is concentrically positioned relativ the housing 24. The absorber tube 28 further can include a wedge shaped hea conductor 30 (see FIG. 3C) which in cross-section collectively appears with t absorber tube 28 as an "ice cream cone" geometry, as noted in FIGS. 3 A, 3B, and 5.
In a preferred embodiment (see FIGS. 3, 4 and 5) reflector surface 32 includes a gap loss reduction N-groove 34. This groove 34 suppresses energy absorption gap loss which would otherwise occur when there is a space betwe the reflector surface 32 and the wedge shaped heat conductor 30. In FIG. 3 A t angle of acceptance for the absorber is about 40° which would make the collector 10 suitable for east-west orientation without need of any solar tracki mechanism. This particular angular acceptance with the associated N-groove provides excellent tolerance for vertical positioning errors in placement of the absorber 30, as well as good tolerance for horizontal displacements (see FIG.
The collector 10 of FIG. 4 has a smaller radius of curvature for the refle surface 32, resulting in a wider, 70° angle of acceptance. This embodiment w allow the collector 10 to be suitable for north-south or east-west orientation without need of any solar tracking device.
The collector 10 of FIG. 5 is the limiting case of the embodiments of FIGS. 3 and 4 where the radius of curvature of the reflector surface 32 is coincident with the inner surface of the glass tube housing 24. This embodime has an acceptance angle approaching 90°. This form of the collector 10 further simplifies the construction procedure for manufacture of the collector 10.
In the embodiment of FIGS. 6A and 6B, the reflector surface 32 has a relatively large radius of curvature such that the angle of acceptance is about 5 and would require some crude solar tracking device, operative either continuously or intermittently. This design includes a small cusp arising from the small angle of acceptance. The thermal performance is quite good at elevated temperatures. FIG. 7 shows the efficiency versus incident angle of the embodiment of FIG. 6 for concentration factors of two, three, four and five with reflection or Fresnel losses ignored. Concentrations of about four are achieved with efficient 5° acceptance properties.
Thermal performance for the illustrated embodiments of the figures are shown in Table I below. Calculations have been performed based on an average meteorological year in Albuquerque, New Mexico. The emittance assumed for the absorber is 0.05 at T = 100°C and an absorbtance of 0.95.
TABLE I Thermal Performance
Figure imgf000008_0001
In construction of the collector 10, it is also preferable to utilize several classes of high performance solar absorber coatings on the absorber tube 28 and the heat conductor 30. Coatings can be, for example, cermets having a very low emittance (about 0.02 at 20°C) and a high absorbtance (about 0.92) over the solar spectrum. Cermets are conventional materials which have layers of dielectric materials which contain a particular fraction of metal composition disposed on a metal reflector layer having an anti-reflection coating. The top layers have lower metal fractions in the dielectric material than those layers below them. The higher metal fraction layer at the bottom absorbs more energy because visible light passes through the top layers easily. The emission of black body radiation (> 2mm wave length) is however reflected by the cermet dopant quite efficiently. Thus, emission of radiation from the bottom layer is trapped inside the absorber material, and only the low doped top layer radiates away heat The graded metal content increases the amount of atoms seen by the mcoming light so more is absorbed and also reduces the number of atoms which can radiate away heat
Another class of materials useful as absorbers are certain ceramics which can easily be made using vacuum deposition. For example, conventional layers of TiNxOy and Siθ2TiNxOy can be deposited onto an aluminum or copper substrate until a set amount of accumulation has been measured. Both of these types of materials have a TiNxOy layer about 53 nm thick on a substrate. The second type of absorber material has a 90 nm layer of Siθ2 added. The thermal properties of such materials are very favorable for use as solar absorbers. On copper substrates an absorbtance of 0.90 or higher can be achieved with an emittance of 0.06 at T=200°C while aluminum substrates achieve absorbtance as high as 0.95 and an emittance of 0.03 at T=100°C.
The above described preferred embodiments utilize a concentrically disposed absorber tube within a cylindrical reflector housing which has been evacuated. The absorber tube ruither includes a wedge shaped heat conduction fi coupled to the absorber, and preferably includes an absorber layer (absorbtance greater than 0.90) with low emittance (less than about 0.05) to achieve a very efficient solar collector. The simplicity of this basic design allows easy manufacturing, reducing construction costs thereby making solar collector usage more practical.
Further advantages and features of the invention will be appreciated by reference to the claims set forth hereinafter. While preferred embodiments have been described, it will be clear to those of ordinary skill in the art that changes an modifications can be made without departing from the spirit and scope of the invention in its fullest aspects.

Claims

What Tς riaimeri Tς-
1. A nonimaging solar collector, comprising: an outer housing at least partially transparent to light; a reflector element disposed within said outer housing; an absorber concentrically disposed within said outer housing; and a heat conduction fin coupled to said absorber and having a wedge shape tapering to lesser thickness as a function of increasing radial separation from said absorber.
2. The solar collector as defined in Claim 1 wherein said outer housing is sealed and evacuated.
3. The solar collector as defined in Claim 1 wherein said outer housing comprises a transparent glass.
4. The solar collector as defined in Claim 1 wherein said outer housing comprises a cylindrically shaped element
5. The solar collection device as defined in Claim 4 wherein said absorber comprises a tubular shaped element
6. The solar collector device as defined in Claim 1 further including a V-groove element as part of said reflector element
7. The solar collector device as defined in Claim 6 wherein said heat conductor fin includes a tapered end and said N-groove element is symmetrically disposed relative to the tapered end of said heat conduction fin.
8. The solar collection device as defined in Claim 7 wherein the tapered end extends into said N-groove element
9. The solar collection device as defined in Claim 8 wherein said collection device has an angle of acceptance of 40° and the tapered end extends about 2 mm into said V-groove element
10. The solar collection device as defined in Claim 8 wherein said collection device has an angle of acceptance of 70° and the tapered end extends about 1 mm into said V-groove element
11. The solar collector as defined in Claim 1 wherein said reflector element comprises a reflective layer disposed on a substrate positioned within sai outer housing.
12. The solar collector as defined in Claim 11 wherein said reflective layer substrate comprises a radius of curvature greater than that of said outer housing.
13. The solar collector as defined in Claim 11 wherein said outer housing has an inner wall and said reflective layer substrate comprises a radius of curvature of said inner wall.
14. The solar collector as defined in Claim 1 wherein said absorber comprises a substrate coated with a highly efficient absorber.
15. The solar collector as defined in claim 14 wherein said highly efficient absorber is selected from the group consisting of a cermet and ceramic materials.
16. The solar collector as defined in Claim 15 wherein said ceramic materials are selected from the group conasting of Ti Nx Oy and Si 02 i Nx Oy.
17. The solar absorber as defined in Claim 16 wherein said substrate is selected from the group consisting of Al and Ox
18. The solar collector as defined in Claim 15 wherein said cermet comprises a layer structure having a variable fraction of metal content from layer to layer.
PCT/US1995/016867 1994-12-23 1995-12-22 Nonimaging solar collector Ceased WO1996020376A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU47423/96A AU705952B2 (en) 1994-12-23 1995-12-22 Nonimaging solar collector
JP52057796A JP3880621B2 (en) 1994-12-23 1995-12-22 Non-imaging type solar concentrator
EP95944654A EP0797751B1 (en) 1994-12-23 1995-12-22 Nonimaging solar collector
DE69533091T DE69533091T2 (en) 1994-12-23 1995-12-22 Non-imaging sunflower

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/363,610 US5537991A (en) 1994-12-23 1994-12-23 Nonimaging solar collector
US08/363,610 1994-12-23

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WO1996020376A1 true WO1996020376A1 (en) 1996-07-04

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US (1) US5537991A (en)
EP (1) EP0797751B1 (en)
JP (1) JP3880621B2 (en)
AU (1) AU705952B2 (en)
DE (1) DE69533091T2 (en)
ES (1) ES2223055T3 (en)
PT (1) PT797751E (en)
WO (1) WO1996020376A1 (en)

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WO2015016987A1 (en) 2013-07-31 2015-02-05 J2L Consulting, LLC Solar panel mounting system
US10520222B2 (en) 2016-01-06 2019-12-31 Frontline Aerospace, Inc. External secondary solar concentrator
US10408497B2 (en) 2016-06-09 2019-09-10 James Rosa Emergent platform diffuse light concentrating collector
EP3981071B1 (en) 2019-06-10 2024-08-28 Origami Solar, Inc. Methods and systems for folded frame solar panels
CN119999080A (en) 2022-08-21 2025-05-13 奥里加米太阳能有限公司 Support structures and mounting systems for solar panels
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Also Published As

Publication number Publication date
EP0797751A1 (en) 1997-10-01
DE69533091T2 (en) 2005-09-01
ES2223055T3 (en) 2005-02-16
US5537991A (en) 1996-07-23
JP3880621B2 (en) 2007-02-14
JPH10511451A (en) 1998-11-04
AU4742396A (en) 1996-07-19
AU705952B2 (en) 1999-06-03
PT797751E (en) 2004-10-29
EP0797751B1 (en) 2004-05-26
DE69533091D1 (en) 2004-07-01
EP0797751A4 (en) 1999-04-14

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