WO1996024014A1 - Dispositif de concentration de flux solaire - Google Patents

Dispositif de concentration de flux solaire Download PDF

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Publication number
WO1996024014A1
WO1996024014A1 PCT/AU1996/000044 AU9600044W WO9624014A1 WO 1996024014 A1 WO1996024014 A1 WO 1996024014A1 AU 9600044 W AU9600044 W AU 9600044W WO 9624014 A1 WO9624014 A1 WO 9624014A1
Authority
WO
WIPO (PCT)
Prior art keywords
solar energy
flux
receiver
primary reflector
reflector surface
Prior art date
Application number
PCT/AU1996/000044
Other languages
English (en)
Inventor
John Beavis Lasich
Original Assignee
Solar Raps Pty. Ltd.
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 Raps Pty. Ltd. filed Critical Solar Raps Pty. Ltd.
Priority to JP8523117A priority Critical patent/JPH11502602A/ja
Priority to AU45313/96A priority patent/AU692047B2/en
Priority to NZ300540A priority patent/NZ300540A/xx
Priority to EP96901188A priority patent/EP0807230A4/fr
Publication of WO1996024014A1 publication Critical patent/WO1996024014A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00—Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20—Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • 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
    • F24S23/71—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with parabolic reflective surfaces
    • 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
    • F24S23/79—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with spaced and opposed interacting reflective surfaces
    • 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

Definitions

  • the present invention relates to a solar energy concentrator assembly.
  • concentrating mirrors be used to intercept a relatively large area of solar energy and focus this energy onto an array of photovoltaic cells that has a relatively small total surface area. Ith the cost of mirrors being an order of magnitude less than photovoltaic cells, the indications are that this approach may reduce the cost of solar generated electric power (SGEP) by 2 to 10 times and thus satisfy the third criteria (of economy) for the optimal solar power station.
  • SGEP solar generated electric power
  • Recognised methods of solar concentration include the use of parabolic concentrators such as parabolic troughs or dishes which can produce average concentrations of 50 and several thousand, respectively, and peak concentrations of two or more times the average concentration, with a single stage.
  • a conventional solar energy concentrator assembly as shown in vertical section, comprises a parabolic dish 3 which is arranged to reflect and concentrate solar radiation onto an array of photovoltaic cells 5 located at the focal plane of the parabolic dish 3.
  • the focal plane is a plane that is perpendicular to the central axis X of the parabolic dish 3 and contains the focal point on the central axis X.
  • the intensity of the beam from a parabolic concentrator that is incident on a "target" surface of a pv array varies with distance from the central axis of the concentrator and takes the form of a gaussian distribution.
  • the power output of a series connected pv array is limited by the pv cell in the area of lowest solar flux.
  • the variation of beam intensity shown in Figure 2 may result in the power output of the entire pv array being less than half of that in situations where the same amount of flux was evenly distributed from the axis to X.
  • the flux which is incident on the focal plane target at a distance greater than X misses the target altogether and is wasted.
  • Typical scavenger mirrors are identified by the numeral 7 in Figure 1.
  • the scavenger mirrors increase the shading of the primary mirror and thus reduce the flux that is incident on the target surface.
  • An object of the present invention is to provide a solar energy flux modifier assembly which alleviates the disadvantages of the prior art arrangements described in the preceding paragraphs and enhances the suitability of the solar energy for application to a series connected pv array.
  • a solar energy concentrator assembly which comprises:
  • a solar energy flux modifier having a front aperture, internally mirrored walls that diverge from the front aperture, and a larger rear aperture, the flux modifier being adapted to receive concentrated solar energy from the primary reflector surface via the front aperture and to re ⁇ direct solar energy via the mirrored walls and the larger rear aperture to the receiver.
  • focal plane as described herein is understood to mean the plane that is perpendicular to the central axis of the primary reflector surface and contains the focal point on the central axis of the primary reflector surface.
  • the solar energy receiver is positioned at the focal plane of the primary reflector surface.
  • the present invention is an alternative approach in which the solar energy receiver is placed behind the focal plane. At this location the beam rays from the primary reflector surface are divergent and a significant proportion are reflected by the internally mirrored surface of the solar energy flux modifier onto the solar energy receiver.
  • the flux modifier be positioned between the solar energy receiver and the focal plane of the primary reflector surface.
  • the solar energy receiver be a pv array.
  • the solar energy receiver be a receiver that requires an even flux distribution over the target surface of the receiver for optimum performance.
  • the solar energy receiver may be of any suitable shape.
  • the solar energy flux modifier may be of any suitable construction.
  • the solar flux modifier be frusto-conical or truncated pyramidal in shape when the primary reflector surface is adapted to focus solar energy onto a focal point. It is preferred that the solar flux modifier comprise a pair of divergent planar members when the primary reflector surface is adapted to focus solar energy onto a focal line.
  • the front aperture of the solar flux modifier is defined by the gap between the front edges of the planar members.
  • the solar flux modifier be formed to redirect solar energy that is incident on the mirrored walls so that there is a uniform flux distribution over the solar energy receiver.
  • the solar energy flux modifier be an internally mirrored truncated pyramid positioned between the focal plane of the primary reflector surface and the solar energy receiver.
  • FIG. 3 is a vertical section through a preferred embodiment of a solar energy concentrator assembly of the present invention.
  • the concentrator assembly comprises a primary reflector in the form of a parabolic dish 3 and a solar energy receiver in the form of a flat square pv array 5 positioned behind the focal plane of the reflecting surface of the parabolic dish 3.
  • the concentrator assembly further comprises a solar energy flux modifier, generally identified by the numeral 7, which is in the form of a truncated pyramid and comprises, a front aperture 9, side walls 11 that diverge from the front aperture 9 and are internally mirrored, and a larger rear aperture 13. It can readily be appreciated from the line marked with the numeral 15 that the flux modifier 7 is able to direct rays of solar radiation onto the pv array 5 that otherwise would be outside the usual target area of the pv array.
  • Figure 4 provides an indication of the performance of the concentrator assembly shown in Figure 3.
  • the figure is a plot of the variation of the flux intensity at the pv array 5 with distance from the central axis X - X of the parabolic dish 3.
  • the dotted line in the figure is a plot for the arrangement shown in Figure 3 without the flux modifier 7.
  • the solid line is the plot for the arrangement shown in Figure 3 with the flux modifier 7 and illustrates that the flux modifier makes it possible to achieve an even flux distribution, albeit at lower peak flux intensity, over the area of the pv array.
  • the overall effect of the above described solar energy flux modifier of the present invention is to both increase the amount of flux reaching the target surface and to improve the distribution of that flux. This is achieved by the concomitant reduction in peak intensity at the central axis of the concentrator assembly with the movement of the target surface behind the focal plane of the concentrator and the reflection of the 11 off-target" rays back onto the outer edges of the target surface.
  • Figures 5 and 6 illustrate the results of computer modelling work carried out by the applicant on a conventional paraboloidal dish-based solar energy concentrator assembly without a solar flux modifier ( Figure 5) and a solar energy concentrator assembly of the present invention with a solar flux modifier ( Figure 6) . It is clear from the Figures that the invention eliminates entirely the peaked solar energy distribution of Figure 5 and increases overall the amount of flux reaching the target surface.
  • the invention has the following features.
  • the invention does not increase shading of the primary reflector surface and thus full reflected beam power is maintained.
  • the invention straightens the scavenged rays so that they approach the solar energy receiver more directly and thus reduce the chance of re- reflection.
  • the invention improves the flux distribution.
  • the scavenged rays are directed to the outer edge of the solar energy receiver and the flux in this area is built-up to match the intensity at the centre and thus an even flux distribution is produced across the entire receiver surface area.
  • the temperature of the pv array is more even with the positive effect of reducing peak thermal stress and negative temperature coefficients of voltage.
  • the shape of the target pv array (parallel to and behind the focal plane) is also governed by the flux modifier.
  • the correct choice of flux modifier allows the pv array to be of a simple shape, eg a flat square.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Photovoltaic Devices (AREA)

Abstract

L'invention se rapporte à un concentrateur d'énergie solaire. Ce dispositif comprend: (i) une surface réfléchissante principale (3) servant à concentrer l'énergie solaire vers un plan focal; (ii) un récepteur d'énergie solaire (5) recevant l'énergie solaire réfléchie et positionné derrière le plan focal; et (iii) un dispositif de modification (7) du flux d'énergie solaire, présentant une ouverture frontale (9), des parois (11) à surface interne réfléchissante qui divergent de l'ouverture frontale (13) ainsi qu'une ouverture postérieure plus large, ce modificateur étant conçu pour recevoir de l'énergie solaire concentrée de la surface réfléchissante principale à travers l'ouverture frontale, et pour réacheminer l'énergie solaire par l'intermédiaire des parois réfléchissantes et de l'ouverture postérieure plus large jusqu'au récepteur.
PCT/AU1996/000044 1995-01-31 1996-01-31 Dispositif de concentration de flux solaire WO1996024014A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP8523117A JPH11502602A (ja) 1995-01-31 1996-01-31 太陽光光束強化装置
AU45313/96A AU692047B2 (en) 1995-01-31 1996-01-31 Solar flux enhancer
NZ300540A NZ300540A (en) 1995-01-31 1996-01-31 Solar concentrator with light scavenging reflectors
EP96901188A EP0807230A4 (fr) 1995-01-31 1996-01-31 Dispositif de concentration de flux solaire

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPN0832 1995-01-31
AUPN0832A AUPN083295A0 (en) 1995-01-31 1995-01-31 Solar flux enhancer

Publications (1)

Publication Number Publication Date
WO1996024014A1 true WO1996024014A1 (fr) 1996-08-08

Family

ID=3785192

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1996/000044 WO1996024014A1 (fr) 1995-01-31 1996-01-31 Dispositif de concentration de flux solaire

Country Status (5)

Country Link
EP (1) EP0807230A4 (fr)
JP (1) JPH11502602A (fr)
AU (1) AUPN083295A0 (fr)
NZ (1) NZ300540A (fr)
WO (1) WO1996024014A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001640A1 (de) 2008-05-07 2009-11-12 Peter Dr.-Ing. Draheim Vorrichtung zum Konzentrieren von einfallendem Licht
DE202009012152U1 (de) 2008-05-07 2010-09-16 Draheim, Peter, Dr.-Ing. Vorrichtung zum Konzentrieren von einfallendem Licht
DE102009055432A1 (de) 2009-04-19 2010-10-28 Peter Dr.-Ing. Draheim Vorrichtung und Verfahren zum Konzentrieren von einfallendem Licht
KR101118478B1 (ko) * 2009-12-31 2012-03-12 한국에너지기술연구원 태양열의 고집광 및 초점방향 전환이 용이한 2차 집광장치를 갖는 집광기
CN104748404A (zh) * 2013-12-26 2015-07-01 刘玉玺 太阳能聚焦多管集热器

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5346766B2 (ja) * 2009-10-20 2013-11-20 フジプレアム株式会社 太陽光発電装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4427838A (en) * 1981-06-09 1984-01-24 Goldman Arnold J Direct and diffused solar radiation collector
US4432345A (en) * 1981-03-13 1984-02-21 The United States Of America As Represented By The United States Department Of Energy Receiver for solar energy collector having improved aperture aspect
US4784700A (en) * 1987-05-26 1988-11-15 General Dynamics Corp./Space Systems Div. Point focus solar concentrator using reflector strips of various geometries to form primary and secondary reflectors

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
FR1455892A (fr) * 1965-05-17 1966-05-20 Centre Nat Rech Scient Perfectionnements apportés aux installations pour la captation de l'énergie transmise par rayonnement
US4047517A (en) * 1976-07-06 1977-09-13 Arnberg B Thomas Method and apparatus for receiving solar energy
US4313024A (en) * 1977-04-05 1982-01-26 Horne William E Conversion of solar to electrical energy
US4237332A (en) * 1978-09-26 1980-12-02 The United States Of America As Represented By The United States Department Of Energy Nonimaging radiant energy direction device
US4388481A (en) * 1981-07-20 1983-06-14 Alpha Solarco Inc. Concentrating photovoltaic solar collector
WO1994006046A1 (fr) * 1992-09-04 1994-03-17 The Australian National University Groupements de reflecteurs optiques et appareil les utilisant
DE4405650C1 (de) * 1994-02-22 1995-06-14 Fritz Dipl Ing Linhardt Solarkraftwerk mit photovoltaischen, gekühlten Solarmodulen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4432345A (en) * 1981-03-13 1984-02-21 The United States Of America As Represented By The United States Department Of Energy Receiver for solar energy collector having improved aperture aspect
US4427838A (en) * 1981-06-09 1984-01-24 Goldman Arnold J Direct and diffused solar radiation collector
US4784700A (en) * 1987-05-26 1988-11-15 General Dynamics Corp./Space Systems Div. Point focus solar concentrator using reflector strips of various geometries to form primary and secondary reflectors

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DERWENT ABSTRACT, Accession No. N8760E/42, Class P81; & SU,A,892 397 (ISLAMOV), 23 December 1981. *
See also references of EP0807230A4 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008001640A1 (de) 2008-05-07 2009-11-12 Peter Dr.-Ing. Draheim Vorrichtung zum Konzentrieren von einfallendem Licht
DE202009012152U1 (de) 2008-05-07 2010-09-16 Draheim, Peter, Dr.-Ing. Vorrichtung zum Konzentrieren von einfallendem Licht
DE102009055432A1 (de) 2009-04-19 2010-10-28 Peter Dr.-Ing. Draheim Vorrichtung und Verfahren zum Konzentrieren von einfallendem Licht
KR101118478B1 (ko) * 2009-12-31 2012-03-12 한국에너지기술연구원 태양열의 고집광 및 초점방향 전환이 용이한 2차 집광장치를 갖는 집광기
CN104748404A (zh) * 2013-12-26 2015-07-01 刘玉玺 太阳能聚焦多管集热器

Also Published As

Publication number Publication date
EP0807230A1 (fr) 1997-11-19
JPH11502602A (ja) 1999-03-02
NZ300540A (en) 1998-12-23
AUPN083295A0 (en) 1995-02-23
EP0807230A4 (fr) 1998-07-08

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