EP1194722A1 - Systeme de capteur solaire - Google Patents

Systeme de capteur solaire

Info

Publication number
EP1194722A1
EP1194722A1 EP00939031A EP00939031A EP1194722A1 EP 1194722 A1 EP1194722 A1 EP 1194722A1 EP 00939031 A EP00939031 A EP 00939031A EP 00939031 A EP00939031 A EP 00939031A EP 1194722 A1 EP1194722 A1 EP 1194722A1
Authority
EP
European Patent Office
Prior art keywords
collector unit
solar collector
solar
radiation
unit according
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.)
Withdrawn
Application number
EP00939031A
Other languages
German (de)
English (en)
Inventor
Menashe Barkai
Avi Brenmiller
Eli Mandelberg
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.)
Siemens Concentrated Solar Power Ltd
Original Assignee
Solel Solar Systems 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 Solel Solar Systems Ltd filed Critical Solel Solar Systems Ltd
Publication of EP1194722A1 publication Critical patent/EP1194722A1/fr
Withdrawn legal-status Critical Current

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
    • F24S23/74—Arrangements for concentrating solar-rays for solar heat collectors with reflectors with trough-shaped or cylindro-parabolic reflective surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00—Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S80/40—Casings
    • 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
    • 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
    • Y02E10/47—Mountings or tracking

Definitions

  • the present invention is generally in the field of solar collectors and more specifically it is concerned with a line-focus type solar collector.
  • Solar energy can be converted for useful work or heat by using a collector to absorb solar radiation, allowing much of the sun's radiant energy to be converted into heat, which can then be used directly in residential, industrial and agricultural operations or, converted to mechanical electric power or applied to chemical reactions for production of fuels and chemicals.
  • a solar collecting system typically comprises a concentrator and a receiver.
  • the concentrator redirects and focuses sunlight on the receiver by using mirrors or lenses, and the receiver absorbs solar radiation and converts it to heat.
  • Solar collectors are of two basic designs, namely, non- focusing and focusing.
  • Line-focus collectors are commonly considered for remote community-power systems, military applications, individual factory or commercial building systems or agricultural applications. These collectors must always point towards the sun and don't make use of diffuse and reflected light. In line-focus collectors, radiation is reflected by a concentrating, mirrored, reflector surface onto a radiation absorbing tube.
  • the most common collector is the line-focus collector with a parabolic trough-like reflective surface.
  • this type has some drawbacks.
  • the parabolic design is such that the radiation collecting tube extends above the aperture line of the collector, resulting in large dimensions and essentially heavy weight. This design, apart from consuming large space, also renders the solar unit poor wind-load resistant and relatively low durability. Where the radiation collector extends bellow the aperture line of the collector/reflector than the collector is significantly large.
  • a line-focus type solar collector unit comprising one or more trough-like concentrator or reflector and a longitudinal radiation receiver fixed at the focus of each of the one or more concentrator or reflector, the solar collector unit characterized in that it is received within a casing, said casing having a transparent sealing panel provided over the aperture of the concentrator or reflector.
  • aperture as used herein in the specification may alternatively be used to denote the "opening” or “span " of the concentrator or reflector.
  • the reflector is parabolic and the radiation receiver is a longitudinal tube through which a heat absorbing fluid flows.
  • the solar collector unit is mounted on a sun-tracking mechanism, and wherein there is further provided a sun- — > —
  • the solar collector unit is displaceable at tracking increments of about 2°.
  • the concentration ratio is defined as:
  • the radiation receiver is a tube which is preferably received within a glass enveloping tube. Still preferably, a space between the radiation receiver and the glass enveloping tube is evacuated.
  • the glass envelope tube is coated with an anti-reflector coating increasing radiation absorption of the radiation receiver and decreasing heat loss from the glass tube.
  • the transparent sealing panel is coated with an anti-reflective layer of about 94% to 97% solar radiation transparency, according to solar spectrum air mass 1.5.
  • the latter is coated with a selective solar coating.
  • the selective solar coating has emmisivity of about 0.03 to 0.09 at up to 400°C, and solar radiation absorption of about 94% to 99%.
  • the casing is preferably thermally isolated.
  • the distance of the collector from the sealing panel is about 8 to 20 mm. A preferred distance was found to be about 10mm.
  • Fig. 1 is an isometric view of a solar collector unit in accordance with an embodiment of the invention, one wall removed for the sake of clarity; 5 Fig. 2 is a sectional view along line II-II in Fig. 1 ;
  • Fig. 3 is a sectional view similar to that of Fig. 2, of a different embodiment of the solar collector unit.
  • Fig. 4 is an isometric view of still another embodiment, with one wall of the casing removed for the sake of clarity.
  • FIGs. 1 and 2 illustrating a solar collector unit generally designated 10 in accordance with a first embodiment of the invention.
  • the solar collector unit 10 comprises a trough-like reflector 12 and a tubular- longitudinal radiation receiver 14, fixed at a focus of the reflector 12. 15
  • the reflector 12 and the radiation receiver 14 are received within a casing 16 fitted with a transparent sealing panel 18 extending over the aperture (designed X in Fig. 2) of the trough-like reflector 12.
  • the panel 18 creates a hot-house effect within the collector unit 10 and thus increases the overall thermal efficiency.
  • the flat panel protects both the reflector 12 and the 20 radiation receiver 14 and is easy to maintain and clean.
  • reflector 12 is parabolic and serves also as a concentrator.
  • radiation receiver 14 is a tube through which a heat absorbing fluid flows, as known per se.
  • X is the aperture of the reflector, as indicated in Fig. 2.
  • P is the perimeter of the radiation receiver, namely of the tube 14.
  • Typical dimensions of the casing 16 seen in the figures are approximately:
  • the distance of the collector tube 14 from the sealing panel 18 is about 8 to 20 mm. with a preferred distance was found to be about 10mm. However, these are dimensions of one preferred embodiment and they may differ depending on a variety of considerations.
  • the relative compact dimensions of the solar collector unit provide good wind-load resistance, i.e., there is no need to transfer the unit to stow position at windy conditions.
  • the artisan will appreciate that for obtaining best results, it is preferred to mount the solar collector unit 10 on a sun-tracking mechanism, which may be of known design. However, the particular features of the solar collector unit according to the invention are such that tracking increments of about 2° are sufficient to obtain good concentration and thus high thermal efficiency.
  • FIG. 3 a device similar to that of Figs. 1 and 2 is illustrated, in which, for the sake of clarity, like elements were given the same reference numerals shifted by 100.
  • the radiation receiver namely tube 114 is received within a glass enveloping tube 126.
  • the intermediate space 128 between radiation receiver tube 114 and enveloping tube 126 is evacuated.
  • the radiation receiver tube 114 is coated with a selective solar coating for increasing radiation absorption and, on the other hand, decreasing heat loss therefrom.
  • Such a selective solar coating typically has emmisivity of about 0.03 to 0.09 at up to 400°C, and solar radiation absorption of about 94% to 99%.
  • the transparent sealing panel 118 is coated with an anti-reflective layer of about 94% to about 97% solar radiation transparency, measured at solar spectrum air mass 1.5.
  • space 132 between a bottom surface of the reflector 112 and the inner walls of the casing 116 is filled with thermally isolating material such as foam material, rock wool, etc.
  • casing 140 accommodates two reflectors 142 and 144 with two corresponding radiation receiver tubes 146 and 148. respectively.
  • a transparent sealing panel 150 extends over the opening of both reflectors 142 and 144. as seen in th e figure.

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)
  • Optical Elements Other Than Lenses (AREA)

Abstract

L'invention concerne une unité de capteur solaire du type à foyer linéaire (10, 110) comprenant un ou plusieurs concentrateurs ou réflecteurs cylindro-paraboliques (12, 112, 142, 144) et un récepteur de rayonnement longitudinal (14, 114, 146, 148) fixé sur le foyer de chaque concentrateur ou réflecteur. L'unité de capteur solaire est comprise dans un boîtier (16, 116, 140) pourvu d'un panneau de fermeture transparent (18, 118, 150) situé sur l'ouverture du concentrateur ou du réflecteur.
EP00939031A 1999-07-05 2000-06-27 Systeme de capteur solaire Withdrawn EP1194722A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IL13079899 1999-07-05
IL13079899A IL130798A0 (en) 1999-07-05 1999-07-05 Solar collector system
PCT/IL2000/000372 WO2001002780A1 (fr) 1999-07-05 2000-06-27 Systeme de capteur solaire

Publications (1)

Publication Number Publication Date
EP1194722A1 true EP1194722A1 (fr) 2002-04-10

Family

ID=11072990

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00939031A Withdrawn EP1194722A1 (fr) 1999-07-05 2000-06-27 Systeme de capteur solaire

Country Status (4)

Country Link
EP (1) EP1194722A1 (fr)
AU (1) AU5424000A (fr)
IL (1) IL130798A0 (fr)
WO (1) WO2001002780A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7553035B2 (en) * 2002-05-07 2009-06-30 Wright Greg J Method and apparatus for constructing a perfect trough parabolic reflector
DE10340341A1 (de) * 2003-08-29 2005-04-07 Priebe, Klaus-Peter, Dipl.-Ing. Kollektorsystem
WO2005090873A1 (fr) * 2004-03-23 2005-09-29 Menova Engineering Inc. Capteur solaire
EP2221555B1 (fr) 2009-02-24 2013-05-22 Sociedad Anonima Minera Catalano-Aragonesa (Samca) Structure de support pour capteur solaire
JP5695894B2 (ja) 2010-12-15 2015-04-08 株式会社日立製作所 太陽光集熱器
BR112013015555A2 (pt) 2010-12-20 2016-09-27 Shell Int Research processo para a liberação de lipídios a partir de uma carga de alimentação de microalgas contendo lipídios
CN106605363B (zh) * 2014-06-19 2020-11-24 卡蒂格亚涅·拉克希马南 双级抛物面聚光器

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4142514A (en) * 1976-03-04 1979-03-06 Solation Products, Inc. Solar heat collector
US4141626A (en) * 1977-05-31 1979-02-27 Fmc Corporation Method of and apparatus for collecting solar radiation utilizing variable curvature cylindrical reflectors
US4244374A (en) * 1978-05-22 1981-01-13 Man El Daniel Focussing solar collector
US4303059A (en) * 1979-09-06 1981-12-01 Energy Design Corporation Apparatus for solar energy collection
US4238247A (en) * 1979-11-05 1980-12-09 Owens-Illinois, Inc. Structure for conversion of solar radiation to electricity and heat
GB2147408A (en) * 1983-10-04 1985-05-09 Dimos Maglaras Solar water heater
US4586489A (en) * 1984-12-21 1986-05-06 Minnesota Mining And Manufacturing Company Semi-concentrating solar energy collector
FR2659132B1 (fr) * 1990-03-05 1996-03-22 Protat Hughes Four solaire.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0102780A1 *

Also Published As

Publication number Publication date
WO2001002780A1 (fr) 2001-01-11
IL130798A0 (en) 2001-01-28
AU5424000A (en) 2001-01-22

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