US20110155125A1 - Evecuated solar panel with a non evaporable getter pump - Google Patents

Evecuated solar panel with a non evaporable getter pump Download PDF

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Publication number
US20110155125A1
US20110155125A1 US12/996,627 US99662708A US2011155125A1 US 20110155125 A1 US20110155125 A1 US 20110155125A1 US 99662708 A US99662708 A US 99662708A US 2011155125 A1 US2011155125 A1 US 2011155125A1
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US
United States
Prior art keywords
solar panel
envelope
evacuated solar
getter pump
absorber
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.)
Abandoned
Application number
US12/996,627
Inventor
Cristoforo Benvenuti
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R&B ENERGY RESEARCH SARL
European Organization for Nuclear Research CERN
Original Assignee
R&B ENERGY RESEARCH SARL
European Organization for Nuclear Research CERN
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Publication date
Application filed by R&B ENERGY RESEARCH SARL, European Organization for Nuclear Research CERN filed Critical R&B ENERGY RESEARCH SARL
Assigned to EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN, R&B ENERGY RESEARCH SARL reassignment EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BENVENUTI, CRISTOFORO
Publication of US20110155125A1 publication Critical patent/US20110155125A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/02—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for evacuating by absorption or adsorption
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/40—Preventing corrosion; Protecting against dirt or contamination
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00—Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/40—Preventing corrosion; Protecting against dirt or contamination
    • F24S40/46—Maintaining vacuum, e.g. by using getters
    • 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
    • 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
    • F24S80/50—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings
    • F24S80/54—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings using evacuated elements
    • 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
    • F24S80/50—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings
    • F24S80/58—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings characterised by their mountings or fixing means
    • 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

Definitions

  • the present invention relates to an evacuated solar panel with a Getter pump, in particular according to the invention the getter pump is a Non-Evaporable Getter (NEG) pump.
  • NEG Non-Evaporable Getter
  • NEG pumps are widely used to maintain the vacuum inside sealed evacuated devices.
  • the gas molecules are adsorbed on the surface of the getter material, resulting in NEG saturation.
  • NEG To avoid saturation by the pumped gases and, thus, loss of the pumping effect (i.e. capability of adsorbing gases molecules) NEG must be heated to help the adsorbed gases molecules to diffuse from the surface of the getter pump within the volume of the same.
  • Heating may be applied continuously or intermittently for instance by means of electric heating.
  • the technical aim of the present invention is therefore to provide an evacuated solar panel with a NEG pump by which the said problems of the known art are eliminated.
  • an object of the invention is to provide a solar panel which is cheap when compared to the solar panels of the known art.
  • Another object of the invention is to provide a solar panel which is very reliable.
  • the non evaporable getter pump is contained in a volume enclosed by selectively blackened walls, so as to effectively absorb the solar light and reach the temperature required for gas diffusion.
  • This temperature varies for different NEG pumps and operating pressures, but in all cases it should not be lower than about 180° C.
  • FIG. 1 is a schematic view of a portion of a solar panel having a getter pump according to the invention
  • FIG. 2 is a prospective view of a getter pump of the solar panel according to the invention.
  • FIG. 3 show a different embodiment of the solar panel with a getter pump according to the invention.
  • FIG. 4 schematically shows a solar panel having the getter pump of the invention.
  • the solar panel 1 comprises a frame 2 which generally carries a plurality of spacers 3 carrying an upper transparent glass wall 4 and a back lower wall 2 a made of a metal or of a glass sheet.
  • the frame 2 with the transparent wall 4 and the back wall 2 a defines a closed chamber 6 containing the spacers 3 and an absorber 8 .
  • the adsorber 8 comprises one or more adsorbing panels 10 and one or more cooling pipes 11 connected thereto.
  • the chamber 6 also contains a NEG pump 15 which advantageously comprises an envelope having outer selectively blackened surfaces 16 and including therein one or more non-evaporable getter elements.
  • the envelope has a box-like shape and has preferably one through opening 18 for keeping the inner volume of the box-like envelope in contact with the outside (i.e. with the chamber 6 ) of the box-like envelope.
  • the envelope is thermally independent of the solar panel ( FIG. 1 ).
  • the envelope is provided with thermally insulating connecting elements 20 to the absorber (i.e. to the adsorbing panel 10 ) or to the frame 2 or to the spacers 3 of the solar panel 1 .
  • non-evaporable getter pump is suspended via springs to minimize the thermal conduction to the anchoring points, which could then be warm (adsorber) or cold (panel frame or spacers) so as to largely exceed 180° C. in good insolation conditions, no matter what panel operating temperature is chosen.
  • thermally insulating connecting elements 20 comprise metal springs or wires.
  • the absorbing panel 10 defines a cavity 22 wherein the envelope is inserted.
  • the envelope is thermally in contact with the absorber ( FIG. 3 ).
  • the absorbing plate 10 of said absorber 8 defines at least one wall 25 of the envelope which contains the NEG elements, an opposite wall 26 of this envelope being defined by a plate connected mechanically or welded to the absorbing panel.
  • This configuration may be advantageously used when the operating absorber temperature exceeds 180° C., nevertheless it may also be adopted for lower operating temperatures, provided that the circulation of the cooling fluid be intermittently stopped so as to let the absorber temperature increase to higher values (to regenerate the getter pump). This operating mode may turn out to be very helpful if existing panels must be adapted for a different use.
  • the solar panel of the invention comprises a control system arranged for intermittently stopping the circulation of the cooling fluid within the cooling pipe.
  • the embodiment above described is provided with two transparent walls, i.e. the transparent wall 4 and the back wall 2 a whenever preferably used in connection with reflecting mirrors.
  • a different embodiment may have the transparent back wall 2 a replaced by a metal wall.

Abstract

The evacuated solar panel (1) comprises a frame (2) containing a plurality of spacers (3) carrying a transparent wall (4). The transparent wall (4) with the frame (2) defines a closed chamber (6) containing the spacers (3), the light absorber (8) and a getter pump (15). The getter pump (15) comprises an envelope having selectively blackened outer surfaces (16) and including one or more non-evaporable getter NEG elements.

Description

  • The present invention relates to an evacuated solar panel with a Getter pump, in particular according to the invention the getter pump is a Non-Evaporable Getter (NEG) pump.
  • As known in the art, NEG pumps are widely used to maintain the vacuum inside sealed evacuated devices.
  • In the NEG pumps the gas molecules are adsorbed on the surface of the getter material, resulting in NEG saturation.
  • To avoid saturation by the pumped gases and, thus, loss of the pumping effect (i.e. capability of adsorbing gases molecules) NEG must be heated to help the adsorbed gases molecules to diffuse from the surface of the getter pump within the volume of the same.
  • Heating may be applied continuously or intermittently for instance by means of electric heating.
  • Nevertheless such electric heaters require electric vacuum feedthroughs, which add costs to the device and reduce its reliability.
  • The technical aim of the present invention is therefore to provide an evacuated solar panel with a NEG pump by which the said problems of the known art are eliminated.
  • Within the scope of this technical aim, an object of the invention is to provide a solar panel which is cheap when compared to the solar panels of the known art.
  • Another object of the invention is to provide a solar panel which is very reliable.
  • The technical aim, together with these and further objects, are attained according to the invention by providing an evacuated solar panel with a NEG pump in accordance with the accompanying claims.
  • Advantageously, in case of solar panels solar heating is freely available and the non evaporable getter pump is contained in a volume enclosed by selectively blackened walls, so as to effectively absorb the solar light and reach the temperature required for gas diffusion. This temperature varies for different NEG pumps and operating pressures, but in all cases it should not be lower than about 180° C.
  • Further characteristics and advantages of the invention will be more apparent from the description of a preferred but non-exclusive embodiment of the evacuated solar panel with a getter pump according to the invention, illustrated by way of non-limiting example in the accompanying drawings, in which:
  • FIG. 1 is a schematic view of a portion of a solar panel having a getter pump according to the invention;
  • FIG. 2 is a prospective view of a getter pump of the solar panel according to the invention;
  • FIG. 3 show a different embodiment of the solar panel with a getter pump according to the invention; and
  • FIG. 4 schematically shows a solar panel having the getter pump of the invention.
  • With reference to the figures, these show an evacuated solar panel generally indicated by the numeral reference 1.
  • The solar panel 1 comprises a frame 2 which generally carries a plurality of spacers 3 carrying an upper transparent glass wall 4 and a back lower wall 2 a made of a metal or of a glass sheet.
  • The frame 2 with the transparent wall 4 and the back wall 2 a defines a closed chamber 6 containing the spacers 3 and an absorber 8.
  • As known in the art the adsorber 8 comprises one or more adsorbing panels 10 and one or more cooling pipes 11 connected thereto.
  • The chamber 6 also contains a NEG pump 15 which advantageously comprises an envelope having outer selectively blackened surfaces 16 and including therein one or more non-evaporable getter elements.
  • The envelope has a box-like shape and has preferably one through opening 18 for keeping the inner volume of the box-like envelope in contact with the outside (i.e. with the chamber 6) of the box-like envelope.
  • Different opening geometries could also be envisaged.
  • In a first embodiment, the envelope is thermally independent of the solar panel (FIG. 1).
  • In this respect the envelope is provided with thermally insulating connecting elements 20 to the absorber (i.e. to the adsorbing panel 10) or to the frame 2 or to the spacers 3 of the solar panel 1.
  • Thus the non-evaporable getter pump is suspended via springs to minimize the thermal conduction to the anchoring points, which could then be warm (adsorber) or cold (panel frame or spacers) so as to largely exceed 180° C. in good insolation conditions, no matter what panel operating temperature is chosen.
  • These thermally insulating connecting elements 20 comprise metal springs or wires.
  • In particular, the absorbing panel 10 defines a cavity 22 wherein the envelope is inserted.
  • In a second embodiment the envelope is thermally in contact with the absorber (FIG. 3).
  • In this respect the absorbing plate 10 of said absorber 8 defines at least one wall 25 of the envelope which contains the NEG elements, an opposite wall 26 of this envelope being defined by a plate connected mechanically or welded to the absorbing panel.
  • This configuration may be advantageously used when the operating absorber temperature exceeds 180° C., nevertheless it may also be adopted for lower operating temperatures, provided that the circulation of the cooling fluid be intermittently stopped so as to let the absorber temperature increase to higher values (to regenerate the getter pump). This operating mode may turn out to be very helpful if existing panels must be adapted for a different use.
  • In this respect the solar panel of the invention comprises a control system arranged for intermittently stopping the circulation of the cooling fluid within the cooling pipe.
  • Advantageously both non-evaporable getter pumping speed and the gas load increase in phase with the increase of the incident solar power.
  • The embodiment above described is provided with two transparent walls, i.e. the transparent wall 4 and the back wall 2 a whenever preferably used in connection with reflecting mirrors.
  • A different embodiment (to be used without such reflecting mirrors) may have the transparent back wall 2 a replaced by a metal wall.
  • The solar panel with a getter pump conceived in this manner is susceptible to numerous modifications and variants, all falling within the scope of the inventive concept; moreover all details can be replaced by technically equivalent elements.
  • In practice the materials used and the dimensions can be chosen at will according to the requirements and to the state of the art.

Claims (9)

1. Evacuated solar panel with a getter pump, said evacuated solar panel comprising a frame carrying a plurality of spacers carrying at least a transparent wall, said transparent wall defining with said frame a closed chamber containing said spacers and an absorber and a getter pump, wherein said getter pump comprises an envelope having outer selectively blackened surfaces and including one or more NEG elements.
2. Evacuated solar panel as claimed in claim 1, wherein envelope has a box-like shape and has at least one through opening for keeping the inner volume of the box-like envelope in contact with the outside of the box-like envelope.
3. Evacuated solar panel as claimed in claim 1, wherein said envelope is thermally independent of the solar panel.
4. Evacuated solar panel as claimed claim 3, wherein said envelope is provided with thermally insulating connecting elements to the absorber or to the frame or to the spacers of the solar panel.
5. Evacuated solar panel as claimed in claim 1, wherein said thermally insulating connecting elements comprise springs.
6. Evacuated solar panel as claimed in claim 1, wherein said absorber comprises one or more absorbing panels and one or more cooling pipes connected thereto, the absorbing panel defining a cavity where said envelope is inserted.
7. Evacuated solar panel as claimed in claim 1, wherein said envelope is thermally in contact with the absorber.
8. Evacuated solar panel as claimed in claim 1, wherein an absorbing plate of said absorber defines at least one wall of said envelope which contains the NEG elements, an opposite wall of said envelope being defined by a plate connected to the absorbing panel.
9. Evacuated solar panel as claimed in claim 1, further comprising a control system arranged for intermittently stopping the circulation of the cooling fluid within the cooling pipe.
US12/996,627 2008-06-11 2008-06-11 Evecuated solar panel with a non evaporable getter pump Abandoned US20110155125A1 (en)

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Application Number Priority Date Filing Date Title
PCT/EP2008/057281 WO2009149751A1 (en) 2008-06-11 2008-06-11 Evacuated solar panel with a non evaporable getter pump

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US (1) US20110155125A1 (en)
EP (1) EP2310763B1 (en)
JP (1) JP5400144B2 (en)
KR (1) KR101512625B1 (en)
CN (1) CN102057233B (en)
AU (1) AU2008357546B2 (en)
BR (1) BRPI0822892A2 (en)
CA (1) CA2727194C (en)
DK (1) DK2310763T3 (en)
ES (1) ES2616529T3 (en)
HR (1) HRP20170272T1 (en)
PT (1) PT2310763T (en)
SI (1) SI2310763T1 (en)
WO (1) WO2009149751A1 (en)

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US20110174297A1 (en) * 2008-09-26 2011-07-21 Tvp Solar Sa Vacuum solar thermal panel with radiative screen
US20130305534A1 (en) * 2010-12-28 2013-11-21 Vittorio PALMIERI Method for performing an exhaust cycle of a vacuum solar thermal panel

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CN104763614B (en) * 2015-04-10 2017-02-01 成都国光电气股份有限公司 Magnetic steel protection piece for vacuum titanium pump

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
US20110174297A1 (en) * 2008-09-26 2011-07-21 Tvp Solar Sa Vacuum solar thermal panel with radiative screen
US8875696B2 (en) * 2008-09-26 2014-11-04 Tvp Solar Sa Vacuum solar thermal panel with radiative screen
US20130305534A1 (en) * 2010-12-28 2013-11-21 Vittorio PALMIERI Method for performing an exhaust cycle of a vacuum solar thermal panel

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AU2008357546B2 (en) 2014-02-06
WO2009149751A1 (en) 2009-12-17
JP2011523220A (en) 2011-08-04
HRP20170272T1 (en) 2017-05-05
ES2616529T8 (en) 2017-07-03
KR101512625B1 (en) 2015-04-16
SI2310763T1 (en) 2017-03-31
ES2616529T3 (en) 2017-06-13
EP2310763B1 (en) 2016-11-23
DK2310763T3 (en) 2017-03-06
KR20110030551A (en) 2011-03-23
EP2310763A1 (en) 2011-04-20
BRPI0822892A2 (en) 2019-09-24
CA2727194A1 (en) 2009-12-17
CN102057233B (en) 2012-10-03
CN102057233A (en) 2011-05-11
AU2008357546A1 (en) 2009-12-17
PT2310763T (en) 2017-03-01
JP5400144B2 (en) 2014-01-29
CA2727194C (en) 2015-08-11

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