WO2004025193A1 - Dispositif permettant de reduire sensiblement la quantite de caloporteur dans des capteurs solaires a tubes sous vide - Google Patents

Dispositif permettant de reduire sensiblement la quantite de caloporteur dans des capteurs solaires a tubes sous vide Download PDF

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Publication number
WO2004025193A1
WO2004025193A1 PCT/NL2003/000624 NL0300624W WO2004025193A1 WO 2004025193 A1 WO2004025193 A1 WO 2004025193A1 NL 0300624 W NL0300624 W NL 0300624W WO 2004025193 A1 WO2004025193 A1 WO 2004025193A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
tubes
extra
glass
coolant
Prior art date
Application number
PCT/NL2003/000624
Other languages
English (en)
Inventor
Piet Gerard De Jong
Original Assignee
Piet Gerard De Jong
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 Piet Gerard De Jong filed Critical Piet Gerard De Jong
Priority to AU2003264564A priority Critical patent/AU2003264564A1/en
Publication of WO2004025193A1 publication Critical patent/WO2004025193A1/fr

Links

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
    • 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
    • F24S70/00—Details of absorbing elements
    • F24S70/20—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption
    • F24S70/225—Details of absorbing elements characterised by absorbing coatings; characterised by surface treatment for increasing absorption for spectrally selective absorption
    • 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

  • This invention relates to vacuum-tube solar collectors based on the Dewar principle.
  • Both tubes are preferably made of borosilicate glass.
  • the outer surface of the inner tube is provided with a spectral-selective absorption coating in order to strongly reduce heat-loss by infrared-emission.
  • said tubes are held in a concentric position by means of at least one supporting element.
  • the space between both tubes is evacuated to prevent heat losses through convection and conduction.
  • Said space also contains a ring-getter, activated to form a getter-film to maintain the necessary high vacuum level for very long time.
  • the separate collector tubes are connected to form modules.
  • Said metal tube can be designed as a U-bend tube, a linear divided tube, as heat-pipe (so including a phase-change of a liquid) or in the form of two small co-axial tubes.
  • the forced circulation of said coolant enables installation of said collector tubes in any desired position (horizontal, vertical or inclined) .
  • a further weak aspect of this design is the fact that the solar rays have to cross two glass layers prior to being absorbed, resulting in extra inherent transmission loss.
  • the outer- and inner glass tubes are not mutual melted which leads to inevitable vacuum degradation on the long term.
  • a getter material as well as a selective absorber-coating are not present.
  • the solar rays must pass two glass layers. Furthermore this concept lacks the characteristic U-form of said Dewar design.
  • German Patent DE 44 07 968 relates to a, in said inner tube inserted tube with only one bottom-end closed.
  • said inserted tube must be filled with an insulating material (e.g. rockwool) .
  • an insulating material e.g. rockwool
  • Figure 1 shows the basic principle of a common concentric vacuum-tube solar collector to which my novel type of said extra tube is added; in contradistinction to the aforesaid German patents with forced (pump) circulation this inserted tube has solely two bottoms, without any supplementary parts except spacers annex supports (not shown) .
  • This simple concept is meant for inclined positioning of the collector tubes in combination with natural circulation based on thermosyphon operation of a liquid coolant (e.g. water) .
  • a liquid coolant e.g. water
  • the restriction of this design is the necessity for a certain minimum inclination to initiate said circulation.
  • the solar collector comprises an inner glass tube 2 provided with a single bottom enveloped by a comparable glass tube 1. Said tubes are melted together on their respective open end. The remaining narrow area 3 between both tubes is highly evacuated and comprises, besides a (not shown) spacer/support, a ring-getter 4 which forms a getter film-deposite 5 after activation. The outer surface of the inner tube 2 is coated along a major portion of its length with a spectral-selective layer 6.
  • Tube 7 is inserted into said inner tube 2 in such a way that in the remaining narrow space 8 a small quantity of coolant flows without substantial pressure-loss.
  • Figure la shows a cross-section of figure 1.
  • thermosyphon systems with inherent inclined collector tubes.
  • an alternative option is to place a tiny, flexible, inert, thin-walled hard plastic tube (preferably teflon) into said small circular intervening space 8 (not shown) extending close to the inner tube bottom. At the opposite side said plastic tube is in a more or less open connection with the atmosphere.
  • this tube is wrapped spirally around tube 7 it also acts as a spacer annex support for the latter. Alternate filling and draining of a coolant occurs through only one single tube attached to an end cap (not shown) near the here downwards positioned "open" collector tube ends. During filling the air above the rising (liquid) coolant is pushed away through said tiny tube and reversely sucked in during draining.
  • Figures lb and lc show another embodiment of the present invention. Both operate under forced flow of a coolant to eliminate said restriction of said thermosyphon system. Installation can be horizontal, vertical or inclined.
  • a small extra(glass) tube 9 is inserted through a (centric) opening in the for this purpose adapted bottoms of said tube 7 (figure lb) and in said end cap.
  • the latter has a provision to enter or drain coolant which fills said space 8.
  • Figure l ⁇ concerns an alternative version by which tube 9 is located in a linear groove 10, pre-formed into tube 7. Glass penetration as in figure lb is thus avoided.
  • Figure 2 shows successive practical execution-examples of glass-processing/assembling steps related to figure lb.
  • Figure 2a shows the basic (bottomless) glass tube 7 wherein a special spacer/support for tube 9 is placed previously (not shown) .
  • Said tube 7 is pre-formed to preferably the rough form 11 as drawn in figure 2b.
  • Figure 3 fundamentally distinguish from the aforesaid figure 1 by the lack of the characteristic U-form. Instead said outer tube 1 and said inner tube 2 are melted to ea ⁇ hother on both their open ends as shown in figure 3a. Similar to figure 1 the inner tube has a selective layer 6. Said interjacent space 3 is highly evacuated and provided with a special-developed getter 14 which is activated in order to form getter-deposite 15. Said tube 7 is inserted into said inner tube 2 (not shown) . The aim of this design is to facilitate the mutual linking of separate collector tubes to long series and modules.
  • Figures 3b/3 ⁇ show said tube 7 with semi-spherical as well as concave bottoms to ease interconnection. However in principle both tubes can be made with straight bottoms too. Main advantage of this concept is the possibility for a uni-directional coolant flow without the need for a back stream within each single solar collector tube.
  • tubes 7 and 9 are both made of glass; however in principle materials like (pre-formed) metals and/or plastics can also be used for one or both.
  • this invention can also be usable in concepts where the absorber tube is located eccentrically within the lower half of the outer tube; the latter provided with a semi-circular reflective coating.
  • Still another possibility is leaving said tube 7 open at one side and integrate it with said end cap (not shown) .

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Thermal Insulation (AREA)
  • Joining Of Glass To Other Materials (AREA)

Abstract

L'invention a trait à un capteur solaire à tubes concentriques sous vide, fondé sur le principe de Dewar. Ledit capteur comprend un tube de verre intérieur (2), doté d'un revêtement de surface (6) à sélectivité spectrale, et entouré par un second tube de verre (1). L'espace (3) situé entre lesdits tubes est fortement mis sous vide, et contient un sorbeur en anneau (4) qui se dépose sous forme de film de sorbeur (5) une fois activé. A cause du système actuel de thermosiphon, le tube (2) est entièrement rempli d'un liquide caloporteur présentant une forte capacité calorifique inhérente. Afin d'éliminer cet inconvénient, on introduit un tube de verre fermé (7) supplémentaire dans le tube (2), de façon qu'il reste un espace étroit (8) contenant un peu de caloporteur. Afin que soit amorcé un écoulement naturel, les tubes du capteur doivent être placés de manière à être inclinés.
PCT/NL2003/000624 2002-09-11 2003-09-09 Dispositif permettant de reduire sensiblement la quantite de caloporteur dans des capteurs solaires a tubes sous vide WO2004025193A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003264564A AU2003264564A1 (en) 2002-09-11 2003-09-09 Evacuated tubular solar collector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1021429A NL1021429C2 (nl) 2002-09-11 2002-09-11 Inrichting annex werkwijze ter beperking van het koelvloeistof volume terzake van dubbelwandige vacuümbuis-zonnecollectoren.
NL1021429 2002-09-11

Publications (1)

Publication Number Publication Date
WO2004025193A1 true WO2004025193A1 (fr) 2004-03-25

Family

ID=31987579

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2003/000624 WO2004025193A1 (fr) 2002-09-11 2003-09-09 Dispositif permettant de reduire sensiblement la quantite de caloporteur dans des capteurs solaires a tubes sous vide

Country Status (3)

Country Link
AU (1) AU2003264564A1 (fr)
NL (1) NL1021429C2 (fr)
WO (1) WO2004025193A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITSA20080028A1 (it) * 2008-09-12 2008-12-12 Green Earth S R L Tubo collettore per concentratori solari lineari avente micropolveri ad alta temperatura come vettore.
WO2009105190A2 (fr) * 2008-02-20 2009-08-27 Corning Incorporated Élément de collecte d'énergie solaire à tube central en vitrocéramique
WO2010043942A2 (fr) * 2008-10-16 2010-04-22 Kloben S.A.S. Di Turco Adelino E C. Collecteur solaire évacué en verre amélioré et procédé de fabrication correspondant
FR2951253A1 (fr) * 2009-10-09 2011-04-15 Sophia Antipolis En Dev Capteur solaire, et systeme de production d'eau chaude comportant de tels capteurs solaires
CN102032695A (zh) * 2011-01-11 2011-04-27 皇明太阳能股份有限公司 全玻璃真空直通强制循环集热管
CN101762050B (zh) * 2008-10-27 2013-12-11 淄博环能海臣环保技术服务有限公司 一种内置光伏电池组件的全玻璃热管真空集热管
CN101762047B (zh) * 2008-10-27 2015-03-11 北京环能海臣科技有限公司 一种设有聚光透镜的玻璃真空集蓄热管
CN101762043B (zh) * 2008-10-27 2015-03-11 北京环能海臣科技有限公司 一种玻璃真空集蓄热管
CN101762053B (zh) * 2008-10-27 2015-03-11 北京环能海臣科技有限公司 内置装饰反光镜片的玻璃真空集蓄热管

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205378A (en) * 1938-03-12 1940-06-25 Abbot Charles Greeley Solar flash boiler
US2475544A (en) * 1945-09-25 1949-07-05 Cueto Raul Del Radiant energy collector
US4043318A (en) * 1974-06-24 1977-08-23 Owens-Illinois, Inc. Solar energy collector
NL7705362A (nl) * 1976-05-19 1977-11-22 Philips Nv Zonnecollector met een langgerekt dewar-vat.
US4508104A (en) * 1982-09-23 1985-04-02 Nitto Kohki Co., Ltd. Retaining device for an inner tube of an evacuated double-tubing type solar heat collector
US4579107A (en) * 1984-03-16 1986-04-01 David Deakin Solar energy collector and method of making same
US4615329A (en) * 1982-03-07 1986-10-07 Nitto Kohki Co., Ltd. Solar heat collector arrangement
US4649903A (en) * 1982-03-07 1987-03-17 Nitto Kohki Co., Ltd. Solar heat collector
WO1987003950A1 (fr) * 1985-12-23 1987-07-02 The University Of Sydney Tube avec espace sous vide intermediaire pour collecteur solaire
DE29801531U1 (de) * 1998-01-31 1998-07-02 Schletter Alexander Dipl Ing Glasvakuumröhrenkollektor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2354121A1 (fr) * 1976-06-11 1978-01-06 Degremont Appareil de deshydratation des boues
DE4407968A1 (de) * 1994-03-10 1995-09-21 Peter Kobler Kollektorsegment für einen Solarkollektor sowie Solarkollektor mit mehreren derartigen Kollektorsegmenten

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2205378A (en) * 1938-03-12 1940-06-25 Abbot Charles Greeley Solar flash boiler
US2475544A (en) * 1945-09-25 1949-07-05 Cueto Raul Del Radiant energy collector
US4043318A (en) * 1974-06-24 1977-08-23 Owens-Illinois, Inc. Solar energy collector
NL7705362A (nl) * 1976-05-19 1977-11-22 Philips Nv Zonnecollector met een langgerekt dewar-vat.
US4615329A (en) * 1982-03-07 1986-10-07 Nitto Kohki Co., Ltd. Solar heat collector arrangement
US4649903A (en) * 1982-03-07 1987-03-17 Nitto Kohki Co., Ltd. Solar heat collector
US4508104A (en) * 1982-09-23 1985-04-02 Nitto Kohki Co., Ltd. Retaining device for an inner tube of an evacuated double-tubing type solar heat collector
US4579107A (en) * 1984-03-16 1986-04-01 David Deakin Solar energy collector and method of making same
WO1987003950A1 (fr) * 1985-12-23 1987-07-02 The University Of Sydney Tube avec espace sous vide intermediaire pour collecteur solaire
DE29801531U1 (de) * 1998-01-31 1998-07-02 Schletter Alexander Dipl Ing Glasvakuumröhrenkollektor

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009105190A2 (fr) * 2008-02-20 2009-08-27 Corning Incorporated Élément de collecte d'énergie solaire à tube central en vitrocéramique
WO2009105190A3 (fr) * 2008-02-20 2009-10-15 Corning Incorporated Élément de collecte d'énergie solaire à tube central en vitrocéramique
CN102203520A (zh) * 2008-09-12 2011-09-28 因特纽电子有限公司 用于太阳能聚焦发电设备的热载体系统
WO2010029411A2 (fr) * 2008-09-12 2010-03-18 Internew Electronics S.R.L. Système à vecteur thermique pour centrale électrique à concentration d’énergie solaire
WO2010029411A3 (fr) * 2008-09-12 2010-05-14 Internew Electronics S.R.L. Système à vecteur thermique pour centrale électrique à concentration d’énergie solaire
US9038386B2 (en) 2008-09-12 2015-05-26 Internew Electronics S.R.L. Thermal vector system for solar concentration power plant
ITSA20080028A1 (it) * 2008-09-12 2008-12-12 Green Earth S R L Tubo collettore per concentratori solari lineari avente micropolveri ad alta temperatura come vettore.
WO2010043942A2 (fr) * 2008-10-16 2010-04-22 Kloben S.A.S. Di Turco Adelino E C. Collecteur solaire évacué en verre amélioré et procédé de fabrication correspondant
WO2010043942A3 (fr) * 2008-10-16 2011-04-21 Kloben S.A.S. Di Turco Adelino E C. Collecteur solaire évacué en verre amélioré et procédé de fabrication correspondant
CN101762047B (zh) * 2008-10-27 2015-03-11 北京环能海臣科技有限公司 一种设有聚光透镜的玻璃真空集蓄热管
CN101762050B (zh) * 2008-10-27 2013-12-11 淄博环能海臣环保技术服务有限公司 一种内置光伏电池组件的全玻璃热管真空集热管
CN101762043B (zh) * 2008-10-27 2015-03-11 北京环能海臣科技有限公司 一种玻璃真空集蓄热管
CN101762053B (zh) * 2008-10-27 2015-03-11 北京环能海臣科技有限公司 内置装饰反光镜片的玻璃真空集蓄热管
WO2011042657A3 (fr) * 2009-10-09 2012-10-26 Sophia Antipolis Energie Developpement Capteur solaire, et système de production d'eau chaude comportant de tels capteurs solaires
FR2951253A1 (fr) * 2009-10-09 2011-04-15 Sophia Antipolis En Dev Capteur solaire, et systeme de production d'eau chaude comportant de tels capteurs solaires
CN102032695A (zh) * 2011-01-11 2011-04-27 皇明太阳能股份有限公司 全玻璃真空直通强制循环集热管

Also Published As

Publication number Publication date
NL1021429C2 (nl) 2004-03-16
AU2003264564A1 (en) 2004-04-30

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