+

WO1982000366A1 - Reflecteur - Google Patents

Reflecteur Download PDF

Info

Publication number
WO1982000366A1
WO1982000366A1 PCT/SE1981/000216 SE8100216W WO8200366A1 WO 1982000366 A1 WO1982000366 A1 WO 1982000366A1 SE 8100216 W SE8100216 W SE 8100216W WO 8200366 A1 WO8200366 A1 WO 8200366A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheet
covering
arrangement
radiation
frame
Prior art date
Application number
PCT/SE1981/000216
Other languages
English (en)
Inventor
S Zeilon
Original Assignee
S Zeilon
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 S Zeilon filed Critical S Zeilon
Priority to AU74109/81A priority Critical patent/AU7410981A/en
Publication of WO1982000366A1 publication Critical patent/WO1982000366A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0825—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a flexible sheet or membrane, e.g. for varying the focus
    • 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
    • F24S23/81—Arrangements for concentrating solar-rays for solar heat collectors with reflectors flexible
    • 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
    • F24S80/52—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings characterised by the material
    • F24S80/525—Elements for transmitting incoming solar rays and preventing outgoing heat radiation; Transparent coverings characterised by the material made of plastics
    • 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 reflector arrangement, especially for use with solar collectors, having a sheet of reflecting material which is stretched to radiation-concentrating shape.
  • the invention has for its object to make it possible at low cost, to build reflector surfaces for concentrating solar collectors, such that there is obtained a high concentration of radiation towards a heat absorber which, consequently, can also be built at low cost and in com pact form.
  • a solar collector operating with concentrated radiation has a high degree of efficiency with high operating temperatures and low thermal inertia, whereby also short sunny spells can be utilized.
  • the reflector arrangement according to the present invention is characterized in that the sheet of reflecting material is disposed in an airtight covering of wholly or partly transparent plastic film material and defines an upper chamber and at least one lower chamber, and that a fan is adapted to maintain different air pressures in said upper and lower chambers in order to keep the covering stretched about the sheet and to stabilize the shape of said sheet.
  • a reflector arrangement of this type can be produced from very inexpensive materials and with simple construction technique. When heavily soiled or when aged, the covering is readily exchanged.
  • Fig. 1 illustrates in cross-section a converging reflector surface.
  • Fig. 2 is a top view of said reflector surface
  • Fig. 3 is a cross-section of a first embodiment of a solar collector
  • Fig. 4 is a vertical section of a second embodiment of a solar collector
  • Fig. 5 is a longitudinal section of the solar collector according to Fig. 4.
  • the material of the converging reflector surface 2 according to the invention consists of a thin and tight sheet 3 with a reflecting top layer 31.
  • the material used for the sheet is a thin polyester film coated with aluminium in an evaporation process. Such a material has a reflection factor of 0.95.
  • the geometry of the reflector surface 2 is formed by means of an edge frame 5 having parallel long sides 51 and curved short sides 52 between which wires 6 parallel to the long sides 51 are stretched.
  • the reflector sheet 3 is secured to the edge frame 5 and supported against the wires 6.
  • the reflector surface 2 will thus be divided into a number of elongate rectangular subelements 201, 202, 203 ..., each having a slightly concave converging surface because of the sagging of the sheet 3 between the wires 6.
  • the different subelements 201, 202 ... are generally oriented such that incident parallel bundles of rays 901, 902 ... are reflected or concentrated in a common focal surface 10. Due to the fact that each subelement is in itself converging, the focal surface 10 can be made considerably smaller than the surface of a subelement. By dividing the reflector surface 1 in a larger number of subelements, it is possible, in the manner described, to produce a high radiation concentration.
  • the edge frame 5 is joined along its outer edges 51, 52 to a portion of a transparent covering 1 which is arched across the reflector surface, such that a chamber 7 is formed, and to a portion of said covering 1 which is positioned beneath the reflector surface 2 and also is arched, such that a chamber 8 is formed.
  • a fan maintains a slight excess pressure with in the chamber 7 relative to the chamber 8, whereby the sheet 3 is stretched.
  • the covering 1 preferably is made of transparent plastic film which is stabilized in relation to its surroundings by means of an inner excess air pressure which is slightly higher in the chamber 7 than in the chamber 8.
  • these pressure ratios are established in the following manner by means of a fan 11.
  • the pressure side of the fan 11 is connected to the chamber 7, a number of exhaust openings 12 are provided in the sheet 3, and a throttled return passageway 13 is connected between the chamber 8 and the suc tion side of the fan 11.
  • the restriction within the pas sageway 13 makes it possible to control a circulating air flow which, due to the flow resistances within the openings 12 and the passageway 13, respectively, provides for the desired pressures.
  • the ratio of recirculated air to fresh air is controlled by means of a damper 16 at the suction side of the fan 11. It may be necessary to dry out condensate within the covering by increasing the air throughflow.
  • the covering 1 and the reflector surface 2 are preferably so designed that the focal surface 10 falls within the covering so that a radiation absorber 15 can be mounted within said covering to protect it against soiling and heat dissipating air movements caused by draught.Because of the high radiation intensity obtained in the focal surface 10 an additional cover glass in front of the absorber surface can be dispensed with.
  • the embodiment according to Fig. 3 is intended for high concentration of direct solar radiation and, consequently, high operating temperatures and large-scale heat production.
  • a solar collector module of this design is erected on the ground and in dimensions of, for example, the order 3x100 m.
  • a reflector surface 2a and a covering la are built up in accordance with what has been described in connexion with Figs. 1 and 2, and comprises an edge frame 5a with parallel long sides 51a and curved short sides 52a between which wires 6a are stretched, a reflector sheet 3a secured within the frame 5a, a transparent film 4a supported by an inner excess pressure and having an upper and a lower part, an injection fan 11a, exhaust openings 12a, a return ⁇ passageway 13a for air, and the requisite supporting brackets 16 for the frame 5a.
  • the arrangement is oriented with its longitudinal axis in an east-west direction and with the reflector surface 2a curved towards substantially the northern part of the sky. Solar radiation of southerly incidence will be converged towards a focal surface 10a.
  • the reflector surface 2a and the upper boundary surface 4a of the covering la are so designed that, according tothe solstice, the focal surface 10a will move across the rear portion of the said boundary surface 4a.
  • This surface is covered by an absorber 15a built up by parallel absorption elements, for example black water conducting pipes oriented in the longitudinal direction. The water flow is conducted to the pipes 151a which at the moment are in the focal surface 10a, whereas unillaminated pipes are blocked against water throughflcw. In this manner a high degree of efficiency is obtained in the system reflector-absorber, regardless of the solstice, and this is achieved with fixedly mounted construction elements.
  • the concentration degree in the focal or concentration surface 10a depends upon the division of the reflector surface 2a into subelements 201a, 202a...
  • a division into ten elements makes it possible to obtain a radiation concentration of 8:1. Since the division merely depends upon the number of laid-in wires 6a, extremely high concentrations are obtainable at marginal extra cost.
  • FIGs. 4 and 5 A second embodiment of a concentrating solar col lector module is shown in Figs. 4 and 5. This model is primarily intended for smaller installations having a relatively low operating temperature, for example for the production of domestic hot water.
  • the dimensions of such a module may be, for example, 1.5x4.0 m with a total absorber surface of about 5 m 2 , and a solar collector installation is constructed with an optional number of modules.
  • the arrangement comprises an edge frame consisting of two rigid vertical end panels 52b and two longitudi nal horizontal bent sheet metal sections 51b.
  • the end panels are of symmetrical heart shape with cylindrically curved lower edges and straight upper edges forming a V. Along the vertical plane of symmetry, the end panels are interconnected by means of a rectangular, planar absorber 15b.
  • a covering 1b of polyethylene film Stretched over the said edge frame is a covering 1b of polyethylene film which is secured in sections 51b and along the edges of the end panels 52b, respectively.
  • a reflector surface 2b of a reflecting sheet 3b is stretched between the end panels 52b and is anchored to the longitudinal frame sections 51b by means of tape or glue and supports itself against the lower edge of the absorber 15b.
  • the sheet 3b divides the space within said covering into an upper chamber 7b and two lower chambers 8b.
  • the pressure side of a fan 11 is connected to the chamber 7b, exhaust openings are provided in the sheet 3b, and a throttled return passageway 13b connects the chamber 8b to the suction side of the fan 11.
  • the arrangement is oriented with its longitudinal axis substantially in an east-west direction. Solar radiation incident upon the arrangement strikes both the absorber surfaces facing north and those facing south, both directly and by reflection upon the reflector surfaces 201 and 202, and this occurs substantially independently of the angle of incidence. In this manner, the arrangement is capable of absorbing both diffuse and direct solar radiation, substantially independently of the sun's position.
  • the arrangement according to the invention is especially suited for solar collectors, it may of course also be used for other purposes where a radiation concentration is desired.
  • the radiation concentrating shape need not be part-cylindrical; with a suitably formed supporting frame a, for example, spherical surface Is readily accomplished.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Photovoltaic Devices (AREA)

Abstract

Un reflecteur, specialement pour des collecteurs solaires, possede une couche (3) de materiau reflechissant qui est etire pour prendre une forme de concentration des rayons dans une couverture etanche a l'air d'un materiau au moins partiellement transparent, divisant la couverture en deux chambres (7, 8) dans lesquelles regnent des pressions d'air differentes. Les pressions d'air maintiennent la couverture (1) etiree tout autour de la feuille (3). La feuille (3) est fixee dans un cadre rigide (5) qui, a son tour, est connecte a la couverture (1). Les rayons incidents sur la feuille (3) sont concentres sur une petite zone dans laquelle est prevu un absorbeur de rayon. Le reflecteur est tres facile a fabriquer, est peu couteux et peut etre monte rapidement par des personnes non specialisees.
PCT/SE1981/000216 1980-07-17 1981-07-14 Reflecteur WO1982000366A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74109/81A AU7410981A (en) 1980-07-17 1981-07-14 Reflector arrangement

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8005222800717 1980-07-17
SE8005222A SE422116B (sv) 1980-07-17 1980-07-17 Reflektoranordning, serskilt for anvendning till solfangare

Publications (1)

Publication Number Publication Date
WO1982000366A1 true WO1982000366A1 (fr) 1982-02-04

Family

ID=20341451

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1981/000216 WO1982000366A1 (fr) 1980-07-17 1981-07-14 Reflecteur

Country Status (3)

Country Link
EP (1) EP0056043A1 (fr)
SE (1) SE422116B (fr)
WO (1) WO1982000366A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567995A1 (fr) * 1983-04-28 1986-01-24 Spasic Pablo Collecteur solaire focal pneumatique, base sur les differentes pressions de l'air dans son interieur et par rapport a l'atmosphere ambiante, la forme concave du miroir etant obtenue par depression
EP0805940A4 (fr) * 1995-01-26 1999-04-21 John F Myles Iii Systeme ameliore pour concentrer l'energie solaire, ayant des reflecteurs rempla ables
CH699605A1 (de) * 2008-09-30 2010-03-31 Airlight Energy Ip Sa Sonnenkollektor.
US8469023B2 (en) 2006-09-27 2013-06-25 Airlight Energy Ip Sa Radiation collector
WO2015123788A1 (fr) * 2014-02-20 2015-08-27 Airlight Energy Ip Sa Concentrateur solaire
WO2015135087A1 (fr) * 2014-03-13 2015-09-17 Airlight Energy Ip Sa Concentrateur solaire
US9146043B2 (en) 2009-12-17 2015-09-29 Airlight Energy Ip Sa Parabolic collector

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998522A (en) * 1975-03-24 1976-12-21 Intercontinental Satellite Network, Inc. Screen for exhibiting projected images
DE2740813A1 (de) * 1977-09-10 1979-03-22 Leonhardt Fritz Reflektor
DE2838883A1 (de) * 1977-09-26 1979-04-05 Sunthone Evakuierter sonnenenergiekollektor
US4173397A (en) * 1977-11-30 1979-11-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Solar concentrator
EP0012028A1 (fr) * 1978-12-01 1980-06-11 Raymond Barber Larsen Collecteur d'énergie solaire

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3998522A (en) * 1975-03-24 1976-12-21 Intercontinental Satellite Network, Inc. Screen for exhibiting projected images
DE2740813A1 (de) * 1977-09-10 1979-03-22 Leonhardt Fritz Reflektor
DE2838883A1 (de) * 1977-09-26 1979-04-05 Sunthone Evakuierter sonnenenergiekollektor
US4173397A (en) * 1977-11-30 1979-11-06 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Solar concentrator
EP0012028A1 (fr) * 1978-12-01 1980-06-11 Raymond Barber Larsen Collecteur d'énergie solaire

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567995A1 (fr) * 1983-04-28 1986-01-24 Spasic Pablo Collecteur solaire focal pneumatique, base sur les differentes pressions de l'air dans son interieur et par rapport a l'atmosphere ambiante, la forme concave du miroir etant obtenue par depression
EP0805940A4 (fr) * 1995-01-26 1999-04-21 John F Myles Iii Systeme ameliore pour concentrer l'energie solaire, ayant des reflecteurs rempla ables
US8469023B2 (en) 2006-09-27 2013-06-25 Airlight Energy Ip Sa Radiation collector
CH699605A1 (de) * 2008-09-30 2010-03-31 Airlight Energy Ip Sa Sonnenkollektor.
WO2010037243A3 (fr) * 2008-09-30 2011-03-10 Airlight Energy Ip Sa Collecteur solaire
AU2009299034B2 (en) * 2008-09-30 2015-04-02 Airlight Energy Ip Sa Solar collector
US9146043B2 (en) 2009-12-17 2015-09-29 Airlight Energy Ip Sa Parabolic collector
WO2015123788A1 (fr) * 2014-02-20 2015-08-27 Airlight Energy Ip Sa Concentrateur solaire
WO2015135087A1 (fr) * 2014-03-13 2015-09-17 Airlight Energy Ip Sa Concentrateur solaire

Also Published As

Publication number Publication date
SE422116B (sv) 1982-02-15
EP0056043A1 (fr) 1982-07-21

Similar Documents

Publication Publication Date Title
US9057535B2 (en) Solar energy conversion devices and systems
CA1048360A (fr) Installation de chauffage par l'energie solaire
EP0729557B1 (fr) Appareil pour recueillir l'energie de rayonnement
US4602613A (en) Solar energy concentrating and collecting arrangement
JP5497037B2 (ja) 太陽エネルギー変換
US4088116A (en) Radiant energy collector
CN103238033B (zh) 太阳能收集器系统
US20090084374A1 (en) Solar energy receiver having optically inclined aperture
US4546757A (en) Fixed position concentrating solar collector
US20030061773A1 (en) Structurally integrated solar collector
US4230094A (en) Solar concentrator
US4142510A (en) Solar heater
US4370974A (en) Inverted channel focusing solar collector
US4867134A (en) Fluid-heating solar collector
US20110209743A1 (en) Photovoltaic cell apparatus
US4210128A (en) Black liquid absorbing solar collector
WO1982000366A1 (fr) Reflecteur
US4890900A (en) Solar corrugation with shield
CA1113813A (fr) Capteur/reflecteur solaire
US4204521A (en) Solar energy tracking collector
AU7410981A (en) Reflector arrangement
US10408497B2 (en) Emergent platform diffuse light concentrating collector
US4221466A (en) Cover pane for solar collectors
US4084575A (en) Solar heater unit
JP7114848B2 (ja) 冬季太陽光の熱吸収作用を呈する採光装置

Legal Events

Date Code Title Description
AK Designated states

Designated state(s): AU DK JP US

AL Designated countries for regional patents

Designated state(s): AT CH DE FR GB NL

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载