EP1586124A2 - Collecteur solaire - Google Patents

Collecteur solaire

Info

Publication number
EP1586124A2
EP1586124A2 EP04704583A EP04704583A EP1586124A2 EP 1586124 A2 EP1586124 A2 EP 1586124A2 EP 04704583 A EP04704583 A EP 04704583A EP 04704583 A EP04704583 A EP 04704583A EP 1586124 A2 EP1586124 A2 EP 1586124A2
Authority
EP
European Patent Office
Prior art keywords
reflector
solar collector
shaped
collector according
ribs
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Withdrawn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
EP04704583A
Other languages
German (de)
English (en)
Inventor
Diem Solar - Hölle & Jakob Gbr Carpe
Klemens Jakob
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.)
Carpe Diem Solar - Hoelle & Jakob GbR
CARPE DIEM SOLAR-HOELLE JAKOB
Original Assignee
Carpe Diem Solar - Hoelle & Jakob GbR
CARPE DIEM SOLAR-HOELLE JAKOB
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 Carpe Diem Solar - Hoelle & Jakob GbR, CARPE DIEM SOLAR-HOELLE JAKOB filed Critical Carpe Diem Solar - Hoelle & Jakob GbR
Publication of EP1586124A2 publication Critical patent/EP1586124A2/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Withdrawn legal-status Critical Current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
    • F24S23/00—Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70—Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/82—Arrangements for concentrating solar-rays for solar heat collectors with reflectors characterised by the material or the construction of the reflector
    • 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
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S30/40—Arrangements for moving or orienting solar heat collector modules for rotary movement
    • F24S30/42—Arrangements for moving or orienting solar heat collector modules for rotary movement with only one rotation axis
    • F24S30/425—Horizontal axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S30/00—Arrangements for moving or orienting solar heat collector modules
    • F24S2030/10—Special components
    • F24S2030/14—Movement guiding 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
    • 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 invention relates to a solar collector with the features of the preamble of claim 1.
  • the solar radiation is concentrated on a focal line by means of parabolically shaped mirrors, the mirror channel tracking the sun's movement in the longitudinal axis of the mirror.
  • These channel collectors have proven themselves for many years and are manufactured with different mirror support structures.
  • the collectors are up to 100 m long and have a width of just under 6 m and are driven by one or two motors.
  • very high wind forces act on the reflectors because they are exposed to the weather.
  • These wind forces place high demands on the stability of the supporting structure on every collector module.
  • this also applies to the twist or torsional rigidity of the reflector holding structure, since even with slight deformation, the concentrating reflection properties are severely impaired and thus reduce the efficiency of the system.
  • trusses In order to be able to offer sufficient resistance in the form of rigidity to these torsional forces, trusses are used, on which self-supporting, parabolic shaped mirrors are saddled and fastened. This decoupling of the support structure and preformed reflectors requires a very complex overall picture.
  • a solar collector is known from DE-A-198 01 078 in which the reflector is carried by a framework.
  • the truss is attached to a support tube that supports the torsional forces.
  • the truss itself does not contribute to torsional rigidity, which is why this structure is still susceptible to torsion.
  • a parabolic trough concentrator is known, which is also formed by a framework.
  • the Torsional rigidity is to be generated by cross struts between the individual support arms, such constructions are only suitable for short-design collectors, since the torsional rigidity is not optimal.
  • DE-A-199 52 276 discloses a parabolic trough collector in which the support arms are arranged pivotably about a central axis, the torsional rigidity here also resulting solely from the central axis, which is formed by a tube. The arms themselves make no contribution to torsional rigidity.
  • WO-A-02 103 256 also shows a parabolic solar collector which has a central tube and side arms attached to it. The side arms carry the reflector. Such a reflector is relatively rigid, but it has almost no torsional rigidity.
  • the invention is therefore based on the object of providing a solar collector which has a simple structure and is nevertheless torsionally rigid.
  • the shaped ribs are surrounded by an outer skin and in this way form one closed box, which has a very high torsional rigidity.
  • the shape ribs are shaped parabolic on their concave side, "they that the reflector material, the shape of the reflector, that is to impress the parabolic shape.
  • the reflector material therefore does not have rigid but may be designed resilient so it is not that more is needed to
  • the elastic reflector material can, for example, be delivered on a coil and cut to size on site, which means that the transport costs are significantly reduced and the reflector material is much cheaper than prefabricated parabolic reflectors.
  • the solar collector according to the invention therefore has the advantage that it has a very high torsional rigidity and that not only prefabricated parabolic reflectors can be attached to it, but that it can also be fitted with elastic reflector material, since the outer skin in the concave area of the shaped ribs is parabolic to the reflector material Groove shape.
  • the shaped rib has a sickle shape. Because of the sickle shape, the entire structure with the outer skin essentially has the shape of a wing, which is known, for example, from aircraft construction or shipbuilding, and which has a high degree of rigidity with regard to bending and torsion. In order to be able to give the shaped ribs the desired shape in a simple manner, they are produced by folding or corrugation, so that a concave side edge is created which is essentially parabolically shaped. The side edge opposite the parabolically shaped side edge can be part-circular.
  • the elastic reflector material is placed on this closed, torsionally rigid support box, which is formed by the shaped ribs and the outer skin, so that the reflector material takes on the parabolic shape.
  • a trapezoidal sheet is preferably placed on the outer skin lying on the parabolically shaped side edge, which has ribs running in the longitudinal direction of the trough-shaped reflector and on which the reflector material rests.
  • this has the advantage that the contact surface for the reflector material, which is formed by the ribs of the trapezoidal sheet, is free of interference, for example free of screw heads, rivet heads and the like, and the ribs form strip-shaped contact surfaces which run parallel to one another and which support the deformation of the reflector material.
  • This also easily compensates for materials that have different coefficients of thermal expansion, for example with a reflector material made of glass and an outer skin or supporting structure made of metal.
  • the ribs of the trapezoidal sheet form channels that can be closed at the front.
  • Channels closed in this way have the advantage that they can be evacuated.
  • the elastic reflector material is placed on the supporting surfaces of the ribs with the interposition of an adhesive layer, the channels between the ribs can be evacuated, as a result of which the elastic reflector material is retained. This can be done until the adhesive has hardened sufficiently. This saves special holding devices.
  • Another possibility of optimally pressing the elastic reflector material onto the ribs is that after laying the reflector material, the channel is closed at the end and filled with water. The reflector material is pressed onto the ribs by the water pressure so that the adhesive can cure optimally.
  • the trapezoidal sheet metal can be connected to the molded rib together with the outer skin, for example by means of rivets or screws. This saves a separate riveting or screwing process, since the outer skin lies between the shaped ribs and the ribs of the trapezoidal sheet and is attached to the shaped ribs when the trapezoidal sheet is fastened.
  • the reflector material is advantageously glued to the ribs of the trapezoidal sheet. This prevents interference with the surface of the reflector material, and a wide variety of materials, including glass, can be easily connected to the trapezoidal sheet.
  • the reflector material can be a film made of metal or plastic or a thin glass with a thickness of, for example, 1 mm, the film on the top and the glass on the top and / or bottom carrying a reflective coating.
  • the advantage is also created that a second or further layers can be applied to them, which considerably simplifies repairs.
  • the reflector surfaces gradually become blind due to environmental influences or the mirroring is attacked, so that they either have to be replaced or the mirroring has to be renewed, whereas a new layer of reflector material can be applied to the solar collector according to the invention.
  • Figure 1 is a perspective
  • Figure 2 shows a support structure for a
  • Figure 3 is an end view in the direction of
  • Figure 4 shows a blank for shaped ribs
  • Figures 5a to 5c individual steps for producing a
  • Figure 6 shows an alternative drive for one on one
  • FIG. 1 shows a reflector element, which is designated overall by 10, and of which a large number are present in a solar collector system.
  • This reflector element is fastened in a known manner in a holding frame (not shown) and is aligned such that the incident solar radiation strikes the concave region 12 and is reflected from there to an absorber tube 14 (FIG. 3).
  • the concave region 12 is formed by a reflector 16 which is parabolically shaped.
  • the reflector element 10 is formed by a multiplicity of shaped ribs 18 which, as indicated in FIG. 2, lie parallel next to one another.
  • the shape of ribs 18 are surrounded in their concave portion and -12 in their convex portion 20 by an outer skin 22, as shown in FIG 1 '.
  • the outer skin 22 is screwed, glued, riveted or otherwise connected to the shaped ribs 18.
  • the shaped ribs 18 and the outer skin 22 form a closed supporting structure.
  • rivets 24 are indicated with which the shaped rib 18 is riveted to a lower section 26 of the outer skin 22.
  • An upper section 28 of the outer skin 22 rests on the concave region 12 of the shaped rib 18 and a trapezoidal sheet 30 is placed on the upper section 28 of the outer skin 22.
  • the lower webs 23 of the trapezoidal sheet 30 are riveted to the shaped rib 18 by means of rivets 34 with the interposition of the upper section 28 of the outer skin 22.
  • the upper web 36 of the trapezoidal sheet 30 now forms the Au surface for a reflector material 38 which is elastic and conforms to the shape of the upper webs 36 snugly.
  • the shape of the concave region 12 is impressed on the reflector material 38 via the trapezoidal sheet 30.
  • This shape is the desired parabolic shape so that the incident radiation is directed onto the absorber tube 14.
  • the reflector material 38 which can be a mirrored metal or plastic film, or which is formed by a thin glass layer with a thickness of 1 mm, for example, is fastened by gluing to the upper web 36 /
  • FIG. 3 also shows a holding arm 40 which carries the absorber tube 14 and which is connected, in particular riveted, to the reflector 16 and thus to the upper webs 36 of the trapezoidal sheet 30 and / or to the molding rib 18 underneath.
  • FIG. 4 shows a sheet metal strip designated by reference number 42, which has a width of 1200 mm, and from which sections 44 and 46 are alternately cut out, which have a length of 6000 mm.
  • a section 44 or 46 is shown in FIG. 5a, which is processed by a folding tool (not shown) in such a way that its side edge 48 forming the concave region 12 is bent concavely. This is done by introducing beads 50 or folds.
  • the section 44 deformed in this way still has an essentially angular outer contour, which is rounded off in the next work step by means of punching or chamfering.
  • the side edge 48 is still cut and / or flanged in such a way that it has the desired parabolic shape after the upper section 26 of the outer skin 22 and the trapezoidal sheet 30 and the reflector material 38 have been put on.
  • recesses 52 are also introduced, through which lines for liquid or electrical current laid inside the reflector element 10 are passed. The flanged edge is used to attach the rivet
  • the solar collector according to the invention which has a multiplicity of reflector elements 10, has the essential advantage that each reflector element 10 has the required torsional rigidity and that flexible reflector material 38 can be used, which has the parabolic shape due to the shape of the ribs 18 shaped trapezoidal sheet 30 is embossed. It is therefore not necessary to use preformed, rigid reflector mirrors, which are relatively expensive. Inexpensive film material or thin glass can be used, which is also inexpensive.
  • the connecting webs 54 connecting the lower web 32 to the upper web 36 easily compensate for different thermal expansions between the reflector material 38 and the outer skin 22.
  • the warm tensions are therefore not built up.
  • the reflector elements 10 lie on a flat support and can be pivoted by a suitable drive.
  • the lower section 26 of the outer skin 22 is provided with a toothing 56 which engages in a toothing or in a gearwheel pair 58 on the plane. Reflector elements 10 fastened in this way are even more torsion-resistant than suspended elements. They are also less exposed to the wind.

Abstract

La présente invention concerne un collecteur solaire qui sert à focaliser le rayonnement solaire sur une ligne focale, comprenant un support destiné à un réflecteur arqué en forme de cuvette. Selon l'invention: le support présente plusieurs nervures moulées et chaque nervure moulée présente une arête latérale de forme parabolique; les nervures moulées sont entourées d'une gaine externe; le réflecteur est composé d'un matériau élastique réfléchissant; et la forme du réflecteur est imprimée grâce à l'arête latérale de forme parabolique, directement ou en intercalant un support composé du matériau élastique réfléchissant.
EP04704583A 2003-01-24 2004-01-23 Collecteur solaire Withdrawn EP1586124A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10303476 2003-01-24
DE10303476 2003-01-24
PCT/EP2004/000564 WO2004066401A2 (fr) 2003-01-24 2004-01-23 Collecteur solaire

Publications (1)

Publication Number Publication Date
EP1586124A2 true EP1586124A2 (fr) 2005-10-19

Family

ID=32747503

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04704583A Withdrawn EP1586124A2 (fr) 2003-01-24 2004-01-23 Collecteur solaire

Country Status (3)

Country Link
US (1) US20060150967A1 (fr)
EP (1) EP1586124A2 (fr)
WO (1) WO2004066401A2 (fr)

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Also Published As

Publication number Publication date
WO2004066401A3 (fr) 2005-06-16
WO2004066401A2 (fr) 2004-08-05
US20060150967A1 (en) 2006-07-13

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