WO2012111008A9 - Structure de support pour concentrateur solaire - Google Patents

Structure de support pour concentrateur solaire Download PDF

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Publication number
WO2012111008A9
WO2012111008A9 PCT/IL2012/050044 IL2012050044W WO2012111008A9 WO 2012111008 A9 WO2012111008 A9 WO 2012111008A9 IL 2012050044 W IL2012050044 W IL 2012050044W WO 2012111008 A9 WO2012111008 A9 WO 2012111008A9
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WO
WIPO (PCT)
Prior art keywords
module
torque
rods
solar
parabolic trough
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.)
Ceased
Application number
PCT/IL2012/050044
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English (en)
Other versions
WO2012111008A1 (fr
Inventor
Gilbert Cohen
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.)
Shikun & Binui - Renewable Energy Ltd
Original Assignee
Shikun & Binui - Renewable Energy Ltd
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Filing date
Publication date
Application filed by Shikun & Binui - Renewable Energy Ltd filed Critical Shikun & Binui - Renewable Energy Ltd
Publication of WO2012111008A1 publication Critical patent/WO2012111008A1/fr
Publication of WO2012111008A9 publication Critical patent/WO2012111008A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • F24S25/00—Arrangement of stationary mountings or supports for solar heat collector modules
    • F24S25/10—Arrangement of stationary mountings or supports for solar heat collector modules extending in directions away from a supporting surface
    • F24S25/13—Profile arrangements, e.g. trusses
    • 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 in some embodiments thereof, relates to renewable energy and, more particularly, but not exclusively, to a support structure for solar concentrator.
  • a solar concentrator includes a reflecting surface shaped as a linear parabolic trough for collecting and focusing sunlight onto an absorber tube at the focal line of the surface. The reflecting surface is moved along its horizontal axis to follow the movement of the sun during the day.
  • U.S. Patent No. 5,460,163 discloses a trough shaped mirror extends in a longitudinal direction.
  • the reflector has a focal zone in which is placed a linear heat pipe receiver.
  • the receiver is fixed in relation to the reflector, and thus moves as the reflector tracks the sun's diurnal movement.
  • U.S. Patent No. 4,173,213 discloses a series of split linear parabolic reflectors in which the outer refectory is placed within the aperture of the inner reflector.
  • U.S. Patent No. 5,058,565 discloses a solar concentrating panel which includes a support structure for providing rigid torsional support for the panel.
  • the support structure includes pairs of crossed, rigid structural support braces, each extending obliquely relative to the longitudinal axis of the panel between opposed longitudinal side edges of the parabolic surface.
  • U.S. Published Application No. 20040118395 discloses a solar concentrator module with a honeycomb structure which supports thin glass mirrors.
  • the module is supported by a tubular element extending longitudinally, so as to support the panel honeycomb structure by means of suitable transverse fins and/or ribs.
  • U.S. Patent No. 6,668,820 discloses an arrangement of optical elements for the efficient collection of light while minimizing complexities of optics needed to achieve light collection and concentration.
  • the arrangement includes a concave primary reflector, which receives the solar energy and sends it to a secondary convex refiector positioned in the focal zone of the first reflector.
  • the secondary reflector sends the solar energy to a third non-imaging reflector positioned in the focal zone of the secondary reflector.
  • a supporting structure for a solar concentrating module having a parabolic trough surface mountable on the structure.
  • the parabolic trough surface is characterized by a focal line substantially parallel to a longitudinal axis of the surface.
  • the structure comprises at least three torque rods substantially parallel to the longitudinal axis being arranged such that a transverse distance between two adjacent torque rods is at least 1 meter, and a plurality of generally parabolic ribs, mounted on the torque rods such that each rib engages a plane generally perpendicular to the torque rods.
  • a solar concentrating module comprising a parabolic trough surface mounted on the supporting structure.
  • a solar system comprising a plurality of solar concentrating modules, arranged in assemblies, wherein the modules of each assembly are connected to each other in a collinearly aligned manner.
  • a method of converting solar radiation to heat comprises using the solar system for concentrating the solar radiation onto a linear absorber tube having working liquid contained therein and being positioned generally at a focal line of the surface, so as to heat the liquid.
  • a method of assembling a solar concentrating module comprises mounting a parabolic trough surface onto the supporting structure.
  • the structure further comprises a plurality of support bars mounted on the support ribs, and wherein the parabolic trough surface is mountable on the support bars.
  • the support bars are characterized by yield strength of from about 200 MPa to about 250 MPa.
  • the parabolic trough surface is mounted directly on the support bars so as to establish a generally rigid connection.
  • the three or more torque rods comprise a central rod and at least two secondary rods at both sides of the central rod, wherein a torsional load withstood by the central rod is larger than a torsional load withstood by each of the secondary rods.
  • a ratio between the torsional load withstood by the central rod and the torsional load withstood by each of the secondary rods is from about 18 to about 198. According to some embodiments of the invention the ratio is from about 30 to about 100. According to some embodiments of the invention the ratio is from about 40 to about 100. According to some embodiments of the invention the ratio is from about 50 to about 100. According to some embodiments of the invention the ratio is from about 60 to about 100. According to some embodiments of the invention the ratio is from about 70 to about 100. According to some embodiments of the invention the ratio is about 78.
  • At least one of the ribs is a shaped metal or metal alloy having a generally flat profile.
  • the structure comprises a pair of torque plates, wherein each of the torque rods is mounted between the torque plates, such that the torque plates engage two generally parallel planes and the torque rod is generally perpendicular to the planes.
  • At least one of the pair of torque plates has a linear profile in a cross-section perpendicular to the planes.
  • At least one of the pair of torque plates has a planar a Y shape.
  • At least one of the pair of torque plates has a planar C shape or the like.
  • At least one of the pair of torque plates has a parabolic shape.
  • the structure is characterized by a stiffness of at least at least 700 Nm/mrad. According to some embodiments of the invention the structure is characterized by a stiffness of at least 800 Nm/mrad. According to some embodiments of the invention the structure is characterized by a stiffness of at least 900 Nm mrad. According to some embodiments of the invention the structure is characterized by a stiffness of about 1,000 Nm/mrad.
  • a mass ratio between the supporting structure and the parabolic trough surface is less than 1.5. According to some embodiments of the invention the mass ratio is less than 1.4.. According to some embodiments of the invention the mass ratio is less than 1.3. According to some embodiments of the invention the mass ratio is less than 1.2. According to some embodiments of the invention the mass ratio is less than 1.1. According to some embodiments of the invention the mass ratio is less than 1.0.
  • Implementation of the method and/or system of embodiments of the invention can involve performing or completing selected tasks manually, automatically, or a combination thereof. Moreover, according to actual instrumentation and equipment of embodiments of the method and/or system of the invention, several selected tasks could be implemented by hardware, by software or by firmware or by a combination thereof using an operating system.
  • a data processor such as a computing platform for executing a plurality of instructions.
  • the data processor includes a volatile memory for storing instructions and/or data and/or a non-volatile storage, for example, a magnetic hard-disk and/or removable media, for storing instructions and/or data.
  • a network connection is provided as well.
  • a display and/or a user input device such as a keyboard or mouse are optionally provided as well.
  • FIGs. 1A-C illustrate some support structures for parabolic trough reflective surfaces
  • FIGs. 2A-D are schematic illustrations of a support structure in some exemplary embodiments of the invention.
  • FIGs. 3A-D are schematic illustrations of a support structure in additional exemplary embodiments of the invention.
  • FIGs. 4A-D are schematic illustrations of a support structure in further exemplary embodiments of the invention.
  • FIG. 5 is a schematic illustration showing an exemplary arrangement of mirrors or reflector panels and mounting elements of a support structure according to some embodiments of the present invention;
  • FIG. 6 is a schematic illustration of a solar assembly according to some embodiments of the present invention.
  • FIG. 7 is a schematic illustration of a solar system according to some embodiments of the present invention.
  • FIGs. 8 A and 8B are schematic illustrations exemplifying some notations used in calculations performed according to some embodiments of the present invention
  • the present invention in some embodiments thereof, relates to renewable energy and, more particularly, but not exclusively, to a support structure for solar concentrator.
  • FIGs. 2-8 of the drawings For purposes of better understanding some embodiments of the present invention, as illustrated in FIGs. 2-8 of the drawings, reference is first made to the construction and operation of some supporting structures for parabolic trough reflective surfaces as illustrated in FIGs. 1A-C.
  • FIG. 1 A illustrates a supporting structure which comprises a single central torque tube 100 and a plurality of support ribs 102 onto which the reflective surface (not shown) is mounted.
  • the torsional load resulting from forces acting on the reflective surface is applied to torque tube 100 which transfers the forces from one rib to the other.
  • FIGs. IB and 1C illustrate another type of supporting structure.
  • the torsional load is applied, substantially equally, to a plurality of elements 104 instead of a single tube.
  • Elements 104 are arranged in a dense arrangement forming a lattice like structure, which does not include a central element.
  • the difference between the structures in FIGs. IB and 1C is that in FIG. IB elements 104 are mainly distributed far from the center, whereas in FIG. 1C they form a single unit which supports the center of the reflective surface.
  • FIG. 2A-D are schematic illustrations of a supporting structure 10 in various exemplary embodiments of the invention. Structure 10 is particularly useful in a solar concentrating module with a parabolic trough surface (not shown in FIG. 2A-D see, e.g., FIGs. 3A-4D).
  • Structure 10 preferably comprises three or more torque rods generally shown at 1 and 2.
  • rod refers to a generally straight elongated structure of any cross-section which can be either hollow or non-hollow.
  • one or more of the torque rods is hollow.
  • one or more of the torque rods has a circular cross-section.
  • Other types of rods are not excluded from the scope of the present invention.
  • Torque rods 1 and 2 serve for withstanding the torsional load resulting from moments pairs acting thereupon.
  • torque rods 1 and 2 are aligned generally parallel (e.g., with a deviation from parallelism of less than 5°) to a longitudinal axis of the trough surface.
  • the longitudinal axis of a parabolic trough surface is defined as an axis which is parallel to the focal line of the surface. Apart for some small deviations due to manufacturing imperfection, a parabolic trough surface generally does not exhibit a curvature along its longitudinal direction. Thus, a cross-section of the surface along the longitudinal axis is linear, while a cross-section of the surface perpendicularly to the longitudinal axis is parabolic. In use as a solar concentrator, the parabolic trough surface is positioned outdoors such that its longitudinal axis is generally along the North/South direction.
  • torque rods 1 and 2 are arranged such that a transverse distance, namely a distance as measured perpendicularly to the rodes, between two adjacent torque rods is at least 1 meter, or at least 1.1 meter, or at least 1.2 meter, or at least 1.3 meter, or at least 1.4 meter, or at least 1.5 meter, or at least 1.6 meter e.g., about 1.7 meter or more.
  • structure 10 comprises a central rod 1 and two or more secondary rods 2 at both sides of central rod 1. It was found by the present inventor that such configuration is advantageous from the standpoint of manufacturing simplicity and the mechanical properties of the supporting structure.
  • the torsional load withstood by central rod 1 is optionally and preferably larger than the torsional load withstood by each of secondary rods.
  • the ratio between the torsional loads withstood by central rod 1 and each of secondary rods 2 is from about 18 to about 198, or from about 30 to about 100, or from about 40 to about 100, or from about 50 to about 100, or from about 60 to about 100, or from about 70 to about 100, e.g., about 78.
  • the diameter of rod 1 is preferably substantially larger (e.g., at least two times larger or three times larger) than the diameter of each of rods 2.
  • structure 10 comprises two secondary rods 2, each designed to withstand about 1.25 % of the torsional load on structure 10, and one central rod 1 designed to withstand about 97.5 % of the torsional load. It was found by the present inventors that such torsional load distribution can be obtained by providing a central rod having a diameter which is about three times larger than the diameter of each of the two secondary rods.
  • a typical structure can thus include a central rod, about 12" in diameter, and two central rods, each having a diameter of about 4".
  • Structure 10 can also comprise a plurality of generally parabolic ribs 3, mounted on torque rods 1, 2 such that each rib engages a plane generally perpendicular to torque rods 1, 2.
  • ribs 3 are mounted such that torque rods 1, 2 are at the convex side of the ribs.
  • one or more of the rods can pass through the ribs or be at their concave side.
  • Such configurations are illustrated in FIGs. 3A, 3C, 3D, 4A and 4C.
  • Central rod 1 and secondary rods 2 are preferably non-coplanar, albeit two of the rods can define an imaginary plane.
  • the central rod can at a distance from the plane defined by the two secondary rods.
  • central rod 1 is between the plane defined by secondary rods 2 and the support ribs 3, and in the schematic illustration of FIG. 3B, central rod 1 and support ribs 3 are at opposite sides of the plane defined by rods 2.
  • the torque rods are arranged such that when the parabolic trough surface is mounted on structure 10, all the torque rods are generally at the same distance from the trough surface. A representative example of these embodiments is illustrated in FIG. 4A.
  • ribs 3 are made flat, namely they have a linear profile in a cross-section perpendicularly to the plane engaged by the respective rib (see FIG. 2C). It was found by the present inventor that such profile is advantageous for supporting parabolic trough surfaces since the main moments act at the plane of the ribs, where the shape of the rib is parabolic.
  • structure 10 comprises a plurality of support bars 4 mounted on support ribs 3.
  • Support bars 4 serve as connecting elements to the parabolic trough surface and are therefore mounted at the concave side of ribs 3.
  • Support bars 4 are preferably made from a rigid material.
  • a preferred yield strength of bars 4 is from about 200 MPa to about 250 MPa.
  • Suitable material for bars 4 is steel, but other materials such as aluminum are not excluded from the scope of the present invention.
  • support bars 4 have a dual function: they support the parabolic trough surface and also add rigidity to the solar concentrating module. When the parabolic trough surface is mounted onto structure 10 it is preferably mounted directly on support bars 4 so as to establish a generally rigid connection.
  • connection is rigid along both the axial direction and the radial direction.
  • the torque rods are preferably supported by a pair of torque plates 6, mounted on opposite sides of the torque rods.
  • torque plates 6 support torque rods 1 and 2, but not bars 4 which are mounted on ribs 3. This embodiment is illustrated in FIGs. 2C, 3B and 3C which show that bars 4 are shorter than the distance between plates 6 such that bars 4 and plates 6 are devoid of contact thereamongst.
  • bars 4 are mounted on plates 6, as illustrated in FIGs. 4A-C.
  • Plates 6 can have any shape. Preferably plates 6 are made flat, namely they have a linear profile in a cross-section perpendicularly to the plane engaged by the respective plate (see FIGs. 3B, 4B and 4D). In a front view, the planar shape of plates 6 can be any geometrical figure which allows holding the torque rods. Representative examples of planar shapes suitable for the present embodiments include, without limitation, a Y shape, a parabolic or generally parabolic shape, C shape, flattened C shape, and the like. In the embodiments illustrated in FIGs. 2B, 2D, 3A and 3C, plates 6 have Y shapes, and in the embodiments illustrated in FIGs. 4A and 4C, plates 6 have generally parabolic shapes.
  • FIGs. 3A-D and 4A-D A solar concentrating module 20 according to some embodiments of the present invention is illustrated in FIGs. 3A-D and 4A-D.
  • Module 20 comprises supporting structure 10 and a parabolic trough surface 7.
  • Surface 7 can be made of any reflective material, as known in the art. For example, in some embodiments, a glass surface is employed.
  • the length of surface 7 along its longitudinal axis generally matches the length of structure 10 which approximately equals the length of rods 3.
  • Surface 7 is preferably mounted on bars 4 of structure 10.
  • surface 7 comprises a plurality of reflector panels or mirrors 24 (e.g., glass mirrors, or aluminum panels) which are tiled onto bars 4 to form surface 7.
  • a typical separation distance between adjacent mirrors or reflector panels along the longitudinal direction is from about 7 mm to about 10 mm, and typical separation distance between adjacent mirrors or reflector panels along a direction perpendicular to the longitudinal is from about 5 mm to about 8 mm.
  • each reflector panel or mirror 24 is attached to bars 4 using mounting elements 5, such as pads or the like, at the rear side of the mirror or reflector panel.
  • Mounting elements 5 can be made, for example, from a ceramic material.
  • Mirrors or reflector panels 24 are preferably attached to bars 4 so as to establish a generally rigid connection between mirrors or reflector panels 24 and structure 10. Typically, each mirror or reflector panel is attached to two bars via four mounting elements, but use of a different number of mounting elements is excluded. Typical dimensions of a mirror or reflector panel are, without limitation, from about 1.4 m to about 1.7 m along the longitudinal direction and from about 1.0 m to about 1.5 m along the transverse direction. Mirrors or reflector panels 24 are typically arranged in a rectangular arrangement. The mirrors or reflector panels on each row (along the longitudinal direction) are optionally and preferably identical in their dimensions.
  • Mirrors or reflector panels on adjacent rows can have different dimensions, particularly along the transverse dimension so as to account for the parabolic curvature of surface 7.
  • the mirrors or reflector panels on a row closer to the central line 22 are larger in their transverse dimension than the mirrors or reflector panels on an adjacent row farther from central line 22.
  • module 20 comprises a rectangular arrangement of 20 mirrors or reflector panels with four rows of five mirrors or reflector panels. A module with more or less than 20 mirrors or reflector panels, and/or other arrangements is also contemplated.
  • a typical length of surface 7 and structure 10 is from about 5 meters to about 12 meters, e.g., about 8 meters, and typical width of surface 7 and structure 10 is from about 4 to about 8 meters, e.g., about 5 meters.
  • a typical focal length of surface 7 is from about 1 meter to about 2 meters, e.g., about 1.5 meters.
  • Other dimensions are not excluded from the scope of the present invention.
  • An exemplary arrangement of mirrors or reflector panels 24 and mounting elements 5 is schematically illustrated in the diagram of FIG. 5. The dimensions shown in FIG. 5 are not intended to limit the scope of the present invention in any way.
  • the mass ratio between the supporting structure 10 and parabolic trough surface 7 is less than 1.5 or less than 1.4 or less than 1.3 or less than 1.2 or less than 1.1 or less than 1.0.
  • the structure of the present embodiments is preferably capable to sustain winds and rotational loads on surface 7 while keeping the integrity of surface 7.
  • the structure of the present embodiments is characterized by small torsional deflection.
  • the torsional deflection is small when the overall stiffness of the support structure is high. Stiffness is typically expressed in units of torque per unit angle.
  • the overall stiffness of the support structure is at least 700 Nm/mrad or at least 800 Nm/mrad or at least 900 Nm/mrad, e.g., 1,000 Nm/mrad.
  • FIG. 6 is a schematic illustration of a solar assembly 60 according to some embodiments of the present invention.
  • Solar assembly 60 comprises a plurality of solar concentrating modules 20 connected to each other in a collinearly aligned manner.
  • Solar assembly 60 can further comprise a rotational drive unit 62 configured for rotating mirrors or reflector panels, preferably collectively, along a longitudinal axis 64.
  • rotational drive unit 62 configured for rotating mirrors or reflector panels, preferably collectively, along a longitudinal axis 64.
  • there are equal numbers of solar concentrating modules at both sides of drive unit 62 For clarity of presentation, FIG. 6 only shows modules at one side of unit 62 but the skilled person provided with the details described herein would know how to adjust the drawing to include solar concentrating modules at both sides of unit 62.
  • the number of solar concentrating modules in assembly 60 is selected depending on the amount of radiation it is desired to collect, and the load sustainable by unit 62.
  • assembly 60 comprises 10 modules (preferably 5 modules at each side of unit 62), 12 modules (preferably 6 modules at each side of unit 62), or 14 modules (preferably 7 modules at each side of unit 62), or 16 modules (preferably 8 modules at each side of unit 62), or 18 modules (preferably 9 modules at each side of unit 62), or 20 (preferably 10 modules at each side of unit 62).
  • the cumulative peak torsional torque on assembly 60 is on the order of at least 75,000 Nm.
  • Drive unit 62 can be of any type known in the art for rotating solar assemblies.
  • unit 62 can include a drive motor (e.g., electric motor), a drum and cable device, a rack or worm gear drive, a hydraulic device or the like.
  • drive unit 62 is of the self-tracking type which is capable of tracking the sun path automatically, e.g., using a computer implemented algorithm as known in the art.
  • unit 62 has a sufficiently shallow profile and narrow width so as to cast a minimal shadow on modules 20.
  • Unit 60 can comprise a heat collection element (not shown) for transfer of the solar energy reflected and focused by the reflector panels to the plant heat exchangers.
  • Unit 62 provides modules with various orientations within a range of motion which includes a solar- tracking operational range (substantially between an east horizon-facing position and a west horizon- facing position).
  • a range of motion also includes a stowed position and a maintenance position.
  • the maintenance position can be at one end of that range of motion and one of the horizon-facing positions can be at the other end of that range.
  • Unit 62 can be configured to rotate modules 20 throughout a day to track the position of the sun during the day.
  • unit 62 is also configured to rotate modules 20 throughout the year to track a position of the sun throughout the seasons. That is, unit 62 according to the present embodiments may function as an elevation drive or as an azimuth drive, or both when two mechanisms are provided as a dual acting drive.
  • FIG. 7 is a schematic illustration of a solar system 70, according to some embodiments of the present invention.
  • System 70 comprises a plurality of assemblies, such as assembly 60 described above. For simplicity only two assemblies 60 are illustrated but more than two assemblies are also contemplated.
  • a receiver tube 72 is positioned along the focal line of each assembly 60. The tube is filled with a working liquid which flows through and out of the field of assemblies 60. The working liquid which is heated by solar energy at the focal line is transferred via a forward conduit 80 to a turbine 76 which generate electricity as known in the art.
  • system 70 comprises a thermal storage unit 74. In these embodiments, conduit 80 delivers the working liquid from the focal line also to unit 74.
  • the size and/or number of assemblies 60 can be selected to allow both generation of electricity and heat storage during the day, such that in the evening or during cloudy weather the stored heat can be utilized for further generation of electricity.
  • the working liquid which now has a lower temperature, can be transferred via a return conduit 78 to tube 72, optionally via a steam condenser 82, as known in the art. It is expected that during the life of a patent maturing from this application many relevant solar systems based on parabolic trough surfaces will be developed and the scope of the term solar system is intended to include all such new technologies a priori.
  • compositions, method or structure may include additional ingredients, steps and/or parts, but only if the additional ingredients, steps and/or parts do not materially alter the basic and novel characteristics of the claimed composition, method or structure.
  • a compound or “at least one compound” may include a plurality of compounds, including mixtures thereof.
  • range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 3, 4, 5, and 6. This applies regardless of the breadth of the range.
  • An estimation of the expected twist on the structure of the present embodiments has been performed.
  • an estimated twist of a structure which includes a central rod 1 and two secondary rods 2 was compared to an estimated twist of the same structure but without secondary rods 2.
  • J pl The value of J pl can be calculated as follows:

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Abstract

L'invention concerne une structure de support pour un module concentrateur solaire ayant une surface en cuvette parabolique pouvant être montée sur la structure. La surface en cuvette parabolique est caractérisée par une ligne focale sensiblement parallèle à un axe longitudinal de la surface. La structure comprend au moins trois bielles de poussée qui sont sensiblement parallèles à l'axe longitudinal et sont agencées de sorte qu'une distance transversale entre deux bielles de poussée adjacentes est d'au moins 1 mètre. La structure de support comprend aussi une pluralité de nervures généralement paraboliques, montées sur les bielles de poussée de sorte que chaque nervure soit en prise avec un plan généralement perpendiculaire aux bielles de poussée.
PCT/IL2012/050044 2011-02-14 2012-02-13 Structure de support pour concentrateur solaire Ceased WO2012111008A1 (fr)

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US201161442319P 2011-02-14 2011-02-14
US61/442,319 2011-02-14

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WO2012111008A9 true WO2012111008A9 (fr) 2012-11-01

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US9976776B2 (en) 2011-08-25 2018-05-22 Alpha-E Aps Solar collector unit and a method of providing such a solar collector unit
CN105121975A (zh) * 2013-02-26 2015-12-02 阿尔法能源有限公司 改进的太阳能单元组件和构造这种组件的方法
CN105121975B (zh) * 2013-02-26 2017-08-25 阿尔法能源有限公司 改进的太阳能单元组件和构造这种组件的方法

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