WO2018154497A1 - Système solaire à concentration - Google Patents

Système solaire à concentration Download PDF

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Publication number
WO2018154497A1
WO2018154497A1 PCT/IB2018/051133 IB2018051133W WO2018154497A1 WO 2018154497 A1 WO2018154497 A1 WO 2018154497A1 IB 2018051133 W IB2018051133 W IB 2018051133W WO 2018154497 A1 WO2018154497 A1 WO 2018154497A1
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WO
WIPO (PCT)
Prior art keywords
beams
crossmember
crossmembers
joints
module
Prior art date
Application number
PCT/IB2018/051133
Other languages
English (en)
Inventor
Giovanni Murgia
Original Assignee
Suberia Systems Srl
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 Suberia Systems Srl filed Critical Suberia Systems Srl
Publication of WO2018154497A1 publication Critical patent/WO2018154497A1/fr

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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
    • 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
    • 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
    • F24S2023/87—Reflectors layout
    • F24S2023/872—Assemblies of spaced reflective elements on common support, e.g. Fresnel reflectors
    • 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
    • F24S2025/80—Special profiles
    • F24S2025/802—Special profiles having circular or oval cross-section
    • 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 relates to a concentrated solar thermal system.
  • CSP Concentrated Solar Power
  • CST Concentrated Solar Thermal
  • solar concentration is achieved by means of an optical system consisting of reflecting surfaces moved by suitable drives that allow them to follow the apparent motion of the sun and to direct the solar radiation beams, via the optical reflection mechanism, towards a linear receiver, e.g. linear parabolic troughs and Fresnel reflectors, or towards a punctiform receiver, e.g. solar tower or solar dish systems.
  • Linear parabolic concentrators are made up of long lines of linear parabolic reflectors that concentrate the solar radiation incident on a linear receiver integral with the parabolic reflector and positioned along the latter' s focal axis.
  • a linear receiver comprises a duct, referred to as receiver or absorber tube, into which a thermovector fluid flows, which is then heated and transfers heat to a thermoelectric plant for power generation or to another plant directly using this thermal energy.
  • Fresnel reflector systems solar concentration is achieved by means of long parallel rows of reflectors equidistant from the ground and moved by suitable drives. Fresnel reflectors have a flat or slightly curved geometry for better focusing capability.
  • the linear receiver which is similar to the one used in parabolic reflectors, is fixed and is not integral with the optical system that concentrates the solar radiation.
  • an optical system typically consisting of individually driven flat square mirrors capable of turning about two perpendicular axes, directs the reflected beam of solar radiation towards a punctiform receiver located at a height of several tens of metres.
  • solar dish systems concentrate the solar radiation towards a punctiform receiver.
  • the punctiform receiver is located at the geometric focus of the optical system and is integral therewith.
  • the dish is sometimes made up of a number of smaller reflecting elements, mechanically integral with one another and driven by a single biaxial drive.
  • the efficiency of a concentrated solar thermal system as a whole mainly depends on the optical performance of the reflector, i.e. its capability of effectively concentrating the solar radiation incident on the surface of the receiver.
  • the mirror surfaces are highly reflective, rigid and precisely curved, since they must also be positioned correctly and be capable of accurately following the apparent motion of the sun (solar tracking) .
  • the mechanical structure that supports the reflective panels briefly referred to as support structure, must be sufficiently rigid from a structural viewpoint, in order not to jeopardize the optical-geometrical precision in strong-wind conditions or during the movements occurring while tracking the sun or, more simply, because of the elastic deformations caused by the weight of the panels themselves.
  • Another fundamental property of the support structure is its service life, i.e. its capability of keeping its mechanical properties and its performance unchanged throughout the life of the solar system.
  • the metallic support structure which, together with the reflective panels, is the biggest and heaviest component of a concentrated solar system, should preferably be made of recyclable and/or renewable materials that are safe for both the health and the environment .
  • the support structure is one of the two biggest components of a CSP/CST system - the other being the reflector assembly - and its cost strongly affects the total cost of this technology.
  • the necessity of limiting the cost of the support structure, while still meeting the above-described requirements of mechanical strength, precision, duration and installation simplicity, is what makes it difficult to design an effective and competitive solution for support structures of CSP/CST systems.
  • the low cost of the metal structure must not affect the basic requirements of mechanical strength, life and precision, nor can it be compensated for by complex assembling and processing during the implementation stage.
  • the implementation cost of the metal structure must be limited to a fraction of the cost of the finished material, e.g. 30%-50%.
  • the metallic support structure is made up of tubes having a circular cross-section cut to size in the transverse direction (i.e. orthogonally to the tube axis);
  • tube-to-tube joints are effected by means of commercial joints made of malleable cast-iron secured by means of a set screw, with the only exception of coaxial tube-to-tube joints, which are preferably made by using a commercial friction joint made of cold-pressed steel;
  • the final price of the finished material (the cut-to-size tube) turns out to be only marginally higher than the price of the initial semifinished product (the tube not yet cut) .
  • the elimination of any further mechanical machining during the installation stage, such as welding, drilling, boring, etc. simplifies the assembly work and keeps the installation costs low.
  • the circular tubular sections offer, compared to metal sections having different geometric cross-sections, higher inertia to lateral deflection (peak load) relative to the axis in any direction. This allows achieving the target performance in terms of mechanical strength, the selected material being the same, by using lighter, and hence less expensive, elements.
  • the invention relates to a concentrated solar system equipped with a modular tubular metallic support structure, the base module of which consists of two simple tubular frames formed by two uprights and a crossmember, rigidly connected at the frame nodes by two longitudinal beams to form a rectangular tubular structure with the uprights lying on the horizontal plane, i.e. the anchorage plane.
  • a triangular structure is connected, formed by two upper beams preferably of the same material and diameter as those of the beams of the rectangular frame .
  • the modular unity of the structure is completed by a top beam, i.e. a beam that is parallel to the horizontal anchorage plane, which connects the vertices of the triangular structures; said top beam is also made up of tubes having the same characteristics as the other beams described so far.
  • the support structure comprises metal tubes having a circular cross-section of various length and commercial joints made of malleable cast-iron or cold-pressed steel (such as, for example, scaffolding joints) .
  • Tube-to- joint anchorage is effected by means of steel set screws, for joints made of malleable cast-iron, or by friction with fastening bolts, for joints made of cold-pressed steel.
  • the tubes of the structure comprise the following preferred but non-exclusive properties: non-welded hollow steel tubes with a circular profile, preferably all having the same outside diameter of 48.3 mm or l'l/2 inches (i.e. the standard size of structural scaffolding tubes), protected against oxidation by galvanizing.
  • the material of the tubes is preferably galvanized, hot- rolled, fine-grain, non-alloy steel for structural use, but various non-alloy or alloy steel types can be used, with different grain sizes, subjected to forming and corrosion protection treatments, provided that all the tubular beams of the structure must have minimum mechanical characteristics (expansion, tensile strength, yield and resilience) to meet the design specifications.
  • aluminium tubes may be used instead of steel ones.
  • the crossmembers i.e. the base beams of the triangular structures
  • the crossmembers are the beams whereon the reflectors rest. More specifically, they support the bearings and/or the actuators that support the drive shafts of the solar tracking mechanism, whereon the reflectors are in turn integrally connected.
  • the top beam supports the elements that receive the concentrated solar radiation. Said elements essentially consist of the evacuated receiver tube and the CPC (Compound Parabolic Concentrator) secondary reflector.
  • the whole tubular structure further comprises some oblique reinforcement beams, called diagonal beams, that are mainly subjected to tensile or compressive strains according to the typical scheme of reticular structures.
  • a diagonal beam connects each upright of the structure to the crossmember connected thereto.
  • the reflectors and the solar tracking mechanical assembly i.e. most of the concentrator's weight, rest on the crossmember.
  • Said diagonal element limits the inflection of the crossmember by countering the static thrusts (the weight of the reflectors) and the dynamic thrusts (wind pressure on the reflectors' surface) .
  • the structure further comprises a diagonal beam that connects the crossmember to the upper beams. This diagonal element reduces the inflection of the upper beams.
  • Other reinforcement diagonal tubular elements may also be included in the support structure, though not expressly described and illustrated herein.
  • the support structure module described so far can be further extended by adding two tubular beams, the function of which is to extend the crossmember.
  • the two tubes are symmetrically anchored to the two upper beam-crossmember nodes and are oriented coaxially to the crossmember.
  • the inflection of the extension beams is supported by the addition of two further diagonal tubes that connect said extensions to the upright adjacent thereto.
  • the function of the extensions is to increase the length of the support base for the rows of Fresnel reflectors, so that a greater number of reflector rows can be housed in the support structure.
  • the modules can be replicated indefinitely along the longitudinal direction, i.e. along the direction of the top beam and of the longitudinal beams, up to the desired length of the row of the solar concentrator.
  • a reinforcement tube is added, which joins the connection node between the top beam and the outermost triangular structure to the support plane of the structure (where it will be anchored, by means of suitable hooks and/or flanges, to the foundation structure) .
  • Said final beam increases the mechanical strength of the various triangular structures lying in succession along the entire concentrator row, as well as their resistance to deformations generated by strains in a direction parallel to the top beam.
  • the minimum precision required for cutting to size tubular sections may be +/- 1.00mm, although greater precision, around +/- 0.5mm, can be easily obtained even when using simple machine tools without numerical control.
  • the latter can be assembled quickly without requiring any further adjustment and/or setting, ensuring a positioning tolerance within +/- lmm/m.
  • the conditions of perpendicularity between the longitudinal beam and the crossmember i.e. the conditions of rectangularity of the structure
  • the conditions of perpendicularity between the longitudinal beam and the crossmember are imposed by the particular tube-to-tube joints positioned at the nodes of the rectangular frame, as will be further described in the detailed description of the invention. Should such a joint be unavailable and need to be replaced with two joints not ensuring mutual perpendicularity of the tubes connected thereto, the condition of perpendicularity can nevertheless be imposed through the use of assembly jigs.
  • a diagonal beam may be temporarily installed, arranged along the geometric diagonal of the rectangular frame, also made up of cut-to-size tubes and joints positioned "in abutment" at the head and tail of said tubes.
  • Such a tubular structure can only be assembled when the longitudinal beams and the crossmembers are orthogonal to each other. Once the condition of orthogonality has been ensured, the positions of the beams are fixed by tightening the joints, and the diagonal beams acting as an assembly jig, positioned along the geometric diagonal of the frame, can then be removed.
  • the only tools necessary for assembling the structure are a hexagonal wrench for tightening the set screws of malleable cast-iron joints and a suitably sized wrench for the bolts of cold-pressed steel joints.
  • tightening should be effected by using a torque wrench, in order to apply the appropriate tightening torque to set screws and bolts.
  • the mechanical strength and fatigue strength of the structure depend on several factors including: diameter, thickness and material of the tubes and geometric characteristics of the structure (e.g. beam length, position of the tubes relative to the direction of the main strains, presence of diagonal reinforcement elements, etc.) .
  • the size of the structure is variable and is mainly determined by the width and number of supported rows of reflectors (and hence the effective aperture of the optical concentrator) .
  • the material and diameter of the tubes being equal, the number of diagonal reinforcement elements will increase as a function of the dimensions of the structure module, and more specifically of the length of the crossmembers and longitudinal beams and the height of the top beam relative to the plane defined by the longitudinal beams and the crossmembers.
  • the addition of further diagonal reinforcement elements to those already present in the above- described base module may be evaluated on the basis of the results of structural calculations made for a specific implementation during the design stage.
  • FIG. 1 shows an isometric perspective view of a support structure module included in a system according to the present invention
  • FIG. 2 shows an isometric perspective view of the base of the module of Figure 1, wherein a diagonal beam is used during assembly in order to impose orthogonality of the sides of the quadrilateral;
  • FIG. 3 shows an isometric perspective view of the terminal module of a support structure according to the present invention
  • Figure 4 shows a perspective view and corresponding orthogonal sections of some details of Figure 1;
  • Figure 5 shows a perspective view and corresponding orthogonal sections of some details of Figure 1;
  • Figure 6 shows a perspective view and corresponding orthogonal sections of some details of Figure 1;
  • Figure 7 shows a perspective view and corresponding orthogonal sections of some details of Figure 1;
  • Figure 8 shows a perspective view and corresponding orthogonal sections of some details of Figure 3;
  • FIG. 9 shows a simplified block diagram of a system using panels made in accordance with the invention.
  • FIG. 10 shows an isometric perspective view of the module of Figure 1, whereon reflective panels and the conversion apparatus are mounted.
  • 100 designates a concentrated solar system in accordance with the present invention.
  • the system 100 ( Figure 9) preferably comprises a conversion apparatus 110, in which a heat transfer fluid flows in a duct and absorbs thermal energy irradiated onto said duct .
  • the system 100 further comprises a concentration structure
  • the concentration structure 120 comprises a plurality of reflective panels 130 and a modular support structure 140 for said reflective panels 130.
  • the reflective panels 130 are preferably Fresnel reflectors. Such reflectors may have a flat or slightly curved geometry .
  • the reflective panels 130 are arranged in a plurality of parallel rows, so as to form a sort of matrix.
  • the reflective panels 130 are associated with respective actuators, which allow the panels to be moved in order to follow the apparent motion of the sun.
  • the reflective panels 130 are arranged in such a way as to receive solar radiations and direct them towards the conversion apparatus 110.
  • the support structure 140 comprises a plurality of modules 1, all having substantially the same structure.
  • Figure 10 shows a module 1, whereon a plurality of rows of panels 130 are mounted.
  • the structural elements of the module 1, and in particular the crossmembers 3, which will be described below, preferably support the bearings and/or the actuators that support the transmission shafts of the solar tracking mechanism, whereon the panels 130 are in turn firmly connected .
  • Each module 1 comprises first and second frames la, lb, which are substantially equal to each other.
  • Each one of said first and second frames la, lb comprises a pair of uprights 2, a crossmember 3 and a pair of upper beams 5.
  • Each upper beam 5 extends from a respective end of the crossmember 3, so as to meet, at the opposite end, the other upper beam 5.
  • Each module 1 further comprises a pair of longitudinal beams 4 fixed at the upright-crossmember nodes to form a frame having a rectangular structure.
  • each module 1 comprises also a top beam 6 supported by the upper ends of said upper beams 5.
  • said conversion apparatus 110 is supported by the top beam 6.
  • one or more components of the conversion apparatus 110 are borne/supported by the top beam 6.
  • the conversion apparatus 110 may be hung to the top beam 6.
  • the Applicant has observed that when the system is in operation the conversion apparatus 110 reaches very high temperatures (around 200 °C-300 °C) , which cause it to undergo structural deformations, typically along the longitudinal direction. This can be taken into account by hanging the conversion apparatus 110 to the top beam 6 by means of sliding bearings, which will allow the apparatus to expand without generating any additional strains on the support structure 140.
  • the various elements so far described are tubes having a circular cross-section, preferably with an outside diameter of 48.3mm or l'-l/2 inches, cut to size orthogonally to the tube axis.
  • said elements are cut-to-size metal tubes having a circular cross-section, all having substantially the same inside diameter and outside diameter.
  • the beams that will be described hereinafter are preferably cut-to-size metal tubes with a circular cross-section having the same inside diameter and outside diameter as the elements already described .
  • the tube-to-tube junctions are effected by means of commercial joints made of malleable cast-iron and secured by means of a set screw, with the only exception of coaxial tube-to-tube junctions, which are preferably effected by means of a commercial friction joint made of cold-pressed steel ;
  • the preferred nominal diameter of the tubular beams is the one typically used for scaffolding, i.e. 1'- 1/2 (one inch and a half), corresponding to an outside diameter of 48.3 mm, but it is possible to use tubes having a nominal diameter ranging from l'-l/4 to 2' (one inch and a quarter to two inches), i.e. having an outside diameter ranging from 42 to 61 mm.
  • the tubes are rigidly connected to one another or, as far as the uprights 2 are concerned, to the support plane through commercial joints made of malleable cast iron and secured by means of a set screw, with the exception of coaxial tube-to-tube junctions, for which it is preferable to use friction joints made of cold-pressed steel and fastening bolts, like, for example, scaffolding joints.
  • the anchorage of the upright 2 to the support plane is preferably effected through the joint 12, which has a fastening flange and a blind bottom, as detailed in Figure 5.
  • the joint has two holes in the fastening flange, which are suitable for tightening by means of screws and bolts or chemical anchors.
  • Other types of joints may be effectively used as well, such as, for example, the joints 12a and 12b shown in Figure 5, which differ from the joint 12 in the number of anchorage holes, in the case of the joint 12a, or in the type of anchorage element, in the case of the joint 12b.
  • the joint 12b is suitable for immersion and inclusion into a concrete footing or plinth.
  • the fastening joint 13 connects the upright 2 to two crossmembers 3 and two longitudinal beams 4 adjacent thereto.
  • the joint 13 has a 5-way cross-like shape, four ways being coplanar cavities orthogonal to one another, and one way being a through cavity located at the centre of the cross in the direction orthogonal to the plane passing through said four cavities, as shown in detail in Figure 4.
  • the joint 13 may be replaced with two three-way cross-shaped joints 13c ( Figure 4), two ways of which are coaxial and one is an orthogonal through cavity.
  • the first one of the two joints 13c effects the connection between the upright 2 and two crossmembers 3, and the second one effects the connection between the same upright
  • the longitudinal beams 4 will lie in geometric planes parallel to but no longer coinciding with each other. Perpendicularity between crossmembers and longitudinal beams will be obtained via an adjustment to be carried out while assembling the structure, and will require suitable tools, e.g. the mounting jig 19 shown in Figure 2. The latter can be easily obtained from a cut-to-size tubular beam, like structural beams.
  • the joints 13d ( Figure 4) have to be positioned in a "T" fashion with one through cavity and one blind cavity orthogonal thereto, and the through cavity of one of the two joints is fitted onto one of the four uprights 2, e.g.
  • the upright 2a in Figure 2 by adjusting the angles between upright and crossmember and between upright and longitudinal beam, the position of the upright 2c, i.e. the one opposite to 2a along the diagonal direction, is brought to coincide with the centre of the through cavity of the second joint 13d. Because the length of the jig, calculated as the distance between the centres of the through cavities of the opposite joints 13d, is exactly the length of the geometric diagonal of the rectangular frame to be constructed, rectangularity of the quadrilateral will be ensured when the upright 2c is fitted into the through seat of the joint 13d.
  • the joint 13 can be effectively replaced with the joint 13a ( Figure 4), i.e. a four-way T-shaped joint with one through cavity and three coplanar cavities.
  • the joint 13a may be replaced with two joints, e.g. the joints 13c and 13d.
  • the joint 13c effects the connection between two consecutive longitudinal beams 4 and the upright 2
  • the joint 13d effects the junction between the upright 2 and the crossmember 3.
  • the joint 13a or, as an alternative, the two joints 13c and 13d may be used instead of the joint 13 shown in the drawing.
  • the joint 13b which is a three-way 90-degree angular joint with one through cavity, or, as an alternative, two joints 13d.
  • a ring 14 made of malleable cast iron and provided with a fixing set screw, is secured to the upright in abutment with the bottom edge of said joints.
  • the function of the ring 14 is to prevent the overlying joints from sliding along the upright due to an insufficiently tightened fixing set screw.
  • the ring may also be used as a reference and adjustment element when positioning the overlying joints in the vertical direction (i.e. along the upright) .
  • the dimensions of the support structure module are defined by the length of the distances between: A) two adjacent uprights in the direction of the crossmember, B) the end of the crossmember extension and the adjacent upright in the direction of the same crossmember, C) adjacent uprights in the direction of the longitudinal beam, and D) the axis of the top beam and the plane defined by the crossmembers.
  • the minimum and maximum lengths of said distances are: 1-6 metres for distance A) , 0-4 metres for distance B) , 3-6 metres for distance C) , and 1-6 metres for distance D) .
  • the tubes of the structure preferably have a length equal to or shorter than 6 metres, because this is the standard length of steel sections.
  • a linear junction between two tubes becomes necessary, which is preferably effected by means of friction joints 18 ( Figure 7) made of cold-pressed steel.
  • the diameter, thickness and material of the tubes being equal, the mechanical strength of the structure will decrease as the above-listed characteristic distances increase.
  • the structure can be reinforced with the addition of further diagonal tubular elements, as in reticular structures.
  • further diagonal tubular elements as in reticular structures.
  • circular sections having the same diameter, thickness and material as the structural beams are used also for the diagonal elements. The number and position of the diagonal elements depend on specific structural requirements of the support structure module of the present invention.
  • the inflection of the crossmember is limited through the use of two diagonal tubular beams 7, one end of which is fixed to the base of the upright 2, just above the joint 12 or the joint employed as an alternative, and the other end is fixed to the crossmember 3 near the centre thereof, i.e. near the point of maximum inflection.
  • the diagonal beam 7 is mostly subject to axial forces applied to the nodal points. While supporting the inflection of the crossmember, the diagonal beams 7 are subject to compression (or traction, if inflection occurs in the direction opposite to the weight, e.g. if the crossmember is subject to overturning forces generated by the wind) .
  • the structural assembly consisting of the upright, the crossmember and the diagonal beams recalls the scheme of a reticular structure in which the uprights and the diagonal beams are internal stiffening elements that are mainly subject to axial forces and only little deformation, and the crossmember is the upper bar (or chord) , although this scheme does not include the lower bar.
  • the diagonal beams 7 are fixed at the above-specified nodes by means of two combined joints 15, one with a blind cavity and the other with a through cavity, connected by means of a pin to form a hinge, as shown in detail in Figure 6.
  • the structure comprises further diagonal reinforcement tubes acting mechanically in a way similar to the diagonal beams 7 and, just like the latter, connected to the structure through the hinge joints 15.
  • the rectangular tubular frame so far described supports a truss-shaped tubular structure wherein the nodes of the two upper beams 5 are fixed one to the upright 2 and the other to the top beam 6.
  • the connection between the upright 2 and the top beam 5 is effected either by means of a variable-angle T- shaped joint 16 ( Figure 6) or by means of the hinge joint 15 already described.
  • the joint 16 the angle at the node between the upper beam and the crossmember may vary from a minimum value of 30 degrees to a maximum value of 60 degrees, whereas the hinge joint 15 allows any junction angle.
  • connection between the two upper beams 5 and the top beam 6 is effected by means of two T-shaped joints 17 coupled together and lowered to form an articulation, wherein each joint is similar to the joint 13d but, unlike the latter, the through cavity is modified so that the two blind cavities can be coplanar and at the same time perpendicular to the direction of the axis of the two through cavities.
  • the articulation 17 forms an angle that may vary from a minimum value of approx. 46° to a maximum value of approx. 314° (i.e.: 360° minus 46°) .
  • the top beams 6 are joined together without solution of continuity throughout the length of the metallic support structure.
  • Said joints 18 may either be internal to the module 1 or be positioned at the modules' junction node along the top beam.
  • the joint 18 is preferably a friction joint made of cold- pressed steel with a fastening bolt, similar to tubular scaffolding and/or framework joints.
  • a joint 18a shaped like an external sleeve and made of malleable cast iron may be used as an alternative, but such a joint will not ensure the same mechanical performance as the joint 18.
  • the top beam 5 preferably consists of a single continuous tube. However, (a) when its length exceeds 6 metres, i.e. the standard length of the initial tubular section (not yet cut to size) , and (b) when it is necessary to change direction in the connection between the upright 2 and the top beam 6, the upper beam 5 must be made up of two joined tubular beams.
  • the coaxial junction is preferably effected by means of the joint 18 or 18a, also used for joining the top beams.
  • variable-angle elbow joint 18b which can join the sections of upper beam 5 at angles that may vary from a minimum value of 120° to a maximum value of 165° (the 180° angle corresponds to a coaxial tube-to-tube junction) .
  • the structure may comprise further diagonal elements performing reinforcement and stiffening functions.
  • Figure 1 shows, by way of example, the reinforcement beams 10 and 11. Hinge joints 15 are used, as for the other diagonal reinforcement elements 7 and 9 previously introduced.
  • the purpose of this additional tubular element is to limit the deformations generated by the strains oriented along the direction of the top beam 6. If the vertical tube is positioned orthogonally to the support plane (being therefore also perpendicular to the top beam) , it can be anchored to the support plane by means of the same joint 12 as used for the uprights 2, or its variants 12a and 12b.
  • the joint that secures the vertical tube 21 to the keystone 6 several solutions may be adopted, such as, for example, the cross-shaped joint with overlapping arms 22, or the 90° elbow joints 22a, or the T-shaped joint 13d.
  • the preferred positioning of the tube 21 is diagonal, so that the beam will be mostly subject to compressive and tensile stresses.
  • the fixing to the top beam 6 can preferably be effected by means of the hinge joint 15, whereas anchorage to the ground can be effected by means of a hinge joint 23 ( Figure 8) similar to the joint 15, wherein one of the two parts making up the hinge joint is a perforated flange suitable for anchorage to the support plane by means of anchors, chemical anchors, or screws and bolts.

Abstract

L'invention concerne un système solaire à concentration (100) comprenant : un appareil de conversion (110) dans lequel un fluide de transfert de chaleur coule dans un conduit et absorbe l'énergie thermique irradiée sur ledit conduit ; une structure de concentration (120) conçue pour recevoir les rayonnements solaires et les transporter sur l'appareil de conversion (110), apportant ainsi de l'énergie thermique. La structure de concentration (120) comprend : une pluralité de panneaux réfléchissants (130) ; une structure de support modulaire (140) pour lesdits panneaux réfléchissants (130). Chaque module (1) de la structure modulaire (140) comprend des premier et second cadres, comprenant chacun : une paire de montants (2) ; une traverse (3) ; une paire de poutres supérieures (5), chaque poutre s'étendant à partir d'une extrémité de la traverse (3) afin de joindre l'autre poutre supérieure au niveau de l'extrémité opposée de manière à former, avec ladite traverse (3), une structure sensiblement triangulaire. Chaque module (1) de la structure modulaire (140) comprend en outre une paire de poutres longitudinales (4), chaque poutre longitudinale (4) reliant les extrémités correspondantes des traverses (3), la paire de poutres longitudinales (4) formant ainsi, avec les traverses, une structure sensiblement rectangulaire. Chaque module (1) de la structure modulaire (140) comprend finalement une poutre de partie supérieure (6) portée par les extrémités supérieures des poutres supérieures (5). Les montants (2), les traverses (3), les poutres supérieures (5), les poutres longitudinales (4) et les poutres de partie supérieure (6) sont tous fournis sous forme de tubes métalliques coupés aux dimensions et présentant une section transversale circulaire.
PCT/IB2018/051133 2017-02-27 2018-02-23 Système solaire à concentration WO2018154497A1 (fr)

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Citations (10)

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GB414805A (en) * 1933-03-09 1934-08-16 John Duff Improvements in and connected with steel or other tubular scaffolding used in building construction and other purposes
GB600431A (en) * 1945-10-16 1948-04-08 Acrow Eng Ltd Improvements in clamps for scaffolding tubes and like members
GB858520A (en) * 1957-02-27 1961-01-11 Torsten Lagerman Ab Improvements in connecting devices for scaffolding
WO1999042765A1 (fr) * 1998-02-19 1999-08-26 Suria Holdings, Societe A Responsabilite Limitee Dispositif de chauffage a l'energie solaire
US20050103326A1 (en) * 2003-11-19 2005-05-19 Michael Callahan Lighting systems
WO2011162670A2 (fr) * 2010-06-23 2011-12-29 Sapa Profiler Ab Structure de treillis et agencement de raccordement pour une telle structure
US20120160235A1 (en) * 2010-12-22 2012-06-28 Acciona Solar Power, Inc. Space frame for a solar collector
EP2660534A1 (fr) * 2010-12-30 2013-11-06 Europea De Construcciones Metálicas, S.A. Module support pour collecteur solaire à sous-structure triangulaire
US20140000581A1 (en) * 2011-03-14 2014-01-02 Commissariat A L'energies Atomique Et Aux Energies Alternatives Receiver module for solar power station with in-built thermal monitoring
FR3030022A1 (fr) * 2014-12-15 2016-06-17 Ssl Investissements Centrale solaire a concentration lineaire comprenant un ensemble de reflecteurs primaires

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB414805A (en) * 1933-03-09 1934-08-16 John Duff Improvements in and connected with steel or other tubular scaffolding used in building construction and other purposes
GB600431A (en) * 1945-10-16 1948-04-08 Acrow Eng Ltd Improvements in clamps for scaffolding tubes and like members
GB858520A (en) * 1957-02-27 1961-01-11 Torsten Lagerman Ab Improvements in connecting devices for scaffolding
WO1999042765A1 (fr) * 1998-02-19 1999-08-26 Suria Holdings, Societe A Responsabilite Limitee Dispositif de chauffage a l'energie solaire
US20050103326A1 (en) * 2003-11-19 2005-05-19 Michael Callahan Lighting systems
WO2011162670A2 (fr) * 2010-06-23 2011-12-29 Sapa Profiler Ab Structure de treillis et agencement de raccordement pour une telle structure
US20120160235A1 (en) * 2010-12-22 2012-06-28 Acciona Solar Power, Inc. Space frame for a solar collector
EP2660534A1 (fr) * 2010-12-30 2013-11-06 Europea De Construcciones Metálicas, S.A. Module support pour collecteur solaire à sous-structure triangulaire
US20140000581A1 (en) * 2011-03-14 2014-01-02 Commissariat A L'energies Atomique Et Aux Energies Alternatives Receiver module for solar power station with in-built thermal monitoring
FR3030022A1 (fr) * 2014-12-15 2016-06-17 Ssl Investissements Centrale solaire a concentration lineaire comprenant un ensemble de reflecteurs primaires

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