WO2008010031A1 - Simplified method for the creation of parabolic trough solar collectors - Google Patents

Simplified method for the creation of parabolic trough solar collectors Download PDF

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Publication number
WO2008010031A1
WO2008010031A1 PCT/IB2007/000808 IB2007000808W WO2008010031A1 WO 2008010031 A1 WO2008010031 A1 WO 2008010031A1 IB 2007000808 W IB2007000808 W IB 2007000808W WO 2008010031 A1 WO2008010031 A1 WO 2008010031A1
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WIPO (PCT)
Prior art keywords
parabolic
reflecting
laminar element
ribs
creation
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PCT/IB2007/000808
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French (fr)
Inventor
Alessandro Orioli
Original Assignee
Laterizi Gambettola S.R.L.
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Filing date
Publication date
Application filed by Laterizi Gambettola S.R.L. filed Critical Laterizi Gambettola S.R.L.
Publication of WO2008010031A1 publication Critical patent/WO2008010031A1/en

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
    • C08F214/18—Monomers containing fluorine
    • C08F214/22—Vinylidene fluoride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F214/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
    • C08F214/18—Monomers containing fluorine
    • C08F214/22—Vinylidene fluoride
    • C08F214/222—Vinylidene fluoride with fluorinated vinyl ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/16—Homopolymers or copolymers or vinylidene fluoride
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/18—Homopolymers or copolymers or tetrafluoroethene
    • 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
    • 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
    • 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 refers to a simplified method for the creation of parabolic trough solar energy collectors .
  • curved collectors are essentially composed of a cylindrical surface of reflecting parabolic section, in the focus of which a tube is situated through which a fluid runs,- the fluid is heated due to sun rays reflected by the reflecting surface.
  • curved reflecting surfaces are made composed of folded plates of stainless steel, mirrors of about four millimetre thickness, heat bent according to the required cylindrical surface of parabolic section, or another solution used is that of forming curved panels composed of composite materials of adequate thickness for ensuring the necessary rigidness and coated with a reflecting surface.
  • the method for the creation of parabolic trough solar collectors is composed of a sequence of steps of which the most important are the hot deformation of the lamina, generally in glass, and the subsequent application of a thin reflecting layer on its rear surface.
  • the bending precision of the reflecting lamina is a very important factor since it determines the direction in which the calorific power of the sun rays is directed. In the field of making solar ray concentrators, then, it is of extreme importance to make profiles in which the margin of error is reduced to the smallest possible value.
  • Object of the present invention is that of achieving a method capable of resolving the above mentioned drawbacks of the prior art in an extremely simple, economical and particularly functional manner.
  • Another object is that of achieving a simplified method for the creation of parabolic trough solar collectors in which the step of bending the reflecting lamina, on which a reflecting layer was previously applied, is a cold bending step, due to the elasticity of the same lamina .
  • Figure 1 is anterior-lateral perspective view of a possible embodiment of a parabolic trough solar collector obtained by means of the method, object of the invention,-
  • Figure 2 is lateral perspective view of a possible embodiment of a portion of a shaped rigid support of the parabolic trough solar collector of figure 1, obtained by means of the method, object of the invention;
  • Figure 3 is a lateral perspective view of the same embodiment of the shaped rigid support of figure 2;
  • Figure 4 is a rear perspective view of a portion of a possible embodiment of a parabolic trough solar collector obtained by means of the method, object of the invention.
  • Figure 5 is a rear perspective view of a portion of another embodiment of a parabolic trough solar collector obtained by means of the method, object of the invention.
  • a concentrator of solar rays 10 is shown and it is composed of a rigid support 11 composed of at least two parallel ribs of small thickness, parallel, shaped according to a same particular parabolic curve 12, the two ribs 12 being rigidly connected either by crossbars 13 and/or by the general support structure of several flanked parabolic collectors.
  • a support of this type essentially composed of a limited number of ribs of small thickness 12, at least two connected with each other, can be made in various modes, preferably by means of the use of numerical control machines which ensure, in an economical manner, a high cutting precision of the ribs with respect to a theoretical profile.
  • such ribs of small thickness 12 can be made with plasma cutting, precise and very economic, or with laser cutting, very precise and slightly more expensive than the preceding cutting technique.
  • a laminar reflecting element 15 On top of the rigid support of parabolic form 11 is arranged a laminar reflecting element 15 having an anterior surface 16, which is direct to the sun rays, and an rear surface 17.
  • the reflecting property of the laminar element 15 can be ensured when it is consists by a laminar transparent element on the whose rear surface 17 is distributed a reflecting material, as an example silver varnish that it reflects the sun rays towards the anterior surface 16.
  • the above cited reflecting laminar element 15 can be a glass laminar element, a laminar transparent plastic element, or an stainless steel/aluminum laminar element.
  • a glass laminar element 15 second the invention it is previewed to glue, in general preliminarily to the successive curving, on the surface in contact with the rigid support 11, a woven or one net or in general a protecting material in order to withhold eventual fragments of glass in case of breach of the same element .
  • the reflecting laminar element 15 After the disposition of the reflecting laminar element 15 over the rigid support of parabolic shape 11, it is applied on its outer surface 16, which is not the surface in contact with the rigid support 11, an increasing pressure such to progressively bend the laminar element 15 due to the elasticity of the above cited materials, until it has cylindrical parabolic curved shape corresponding to that of the parallel ribs of the same parabolic shape 12 on which it is based. Due to the above mentioned pressure, the reflecting laminar element 15, elastically curved in several portions of its rear surface 17 in contact with the rigid support 11, it is now in contact with the long and narrow parabolic shaped surfaces of the ribs 12. Such coupling is maintained even after having released the pressure, due to reciprocal binding means 14, 14' between the reflecting laminar element 15 elastically curved and the parabolic ribs 12 and/or the rigid support 11.
  • the reciprocal binding means 14, 14' are a paste or a putty 14 distributed on the surface and/or on the flanks of the parabolic ribs 12 in the contact part of the parabolic ribs 12 with the reflecting laminar element 15, or, according to another embodiment, a plurality of spring elements or generally elastic elements 14' are represented whose ends are bound on one side to the parabolic ribs 12 and/or to the rigid support 11 and on the other side to the reflecting laminar element 15.
  • the application of the abovementioned plurality of spring elements or generally elastic elements 14' has the advantage of reducing the danger of breaking due to the stress induced by the thermal expansions.
  • the reciprocal binding means are such to allow relative thermal expansions between the elements that compose the rigid support 11 and the element 15.
  • the bending of the reflecting laminar element flat and its coupling with the parabolic support occurs simultaneously and with cold working.
  • the reflecting laminar element flat is elastically cold deformed to form a parabolic curve through the application of pressure on its outer surface, only after have been previously based on the rigid support of parabolic form. With the increase of the pressure in this manner, both the bending of the laminar element and a geometrically advantageous coupling with the curved rigid support are simultaneously obtained.
  • the curvature of the reflecting laminar element thus obtained is very precise, due to the impossibility of the above cited materials, which can compose the reflecting laminar element, to become convex, i.e. to take two radii of curvature lying on planes orthogonal from each other.
  • the laminar element elastically deformed, automatically assumes a shape of the rigid support on which it has been arranged.
  • Such coupling is maintained even after having released the pressure by applying reciprocal binding means between the laminar element made curved and the parabolic ribs.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Sustainable Development (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Sustainable Energy (AREA)
  • Thermal Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

A simplified method for the creation of parabolic trough solar collectors (10) composed of a reflecting laminar element (15) having an anterior surface (16) and an rear surface (17) , comprising the following steps : a) arranging the rear surface (17) of said reflecting laminar element (15) substantially- flat on a rigid support (11) composed of at least two ribs (12) of small thickness, parallel, shaped according to a same parabola and arranged parallel from each other so that the parabolas correspond to the sections of one cylindrical surface with parabolic section, and applying an increasing pressure on said anterior surface (16) until the reflecting laminar element (15) is elastically bent in accordance with said parallel and parabolic ribs (12) ; b) binding the reflecting laminar element (15) elastically bent to said at least two parallel and parabolic ribs (12) and/ or to the rigid support (11) by means of binding (14, 14') .

Description

SIMPLIFIED METHOD FOR THE CREATION OF PARABOLIC TROUGH SOLAR COLLECTORS
The present invention refers to a simplified method for the creation of parabolic trough solar energy collectors .
Presently the method for making curved collectors is quite extensive. These curved collectors are essentially composed of a cylindrical surface of reflecting parabolic section, in the focus of which a tube is situated through which a fluid runs,- the fluid is heated due to sun rays reflected by the reflecting surface. Up to the present day, curved reflecting surfaces are made composed of folded plates of stainless steel, mirrors of about four millimetre thickness, heat bent according to the required cylindrical surface of parabolic section, or another solution used is that of forming curved panels composed of composite materials of adequate thickness for ensuring the necessary rigidness and coated with a reflecting surface. Generally, the method for the creation of parabolic trough solar collectors is composed of a sequence of steps of which the most important are the hot deformation of the lamina, generally in glass, and the subsequent application of a thin reflecting layer on its rear surface.
However, even if the just described procedure seems simple, it requires very sophisticated technology. Such requirement derives from the fact that, according to the above-described known procedure, the fundamental steps to be carried out, which as already mentioned above are the bending of the reflecting lamina and the subsequent application of the reflecting layer, occur at different times and separate from each other with suitable machines and sophisticated methods.
Thus a critical aspect of the mentioned known procedures for the production of curved mirrors consists of the fact that the deformation of the reflecting lamina, mainly occurring by means of the use of hot deformation machines, often has geometric bending errors with respect to the required theoretical curve .
In fact, the bending precision of the reflecting lamina is a very important factor since it determines the direction in which the calorific power of the sun rays is directed. In the field of making solar ray concentrators, then, it is of extreme importance to make profiles in which the margin of error is reduced to the smallest possible value. A hot deformation of the reflecting lamina, for example in glass, therefore foresees the need to have suitable templates which characterise the final form, with construction costs of the same and the costs of stock on hand.
In addition, the problems connected to the arrangement and application of the reflecting layer on the lamina thus curved must not be ignored.
Object of the present invention is that of achieving a method capable of resolving the above mentioned drawbacks of the prior art in an extremely simple, economical and particularly functional manner.
Another object is that of achieving a simplified method for the creation of parabolic trough solar collectors in which the step of bending the reflecting lamina, on which a reflecting layer was previously applied, is a cold bending step, due to the elasticity of the same lamina .
These objects according to the present invention are achieved by making a simplified method for the creation of parabolic trough solar collectors as set forth in claim 1.
Further characteristics of the invention are shown by the following claims.
The characteristics and advantages of a simplified method for the creation of parabolic trough solar collectors according to the present invention will be clearer from the following exemplifying and non- limiting description, referred to the enclosed schematic drawings in which:
Figure 1 is anterior-lateral perspective view of a possible embodiment of a parabolic trough solar collector obtained by means of the method, object of the invention,-
Figure 2 is lateral perspective view of a possible embodiment of a portion of a shaped rigid support of the parabolic trough solar collector of figure 1, obtained by means of the method, object of the invention;
Figure 3 is a lateral perspective view of the same embodiment of the shaped rigid support of figure 2; Figure 4 is a rear perspective view of a portion of a possible embodiment of a parabolic trough solar collector obtained by means of the method, object of the invention; and
Figure 5 is a rear perspective view of a portion of another embodiment of a parabolic trough solar collector obtained by means of the method, object of the invention.
With reference to the figures, possible embodiments are shown of a parabolic trough solar collector 10 made according to the method which is the object of the invention.
In particular, a concentrator of solar rays 10 is shown and it is composed of a rigid support 11 composed of at least two parallel ribs of small thickness, parallel, shaped according to a same particular parabolic curve 12, the two ribs 12 being rigidly connected either by crossbars 13 and/or by the general support structure of several flanked parabolic collectors.
A support of this type essentially composed of a limited number of ribs of small thickness 12, at least two connected with each other, can be made in various modes, preferably by means of the use of numerical control machines which ensure, in an economical manner, a high cutting precision of the ribs with respect to a theoretical profile. Advantageously, according to the present invention, such ribs of small thickness 12 can be made with plasma cutting, precise and very economic, or with laser cutting, very precise and slightly more expensive than the preceding cutting technique. Alternatively, it is also possible to use traditional numerical control machine tools, even if this cutting typology involves an increase in the production costs with respect to the two above described methods for making ribs of small thickness 12. On top of the rigid support of parabolic form 11 is arranged a laminar reflecting element 15 having an anterior surface 16, which is direct to the sun rays, and an rear surface 17.
As an example the reflecting property of the laminar element 15 can be ensured when it is consists by a laminar transparent element on the whose rear surface 17 is distributed a reflecting material, as an example silver varnish that it reflects the sun rays towards the anterior surface 16.
According to some preferential embodiments the above cited reflecting laminar element 15 can be a glass laminar element, a laminar transparent plastic element, or an stainless steel/aluminum laminar element. Using a glass laminar element 15 second the invention it is previewed to glue, in general preliminarily to the successive curving, on the surface in contact with the rigid support 11, a woven or one net or in general a protecting material in order to withhold eventual fragments of glass in case of breach of the same element . After the disposition of the reflecting laminar element 15 over the rigid support of parabolic shape 11, it is applied on its outer surface 16, which is not the surface in contact with the rigid support 11, an increasing pressure such to progressively bend the laminar element 15 due to the elasticity of the above cited materials, until it has cylindrical parabolic curved shape corresponding to that of the parallel ribs of the same parabolic shape 12 on which it is based. Due to the above mentioned pressure, the reflecting laminar element 15, elastically curved in several portions of its rear surface 17 in contact with the rigid support 11, it is now in contact with the long and narrow parabolic shaped surfaces of the ribs 12. Such coupling is maintained even after having released the pressure, due to reciprocal binding means 14, 14' between the reflecting laminar element 15 elastically curved and the parabolic ribs 12 and/or the rigid support 11.
Without the use of these reciprocal binding means 14, 14', in fact, once the pressure is released the reflecting laminar element 15 would tend to reassume its original flat form.
In the shown embodiments, the reciprocal binding means 14, 14' are a paste or a putty 14 distributed on the surface and/or on the flanks of the parabolic ribs 12 in the contact part of the parabolic ribs 12 with the reflecting laminar element 15, or, according to another embodiment, a plurality of spring elements or generally elastic elements 14' are represented whose ends are bound on one side to the parabolic ribs 12 and/or to the rigid support 11 and on the other side to the reflecting laminar element 15.
The application of the abovementioned plurality of spring elements or generally elastic elements 14' has the advantage of reducing the danger of breaking due to the stress induced by the thermal expansions. In fact according to the invention the reciprocal binding means are such to allow relative thermal expansions between the elements that compose the rigid support 11 and the element 15.
Alternatively can also be used such reciprocal binding means between the rigid support 11 and the laminar element 15 some through screw.
It is entirely easy to understand which are the steps which lead to the making of a linear parabolic solar energy collector obtained by means of the method, object of the invention. According to the present method, the bending of the reflecting laminar element flat and its coupling with the parabolic support occurs simultaneously and with cold working. In fact, the reflecting laminar element flat is elastically cold deformed to form a parabolic curve through the application of pressure on its outer surface, only after have been previously based on the rigid support of parabolic form. With the increase of the pressure in this manner, both the bending of the laminar element and a geometrically advantageous coupling with the curved rigid support are simultaneously obtained.
The curvature of the reflecting laminar element thus obtained is very precise, due to the impossibility of the above cited materials, which can compose the reflecting laminar element, to become convex, i.e. to take two radii of curvature lying on planes orthogonal from each other.
In fact, a flat glass and also the flat plastic of small thickness, only bending in one direction and thus inhibiting any other bending in the orthogonal direction, in such a manner very precisely follow the shaped profile of the support.
Moreover, the use of laminar elements already covered with a reflecting layer permits further reducing the procedure, since a subsequent step in which this layer is applied is not necessary.
The procedure described here is shorter and more economical than those known. In fact, a silver reflecting glass or plastic laminar element is easily found and does not require the use of machines for hot deformation.
Such procedure reduces to a minimum the problems regarding possible errors of the laminar element bending with respect to the shape of the rigid support of parabolic form, permitting the attainment of the desired forms such as a cylindrical surface of parabolic section.
In fact, the laminar element, elastically deformed, automatically assumes a shape of the rigid support on which it has been arranged. Such coupling is maintained even after having released the pressure by applying reciprocal binding means between the laminar element made curved and the parabolic ribs.
One can thus avoid the need to have available in stock an entire series of templates or moulds for the hot treatment of the reflecting sheet so to obtain its curvature .
It has thus been seen that a simplified method for the creation of parabolic trough solar collectors according to the present invention achieves the objects underlined above.
The simplified method for the creation of parabolic trough solar collectors of the present invention thus conceived is susceptible to a number modifications and variants, all falling within the same inventive concept .

Claims

1. Simplified method for the creation of parabolic trough solar collectors (10) composed of a reflecting laminar element (15) having an anterior surface (16) and an rear surface (17) , comprising the following steps: a) arranging said rear surface (17) of said reflecting laminar element (15) substantially- flat on a rigid support (11) composed of at least two parallel ribs (12) of small thickness, parallel, shaped according to a same parabola and arranged parallel from each other so that the parabolas correspond to the sections of one cylindrical surface with parabolic section, and applying increasing pressure on said anterior surface (16) until said reflecting laminar element (15) is elastically curved in accordance with said parallel and parabolic ribs (12) ; b) binding said reflecting laminar element (15) elastically curved to said at least two parallel and parabolic ribs (12) and/or to said rigid support (11) by means of reciprocal binding means (14, 14') .
2. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 1 characterised in that said reflecting laminar element (15) is a glass laminar element.
3. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 2 characterised in that it also comprises the step of gluing on said surface of said reflecting laminar element (15) in contact with said rigid support (11) a protecting material in order to withhold eventual fragments of glass in case of breach of said glass laminar element.
4. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 1 characterised in that said reflecting laminar element
(15) is a transparent plastic laminar element.
5. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 1 characterised in that said reflecting laminar element (15) is a aluminium laminar element.
6. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 1 characterised in that said reflecting laminar element (15) is a stainless steel laminar element.
7. Simplified method for the creation of parabolic trough solar collectors (10) according to any previous claim characterised in that it also comprises the preliminary construction step of said rigid support of parabolic form (11) by means of the rigid coupling of said at least two ribs of small thickness (12) , shaped according to a same parabola, positioned in such a manner to be parallel to each other and to realize a cylindrical surface of parabolic section, said at least two ribs (12) being rigidly connected either by at least one crossbar (13) and/or by a general support structure of several flanked parabolic collectors (10) .
8. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 7 characterised in that said at least two ribs of small thickness (12) are made by means of plasma cutting.
9. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 7 characterised in that said at least two ribs of small thickness (12) are made by means of laser cutting.
10. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 7 characterised in that said at least two ribs of small thickness (12) are made by means of numerical control machine tools.
11. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 7 or 8 or 9 or 10 characterised in that the coupling of said at least two ribs (12) with said at least one crossbar (13) and/or said general support structure is made by means of stable binding.
12. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 11 characterised in that the step of applying said reciprocal binding means (14) between said reflecting laminar element (15) elastically deformed and said at least two ribs of parabolic form (12) is achieved through a previous distribution of a paste or a putty (14) on the surface and/or on the flanks of said at least two parabolic ribs (12) in the contact part of said at least two parabolic ribs (12) with said reflecting laminar element (15) .
13. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 11 characterised in that the step of applying said reciprocal binding means (14') between said reflecting laminar element (15) elastically deformed and said at least two ribs of parabolic form (12) is achieved through the positioning of a plurality of elastic elements, or in particular by springs (14'), whose ends are bound on one side to said at least two ribs (12) and/or to said at least one crossbar (13) and/or to said general support structure and on the other side to said reflecting laminar element (15) .
14. Simplified method for the creation of parabolic trough solar collectors (10) according to claim 11 characterised in that the step of applying said reciprocal binding means (14, 14') between said reflecting laminar element (15) elastically deformed and said at least two ribs of parabolic form (12) is achieved through the positioning of a plurality of through screws, whose ends are bound on one side to said at least two ribs (12) and/or to said at least one crossbar (13) and/or to said general support structure and on the other side to said reflecting laminar element (15) .
15. Trough solar collectors (10) of solar energy realized according to one or more of the previous claims .
PCT/IB2007/000808 2006-07-17 2007-03-15 Simplified method for the creation of parabolic trough solar collectors WO2008010031A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2006A001381 2006-07-17
IT001381A ITMI20061381A1 (en) 2006-07-17 2006-07-17 SIMPLIFIED METHOD FOR THE CREATION OF LINEAR PARABOLIC COLLECTORS OF SOLAR ENERGY

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101980063A (en) * 2010-09-10 2011-02-23 何斌 One-dimensional light-condensing drawing-formed groove-type parabolic mirror and manufacturing method thereof
WO2011092246A3 (en) * 2010-02-01 2012-02-02 Solarlite Gmbh Segment of a solar collector and solar collector

Citations (11)

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GB485390A (en) * 1936-11-24 1938-05-19 British Thomson Houston Co Ltd Improvements in and relating to reflectors
US4119365A (en) * 1976-04-30 1978-10-10 Roger Andrew Powell Trough reflector
US4135493A (en) * 1977-01-17 1979-01-23 Acurex Corporation Parabolic trough solar energy collector assembly
DE2738597A1 (en) * 1977-08-26 1979-03-01 Maschf Augsburg Nuernberg Ag Solar heat reflector unit - comprises mirror adjustably clamped in supporting frame shaped to correspond to mirror surface geometry
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