Modular support structure for reflective films

Abstract

A modular support structure (30) for a sheet of reflective film (F) has a structure (30) formed by a plurality of base modules (32). Each base module (32) is formed by a first welded metal net (34) consisting of a plurality of parallel and spaced-apart longitudinal elements (L) connected to one another by a plurality of parallel and spaced-apart transverse elements (TT). The transverse elements (TT) and the longitudinal elements (L) are metal profiles welded to one another and arranged orthogonally to one another to form a chessboard with through openings (A). A second tight mesh metal net (40) with folded longitudinal edges (42) is resting on the first welded metal net (34). The reflective film sheet (F) is inserted so as to be fixed to the second tight mesh metal net (40) at said folded longitudinal edges (42) by means of holding elements (F1 ). The second tight mesh metal net (40) is fixed to the first welded metal net (34) with fastening elements (50). The base module (32) is fixed to the ground using mounting elements (35) which cooperate with the longitudinal elements (L). Each base module (32) is sized so that once the reflective film sheet (F) is mounted, it has a slope of at least 1° with respect to the plane of the ground and is inclined to facilitate the water flowing.

Description

[0001] “MODULAR SUPPORT STRUCTURE FOR REFLECTIVE FILMS”

[0002] * * * * *

[0003] FIELD OF THE INVENTION

[0004] The present invention relates to the field of ground-mounted bifacial photovoltaic modules. In particular, the present invention relates to a modular support structure for reflective films to be used in the fields of ground-mounted bifacial photovoltaic modules.

[0005] PRIOR ART

[0006] In the prior art, it is known to create bifacial photovoltaic module plants.

[0007] A first problem encountered in this type of solutions is that the terrain normally is not very reflective.

[0008] Therefore, reflective films to be positioned on the ground below the bifacial photovoltaic modules were invented in the background art. In this case however, the reflective film gets dirty quickly and considerably decreases its light reflecting ability.

[0009] SUMMARY OF THE INVENTION

[0010] The object of the invention was achieved by a modular support structure as defined in claim 1.

[0011] BRIEF DESCRIPTION OF THE FIGURES

[0012] Hereafter in this description, reference will be made to the drawings shown in the accompanying figures, in which:

[0013] Figure 1 A shows a section of a bifacial photovoltaic module system with a support structure for a reflective film to increase the production of electric energy;

[0014] Figure 1 B shows a side view of the plant section;

[0015] Figure 2 shows a side view of a first embodiment of the support structure for the reflective film;

[0016] Figure 3 shows a bottom view of the support structure for the reflective film of Figure 2;

[0017] Figures 4, 5, and 6 show enlarged details of the support structure for the reflective film and of examples of ground or terrain fastening means and of examples of fastening means for the reflective film;

[0018] Figures 7, 7a, 8 and 9 show enlarged details of the support structure for the reflective film and of examples of ground or terrain fastening means and of examples of fastening means for the reflective film; Figure 10 shows an overall view of a second embodiment of the support structure for the reflective film;

[0019] Figure 1 1 shows an example of a bifacial photovoltaic module plant with a support structure for a reflective film;

[0020] Figure 12 and Figure 13 show views of a third embodiment of the support structure for the reflective film;

[0021] Figure 14 shows configuration types of the single modules forming the modular support structures, part of the complete structure of reflective film;

[0022] Figure 15 shows an exploded view of some parts of Figure 14;

[0023] Figure 16 shows an exploded view of the third embodiment shown in Figure 12 and 13;

[0024] Figures 17 and 18 show top views and perspective views of the third embodiment, and

[0025] Figure 19 and Figure 20 show the configuration of the third embodiment which allows rotating the grid for purposes of maintenance and accessibility to the ground under the structure.

[0026] The parts according to the present description are represented in the drawings, when suitable, employing conventional symbols, showing only the specific details that lead to understanding the embodiments of the present invention, so as not to highlight details that will be immediately apparent to the person skilled in the art, with reference to the description provided below.

[0027] DETAILED DESCRIPTION OF THE INVENTION

[0028] The solution according to the present invention will now be described with the help of drawings.

[0029] Figure 1 A shows a section 10 of a plant 1 comprising a plurality of bifacial photovoltaic modules 12.

[0030] In such an embodiment, plant 1 is installed on the ground, in a substantially flat field or terrain.

[0031] As is known, a photovoltaic plant for producing electric energy consists of a series of photovoltaic modules mounted on sun seekers which modify the inclination thereof by following the path of the sun during the day, or alternatively, mounted in a fixed manner with a given inclination with respect to the terrain or ground.

[0032] The power of the plant depends on the number of photovoltaic modules used, and a photovoltaic plant occupies a vast area of terrain.

[0033] The term “albedo” relates to the reflective power of the given surface, i.e. , the fraction of sunlight reflected in all directions. If an albedo factor equal to 1 indicates that all the incident light is reflected, a 0 factor instead signals that the light radiation is completely absorbed by the contact surface, and therefore there is no light reflected.

[0034] The albedo factor depends on several features of the surface, such as color, shape or radiation angle.

[0035] The albedo value of the surface on which the modules are installed therefore directly affects the performance of the bifacial modules, which production increase is based on the possibility of also exploiting the portion of light reflected.

[0036] The albedo effect is considered mainly for bifacial modules due to the bifacial gain. But a scattered reflectance bottom is advantageous also for the front side of the modules and for monofacial module installations.

[0037] In addition to this key factor, however, it is essential for the structure on which the panel is mounted to allow the reflected light to reach the rear part of the photovoltaic module, avoiding shadows generated by the support system as much as possible.

[0038] Given their modularity, bifacial photovoltaic modules 12 are supported by a fixed or movable structure 14 adapted to keep the bifacial photovoltaic modules 12 oriented and inclined to optimize the production of electric energy.

[0039] Structure 14 comprises metal profiles in the form of crosspieces 15 carried by other load-bearing metal profiles creating vertical supports 16. The crosspieces 15 may rotate, following the sun in the event of sun seeker, or remain fixed.

[0040] Obviously, given that the photovoltaic modules 12 are bifacial, i.e., of the type that generates electric energy on both “faces” of the module, there is a need for each module 12 to have most of its surface unobstructed.

[0041] Therefore, structure 14 is studied to be as compact as possible, without however reducing sturdiness.

[0042] Structure 14 is made so that the rear side of the panel is as free of obstacles as possible.

[0043] As is known, bifacial photovoltaic modules 12 are such as to also exploit the reflected light, i.e., the one which, “bouncing off’ the surface of the terrain, reaches the rear part of the solar module.

[0044] Therefore, as shown in Figure 1 B, each photovoltaic module 12 has a main face 12a oriented so as to be illuminated by direct sunlight, and a secondary face 12b, facing and opposite the main face 12a, for capturing the light reflected by the terrain.

[0045] Bifacial modules aim to also exploit a portion of light reflected from the terrain, ensuring a production increase between 10 and 30% with respect to a conventional monofacial module.

[0046] Hence the idea to create reflective films F to be installed below the bifacial photovoltaic modules 12.

[0047] To obviate the most relevant problems related to installing such reflective film, such as:

[0048] - the dirt resulting from particles in the air,

[0049] - soil residuals transported by water in the event of rain and wind,

[0050] - the total covering of the terrain with waterproofing effect in the long-term, due to the lack of water drainage.

[0051] The present invention consists in designing and developing a support structure 20 for installing reflective film sheets F for a photovoltaic production plant 1 .

[0052] The support structure 20 has to be of the modular type to be easily transportable and has to be integrable with the existing photovoltaic installation structures.

[0053] Moreover, the modular support structure 20 has to be studied to allow quick mounting in order to reduce installation times and costs.

[0054] Preferably, the modular support structure 20 has to be easily removable, or foldable on a side, to allow access for scheduled and extraordinary maintenance.

[0055] Finally, the modular support structure 20 has to be resistant to wind and the weather elements.

[0056] The present invention aims to provide a permanent solution for increasing the performance of ground-mounted bifacial photovoltaic systems, with a modular support structure 20 for a reflective film F.

[0057] The modular support structure 20 is studied to increase the life and facilitate the selfcleaning of the reflective film F.

[0058] The reflective film F is selected from a class of new high-performance materials.

[0059] The main performance factors of the materials increasing the production of solar energy in a bifacial photovoltaic plant are:

[0060] - high reflectance (between 60 and 100%),

[0061] - long-term outdoor durability (materials resistant to UV rays), - self-cleaning properties (hydrophobic or superhydrophobic), and

[0062] - low production, installation and maintenance costs.

[0063] The combination of reflectance and durability is the most difficult to obtain.

[0064] Figures 2 and 3 show a first embodiment of the modular support structure 20. It has a reticular grid structure formed by a plurality of base modules 22 repeated so as to form a structure having dimensions equal to about double the width of the bifacial photovoltaic modules 12.

[0065] Figures 2 and 3 show a single-span embodiment. Each base module 22 forming structure 20 is single-span and the base modules 22 are arranged over two parallel rows.

[0066] This type of single-span embodiment reduces the installation costs and number of pieces. However, since half of the structure has an angle opposite to the sun rays, it is an embodiment which is less effective than the other one described and shown in Figure 10. From a plan view, each base module 22 is therefore formed by a plurality of transverse elements TR connected to one another by longitudinal elements L.

[0067] The transverse elements TR and the longitudinal elements L are metal profiles connected to one another in a grid form using an automated metal electro-welding technique.

[0068] Each metal profile has a round section with a diameter comprised between 2 and 15 mm, preferably between 4 and 6 mm, or a rectangular section with side dimensions comprised between 2 and 15 mm, preferably between 4 and 6 mm.

[0069] The profiles forming the transverse elements TR and the longitudinal elements L may be solid or empty in a tubular shape.

[0070] The transverse elements TR and the longitudinal elements L are arranged orthogonally to one another to form a chessboard with rectangular- or square-shaped through- openings A.

[0071] Such through-openings A are useful in case of maintenance; indeed, such openings allow the passage of maintenance personnel once the reflective film F is removed so they can reach all zones of plant 1 .

[0072] Each base module 22 has a structure with a single-span side profile and an inverted V slope, with the terminal ends folded. The side profile, which sees the transverse elements TR, provides two linear segments T made from metal profiles extending from a common vertex V. The reflective film F is applied on a horizontal surface or on the ground, preferably on a support structure with a slope of at least 1 °, to facilitate the removal of dust using flowing water, rainwater or water used for cleaning the reflective film F.

[0073] The linear segments T are inclined by an angle of at least 1 ° and preferably of 7° with respect to a line tangent to vertex V, coplanar to the segments T, and parallel to the terrain.

[0074] Another terminal segment T 1 is connected to each free end of the segments T, in which such an end segment T1 is inclined by an angle of about 45° with respect to a straight line comprising the extension of the linear segment T, but any angle is acceptable; it is not relevant for the solution herein proposed.

[0075] The inclination of the linear segments T is studied so as to facilitate the flowing of rainwater or water used for cleaning and maintenance, and therefore the self-cleaning of the reflective film F.

[0076] In particular, in the embodiment shown in Figure 3, each base module 22 comprises seven transverse elements TR and six longitudinal elements L.

[0077] A first longitudinal element L1 joins all free ends of the terminal segments T1 of a first side to one another, a second longitudinal element L2 joins all free ends of the linear segments T of the first side to one another, and a third line element L3 joins the median portions of the linear segments T of the first side to one another. On the other side, opposite the common vertex V, there is a dual situation with three other longitudinal elements L arranged in a symmetrical manner with respect to L1 , L2 and L3.

[0078] The distance between the first longitudinal element L1 and the second longitudinal element L2 is equal to the length of an end segment T1 .

[0079] The modular support structure 20 includes different base modules 22 arranged side- by-side in orderly rows and in columns such to cover most of the terrain under plant 1 so that all the sunlight reaching the surrounding terrain is reflected towards the secondary face 12b of each bifacial photovoltaic module 12.

[0080] As mentioned, the modular support structure 20 of the reflective film sheets F is arranged on the ground and is fixed to the ground using mounting elements, such as, for example, special screws S and plates P.

[0081] The plates P have a central portion PC provided with a slotted hole for receiving screw S and two side portions PL folded and shaped like an inverted U.

[0082] The two side portions PL folded and shaped like an inverted U are sized so as to cooperate with the profiles forming the first longitudinal elements L1 of two base modules 22.

[0083] Two facing base modules 22 are fixed to the terrain using at least one pair of plates P and screws S.

[0084] The reflective film sheets F have slots AS reinforced by metal rings on the four comers thereof and on the long sides so as to be fixed to the modular support structure 20.

[0085] In particular, such reinforced slots AS cooperate with fastening elements, such as, for example springs M. The fastening elements, for example in the form of springs M, have an elastic middle body M and two hooked-shaped end portions G for coupling with the profiles forming the first longitudinal elements L1 on one side and with said reinforced slots AS of the reflective film sheets F on the other.

[0086] The fastening elements M are designed to facilitate and speed up the installation operation and subsequent maintenance operations.

[0087] Once the reflective film sheet F is removed, the modular support structure 20 is uncovered to allow maintenance by accessing the photovoltaic solar modules without removing the modular structure 20.

[0088] The through openings A are at least 25 cm to allow the maintenance of and access to the bifacial photovoltaic solar panels 12 without removing the modular structure 20 from the ground.

[0089] Preferably, but not necessarily, the modular support structure 20 is studied to have, for example, a distance from the plane of the ground of at least 2-5 cm, to avoid the terrain dust from depositing on the reflective film F.

[0090] In certain embodiments, the reflective film sheet F is sized so as to allow the reflective film F to reach the ground with two sides to minimize the passage of wind in the lower part of the support structure.

[0091] Figure 10 shows a second embodiment of the modular support structure 20 with base modules 24.

[0092] In Figure 3, the base module 22 is an alternative embodiment, with a single instead of a double span, with an inverted-V slope, instead of parallel.

[0093] In this case, each base module 24 has a structure with a seagull wing-shaped side profile with the terminal ends folded. The side profile, which sees the transverse elements TR, includes two linear segments T4 and T5 made from metal profiles extending from a common vertex V1 . The linear segments T4 and T5 are inclined by an angle of about 45° with respect to a line tangent to vertex V, coplanar to the linear segments T4 and T5. Another linear segment T3 and T6 is connected at each free end of the segments T4 and T5, in which such segments T3 and T6 are inclined with respect to the terrain.

[0094] A terminal segment T2 and a terminal segment T7 are connected to each free end of the segments T3 and T6, respectively, in which such terminal segments T2 and T7 are inclined with respect to a line comprising an extension of the terminal segment T2 and terminal segment T7.

[0095] Preferably, the terminal segment T2 is longer than the terminal segment T7, giving structure 20 a greater inclination from side T2 with respect to side T7.

[0096] In particular, in the embodiment shown in Figure 10, a first longitudinal element L1 joins all the free ends of the term inal segments T2 to one another, a second longitudinal element L2 joins the median portions of the linear segments T2 to one another, a third longitudinal element L3 joins the meeting vertexes between the linear segments T2 and linear segments T3 to one another. A fourth longitudinal element L4 joins the meeting vertexes between the linear segments T3 and the linear segments T4 to one another. A fifth longitudinal element L5 joins all the vertexes V1 formed between the two linear segments T4 and T5 to one another.

[0097] A sixth longitudinal element L6 joins the meeting vertexes between the linear segments T5 and the linear segments T6 to one another.

[0098] A seventh longitudinal element L7 joins the meeting vertexes between the linear segments T6 and the linear segments T7 to one another.

[0099] And finally, an eighth longitudinal element L8 joins the all the free ends of the terminal segments T7 to one another.

[0100] In the installation, two base modules 24 are mounted so that the special screws S and the plates P join the longitudinal element L8 of the first module with the longitudinal element L1 of the second module to each other.

[0101] With this structure, the reflective film sheet F is inclined with respect to the plane of the terrain by an angle between 1 and 15 degrees.

[0102] As mentioned above, the modular structure 20 is built in a grid form using an automated metal electro-welding technique.

[0103] Structure 20 is sized so that the reflective film sheet F has a slope of at least 1 ° with respect to the plane of the terrain to facilitate self-cleaning of the reflective film F by means of flowing water.

[0104] Structure 20 is sized so as to allow the film of the reflective film F to reach the ground with the two sides to avoid the passage of wind below structure 20.

[0105] As mentioned above, structure 20 is easily mountable on, and connected to the ground by means of screws S.

[0106] Indicatively, we refer to photovoltaic modules of about 2 / 2.5 meters long, and singlespan structures for the sheet of 1 m in the case of a double span, 2m in the case of a single span. Basically, the preferred solution in terms of functionality is the one with a double-span profile 24 of Figure 10 because the slope is opposite to the one of the module with respect to the sun, and thereby the rays are better reflected. On the other hand, with solution 24, the installation is double because the span is double, not single. Therefore, it involves greater installation costs.

[0107] The modular structure 20 has base modules 22 or 24 of 3x1 meters up to 6x2 meters, or multiples thereof.

[0108] With reference to Figures 12, 16, a third, currently preferred, embodiment is described. A modular support structure 30 for a reflective film sheet F has a structure formed by a plurality of base modules 32.

[0109] Each base module 32 is formed by a first welded metal net 34 consisting of a series of parallel longitudinal profiles L with adequate spacing, and a series of transverse profiles TT with adequate spacing arranged to form a chessboard (see Figure 16).

[0110] The longitudinal profiles L and the transverse profiles TT are welded together to form the base module 32.

[0111] Each base module 32 is fixed to the ground using mounting elements 35 that cooperate with the longitudinal profiles L.

[0112] In particular, there is accommodated, above the aforesaid modular support structure 30, a second tight mesh metal net 40 with the terminal portions 42 of the longitudinal edges folded onto themselves.

[0113] Such a second tight mesh metal net 40 is formed by an arc welded or woven net consisting of thinner wires arranged to create a tighter weft serving to reduce the empty spaces on which the reflective film F rests and accordingly, to make it impossible for water to stagnate on the reflective film F.

[0114] The tight mesh net 40 is defined as a series of wires or round metal profiles having diameter between 0.1 and 7mm, preferably between 1 and 4mm. Alternatively, the tight mesh net 40 is defined as a series of wires or rectangular metal profiles having a side between 0.1 and 7mm, preferably between 1 and 4mm. In both cases, once welded, intertwined or woven, the wires create a net with empty spaces having regular shape, such as, for example, a rectangular, square, rhomboidal or hexagonal shape.

[0115] The regular-shaped empty spaces are adequately sized to avoid the stagnation of water on the reflective film F resting above the tight mesh net 40.

[0116] Indeed, the tight mesh net 40 serves to have a more punctual support with respect to the structure provided by the first welded metal net 34 and avoid the reflective film F from bending and causing water to accumulate.

[0117] The empty spaces within the tight mesh net 40 have an area between 0.5mm2and 0.25m2, preferably between 4cm2and 225cm2.

[0118] In greater detail, the reflective film F is fixed to the second metal net 40 with tighter mesh and the second tight mesh metal net 40 is in turn fixed to the base module 32 with fastening elements 50.

[0119] As in the preceding embodiments, each base module 32 is sized so that once mounted, the reflective film sheet F has a slope of at least 1 ° with respect to the plane of the ground so that the reflective film sheet F, resting on the tight mesh metal net 40, is inclined so as to facilitate the flowing of rainwater or water for cleaning the reflective film sheet F.

[0120] Figure 14 shows some types of configuration of the individual modules 32 forming the modular support structures 30, represented by the reflective film F mounted.

[0121] Each individual transverse profile TT of the arc welded metal net of a module 32 is folded into 3 transverse segments Ta, Tb and Tc, in which the central segment Tc is the longest and is connected at the two ends thereof to the segments Ta and Tb. The first end segment Ta is longer than the second end segment Tb and allows providing the central segment Tc with the right inclination with respect to the terrain.

[0122] In this embodiment, the second tight mesh metal net 40 with the longitudinal edges 42 folded is resting on the surface delimited by the central segments Tc and by at least three longitudinal elements L and leaves exposed the two end segments Ta and Tb.

[0123] In particular, the configurations (a)-(c) show two modules 32 coupled, while configuration (d) is made from a single module 32.

[0124] In the configuration of Figure 14(a), the two modules 32 are arranged so as to mirror a central axis AC, with the first end segments Ta arranged inwards and the second end segments Tb arranged outwards, i.e. , towards the central axis AC. In this case, there is one central drain channel, towards the inside of structure 30.

[0125] In the configuration of Figure 14(b), the two modules 32 are arranged correspondingly with the repetition of the module. In particular, both modules 32 will have the first end segments Ta arranged rightwards and the second end segments Tb arranged leftwards (or vice versa - configuration not shown). In this case, there are two drain channels at the second end segments Tb.

[0126] In the configuration of Figure 14(c), the two modules 32 are arranged so as to mirror a central axis AC, with the first end segments Ta arranged inwards, i.e., towards the central axis AC, and the second end segments Tb arranged outwards. In this case, there are two drain channels towards the outside of structure 30, in particular, at the second end segments Tb.

[0127] Figure 15 and Figure 16 show an exploded view of a module 32.

[0128] In particular, Figure 15(a) shows a reflective film sheet F with one or more holding elements F1 .

[0129] The holding elements F1 are polymeric clips shaped to form a thickness, preferably made of HDPE or LDPE, useful for locking film F within the structure of the second tight mesh metal net 40 to avoid the breaking or tearing of the film F itself.

[0130] The fastening elements 50 for fixing the second tight mesh metal net 40 to the first welded metal net 34, forming the base module 32, are, for example, pressure folded clips, or fastening elements consisting of two metal plates fixed with screwable elements to create pressure.

[0131] The same clip 50 may apply pressure on the folded part 42 of the structure of the second tight mesh metal net 40 for the purposes of immobilizing film F.

[0132] There are also metal elements 52 for the fixing to the outermost longitudinal elements L of the first welded metal net 34 for the purposes of coupling with the mounting elements 35. Such metal elements 52 are configured so that the individual module 32 may rotate and be raised for ground maintenance.

[0133] Finally, said mounting elements 35 are metal elements screwable into the ground, fixed to module 32 at the longitudinal profiles L.

[0134] Figure 17 shows a top view and Figure 18 shows a perspective view of two modules 32 mounted according to the configuration of Figure 14(b), with view from the opposite side of the drawing. Figure 19 and Figure 20 show how one of the two modules 32 may be raised to access the ground below.

[0135] The arrangement of the second tight mesh metal net 40 may be provided also in the preceding embodiments described with reference to Figures 1 -10.

[0136] With reference to the embodiments of Figures 2-10, the second tight mesh metal net 40 would be resting on the first welded metal net 22 or 24.

[0137] With the arrangement of such second tight mesh metal net 40, the mounting and fastening elements may also be modified as in the third embodiment, with respect to those described with reference to the first two embodiments.

[0138] The elements herein described by mere way of example may be modified in terms of size, but at this moment constitute the option the inventors deem best in terms of costs / performance and production and installation ease.

[0139] The description of specific embodiments provided above shows the invention from a conceptual point of view so that others, using the prior art, will be able to modify and / or adapt in various applications those specific embodiments without further research and without departing from the inventive concept, and, thus, it is understood that such adaptations and modifications will be considered as equivalents of the specific embodiments.

[0140] Means and materials for achieving the various functions described may be of various nature, without departing from the scope of the invention.

[0141] It is worth noting that terminology or expressions used are only descriptive and therefore non-limiting.

[0142] Obviously, without prejudice to the principle of the invention, the construction details and the embodiments can widely vary with respect to what is described and illustrated above by way of example, without however departing from the scope of the present invention.

[0143] Where the constructive features and techniques mentioned in the claims below are followed by references signs or numerals, such reference signs were introduced for the sole purpose of increasing the intelligibility of the claims themselves, and therefore, such reference signs have no limiting effect on the interpretation of each element identified, by way of example only, by such reference signs.

Claims

CLAIMS1 . A modular support structure (30) for a sheet of reflective film (F), having a structure (30) formed by a plurality of base modules (32), wherein each base module (32) is formed by a first metal net (34) consisting of a plurality of parallel and spacedapart longitudinal elements (L) connected to one another by a plurality of parallel and spaced-apart transverse elements (TT), wherein the transverse elements (TT) and the longitudinal elements (L) are metal profiles welded to one another to form a first welded metal net (34), wherein the transverse elements (TT) and the longitudinal elements (L) are arranged orthogonally to one another to form a chessboard with through openings (A), wherein each base module (32) is fixed to the ground using mounting elements (35) which cooperate with the longitudinal elements (L) of the first metal net (34), wherein each base module (32) is sized so that once the reflective film sheet (F) is mounted, it has a slope of at least 1 ° with respect to the plane of the ground and it remains inclined to facilitate the water flowing.

2. The modular support structure (30) for a reflective film sheet (F) according to claim 1 , wherein a second tight mesh metal net (40) is resting on said first welded metal net (34).

3. The modular support structure (30) for a reflective film sheet (F) according to claim 2, wherein said second tight mesh metal net (40) has folded longitudinal edges (42).

4. The modular support structure (30) for a reflective film sheet (F) according to claim 3, wherein said reflective film sheet (F) is inserted so as to be fixed to the second tight mesh metal net (40) at said folded longitudinal edges (42) by means of holding elements (F1 ).

5. The modular support structure (30) for a reflective film sheet (F) according to claim 4, wherein said second tight mesh metal net (40) is fixed to the first welded metal net (34) with fastening elements (50).

6. The modular support structure (30) according to one of the preceding claims, wherein each metal profile creating the transverse elements (T) and the longitudinal elements (L) of the first welded metal net (34) has a round section with a diameter between 2 and 15mm, preferably between 4 and 6mm, or a rectangular section with side dimensions between 2 and 15mm, preferably between 4 and 6mm.

7. The modular support structure (30) according to claim 6, wherein each profile is solid or empty with a tubular shape.

8. The modular support structure (30) according to any one of the preceding claims, wherein each base module (32) that creates the structure (30) is single-span and the base modules (32) are arranged in two or more parallel rows.

9. The modular support structure (30) according to any one of the preceding claims, wherein each single transverse segment (T) of a module (32) is folded so as to form three transverse segments (Ta, Tb e Tc), wherein a central segment (Tc) is the longest segment and is connected at the two ends thereof to two end segments (Ta, Tb), wherein the first tubular end segment (Ta) is longer than the second end segment (Tb) and allows providing the central segment (Tc) with the right inclination with respect to the ground.

10. The modular support structure (30) according to claim 9, wherein said second tight mesh metal net (40) with the folded longitudinal edges (42) is resting on the surface delimited by the central segments (Tc) and by at least three longitudinal elements (L) and leaves exposed the two end segments (Ta, Tb).

11. The modular support structure (30) according to claim 10, wherein the modular support structure (30) comprises two modules (32) that are arranged so as to mirror a central axis (AC), with the first end segments (Ta) arranged outwards and the second end segments (Tb) arranged inwards, i.e. , towards the central axis (AC).

12. The modular support structure (30) according to claim 10, wherein the modular support structure (30) comprises two modules (32) which are arranged correspondingly with the repetition of the module (32).

13. The modular support structure (30) according to claim 11 , wherein both modules (32) have the first end segments (Ta) arranged rightwards and the second end segments (Tb) arranged leftwards.

14. The modular support structure (30) according to claim 11 , wherein both modules (32) have the first end segments (Ta) arranged leftwards and the second end segments (Tb) arranged rightwards.

15. The modular support structure (30) according to claim 9, wherein the two modules (32) are arranged so as to mirror a central axis (AC), with the first end profile segments (Ta) arranged inwards, i.e., towards the central axis (AC), and the second end segments (Tb) arranged outwards.

16. The modular support structure (30) according to any one of the preceding claims, wherein the holding elements (F1 ) are polymeric clips shaped to form a thickness, preferably made of HDPE or LDPE, used to block the reflective film sheet (F) within the structure of the second tight metal net (40) to avoid the breaking or tearing of the film (F) itself.

17. The modular support structure (30) according to any one of the preceding claims, wherein the fastening elements (50) for fixing the second tight mesh metal net (40) to the first welded metal net (34) are pressure folded clips, or fastening elements consisting of two metal plates fixed with screwable elements to create pressure.

18. The modular support structure (30) according to any one of the preceding claims, wherein metal elements (52) for fixing are present on the outermost longitudinal elements (L) of the first welded metal net (34), adapted to be coupled with the mounting elements (35).

19. The modular support structure (30) according to claim 18, wherein the metal elements (52) are configured so that the single module (32) may rotate and be raised for ground maintenance.

20. The modular support structure (30) according to any one of the preceding claims, wherein the mounting elements (35) are metal elements screwable into the ground, fixed to the module 32 at the longitudinal profiles L.

21. The modular support structure (30) according to claim 8, wherein each base module (32) has a structure with a single-span side profile with an inverted V slope with the terminal ends folded.

22. The modular support structure (30) according to claim 8, wherein each base module (32) has a structure with inverted seagull wing-shaped side profile with the terminal ends folded.

23. The modular support structure (30) according to any one of the preceding claims, wherein said base modules (32) have dimensions between 3x1 meters and 6x2 meters or multiples thereof.

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