IT202100009623A1 - SOLAR TRACKING SYSTEM. - Google Patents

Description

Solar tracking system

The present invention relates to a solar tracking system.

Field of invention

Pi? in detail, the invention relates to a system of the aforementioned type, designed and manufactured in particular to convey the sun's rays towards one or more? solar panels such as, for example, photovoltaic or thermal solar panels, but what can? be used for any application where it is necessary to direct the sun's rays towards a device or a predetermined area.

In the following, the description will be? aimed at the use of photovoltaic solar panels but ? it is clear how the same should not be considered limited to this specific use.

Known technique

How?? Well known, solar panels are devices designed to recover energy from solar radiation and transform it, typically, into electricity. or heat.

In particular, there are currently various types of solar panels on the market, such as, for example, photovoltaic solar panels and thermal solar panels.

Photovoltaic solar panels are optoelectronic devices, made up of photovoltaic cells, capable of converting, through the photovoltaic effect, the sun's rays into electrical energy, intended for use, for example, inside a home. The thermal solar panels (called solar collectors in jargon), on the other hand, are devices capable of converting the sun's rays into thermal energy, which will be used, for example, to heat the water in a tank for domestic use or to assist the home's heating system.

Currently, in order to use the solar panels mentioned above ? it is necessary to have a surface exposed to sunlight such as, for example, the roof of a building, terrace or garden.

In particular, this surface must be suitable for hosting the photovoltaic system, i.e. it must have a sufficient size to accommodate a number of photovoltaic panels necessary for its energy needs.

Therefore, those who do not have such spaces do not have the possibility? to install and, therefore, use solar panels.

The known solutions provide solar tracking systems capable of orienting each solar panel according to the direction of radiation, ensuring the continuous incidence of the solar rays on each solar panel.

Therefore, these systems make it possible to change the inclination of each solar panel with respect to the solar rays incident on the same panel.

In particular, these solar tracking systems are divided into so-called "astronomical" systems, which are equipped with a memory with respect to the position of the Earth with respect to the Sun and systems equipped with sensors to measure the angle of incidence of the sun's rays with respect to the solar panels .

However, a drawback of these known solutions? given by the fact that they require surfaces directly exposed to solar radiation in order to guarantee the continuous incidence between the sun's rays and each solar panel and, therefore, the subsequent transformation of solar energy into electrical and/or thermal energy.

Another drawback of these known solutions? given by the fact that the space in which the solar panels are to be installed must be free from shading, determined, for example, by trees, other buildings or by antennas positioned near the solar panels. In fact, the presence of a shadow on a single photovoltaic module can cause the decrease in productivity? of the entire photovoltaic system.

Another drawback of these known solutions? given by the fact that the solar tracking systems are complex in terms of structure as well as? expensive in terms of costs.

Purpose of the invention

In the light of the above, it is, therefore, the object of the present invention to overcome the above mentioned drawbacks by providing a solar tracking system for conveying the solar rays onto a photovoltaic solar panel positioned in an area not exposed to solar radiation such as, for example , a shaded area.

Another purpose of the invention? that of providing a solar tracking system which is highly reliable, relatively simple to make, and at competitive costs when compared to the prior art.

Object of the invention

Therefore, a specific object of the present invention is a solar tracking system for conveying solar rays onto a first wall of a building not exposed to said solar rays, in which said system comprises at least one solar energy conversion device, which can be positioned on said first wall, comprising an active surface for receiving said solar rays and converting them into electrical energy, and a perimeter zone arranged around said active surface, detection means capable of generating a presence signal when said solar rays strike said perimeter zone, at least one reflective device , positionable on a second wall of said building exposed to said solar rays, at least one movement group of said reflecting device, a unit? control logic, operatively connected to said detection means and to said at least one movement unit and configured to receive from said detection means said signal of the presence of said solar rays on said perimeter area, so to actuate said at least one movement unit to orient said at least one reflecting device to convey said solar rays inside said active surface.

Advantageously according to the invention, said detection means can comprise first detection means, arranged on a first portion of said perimeter area to detect the presence of said solar rays on said first portion, second detection means, arranged on a second portion of said perimeter area to detect the presence of said solar rays on said second portion, and said at least one movement group can? being capable of rotating said at least one reflecting device about a first axis X substantially parallel to said first and second portions of said perimeter zone.

Still according to the invention, said first portion of said perimeter area can be arranged facing said second portion of said perimeter area, and, when said unit? control logic receives from said second detection means or said first detection means a signal of the presence of said solar rays on said second portion or said first portion, said unit? control logic activates the rotation of said at least one reflecting device around said first axis X respectively according to a first direction of rotation or a second direction of rotation, opposite to said first direction of rotation, so as to respectively reflect said solar rays towards said first detection means or said second detection means.

Still according to the invention, said detection means comprise third detection means, arranged on a third portion of said perimeter area to detect the presence of said solar rays on said third portion, fourth detection means, arranged on a fourth portion of said perimeter area to detect the presence of said solar rays on said fourth portion, and said third portion of said perimeter area can? be arranged facing said fourth portion of said perimeter area.

Conveniently according to the invention, said at least one handling group can be capable of rotating said at least one reflecting device about a second axis Y, perpendicular to said first axis X, and said unit? control logic can? be operationally connected to said third and fourth detection means and ? configured to receive from said third and fourth detection means a signal of the presence of said solar rays on said perimeter area, and to rotate said at least one reflecting device around said second axis Y in such a way as to direct said solar rays inside this active zone.

Still according to the invention, when said unit? control logic receives from said fourth detection means or said third detection means a respective signal of the presence of said solar rays on said fourth portion or said third portion, said unit? control logic activates the rotation of said at least one reflecting device around said second axis Y respectively according to a first direction of rotation or a second direction of rotation, opposite to said first direction of rotation, so as to respectively reflect said solar rays towards said third detection means or said fourth detection means.

Still according to the invention, said at least one handling group can comprising at least a first movement member for moving said at least one reflecting device around said first axis X according to said first direction of rotation or said second direction of rotation, and at least a second movement member for moving said at least one reflecting device around said second axis Y according to said first direction of rotation or said second direction of rotation.

Advantageously according to the invention, said at least one reflecting device comprises a first reflecting device, which can be positioned on a first portion of said building not exposed to said solar rays, comprising detection means for detecting the presence of said solar rays, and a second reflecting device , which can be positioned on a second portion of said building exposed to said solar rays, said at least one movement unit can? comprising a first movement assembly connected to said first reflecting device for rotating said first reflecting device about said first axis X or said second Y axis, and a second movement assembly connected to said second reflecting device for rotating said second reflecting device about said first axis X or said second axis Y, in which said unit? control logic, operatively connected to said detection means of said first reflecting device and to said at least one movement unit and configured to receive from said detection means of said first reflecting device a signal of the presence of said solar rays on said first reflecting device and to rotate said first reflecting device about said first X axis or said second Y axis in such a way as to convey said solar rays inside said active surface.

Still according to the invention, said detection means can be brightness sensors.

Still according to the invention, said at least one reflecting device can be connectable, by means of a respective support member to said building, and each handling member (13A, 13B, 13A?, 13B?) can? be an engine.

Brief description of the figures

This invention will come now described for illustrative but not limiting purposes, according to its preferred embodiments, with particular reference to the figures of the attached drawings, in which: figure 1 shows a perspective view of an embodiment of a solar tracking system, according to the present invention;

figure 2 shows a top view of a solar panel included in the system of figure 1;

figure 3 shows, in side view, the solar tracking system of figure 1; And

figure 4 shows a side view of a further embodiment of the solar tracking system of figure 1.

In the various figures, similar parts will be indicated with the same reference numbers.

Detailed description

With reference to figures 1 and 3, ? shown is a solar tracking system according to the present invention, indicated as a whole with the reference number 1, which comprises a solar energy conversion device 10 positioned on a building E, a reflecting device 11 capable of receiving solar rays R coming from a solar source S and reflecting them onto said solar energy conversion device 10, a support member 12 connected to support said reflecting device 11 and a unit? control logic U operatively connected to said solar energy conversion device 10 and to said reflecting device 11.

The solar energy conversion device 10 ? capable of converting light energy, whether natural or artificial, into electrical and/or thermal energy.

In the embodiment being described, said light energy conversion device 10 ? a photovoltaic solar panel to convert solar energy into electrical and/or thermal energy.

However, in other embodiments, the number and type of said solar energy conversion device 10 may be different from what is described. For example, the solar energy conversion device 10 can be a different optoelectronic device, a thermal solar panel or a thermodynamic solar panel.

In particular, as can be seen from Figure 1, said solar energy conversion device 10? fixed to a first wall E1 of the building E, in which said first wall E1 is not? exposed to solar radiation, or ? in a shaded area.

Pi? in detail, said first wall E1 extends along a perpendicular or substantially perpendicular direction to a second wall E2 of said building E.

In the present embodiment, said first wall E1 ? the lower wall of a terrace or balcony on a given floor of building E.

However, the arrangement of said solar energy conversion device 10 can be different from what is described without thereby departing from the scope of protection of the present invention. By way of example, said solar energy conversion device 10 can be positioned inside said building E such as, for example, fixed to the ceiling of a room on one floor of said building E.

With particular reference to figure 2, said solar energy conversion device 10 comprises a first zone or active surface 100 and a second zone or perimeter zone 101, which ? arranged around said active surface 100.

In particular, the active surface 100 comprises a plurality of photovoltaic modules (not shown in the figures), which are in turn equipped with photovoltaic or solar cells (not shown in the figures) to receive the solar rays R and convert, by means of the photovoltaic effect, the solar energy of these solar rays R into electricity.

In the embodiment described, the active surface 100 has a substantially square shape. However, the shape of said active surface 100 can be different without thereby departing from the scope of protection of the present invention.

The second area 101, on the other hand, surrounds, as mentioned, the active surface 100.

In the present embodiment, the solar energy conversion device 10 has a rectangular section. However, in other embodiments of the present invention, the section of said solar energy conversion device 10 may be different than described.

In particular, said perimeter area 101 comprises four portions or sides 101A, 101B, 101C, 101D, in which said first portion 101A ? opposite said second portion 101B and said third portion 101C ? opposite to said fourth portion 101D.

Furthermore, as can be seen from figures 1 and 2, said system 1 comprises detection means S1, S2, S3, S4 for detecting the presence of said solar rays R, as will be better described later.

In the embodiment described, said detection means S1, S2, S3, S4 are arranged respectively on said portions 101A, 101B, 101C, 101D of said perimeter area 101.

In particular, said first detection means S1 are arranged on said perimeter area 101, at a midpoint of said first portion 101A, while said second detection means S2 are arranged on said perimeter area 101, at a midpoint of said second portion 101B.

Similarly, said third detection means S3 are arranged on said perimetric area 101, at a midpoint of said third portion 101C, and said fourth detection means S4 are arranged on said perimetric area 101, at a midpoint of said fourth portion 101D.

However, in other embodiments, the number and position of said detection means S1, S2, S3, S4 may be different. For example, system 1 can? include one or more detection means arranged along said perimeter area 101 or one or more? detection means arranged externally to said solar energy conversion device 10.

In another embodiment of the present invention, said detection means S1, S2, S3, S4 are arranged on a perimetric area of a reflecting device positioned on the ceiling of a room of the building E, in which said reflecting device ? aimed at the area of the room you wish to illuminate. In this case, the solar tracking system 1 makes it possible to illuminate one or more? internal environments of said building E, replacing, for example, the artificial light during the day, with a considerable saving of electricity.

Furthermore, as mentioned, each of said detection means S1, S2, S3, S4, connected to said unit? control logic U, ? configured to detect the presence/absence of solar rays R coming from said light source S on the respective portion 101A, 101B, 101C, 101.

Each of said detection means S1, S2, S3, S4 ? further configured to transmit a respective signal of presence/absence of said solar rays R to said unit? U control logic.

In the embodiment described, said detection means S1, S2, S3, S4 are brightness sensors? such as, for example, photodetectors or photodiodes.

However, in other embodiments of the present invention, the typology of said detection means S1, S2, S3, S4 can be different than described.

The reflecting device 11, as mentioned, is capable of receiving the solar rays R and reflecting them onto said solar energy conversion device 10.

As can be seen from figure 1, said reflecting device 11 such as, for example, a mirror,? arranged below said solar energy conversion device 10.

In particular, said reflecting device 11 ? connected, by means of said support member 12, such as a bracket 12 and the like, to said second wall E2 of said building E.

In the embodiment described, said reflecting device 11? capable of rotating around a first axis X of a Cartesian reference system XYZ according to a first direction of rotation D1 or a second direction of rotation D1?, opposite to said first direction of rotation D1, so as to respectively reflect the solar rays R towards said first detection means S1 or said second detection means S2 of said solar energy conversion device 10.

Analogously to what has been said, the reflecting device 11 is capable of rotating around said second axis Y, perpendicular to said first axis X, according to a first direction of rotation D2 or a second direction of rotation D2?, opposite to said first direction of rotation D2, so as to respectively reflect the sun's rays R towards said third detection means S3 or said fourth detection means S4 of said solar energy conversion device 10.

In other embodiments of the present invention, said reflective device 11? able to rotate around a third Z axis, perpendicular to said first X axis and to said second Y axis, according to at least one direction of rotation (not shown in the figures).

Furthermore, in other embodiments of the present invention, said system 1 comprises one or more? further reflecting devices arranged on said solar energy conversion device 10 in such a way as to receive the solar rays R from said reflecting device 11 and convey them onto said detection means S1, S2, S3 and S4.

The solar tracking system 1 also comprises a movement group 13 for moving said reflecting device 11 around said first axis X and said second axis Y.

In particular, said handling group 13 ? connected to said support member 12 and to said reflecting device 11.

Pi? in detail, said movement unit 13 comprises a first movement member 13A for moving said reflecting device 11 around said first axis X and a second movement member 13B for moving said reflecting device 11 around said second axis Y.

In the embodiment being described, each movement member 13A, 13B is a motor able to rotate said reflecting device 11 around the respective axis of rotation X, Y.

However, the number and arrangement of said movement members 13A, 13B may be different from what is described without thereby departing from the scope of protection of the present invention.

The unit control logic U ? connected to said detection means S1, S2, S3, S4 by means of a communication network such as, for example, a communication network Bluetooth?. However, in other embodiments, the unit? control logic U pu? be connected to said detection means S1, S2, S3, S4 by means of further connection means such as, for example, cables and the like.

Furthermore, this unit control logic U ? operatively connected to said movement members 13A, 13B. In one embodiment of the present invention, the unit? control logic U ? connected to said movement members 13A, 13B by connection means such as, for example, electric cables and the like.

Pi? in detail, said unit? control logic U ? programmed and configured to receive from said detection means S1, S2, S3, S4 respective signals of presence/absence of solar rays R.

In addition, this unit? control logic U ? configured to activate/deactivate said movement members 13A, 13B in order to rotate said reflecting device 11 around said first axis X or said second axis Y.

In fact, said reflecting device 11 can be rotated by sending a respective command signal from said unit? control logic U to said movement members 13A, 13B.

The solar tracking system 1 described above operates as follows.

Initially, the solar energy conversion device 10 is positioned on the first wall E1 of said building E while the reflecting device 11 is positioned, by means of said support member 12, on the second wall E2 of said building E.

When the reflecting device 11 reflects the solar rays R within the area defined by the perimeter zone 101 of said solar energy conversion device 10, or within said active zone 100, said detection means S1, S2, S3 , S4 are not affected by solar radiation R and, therefore, are not activated.

In particular, when said detection means S1, S2, S3, S4 are inactive, they send respective signals of absence of solar rays R to said unit? U control logic.

On the other hand, when the solar rays R change direction, and are directed by said reflecting device 11 outside said active area 100 of said solar energy conversion device 10, or on said perimeter area 101, said detection means S1, S2, S3, S4 are activated.

In particular, said detection means S1, S2, S3, S4 send respective signals of the presence of solar rays R to said unit? control logic U, which, in turn, actuates said movement members 13A, 13B to move said reflecting device 11 around said first axis X and/or said second axis Y.

Pi? in detail, when said solar rays R reflected by the reflecting device 11 strike the first portion 101A of said perimeter area 101, the first detection means S1 send a respective signal of the presence of solar rays R to said unit? control logic U, which, in turn, activates said first movement member 13A to rotate said reflecting device 11 around said first axis X according to said second direction of rotation D1?, ie towards said second detection means S2.

On the other hand, when said solar rays R reflected by the reflecting device 11 strike the second portion 101B of said perimeter area 101, the second detection means S2 send a respective signal of the presence of solar rays R to said unit. control logic U, which, in turn, activates said first movement member 13A to rotate said reflecting device 11 around said first axis X according to said first direction of rotation D1, ie towards said first detection means S1.

Similarly, when said solar rays R reflected by the reflecting device 11 strike the third portion 101C of said perimeter area 101, the second detection means S2 send a respective signal of presence of solar rays R to said unit? control logic U, which, in turn, activates said second movement member 13B to rotate said reflecting device 11 around said second axis Y according to said second direction of rotation D2?, ie towards said fourth detection means S4.

On the other hand, when said solar rays R reflected by the reflecting device 11 strike the fourth portion 101D of said perimeter area 101, the fourth detection means S4 send a respective signal of the presence of solar rays R to said unit? control logic U, which, in turn, activates said second movement member 13B to rotate said reflecting device 11 around said second axis Y according to said first direction of rotation D2, ie towards said third detection means S3.

There? it allows to maintain, in use, the solar rays R within the active zone 100 of said solar energy conversion device 10.

With particular reference to figure 4, a further embodiment of the solar tracking system 1 according to the present invention can be observed, in which there are two reflecting devices 11, 11? arranged facing each other.

The first reflective device 11 ? arranged below said solar energy conversion device 10 in an area of said building E not exposed to solar radiation R. In particular, said first reflecting device 11 ? equipped with detection means (not shown in the figures) arranged on the respective sides of said first reflecting device 11 to detect solar radiation R.

The second reflective device 11? is, on the other hand, arranged in an area of said building E exposed to solar radiation R. In particular, as can be seen from figure 4, second reflecting device 11? ? arranged facing said first reflecting device 11 and connected, by means of said support member 12?, like a bracket 12? and the like, to said building E.

In particular, the solar rays R incident on the second reflecting device 112 are reflected by the latter onto the first reflecting device 11, which, in turn, reflects said solar rays R towards said solar energy conversion device 10.

Analogously to what has been described for the first embodiment, when the solar rays R, reflected by said second reflecting device 112, come out from the edge of said first reflecting device 11, said solar rays R strike one of said detection means. Then, said detection means send a respective signal of the presence of solar rays R to said unit? control logic U which activates the respective handling member 13A? 13B? of said movement group 13? to rotate said first reflecting device 11 and/or said second reflecting device 11?.

Are the structure and function of the further components of the solar tracking system 1 the same for what? which relates to the first embodiment of the present invention described above.

Advantages

A first advantage of the system for directing the sun's rays onto a solar panel according to the present invention ? that of conveying the sun's rays towards the solar panel positioned in an area not exposed to solar radiation such as, for example, a shaded area. In this way, even the solar panels placed, for example, on the ceiling of a balcony will be able to capture solar energy.

A further advantage of the system for directing the sun's rays onto a solar panel according to the present invention ? to provide for the use of a plurality? of reflective devices in case it was problematic to project the sun's rays onto the photovoltaic panel using a single reflective device.

The present invention ? been described by way of illustration, but not limitation, according to your preferred embodiments, but ? it should be understood that variations and/or modifications may be made by experts in the art without thereby departing from the relative scope of protection, as defined by the attached claims.

Claims (10)

1. Solar tracking system (1) for conveying solar rays (R) onto a first wall (E1) of a building (E) not exposed to said solar rays (R), wherein said system (1) comprises at least one solar energy conversion device (10), which can be positioned on said first wall (E1), comprising an active surface (100) for receiving said solar rays (E) and converting them into electric energy, ed a perimeter area (101) arranged around said active surface (100), detection means (S1, S2, S3, S4) capable of generating a presence signal when said solar rays (R) hit said perimeter area (101), at least one reflecting device (11, 11?), which can be positioned on a second wall (E2) of said building (E) exposed to said solar rays (R), at least one movement group (13, 13?) of said reflecting device (11, 11?), a?unit? control logic (U), operatively connected to said detection means (S1, S2, S3, S4) and to said at least one handling unit (13, 13?) and configured to receive from said detection means (S1, S2, S3, S4) said presence signal of said solar rays (R) on said perimetric area (101), so? to operate said at least one movement unit (13, 13?) to orient said at least one reflecting device (11, 11?) to convey said solar rays (R) inside said active surface (100). 2. System (1) according to the preceding claim, characterized by the fact that said detection means (S1, S2, S3, S4) comprise first detection means (S1), arranged on a first portion (101A) of said perimeter area (101) to detect the presence of said solar rays (R) on said first portion (101A), second detection means (S2), arranged on a second portion (101B) of said perimeter area (101) to detect the presence of said solar rays (R) on said second portion (101B), and by the fact that said at least one group of handling (13, 13?) ? capable of rotating said at least one reflecting device (11, 11?) around a first axis X substantially parallel to said first (101A) and second (101B) portions of said perimeter zone (101). 3. System (1) according to the preceding claim, characterized by the fact that said first portion (101A) of said perimeter area (101) ? arranged facing said second portion (101B) of said perimeter area (101), e by the fact that, when said unit? control logic (U) receives from said second detection means (S2) or said first detection means (S1) a signal of the presence of said solar rays (R) on said second portion (101B) or said first portion (101A) , said unit? control logic (U) activates the rotation of said at least one reflecting device (11, 11?) around said first axis X respectively according to a first direction of rotation (D1) or a second direction of rotation (D1?), opposite to said first direction of rotation (D1), so as to reflect respectively said solar rays (R) towards said first detection means (S1) or said second detection means (S2). 4. System (1) according to any one of the preceding claims, characterized by the fact that said detection means (S1, S2, S3, S4) comprise third detection means (S3), arranged on a third portion (101C) of said perimeter area (101) to detect the presence of said solar rays (R) on said third portion (101C), fourth detection means (S4), arranged on a fourth portion (101B) of said perimeter area (101) to detect the presence of said solar rays (R) on said fourth portion (101D), and by the fact that said third portion (101C) of said perimeter area (101) ? arranged facing said fourth portion (101D) of said perimeter area (101). 5. System (1) according to the preceding claim, characterized by the fact that said at least one handling group (13, 13?) ? capable of rotating said at least one reflecting device (11, 11?) around a second axis Y, perpendicular to said first axis X, and by the fact that this unit? control logic (U) ? operationally connected to said third (S3) and fourth (S4) detection means and ? configured to receive from said third (S3) and fourth (S4) detection means a signal of the presence of said solar rays (R) on said perimeter area (101), and to rotate said at least one reflecting device (11, 11?) around said second axis Y in such a way as to direct said solar rays (R) within said active zone (100). 6. System (1) according to any one of claims 4 or 5, characterized in that, when said unit? control logic (U) receives from said fourth detection means (S4) or said third detection means (S3) a respective signal of the presence of said solar rays (R) on said fourth portion (101D) or said third portion (101C ), said unit? control logic (U) activates the rotation of said at least one reflecting device (11, 11?) around said second axis Y respectively according to a first direction of rotation (D2) or a second direction of rotation (D2?), opposite to said first direction of rotation (D2), so as to respectively reflect said solar rays (R) towards said third detection means (S3) or said fourth detection means (S4). 7. System (1) according to the preceding claim, characterized in that said at least one handling group (13, 13?) comprises at least one first movement member (13A, 13A?) for moving said at least one reflecting device (11, 11?) around said first axis X according to said first direction of rotation (D1) or said second direction of rotation (D1?), and at least one second movement member (13B, 13B?) for moving said at least one reflecting device (11, 11?) around said second axis Y according to said first direction of rotation (D2) or said second direction of rotation (D2?). 8. System (1) according to any one of the preceding claims, characterized by the fact that said at least one reflecting device (11, 11?) comprises a first reflecting device (11), which can be positioned on a first portion of said building (E) not exposed to said solar rays (R), comprising detection means for detecting the presence of said solar rays (R), and a second reflecting device (11?), which can be positioned on a second portion of said building (E) exposed to said solar rays (R), since said at least one movement group (13, 13?) comprises a first movement unit (13) connected to said first reflecting device (11) for rotating said first reflecting device (11) about said first X axis or said second Y axis, and a second movement unit (13?) connected to said second reflecting device (11?) to rotate said second reflecting device (11?) around said first X axis or said second Y axis, in which said unit? control logic (U), operatively connected to said detection means of said first reflecting device (11) and to said at least one movement group (13, 13?) and configured to receive from said detection means of said first reflecting device ( 11) a signal of the presence of said solar rays (R) on said first reflecting device (11), and for rotating said first reflecting device (11) around said first X axis or said second Y axis in such a way as to convey said rays solar panels (R) within said active surface (100). 9. System (1) according to any one of the preceding claims, characterized in that said detection means (S1, S2, S3, S4) are brightness sensors. 10. System (1) according to any one of the preceding claims, characterized by the fact that said at least one reflecting device (11, 11?) ? connectable, by means of a respective support member (12, 12?) to said building (E), e by the fact that each movement member (13A, 13B, 13A?, 13B?) ? an engine.