WO2020165471A1

WO2020165471A1 - Fixed-focus solar collector with receiver modules

Info

Publication number: WO2020165471A1
Application number: PCT/ES2020/000010
Authority: WO
Inventors: Blai LLISTERRI FERNÁNDEZ
Original assignee: LLISTERRI FERNÁNDEZ, Isabel; PIZARRO CANO, Mireia
Priority date: 2019-02-12
Filing date: 2020-02-10
Publication date: 2020-08-20
Also published as: ES2779173B2; ES2779173A1

Abstract

The invention relates to a fixed-focus solar collector with receiver modules, describing a parabolic, oval collector that is 45-150 cm in size, for the capture and subsequent use of solar energy by means of receiver modules, which is characterised in that it is biaxial, towable and has a support structure, a movable altitude arm, a parabolic module and receiver modules. The structure supports a tank of fluid, a control desk and the receiver modules. The altitude arm is motorised and actuated by a telescopic cylinder. An azimuth arm, which is also motorised, supports an off-centre parabolic screen, a solar panel, a tracker and a counterweight. The incident rays are continuously and automatically directed onto the focus, coinciding with the intersection of the altitude axis and the azimuth axis. The parabolic screen is coated using a chrome effect or sheets of aluminium, silver or similar. The receiver modules are heat-resistant glass flasks or metal heaters.

Description

DESCRIPTION

SOLAR COLLECTOR WITH FIXED FOCUS WITH RECEIVER MODULES

TECHNICAL OBJECT OF THE INVENTION

The present invention refers to a high-performance solar collector that captures the sun's rays by means of a parabolic screen known as "off-center" with a reflective surface of the sun's rays that concentrates them at a point close to the parabolic receiver while maintaining said approach constantly as the device is complemented with a highly accurate solar tracker. The collector of the invention is of the two-axle type, being mounted on a tubular structure equipped with wheels for its transfer to the most convenient place, either manually or as a trailer.

The invention includes receiver modules specially designed to optimally capture the heat energy from the sun, being able to be used for cooking or heating different products, edible or not, and also for various other purposes that will be discussed in this document.

SECTOR OF THE TECHNIQUE TO WHICH THE INVENTION REFERS

The invention falls within the Mechanics, Lighting, Heating Section of the International Patent Classification, Lighting Section, Heat, Heating Paragraph, Ventilation Stoves

From the industrial point of view, it affects the design and manufacture of devices and accessories for solar energy collection with medium-sized mobile devices.

BACKGROUND OF THE INVENTION

The parabolic antennas have multiple applications in the capture of energy. Its operation is based on the property of the parabola, either as a geometric line or as a surface of revolution generated by a parabola that rotates on its main axis. This property consists of any ray of light or electromagnetic energy that falls on the parabola according to the direction of said axis. it reflects off the concave surface and takes a new direction that systematically passes through a point called the focus. This means that if the axis of incidence on the parabola is oriented towards the sun, the energy receives, it will concentrate on the bulb and if you place an element at that point, it will heat up very quickly and efficiently, reaching very high temperatures.

The indicated property can also be used in the opposite direction, that is, if we place an energy emitter of any type at the focal point, the corresponding radiations, after being reflected on the parabolic surface, are redirected parallel to the axis of incidence.

Due to the above, parabolic antennas can be used as transmitting antennas or as receiving antennas.In transmitting parabolic antennas, the screen reflects the electromagnetic wave generated by a radiating device that is located in the focus and the wave fronts that it generates come out of this reflector in a more coherent way than in other types of antennas, while in receiving antennas, the parabolic screen concentrates the incident wave in its focus where a sensor is located.Normally these antennas in microwave networks operate according to the system called duplex, that is, , transmit and receive simultaneously, being very suitable to be used at high frequencies where high gains are achieved.

For this reason, the use of satellite dishes is common in the following applications:

. Communications satellites

. Radar for military or meteorological use

. Satellite television receivers

. Radioeniaces

. Ham radio stations

. Space probes

. Space probe tracking stations

. Radio telescopes

. Doppler sonar for wind measurements

These are basic applications for electromagnetic waves, and there is also another series of applications for the capture of solar energy, especially the one known as direct radiation that reaches us from the solar focus without reflections or intermediate refractions. Today this energy capture is promoted by all Administrations as it is a modality known as renewable Spain, whose geographical and climatic characteristics are especially favorable for the capture of solar rays registers a continuous process of development in this type of facilities. But there is also an important development around the world as evidenced by the large number of known antecedents of which we will cite some, by way of example, but emphasizing that there are many more.

- ES-1042691 U Solar energy collector device

- ES-1066800 U Mechanical solar tracker

- ES-1068804 U Solar tracker on support pulley (two axes)

- ES-1071346 U Solar tracker for solar collectors (two axes)

- ES-1071347 U Solar tracker on lattice for solar collectors (two axes)

- ES-1074127 U Thermal solar collector (two axes)

- ES-23041 1 3 Al Two-axis circular solar tracker

- ES-23321 17 A1 Solar monitoring system for solar energy collectors

- ES-2345078 A1 Structure for solar tracker and installation procedure

- ES-2398078 B2 Device for capturing concentrated solar radiation

- ES-2428616 T3 Solar collector

- ES-2649141 T3 Refraction concentration solar tracker (two axes)

It is observed that the inventions focus on the one hand on solar radiation collectors and on the other on solar trackers.

However, the inventor does not know of any antecedent in which it is a question of parabolic collectors governed by high precision trackers, complemented with specific receiver modules, such as the one described here, with the particularity that it was brought from a medium-sized device , move it on wheels and tow it, using collector screens of the "off-center" type, with the property of keeping the energy concentration in a fixed focus thanks to the arrangement of its axes and follower mechanism. Its configuration is represented and described in the sections following of this document, considering the author that, in addition to the possibility of its application industrial, the idea meets the characteristics of novelty and inventive activity required in these cases. SWEDISH DESCRIPTION OF THE INVENTION

The present invention, as has been explained in the introduction, refers to a solar collector with a fixed focus in space and high performance, with a parabolic screen collector, medium size, oval in shape, the largest dimension of which can range from 45 to 150 centimeters, move it on wheels and tow it by any vehicle, with multiple uses, thanks to its special receptor modules, such as food cooking, baking, water heating, polabilization, sterilization, energy storage and other purposes.

The device of the invention is composed of three main parts, corresponding to the solar collector

Support structure

Movable arm

Parabolic screen module

All this complemented with special receiver modules for the use of the energy received.

The support structure is a tubular frame, equipped with wheels and towing hitch, where all the components of the device sit. Its upper part supports the receiver module, chosen in each case, matching the bulb it has with the focus of convergence of the solar rays reflected by the parabolic screen that is treated with mirror coating On the front, more accessible , there is the control desk for the initial configuration and necessary adjustments

The mobile arm constitutes, in turn. the support of the parabolic screen module with the particularity that it rotates on the main structure around a horizontal axis. It consists of a part in the shape of an “LT, at the upper ends of which are placed the joints that define the horizontal axis. In its lower part a single curved bar begins that extends to the front part of the general structure where the screen module sits. parabolic In the front third of this rod of the movable arm there is a joint that receives ei thrust of the telescopic device that allows regulating, in a motorized way, what we will call the height angle.

Finally, the module of the parabolic screen is the one that includes the screen itself. the motor for its drive, a solar panel that, complemented by a battery of accumulators, has enough power to power all the actuators of the device, the sensor capsule and the balancing counterweight.

All these elements allow an automatic operation of the collector with monitoring of sunlight for a very efficient use of the energy received, which, through the use of specific receiver modules, is applied to the heating of products of all kinds, electrical applications and even to the accumulation of energy for use at night times when the sun is not shining. Explanatory figures of the device and a description of the preferred embodiment by its inventor are included in the following sections.

BRIEF DESCRIPTION OF THE DRAWINGS

Eight schematic figures are included to facilitate understanding of the invention without exhausting other solutions that involve small variations of the original idea.

Figure 1

It shows a perspective view of the solar collector of the invention, the following elements having been indicated:

1 - Solar collector

2.- Support structure

3 - Crossbar

4 - Wheel

5 - Leg

6.- Plug

7.- Flask-type receiver module

8.- Control desk

9.- Fluid tank

10 - Fluid conduit

1 1 Mobile height arm 12 - Height axis

13.- Cartouche

14.- Parabolic screen

15.- Mobile azimuth arm

15.- Azimuth motor group

17 - Parabolic support

18 - Solar panel

19.- Sensor capsule

20.- Counterweight

21. - Azimuth axis

22 - Focus

23 - Height motor group

24 - Telescopic height

Fsgure 2

It shows a side view of the solar collector pointing out the same elements of the previous figure.

25.- Angle "to"

28 .. Solar rays

Figure 3

It shows the same front side view of the solar collector in which the height mobile arm has been acted upon with the consequent impact on all the components with a rotation around the height axis. Angle "a" has decreased

Here the solar collector is shown in front and side views in a position in which the azimuth motor group has moved the azimuth mobile arm with the parabolic screen and other associated elements, causing a rotation of an angle close to 90 degrees on the azimuth axis.

27.- Angle "b"

Figure 6

Represents the detail of the flask-type receiver module and that has been shown in * Figs. 1 and 2). 28 .-- Cover

29.- Mesh

30.- Flange and fastening means

Figures 7 and 8

These figures show the side view (Fig. 7) and the top view (Fig 8) of the heating receiver module.

31.- Heater type receiver module

32.- Diffuser

32.1.- Pick-up bulb

33.- Insulating coating

34.- Transparent dome DETAILED EXPLANATION OF A WAY OF REALIZATION OF. THE

INVENTION

Fixed focus solar collector with receiver modules (1) (Figs. 1 to 8) that describes a high-performance collector, with a parabolic screen collector, with a diameter between 45 and 150 centimeters, moved on wheels and towed with, at least , a flask type receiver module and a heating receiver module, for multiple applications such as heating or cooking food, fluid heating, purification, sterilization, transformation and accumulation of energy and other similar purposes. In a preferred embodiment of its inventor, the solar collector (1) comprises, as main elements, a support structure (2), a height mobile arm (1 1) and the parabolic screen module (Fig. 1 ) that are complemented by receiver modules where the received solar energy is concentrated

The support structure (2) is tubular with two curved bars in the shape of a "C" that are joined together, forming a single body, by means of several transverse bars (3). In the lower part, it has a pair of wheels (4), pneumatic and two legs (5), which guarantee a good seat on the ground in the working position and allow an easy movement of the set in manual movements or in trailer mode, by any vehicle, when, with a slight incline to raise the legs (5), it is supported only on the wheels (4). A tow bar is available (not shown).

The upper part of the support structure (2) also serves to support the different receiver modules since, in its front part, it is where the focus (22) is located, a fixed point in space, where the solar rays converge (26) reflected by the parabolic screen of the solar collector (1) of the invention. This is reflected in (Fig. 1) where, for clarity, the installation of the flask-type receiver module (7) has been represented, and it can be seen that the geometric center of the spherical surface of the flask is located precisely at the focus (22) , where the two main axes of the solar collector (1) intersect, which are the height axis (12) and the azimuth axis (21).

At half height, in a place that is comfortable and accessible, the control desk (8) is located from where the different parameters of the device and other usual details are initially configured for the correct adjustment of these devices. In the lower position of the control desk (8), a fluid reservoir (9) is located, supported on the support structure (2), the tubes of which house the fluid conduits (10) that, reaching the The upper part of said tubes are connected, when necessary, to the aforementioned flask-type receiver module (7), positioned in the focus (22), in order to have hot fluid with circulation activated by a minipump (not shown).

In the mobile height arm (11) two characteristic sections are distinguished; an upper one in the shape of a "U" and a lower one, arched that starts at the lowest part of the "U" and extends forward to the front of the device. This height mobile arm (1 1) is related to the support structure (2) by means of the height axis (12), which is articulated at the upper edge of said structure. The rotational movements about the height axis (12) are achieved by the action of the group height motor (23), which drives the height telescopic cylinder (24), one end of which is attached to one of the transverse bars (3), close to the wheel axis and the other end to the bracket (13) , secured to the height mobile arm (1 1), in the front third of said arm. The position of this arm is defined by the angle “a” (25), as can be seen in ias (Figs. 2 and 3 ). As for the module of the parabolic screen, another of the fundamental parts of the device of the invention, it is composed of an oval parabolic screen (14) that, depending on the models, has its largest dimension between 45 and 150 centimeters and with the main characteristic of being a parabolic screen of the so-called “off-center” since it is built and installed in such a way that the focus (22) of concentration of the solar rays (26), reflected, is located, in the space at the crossroads of the axis height (12) with the azimuth axis (21) (Fig. 1). Its active, reflective part is technically treated with the projection of one or more layers of chrome effect, although it can also be those covered with aluminum, silver or similar reflective solution.

In addition to this fundamental piece, the parabolic screen module has the mobile azimuth arm (15), the azimuth motor group (16), the parabolic support (17), a solar panel (18), complemented with a battery accumulators, a sensor capsule (19) with at least four cells and a counterweight (20)

The mobile azimuth arm (15) sits on the front end of the mobile height arm (1 1), by means of the azimuth motor group (16), having at the other end the parabolic support (17), which it is attached to the parabolic screen (14). The position of this arm is defined by the angle "b" (27) (Fig. 4) which, in the case represented, is close to ninety sexagesimal degrees.

(Figures 2 to 5) show some of the different possible positions in this two-axis collector in its solar tracking process.

The solar panel (18), captures light energy with the necessary power for the correct operation of actuators and other consumption centers, being complemented with a battery of accumulators (not represented)

The sensor capsule (19) is also a fundamental part of the solar collector (1) of the invention. It is equipped with a minimum of four cells that guarantee perfect tracking of the sun on its path.

Finally, the counterweight (20) is positioned to achieve a good balance of all the moving components.

As it is a tubular structure that must work in the open, subjected to inclement weather, all tube ends are protected with caps (6) that also prevent the entry of insects and other animals. With this arrangement of the different components described, it is understood that any movement of the height mobile arm (1 1) affects the height movement of all the components of the parabolic screen module (14) and any movement of the axis of the group Azimuth motor (16) is accompanied by the rotation of the parabolic screen (14), of the solar panel (18). the sensor capsule (19) and the counterweight (20).

It is therefore a solar collector (1), with two axes, which is prepared to make a very precise follow-up of the sun on its path, directly receiving the sun's rays (28) and redirecting them towards the focus (22) which is located " off center. ' By matching the focus (22) of the parabolic screen (14) and the crossing of the height axis (12) with the azimuth axis (21), an energy concentration point is achieved, stable in space, which is where the receiver modules are placed, properly centered

Receiver modules

The main receiver modules envisaged by the inventor are those represented in (Figs 6, 7 and 8).

In (Fig. 7) the flask-type receiver module (7) is shown, the shape of which responds to a spherical container, made of heat-resistant glass material topped by a cylindrical neck, with cover (28), crossed by the fluid conduits (10) which, connected to the Huido deposit (9) or any other deposit, penetrate into the interior of the flask previously filled, in part, with stainless mesh (29), black in color, to favor the capture of radiation.

Its optimal positioning is when the geometric center of the sphere coincides with the focus (22), for which a flange (30) is provided with support means on the support structure (2)

In (Figs. 7 and 8) the heater-type receiver module (31) is shown, the shape of which responds to a thick, circular metal plate, which works as a diffuser (32) in whose lower part, in an off-centered position, it presents the pick-up bulb (32.1). The heater type receiver module (31) is lined with an insulating coating (33) and the pick-up bulb (32.1) is covered with a transparent dome (34).

Its optimal positioning is when the pick-up bulb (32.1) is centered in the focus (22) for which the aforementioned module rests on the support structure (2) using any means. The heat energy received by the collector bulb (32 1) is transmitted, by direct conduction, to the diffuser (32) and from there, to any element that is placed on top which, by way of example, can be a Stírling-type heat engine

In summary, it is understood that the fixed-focus solar collector with receiver modules (1) of the invention is a high-performance energy harvesting device in which temperatures that exceed 1000 degrees Celsius are achieved, allowing multiple objectives such as heating of fluids, food cooking, baking, water treatment), sterilization, transformation of heat energy into electrical energy (which is accumulated in batteries for later use), cold generation, food drying, canning and other similar purposes, with the advantage If it is a device on wheels, it can be towed by any vehicle and very suitable for use in isolated areas, country houses, caravans and even in urban areas where it can be installed inside homes or premises so that, by means of rails, it can be move the collector outside through a window. It can also be installed in gardens, balconies or on the terraces of buildings. Collector configuration

The following steps are followed for the initial adjustment of the manifold of the Invention:

1.- Orientation of the support structure (2) with the height axis (12) from East to West balancing it so that it is horizontal with the height mobile arm (1 1) oriented:

a) towards the south or north depending on the position of the sun at noon if we are between the tropics

b) to the south in the rest of the northern hemisphere

c) to the north in the rest of the southern hemisphere

2 - The movable height arm (1 1) is tilted on the height axis (12) until the azimuth axis (21) is perpendicular to the sun's rays (26) at solar noon, on that day and on that place (variable throughout the year according to the movement of the Earth as it follows the sun) that is, parallel to the axis of the apparent solar movement (axis of the ecliptic).

3.- The module of the parabolic screen is rotated on the azimuth axis (21) until the parabolic screen (14) is oriented towards the sun. Once these actions are carried out, the solar rays (26) are concentrated in the focus (22) of the parabolic screen (14) which, as already indicated above, on several occasions, coincides with the intersection of the height axis (12) with the axis of azimuth (21)

An important characteristic of the solar collector of the invention is that in a first configuration phase, the height is adjusted and the subsequent azimuthal tracking is automatic unlike other existing models in which it is first focused towards the sun and then heights are given in successive adjustments.

However, this does not preclude manual operation when deemed appropriate.

It is not considered necessary to make the content of this description more extensive so that an expert in the field can understand the scope and advantages derived from the invention, as well as develop and put into practice the object thereof. However, it should be understood that the invention has been described according to a preferred embodiment thereof, so that it may be susceptible to modifications without this impacting or implying any alteration of the foundation of said invention.That is, the terms in which it has been stated. preferred description of the invention, should always be taken in a broad and non-limiting nature.

Claims

1.- Fixed-focus solar collector with receiver modules (1) that describes a high-performance collector, with an oval-shaped parabolic screen collector, whose largest dimension is between 45 and 150 centimeters, intended for the collection of solar energy for further use by means of receiver modules, characterized in that, being of the two-axis type, it comprises a support structure, a movable arm in height, a parabolic screen module and receiver modules.

The support structure (2) is tubular, with two curved bars in the shape of a "C", joined together by several transverse bars (3) having, in its lower part, a pair of wheels (4) and legs (5) , a fluid reservoir (9) and a control desk (8), the tubular ends of the support structure (2) being closed by caps (6), the upper part of said structure being the one destined to support the modules Receivers that are preferably of the flask type (7), in the shape of a sphere, with a cylindrical neck and a lid (28) crossed by two fluid conduits (10) or of the heater type (31), in the form of a flat metal plate, circular, with a diffuser (32) and a bulb (32 1) in its lower part

The mobile height arm (11) is made up of an upper section in the shape of a "U" and a lower section, arched, which begins at the lowest part of the "U" and extends forward to the front of the device. which is related to the support structure (2), for rotation purposes, by means of a height axis (12) located on the upper edge of said structure and for movement purposes, through the action of a height motor group (23), which drives a telescopic cylinder of height (24), the ends of which sit on one of the transverse bars (3), close to the axis of the wheels and on a bracket (13), secured to the mobile arm of height (1 1), in the front third of said arm.

The parabolic screen module is made up of an oval parabolic screen (14), which, through the parabolic support (17), is linked to the mobile azimuth arm (15), driven by an azimuth motor group (18) , also supporting said movable azimuth arm (15), a solar panel (18), a sensor capsule (19) and a counterweight (20).

2.- Fixed focus solar collector with receiver modules, according to claim one, characterized in that the parabolic screen (14) is of the type known technically as "off-center", capturing the solar rays (26) and redirecting them towards the focus (22), located at the intersection of the height axis (12) with the azimuth axis (21), whose intersection defines a fixed point in space.

3.- Fixed focus solar collector with receiver modules, according to claims one and two, characterized in that the parabolic screen (14) is preferably one of which its active side has been technically treated with projection of one or more layers of chrome effect, Although it can also be one of those covered with aluminum, silver or similar reflective solution

4.- Fixed focus solar collector with receiver modules, according to claim one, characterized in that the solar panel (18), complemented with a battery of accumulators, feeds all the actuators and electrical devices of the device

5.- Fixed focus solar collector with receiver modules, according to claim one, characterized in that, once the height axis (12) has been adjusted, it has an automatic movement, governed by the solar tracker formed by a sensor capsule (19) of at least four cells and the control desk (8).

6.- Fixed focus solar collector with receiver modules, according to claim one, characterized in that the support structure (2), with its wheels (4), which are pneumatic, has a tow bar (not represented)

7. Fixed focus solar collector with receiver modules, according to claim one, characterized in that the flask-type receiver module (7) contains stainless mesh (29), black in color and is made of heat-resistant transparent glass.

8.- Fixed focus solar collector with receiver modules, according to claim one, characterized in that the heater-type receiver module (31) has the diffuser (32) lined with an insulating coating (33) and the bulb (34), in position off-center, it is surrounded by a transparent dome (34) of heat-resistant glass.