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Title:
MOBILE DEVICE TO CREATE SUN SHADE
Document Type and Number:
WIPO Patent Application WO/2020/125824
Kind Code:
A1
Abstract:
The invention relates to a mobile sun shading device which comprises at least one body consisting of a cover (1) of plastic foil (2) or cellulose-based foil (2) which is in the lower part provided with at least one opening (5) and which is lifted off the ground by an upward buoyant force generated by a difference in temperatures in the cover (1) and in the atmosphere, wherein the carrier of thermal energy is infrared radiation of the sun, wherein on at least 10 % of the surface, the foil (2) is provided with a surface that absorbs infrared radiation and the body cover (1) is fixed to the ground by fixation means (7).

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Inventors:
KRETEK ZDENEK (CZ)
Application Number:
PCT/CZ2019/050062
Publication Date:
June 25, 2020
Filing Date:
December 13, 2019
Export Citation:
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Assignee:
ECOS CHOCEN S R O (CZ)
International Classes:
A45B23/00; A01G13/02; B64B1/40
Foreign References:
EP0233673A11987-08-26
CH695246A52006-02-15
US20100157569A12010-06-24
DE2536547A11977-02-24
Attorney, Agent or Firm:
MUSIL, Dobroslav (CZ)
Download PDF:
Claims:
PATENT CLAIMS

1. A mobile sun shading device, characterized in that it comprises at least one body formed by a cover (1 ) of plastic foil (2) or cellulose-based foil (2) which is in the lower part provided with at least one opening (5) and which is lifted above the ground by an upward buoyant force generated by the difference in temperatures in the cover (1 ) and in the atmosphere, wherein the carrier of thermal energy is infrared radiation of the sun, whereby on at least 10 % of the surface, the foil (2) is provided with a surface absorbing infrared radiation and the cover (1 ) of the body is fixed to the ground by fixation means (7).

2. The mobile sun shading device according to claim 2, characterized in that the cover (1 ) of the body has a shape that resembles a geometric shape.

3. The mobile sun shading device according to claim 1 , characterized in that the plastic foil (2) of the cover (1 ) is coloured foil (2.1 ) which transmits and absorbs infrared radiation.

4. The mobile sun shading device according to claim 1 , characterized in that the plastic foil (2) of the cover (1 ) is clear foil (2.2) coated with infrared absorbing layers.

5. The mobile sun shading device according to claim 1 , characterized in that the plastic foil (2) of the cover (1 ) is bonded foil (2.3) consisting of clear parts of material and parts of material which absorbs infrared radiation.

6. The mobile sun shading device according to claim 1 , characterized in that the plastic foil (2) of the cover (1 ) is combined foil (2.4) in which clear surfaces and coloured infrared absorbing surfaces alternate.

7. The mobile sun shading device according to claim 1 , characterized in that the plastic foil (2) is clear foil (2.5) and inside the cover (1 ) of the body is arranged coloured perforated inner foil (3) which absorbs infrared radiation and is fixed inside the cover (1 ) in a vertical, horizontal or oblique direction.

8. The mobile sun shading device according to claim 1 , characterized in that the plastic foil (2) is clear and inside the cover (1 ) of the body is arranged coloured non-perforated inner foil (4) which absorbs infrared radiation and is fixed inside the cover (1 ) in a vertical, horizontal or oblique direction.

9. The mobile sun shading device according to claim 1 or 6, characterized in that the foil (2) of the cover (1 ) and the inner foils (3) and (4) have a thickness of 1 to 20 pm.

10. The mobile sun shading device according to claim 1 or 2, characterized in that the bodies formed by the covers (1 ) are connected to form strings.

1 1. The mobile sun shading device according to claim 1 , characterized in that the cover (1 ) of the body is made of bioplastics or recyclable plastics.

Description:
Mobile device to create sun shade

Technical field

The present invention relates to a mobile sun shading device providing shade particularly in areas with high solar intensity and with a great number of sunny days per year.

Background art

Nowadays, people in many regions of the earth deal with a problem of an abundance of sunlight, which makes it difficult to grow crops in areas lacking moisture. Shades or other structures allowing protection against light, especially against sunlight, have been known so far as devices which can be attached to buildings - frames or special arms. Shading in vegetable and fruit growing is particularly used for crops growing in greenhouses and shade is provided mainly by tarpaulins. Shaded areas in public spaces are also created mainly by using tarpaulins, whether made of natural or plastic materials. For example, an inflatable shading element according to patent FR2505903 is made of a flexible plastic foil hose, e.g. polyethylene foil, and is provided with connecting pieces for attaching the hose to a hinge or to another hose. Each hose consists of a flat folded strip of foil having groove strips on one side and a strip on a tongue on the other side, thereby forming a joint.

Patent EP2597987 discloses an inflatable umbrella/parasol, which is, however, intended to cover only a small space. These and other devices use air to create their shape, but do not allow to shade large areas and are dependent on the structures to which they are attached.

The object of the present invention is to propose a simple device which will be used especially in agriculture to assist with increasing fertile agricultural areas in the states of southern Europe, in Israel, Africa and virtually everywhere where the sun dries crops in the fields, even in irrigated areas, to prevent excessive evaporation of water. Furthermore, it is the object of the invention to propose a device which will enable to transform deserts into fertile farmland and will be also usable in cities, towns and villages to reduce excessive surface temperatures, etc.

Principle of the invention

The above-mentioned disadvantages are removed by a mobile sun shading device according to the invention, whose principle consists in that it comprises at least one body formed by a cover made of plastic foil which is in its lower part provided with at least one opening and which is lifted above the ground by an upward buoyant force generated by the differences in temperatures inside the cover and in the ambient atmosphere, wherein the carrier of thermal energy is infrared radiation from the sun. At least 10% of the foil surface is formed by a surface absorbing infrared radiation and the cover of the body is fixed to the ground by fixation means. The principle of the solution is also the fact that the body has a shape resembling a geometric shape, as well as the fact the plastic foil of the cover may be coloured foil which transmits and absorbs infrared radiation. The plastic foil of the cover may be clear foil (or transparent foil) with coatings absorbing infrared radiation, or bonded foil consisting of clear parts of the material and parts of the infrared absorbing material, or combined foil with alternating clear and coloured infrared absorbing surfaces. The plastic foil may also be clear and inside the cover is arranged coloured perforated or unperforated inner foil which absorbs infrared radiation and is fixedly attached in a vertical, horizontal or oblique direction. It is also essential for the invention that the foil of the cover and the inner coloured perforated foil as well as unperforated inner foil have a thickness of 1 to 20 pm. The bodies formed by the covers are connected to form strings. The principle of the solution is also that the complete body of the device can be made mainly of bioplastics as well as of recyclable plastics.

As mentioned above, the body is lifted above the ground by the force which is generated by the heat due to the difference in air temperatures in the cover and in the atmosphere, i.e. the difference in the air densities in the cover and in the atmosphere. To lift the body into the atmosphere, the device uses a known phenomenon according to Archimedes' Principle, which also applies in the atmosphere, namely that the buoyant force acts on the body when in the atmosphere according to the formula: F vz = v. p . g;

where V... volume of the body; p...air density; g... gravitational constant

p = 1.29 kg/m 3 (average air density)

Bodies made of substances the average density of which is less than air density rise in the atmosphere (F vz > F g ). If the average density of the body is greater than the air density, the body in the atmosphere sinks (F g > F vz ).

Therefore, the force by which the "body" is buoyed up in the air also depends on the ambient air temperature. To put it more precisely, the decisive factor is the difference in air temperatures in the“body” and in its surroundings. The cold air in the surroundings buoys up the “body” better than when it has a slightly higher temperature. Experiments conducted by deflating balloons showed that the buoyant force acted on the body pointed vertically upwards. If the average density of the body is less than the air density, the body rises in the atmosphere. Atmospheric pressure decreases with altitude, the pressure around the top of the balloon is lower than at the bottom. The resultant compressive force points upwards. Each balloon - the body - can only reach certain height, because with increasing height the air density decreases, therefore the buoyant force also decreases, since at certain height the buoyancy force is equal to the gravitational force. For the production of the body, the choice of material is important. To heat gases or air, solar radiation is used, i.e., its component - infrared radiation IR with a wavelength of 0.78 microns to 1.4 microns.

The sun shading device is used to shade or shield regions affected by excessive solar radiation and to prevent their excessive drying by evaporation of water by its body with an inner IR foil or with an IR layer applied to various parts of the body circumference. Shading will reduce the surface temperatures of such regions, which has a positive impact especially on crop yields and the cultivation of crops in desert areas. The main benefit of shading is therefore in agriculture. In addition, shading is applicable to large areas in cities, towns and villages as a replacement of natural shade for citizens. It reduces the temperature of surfaces heated by the sun and the evaporation of water and liquids especially in plants, including in areas with irrigated crops, but also in humans and animals and in various industrial plants as well. Moreover, the device according to the invention can be used to reduce rapid snow melting in snow-covered areas which are exposed to intense sunlight, such as ski slopes and ice-covered regions, glaciers, etc. The device is easy to use and is capable of rising without using any source of energy other than infrared radiation.

Description of the drawings

The invention is illustrated in more detail in the drawings which represent:

Fig. 1 is a general view of the basic body of a mobile sun shading device which is formed by a rectangular shaped cover with a filling/compensating opening on the lower part of the body and fixed to the ground, wherein the cover is a coloured foil which transmits and absorbs infrared radiation;

Fig. 2 - the body of the device, wherein the cover is formed by clear foil, covered with coatings absorbing infrared radiation;

Fig. 3 - the body of the device, wherein the cover consists of bonded foil, that is, foil with clear and dark surfaces;

Fig. 4 - the body of the device, wherein the cover is formed by combined foil, with clear and coloured areas;

Fig. 5 - the body with inner foils;

Fig. 6 - a mushroom-shaped body;

Fig. 7 - an example of the body fixed to the ground and a folded body;

Fig. 8 - an example of several bodies grouped together.

Examples of embodiment

The following exemplary embodiments of a mobile sun shading device, hereinafter referred to as the device, are based on the basic principle, namely that a difference in temperatures outside and inside the body of the device generates a force which sets the body into motion, i.e. moves the body upwards into the atmosphere and by fixing the body or a string of bodies at a selected height above the ground surface and the desired shade is created by the body. The mobile sun shading device according to an exemplary embodiment comprises at least one rectangular body (see Fig. 1 ) which consists of a cover 1 of foil and which is provided with at least one filling, overflow/compensating opening 5 at the bottom. The opening 5 serves to fill the body with air and to ensure discharge of oscillating and expanding air and gas molecules as well as to balance and adjust the air pressure and the air density in the body depending on the temperature of heating by the sun, i.e. by infrared radiation. Above the ground, the body cover 1 is buoyed up by a force generated by heat due to the difference in temperatures inside the cover 1 and in the ambient atmosphere. The carrier of thermal energy is the infrared radiation of the sun. Therefore, at least 10 % of the surface of the plastic foil 2 must be composed of an infrared absorbing surface. In the embodiment according to Fig. 1 , the plastic foil 2 of the cover 1 is coloured foil 2.1 , which transmits and absorbs infrared radiation. Another variant of the foil 2 of the cover 1 is clear foil 2.2 coated with layers which absorb infrared radiation, whereby these layers constitute 10-90 % of the surface (see Fig. 2). Another variant is that the plastic foil is bonded foil 2.3, which comprises clear parts of the material and parts of the material which absorbs infrared radiation (see Fig. 3). The ratios of infrared absorbing and transmissive surfaces are always selected to meet requirements for various combinations of materials, colours and designs of the device, as well as to comply with the above calculations and principles. The foil 2.3 is joined by welding, gluing and the infrared absorbing parts are coloured or completely dark foils. Finally, the cover 1 is a combined foil 2.4 (Fig. 4), where clear and coloured infrared absorbing surfaces alternate - the foil 2.4 thus treated is provided with lighter and darker areas, produced, for example, by printing. Another variant is that the plastic foil 2 of the cover 1 is clear foil 2.5 and inside the body cover 1 is fixedly attached coloured perforated inner foil 3, which is a good absorber of infrared radiation, especially in a black variant. Also, the inner foil can be non-perforated foil 4. Both foils 3, 4 can be fixed inside the cover 1 in different positions and embodiments in a vertical, horizontal direction (Fig. 5) or in an oblique direction. The inner IR foil 3, 4, the coloured foil 2.1 , the foil 2.2 coated with IR layers, the bonded foil 2.3 or the combined foil 2.4 can absorb infrared radiation and convert it into heat. All the types of foil 2.1 , 2.2, 2.3, 2.4 and 2.5 mentioned above can be used on the cover 1 in in a variety of other combinations, depending on the purpose and specific needs. The material of the cover 1 , but also of the inner foils 3, is welded, glued, etc., very thin plastic foil 2 having a thickness of 1 -20 microns, or up to 100 microns, which transmits different intensity of infrared radiation - i.e., the forms of foil include 2.1 , 2.2, 2.3, 2.4 and 2.5. Some shapes of the cover can be produced from one piece at a time, so there is no need for gluing or welding. The foil material is, for example, polypropylene, BOPET foil, polyethylene, polyolefin, suitable foils are resistant to UV radiation and weathering conditions. However, these materials can have a negative impact on the environment, which can be solved by waste collection or multiple reuse. More suitable materials are biodegradable plastics and biomaterials from which the device will be made in the future and which are being developed. At present, these are mainly cellulose-based materials.

It is desirable to alternate the surfaces of the transparent clear foil and the IR layer such that the ratio of the clear foil through which passes at least 10-99 % of the infrared radiation and the applied IR sensitive layer ratio is 1 :1 , 1 :2, 1 :3, 1 :4, etc., whereby the ratio may also be the opposite. The IR layers are applied to the foil 2.1 in the form of strips, squares and the like. This leads to the creation of a black-and- white or even coloured surface, one part of which transmits infrared radiation and the other part absorbs this radiation depending on the movement of the device according to the speed of movement of the surrounding air. The size and number of the openings 5 also depend on the size of the body, on their shapes given by the cover, and on the cases when there are multiple bodies interconnected in one system of bodies forming ultimately a single body. In the above embodiments of the body made of only one piece or without the inner foil 3, 4, the ability to absorb infrared radiation is about 10-100 %.

The embodiment of the body cover 1 may have various shapes, such as bags, cubes, cuboids, but also spheres, hemispheres, pyramids, inverted pyramids, cylinders and combinations thereof, and therefore the embodiment does not include only spatial bodies resembling geometric shapes. Fig. 6 it is in the shape of a “mushroom". This embodiment is suitable, for example, for providing shading of people.

The cover 1 can have any dimensions. The ratio of the length, height and width (depth) of the bodies is predetermined by calculation based on the above physical laws and by adhering to them to suit the environment and the purpose of the shading. Individual bodies can be connected into strings, such as connected microtene bags for different applications (the required number of pieces is separated by tearing off). The individual non-inflated bodies are preferably wound on rolls which are, for example, 5 m wide and wound in a foil length of approximately 100 m. This can result in the formation of a strip which can be in various ways separated and re connected. If, for example, 100 pieces of these rolls are used side by side with a height determined by the operator on the spot, the resulting dimension in this case - is 500 m long shading strip, whereby the roll is 5 m wide x e.g. 60 m high x 1 m deep, etc. and others in rows behind each other, but also side by side. Another example of dimensions is roll length - 5m by 50m foil x width / depth - 1 m x height 2m - it consists of a set of several bodies having overall dimensions: length - 500 m x width (depth) 1 m x height 50m.

The sun shading device will operate at heights that will be allowed by the strength of the material used, e.g., in the range of about 1 to 100 meters or even more, and basically in any length and width (depth), according to the requirements.

To heat the air gases, infrared radiation of wavelengths ranging from 0.78 to 1.4 pm with the highest emissivity of 1.2 pm is used, allowing solar radiation to pass through the 20 km air cover of the earth almost without loss.

Assembly and disassembly of the device can be completely manual or automated, electronically controlled - completely or partially remotely or locally. To fill air, it is advisable to use a simple ventilator, which in return can be used in addition to the filling of the body to quickly suck the air out of the body. The device may consist of individual mechanically interconnected sections with the possibility of being interconnected into one complex body or several bodies and shapes (see Fig. 7). This solution requires interconnection also by air connections - by channels made of the same and similar material and its various combinations as the device. In the case of manual or machine disassembly, the device already extended and arranged at the required height can be gradually lowered down from the working position before the end of the day or sunshine, one piece at a time, e.g. by means of a pair of simple rotatable rollers. The spacing of the rollers can be optionally adjusted, the air is forced out of the machine by means of the rollers and the device can be simultaneously wound onto the original reel onto which it was wound before using the device. The air can also be sucked from the device by a hand-operated or electric ventilator which operates on batteries or is connected to a local power supply or generator, etc.

The device can also be equipped with self-adhesive or velcro stoppers or flaps in the upper part, or with other plastic flaps, preferably rotatable and easy to manipulate, which can be opened from the ground, preferably by handling cables, gradually during disassembly as described above, thereby enabling rewinding on the original reel of air exit from the body of the device. The device can also be disassembled by manually folding the bodies, one body on top of the other, as is the case, for example, with an accordion, with the possibility of using a wooden slat for pushing the air out. The rest of the air is pushed out by its own weight, and the device, due to its low weight, can then be weighted with stones and other suitable weights and stored on site until the next day.

The whole device composed of the individual bodies (Fig. 8) is then fixed to the ground by the fixation means 7, namely by cables of various materials, preferably plastic, which are attached to the ground by weights or any fixing material, such as weights, screws, rods, pins, structures, buildings, etc. These fixing means 7 also fulfill a handling function. The handling cables need not be provided on all sides of the cover 1 and, if so, they will be easy to install and remove. The handling cables control the inclination of the body with respect to the sun and can in some cases influence the shape of the body and its inclination towards the ground. The fixation means, which may also fulfill the function of the handling cables, can be further used for dismantling the device.