VENTILATION SYSTEM, ROOM, CONFINED SPACE AND BUILDING EQUIPPED WITH SUCH A SYSTEM, AND ASSOCIATED METHOD

FIELD OF THE INVENTION

The present invention relates to the general technical field of ventilation systems, in particular inside buildings, and more particularly systems for controlled ventilation of a confined space or a room, in order for example to destratify, homogenize, renew, filter, or treat air contained in said space or said room.

The present invention more particularly relates to a ventilation system for a room or a confined space having a ceiling, said ventilation system comprising at least:

- a blowing device for blowing a gas into said room or said confined space, and
- a suction device for drawing out the gas contained in said room or said confined space.

The present invention further relates to a method of ventilating a room or a confined space having a ceiling, the method comprising at least:

- a step of blowing a gas into said room or said confined space, and
- a step of drawing out the gas contained in said room or said confined space.

PRIOR ART

It is already known to use ventilation systems, in particular in commercial and public buildings, such as hospitals. Such systems may have distinct or complementary functions, such as, e.g. commercial building air-conditioning or heating, or air renewal in a hospital or clinic operating room. Thus, operating block ventilation systems are known, which are specifically designed to blow air via a ceiling-mounted blowing mouth, and to extract the air from the room via suction mouths integrated in vertical walls, near to the floor. This particular configuration enables “clean” air to be blown directly to the operation table, while driving most of the air pollutants close to the floor, where they are then evacuated by suction.

This known configuration, dedicated to particularly demanding cases, is however not optimum.

Indeed, this known configuration does not allow a full and rapid renewal of the air contained in the room, and leaves many “dead areas”, i.e. areas in the room where the air is not renewed, or only very slightly, in particular areas away from the blow and suction mouths, as well as the areas protected from air movement, such as those underneath furniture (operating table, light halo, etc.). Moreover, these known ventilation systems do not allow the air contained in the room to be homogenized, the air remaining distributed in several layers, e.g. according to a temperature and/or hygrometry gradient, in a substantial portion of the room. This known ventilation system configuration moreover suffers from the risk of dropping contaminated components (salivary drops from nursing staff, suspended elements, contaminants, dust . . . ) to the body of the patient placed on an operating table of the room. The known ventilation systems are moreover often unpleasant for people located under or near the air distribution system supplying the room. Finally, the manufacturing and installation of such known ventilation systems meet significant constraints often expensive, as the integration of the ventilation elements in the ceiling and the walls has generally to be planned right from the construction of the building housing the room to be ventilated.

Moreover, mobile air-treatment systems are known, which are intended to be installed in the room to be treated. Even though these nomadic systems may offer an acceptable level of performance to locally cool the air or treat it against viruses, they are nevertheless not suitable for handling the entire volume of air contained in the room, so that untreated, “dead” volumes remain.

DISCLOSURE OF THE INVENTION

The objects assigned to the present invention thus aim to remedy the various drawbacks mentioned hereinabove and to propose a new ventilation system whose design enables to renew the air, and more generally the gas, contained in a room or a confined space, in a rapid and optimum manner, i.e. as completely as possible by limiting or even eliminating the dead areas, while being of simple, robust design, easily adaptable to the various air, and more generally gas, treatment systems.

Another object of the invention aims to propose a new ventilation system that is easy and rapid to manufacture.

Another object of the invention aims to propose a new ventilation system that makes it possible to easily extract all or most of the gas contained in a room or a confined space, to renew it, and in particular to treat it to then reintroduce it or not, in totality or in part, into said room, or to expel it outside.

Another object of the invention aims to propose a new ventilation system whose design enables an excellent compromise to be obtained between its overall cost and its ability to treat all or most of the volume of air, generally gas, contained in the confined space.

Another object of the invention aims to propose a new ventilation system that is particularly compact.

Another object of the invention aims to propose a new ventilation system whose installation in a room or a confined space to ventilate the latter can be made in a particularly simple, easy, and cost-effective manner.

Another object of the invention aims to propose a new ventilation system that is particularly simple to integrate in a room or a confined space to be ventilated from both a practical and aesthetic point of view.

Another object of the invention aims to propose a new ventilation system whose design makes it universally adaptable to different types of rooms or confined spaces, or more generally to different types of closed volumes, fixed (e.g. homes, hospitals, supermarkets, cisterns, refrigerated rooms) or mobile (e.g. trains or planes), to be ventilated.

Another object of the invention aims to propose a new ventilation system that is modular in nature, and whose principle makes it possible to treat the air, or more generally the gas, in a room or a confined space, without size limitation, or more generally closed volumes without size limitations.

Another object of the invention aims to propose a new versatile ventilation system that can fulfil various functions related to ventilation, and in particular extraction, distribution, destratification, homogenization of the air or the gas in a room in order to control heating, cooling, deodorization, pollution control or disinfection of the air or gas in question.

Another object of the invention aims to propose a new ventilated room or a new confined space capable of renewing the air, and more generally the gas, it contains, in a rapid and optimum manner, i.e. as completely as possible by leaving very few, or even no, dead areas.

Another object of the invention aims to propose a new ventilation method that is inexpensive, simple, and easy to implement, while having an optimized air renewal efficiency.

The objects assigned to the invention are achieved by means of a ventilation system for a room or a confined space having a ceiling, said ventilation system comprising at least:

- a blowing device for blowing a gas into said room or said confined space, and
- a suction device for drawing out the gas contained in said room or said confined space,
  
  characterized in that the suction device comprises a plurality of suction mouths distributed one below the other in a substantially vertical direction, said suction mouths comprising at least one upper suction mouth and one lower suction mouth, as well as intermediate suction mouths located between said upper and lower suction mouths, the distance between said upper and lower suction mouths being greater than at least half the height beneath the ceiling of said room or said confined space, the suction device comprising at least one suction pipe extending substantially in a longitudinal extension direction designed to be placed substantially vertically, said suction pipe being provided with said suction mouths, the blowing device comprising a plurality of blowing mouths, the blowing device comprising at least one blowing pipe extending substantially in a longitudinal extension direction designed to be placed substantially vertically, said blowing pipe being provided with said blowing mouths,
  
  and in that said suction mouths are distributed over said suction pipe in such a way as to provide a radial suction of the gas from the room or the confined space and/or in that said blowing mouths are distributed over said blowing pipe in such a way as to provide the gas emitted therefrom with a radial distribution.

The objects assigned to the invention are also achieved by means of a ventilated room or confined space comprising at least a ceiling, said room or said confined space being fitted with a ventilation system as described hereinabove.

The objects assigned to the invention are also achieved by means of a building or a mobile structure comprising at least one ventilated room or confined space as mentioned hereinabove.

The objects assigned to the invention are achieved by means of a method for ventilating a room or a confined space having a ceiling, the method comprising at least:

- a step of blowing a gas into said room or said confined space, and
- a step of drawing out the gas contained in said room or said confined space, characterized in that the suction step is performed via a plurality of suction mouths of a suction device, the suction mouths being distributed one below the other in a substantially vertical direction, said suction mouths comprising at least one upper suction mouth and one lower suction mouth, as well as intermediate suction mouths located between said upper and lower suction mouths, the distance between said upper and lower suction mouths being greater than at least half the height beneath the ceiling of said room or said confined space, the suction device comprising at least one suction pipe extending substantially in a longitudinal extension direction designed to be placed substantially vertically, said suction pipe being provided with said suction mouths, the blowing step being performed via a plurality of blowing mouths, of a blowing device, the blowing device comprising at least one blowing pipe extending substantially in a longitudinal extension direction designed to be placed substantially vertically, said blowing pipe being provided with said blowing mouths,
  
  and in that said suction mouths are distributed over said suction pipe in such a way as to provide a radial suction of the gas from the room or the confined space and/or in that said blowing mouths are distributed over said blowing pipe in such a way as to provide the gas emitted therefrom with a radial distribution.

BRIEF DESCRIPTION OF THE DRAWINGS

Other objects and advantages of the invention will appear in more detail upon reading of the following description, with reference to the appended drawings, given by way of purely illustrative and non-limiting examples, in which:

FIG. 1 illustrates, in a schematic side view, a first embodiment of a ventilation system according to the invention, installed in a room.

FIG. 2 illustrates, in a schematic top view, the ventilation system of FIG. 1.

FIG. 3 illustrates, in a schematic side view, a second embodiment of a ventilation system according to the invention, installed in a room.

FIG. 4 illustrates, in a schematic top view, an embodiment detail of a blowing device according to a third embodiment of the invention.

FIG. 5 illustrates, in a schematic top view, an embodiment detail of a blowing device according to a fourth embodiment of the invention.

FIG. 6 illustrates, in a schematic top view, a fifth embodiment of a ventilation system according to the invention, installed in a large room, for example a supermarket, to ensure air treatment, and implementing a plurality of suction/blowing modules (“doublets”) distributed on a regular basis in the room in question to each draw and blow air over 360°.

FIG. 7 illustrates, in a schematic top view, a sixth embodiment of a ventilation system according to the invention, installed in an operating block.

FIG. 8 illustrates, in a schematic side view, the ventilation system of FIG. 7.

FIG. 9 illustrates, in a schematic top view, a seventh embodiment of a ventilation system according to the invention, installed in a room.

FIG. 10 illustrates, in a schematic top view, an eighth embodiment of a ventilation system according to the invention, installed in a room.

FIG. 11 illustrates, in a schematic side view, a ninth embodiment of a ventilation system according to the invention, installed in a theatre with tiered seating.

FIG. 12 illustrates, in a schematic top view, the theatre of FIG. 11.

FIG. 13 illustrates, in schematic cross-sectional and longitudinal-sectional side views, a train wagon fitted with a ventilation device according to the invention.

BEST WAY TO IMPLEMENT THE INVENTION

As illustrated in the figures, the invention relates, in a first aspect, to a ventilation system 1 of a room 2 or a confined space having a ceiling 3. Obviously, said room 2 or said confined space advantageously comprises several side walls 4, preferably vertical, said side walls 4 being for example four in number. Said room 2 or said confined space further advantageously comprises a floor 5. Said side walls 4, said floor 5 and said ceiling 3 preferentially delimit said room 2 or said confined space and more precisely the inner space thereof. Preferably, the room 2 or said confined space further comprises corners 6 separating said side walls 4. Said room 2 or said confined space can be consisted by any enclosed or closed volume within a building or an immobile or mobile structure, such a vehicle (e.g. train or plane). Said room 2 can also be designed to accommodate both people (staff, customers, etc.) and/or animals, or installations, e.g. computer installations (in particular, servers), or also be designed to store products (foodstuffs, raw materials, processed products, etc.). Said confined space can be consisted by any enclosed or closed volume, within a mobile or immobile structure, said volume being generally not designed to accommodate staff for a long time, such as a cistern, a storage place, a tank, a warehouse (the definition of a confined space may, in some cases, overlap with that of a room), a vault, a ship's hold, a silo, a tunnel, etc. Said room 2 or said confined space can moreover have a variable height beneath the ceiling, as in the case of a theatre or an amphitheater cinema (FIGS. 11 and 12). Said ventilation system 1 is therefore preferably intended to fit said room 2 or said confined space to ventilate it. More generally, said room 2 or said confined space can be formed by any closed volume having to be ventilated, said closed volume being partially or fully closed.

Therefore, the invention further relates, in a second aspect, to a ventilated room or confined space 2, comprising at least a ceiling 3, said room 2 or said confined space being fitted with a ventilation system 1 as described hereinabove and hereinafter.

The invention also relates, according to a third aspect, to a building or a mobile structure (e.g., a vehicle, such as a road or rail vehicle, a ship or an aircraft) comprising at least one ventilated room or confined space 2 as described hereinabove and hereinafter.

According to the invention, the ventilation system 1 comprises at least one blowing device 7 designed to blow a gas into said room 2 or said confined space, i.e. the blowing device 7 forms a gas distribution device. The ventilation system 1 also comprises at least one suction device 8 designed to draw out the gas contained in said room 2 or said confined space, i.e. the suction device 8 forms a gas extraction device. Therefore, the ventilation system 1 advantageously forms a gas extraction and distribution system.

The gas is in particular air, i.e. a mixture mainly comprising dinitrogen and dioxygen (as well as carbon dioxide, argon etc. in smaller quantities), but it can also comprise, or be formed by, steam, e.g. water vapour. The gas can however be consisted of other components, and e.g. the gas mainly comprises dioxygen, or also mainly one or several carbon oxides, or any compound that is gaseous in particular at ambient temperature (e.g. between 1° and 30° C.). The gas is advantageously mainly present in a free space of said room 2 or said confined space, i.e. the space delimited by said side walls 4, the floor 5 and the ceiling 3 and not by other walls or partitions. The arrows that do not refer to a number in the figures generally represent a localized air flow.

The ventilation system 1 is advantageously designed to renew the gas, and in particular air, within a room 2 or a confined space, i.e. on the one hand extract the gas already present within said room 2 or said confined space out of it (or at least out of the free space thereof), by means of the suction device 8, and in the other hand (“new”) gas that has passed through the ventilation system 1, by means of the blowing device 7. Advantageously, said “new” gas has been treated by said ventilation system 1 (e.g. by a treatment device included in said system 1) and/or comes from the outside of the room 2 or the confined space, in such a way that it is formed of external gas and/or treated gas, it being understood that in any case said new gas passes through said ventilation system 1.

Said blowing and suction devices 7, 8 are preferentially designed to operate continuously, the gas passing successively in the blowing device 7, the room 2 or the confined space, the suction device 8, and then possible outside the room 2 (or the confined space) and/or again the blowing device 7, as will be seen hereinafter. Said blowing device 7 is thus preferably designed to blow gas into the room 2 or the confined space, whereas said suction device 8 is advantageously designed to extract gas from the room 2 or said confined space.

According to the invention, the suction device 8 comprises a plurality of suction mouths 9, 10, 11. Preferably, the blowing device 7 comprises a plurality of blowing mouths 12, 13, 14. As used herein, the word “mouth” has to be understood in its broadest sense, so that it can indifferently refer to any kind of openings, holes, pores or other, whatever the size and configuration thereof. Each of said mouths 9, 10, 11, 12, 13, 14 can thus be formed, for example, by one or several hole(s) or opening(s), in the form, for examples, of perforations made through a metal sheet, by the through-pores in a wall made of rigid, flexible or flabby porous material, or even by the interstices between the threads or fibres of a woven or non-woven textile or metal material, e.g. a textile fabric, a metal fabric or a combination of textile and metal fabrics.

Said suction mouths 9, 10, 11 are distributed, e.g. in layers, one below the other in a substantially vertical direction (materialized by the axis Z in FIGS. 1 to 3 and 11). In a particular embodiment, the suction mouths 9, 10, 11 are positioned, preferably in layers one below the other, in a substantially vertical direction, and form for example one or several substantially vertical row(s) of suction mouths 9, 10, 11, i.e. without significant offset in the horizontal plane of the suction mouths 9, 10, 11 with respect to each other, this offset being for example not greater than a few cm, preferably not greater than 10 cm, more preferentially not greater than 5 cm, even more preferentially not greater than 3 cm. Said suction mouths 9, 10, 11 are thus advantageously designed and distributed to draw out the gas from the room 2 or the confined space.

Still according to the invention, said suction mouths 9, 10, 11 comprise at least one upper suction mouth 9 and one lower suction mouth 10, as well as intermediate suction mouths 11 located between said upper 9 and lower 10 suction mouths. The intermediate suction mouths 12 are, according to a particular embodiment, distributed on a substantially regular basis, in particular along the vertical direction and/or in the horizontal plane. It is of course possible that some suction mouths 9, 10, 11 are at the same height (i.e. in a same horizontal plane), but there are preferably necessarily suction mouths 9, 10, 11 distributed vertically one above the other, with a spacing between each other in the horizontal plane that is preferably less than 10 cm, more preferentially less than 5 cm, even more preferentially less than 3 cm, and even more preferentially essentially zero. Examples of horizontal planes are materialized in FIGS. 1, 2 and 12, by the axes X and Y (that are thus advantageously substantially perpendicular to the axis Z).

According to the invention, the distance between said upper 9 and lower 10 suction mouths is greater than at least half the height beneath the ceiling 3 of said room 2 or said confined space. Said height beneath the ceiling is measured locally, i.e. at the place where said suction device 8 is located. Advantageously, the distance between said upper 9 and lower 10 suction mouths is greater than 80%, preferably greater than 90%, of the height beneath the ceiling 3 of said room 2 or said confined space, and more preferentially is almost-equal or equal to the height beneath the ceiling 3 of said room 2 or said confined space. The height beneath the ceiling 3 is preferably the distance, measured vertically, between the floor 5 and the ceiling 3 of said room 2 or said confined space. Therefore, the ventilation system 1 of the invention advantageously enables to ventilate, i.e. renew, all the layers of gas present within the room 2 or the confined space. For example, the air present in a room tends to stratify into different layers of different temperatures and different densities, with the layers of smallest density and the hottest at the top (e.g. 30° C.) close to the ceiling 3, and the layers of greatest density and the coldest at the bottom (e.g. 17° C.) close to the floor 5, with a temperature gradient between these two extreme layers.

Preferentially, the density and/or size (of several) of the suction mouths 9, 10, 11 (among) the closest to the ceiling 3 and/or the floor 5 is greater than that of the other suction mouths 9, 10, 11. In other words, the suction device 8 is preferentially designed to have greatest suction capacity near to the floor 5 and/or near to the ceiling 3. Such a configuration, illustrated in particular in FIG. 3, enables to renew more rapidly and more fully the extreme strata of gas that tend to stagnate, and that are usually more difficult, or even impossible to ventilate and/or renew. Indeed, the central layers (in terms of altitude, height) of the room 2 or the confined space usually tend to be renewed more rapidly, because they have an average density/temperature. Thus, the “new” gas (i.e. the external and/or treated gas) introduced into the room or the confined space from the ventilation system 1 will usually position in the middle of the gas layers, at mid-height of the room 2 or the confined space, before this “median” layer extends and occupies the whole room 2 or confined space. This is made more easily with the ventilation system 1 of the invention that acts on all the layers, and this is improved by increasing the density and/or size of the blowing mouths 12, 13, 14 and/or suction mouths 9, 10, 11 close to the ceiling 3 and/or the floor 5. According to a particular embodiment, in combination with or independently of the above, the density and/or size (of several) of the blowing mouths 12, 13, 14 (among) the closest to the ceiling 3 and/or the floor 5 is greater than that of the other blowing mouths 12, 13, 14. Therefore, the blowing device 7 can be designed to have greater blowing capacity near to the floor 5 and/or near to the ceiling 3.

According to a particular embodiment, said suction device 8 has a substantially elongated shape and is designed to be placed, in operation, substantially vertically (materialized by the axis Z in figures, and in particular FIGS. 1 to 3 and 11). According to the particular embodiment illustrated in the figures, said suction device 8 thus advantageously forms a suction column designed to be positioned substantially vertically and to occupy the room 2 or the confined space over a substantial portion of its height, and preferably said suction column has the same size (e.g. to within 5%) as the height beneath the ceiling 3 of said room 2 or said confined space.

According to a particular embodiment, and as mentioned hereinabove, the blowing device 7 comprises a plurality of blowing mouths 12, 13, 14. Said blowing mouths 12, 13, 14 advantageously comprise at least one upper blowing mouth 12 and one lower blowing mouth 13, as well as intermediate blowing mouths 14 located between said upper 12 and lower 13 blowing mouths. The intermediate blowing mouths 14 are, according to a particular embodiment, distributed on a substantially regular basis, in particular along the vertical direction and/or in the horizontal plane. It is of course possible that some blowing mouths 12, 13, 14 are at the same height (i.e. in a same horizontal plane), but there are preferably necessarily blowing mouths 12, 13, 14 distributed vertically one above the other, with a spacing between each other in the horizontal plane that is preferably less than 10 cm, more preferentially less than 5 cm, even more preferentially less than 3 cm, and even more preferentially essentially zero.

Advantageously, the distance between said upper 12 and lower 13 blowing mouths is greater than at least half the height beneath the ceiling 3 of said room 2 or said confined space. Said height beneath the ceiling is measured locally, i.e. at the place where said blowing device 7 is located. Advantageously, the distance between said upper 12 and lower 13 blowing mouths is greater than 80%, preferably greater than 90%, of the height beneath the ceiling 3 of said room 2 or said confined space, and more preferentially is almost-equal or equal to the height beneath the ceiling 3 of said room 2 or said confined space.

Preferably, said blowing device 7 has a substantially elongated shape and is designed to be placed, in operation, substantially vertically. According to this particular embodiment, said blowing device 7 thus advantageously forms a suction column designed to be positioned substantially vertically and to occupy the room 2 or the confined space over a substantial portion of its height, and preferably said suction column has the same size (e.g. to within 5%) as the height beneath the ceiling 3 of said room 2 or said confined space.

Advantageously, the suction device 8 comprises a wall forming a suction pipe (preferably, that described hereinafter), with holes distributed over the height of said wall and passing through the latter to form said suction mouths 9, 10, 11. Said wall is preferably at least partly curved in the plane perpendicular to the longitudinal extension direction of the suction pipe, the curved portion of said wall advantageously carrying said suction mouths 9, 10, 11. For example, said wall includes a sheet metal plate perforated to form said holes, or a textile or fibrous panel (preferably woven or possibly non-woven), the interstices between the threads or fibres of which form said holes, or also a panel made of a porous material, the pores of which are pass-through to form said holes. Said wall can for example be in the form a cylindrical column, preferably of circular (or elliptical or oval) basis, as for example a tube, which is arranged vertically and whose side wall can for example be perforated with a distribution of holes covering the height and the periphery of the column, over an angular sector of 360° in order to draw out the gas radially over 360°, or less (for example 90° or) 180°, as a function of installation configuration. According to a particular alternative of the invention, the suction device 8 can hence comprise or be formed by a vertical perforated suction tube (for example, in metal or polymer), said perforations forming said suction mouths 9, 10, 11.

In the case in which the room 2 or the confined space has a variable height beneath the ceiling (cf. FIGS. 11 and 12), which is the case for example of certain theatres or cinemas (which, so fitted with the ventilation device 1, constitute rooms 2 in accordance with the invention), the blowing device 7 is preferentially arranged in a first area 2′ of the room 2 or the confined space where the height beneath the ceiling is the greatest, whereas the suction device 8 is arranged away from, and preferably opposite, the blowing device 7, in a second area 2″ of the room 2 or the confined space where the height beneath the ceiling is the smallest. Thanks to this technical measure, it is possible to obtain particularly efficient renewal, homogenization and destratification of the air within the room 2 or the confined space. It is of course perfectly possible, as illustrated in FIG. 12, that the ventilation system 1 comprises several blowing devices 7 and several suction devices 8 such as mentioned hereinabove, as illustrated in FIG. 12, and that one or several (e.g. two) of said blowing devices 7 are arranged at said first area 2′, e.g. on either side of a screen or a scene 25, whereas one or several (e.g. two) of said suction devices 8 are arranged at said second area 2″, e.g. at the very top of a theatre or cinema, and that one or several other (e.g. one) of said suction devices 8 is (are) arranged at said first area 2′ away from the blowing devices 7 arranged in said first area 2′, e.g. behind the screen of a scene 25 of a theatre or cinema. Said suction device(s) 8 in said first area 2′ are then advantageously arranged towards, preferably against, a first side wall 4′ of the room 2 or the confined space, whereas said suction device(s) 8 in said second area 2″ the suction device 8 is arranged opposite the blowing device 7, towards, preferably against, a second side wall 4″ opposite to said first side wall 4′. According to a particular embodiment that can be substantially close or similar to what has been described hereinabove, the blowing device 7 is arranged towards, preferably against, a first side wall 4′ of the room 2 or the confined space corresponding to the greatest height beneath the ceiling, whereas the suction device 8 is arranged opposite the blowing device 7, towards, preferably against, a second side wall 4″ opposite to said first side wall 4′ corresponding to the smallest height beneath the ceiling.

According to a particular embodiment, several alternatives of which are illustrated in the figures, the blowing device 7 and the blowing device 8 are designed to be placed remote from each other, substantially parallel to each other and opposite to each other, in opposite areas of said room 2 or said confined space, for example at two opposite corners 6 of the latter, as illustrated in FIGS. 2 and 7, or at two opposite walls 4 of said room 2 or said confined space, as illustrated in FIG. 10.

According to a particular alternative, the suction device 8 comprises at least one suction pipe extending substantially in a longitudinal extension direction designed to be placed substantially vertically, said suction pipe being provided with said suction mouths 9, 10, 11. The suction device 8 can then comprise or be formed by said suction pipe, which is preferably positioned in said room 2 or said confined space, for example away from said side walls 4, or on the contrary against one or several (typically two) of said side walls 4. Said suction pipe is preferentially substantially elongated (in particular in said longitudinal extension direction). Said suction pipe has for example a length between 1 m and 7 m, preferably between 1.4 m and 6 m, more preferentially between 1.8 m and 5 m, even more preferentially between 2 m and 4 m.

Said suction pipe is for example in the form of a suction hollow column (or hollow pipe) along which are provided (possibly pierced) said suction mouths 9, 10, 11, said hollow column advantageously extending longitudinally along the longitudinal extension direction of said suction pipe. Said hollow column, according to a particular alternative of the invention and notwithstanding of said suction mouths 9, 10, 11, has a substantially cylindrical shape, preferably of circular, oval or elliptical basis, or according to another alternative of the invention, has a portion of cylinder cut lengthwise (i.e. in a direction parallel to the longitudinal extension direction of said suction pipe), said cylinder being preferably of circular, oval or elliptical basis.

According to another particular alternative, preferably combined with the preceding one but that can possibly be implemented independently, the blowing device 7 comprises at least one blowing pipe extending substantially in a longitudinal extension direction designed to be placed substantially vertically, said suction pipe being provided with said blowing mouths 12, 13, 14. The blowing device 7 can then comprise or be formed by said blowing pipe (as illustrated in FIGS. 7-8, for example), which is preferably positioned in said room 2 or said confined space, for example away from said side walls 4, or on the contrary against one or several (typically two) of said side walls 4. According to a particular alternative of the invention, the blowing device 7 can hence comprise or be formed by a vertical perforated blowing tube (for example, in metal or polymer), said perforations forming said blowing mouths 12, 13, 14. Said blowing pipe is preferentially substantially elongated (in particular in said longitudinal extension direction). Said blowing pipe has for example a length between 1 m and 7 m, preferably between 1.4 m and 6 m, more preferentially between 1.8 m and 5 m, even more preferentially between 2 m and 4 m.

Said blowing pipe is for example in the form of a blowing hollow column (or hollow pipe) along which area provided (possibly pierced) said blowing mouths 12, 13, 14, said hollow column advantageously extending longitudinally along the longitudinal extension direction of said blowing pipe. Said hollow column, according to a particular alternative of the invention and notwithstanding of said blowing mouths 12, 13, 14, has a substantially cylindrical shape, preferably of circular, oval or elliptical basis, or according to another alternative of the invention, has a portion of cylinder cut lengthwise (i.e. in a direction parallel to the longitudinal extension direction of said blowing pipe), said cylinder being preferably of circular, oval or elliptical basis.

Advantageously, said blowing pipe 7 has a cross-section that is substantially curved or at least partly curved, e.g. a substantially circular, elliptical or oval cross-section (i.e. with a closed figure), or also a cross-section with a circular-arc portion, an elliptical portion or an oval portion (i.e. with an open figure), or also a cross-section with at least a circular-arc portion, an elliptical portion or an oval portion (i.e. with an open or closed figure), as illustrated in the figures. Said cross-section (of the blowing pipe) is preferably defined by the intersection, on the one hand, of a plane substantially perpendicular to the longitudinal extension direction of the blowing pipe and, on the other hand, of the blowing pipe. Said plane is advantageously substantially horizontal.

Thus, according to an advantageous embodiment, the blowing pipe and/or the suction pipe (each) have at least a respective convexity. Said respective convexity is preferentially designed to be directed towards the outside, i.e. towards a space of the room 2 or the confined space into which the blowing pipe is designed to blow the gas, and/or from which the suction pipe is designed to draw out the gas. The blowing pipe and/or said suction pipe (each) have at least a respective concavity. Said respective concavity is preferentially designed to be directed towards the inside (or to form the inside) of the blowing pipe and/or the suction pipe, i.e. a space (of the blowing pipe and/or the suction pipe) designed, for the blowing pipe, to receive gas before the latter is blown into said room 2 or said confined space, for the suction pipe, to receive gas from said room 2 or said confined space.

Even more advantageously, said blowing mouths 12, 13, 14 are distributed over said blowing pipe 7 in order to provide the gas emitted therefrom with a radial distribution (with respect to the longitudinal extension direction of the blowing pipe), i.e. directing radially the gas exiting therefrom, advantageously to diffuse said gas within said room 2 or said confined space. In other words, the blowing mouths 12, 13, 14 are advantageously distributed over a surface curved towards the outside (of the pipe, i.e. curved from the inside of the pipe towards the room 2 or confined space out of the pipe) and vertically elongated to blow gas into the room 2 or the confined space along diverging, non parallel, flow directions, at said blowing mouths 12, 13, 14. This is advantageously the curved or partially curved nature of the blowing pipe 7 that will provide this radial distribution (or radial diffusion, or radial blowing), which makes it possible to very efficiently blow the gas within said room 2 or said confined space without occupying a significant volume and/or surface within said room 2 or said confined space, which of course limits the footprint and makes the ventilation system 1 easier to install. Several of said blowing mouths 12, 13, 14 are preferably distributed over the curved portion of said cross-section, along said curved portion, i.e. at different places of the latter in the plane of the cross-section (thus a plane advantageously perpendicular to the longitudinal extension direction), in order to perform said radial blowing. As a function of the configuration of the room 2 or the confined space to be ventilated and to the position of the ventilation system 1 within said room 2 or said configuration to be ventilated, said radial distribution can be performed circularly over 360° (in the case of a meshing as that of FIG. 6 for example), or over a smaller angular sector, e.g. of the order of 90° (quarter circle) when the blowing mouths 12 are arranged in a corner of the room (cf. FIG. 9) or of the order of 180° (half circle-cf. FIG. 10) when the blowing mouths 12 are arranged against a wall away from the corners (case of a wagon for example—cf. FIG. 13). In other words, according to this alternative, the blowing pipe 7 has advantageously a curvature, and the blowing mouths 12, 13, 14 are distributed along this curvature in groups at respective heights, in order to send gas in several radial directions relating to said curvature. Such a configuration makes it possible to send gas in all the areas of the room 2 or the confined space. Preferably, said radial distribution is defined along the longitudinal extension direction of said blowing pipe. Said radial distribution makes it possible in particular to destratify and homogenize more efficiently and rapidly the gas forming the atmosphere of the room 2 or the confined space, by blowing gas to all or almost all the areas of the room 2 or the confined space, which makes it possible to avoid the creation of “dead areas” in which the gas stagnates and is not renewed by the ventilation system 1.

Preferably, said suction pipe has a cross-section at which several of said suction mouths 9, 10, 11, are provided, wherein each suction mouth 9, 10, 11 can be passed through by a respective virtual line both inscribed in (the plane of) the cross-section and secant to the longitudinal extension direction of the suction pipe. Said virtual lines are advantageously secant (in particular, at said longitudinal extension direction). Said virtual lines preferably diverge towards the outside of said suction pipe.

Advantageously, the blowing device 7 comprises a wall forming said blowing pipe, with holes distributed over the height of said wall and passing through the latter to form said blowing mouths 12, 13, 14. Said wall is preferably au least partly curved in the plane perpendicular to the longitudinal extension direction of the blowing pipe, the curved portion of said wall advantageously carrying said blowing mouths 12, 13, 14. For example, said wall includes a sheet metal plate perforated to form said holes, or a textile or fibrous panel (preferably woven or possibly non-woven), the interstices between the threads or fibres of which form said holes, or also a panel made of a porous material, the pores of which are pass-through to form said holes. Said wall can for example be in the form of a cylindrical column, preferably of circular (or elliptical or oval) basis, as for example a tube, which is arranged vertically and whose side wall can for example be perforated with a distribution of holes covering the height and the periphery of the column, over an angular sector adapted to the position of the blowing device 7 within the room or the confined space. Advantageously, said holes forming the blowing mouths 12, 13, 14 are arranged over an angular sector that covers as much as possible the room 2 or the confined space to be ventilated, as a function of the positioning of the blowing device 7. Therefore, in the case of a meshing as that of FIG. 6 for example, the holes can be distributed circularly over 360°. The holes can be distributed over a smaller angular sector, e.g. of the order of 90° (quarter circle) when the blowing mouths 12 are arranged in a corner of the room (cf. FIG. 9) or of the order of 180° (half circle) when the blowing mouths 12 are arranged against a wall away from the corners (cf. FIG. 9, and case of a wagon for example, cf. FIG. 13).

In the case in which the blowing device 7 is formed by a vertical column, it is preferable that the surface through which the air is injected faces the area of the room to be supplied, and that the flow distribution is homogeneous across the blowing surface. It is also preferable that the homogeneity of the flow injected is made with a minimum of mixture with the air of the room, so that the implementation of a wall made of fabric, porous material or perforated metal sheet with the smallest possible openings is favoured. This makes it possible to blow the gas into the confined volume to be ventilated through holes of very small size, homogeneously and continuously distributed over the whole surface of the vertical column that faces the volume to be ventilated, in order to efficiently sweep the latter with a gaseous flow, preferably over the whole height thereof.

Preferably, said blowing pipe 8 has a cross-section that is substantially curved or at least partly curved, e.g. substantially a circular, elliptical or oval cross-section (i.e. with a closed figure), or also a cross-section with a circular-arc portion, an elliptical portion or an oval portion (i.e. with an open figure), or also a cross-section with at least a circular-arc portion, an elliptical portion or an oval portion (i.e. with an open or closed figure), as illustrated in particular in FIGS. 2 and 7. Said cross-section (of the suction pipe) is preferably defined by the intersection, on the one hand, of a plane substantially perpendicular to the longitudinal extension direction of the suction pipe and, on the other hand, of the suction pipe. Said plane is advantageously substantially horizontal.

More preferentially, said suction mouths 9, 10, 11 are distributed over said suction pipe in order to provide a radial suction (with respect to the longitudinal extension direction of the suction pipe) to the gas from the room 2 or the confined space. In other words, the suction mouths 9, 10, 11 are advantageously distributed over a surface curved towards the outside (of the pipe, i.e. curved from the inside of the pipe towards the room 2 or confined space out of the pipe) and vertically elongated to draw out the gas from the room 2 or the confined space along converging, non parallel, flow directions, at said suction mouths 9, 10, 11. This is advantageously the curved or at least partially curved nature of the suction pipe that will provide this radial suction, which makes it possible to very efficiently draw out the gas from said room 2 or said confined space without occupying a significant volume and/or surface within said room 2 or said confined space, which of course limits the footprint and makes the ventilation system 1 easier to install. The suction mouths 9, 10, 11 are preferably distributed over the curved portion of said cross-section, along said curved portion, i.e. at different places of the latter in the plane of the cross-section (thus a plane advantageously perpendicular to the longitudinal extension direction), in order to perform said radial suction. Here again, as a function of the configuration of the room 2 or the confined space to be ventilated and the position of the ventilation system 1 within said room 2 and said confined space to be ventilated, said radial distribution can be made over 360°, or only over a smaller angular sector. In other words, according to this alternative, the suction pipe has advantageously a curvature, and the suction mouths 9, 10, 11 are distributed along this curvature in groups at respective heights, in order to draw out gas from the room 2 or the confined space in several radial directions relating to said curvature. Said blowing 7 and suction 8 pipes can be similar, as illustrated in particular in FIGS. 2 and 13, for the sake of simplification and/or limitation of the manufacturing costs, or different, as illustrated in particular in FIGS. 9 and 10, due for example to the configuration of the room 2 or the confined space or the gas flow requirement. The blowing pipe 7 and/or the suction pipe 8 can thus have a respective cross-section that is closed (with a closed figure), e.g. circular with an entire circle, or open (with an open figure), e.g. an arc or semi-circle. The open cross-section pipe is advantageously designed to be applied against at least one of the side walls 4, as illustrated in FIGS. 9 and 10 for the blowing pipe of the blowing device 7. Preferably, said radial suction is defined along the longitudinal extension direction of said suction pipe. Said radial suction makes it possible in particular to destratify and homogenize more efficiently and rapidly the gas forming the atmosphere of the room 2 or the confined space, by drawing out gas from all or most of the areas of the room 2 or the confined space, which makes it possible to avoid the creation of “dead areas” in which the gas stagnates and is not renewed by the ventilation system 1.

According to an advantageous embodiment, the ventilation system 1 comprises at least one substantially elongated gas distribution device 15, 16, designed to be positioned vertically in order to delimit a space 17, which is designed to receive said blowing device 7. Said gas distribution device 15, 16 preferably has a plurality of holes, which are more preferentially (but not necessarily) distributed on a substantially regular basis, along at least half its length, preferably distributed along all or most of its length. Advantageously, the gas distribution device 15, 16 has the same size (i.e. the same length, to within 5%) as the blowing device 7. The distribution device 15 advantageously forms a screen pieced with said holes between the blowing device 7 and the remaining of the room 2 or the confined space, for a better distribution of the gas flow exiting from said blowing device 7 into said room 2 or said confined space. Said gas distribution device 15, 16 is in particular placed opposite the blowing device 7, close to the latter (a few cm therefrom, e.g. between 1 and 30 cm, more preferentially between 2 and 20 cm), and preferably along said blowing device 7.

For example, the distribution device 15, 16 comprises a substantially rigid grid or plate 15, provided with at least part of said holes. Said grid or plate 15 is in particular placed opposite the blowing device 7, close to the latter (a few cm therefrom, e.g. between 1 and 20 cm), and preferably along said blowing device 7. Such an embodiment is illustrated in particular in FIGS. 4 and 5, which are enlarged views of embodiment details of one part of the ventilation system 1 at a corner 6 of the room 2 (or the confined space) in which are positioned the blowing device 7 and the distribution device 15, 16.

According to another example, which may be applied alone or in combination with the preceding one, the distribution device 15, 16 comprises a substantially flexible and not gas-tight fabric 16, the fabric 16 having threads and spaces between the threads, the spaces between said threads forming at least part of said holes. Such an embodiment is illustrated in particular in FIG. 5. The grid or plate 15 is rigid and thus advantageously has a proper mechanical strength, whereas the fabric 16 is flexible and has thus no proper mechanical strength.

According to a particular embodiment, illustrated in particular in FIGS. 4, 5, 7 and 8, said distribution device 15, 16 is designed to be applied against and/or hung on at least one of said side walls 4 to delimit said space 17. The ventilation device 1 can comprise connecting joints 22 for connecting, e.g. by gluing, screwing or any other means, the distribution device 15, 16 to said at least one wall 4. For example, the distribution device 15, 16 is designed to be applied against and/or hung on only one of said side walls 4, as illustrated in FIG. 12, or two side walls 4, advantageously separated from each other by said corners 6, as illustrated in FIGS. 4, 5 and 9. In this latter case, the blowing device 7 and the distribution device 15, 16 are preferably designed to be positioned in a same corner 6 of said room 2 or said confined space.

The use of a distribution device 15, 16 separate and distant from the blowing device 7 is purely optional. In particular, it is possible to dispense with such a distribution device when using as a blowing device a woven or non-woven textile wall that itself defines the blowing mouths 12, 13, 14.

According to a particular embodiment, said blowing device 7 and/or said suction device 8 is/are each designed to be positioned in a respective corner 6 of said room 2 or said confined space. Said two corners 6 are preferably opposite each other and preferably do not share a common side wall 4.

In one particular embodiment, it is quite possible that the ventilation system 1 of the invention comprises several blowing devices 7 and several suction devices 8, as illustrated in FIGS. 6, 9, 12 and 13. For example, the ventilation system 1 comprises two blowing devices 7 and two suction devices 8, each designed to be positioned in a respective corner 6 of the room 2 or the confined space, the two blowing devices 7 being for example positioned on one side of the room 2 or the confined space, whereas the two suction devices 8 are positioned on the other side of the room 2 or the confined space. The ventilation system 1 can also comprise a greater number of blowing devices 7 and suction devices 8, for example to ventilate a very large room 2, the ventilation system 1 then comprising several pairs each formed of a blowing device 7 and a suction device 8 positioned, for example vertically, at a certain distance from each other, each pair being also at a certain distance from the neighbour pairs, as illustrated in FIGS. 6 and 13.

According to a particular embodiment, said distribution device 15, 16 has a cross-section with a concavity delimiting said space 17 and turned towards said blowing device 7. Such a configuration makes it possible to improve the radial distribution of the gas within the room 2 or the confined space, from the blowing device 7.

For example, the grid or plate 15 is substantially flat, i.e. it extends in a plane, as illustrated in FIG. 4. According to another example, the grid or plate 15 is substantially curved, for example in the shape of an arc of circle, as illustrated in FIG. 5. The grid or plate 15 can thus, in this latter case, have the same curvature profile as the blowing pipe of the blowing device 7. The fabric 16 can be designed to have said concavity when the blowing device 7 operates, said fabric 16 being thus inflated thanks to the latter.

Advantageously, the ventilation system 1 further comprises at least a first gas circulation means 18, designed to circulate gas within the blowing device 7 up to the room 2 or the confined space, and a second gas circulation means (here, the same as the first means 18) designed to circulate gas from the room 2 or the confined space up to the suction device 8. In the examples illustrated in the figures, said first and second gas circulation means 18 are merged, but they can also be independent from each other. Each gas circulation means 18 comprises for example a fan, or any other means of moving the gas. Said second gas circulation means is thus advantageously formed by said first circulation means 18.

Said blowing device 7 is preferentially designed to “actively” blow gas into said room 2 or said confined space, advantageously using the first gas circulation means 18. Said blowing device 7 is thus advantageously designed to force the sending of the gas into said room 2 or said confined space, preferably thanks to the first gas circulation means 18. Of course, it is possible to consider, according to a particular alternative, that said first gas circulation means 18 belongs to said blowing device 7. Likewise, the suction device 8 is preferentially designed to “actively” draw out the gas from said room 2 or said confined space, advantageously using the second gas circulation means (which may thus be merged with the first gas circulation means 18, or separate from the latter).

Said suction device 8 is thus advantageously designed to force the gas to be drawn out from said room 2 or said confined space, preferably thanks to the second gas circulation means. Of course, it is possible to consider, according to a particular alternative, that said second gas circulation means belongs to said blowing device 8.

According to a particular embodiment, an example of which is illustrated in FIG. 12, the ventilation system 1 further comprises an automatic control unit (not visible in FIG. 12 or merged with the sensor 23) and one or several sensors 23 to be placed in said room 2 or said confined space, e.g. one or several temperature sensors, for a gaseous compound (such as carbon monoxide CO, hydrogen sulphide H₂S, nitrogen, carbon dioxide CO₂, etc.) or humidity, said sensor(s) 23 being designed to send information to said control unit, in such a way that the latter automatically adjusts a gas flow circulated by said one or several gas circulation means 18 within said blowing 7 and/or suction 8 device(s). The ventilation system 1 thus advantageously comprises a loop for regulating a parameter of the gaseous atmosphere of the room 2 or the confined space, said regulation loop comprising at least the automatic control unit and said sensor(s) 23, as illustrated in FIG. 12. For example, the ventilation system 1 is automatically regulated according to temperature and/or hydrometry, which enables for example to save heating energy, such savings being favoured by the air destratification and homogenization in the room 2 (or the confined space) advantageously obtained thanks to the ventilation system 1. Said sensor(s) 23 are optionally designed to be placed at different heights of said room 2 or said confined space (when there is only one sensor 23, the latter extends for example vertically in order to be able to take measurements at different heights). Such a configuration enables in particular an accurate control of the renewal and/or treatment of the different strata of gas in said room 2 or said confined space. As another alternative (or in combination with what precedes), said sensor(s) 23 can be placed or designed to be placed at a same height of the room 2 or the confined space, for example on the floor, and can further (whatever their height) be placed at different places of the room 2 or the confined space in the horizontal plane (when there is only one sensor 23, the latter extends for example horizontally in order to be able to perform measurements at different places of the room 2 or of the confined space in the horizontal plane).

According to a particular embodiment, said sensor(s) 23 are (designed to be) positioned in the suction device 8 (and more precisely in the suction pipe). According to another particular embodiment, said sensor(s) 23 are positioned in the ventilation system 1 downstream from said suction device 8, for example in the intermediate pipe 19 and/or in one or several of the gas vents 27 (described hereinafter). Thus, said sensor(s) 23 can be positioned within or downstream from the suction device 8. Such a configuration guaranteeing the analysis over most or all of the gas flow extracted from the room 2 or the confined space, and not only at a sensor placed in the room 2 or the confined space, independently of the suction device 8 (and in particular out of the latter or not downstream from the latter).

Advantageously, the gas circulation means 18 can operate in a continuous mode regulated from data provided by the sensor(s) installed in the closed volume (the room 2 or the confined space) to be ventilated. It is also possible that the gas circulation means 18 can operate temporarily, for a controlled duration, in a forced operation mode involving gas circulation at maximum flow rate to renew the air and/or purify the air and/or reduce the content of a gaseous compound (for example, the carbon monoxide CO, hydrogen sulphide H₂S, nitrogen, carbon dioxide CO₂, etc.) of the air in the room 2 or the confined space in question (for example, a classroom, a theatre or also a train compartment) for a short time (for example, break time, intermission, time or break between classes, station stop or cleaning time).

Preferentially, the ventilation system 1 further comprises an intermediate pipe 19 connecting said blowing 7 and suction 8 devices to each other, in such a way that the gas in the room 2 or the confined space is drawn out by said suction device 8 then sent back at least in part to said blowing device 7 via said intermediate pipe 19. According to a particular embodiment, said intermediate pipe 19 forms with said blowing 7 and suction 8 devices an independent sub-unit intended to be added in a building (or a mobile or immobile structure) to fit a room or a ventilated space to be ventilated. In this case, said intermediate pipe 19 optionally includes an integrated air treatment device, in order to implement an in situ air treatment. As an alternative, said intermediate pipe 19 is formed at least in part by an aeraulic circuit already installed in the building (or the mobile or immobile structure) the room or confined space to be ventilated belongs to, said aeraulic circuit being for example part of a controlled mechanical ventilation (CMV) or air treatment system to which said blowing 7 and suction 8 devices are in this case designed to be connected, in which case an ex situ air treatment can be implemented.

According to a particular embodiment, the ventilation system 1 comprises, upstream from said blowing device 7, a gas treatment means 20. Optionally, the latter is downstream from the suction device 8, in particular when the ventilation system 1 comprises said intermediate pipe 19. The latter is then advantageously connected to the treatment means 20, and/or the latter forms a part of said intermediate pipe 19.

For example, the gas treatment means 20 comprises at least one or several of the following elements:

- a gas pollution control, decontamination and/or deodorization means, for example a particle filter, an anti-virus filter and/or an antibacterial filter, such as a UV filter, or also a carbon filter,
- a gas physical parameter regulation means, for example a hydrometry regulation means and/or a gas temperature regulation means, such as a gas heating and/or cooling means, or also a dehumidifier, and/or
- a gas homogenization means, for example a mixer.

According to a alternative that can be implemented alone or in combination with what precedes, the blowing device 7 and the suction device 8 are designed to respectively collect and eject gas out of said room 2 or said confined space (and preferably out of the ventilation system 1), for example air coming from the outside (in particular, of a building or a vehicle). The outside is preferably located out of the room 2 or the confined space and out of the ventilation system 1. The ventilation system 1 then advantageously comprises one or several gas intakes 26 for collecting gas from the outside to the blowing device 11, and one or several gas vents 27 for ejecting gas from the suction device 8 to the outside. Said gas treatment means 20 can be designed to treat the gas coming from outside said room 2 and said confined space. Said intermediate pipe 19 can then possibly be connected to said or at least one of said gas intake(s) 26 (as illustrated in FIG. 12, at the bottom right) and/or to said or at least one of said gas vent(s) 27. Therefore, the gas coming from the blowing device 7 may come entirely from the gas drawn by the suction device 8, or it may come entirely from outside said room 2 or said confined space and not from the suction device 8 that then rejects all the gas out of the room 2 or the confined space, or it may also come in part from the suction device 8 and in part from outside said room 2 or said confined space without passing first through said suction device 8.

According to an alternative of the invention, alone or in combination with the preceding and the following ones, the suction device 8 is designed to be arranged away from the walls 4 of the room 2 or the confined space, for example more than one metre away from each wall 4. It may then advantageously extend from the floor 5 to the ceiling 3, without contact with one of the walls 4. In a particular embodiment of the invention, the suction device 8 is placed at the centre of the room 2 or the confined space.

The invention also relates, according to a fourth aspect, to a method for ventilating a room 2 or a confined space having a ceiling 3, this method being preferably designed to be implemented by means of the above-mentioned ventilation system 1. Preferentially, the above description relating to the ventilation system 1 thus also applies to the ventilation method, and the reverse.

According to the invention, the method comprises at least:

- a step of blowing a gas into said room 2 or said confined space, and
- a step of drawing out the gas contained in said room 2 or said confined space,
  
  the suction step being performed via a plurality of suction mouths 9, 10, 11 of a suction device 8 (preferably, that which is mentioned hereinabove), the suction mouths 9, 10, 11 being distributed one below the other in a substantially vertical direction, said suction mouths 9, 10, 11 comprising at least one upper suction mouth 9 and one lower suction mouth 10, as well as intermediate suction mouths 11 located between said upper 9 and lower 10 suction mouths, the distance between said upper 9 and lower 10 suction mouths being greater than at least half the height beneath the ceiling 3 of said room 2 or said confined space.

Of course, said blowing step is preferably performed using said blowing device 7 and said suction step is advantageously performed using said suction device 8.

The ventilation method advantageously comprises, before (and upstream from) said blowing step, a gas treatment step, preferably using the gas treatment means 20, the gas treatment step preferably occurring after (or downstream from) the suction step.

The blowing step is performed via a plurality of blowing mouths 12, 13, 14 of a blowing device 7 (preferably, that mentioned hereinabove). The blowing mouths 12, 13, 14 preferably comprise at least one upper blowing mouth 12 and one lower blowing mouth 13, as well as intermediate blowing mouths 14 located between said upper 12 and lower 13 blowing mouths, the distance between said upper 12 and lower 13 blowing mouths being greater than at least half the height beneath the ceiling 3 of said room 2 or said confined space.

The suction device 8 comprises at least one suction pipe extending substantially in a longitudinal extension direction designed to be placed substantially vertically, said suction pipe being provided with said suction mouths 9, 10, 11. The blowing device 7 comprises at least one blowing pipe extending substantially in a longitudinal extension direction designed to be placed substantially vertically, said blowing pipe being provided with said blowing mouths 12, 13, 14. Said suction pipe 8 and/or said blowing pipe 7 has a (respective) cross-section substantially curved or at least partly curved. Said suction mouths 9, 10, 11 are distributed over said suction pipe in such a way as to provide a radial suction of the gas in the room 2 or the confined space and/or said blowing mouths 12, 13, 14 are distributed over said blowing pipe in such a way as to provide the gas emitted therefrom with a radial distribution (within the room 2 or the confined space).

The ventilation system 1 of the invention allows a faster and more complete renewal of the gas contained in a room 2 or a confined space, which may be particularly useful in the context of a surgical operation, for example, in order to reduce the risks of contamination, or in a more general context, in particular a classroom, a living room, an office, an open-space, a meeting room, a commercial room (store), a cinema or a theatre, a cistern, a silo, a bunker, a tank, a train car, or an aircraft cabin (or any other suitable closed volume).

The ventilation system 1 of the invention is therefore particularly suited to the problem of ventilating a room 2 or a confined space, which encompasses health safety issues linked to micro-organism contamination (pandemics, hospital contamination, etc.), pollution (fine particles, etc.), the physical safety of goods and living beings, the general well-being of people (air conditioning, heating, etc.), and energy optimization.

POSSIBILITIES OF INDUSTRIAL APPLICATION

The invention finds industrial application in the design, manufacturing, and implementation of ventilation systems.

VENTILATION SYSTEM, ROOM, CONFINED SPACE AND BUILDING EQUIPPED WITH SUCH A SYSTEM, AND ASSOCIATED METHOD

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