CEILING STRUCTURE AND FACILITY COMPRISING SUCH A CEILING STRUCTURE COMPRISING AIR STERILISATION MEANS

Abstract

The present disclosure relates to a false ceiling and an installation comprising such a structure for feeding treated air into a room, comprising a ceiling wall, a false wall positioned on the underside of, and at a distance from, all or a portion of the ceiling wall and defining, with the ceiling wall or a portion of the ceiling wall, an airflow corridor that is referred to as a plenum and comprises an air outlet opening inside the room provided in the false wall, characterized in that the false ceiling comprises lighting means comprising a plurality of light sources that are capable of emitting ultraviolet light and arranged in the airflow corridor so as to sterilize the air flowing in the corridor before it passes through the air outlet slot.

Claims

1. A sterilization system for sterilizing a room, comprising: a false ceiling for supplying treated or not treated air in the room to be sterilized; at least one protective tensioned fabric, blocking UVC, the at least one protective tensioned fabric positioned on the underside and at a distance from the ceiling of the room to be sterilized, being fixed to the side walls of the room and arranged with an upper slab of the ceiling in order to delimit a so-called plenum space; at least one means for attaching the at least one protective tensioned fabric to the side walls of the room by means of at least one peripheral attachment profile comprising an air outlet slot opening onto at least one side wall of the room and allowing the passage of the air circulating between the plenum and the room to be sterilized; —at least one ventilation and/or air-conditioning means connected to the plenum via at least one air inlet air venting duct in the plenum, the blown air forming a horizontal unidirectional air circulation corridor over the entire length of the plenum; —an air return box able to be connected to ventilation and/or air conditioning means, as well as air suction openings located opposite the air outlet slot and allowing air to pass from inside the room to the air return box; and several UVC light sources arranged in the plenum over the entire length of the horizontal unidirectional air circulation corridor so as to sterilize the air flowing in the air circulation corridor before it passes through the air outlet slot, wherein a distance between the plurality of UVC light sources and the ceiling on the one hand and a distance between the plurality of UVC light sources and the at least one tensioned protective fabric on the other hand is at most 25 cm, and wherein the walls of the plenum have means of reflection of ultraviolet light emitted by the UVC light sources.

2. The system of claim 1, wherein the false ceiling further comprises at least one tensioned finishing fabric, the tensioned finishing fabric, visible from the room, being fixed to the side walls of the room by means of the at least one peripheral attachment profile comprising an air outlet slot opening onto at least one side wall of the room and allowing the passage of the air circulating between the plenum and the room to be sterilized.

3. The system of claim 1, wherein a height of the plenum is at most 50 cm.

4. The system of claim 3, wherein the height of the plenum is at least 10 cm.

5. The system of claim 1, wherein the plurality of UVC light sources are arranged at mid-height of the plenum.

6. The system of claim 1, wherein the UVC light sources are arranged in the form of lines of light lamps that are spaced apart over an entire length of the plenum.

7. The system of claim 6, wherein the lines of light lamps are continuous or discontinuous lines.

8. The system of claim 7, wherein, wherein the lines of light lamps comprise staggered rows of discontinuous lines.

9. The system of claim 6, wherein a space between two adjacent lines of light lamps is between 25 cm and 200 cm.

10. The system of claim 9, wherein the space between the two adjacent lines of light lamps is between 50 cm and 100 cm.

11. wherein the air of the room to be sterilized has a disinfection coefficient of 99.9% of the viruses and bacteria when the ventilation and/or air conditioning means is activated for at most 30 minutes and this independently of the number of occupants in the room to be sterilized.

12. The system of claim 1, wherein the air of the room to be sterilized has a disinfection coefficient of 99.9% of the viruses and bacteria when the ventilation and/or air conditioning means is activated for at least 8 minutes and this independently of the number of occupants in the room to be sterilized.

13. (canceled)

14. The system of claim 1, wherein a face of the protective tensioned fabric facing onto the plenum has a UVC reflection coefficient of greater than or equal to 80%.

15. The system of claim 2, wherein the protective tensioned fabric and the finishing fabric each have a thickness of less than 5 mm.

16. The system of claim 1, wherein a suction channel is defined by a separation partition integral with the peripheral attachment profile.

17. An installation for supplying treated air to a room to be sterilized, comprising: the system according to claim 1; an air inlet in the plenum, an air outlet slot of the false wall being arranged at the opposite end of the air inlet, and ventilation and/or air conditioning means connected to the air inlet in order to form a horizontal unidirectional air circulation corridor of the plenum; wherein the walls of the plenum include means for reflecting ultraviolet light emitted by a plurality of UVC light sources.

18. The installation according to claim 17, wherein the ventilation and/or air conditioning means are connected to the air return box.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Other features and advantages of the present disclosure will emerge from the following detailed description of the present disclosure with reference to the appended figures, and in which:

[0040] FIG. 1 represents a cross section of a false ceiling structure allowing the circulation of ambient air processed within a premises according to an exemplary embodiment of the present disclosure for which the light sources are installed against the ceiling of the part.

[0041] FIG. 2 represents a cross section of a false ceiling structure allowing the circulation of ambient air processed within a premises according to another embodiment of the present disclosure for which the light sources are installed at mid-height of the plenum.

[0042] FIG. 3 represents a top view, namely from the ceiling of a false ceiling structure allowing the circulation of an ambient air processed within a premises according to another embodiment of the present disclosure for which the light sources are installed in continuous or discontinuous lines.

[0043] FIG. 4 represents a top view, namely from the ceiling of a false ceiling structure allowing the circulation of ambient air processed within a premises according to another embodiment of the present disclosure for which the light sources are installed in discontinuous lines and where two lines of discontinuous light lamps are adjoining the arrangement of their UVC light sources is arranged in staggered rows.

[0044] FIG. 5 represents a horizontal section resulting from the result of the numerical simulations.

[0045] FIG. 6 represents the impact of the height of the plenum (4) on the disinfection quality.

[0046] FIG. 7 represents the degree of disinfection as percentage of the interior air of the room or local to be treated as a function of the operating time of the light sources.

DETAILED DESCRIPTION

[0047] Although methods and materials similar or equivalent to those described herein may be used in practice, suitable methods and materials are described below. All publications, patent applications, patents and other references mentioned herein are incorporated by reference in their entirety. In addition, the materials, methods and embodiments described are merely illustrative and are not intended to be limiting.

[0048] In the event of conflict, the present description, including definitions, will prevail.

[0049] Unless otherwise defined, all technical and scientific terms used in the present document have the same meaning as generally understood by the person skilled in the art to whom the subject belongs. As used herein, the following definitions are provided to facilitate understanding of the present disclosure.

[0050] The term “comprise or comprises” is generally used in the sense of including, that is to say, to allow the presence of one or more characteristics or components.

[0051] As used in the description and claims, the singular forms “a” and “the” include plural references, unless otherwise indicated.

[0052] The term “treated air” means cooled or reheated air (so as to ensure the cooling or heating requirements of a room) and provided with an external new air supply so as to ensure the ventilation of hygienic air of the room.

[0053] As a general rule, “cold air” is understood to mean a temperature ranging up to 20° C. and “hot air” any temperature above 20° C.

[0054] The present disclosure proposes to provide a false ceiling (1) making it possible to supply or not treated air in a room to be sterilized, comprising: [0055] at least one protective tensioned fabric (8), blocking UVC, the protective tensioned fabric (8) positioned on the underside and at a distance from the ceiling (3) of the room to be sterilized, being fixed to the side walls of the room and arranged with an upper slab of the ceiling (3) in order to delimit a so-called plenum (4) space, [0056] at least one means for attaching the at least one protective tensioned fabric (8) to the side walls of the room by means of at least one peripheral attachment profile (12) comprising an air outlet slot (5) opening onto at least one side wall of the room and allowing the passage of the air circulating between the plenum (4) and the room to be sterilized, [0057] at least one ventilation and/or air-conditioning means (10) connected to the plenum (4) via at least one air inlet air venting duct (9) in the plenum (4), the blown air forming a horizontal unidirectional air circulation corridor over the entire length of the plenum (4), [0058] an air return box (15) able to be connected to ventilation and/or air conditioning means (10), as well as air suction openings (14) located opposite the air outlet slot (5) and allowing air to pass from inside the room to the air return box (15), [0059] and where the false ceiling (1) includes a plurality of UVC light sources (6) arranged in the plenum (4) over the entire length of the horizontal unidirectional air circulation chute so as to sterilize the air flowing in the air circulation corridor before it passes through the air outlet slot (5) and where the distance between the plurality of UVC light sources (6) and the ceiling (3) on the one hand and the distance between the plurality of UVC light sources (6) and the at least one tensioned protective fabric (8) on the other hand is at most 25 cm.

[0060] Preferably, the false ceiling (1) according to the present disclosure further comprises at least one tensioned finishing fabric (2), the tensioned finishing fabric (2), visible from the room, being fixed to the side walls of the room by means of at least one peripheral attachment profile (12) comprising an air outlet slot (5) opening onto at least one side wall of the room and allowing the passage of the air circulating between the plenum (4) and the room to be sterilized.

[0061] Thus, according to a preferred embodiment, the present disclosure proposes to provide a false ceiling (1) making it possible to supply or not treated air in a room to be sterilized, comprising: [0062] at least one protective tensioned fabric (8), blocking UVC, the protective tensioned fabric (8) positioned on the underside and at a distance from the ceiling (3) of the room to be sterilized, being fixed to the side walls of the room and arranged with an upper slab of the ceiling (3) in order to delimit a so-called plenum (4) space, [0063] at least one tensioned finishing fabric (2), the tensioned fabric (2), visible from the room, being fixed to the side walls of the room, [0064] at least one means for attaching the at least one protective tensioned fabric (8) and the at least one tensioned finishing fabric (2) to the side walls of the room by means of at least one peripheral attachment profile (12) comprising an air outlet slot (5) opening onto at least one side wall of the room and allowing the passage of the air circulating between the plenum (4) and the room to be sterilized, [0065] at least one ventilation and/or air-conditioning means (10) connected to the plenum (4) via at least one air inlet air venting duct (9) in the plenum (4), the blown air forming a horizontal unidirectional air circulation corridor over the entire length of the plenum (4), [0066] an air return box (15) able to be connected to ventilation and/or air conditioning means (10), as well as air suction openings (14) located opposite the air outlet slot (5) and allowing air to pass from inside the room to the air return box (15), [0067] and where the false ceiling (1) includes a plurality of UVC light sources (6) arranged in the plenum (4) over the entire length of the horizontal unidirectional air circulation chute so as to sterilize the air flowing in the air circulation corridor before it passes through the air outlet slot (5) and where the distance between the plurality of UVC light sources (6) and the ceiling (3) on the one hand and the distance between the plurality of UVC light sources (6) and the at least one tensioned protective fabric (8) on the other hand is at most 25 cm.

[0068] Preferably, the height of the plenum (4) is at most 50 cm.

[0069] According to a particular embodiment, the height of the plenum (4) is at least 10 cm.

[0070] Advantageously, the plurality of UVC light sources (6) is arranged at mid-height of the plenum (4).

[0071] According to an embodiment, the plurality of UVC light sources (6) is arranged in the form of lines of light lamps (13) that are spaced apart over the entire length of the plenum (4).

[0072] According to another embodiment of the present disclosure, the lines of light lamps (13) are continuous or discontinuous lines (see FIG. 3).

[0073] Preferably, in the case where two discontinuous lines of light lamps (13) are adjoining the arrangement of their UVC light sources (6) is arranged in staggered rows (see FIG. 4). The term “staggered” is understood to mean that the UVC light sources (6) of two lines of neighboring light lamps (13) alternate in two rows.

[0074] Advantageously, the space between two lines of light lamps (13) is between 25 cm and 200 cm.

[0075] Preferably, the space between two lines of light lamps (13) is between 50 cm and 100 cm.

[0076] Surprisingly, it has been demonstrated that the air of the room to be sterilized has a disinfection coefficient of 99.9% of the viruses and bacteria when the ventilation and/or air conditioning means (10) is activated for at most 30 minutes and this independently of the number of occupants in the room to be sterilized.

[0077] Furthermore, it has also been demonstrated that the air of the room to be sterilized has a disinfection coefficient of 99.9% of the viruses and bacteria when the ventilation and/or air conditioning means (10) is activated for at least 8 minutes and this independently of the number of occupants in the room to be sterilized.

[0078] Preferably, the walls of the plenum (4) comprise means for reflecting ultraviolet light emitted by the plurality of UVC light sources (6).

[0079] According to a preferred embodiment of the present disclosure, the face of the protective tensioned fabric (8) facing the plenum (4) has a reflection coefficient for UVC greater than or equal to 80%.

[0080] Advantageously, the protective tensioned fabric (8) and the finishing fabric (2) have a thickness of less than 5 mm.

[0081] According to another embodiment, the suction channel (15) is formed by a separation partition (7) integral with the peripheral attachment profile (12).

[0082] The present disclosure also proposes to provide an installation allowing air treated in a room to be sterilized, comprising: [0083] a false ceiling (1) according to the present disclosure, [0084] an air inlet (9) in the plenum (4), the air outlet slot (5) of the false wall being arranged at the opposite end of the air inlet (9), and [0085] ventilation and/or air conditioning means (10) connected to the air inlet (9) in order to form a horizontal unidirectional air circulation corridor (4).

[0086] Advantageously, the ventilation and/or air conditioning means (10) are connected to the air return box (15).

[0087] In relation to FIG. 1, a ceiling or false ceiling structure (1) is described that makes it possible to supply treated air (11) within a room. In the present disclosure, the treatment relates to the sterilization of air.

[0088] The false ceiling (1) comprises, in the shown example, a protective tensioned fabric (8), positioned on the underside of the ceiling wall (3). The protective tensioned fabric (8) extends between the walls of the room to be sterilized and is fixed to these walls by means of attachment profiles (12) (also called smooth). In the following, the false sheet wall is designated by first protective fabric (8) in order to simplify the reading of the present description.

[0089] The first tensioned fabric (8) forms a fabric that can be visible from inside the room. It is arranged so as to delimit, with the ceiling wall (3), an air circulation corridor (4) (also called plenum).

[0090] The false ceiling (1) comprises an air inlet or aeraulic ventilation (9) in the air circulation corridor or plenum (4) and an air outlet opening or slot (5) inside the room to be treated. A ventilation and/or air conditioning system (10), connected to the air inlet duct (9), makes it possible to ensure throughout the volume of the air circulation corridor (4), a laminar air flow between the air inlet (9) and the air outlet slot (5). The air outlet opening (5) is arranged in the peripheral attachment profile (12), the latter forming a profiled element referred to as air supply. Application WO 2018/037184 describes an example of such a profile that can be implemented with the false ceiling structure (1) according to the object of the present disclosure.

[0091] According to the present disclosure, the false ceiling (1) comprises a plurality of light means (6) that are, in the example shown, fixed to the ceiling slab or wall (3) or suspended in the plenum (4).

[0092] In the embodiment shown, the plurality of light means (6) comprise UVC light sources (6) distributed on the ceiling wall (3) or suspended from the ceiling wall (3), and able to emit ultraviolet light. Preferentially, these UVC light sources (6) are lamps, for example, light-emitting diodes, of UVC type. These sources, having a germicidal function, thus allow the air to be sterilized when it passes through the air circulation corridor (4).

[0093] The first protective fabric (8) is treated with, for example, a composition making it possible to prevent the passage of UVCs. It thus protects the persons present in the premises by blocking UVCs.

[0094] Advantageously, a deflector (16) is positioned in line with or at the air outlet slot (5) so as to prevent any passage of the UVCs by the latter and thus ensure perfect protection of the occupants of the premises.

[0095] Advantageously, the false ceiling (1) comprises means blocking ultraviolet light emitted by the UVC light sources (6), in order to form a protective screen of the tensioned protective fabric (8). This protective screen is made in the example shown by an additional tensioned finishing fabric (2) (designated as second tensioned fabric 2) visible from the room and arranged below the first tensioned fabric (8). As shown, the second tensioned fabric (2) is arranged at a distance from the first tensioned fabric (8) and is visible from the premises. In the case where the false ceiling (1) comprises such a finishing fabric (2), the air inlet opens into the air circulation corridor (4), between the first tensioned fabric (8) and the ceiling wall (3). Of course, an air inlet is provided in the space delimited by the second tensioned fabric (2) and the first tensioned fabric (8). In this case, light sources may be provided on the wall in which the air inlet is arranged and on the wall near the air outlet slot (5) inside the room. As before, the air outlet openings (5) are provided both for the first tensioned fabric (8) and for the second tensioned fabric (2), at the smooth profiles (12) on which the two tensioned fabrics are fixed. The presence of the second tensioned fabric (2) is, of course, optional, and a false ceiling (1) without an additional fabric (2) can be provided. Likewise, a false ceiling (1) can be provided, comprising several additional protective-fabrics, advantageously arranged parallel to each other and at a distance from one another so as to define a plurality of air circulation passages. In this case, each profile or peripheral attachment (12) comprising an air outlet opening (5) in the adjoining underlying corridor. The smooth profiles (12) thus have air outlet openings (5) arranged relative to one another to define a downward circulation substantially vertical along the wall, until the air outlet opening (5) passes through the room. Furthermore, in the shown embodiment, the two fabrics are attached via common rail profiles (12). A separate profile of stringers may be provided, of course, for each of the fabrics without departing from the scope of the present disclosure.

[0096] As shown, air from the air suction openings (14) is blown by the ventilation or air conditioning system (10) into the circulation corridor or plenum (4) via the air inlet duct (9). As soon as it enters the air circulation corridor (4), the air flow rate is subjected to a flow section that is much greater than that of the air supply duct (9); the air speed then greatly decreases generating a laminar air flow entrained along a path substantially parallel to the ceiling wall (3), under the UVC light sources (6). The air is thus subjected to radiation from the UVC light sources (6) over the entire length of the circulation corridor and for a long period of time. By way of example, for a part of 20 m.sup.2 (5 m×4 m) powered by 800 m.sup.3/h of treated air and for an air circulation corridor with a height of 30 cm, the air will pass from a conventional speed of approximately 2.5 m/s in the pipe (9) to 0.18 m/s as soon as it enters the air circulation corridor (4), or a reduction by a factor of 14. Thus, in this configuration, the minimum exposure time of an air molecule will be 28 seconds. By way of comparison, it would be 0.4 seconds for a sterilization device inserted over 1 m from the air supply duct (9). This arrangement has the advantage of guaranteeing the treatment of air, regardless of its flow rate. In fact, depending on the value of the air flow rate and the geometry of the part to be treated, it is possible to determine the height of the air circulation or plenum passage (4) so as to obtain the desired exposure time to UVC. The air then passes through the outlet opening of the first fabric (8) and then the outlet opening of the second fabric (2) so as to be diffused toward the room to be treated.

[0097] In the embodiment shown, the ceiling or false ceiling structure (1) comprises a tensioned ceiling. The present disclosure is not limited to such a ceiling structure, with the structures comprising suspended ceiling tiles, metal ceilings or plaster, suspended islets or any other type of ceiling falling within the scope of the present disclosure.

[0098] Aside from the sterilization of the air passing through the air circulation corridor (4), the present disclosure has the advantage of ensuring sterilization of all the solid bodies opening on the circulation corridor (4) such as the lower face of the ceiling (3), the vertical drops between the ceiling (3) and the first fabric (8) or any element that would be installed within the circulation corridor (4).

[0099] Advantageously, the surfaces of the plenum formed by the air circulation corridor (4) such as the underside of the ceiling (3) or even the vertical drops between the ceiling (3) and the first fabric (8) can be covered with a hygienic material such as a stainless steel sheet or a polymer coating (such as PVC, for example), in particular, for the uses in premises that are constrained to strong hygienic constraints, such as hospitals.

[0100] Advantageously, the hygienic material used to trim the plenum surfaces (4) is reflective thus avoiding any loss of UVC radiation emitted within the plenum by absorption of the hygienic material.

[0101] In a particular embodiment, as shown in FIGS. 1-4, the ceiling structure comprises both the blowing of air treated and sterilized to the room or room to be treated and the intake of indoor air to the air treatment unit. In this case, the air intake is carried out along a wall opposite the air blowing wall via an air suction opening (14) equipped with a casing of an air return (15).

[0102] The present disclosure is described in the foregoing by way of example. It is understood that a person skilled in the art is able to produce different variant embodiments of the present disclosure without departing from the scope of the present disclosure.

EXAMPLES

Example 1

[0103] Disinfecting efficacy calculations were conducted via numerical simulations (CFD) on the basis of a defined part of 4 m wide by 5 m in length with 2.5 m height under ceiling, that is under the tensioned finishing fabric (2).

[0104] The height of the plenum (4) is 20 cm between the natural ceiling (3) of the part and the tensioned protective fabric (8).

[0105] Other simulations have been carried out by varying the height of the plenum (4) to a total height of 1 m, so as to evaluate the impact of this parameter on the disinfection quality.

[0106] The air conditioning/ventilation unit (10) provides an air flow rate of 343 m.sup.3/h, corresponding to a thermal power of 70 W/m.sup.2 on the ground, power commonly used for the purposes of cooling of buildings in France.

[0107] The air intake is carried out along a wall of 4 m via a 24 mm suction opening (14), a rectangular suction duct is connected to a suction box (15) composed of a separation partition (7) supported by the peripheral attachment profile (12).

[0108] The blowing of air treated by the air conditioning unit (10) into the plenum (4) by the rectangular network also called air ventilation (9) via 6 rectangular orifices of 300 mm×100 mm distributed over the width of the part.

[0109] The air outlet slot (5) to the part, with a width of 24 mm, is located on the small length of 4 m opposite the air suction opening (14).

[0110] UVC lamps (6) of OSRAM HNS 8 W G5 type of cylindrical tube type (diameter 16 mm and length 288 mm) are arranged in staggered rows along lines (13) at mid-height of the plenum (4), spacing of 50 cm between each line of lamps (13) or 9 lines of UVC lamps distributed over the length of 5 m, 7 UVC lamps (6) per line (13).

[0111] Another configuration was tested comprising 3 lines (13) of UVC lamps (6) or one line every 1.25 m.

[0112] Each UVC lamp (6) has a 2 W UVC transmission unit power according to the manufacturer's data.

[0113] Air disinfection thresholds used, also called dosages, for the simulations, that is the energy that an air molecule must receive in order to be freed of x % of the viruses and bacteria in the air were transmitted by the manufacturer of UVC Osram lamps. These thresholds are expressed in surface energy or the power received by an air molecule multiplied by the exposure time: [0114] Assay of 2.6 mJ/cm 2 for 90% disinfection, [0115] Assay of 5.0 mJ/cm 2 for 99% disinfection, [0116] Assay of 8.8 mJ/cm 2 for 99.9% disinfection.

[0117] FIG. 5 presents a horizontal section resulting from the result of the numerical simulations. This section is located at the level of the light sources (6) installed in the plenum (4).

[0118] The modeling has, in particular, the behavior of the flow of air blown into the plenum by viewing the air speeds.

[0119] There is, in particular, a distinction between the lines (13) of UVC light sources (6), the UVC light sources (6) arranged in anyone, the air suction box (15), the air suction opening (14), and the air outlet slot (5).

[0120] The air inlet air venting duct (9) ejects the blown air into the plenum (4) via 6 ports directed toward the right side of the plenum.

[0121] This model that made it possible to determine the efficiency results described below makes it possible, in particular, to observe that the air flow is transformed into laminar flow during its journey into the plenum, changing at very slow speeds and therefore subjected to a significant exposure time to UVC radiation emitted by the light sources. Thus, the geometry of the false ceiling structure (1) according to the present disclosure imposes a much longer exposure time and therefore improved sterilization efficiency.

[0122] FIG. 6 presents the impact of the height of the plenum (4) on the disinfection quality.

[0123] Indeed, the disinfection quality is directly related to the quantity of energy in mJ/m2 received by the air flow in the presence in the plenum.

[0124] This curve gives the x-axis the distance between an air molecule and a line (13) of 7 UVC light sources (6). On the y-axis, the amount of energy received by an air molecule depending on the distance between this molecule and the line of light sources is obtained.

[0125] The curve adopts the shape of a Gauss curve. Point A represents an air molecule located against the line (13) of UVC light sources.

[0126] Point B represents an air molecule located 25 cm under the line (13) of UVC light sources.

[0127] Point C represents an air molecule located 25 cm above the line (13) of UVC light sources (6).

[0128] The result of the simulations gives an energy quantity of precisely 1.02 mJ/m.sup.2 received by point A.

[0129] Thus, the farther the light sources (6) are, the higher the amount of energy received by the air and therefore the disinfection quality decreases.

[0130] It can be seen, in particular, that if it is desired to keep a reasonable part (20%) of the energy emitted by the line (13) of light sources, air must not be able to pass by more than 25 cm below or above the line (13) of the UVC light sources (points B and C), which corresponds, with the line of UV light sources ideally placed at mid-height of the plenum (4), to a maximum plenum height of 50 cm.

[0131] FIG. 7 represents the degree of disinfection in % of the interior air of the room or local to be treated as a function of the operating time of the light sources (6) and therefore of the system.

[0132] Two configurations were calculated: [0133] 9 lines (13) of light sources spaced apart by 50 cm for the continuous curve, [0134] 3 lines (13) of light sources spaced from 1.25 m for the dotted curve.

[0135] The calculations were carried out for a plenum (4) of 20 cm.

[0136] It can be seen that for 9 lines of light sources (6), less than 8 to 9 minutes of operation of the ventilation system (10) are necessary to achieve a 99.9% disinfection rate of the interior air of the component and that for 3 lines of light sources (6), less than 27 minutes of operation of the ventilation system (10) are necessary to achieve a 99.9% disinfection rate of the interior air of the part, independently of the number of occupants of the component.

[0137] In conclusion, the system thus tested has by the geometry of the plenum (4) a laminar flow of the air flow within the latter having the advantage of a long exposure time to the UVC flow emitted by the plurality of light sources (6).

[0138] The height of the plenum limited to 50 cm makes it possible to benefit from at least 20% of the UVC radiation emitted by the light sources (6) making it possible to limit the number and power of the latter.

[0139] With a spacing between the lines (13) of UVC light sources (6) of between 50 cm and 1.25 m, a reduced operating time of the system (between 8-9 and 27 minutes) makes it possible to achieve a degree of disinfection of the inside air of the part by 99.9%.

REFERENCE NUMBERS EMPLOYED IN THE FIGURES

[0140] 1: False ceiling [0141] 2: tensioned finishing fabric [0142] 3: ceiling of the room to be sterilized [0143] 4: so-called plenum space [0144] 5: air outlet slot [0145] 6: plurality of UVC light sources [0146] 7: separation partition [0147] 8: protective tensioned fabric [0148] 9: air inlet aeraulic ventilation [0149] 10: ventilation and/or air conditioning means [0150] 11: supply of treated air [0151] 12: peripheral hook profile [0152] 13: dials of light lamps [0153] 14: air intake openings [0154] 15: air suction channel also called air return box [0155] 16: deflector.