EP0490135A2 - Device for introduction of air in rooms and halls and method for this operation - Google Patents

Abstract

An air passage (1), which can be connected to an uptake of an air-conditioning installation, with an air-permeable outer pipe (2) which is provided with at least one terminal end plate (3.1) with a central overflow opening, through which the air can flow back into the centre of the air passage (1), and in which means for creating a turbulent flow are provided, is to be developed in connection with the connection means to the uptake in such a manner that it can be operated both in cooling and in heating operation, is simply constructed and can be manufactured economically. To this end, the outer pipe (2) of the air passage (1) is formed by a perforated sheet (5) with a free area of a maximum of 50%, preferably of 20% to 23%, and, for connection to the incoming-air line, an essentially round connection piece (6) is provided, which opens centrally and axially into the outer pipe (2) and in which there is arranged, as means for creating the turbulent flow, a turbulence vane apparatus (10), a second end plate (3.2) preferably receiving this connection piece (6); in another embodiment, there is provided, for connection to the incoming-air line, an essentially rectangular connection piece which extends at least over almost the entire length of the outer pipe of the air passage, opens tangentially into the outer pipe and is attached tangentially, as means for creating the turbulent flow, to the outer pipe, both ends of the outer pipe preferably being assigned a central overflow opening. <IMAGE>

Description

The invention relates to an air outlet connectable to a ventilation line of an air conditioning system with an air-permeable casing tube which is closed with at least one end face plate which has a central overflow opening through which air can flow back into the center of the air outlet, and with the means for generating a swirl flow are provided in connection with the connection means to the ventilation duct; it also relates to a method with which air can advantageously be introduced into the rooms or halls by means of such an air outlet.

For the ventilation of rooms and halls in which commercial or industrial work is carried out, pollutants are often dealt with and there are air contaminants that have to be flushed out with ventilation. The same applies if there are heat sources in the room or hall whose heat is transferred to the room air and whose temperature rises. Here, too, the heated air must be flushed out via ventilation to maintain a desired temperature. The flushed-out air with the absorbed air impurities and / or the absorbed heat leaves the room or the hall as exhaust air via appropriate lines. The air deficit due to the removal of the exhaust air is compensated for by introducing the supply air, so that the air balance in the ventilated room (or the hall) is maintained. This introduction takes place in such a way that, on the one hand, there is a rapid mixture with the room air, but on the other hand, a radiation effect which is disruptive to work physiology, in particular in cooling mode, is suppressed. For this purpose, the supply air is introduced into the room to be ventilated by means of suitable air passages to be connected to the supply lines of the air conditioning system, the aim being to ensure that the outflow is as uniform as possible with a homogeneous distribution of the outflow speed of the air.

In order to achieve such an outflow, tubular air outlets with an air-permeable casing tube with an air-permeable casing surface that are connectable to a ventilation line of an air conditioning system are known, in which at least one end is closed with an end face plate and the end plate of which has a central opening through which air flows into the center of the air outlet can flow back. Means for generating a swirl flow are also provided on these air passages in the area of the connection. The swirl flow can be generated with a swirl vane apparatus as described in DE-OS 33 04 151. The air outlet described there also points to the air inlet opposite side on a central opening that allows the passage of room air into the interior of the body of the air outlet. The swirl flow has a sufficient degree of turbulence to mix the transferred room air with the supply air. In order to achieve a uniform outflow, special guide internals are provided which disrupt the swirl flow and thus question the desired mixing effect. In addition, behind each of the ring-shaped baffles, a dead zone forms, the negative pressure of which results in an undesirable backflow to the actual outflow area.

This is where the invention comes in, which is based on the object of developing such an air passage in such a way that it can be operated both in cooling and in heating operation, is simple in construction and can be produced economically; Furthermore, a method is to be specified in which, at least in the cooling mode, the outflow of air takes place uniformly over the entire length and in which additional guidance devices can therefore be dispensed with.

This object is achieved in that the jacket tube of the air passage is formed by a perforated plate with a free area of at most 50%, preferably from 20% to 23%, and that for connection to the supply air line a centrally and axially opening into the jacket tube, in substantially round connecting piece is provided, in which a swirl vane apparatus is arranged as a means for generating the swirl flow, a second end plate preferably receiving this connecting piece. Alternatively, it is proposed that for connection to the supply air line at least one substantially rectangular connecting piece extending over almost the entire length of the casing pipe of the air outlet and tangentially opening into the casing pipe is formed, which is attached tangentially to the casing pipe as a means of generating the swirl flow, preferably both ends of the casing tube each having a central one Overflow opening is assigned. In both cases, the supply air prepared in the air conditioning system and coming from it is introduced into the air passage in such a way that a swirl flow is formed which is stable in itself, also against an outflow of the portion of the air supplied as supply air to the air passage through the air-permeable jacket surface of the Casing tube of the air outlet.

This swirl flow corresponds to a vortex, the core of which forms a vertebral depression with a pronounced negative pressure, the size of the negative pressure depending on the vortex strength. Due to this negative pressure, room (or hall) air is sucked in through the central opening in one end plate and mixed into the supply air. The diameter of this central overflow opening is in a range from approximately 85% to 40% of the inner diameter of the casing tube. It can be used to set the ratio of supply air to sucked-back room air for a certain range of vortex strength.

To simplify adjustments, the first end plate provided with the central overflow opening for the return flow of the ambient air is expediently fastened to the tubular body, or a cap is provided with the necessary central overflow opening, which is interchangeably placed on the end plate with a maximum central overflow opening. A further adaptation to the desired outflow conditions is possible in that the end of the casing tube assigned to the central overflow opening has an axially displaceable insert with the central overflow opening.

A change in the swirl can be changed in one of the embodiments of the air passage by changing the angle of attack of the swirl vanes of the swirl vane apparatus in the central supply air connection respectively. In the other embodiment, the entry speed of the supply air into the interior of the casing tube and thus the vortex strength is alternatively achieved by adjusting the width of the tangential gap at the mouth of the essentially rectangular connecting piece into the casing tube, due to the inflow reaching almost over the entire height a sufficiently uniform distribution of the air and thus the desired swirl flow with its stability is achieved.

The adjustable swirl sensor also allows the air outlet to be operated in both cooling and heating mode. If, in cooling operation, a uniform flow is required with air outlets arranged near the ceiling, the swirl is used. In the heating mode, under the same circumstances, the heated air would flow upward immediately after leaving the air passage, and the heating goal would be missed. If, on the other hand, the swirl is suppressed during heating operation by appropriately adjusting the swirl sensors, the swirl essentially takes place through the open central opening at the front (which is directed downwards when the air outlet is installed near the ceiling), so that the heated air flows as a jet in the direction of the axis of the casing tube of the air outlet.

Lifting elements which can be moved in the axial direction and which are connected to each of the swirl vanes via articulated levers, which adjust them steeper or flatter during the stroke depending on the lifting direction, are suitable as adjusting members. However, it can also be a centrally acting adjusting element (as described, for example, in P 40 26 961.2), which is provided, for example, with bevel gears for each of the swirl vanes and corresponding bowling lanes, which preferably interact with one another via intermeshing teeth. Finally, there is also the possibility of setting each swirl vane separately from the outside by means of a swirl vane shaft which is guided outwards.

The outflow conditions can be influenced by the free area of the perforation of the perforated plate of the casing tube of the air outlet. A stronger effect is achieved if the jacket tube is covered with a filter layer, the resistance coefficient of which - the ratio of the pressure drop in the air flowing through the filter layer to its dynamic pressure - being kept greater than 10. Such filters can be designed as surface filters, the typical representatives of which are membrane filters; smoothed fleece filters have a similar filter effect. Such filters have only a low dust storage capacity, so they are preferably used where sufficient pre-cleaning of the air can be expected to have a tolerable service life. In the other case, the depth filters are displayed, which, however, have a larger volume and thus enlarge the diameter of the air outlet. Regardless of the filter type, these filters applied to the casing pipe act solely through their flow resistance, which is reflected in the resistance coefficient ratio of the pressure difference of the supply air flowing through the air-permeable casing pipe, possibly with the filter layer, to its dynamic pressure.

Such air passages are advantageously operated in such a way that the ratio of the peripheral speed of the swirl flow to the outflow speed from the air-permeable jacket tube is kept greater than 4: 1, the ratio of the length of the jacket tube to its diameter being not greater than 10: 1. Through these parameters, a stable flow state is achieved, which allows an outflow in the sense of a thread source over its entire length, which is so uniform that additional guide devices for discharging the outflowing air become superfluous. This flow state is based on a stable swirl flow, and the loss of flow energy due to the outflow of air from the wall area is compensated for by the replenishment of flow energy when the air flows in, thereby into the negative pressure area of the vortex core is sucked air back out of the room (or hall) through the central opening in one end plate, which also helps to stabilize the vortex.

This surprisingly simple solution makes it possible to dispense with additional internals which guide the outflow; since such installations are difficult to manufacture on the one hand and on the other hand make the installation of such air passages more difficult, the elimination of these installations is the advantage which has a decisive influence on and favors the economy of their production.

In addition, it is advantageous if the outflow of the air through the air-permeable jacket pipe against a resistance coefficient of the outflow surface of the air-permeable jacket pipe based on the dynamic pressure of the outflowing air is greater than 10. This outflow resistance creates a "backflow" which additionally stabilizes the swirl flow.

As a typical example of such an air outlet, one with a jacket tube with a diameter of 400 mm was examined. The length of the casing tube is easily adapted to the air flow; an outflow speed of 0.55 m / s was used in the test setup. This resulted in an air-permeable jacket tube length of 600 mm for an air flow of 1000 m³ / h; for an air flow of 2500 m³ / h that of 1,500 mm. The supply air was supplied via a central connection in one end plate, in which the swirl vane apparatus was also used as a swirl generator, the swirl vanes of which were brought to an angle of 48 ° - 50 °. Despite considerable differences in the air speed in the supply air connection (2.2 m / s ./. 5.5 m / s), the measurements showed no differences in the outflow speed, both in one and in the other Air flow with values around 0.55 m / s was determined. The peripheral speeds were 4.6 m / s in the first and 8.5 m / s in the second.

Here is another surprising advantage of such air outlets: A change in the air flow can be intercepted over a certain range. If this is ruled out due to changes in the air flow that are too great, an air outlet of greater (or shorter) length can be attached to the same nozzle diameter without the need for complex assembly work that is always necessary when the connections change in diameter.

Fig. 1:

Luftdurchlaß mit axialem Lufteintritt und Drallflügelapparat (geschnitten, schematisch);

Fig. 2:

Funktionsschema des Luftdurchlasses, a: Kühlfall, b: Heizfall;

Fig. 3:

Luftdurchlaß mit tangentialem Lufteintritt und Dralleinstell-Zunge (geschnitten, schematisch);

Fig. 4:

Einzelheit Anordnung Stirnplatte mit zentraler Öffnung, a: Stirnplatte mit Kappe, b: Verschiebbare Stirnplatte;

Fig. 5:

Anordnung der Luftdurchlässe an der Lüftungsleitung, a: Axiale Einströmung, b: Tangentiale Einströmung.

The essence of the invention is illustrated by way of example with reference to FIGS. 1 and 5; show

Fig. 1:

Air outlet with axial air inlet and swirl vane apparatus (cut, schematic);

Fig. 2:

Functional diagram of the air outlet, a: cooling case, b: heating case;

Fig. 3:

Air outlet with tangential air inlet and swirl adjustment tongue (cut, schematic);

Fig. 4:

Detail arrangement of end plate with central opening, a: end plate with cap, b: sliding end plate;

Fig. 5:

Arrangement of the air outlets on the ventilation duct, a: axial inflow, b: tangential inflow.

1 shows a section through an air passage 1, which is connected via the axial connector 6 to a ventilation line L (FIGS. 4, 5) of an air conditioning system, via which the supply air is supplied to the air passage. The air passage 1 is provided with an air-permeable casing tube 2, the casing tube 2 of the air passage 1 being shown broken. The casing tube 2 consists of a perforated plate 5 which is arranged between the two end faces 3.1 and 3.2 and is formed into a tube and which is formed from strips of metal or from plastic strips. The perforation of the perforated plate 5 is chosen so that the free area is a maximum of 50%. In general, this perforation is chosen so that the desired drag coefficient is given directly by the perforation; If the coefficient of resistance is given by means of a layered filter 7 applied to the outside (or also to the inside) of the perforated plate 5 of the casing tube 2, the perforated plate merely forms the support for this filter layer regardless of the perforation, which can then be selected from the point of view of stability. Naturally, however, the resistance coefficients can also overlap, so that a narrower perforation can compensate for a resistance coefficient of a filter layer that is too low. For the application of such a filter layer 7 - indicated here as a depth filter with a tangled fiber structure - both end plates 3.1 and 3.2 have protrusions 8 which fix the filter layer 7 in the axial direction as rings. The filter layer 7 can also be fixed in the radial direction, for example with a grid basket (not shown in FIG. 1) which is placed around the filter layer 7 and holds it. The first end plate 3.1 has a central overflow opening 4 with a diameter "d", through which room air can enter the casing tube 2 if there is negative pressure inside it, for example as a result of a vortex flow, and through which supply air can also exit if the Pressure conditions dictate this. The second end plate 3.2 is provided with a nozzle 6, via which the air passage 1 is connected to a ventilation line L (Fig. 4, 5) of an air conditioning system.

In this connecting piece 6 there is a swirl vane apparatus, which is designed as a rotary adjusting member 10.1, with the aid of which in the casing tube 2, the inside diameter of which is denoted by “D” is a swirl flow, a vortex is forced, the vortex core of which creates the vacuum region necessary for the backflow of the room air. This swirl vane apparatus 10 consists of a number of radially arranged swirl vanes 11, each of which is arranged on an axis 11.1. The free ends of the axes 11.1 can be supported in abutments 6.1 arranged on the inner wall of the connecting piece 6. The swirl vanes 11 are adjustable via these axes 11.1, a central adjustment by a central rotary hub 12 effecting a uniform adjustment of the swirl vanes 11. For this purpose, the stub axles projecting into the rotating hub 12 are provided with toothed bevel gears which run on a track toothed in the same way and are rotated when the adjusting part of the hub is rotated and thereby take the vanes with them. Such an adjustment of the swirl blades is expediently carried out by motor, so that remote control is possible. For this purpose, the rotatable part of the rotary hub 12 is connected via a shaft 13 to a drive motor 14 which is held in the connection piece 6 via brackets 15. An outward connection 14.1 establishes the connection to the control, which can also be accommodated in the central unit of the air conditioning system.

It is also conceivable that the control is influenced by the temperature difference: If the supply air is fed in with a significant undertemperature (cooling operation), the swirl vanes 11 are set flat to increase the peripheral speed of the swirl flow and thus the vortex strength. This reinforces the negative pressure area that arises in the vortex core, so that on the one hand direct blowing out of the cold supply air is suppressed and on the other hand that a considerable proportion of room air is sucked back and mixed in the air passage 1 with the cold supply air to reduce the temperature difference. The smaller this temperature difference, the less important the admixture of room air, the vortex strength can therefore be reduced in this case will. In the transition to heating, the temperature difference is reversed: the supply air becomes warmer than the room air. In this case, jet ventilation is preferable to the source ventilation. Therefore, at the positive temperature difference in the heating case, the swirl vanes 11 are set in such a way that no swirl is specified; a vortex cannot form. In this case, the air passage 1 acts as a jet passage, the supply air jet emerging from the central overflow opening 4 in one end plate 3.1, the radial outflow being largely suppressed due to the relatively high resistance coefficient of the casing tube 2.

Figures 2 show a functional diagram of an air outlet with axial inflow through a nozzle 6, which with a ventilation line L (Fig. 4), in Figure 2a, the outflow of air in the cooling case (large swirl strength) and in Figure 2b, the outflow of the Air in the case of heating (disappearing swirl strength) are indicated with flow arrows. In both cases, the supply air is supplied via the connector 6 and flows through the casing tube 2, which here has the same diameter as the connector 6, whereby an end plate provided at the connector end is superfluous. This embodiment avoids different diameters and is always suitable when mounting from above, for example through a suspended ceiling, and a ceiling opening is unavoidable. The illustration of a filter layer surrounding the jacket tube has been dispensed with here, it goes without saying that an externally applied filter layer can also be provided here if the perforation of the perforated plate 5 of the jacket tube 2 does not already offer the necessary resistance. The swirl is generated with the help of the swirl vane apparatus, designed as a stroke adjusting member 10.2, the adjusting member 22 of which transmits an axial stroke to the swirl vanes 11 by means of articulated levers 23 (for the sake of clarity only shown for one of the swirl vanes).

In the cooling case, the swirl vanes 11 are set flat, the air passing into the jacket tube thereby gets a high peripheral speed; stimulated by this large circumferential speed, the desired vortex is formed. Through the overflow opening 4 in the free end plate 3.1, room air is sucked into the negative pressure area of the vortex core, which mixes with the supply air in the swirl flow and raises its lower temperature and thus reduces the temperature difference between room air and supply air flowing into the room. This supply air flows out radially in accordance with the arrows shown.

In the case of heating, the swirl vanes 11 are fully open, no speed component is transmitted in the circumferential direction to the air flowing into the jacket tube, it flows in without pre-twist, and a purely axial flow is established. The majority of the air leaves the air passage through the overflow opening 4 in the free end plate 3.1 approximately like a jet. The free end plate 3.1 with the overflow opening 4 acts as an orifice, the outflowing air creates a pressure difference which increases the pressure inside the tubular body and thus causes a smaller portion of the supply air which has flowed into the passage to flow radially away. It goes without saying that, depending on the required temperature conditions, intermediate positions of the member producing the swirl allow an almost smooth transition from the described "pure" cooling case to the "pure" heating case.

FIG. 3 shows an alternative embodiment of the air passage 1 with a jacket tube 2, which here is connected by means of a tangential socket 16 which opens tangentially into the jacket tube 2 and which extends at most over the entire length, advantageously over about 2/3 to 3/4 of the length of the air passage 1 extends, preferably symmetrically to the two end plates 3.1, is connected to the ventilation line L. The one from the air conditioner supplied supply air flows into the casing tube 2 at a speed lying essentially in the circumferential direction, which can be changed within certain limits by a hinged tongue 18. In order to be able to introduce the supply air overflowing through the tangential connection 16 from the ventilation line L to the air outlet 1 "smoothly" into the casing tube 2 of the air outlet 1, a flow rectifier 17 is arranged in the tangential connection 16. The inflow speed is changed with an adjustable tongue 18 which is articulated to the tangential connector 16 by means of a joint. A protruding reset lever 18.1 ensures with a return spring 20 that the tongue 18 strives to go into a position corresponding to a low inflow speed. While the tongue 18 extends over the entire length of the tangential connector 16, one or two reset levers 16. These reset levers 16.1 are also used to adjust the tongue 18. For this purpose, swivel levers 19 are provided which are articulated on the tangential socket 16 and are connected to a swivel drive 21. These pivot levers 19 are under the action of the return spring 20 on the curved inside of the return lever 16.1 and change its position when pivoted, which is stabilized by the return springs 20.

4 shows the arrangement of the end plate 3.1 with the central return flow opening 4. In order to be able to change the ratio of supply air coming from the air conditioning system to air coming out of the room and being sucked back through the central overflow opening in the cooling case, the central overflow opening 4 is used to change it provided end of the casing tube 2 a cap 3.3, in which there is a central overflow opening 4 ', the diameter of which is smaller than that of the overflow opening 4 of the end plate 3.1. This cap can be replaced, making the one you want Makes change. In other cases, there may be a need to adjust the outflow conditions to local conditions. For this purpose, the embodiment according to FIG. 4b is provided with an axially displaceable insert 3.4, which replaces the end plate 3.1 and has the central overflow opening 4. Here, too, a plate 3.5 reducing the diameter of this central overflow opening 4 can be used, the central overflow opening 4 'of which has the diameter suitable for setting the mixing ratio of supply air to recirculated room air. In both cases, the diameter of the central overflow opening 4 of the end plate 3.1 (FIG. 4a) or of the displaceable insert 3.4 which takes the place of this end plate (FIG. 4b) is the maximum diameter which ensures the function of the air passage. The attached cap 3.3 or the inserted plate 3.5 can only reduce the diameter acting for the backflow with their diameters 4 '. It goes without saying that, in the embodiment according to FIG. 4a, the attached cap 3.3 can only take the place of the end plate 3.1, which is replaced when changes are required. This also applies analogously to the displaceable insert 3.4 of the embodiment according to FIG. 4b, which is then replaced instead of an insert 3.5 which reduces the effective backflow diameter.

5 finally shows the arrangement of a plurality of air passages 1 on a ventilation line L guiding the supply air from the air conditioning system to the air passages, FIG. 5a relating to the arrangement with air passages with axial and FIG. 5b relating to the arrangement with air passages with tangential air entry. In both cases, the air outlets 1 - only two in each of the illustrations - are placed in the desired manner in the room and connected to the ventilation line L. With an axial inflow, there are the axial connections 6, with a tangential one Inflow the tangential 16 provided. While the air outlets 1 with an axial inflow are primarily oriented at right angles to the ventilation line L (which does not mean that other orientations would not be possible by means of a suitable routing of the line between the ventilation line L and the axial connector 6), the air outlets 1 with a tangential inflow are above the Tangential socket 16 primarily parallel to the ventilation line L. The position of the latter can also be shifted by a pipe diameter to one or the other side or alternately to one and the other side, as indicated. It goes without saying that the directions of the rectangular connecting piece 16 coming from the ventilation line L can also be at an angle to one another (as indicated next to FIG. 5b), so that a ventilation line L supplies a wide strip of the room or hall in the Location is. The air outlets with tangential inflow have end plates 3.1 with a central overflow opening 4 on each of their end faces, so that they can be held longer.

Claims (16)

Air outlet connectable to a ventilation line of an air conditioning system with an air-permeable casing tube which is closed with at least one end face plate which has a central overflow opening through which air can flow back into the center of the air outlet and in which means for generating a swirl flow are provided in Connection to the connection means to the ventilation duct, characterized in that the casing tube (2) of the air passage (1) is formed by a perforated plate (5) with a free area of at most 50%, preferably from 20% to 23%, and that for Connection to the supply air line is provided with a substantially round connecting piece (6) which opens centrally and axially into the casing tube (2) and in which a swirl vane apparatus (10) is arranged as a means for generating the swirl flow, preferably a second end plate (3.2) this connecting piece (6) takes. Air outlet connectable to a ventilation line of an air conditioning system with an air-permeable casing tube which is closed with at least one end face plate which has a central overflow opening through which air can flow back into the center of the air outlet and in which means for generating a swirl flow are provided in Connection to the connection means to the ventilation duct, characterized in that the casing tube (2) of the air passage (1) is formed by a perforated plate (5) with a free area of at most 50%, preferably from 20% to 23%, and that for Connection to the supply air line is formed at least one substantially rectangular connection piece (16) extending over almost the entire length of the casing pipe (2) of the air passage (1) and tangentially opening into the casing pipe (2), which is tangential as a means for generating the swirl flow is attached to the casing tube (2), preferably both n ends of the casing tube (2) a central overflow opening (4; 4 ') is assigned. Air outlet according to claim 1 or 2, characterized in that the end of the casing tube (5) associated with the central overflow opening (4) is covered with a cap (3.3) with a central overflow opening (4 ') with a reduced diameter. Air outlet according to claim 1 or 2, characterized in that the end of the casing tube (2) assigned to the central overflow opening (4) has an axially displaceable insert (3.4) with the central overflow opening (4; 4 '). Air outlet according to one of claims 1 to 4, characterized in that the perforated plate (5) forming the air-permeable casing tube (2) is preferably coated on its outside with a layer-shaped particle filter (7). Air outlet according to claim 5, characterized in that the particle filter (7) is designed as a surface filter, preferably as a membrane filter. Air outlet according to claim 6, characterized in that the particle filter (7) is designed as a depth filter, preferably as a random fiber fleece. Air outlet according to claim 1 and one of claims 3 to 7, characterized in that the swirl vanes (11) are adjustable by means of a swirl vane apparatus (10.1; 10.2) to change their position. Air outlet according to claim 8, characterized in that the swirl vane apparatus for adjusting the swirl vanes (11) is designed as a central lifting element (10.2), the stroke of which can be transmitted as a pitch adjustment with levers articulated on the swirl vanes (11). Air outlet according to claim 8, characterized in that the swirl vane apparatus for adjusting the swirl vanes (11) is designed as a central adjustment (10.1) with a rotary hub (12), the rotation of which is carried out with a tapered path and corresponding to the stub axles (11.1 ) of the swirl blades (11) connected bevel gears, which are preferably interlocked with one another, can be transferred as a pitch adjustment. Air outlet according to claim 8, characterized in that for adjusting the swirl vanes (11) of the swirl vane apparatus, their axes (11.1) are guided outwards and are provided with attack means (eg hexagon or the like) for turning. Air outlet according to claim 2 and one of claims 3 to 7, characterized in that the inlet cross-section of the air outlet (1), which extends almost over the entire length of the casing tube (2) and opens tangentially into the casing tube (2) to generate the swirl flow, in essentially rectangular connecting piece (16) can be changed by means of a pivotable tongue (17). Air outlet according to claim 12, characterized in that the pivotable tongue (17) is provided with a pivot drive (18). Air outlet according to claim 8 or 13, characterized in that the swirl flow generator (10.1, 11; 10.2, 11; 18, 21;) which determines the swirl flow intensity is adjustable from the central unit of the air conditioning system by means of a remote-controlled actuator. Method for introducing air conditioned in an air conditioning system into rooms or halls, in particular with sources of pollutants and / or heat, by means of an air outlet according to one of claims 1 to 14, characterized in that, at least in cooling operation, a ratio of the peripheral speed of the swirl flow in the jacket tube set to greater than 4: 1 for the outflow velocity from its air-permeable jacket is, with a ratio of the length of the air-permeable jacket tube to its diameter not greater than 10: 1, wherein the swirl flow is preferably suppressed in heating mode. A method according to claim 15, characterized in that the air flows through the air-permeable jacket tube against a resistance whose resistance coefficient, based on the dynamic pressure of the air flowing through the jacket tube, is greater than 10.

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