EP2677243A2 - Method and device for processing the room air of a clean-room - Google Patents

Abstract

The method involves mixing conditioned external air (16) and circulating air (17) in a mixture space (3) to an air mixture (19). An air mixture volumetric flow formed from the air mixture is conducted by a flow exit plane (7) into a clean room (5). An external air volumetric flow formed from the conditioned external air, circulating air volumetric flow formed from circulating air and/or air mixture volumetric flow is heated by a decentralized air conditioning module (8). The air conditioning module is formed by an electrical heating element.

Description

introduction

1. a) Außenluft wird mittels einer zentralen Luftkonditionierungseinrichtung konditioniert, insbesondere gefiltert und/oder sterilisiert und/oder entfeuchtet oder befeuchtet und/oder gekühlt oder geheizt.
2. b) Ausgehend von der Luftkonditionierungseinrichtung wird konditionierte Außenluft mittels mindestens eines Außenluftkanals in Richtung mindestens eines Mischraums geleitet.
3. c) Mittels einer Luftfördereinrichtung wird aus dem Reinraum stammende Umluft mittels mindestens eines Umluftkanals in den Mischraum gefördert.
4. d) Die konditionierte Außenluft und die Umluft werden in dem Mischraum zu Mischluft vermischt.
5. e) Ein von der Mischluft gebildeter Mischluftvolumenstrom wird durch mindestens eine Luftaustrittsfläche in den Reinraum geleitet.

The invention relates to a method for conditioning room air of a clean room, in particular an operating room, comprising the following method steps:

1. a) Outside air is conditioned by means of a central air conditioning device, in particular filtered and / or sterilized and / or dehumidified or moistened and / or cooled or heated.
2. b) Starting from the air conditioning device, conditioned outside air is directed by means of at least one outside air channel in the direction of at least one mixing space.
3. c) By means of an air conveyor originating from the clean room circulating air is conveyed by means of at least one circulating air channel into the mixing chamber.
4. d) The conditioned outside air and the circulating air are mixed in the mixing space to mixed air.
5. e) A mixed air volume flow formed by the mixed air is passed through at least one air outlet surface into the clean room.

Furthermore, the invention relates to a device for conditioning of indoor air of a clean room, in particular an operating room, comprising at least one air conveyor for conveying from the clean room originating circulating air in at least one mixing chamber and at least one outside air duct for conducting conditioned outside air into the mixing chamber, wherein the outside air duct on a the end facing away from the mixing chamber is connected to a central air conditioning device by means of which the outside air can be conditioned, in particular filterable and / or sterilized and / or dehumidified or humidified and / or cooled or heated, wherein in the at least one mixing chamber, the conditioned outside air with the circulating air mixed air is mixable and the mixed air via at least one air outlet surface, starting from the device into the clean room is conductive.

State of the art

A method and a device of the type described above have been known in practice for some time. That's how it shows DE 34 00 487 A1 a ventilation system for the recirculation mode in operating theaters, where outside air conditioned by a central air conditioning system is mixed with circulating air from the operating room to be ventilated. In this way it is possible to avoid cooling the circulating air and instead to cool only the outside air. Since the circulating air is mixed with the outside air, it is thus possible to cool it by means of the mixed air conducted into the operating room. The device shown has the disadvantage that the temperature of the mixed air mixed from circulating air and outside air can not be adjusted individually. Although the capacity of the central air conditioning system is variable, so that the outside air is cooled more or less, the set temperature is then without exception for all rooms whose outside air duct is connected to the air conditioner. The possibility of individualizing the temperature of the mixed air in individual rooms by means of in the DE 34 00 487 A1 not shown given device.

Alternatively, the shows DE 20 2005 000 661 U 1 a device that relies on individual cooling modules in the respective recirculation unit in order to cool the mixed air mixed from circulating air and outside air. The outside air can also be pre-cooled by means of a central air conditioning system. The device shown is suitable for adjusting the temperature of the mixed air individually at each room to be ventilated by means of the circulating air. A change in the mixing ratio of outside air and mixed air is not necessary. However, the device shown has the disadvantage that cooling modules pose the risk of germination. This is due to the fact that the heat exchanger used to cool the recirculating air flow is charged with cold water, so that the lines used for heat exchange are cooled. If the relative humidity of the circulating air is high, it is highly probable that, as the airflow cools, the relative humidity of the cooled air rises to 100% and condensation on the cool lines of the heat exchanger fails. This Condensation provides an optimal basis for germs and other microorganisms, so that their reproduction is imminent. Especially in the field of clean rooms, which are urgently to be kept free from germs, such as operating theaters, such a colonization of microorganisms is urgently to be avoided.

The DE 299 16 321 U 1 shows a device in which a mixed air volume flow formed from a recirculating air volume flow and an outside air volume flow is indirectly conditioned by treating the circulating air volume flow. This is done by means of an air conditioning module, which is arranged in the region of an air inlet cross-section of the device through which the circulating air volume flow enters the device. In practical operation, the device has the disadvantage that the air conditioning module for the circulating air has to be particularly powerful, since the circulating air volume flow to be influenced by means of this is typically very large in terms of amount.

In a broader sense related to a device of the type described above is the one according to the US 2,144,693 , which shows a purely decentralized air treatment device for a target area to be ventilated. A preconditioning of air does not take place.

task

The object of the present invention is correspondingly to bring about a possibility for individual temperature control of the room air of a clean room, in particular an operating room, which is not subject to the aforementioned disadvantages.

solution

• f) Ein von Außenluft gebildeter Außenluftvolumenstrom wird mittels mindestens eines dezentralen Luftkonditionierungsmoduls erhitzt, wobei das Luftkonditionierungsmodul vorzugsweise von einem elektrischen Heizregister gebildet ist.

The underlying object is achieved on the basis of a method of the type described above according to the invention by the following method step:

• f) An outside air volume flow formed by outside air is heated by means of at least one decentralized air conditioning module, wherein the air conditioning module is preferably formed by an electrical heating register.

The term "decentralized air conditioning module" is to be understood here as meaning that this particular air conditioning module can only heat the outside air volume flow which corresponds in that with the respective individual clean room. The decentralized air conditioning module is therefore not suitable, for example, to influence an outside air volume flow, which is passed to another clean room. Like the influencing of individual rooms, the influencing of individual room groups is likewise conceivable, with the decentralized air conditioning module being arranged, for example, in an outside air duct leading to a group of individual clean rooms.

The decentralized air conditioning module offers the particular advantage that a single clean room (or a room group) can be individually supplied. This is illustrated by the following example: A single operating room should be operated at a room air temperature of 26 ° C, while other operating rooms should have only a room air temperature of 22 ° C. By means of the method according to the invention, it is readily possible to configure the central air treatment device so that the outside air drawn in from outside is preconditioned, for example, to 12 ° C. (either cooled or heated, depending on the weather conditions), the mixture of the conditioned outside air with the Convection then the desired temperature of 22 ° C is reached. A proportion of the outside air at the subsequent mixed air volume flow is about 15%, while the proportion of recirculated air is corresponding to about 85%. In order to increase the temperature of the mixed air volume flow flowing into the first operating room, the temperature of the outside air volume flow can be raised decentrally by means of the decentralized air conditioning module, whereby in all the procedure only one operating room is affected, which is to have a different temperature and which corresponds to the decentralized air conditioning module ,

In this example, the outside air volume flow leading to the first operating room should be heated decentrally from 12 ° C to 17 ° C, while the circulating air volume flow and the mixed air volume flow are not directly influenced. Due to the increased temperature of the outside air volume flow, the temperature of the mixed air volume flow mixed therefrom and the recirculated air volume flow is correspondingly higher than in the other operating rooms whose outside air volume flow continues to have the temperature of 12 ° C. The temperature of the mixed air amounts to in the present example T = 0.15 × 17 + 0.85 × 27.5 = 25.9 ° C, assuming that the circulating air has a temperature of 27.5 ° C. The remaining operating theaters are not influenced by this individual setting of the one operating room. In this way, an individual setting possibility for the individual clean rooms - explained here using the example of the operating room - possible. The targeted influencing of the outside air volume flow is particularly advantageous insofar as the outside air volume flow has comparatively low air volumes. This is already clear from the example calculation shown above. Thus, the proportion of the outside air volume flow to the resulting mixed air volume flow is typically in the range of less than 20%. The remaining at least 80% are correspondingly formed by a circulating air volume flow. From a technical point of view, the lower air volumes of the outside air volume flow can be significantly more easily influenced or changed than the high air volumes of the circulating air volume flow, let alone the resulting mixed air volume flow.

The heating of the outside air volume flow by means of an electrical heating register is particularly easy. For this purpose, in particular the laying of water pipes or the like, as would be necessary when using a heat exchanger, not required. Furthermore, the installation of an electric heater is particularly easy.

• g) Ein von Außenluft gebildeter Außenluftvolumenstrom wird mittels mindestens eines dezentralen Luftkonditionierungsmoduls mengenmäßig beeinflusst, wobei eine Menge pro Zeit des von dem Außenluftkanal in den Mischraum einströmenden Außenluftvolumenstroms geregelt wird und wobei das Luftkonditionierungsmodul vorzugsweise von einem Volumenstromregler gebildet ist.

The underlying object is further solved by the following method step:

• g) An outside air volumetric flow formed by outside air is quantitatively influenced by means of at least one decentralized air conditioning module, wherein an amount is regulated per time of the outside air volume flow flowing from the outside air duct into the mixing space and wherein the air conditioning module is preferably formed by a volume flow regulator.

Such an air conditioning module is suitable for influencing the mixing ratio of the conditioned outside air and the recirculated air by quantitatively influencing the outside air volume flow by means of the air conditioning module. Based on the example described above, an influence on the room temperature of a single room can be achieved as follows: The circulating air volume flow has a temperature of 27.5 ° C, while the outside air volume flow is 12 ° C cold. The Typical mixing ratio of conditioned outside air to circulated air is approx. 15:85.
The mixed air volume flow at this ratio has a temperature of T = 0.15 · 12 + 0.85 · 27.5 = 25.2 ° C. The desired room temperature is 26 ° C. In the present example, the outside air volume flow should be changed by means of the air conditioning module according to the invention. In this example, its proportion in the mixed air volume flow is reduced to 10%, while the circulating air volume flow is relatively increased, so that the mixed air volume flow remains identical in terms of volume. The new mixing ratio of conditioned outside air to recirculated air is therefore 10: 90 below. The temperature of the mixed air volume flow changes accordingly to T = 0.10 · 12 + 0.90 · 27.5 = 26.0 ° C. This change will not affect the remaining operating theaters. The setting is decentralized, so that there are no effects on other rooms.

In addition to the possibility shown for heating the outside air volume flow or the quantitative influence of the same is of course also a combination of both methods conceivable. Thus, for example, the outside air volume flow could both be heated decentrally and increased in terms of volume.

A particular problem with the mixing of air flow rates with different state properties lies in a sufficient homogenization of the resulting mixed air volume flow. In particular, the non-uniform temperatures of the air volume flows to be merged should lead to a homogeneously tempered mixed air volume flow after mixing, since heterogeneous temperature levels within an air volume flow involves the risk of inconsistent flow paths, since the different air temperatures lead to different local air densities. Therefore, it is particularly advantageous if the conditioned outside air volume flow is swirled by means of a mixing element arranged in the outside air duct, preferably adjoining the mixing space, so that the outside air volume flow has a turbulent flow characteristic as it enters the mixing space. Such a turbulent flow characteristic is particularly advantageous in order to achieve a good "mixing" of the circulating air volume flow and the outside air volume flow in the mixing space.

In addition to the pure "turbulence" of the outside air volume flow before it enters the mixing chamber, it is also advantageous to accelerate the conditioned outside air volume flow by means of a nozzle element arranged in the outside air duct, preferably adjoining the mixing space, so that the outside air volumetric flow flows as far as possible into the mixing space. In this way, it is ensured that the outside air volume flow can reach substantially any point of the mixing space and the circulating air flowing into the mixing space as it flows through the mixing space in each case comes into contact with the outside air volume flow and is mixed with it. Due to the higher flow velocity of the outside air volume flow, the mixing capacity of the circulating air volume flow with the outside air volume flow is correspondingly increased.

As an alternative or in addition to influencing the outside air volume flow by means of the described mixing element and / or the nozzle element, it is of course also possible to influence the circulating air volume flow accordingly. However, due to the particularly high volume of the recirculating air volume flow in comparison to the outside air volume flow, a change in the outside air volume flow in particular is more favorable.

From a device engineering point of view, the underlying object is achieved on the basis of a device of the type described above by at least one decentralized air conditioning module, by means of which an outside air volume flow formed by the conditioned outside air can be heated, wherein the air conditioning module is preferably formed by an electrical heating coil. The inventive method according to claim 1 is particularly easy to implement by means of this device.

Alternatively or additionally, the object is solved from a device-technical point of view by at least one decentralized air conditioning module, by means of which an outside air volume flow formed by the conditioned outside air can be influenced in quantity, wherein an amount per time of flowing from the outside air duct into the mixing chamber outside air volume flow is adjustable and wherein the air conditioning module preferably is formed by a volume flow controller. As is clear above with reference to the described method according to the invention, the underlying object can be achieved both by means of the air conditioning module for heating the outside air volume flow be solved alone by means of the air conditioning module to the quantitative influence of the same. Furthermore, a combination of both is conceivable.

In an advantageous embodiment, the device according to the invention has a mixing element, preferably in the form of a swirl element, which is arranged in the outside air duct, preferably in an end section of the outside air duct facing the mixing chamber, and by means of which the outside air volumetric flow can be swirled before it enters the mixing chamber. By means of such a mixing element, the above-described thorough mixing of the outside air volume flow with the circulating air volume flow is particularly easy to reach.

Furthermore, it is advantageous if the device according to the invention has a nozzle element arranged in the outside air duct, preferably adjoining the mixing space, by means of which an inflow depth of the outside air volume flow into the mixing space can be adjusted. In this way, the outside air volume flow can be adjusted so that it "deep" penetrates into the mixing chamber and thus ensures that it is well mixed with the circulating air volume flow. In particular, it is largely ruled out that at least part of the circulating air volume flow flows through the mixing space and leaves without having come into contact with the outside air volume flow, for example by the circulated air volume flow flows along a room boundary element of the mixing chamber, which faces away from an air inlet cross section of the outside air volume flow, that is far away from the inlet opening of the outside air volume flow. By means of the nozzle element it is ensured that the outside air volume flow, starting from an inlet opening into the mixing space, penetrates into the mixing space up to its "opposite end".

Advantageously, the outside air duct is connected to an air inlet cross section of the mixing space, which is arranged in a wall of the mixing space. That is, the outside air duct preferably does not protrude into the mixing space and thus avoids blocking or obstruction of an air flow flowing into the mixing space. The latter would result in an undesirable pressure drop in the mixing chamber. Consequently, it is advantageous if the outside air duct directly to the respective room boundary element, on the air inlet cross section is arranged, ends and this particular does not penetrate.

embodiments

The method described above and the device are explained in more detail below with reference to exemplary embodiments which are illustrated in the figures.

Fig. 1:

Ein Schema einer erfindungsgemäßen Vorrichtung,

Fig. 2:

Ein Schema einer weiteren erfindungsgemäßen Vorrichtung und

Fig. 3a - 3d:

Details eines Anschlusses eines Außenluftkanals an einen Mischraum.

It shows:

Fig. 1:

A diagram of a device according to the invention,

Fig. 2:

A diagram of another device according to the invention and

3a-3d:

Details of a connection of an outside air duct to a mixing room.

A first embodiment, which is in FIG. 1 1, an apparatus 1 according to the invention, comprising an outside air duct 2, a mixing chamber 3, an air conveyor 4, a clean room 5, a recirculating air duct 6, an air outlet surface 7 and two decentralized air conditioning modules 8, 9, wherein a first air conditioning module 8 from an electric heating and the second air conditioning module 9 are formed by a volumetric flow controller.

The outside air duct 2 is connected to a central air conditioning device 10 at an end facing away from the clean room 5 . This is adapted to be preconditioned by an outer region sucked outside air 11, typically filtered outside air, loaded or dehumidified and heated and / or cooled. Here, the air conditioning device 10 has two filter elements 12, an air conveyor 13, a heater 14 and a cooling register 15 . Air flowing in from the central air conditioning device 10 into the outside air duct 2 is referred to below as conditioned outside air 16 .

From the clean room 5 originating circulating air 17 is sucked by means of the air conveyor 4 from the clean room 5 and blown into the mixing chamber 3 . In this case, the circulating air 17 is filtered by means of a filter element 18 connected upstream of the air conveying device 4 . In addition to the circulating air 17 , the conditioned space outside air 16 is supplied to the mixing chamber 3 , which is conveyed by means of the air conveyor 13 of the central air conditioning device 10 . The circulating air 17 and the conditioned outside air 16 are mixed in the mixing chamber 3 to form mixed air 19 and flowing from the mixing chamber 3 into an air outlet space 20 . Starting from the air outlet space 20 , the mixed air 19 flows through the air outlet surface 7 into the clean room 5 , wherein the mixed air 19 is filtered again by means of a filter element 21 . In this way, the high demands on air purity that are placed on the clean room 5 , can be well maintained.

On a side facing away from the mixing chamber 3 of an air inlet cross-section 22 of the conditioned outside air 16 , a mixing element 23 is arranged in the outer air channel 2 in the form of a swirl element. This mixing element 23 causes an outside air volume flow formed by the conditioned outside air 16 to be swirled before it flows into the mixing space 3 , so that it has a turbulent flow characteristic. This turbulence is particularly suitable for achieving a good mixing of the conditioned outside air 16 with the circulated air 17 , so that a mixed air volume flow formed by the mixing air 19 is particularly homogeneous and, in particular, there are no local temperature differences in the mixed air volume flow.

By means of the device 1 according to the invention, it is particularly easy to influence a temperature in the clean room 5 independently of other clean rooms, which are also connected to a main branch 24 of the outside air duct 2 . This is achieved by means of the decentralized air conditioning module 8 and / or by means of the decentralized air conditioning module 9 , both of which are arranged in a secondary branch 25 of the outside air duct 2 , which is connected exclusively to the clean room 5. All state or quantitative changes of the outside air volume flow formed by the conditioned outside air 16 , which are caused by means of the air conditioning modules 8, 9 , therefore affect exclusively the clean room 5 . Other connected to the main branch 24 of the outside air duct 2 spaces are not affected by these changes.

The air conditioning module 8 in the form of the heating register can be used to change (again) a temperature of the conditioned outside air 16 after such a change has typically already taken place by means of the central air conditioning device 10 . The air conditioning module 9 in the form of the volumetric flow controller can finally be used to regulate an amount per time of the conditioned outside air 16 flowing into the mixing chamber 3 . Similarly to the use of the heating register, a temperature of the mixed air 19 is thus influenced indirectly by influencing a composition of the mixed air 19 from recirculated air 17 and conditioned outside air 16 .

Another device 1 ' according to the invention starts FIG. 2 out. In this case, the auxiliary branch 25 of the outside air duct 2 is fanned out into four individual ducts 26 , each of the individual ducts 26 being connected to its own mixing space 3 , in which the conditioned outside air 16 flowing in the individual ducts 26 is mixed with the circulated air 17 originating from the clean room 5 , All four mixing chambers 3 shown in this embodiment are connected to a four-part air outlet space 27 , which is designed as a modular TAV outlet for an operating room. In the secondary branch 25 of the outer air channel 2 , both a heating coil and a volumetric flow controller are arranged. All state and / or quantitative changes in the outside air volume flow from conditioned outside air 16 by means of the air conditioning modules 8, 9 have an effect on all four mixing chambers 3 , wherein all mixing chambers 3 are assigned to a clean room 5 , which is here formed by an operating room.

In the FIGS. 3a to 3d Different versions for the connection of the outside air duct 2 to the mixing chamber 3 are shown schematically. FIG. 3a shows the mixing element 23, which is arranged outside the mixing chamber 3 and causes a turbulence of the conditioned outside air 16 before it flows into the mixing chamber 3 . As already explained above, this results in a mixing effect of the circulated air 17 with the conditioned outside air 16 .

In order to increase a penetration depth of the outside air volume flow from conditioned outside air 16 into the mixing space 3 , the example according to FIG FIG. 3b the outside air channel 2 out through a wall 28 of the mixing space 2 into an interior of the mixing chamber. 3 In this way, it is ensured that the outside air volume flow completely opens up the mixing space 3 and that mixing with the circulating air 17 is ensured. However, the embodiment is disadvantageous insofar as the outside air channel 2 projecting into the mixing chamber 3 constitutes a flow obstacle for the air flow, so that an undesired pressure drop occurs in the mixing chamber 3 .

In order to avoid this disadvantage and nevertheless to achieve a high penetration depth of the outside air volume flow into the mixing space 3 , nozzle elements 29 according to the exemplary embodiment in FIG Figure 3c used. These have a reduced flow cross-section with respect to the air inlet cross-section 22, which connects the outside air channel 2 with the mixing chamber 3 . This leads to a flow velocity of the outside air volume flow increasing, as a result of which the penetration depth of the outside air volume flow into the mixing space is increased. Another variant for the design of nozzle elements 29 is 3d figure can be seen, here again the outside air duct 2 is guided into the mixing chamber 3 .

LIST OF REFERENCE NUMBERS

1, 1 '

contraption

2

Outdoor air duct

3

mixing room

4

Air conveyor

5

cleanroom

6

return air duct

7

Air outlet area

8th

Air conditioning module

9

Air conditioning module

10

Air conditioning unit

11

outside air

12

filter element

13

Air conveyor

14

heater

15

cooling coil

16

conditioned outside air

17

circulating air

18

filter element

19

mixed air

20

Air outlet space

21

filter element

22

Air inlet cross-section

23

mixing element

24

main branch

25

offshoot

26

Single channel

27

Air outlet space

28

wall

29

nozzle member

Claims (9)

Method for conditioning room air of a clean room (5), in particular an operating room, comprising the following method steps: a) outside air (11) is conditioned by means of a central air conditioning device (10), in particular filtered and / or sterilized and / or dehumidified or moistened and / or cooled or heated. b) Starting from the air conditioning device (10), conditioned outside air (16) is directed by means of at least one outside air duct (2) in the direction of at least one mixing chamber (3). c) By means of an air conveying device (4) from the clean room (5) originating circulating air (17) is conveyed by means of at least one recirculating air channel (6) in the mixing chamber (3). d) The conditioned outside air (16) and the circulated air (17) are mixed in the mixing space (3) to give mixed air (19). e) A mixed air volume flow formed by the mixed air (19) is conducted through at least one air outlet surface (7) into the clean room (5),
characterized by the following process step: f) An outside air volume flow formed by conditioned outside air (16) is heated by means of at least one decentralized air conditioning module (8), wherein the air conditioning module (8) is preferably formed by an electrical heating register. Method according to claim 1 or according to the preamble of claim 1,
characterized by the following process step: g) An outside air volume flow formed by conditioned outside air (16) is determined by means of at least one decentralized air conditioning module (9). quantitatively influenced, whereby an amount is regulated per time of the outside air volume flow flowing from the outside air duct (2) into the mixing space (3) and wherein the air conditioning module (9) is preferably formed by a volume flow regulator. Method according to claim 1 or 2, characterized in that the conditioned outside air volume flow (16) is swirled by means of a mixing element (23) arranged in the outside air duct (2), preferably adjoining the mixing space (3), so that the outside air volume flow at its entry into the mixing chamber (3) has a turbulent flow characteristic. Method according to one of Claims 1 to 3, characterized in that the conditioned outside air volume flow (16) is accelerated by means of a nozzle element (29) arranged in the outside air duct (2), preferably adjoining the mixing space (3), so that the outside air volume flow is as low as possible flows into the mixing chamber (3). Device (1, 1 ') for conditioning room air of a clean room (5), in particular an operating room, comprising at least one air conveyor (4) for conveying from the clean room (5) derived circulating air (17) in at least one mixing chamber (3) and at least an outside air duct (2) for conducting conditioned outside air (16) into the mixing space (3), wherein the outside air duct (2) is connected to a central air conditioning device (10) at an end facing away from the mixing space (3), by means of which outside air (11 ) can be conditioned, in particular filterable and / or sterilized and / or dehumidified or wetted and / or cooled or heated, wherein in the at least one mixing chamber (3) the conditioned outside air (16) with the circulating air (17) to mixed air (19) mixable is and the mixed air (19) via at least one air outlet surface (7) starting from the device (1, 1 ') in the clean room (5) can be conducted, characterized by at least one deze ntral air conditioning module (8) by means of which an outside air volume flow formed by the conditioned outside air (16) is heatable, wherein the air conditioning module (8) is preferably formed by an electrical heating coil. Device (1, 1 ') according to claim 5 or according to the preamble of claim 5, characterized by at least one decentralized air conditioning module (9), by means of which an outside air volume flow formed by the conditioned outside air (16) can be quantitatively influenced, wherein an amount per time of from the outside air duct (2) in the mixing chamber (3) inflowing outside air volume flow is regulated and wherein the air conditioning module (9) is preferably formed by a volume flow regulator. Device (1, 1 ') according to claim 5 or 6, characterized by a mixing element (23), preferably in the form of a swirl element, which in the outside air duct (2), preferably in an end portion of the outside air duct (2) facing the mixing space (3). , is arranged and by means of which the outside air volume flow before its entry into the mixing space (3) can be swirled. Device (1, 1 ') according to one of Claims 5 to 7, characterized by a nozzle element (29) arranged in the outer air channel (2), preferably adjoining the mixing chamber (3), by means of which an inflow depth of the outside air volume flow into the mixing chamber (3 ) is adjustable. Device (1, 1 ') according to any one of claims 5 to 8, characterized in that the outer air channel (2) is connected to an air inlet cross section (22) of the mixing chamber (3), which in a wall (28) of the mixing chamber (3). is arranged.

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