DE102012105364A1 - Method and device for conditioning room air of a clean room - Google Patents

Abstract

The invention relates to a 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 conveyor (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 from the mixed air (19) is passed through at least one air outlet surface (7) into the clean room (5). In order to bring about a possibility for individual temperature control of the room air of a clean room, it is proposed, inter alia, according to an outside air volume flow formed from conditioned outside air (16) and / or a circulating air volume flow formed from circulating air (17) and / or the mixed air volume flow by means of at least one decentralized air conditioning module (8 ), wherein the air conditioning module (8) is preferably formed from an electric heating coil. The invention further relates to a further method and two associated devices, by means of which the methods are particularly easy to implement.

Description

introduction

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

• 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.
• 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.
• 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.
• d) The conditioned outside air and the circulating air are mixed in the mixing space to mixed air.
• e) A mixed air volume flow formed from 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 room 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 to 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 wetted and / or cooled or heated, wherein in the at least one mixing chamber, the conditioned outside air with the circulating air Mixed air can be mixed 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 U1 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.

task

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

solution

• f) Ein aus Außenluft gebildeter Außenluftvolumenstrom und/oder ein aus Umluft gebildeter Umluftvolumenstrom und/oder der Mischluftvolumenstrom werden 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 from outside air and / or a circulating air volume flow formed from circulating air and / or the mixed air volume flow are heated by means of at least one decentralized air conditioning module, wherein the air conditioning module is preferably formed by an electric 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 and / or the recirculated air volume flow and / or the mixed air volume flow, which corresponds 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 such that outside air drawn in from outside is preconditioned 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 would be 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 and / or the recirculated air volume flow and / or the mixed air volume flow can be increased by means of the decentralized air conditioning module, whereby in all the procedure only one operating room is affected, which has a different temperature should have.

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 circulated air volume flow 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 in the present example amounts to T = 0.15 · 17 + 0.85 · 27.5 = 25.9 ° C, it being assumed 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. Alternatively, it is also conceivable to heat the circulating air volume flow and / or the mixed air volume flow mixed from the two air volume flows.

The heating of the respective air volume flows (outside air, circulating air, mixed air) by means of an electric 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 aus 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 aus einem Volumenstromregler gebildet ist.

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

• g) An outside air volumetric flow formed from 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 from 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 recirculated air is approximately 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 share of the mixed air volume flow is reduced to 10%, while the recirculation air volume flow is relatively increased, so that the mixed air flow rate remains quantitatively identical. 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 indicated possibility for heating outside air volume flow and / or recirculated air volume flow and / or mixed air volume flow or the quantitative influencing of the outside air volume flow, a combination of both methods is of course conceivable. Thus, for example, the circulating air volume flow could be heated while the outside air volume flow is increased in terms of volume. In this way, an outside air content in a single clean room can be increased independently of the other rooms connected to the central air treatment facility, however, due to the heating of the recirculating air volume flow, the temperature of the resulting mixed air volume flow can be maintained at the original level.

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 combined 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 space, 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 volume 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 in 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 this. 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-technical point of view, the underlying object is achieved by 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 from the conditioned outside air and / or a circulating air volume flow formed from the circulating air and / or a mixed air volume flow formed from the mixed air are heated, wherein the air conditioning module is preferably formed of an electric 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 achieved 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 from the conditioned outside air can be influenced in quantity, wherein an amount per time of the outside air volume flow flowing from the outside air duct into the mixing space can be regulated and wherein the air conditioning module is preferably is formed from a volume flow controller. As is clear above with reference to the method according to the invention described, the underlying object can be achieved both by means of the air conditioning module for heating outside air volume flow, circulating air volume flow and / or mixed air volume flow and alone by means of the air conditioning module for quantitatively influencing the outside air volume flow. Furthermore, a combination of both is conceivable.

The devices according to the invention should in any case advantageously have a mixing element, preferably in the form of a swirl element, which faces in the outside air duct, preferably in a mixing chamber End portion of the outside air duct, is arranged and by means of which the outside air volume flow can be swirled before it enters the mixing space. 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, the devices according to the invention should have a nozzle element which is arranged in the outside air channel and preferably adjoins the mixing space, by means of which an inflow depth of the outside air volume flow into the mixing space can be set. 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 should be 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 should preferably not "protrude" into the mixing space and block or obstruct an air flow of the air flowing in the mixing space. This would result in an undesirable pressure drop in the mixing chamber. Consequently, the outside air duct should end directly at the respective space delimiting element, on which the air inlet cross section is arranged, and in particular should not penetrate it.

embodiments

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

It shows:

1 : A scheme of a device according to the invention,

2 A scheme 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 1 is shown, shows a device according to the invention 1 comprising an outside air duct 2 , a mixed room 3 , an air conveyor 4 , a clean room 5 , a recirculation channel 6 , an air outlet surface 7 and two decentralized air conditioning modules 8th . 9 , wherein a first air conditioning module 8th from an electric heater and the second air conditioning module 9 are formed from a volumetric flow controller.

The outside air duct 2 is at a the clean room 5 remote end to a central air conditioning device 10 connected. This is suitable for outside air sucked in from outside 11 to condition, wherein typically the outside air is filtered, humidified or dehumidified and heated or cooled. Here is the air conditioning device 10 two filter elements 12 , an air conveyor 13 , a heating register 14 and a cooling coil 15 on. From the central air conditioning device 10 in the outside air duct 2 incoming air is considered conditioned outside air 16 designated.

Recirculating air from the clean room 17 is by means of the air conveyor 4 sucked out of the clean room and into the mixing room 3 blown. In this case, the circulating air by means of one of the air conveyor 4 upstream filter element 18 filtered. In addition to the circulating air 17 becomes the mixing room 3 furthermore the conditioned outside air 16 fed by means of the air conveyor 13 the central air conditioning device 10 is encouraged. The circulating air 17 and the conditioned outside air 16 be in the mixing room 3 to mixed air 19 mixed and flowing from the mixing chamber 3 in an air outlet space 20 above. Starting from the air outlet space 20 the mixed air flows 19 through the air outlet surface 7 in the clean room 5 one, where the mixed air 19 again by means of a filter element 21 is filtered. In this way, the high demands on air purity, the cleanroom 5 be well-kept.

On a the mixing room 3 opposite side of an air inlet cross section 22 the conditioned outside air 16 is in the outside air duct 2 a mixing element 23 arranged in the form of a swirl element. This mixing element 23 causes an outside air volume flow from the conditioned outside air 16 before it flows into the mixing chamber 3 is swirled so that it has a turbulent flow characteristic.

This turbulence is particularly suitable for a good mixing of the conditioned outside air 16 with the circulating air 17 to reach, so that one out of the mixed air 19 formed mixed air volume flow is designed to be particularly homogeneous and in particular no local temperature differences in the mixed air flow are present.

By means of the device according to the invention 1 it is particularly easy to have a temperature in the clean room 5 independent of other clean rooms, which also belong to one main branch 24 of the outside air duct 2 connected to influence. This is done by means of the decentralized air conditioning module 8th and / or by means of the decentralized air conditioning module 9 achieved, both in a side branch 25 of the outside air duct 2 are arranged exclusively with the clean room 5 connected is. All changes in the state or quantity of the conditioned outside air 16 outside air volume flow generated by the air conditioning modules 8th . 9 are caused, therefore, affect only the clean room 5 out. Further to the main branch 24 of the outside air duct 2 connected rooms are not affected by these changes.

The air conditioning module 8th in the form of the heating register can be used to a temperature of the conditioned outside air 16 (again) to change, after such a change is already typically by means of the central air conditioning device 10 took place. The air conditioning module 9 in the form of the volumetric flow controller can finally be used to a lot of time in the mixing room 3 incoming conditioned outside air 16 to regulate. By such an influence on a composition of the mixed air 19 from circulating air 17 and conditioned outside air 16 can therefore also a temperature of the mixed air 19 affects how this is possible by means of the heating register.

Another device according to the invention 1' comes from 2 out. In this is the secondary branch 25 of the outside air duct 2 in four single channels 26 fanned out, with each of the individual channels 26 to a separate mixing room 3 is connected, in which in the individual channels 26 flowing conditioned outside air 16 with the from the clean room 5 originating circulating air 17 is mixed. All four mixing spaces shown in this embodiment 3 are to a four-part air outlet space 27 connected as a modular TAV outlet for an operating room. In the side branch 25 of the outside air duct 2 Both a heating coil and a volumetric flow controller are arranged. All conditional and / or quantitative changes in outside air volume flow from conditioned outside air 16 by means of the air conditioning modules 8th . 9 affect all four mixing rooms 3 out, with all mixing rooms 3 a clean room 5 are assigned, which is formed here from an operating room.

In the 3a to 3d are different versions for the connection of the outside air duct 2 to the mixing room 3 shown schematically. 3a shows the mixing element 23 that outside the mixing room 3 is arranged and a turbulence of the conditioned outside air 16 causes, before this in the mixing room 3 flows. As already explained above, this results in a mixing effect of the circulating air 17 with the conditioned outside air 16 reached.

To a penetration depth of the outside air volume flow from conditioned outside air 16 in the mixing room 3 is to increase in the example according to 3b the outside air duct 2 through a wall 28 of the mixing room 2 into an interior of the mixing room 3 guided. In this way it is ensured that the outside air volume flow the mixing chamber 3 completely opens up and mixing with the circulating air 17 is ensured. However, the embodiment is disadvantageous insofar as that in the mixing room 3 protruding outside air duct 2 represents a flow obstruction to the airflow, causing an undesirable pressure drop in the mixing space 3 comes.

To avoid this disadvantage and still a high penetration depth of the outside air flow into the mixing chamber 3 should reach nozzle elements 29 according to the embodiment in 3c be used. These have a relative to the air inlet cross section 22 that the outside air duct 2 with the mixing room 3 connects, a reduced flow area on. 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 can be seen, here again the outside air duct 2 in the mixing room 3 is guided.

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

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3400487 A1 [0003, 0003]
• DE 202005000661 U1 [0004]

Claims (9)

Method for conditioning room air in a clean room ( 5 ), in particular an operating room, comprising the following method steps: a) outside air ( 11 ) 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 ) is conditioned outside air ( 16 ) by means of at least one outer air channel ( 2 ) towards at least one mixing room ( 3 ). c) by means of an air conveyor ( 4 ) is removed from the clean room ( 5 ) recirculating air ( 17 ) by means of at least one recirculating air channel ( 6 ) in the mixing room ( 3 ). d) The conditioned outside air ( 16 ) and the circulating air ( 17 ) are in the mixing room ( 3 ) to mixed air ( 19 ) mixed. e) One from the mixed air ( 19 ) formed by at least one air outlet surface ( 7 ) in the clean room ( 5 ), characterized by the following method step: f) conditioned air ( 16 ) formed outside air volume flow and / or from circulating air ( 17 ) recirculated air volume flow and / or the mixed air volume flow are by means of at least one decentralized air conditioning module ( 8th ), wherein the air conditioning module ( 8th ) is preferably formed by an electric heater. Method according to Claim 1 or according to the preamble of Claim 1, characterized by the following method step: g) A conditioned outside air ( 16 ) outside air volume flow is by means of at least one decentralized air conditioning module ( 9 ), wherein an amount per time of that of the outer air channel ( 2 ) in the mixing room ( 3 ) is regulated and the air conditioning module ( 9 ) is preferably formed from a volume flow regulator. Method according to claim 1 or 2, characterized in that the conditioned outside air volume flow ( 16 ) by means of a in the outside air duct ( 2 ), preferably at the mixing space ( 3 ) subsequent mixing element ( 23 ) is swirled, so that the outside air volume flow as it enters 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 ) by means of a in the outside air duct ( 2 ), preferably at the mixing space ( 3 ) adjoining nozzle element ( 29 ) is accelerated, so that the outside air volume flow as low as possible into the mixing chamber ( 3 ) flows in. Contraption ( 1 . 1' ) for the conditioning of room air of a clean room ( 5 ), in particular an operating room, comprising at least one air conveying device ( 4 ) for promotion from the clean room ( 5 ) recirculating air ( 17 ) in at least one mixing room ( 3 ) and at least one outside air duct ( 2 ) for the supply of conditioned outside air ( 16 ) in the mixing room ( 3 ), wherein the outside air duct ( 2 ) at a mixing room ( 3 ) facing away from a central air conditioning device ( 10 ) by means of which external air ( 11 ), in particular filterable and / or sterilizable and / or dehumidifying or moistenable and / or coolable or heatable, wherein in the at least one mixing chamber ( 3 ) the conditioned outside air ( 16 ) with the circulating air ( 17 ) to mixed air ( 19 ) is mixable and the mixed air ( 19 ) via at least one air outlet surface / 7 ) starting from the device ( 1 . 1' ) in the clean room ( 5 ), characterized by at least one decentralized air conditioning module ( 8th ), by means of which one of the conditioned outside air ( 16 ) formed outside air volume flow and / or one of the circulating air ( 17 ) recirculated air volume flow and / or one of the mixed air ( 19 ) are heated, wherein the air conditioning module ( 8th ) is preferably formed from an electric heater. Contraption ( 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 one of the conditioned outside air ( 16 ) outside air volume flow can be influenced quantitatively, wherein an amount per time of the of the outdoor air duct ( 2 ) in the mixing room ( 3 ) is adjustable and the air conditioning module ( 9 ) is preferably formed from a volume flow regulator. Contraption ( 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 a mixing chamber ( 3 ) facing end portion of the outer air channel ( 2 ), and by means of which the outside air volume flow before it enters the mixing chamber ( 3 ) is swirlable. Contraption ( 1 . 1' ) according to one of claims 5 to 7, characterized by a in the outside air duct ( 2 ), preferably at the mixing chamber ( 3 ) subsequent nozzle element ( 29 ), by means of which an inflow depth of the outside air volume flow into the mixing chamber ( 3 ) is adjustable. Contraption ( 1 . 1' ) according to one of claims 5 to 8, characterized in that the outside air duct ( 2 ) to an air inlet cross section ( 22 ) of the mixing space ( 3 ) connected in a wall ( 28 ) of the mixing space ( 3 ) is arranged.

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