Method and system for controlling an air parameter by means of a plurality of ventilation units

Abstract

The invention presents a method for controlling an air parameter within a room 100 by means of a plurality of ventilation units 10, 11, 12, wherein the method comprises, as steps, providing at least one first ventilation unit 11, which is configured to introduce a first airflow into a first sub-area 101 of the room 100, and a second ventilation unit 12, which is configured to introduce a second airflow into a second sub-area 102 of the room 100, controlling an air parameter K1 in the first sub-area 101 of the room 100 by adjusting at least one operating parameter B2; Q2 of the second ventilation unit 12, and providing a first interaction function f12; g12; h12, which changes the air parameter K1 to be controlled in the first sub-area 101 as a function of the at least one operating parameter B2; Q2 of the second ventilation unit 12 describes, includes, wherein the adjustment of at least one operating parameter B2;Q2 of the second ventilation unit 12 for controlling the air characteristic K1 in the first sub-area 101 depending on the provided first interaction function f12; g12; h12 is ready.;

Description

Technical area

[0001] The present invention relates to a method for controlling an air parameter within a room and a system for controlling an air parameter within a room by means of a plurality of ventilation units. Background of the invention

[0002] Maintaining a desired, predetermined state of the air in a room plays an important role in air conditioning. In order to achieve the most efficient procedure possible, this is associated with correspondingly high demands on the control of the devices used to air condition a room, especially in large rooms with a potentially large number of people in them, such as catering areas, lecture halls, classrooms or open-plan offices.

[0003] With regard to the most efficient air conditioning possible, the focus is on energy and economic aspects in the operation of the equipment used, the comfort-related perception of the people in the room and a reduction of the risk of infection potentially increased by a large number of people.

[0004] In the course of such air conditioning of a room, several ventilation units are often used, each of which introduces an air flow into the room in order to, for example, influence the air temperature in the room or to keep the germ load in the air below a certain limit, whereby the several ventilation units are usually operated simultaneously for collaborative air conditioning of the room.

[0005] For this purpose, for example, an air purification system with several ventilation units is known from the prior art in WO 2020 / 108667 A1, each of which detects a fine dust concentration in the environment associated with the respective ventilation unit and the several ventilation units are controlled depending on an average value of all detected fine dust concentrations.

[0006] The multiple ventilation units are usually installed at different positions within the room and can usually be repositioned in the room without much effort, even in the form of a mobile version.

[0007] For example, DE 11 2017 007 798 T5 discloses an air conditioning system that divides a room to be air-conditioned into a plurality of zones, each of which contains a ventilation device. The ventilation devices are controlled based on the presence detected in individual zones, taking into account the spatial distances between the zones.

[0008] Furthermore, WO 2020 / 110 185 A1 discloses a ventilation system in which several ventilation units in an area are controlled based on a ventilation volume required for the entire area.

[0009] The effects of air conditioning on the air in the room are largely unknown when using multiple ventilation units, some of which are placed randomly in the room, which in turn negatively affects the efficiency of the air conditioning. Summary of the invention

[0010] An object of the present invention is therefore to provide a possibility for more efficient air conditioning of a room by means of a plurality of ventilation units.

[0011] To achieve this object, a method for controlling an air characteristic within a room by means of a plurality of ventilation units according to claim 1 and a system for controlling an air characteristic within a room with a plurality of ventilation units according to claim 15 are proposed.

[0012] The respective dependent claims relate to preferred embodiments of the method according to the invention, which can each be provided individually or in combination.

[0013] According to a first aspect of the invention, a method is provided for controlling an air characteristic within a room by means of a plurality of ventilation units, the method comprising the steps of providing at least one first ventilation unit which is configured to introduce a first air flow into a first sub-area of ​​the room, and a second ventilation unit which is configured to introduce a second air flow into a second sub-area of ​​the room, controlling an air characteristic in the first sub-area of ​​the room by adjusting at least one operating parameter of the second ventilation unit, and providing a first interaction function which describes a change in the air characteristic to be controlled in the first sub-area caused by operation of the second ventilation unit as a function of the at least one operating parameter of the second ventilation unit.The adjustment of at least one operating parameter of the second ventilation unit for controlling the air characteristic in the first sub-area takes place depending on the provided first interaction function.

[0014] Sub-areas are understood to mean individual spatial areas of the room in the sense of a subset, each of which is not closed off from the rest of the room, such that it is in principle possible to transfer air from the first to the second sub-area (or vice versa) with the help of air flows within the room.

[0015] A combination of the first and second sub-areas does not necessarily encompass the entire room. Likewise, the first and second sub-areas do not necessarily have to be adjacent to each other, but can also be spaced apart from each other, with any number of additional sub-areas in between. The first and second ventilation units thus each direct at least one airflow into the same room.

[0016] An air parameter is any physical quantity that can be used to describe a state or a change in the state of the air within a room or within the respective sub-areas.

[0017] These may include, among other things, absolute quantities, such as a quantity or a concentration of a solid, liquid or gaseous component of the air, rates of change of the absolute quantities, such as a rate of change of said concentration over time, or integral means of the absolute quantities, such as a temporal and / or spatial mean of said concentration.

[0018] Said absolute quantities can include, among other things, a concentration or quantity (volume or mass) of oxygen, carbon dioxide, or nitrogen; a concentration or quantity of volatile organic compounds or an aerosol; a concentration, quantity, or size of solid particles; an air temperature, air pressure, or air humidity; whereby the above list is not intended to be exhaustive. The method according to the invention is in no way limited to controlling the air parameters mentioned above merely as examples.

[0019] Said concentrations can be specified in all usual ratios, for example as a volume ratio, as a mass ratio, as a density, as a number per volume or as a ratio of the number of particles.

[0020] An operating parameter of the ventilation unit can be understood as any parameter by which the operation of the ventilation unit can be described and / or which can be set on a control unit configured to control the ventilation unit.

[0021] For example, this can be a volume flow, an air temperature or a humidity of the air flow introduced by the ventilation unit, an electrical power of a fan provided for this purpose in the ventilation unit or, in the simplest case, a binary indication of an operating state in the form of "switched on" or "switched off".

[0022] An interaction function is any relation that, in order to describe a change in an air parameter to be controlled in a sub-area by operating a ventilation unit assigned to another sub-area, assigns elements of an arbitrarily designed output quantity to elements of an arbitrarily designed target quantity or maps them to these (see also Fig. 1 to 4B ). This can, for example, be an analytic function, a characteristic map, or a mapping table, which in particular map real numbers to one another in such a way that both the source and target sets are subsets of the real numbers.

[0023] The first interaction function describes the change in the air parameter to be controlled in the first sub-area due to operation of the second ventilation unit and thus provides information about the extent of an interaction between changes in the air parameter to be controlled in the first sub-area and operation of the second ventilation unit (hereinafter referred to simply as interaction).

[0024] An existing interaction within the meaning of the first interaction function is based on at least one air flow within the room caused by the operation of the second ventilation unit, which flows out of or into the first sub-area and thereby causes a change in the air characteristic in the first sub-area. However, if such an air flow cannot be generated by the operation of the second ventilation unit, no interaction exists.

[0025] The output set of an interaction function can, for example, in the case of the first interaction function, contain as elements discretely but also continuously distributed values ​​of the at least one operating parameter of the second ventilation unit, which are each assigned to elements of the target set. The elements of the output set are by no means limited to values ​​of the at least one operating parameter of the second ventilation unit, but can, for example, also contain values ​​of other operating parameters of the second ventilation unit and / or values ​​of operating parameters of other ventilation units and / or values ​​of the air parameter to be controlled from the first sub-area and / or values ​​of an air parameter from the second sub-area.

[0026] The elements of the target quantity, which in the case of the first interaction function each describe a change in the air characteristic in the first sub-area as a function of the at least one operating parameter of the second ventilation unit and thus provide information about the extent of the interaction, can also be distributed discretely or continuously.

[0027] In a particularly simple variant, the target quantity can contain two elements in the sense of a binary description, which either indicates whether the air parameter to be controlled in the first sub-area changes significantly due to operation of the second ventilation unit or not. Possible elements of the target quantity in this case could be the natural numbers "0" and "1", where "1" represents the case in which a significant change in the air parameter to be controlled in the first sub-area is to be expected due to operation of the second ventilation unit, and "0" represents the case in which no, or at least no significant, change is to be expected. With regard to the arrangement of the ventilation units in the room, the latter could be explained, for example, by the fact that the second air flow does not penetrate the first sub-area at all or only to a very limited extent due to local conditions.

[0028] The target quantity can also contain, as elements, values ​​of any physical quantities, their rates of change or integrals, but also time information about a period of change that is suitable for describing a change in the air parameter to be controlled, whereby the list is not to be understood as exhaustive.

[0029] In this sense, the target quantity of the interaction function does not necessarily have to contain the air parameter to be controlled as a physical quantity. For example, a change in the air parameter to be controlled in the first sub-area due to the operation of the second ventilation unit could also be described by information contained in the target quantity regarding the percentage of the second air flow flowing from the second sub-area into the first sub-area. This would describe an input flow into the first sub-area with ideally known state variables, which mixes with the air in the first sub-area and thus leads to a change in the air parameter to be controlled there.

[0030] The method according to the invention provides a particularly efficient way of controlling the air parameter in the first sub-area of ​​the room, which is carried out by utilizing knowledge of the interaction between the air parameter to be controlled and the operation of the second ventilation unit, which does not introduce an air flow directly into the first sub-area.

[0031] The precise relationship between the mutual influence of several ventilation units during the air conditioning of a room is unknown in the methods known from the prior art, e.g. from WO 2020 / 108667 A1, which can potentially lead to disadvantageous control processes, since, for example, collaborative operation of two ventilation units is started even though this offers no added value compared to operation with just one ventilation unit, or is even disadvantageous in terms of a cost-benefit ratio, e.g. in view of the increased energy consumption. This can be caused, for example, by the fact that an air flow from one ventilation unit does not penetrate into the vicinity of the other ventilation unit, or only to a very small extent, due to the arrangement of furnishings in the room.

[0032] By providing the first interaction function, such a knowledge gap about the mutual influence of several ventilation units is filled and thus allows more efficient procedures for controlling the air parameter in the first sub-area.

[0033] The method thus creates the possibility of collaborative operation of at least two ventilation units by utilizing the knowledge of said mutual influence, whereby the individual ventilation units can be controlled particularly efficiently in order, for example, to correct a deviation of the air parameter to be controlled from a desired value as quickly as possible and at the same time to minimize energy consumption, noise pollution or mechanical stress on the ventilation units.

[0034] In a preferred embodiment, the step of controlling the air characteristic in the first sub-area further comprises the sub-steps of specifying a target value of the air characteristic to be controlled in the first sub-area and detecting an actual value of the air characteristic to be controlled in the first sub-area, wherein the adaptation of the at least one operating parameter of the second ventilation unit for controlling the air characteristic in the first sub-area additionally takes place as a function of the specified target value and the detected actual value.

[0035] In this way, the method according to the invention is extended to a control method in the course of which the air parameter to be controlled in the first sub-area, which in this case corresponds to an air parameter to be controlled, is controlled as a function of the actual and target values, whereby a difference between the two values ​​is usually decisive.

[0036] The actual value can be recorded by measuring the air parameter to be controlled or, in this case, regulated at one or more positions in the first sub-area, in particular by means of one or more recording devices on the first ventilation unit or in the vicinity of the first ventilation unit. The recorded actual value preferably corresponds to an average of the measured values ​​of the air parameter measured at the one or more positions in the first sub-area.

[0037] In a preferred embodiment, the step of controlling the air parameter in the first sub-area is carried out subject to one or a combination of several of the following objectives: Minimizing a deviation between the actual value and the target value of the air parameter to be controlled in the first sub-area; minimizing a duration required to achieve a minimum deviation between the actual value and the target value of the air parameter to be controlled; minimizing an operating noise level of the first and / or second ventilation unit; maximizing a service life of parts of the first and / or second ventilation unit, in particular of wearing parts.

[0038] The deviation is to be understood as a deviation in amount that must be minimized.

[0039] In this way, not only is an energetically and economically efficient control of the air parameter in the first sub-area possible, but the comfort-related perception of people in the room is also improved, since, for example, the air parameter to be controlled itself reaches its target value more quickly or the noise pollution caused by the large number of ventilation units is reduced.

[0040] For example, taking advantage of the knowledge of the interaction in the latter case, it might be advantageous to operate the first and second ventilation units at half capacity instead of operating the first ventilation unit at full load, provided that this allows the same desired target value for the air parameter to be controlled to be achieved in the first sub-area. Such an approach not only reduces noise pollution but also increases the service life of the individual ventilation units, since, as described in the example, they do not necessarily have to be operated at full load.

[0041] In In a preferred embodiment, the step of controlling the air characteristic in the first sub-area is additionally carried out by adjusting at least one operating parameter of the first ventilation unit.

[0042] In this way, the method according to the invention has more actuators available for controlling the air parameter in the first sub-range, whereby the control itself can be further improved.

[0043] In a preferred embodiment, a predefined interaction function is provided in the step of providing the first interaction function.

[0044] In this way, an interaction known from similar arrangements in other rooms can be provided and updated if necessary.

[0045] In a preferred embodiment, the step of providing the first interaction function comprises the step of determining the first interaction function with the following sub-steps: detecting an initial value of an air parameter selected for determining the first interaction function in the first sub-area at a first point in time, introducing the second air flow through the second ventilation unit, detecting a further value of the air parameter selected for determining the first interaction function in the first sub-area at a further, later point in time, and determining the first interaction function on the basis of the detected initial value and the detected further value of the air parameter selected for determining the first interaction function in the first sub-area.

[0046] In this way, the first interaction function can be determined directly in a final arrangement of the ventilation units in the room, in such a way that, among other things, room-specific conditions such as furnishings, distance between the installation locations of the ventilation units, introduction directions of the air flows, room shape, etc. are taken into account accordingly.

[0047] This is particularly advantageous for mobile ventilation units, since their installation location is inherently unknown and may also change under certain circumstances. Thus, the interaction is inherently unknown or may change, e.g., when a ventilation unit is repositioned. These unfavorable circumstances for controlling the air parameter are advantageously counteracted by the described step of determining the first interaction function.

[0048] This provides a smart control method for controlling an air parameter within the room by means of a large number of ventilation units, which, in the course of the described step, learns, among other things, to detect inherently unknown conditions of the room and to take them into account accordingly when controlling.

[0049] The air parameter selected to determine the first interaction function in the first sub-range can be any air parameter, as long as it provides some information about the interaction with the air parameter to be controlled. For example, if a carbon dioxide concentration is selected as the air parameter to determine the first interaction function, this also provides (at least some) information about changes in an exemplary oxygen concentration to be controlled.

[0050] In particular, the air parameter selected to determine the first interaction function in the first sub-area is the air parameter to be controlled in the first sub-area.

[0051] In a preferred embodiment, the step of determining the first interaction function further comprises detecting a temporal value profile of the air parameter selected for determining the first interaction function in the first sub-area, and the sub-step of determining the first interaction function is additionally carried out on the basis of the detected temporal value profile, in particular on the basis of an integral mean and / or on the basis of an extreme value of a rate of change of the detected temporal value profile.

[0052] In a preferred embodiment, the step of determining the first interaction function further comprises providing the at least one operating parameter of the second ventilation unit and optionally providing the at least one operating parameter of the first ventilation unit, wherein the sub-step of determining the first interaction function is additionally carried out on the basis of the provided operating parameter or the provided operating parameters.

[0053] In this way, a more precise specification of the first interaction function can be made depending on several output variables, which in turn enables a more efficient control of the air parameter in the first sub-range, since a wider spectrum of possible constellations of air parameter and operating parameter(s) is available as the output quantity.

[0054] In a preferred embodiment, the first interaction function is determined when the first ventilation unit is switched off.

[0055] Preferably, the first interaction function can also be determined when the first ventilation unit is switched on.

[0056] Preferably, the step of determining the first interaction function comprises introducing a tracer gas with which the second air stream is enriched. A tracer gas (or test gas, for example, carbon dioxide) is particularly easy to detect and thus allows for rapid and reliable determination of the first interaction function.

[0057] In a preferred embodiment, a value of the interaction function can lie at least in a first or in a second value range, wherein in the step of controlling the air characteristic in the first sub-range, the at least one operating parameter of the second ventilation unit is switched on and / or adjusted if the value of the interaction function lies in the first value range and a value of the air characteristic to be controlled in the first sub-range exceeds a first limit value, and / or if the value of the interaction function lies in the second value range and the value of the air characteristic to be controlled in the first sub-range exceeds a second limit value.

[0058] In this way, a multi-stage support operation can be provided which, depending on the extent of the interaction, which is defined by the respective value ranges, provides support for the control of the air parameter in the first sub-area by the second ventilation unit only after a critical limit value has been exceeded.

[0059] For example, the first value range can encompass cases of weak to moderate interaction, whereas the second value range encompasses cases of high interaction. In the case of high interaction, it would be advantageous to keep the second ventilation unit switched on at all times to support the control of the air parameter in the first sub-area, thus providing "basic" support. In the case of weak to moderate interaction, however, it would be advantageous to switch the second ventilation unit on or off only to prevent the first ventilation unit from operating at full load, thus providing "conditional" support.

[0060] In a preferred embodiment, the air parameter to be controlled in the first sub-area is one of the following variables: a concentration or quantity of volatile organic compounds; a concentration or quantity of carbon dioxide; a concentration or quantity of oxygen; a concentration or quantity of aerosols; a size or concentration or quantity of solid particles; an air temperature; or a humidity.

[0061] However, the method according to the invention is in no way limited to the sizes listed above.

[0062] Preferably, the air parameter to be controlled in the first sub-area is a combination of two or more of the previously listed parameters.

[0063] In this way, several air parameters can be controlled simultaneously in the first sub-area in the form of a common air parameter, with prioritization achieved by weighting the combination. For example, the air parameter in question could be a combination of air temperature, carbon dioxide concentration, and volatile organic compound concentration, each weighted at 30%, 20%, and 50%, respectively. Thus, controlling the volatile organic compound concentration would have the highest priority.

[0064] In a preferred embodiment, the provided first interaction function is updated at time intervals during the control of the air parameter in the first sub-area, in particular at periodic time intervals or continuously.

[0065] In this way, during the control of the air parameter, it is possible to react to changes in the boundary conditions that would influence the interaction, e.g. changing number of people in the room, open window, etc., without having to record such information directly, since their influence is taken into account accordingly in the course of updating the first interaction function.

[0066] The interaction function is preferably updated by repeating the described step of determining the first interaction function.

[0067] In a preferred embodiment, at least the first or the second ventilation unit is operated in a source air mode in which the introduction of the respective air flow takes place with the proviso of forming a fresh air lake adjacent to a floor surface of the room.

[0068] In this way, air conditioning of the room using the source air principle is made possible, which is particularly suitable for use in classrooms or lecture halls. In the process, accumulating fresh air collects at the floor of the room, the so-called fresh air lake, and each person draws their individually required amount of air directly from the fresh air lake. This air is drawn from the floor directly into the person's breathing zone by the body's own buoyancy flow, and exhaled air with aerosols and the like rises to the ceiling and thus does not reach the breathing zone of other people.Such a principle is particularly advantageous in combination with the provision of the first interaction function according to the invention, since the interaction also takes into account the effects of the fresh air lake formed, which, compared to a mere circulation of the air, is particularly advantageous in the said use in classrooms or lecture halls, for example in order to control a concentration of volatile organic compounds particularly efficiently.

[0069] In a preferred embodiment, values ​​of the air parameter to be controlled in the first partial area are detected by at least one detection device of the first ventilation unit, which is arranged in a lower area of ​​the first ventilation unit, wherein the lower area is adjacent to the floor area or faces it, such that the detection device can detect the presence of a fresh air lake.

[0070] In this way, the control of the air parameter in the first sub-area is improved even when using the displacement air mode, as it is ensured that an existing fresh air pool is also detected and taken into account accordingly during the process, which would be more difficult, for example, with a detection device arranged on top of the ventilation unit, as the fresh air pool might not reach that point.

[0071] In a preferred embodiment, at least the first or the second ventilation unit is operated in a fresh air mode in which fresh outside air from an environment separated from the room is proportionally added to the respective air flow or the respective air flow consists entirely of fresh outside air.

[0072] In this way, in contrast to a recirculation mode, which merely circulates the air present in the room, it is possible to supply the room with fresh and usually less polluted outside air, which is particularly advantageous in order to increase an oxygen concentration or to reduce a carbon dioxide concentration in the room in the course of the method according to the invention.

[0073] In a preferred embodiment, at least the first or the second air stream is cleaned before being introduced into the respective sub-area, in particular in such a way that volatile organic compounds and / or solid particles and / or other contaminants are removed from the respective air stream.

[0074] In a particularly preferred embodiment, the method additionally comprises the step of recording room data, and the step of controlling the air parameter in the first sub-area is additionally carried out as a function of the recorded room data, wherein the room data comprises one or more of the following information: a number of persons present within the room; a position and / or movement of at least one person present within the room; a spatial distance between the installation locations of the first and second ventilation units; dimensions of the room.

[0075] In this way, additional boundary conditions in the form of the previously listed information can be specifically considered when controlling the air quality parameter in the first sub-area. In particular, the method can take into account person-specific information, which, for example, can increase the airflow when the room is particularly busy and reduce it when the room is empty.

[0076] In a preferred embodiment, the method further comprises the steps of providing a second interaction function which describes a change in an air characteristic to be controlled in the second sub-area of ​​the room as a function of the at least one operating parameter of the first ventilation unit, and controlling the air characteristic in the second sub-area of ​​the room by adapting the at least one operating parameter of the first ventilation unit and / or the at least one operating parameter of the second ventilation unit as a function of the provided second interaction function.

[0077] In this way, the method according to the invention is extended to several sub-areas of the room, so that a more efficient control of an air parameter is also possible there.

[0078] Preferably, the method comprises providing N ventilation units, each of which is configured to introduce an Nth air flow into an Nth sub-area, providing a plurality of interaction functions, each of which changes an air parameter to be controlled in a specific sub-area depending on one or more operating parameters of one or more ventilation units that are not assigned to the specific sub-area, and controlling an air parameter in the specific sub-area of ​​the room by adapting the one or more operating parameters of the one or more ventilation units depending on the plurality of interaction functions provided.

[0079] In this way, the method is extended for use with a complex network of ventilation units, with which an air parameter in a single part of the room can be controlled in a targeted and, above all, efficient manner through collaborative operation of any number of other ventilation units, utilizing the multitude of interaction functions provided.

[0080] This advantageous further development is by no means limited to the specific sub-area, but can provide a multitude of interaction functions for each sub-area, whereby air parameters in each sub-area are controlled depending on the respective multitude of interaction functions.

[0081] According to a second aspect of the invention, a system for controlling an air parameter within a room is provided, which system comprises at least a first ventilation unit which is configured to introduce a first air flow into a first sub-area of ​​the room, and a second ventilation unit which is configured to introduce a second air flow into a second sub-area of ​​the room, and a control device which is coupled at least to the second ventilation unit and which is configured to adapt at least one operating parameter of the second ventilation unit via control commands and thus to control an air parameter to be controlled in the first sub-area of ​​the room.The control device is further configured to adapt the at least one operating parameter of the second ventilation unit as a function of a first interaction function provided in a memory device of the control device, which first interaction function describes a change in the air parameter to be controlled in the first sub-area caused by an operation of the second ventilation unit as a function of the at least one operating parameter of the second ventilation unit.

[0082] The system according to the second aspect thus allows the implementation of the method for controlling an air parameter within a room according to the first aspect of the invention with all the previously described advantages of more efficient control of the air parameter.

[0083] Preferably, the control device is further coupled to the first ventilation unit and configured to adapt at least one operating parameter of the first ventilation unit via control commands.

[0084] Preferably, the first ventilation unit comprises a detection device configured to detect an air parameter selected for determining the first interaction function in the first sub-area, wherein the control device further comprises an evaluation unit configured to receive from the detection device an initial value of the air parameter selected for determining the first interaction function in the first sub-area at a first point in time and a further value of the air parameter selected for determining the first interaction function at a further, later point in time, and to determine the first interaction function on the basis of the received initial value and the received further value, and to store this in the memory device of the control device for provision.

[0085] Preferably, the detection device is configured to detect a temporal value profile of the air parameter selected for determining the first interaction function in the first sub-area and to transmit it to the evaluation unit, wherein the evaluation unit is configured to additionally determine the first interaction function on the basis of the transmitted value profile, and / or the evaluation unit is configured to receive the at least one operating parameter of the second ventilation unit and optionally also the at least one operating parameter of the first ventilation unit, and to additionally determine the first interaction function on the basis of the received operating parameter or the received operating parameters.

[0086] Preferably, at least the first or the second ventilation unit is configured to be operated in a source air mode, in which the introduction of the respective air flow takes place in such a way that a fresh air lake is formed adjacent to a floor surface of the room.

[0087] Preferably, the detection device of the first ventilation unit is arranged in a lower region of the first ventilation unit such that it is adjacent to the floor surface of the room or at least faces it in order to be able to detect the presence of a fresh air lake.

[0088] Preferably, the first or the second ventilation unit comprises a fresh air device which is designed to add air from an environment separated from the room in proportion to the respective air flow as fresh outside air or to generate the respective air flow entirely from this.

[0089] Preferably, at least the first or the second ventilation unit comprises an air purification device which is designed to purify the respective air flow before it is introduced into the respective sub-area and, in particular, to remove volatile organic compounds and / or solid particles and / or other contaminants from the respective air flow.

[0090] Preferably, at least the first or the second ventilation unit comprises a temperature control device which is configured to adjust a temperature and / or a humidity of the respective air flow before it is introduced into the respective sub-area.

[0091] Preferably, the control device is designed as part of the first or as part of the second ventilation unit or is provided separately as a central control device.

[0092] In this way, the control device configured for collaborative operation of the ventilation units can be provided centrally or decentrally. For example, the problem of a potentially limited range of a wireless connection from a control device of a ventilation unit to other ventilation units can be resolved by using a centrally located control device within whose wireless connection range all ventilation units are located.

[0093] On the other hand, the design with a control device designed as part of the ventilation unit offers the advantage, for example, that no additional central control device needs to be provided as another component that might take up space.

[0094] Preferably, the control device is wirelessly coupled to the first and / or second ventilation unit. This eliminates the need for additional cables, which, among other things, makes it very easy to integrate additional ventilation units into the system and, on the other hand, allows mobile ventilation units to be positioned anywhere within the room.

[0095] A further aspect of the invention is the provision of a ventilation unit as a first or second ventilation unit for a system according to the second aspect of the invention.

[0096] A further aspect of the invention is to provide a control device for a system according to the second aspect of the invention.

[0097] Further aspects and their advantages as well as more specific embodiments of the aforementioned aspects and features are described below with the aid of the drawings shown in the attached figures: Fig. 1A to Fig. 1D show examples of possible first interaction functions for use in a method according to the first aspect of the invention as a function of a volume flow of the second ventilation unit. Fig. 2 shows an example of a possible first interaction function for use in a method according to the first aspect of the invention depending on an operating state of the second ventilation unit. Fig. 3A and Fig. 3B show exemplary time courses of an air parameter in the first sub-area for determining the first interaction function. Fig. 4A and Fig. 4B show exemplary time courses of the air parameter to be controlled in the first sub-area. Fig. 5 shows an exemplary flowchart of an embodiment of the method according to the first aspect of the invention. Fig. 6 and Fig. 7 show embodiments of the system according to the second aspect of the invention,

[0098] Identical or similar elements in the figures may be designated by the same reference symbols, but sometimes also by different reference symbols.

[0099] It is emphasized that the present invention is in no way limited to the exemplary embodiments described below and their implementation features. The invention further encompasses modifications of the aforementioned exemplary embodiments, in particular those resulting from modifications and / or combinations of individual or multiple features of the described exemplary embodiments within the scope of the independent claims. Detailed character description

[0100] Fig. 1A to Fig. 1Dshow exemplary representations of possible first interaction functions f 12 ; g 12 ; h 12 for use in a method according to the first aspect of the invention, which describe a change in an air characteristic K 1 to be controlled in a first sub-area of ​​a room, inter alia, as a function of an operating parameter corresponding to the volume flow Q 2 of a second ventilation unit.

[0101] The volume flow Q 2 is usually given in cubic metres per hour or litres per second, where Fig. 1A to Fig. 1D specific values ​​of the volume flow Q 2 of the second ventilation unit are designated λ and λ i respectively.

[0102] The first interaction functions f 12 ; g 12 ; h 12 also depend partly on an air parameter K 1 to be controlled in the first sub-area, where in the Fig. 1A to Fig. 1D specific values ​​of the air parameter K 1 to be controlled are designated A, B and C.

[0103] The first interaction functions f 12 ; g 12 ; h 12 describe the extent of an interaction between changes in the air parameter K 1 to be controlled in the first sub-area and the operation of the second ventilation unit, which in this case is determined by the volume flow Q 2. Values ​​of the first interaction functions f 12 ; g 12 ; h 12 can, for example, be directly related to the Fig. 3A and 3B shown sizes.

[0104] Fig. 1A shows an example of a first interaction function f 12 , which depends on a current value of the air parameter K 1 to be controlled in the first sub-area and on the volume flow Q 2 of the second ventilation unit, plotted against said volume flow Q 2 .

[0105] The higher the value of the first interaction function f 12 , the greater the change in the air parameter K 1 to be controlled in the first sub-range. For a volume flow Q 2 =0, there is no change in the air parameter K 1 to be controlled in the first sub-range, whereas for increasing values ​​λ 1 , λ 2 , λ 3 , λ 4 , λ 5 of the volume flow Q 2 , there are greater changes in the air parameter K 1 to be controlled in the first sub-range.

[0106] Depending on the current value A, B or C of the air parameter K 1 to be controlled in the first sub-range, a change in the said air parameter K 1 can occur to varying degrees at the same volume flow Q 2.

[0107] If, for example, the air parameter K 1 to be controlled is a concentration of carbon dioxide which is to be reduced by means of the method according to the invention, then for an initially comparatively high concentration of carbon dioxide (exemplarily given by K 1 =C) with the same volume flow Q 2, a stronger change in the concentration of carbon dioxide in the first sub-area can be implemented than would be the case for an initially comparatively low concentration of carbon dioxide (exemplarily given by K1=A or K 1 =B).

[0108] Fig. 1B shows an alternative, three-dimensional representation of the Fig. 1A shown exemplary courses of the first interaction function f 12 , where in comparison to the Fig. 1A two additional curves each for a value of the air parameter K 1 to be controlled between the values ​​A and B and between the values ​​B and C.

[0109] Fig. 1C shows an example of a further first interaction function g 12 with discrete distribution over the values ​​0, λ 1 to λ 5 of the second volume flow Q 2 .

[0110] The first interaction function g 12 can take the values ​​"0" and "1", where "0" covers the cases of no or only a weak interaction and "1" the cases of a medium to strong interaction.

[0111] Based on the discrete distribution shown in Fig. 1C For example, the volume flow Q 2 of the second ventilation unit is adjusted directly to one of the values ​​λ 3 to λ 5 during the control of the air parameter K 1 in the first sub-area, since these values, according to the first interaction function, would lead to a corresponding change in the air parameter K 1 to be controlled in the first sub-area. In contrast, adjusting to one of the values ​​λ 1 or λ 2 would be unlikely.

[0112] The first interaction function g 12 is based on the exemplary course of the first interaction function f 12 from Fig. 1A for the case K 1 =C, where for values ​​of f 12 (K 1 =C) above the Fig. 1A shown limit F 12, the first interaction function g 12 is assigned the value "1", whereas for values ​​that are below the limit F 12, the first interaction function g 12 is assigned the value "0".

[0113] The discretely distributed first interaction function g 12 contains, in comparison to the other interaction functions in the Fig. 1A, 1B and 1D a small amount of information regarding the interaction, but is characterized by good clarity and less storage space when stored in a storage device of a control device configured to carry out the method according to the invention.

[0114] Fig. 1Dshows an example of a further first interaction function h 12 , represented as a characteristic map over the air parameter K 1 to be controlled and the volume flow Q 2 of the second ventilation unit.

[0115] In contrast to the Fig. 1B The interaction function shown is represented as a characteristic map in Fig. 1D as a surface whose height above a base point determined by values ​​of K 1 and Q 2 indicates a measure of the change in the air parameter to be controlled due to operation of the second ventilation unit. In this way, a corresponding value of the interaction function h 12 can be directly specified for any constellation of K 1 and Q 2.

[0116] Fig. 2 shows an example of another first interaction function f 12 , which, in contrast to the interaction functions from the Fig. 1A to 1Ddoes not depend on the volume flow of the second ventilation unit, but on a current value of an operating state B 2 (as an operating parameter) of the second ventilation unit, for example in a case in which a volume flow of the second ventilation unit is not adjustable but remains constant at a nominal value.

[0117] The operating state B 2 indicates whether the second ventilation unit is switched on (value "1") and an air flow is introduced into the second sub-area, or whether the second ventilation unit is switched off (value "0").

[0118] Fig. 3A shows an exemplary time course of an air parameter L 1 in the first sub-area over time t in response to an adjustment of the volume flow Q 2 of the second ventilation unit from the value 0 to the value λ, which can be used to determine the first interaction function.

[0119] The air characteristic L 1 is an air characteristic selected to determine the first interaction function, which can optionally also correspond to the air characteristic to be controlled.

[0120] At time t 0 , the second ventilation unit is switched on and the volume flow Q 2 of the air flow s introduced into the second sub-area by the second ventilation unit is adjusted to the value λ>0.

[0121] In response to the start of operation of the second ventilation unit, the air parameter L 1 decreases from the initial value L 1 (t=t 0 ) over a period of time T to a stationary value L 1 .

[0122] The initial value L 1 (t=t 0 ) can, for example, correspond to a stationary value caused by a stationary operation of the first ventilation unit, which can be further reduced by the support of the operation of the second ventilation unit.

[0123] To determine the first interaction function, various relations and quantities from the time curve shown can be used. For example, the extent of the interaction at a volume flow rate Q 2 =λ can be determined based on the time T required to reach the steady state L 1 , based on the difference L 1 (t=t 0 )-L 1 , or based on the hatched area, which corresponds to the integral I according to Equation 1. I = ∫ t 0 t 0 + T L 1 t − L ¯ 1 Q 2 = λ dt

[0124] Fig. 3B shows an exemplary time course of a temporal change rate dL 1 / dt of the air characteristic L 1 in the first sub-area over time t in response to an adjustment of the volume flow Q 2 of the second ventilation unit from the value 0 to the value λ, which can be used to determine the first interaction function, whereby the shown course of the time derivatives of the course of the air characteristic L 1 from Fig. 3A corresponds.

[0125] The temporal rate of change dL 1 / dt decreases from the value 0 to the extreme value min(dL 1 / dt), which corresponds to a local minimum, and then approaches the value 0 again, which corresponds to the Fig. 3A shown stationary state is reached with the value L 1.

[0126] To determine the first interaction function, alternatively or in addition to the time course, Fig. 3A The extreme value min(dL 1 / dt) can also be used to determine the maximum rates of change that can be achieved by operating the second ventilation unit.

[0127] Fig. 4A shows two exemplary time courses of the air parameter K 1 to be controlled in the first sub-area, which describe the cases of stationary operation of the first ventilation unit with a volume flow Q 1 =v on the one hand with and on the other hand without support from the second ventilation unit.

[0128] When the second ventilation unit is switched off (Q 2 = 0), the air parameter K 1 to be controlled only reaches a comparatively higher steady-state value K 1 than when supported by the second ventilation unit (Q 2 = λ). Thus, a significant change in the air parameter K 1 to be controlled occurs due to the operation of the second ventilation unit, which can be described by a first interaction function in the sense of the method according to the invention.

[0129] Using said first interaction function, a particularly efficient control of the air parameter K 1 can be implemented, for which an exemplary time course is shown in Fig. 4B is shown, in which the air parameter K 1 is to reach the stationary value K 1 (Q 2 =0) as the target value and the first ventilation unit is operated constantly at a volume flow Q 1 =v.

[0130] Starting from the initial actual value K 1 (t=t 0 ), the volume flow Q 2 of the second ventilation unit is adjusted to the value λ at time t=t 0 and reset to the value 0 at time t=t 1 . By adjusting the volume flow Q 2 of the second ventilation unit, the target value is reached significantly faster than in the case also shown with the second ventilation unit constantly switched off (Q 2 (t)=0). The second ventilation unit is thus advantageously used to control the air parameter K 1 in the first sub-area by utilizing the first interaction function.

[0131] Fig. 5shows an exemplary flow chart of an embodiment of the method according to the first aspect of the invention with the steps S1 to S8, wherein the method is constructed in the sense of a control method and the air characteristic to be controlled in the first sub-area thus corresponds to an air characteristic to be controlled in the first sub-area.

[0132] In step S1, a first ventilation unit for introducing a first air flow into a first sub-area of ​​a room and a second ventilation unit for introducing a second air flow into a second sub-area of ​​the room are provided.

[0133] The introduction of the respective air flows takes place with regard to a characteristic of the air within the room to be controlled, in particular in the first sub-area, by adjusting one or more operating parameters of the ventilation units.

[0134] In step S2, a first interaction function is determined and subsequently provided, wherein the first interaction function describes a change in the air parameter to be controlled or, in this case, regulated in the first sub-area as a function of at least one operating parameter of the second ventilation unit.

[0135] In this way, information about an extent of an interaction between changes in the air parameter to be controlled in the first sub-area and an operation of the second ventilation unit is provided to the method according to the invention, thus enabling a particularly efficient control of the air parameter in the first sub-area.

[0136] The following steps S3 to S8 form the actual control, in which the adjustment of manipulated variables for controlling the air parameter to be controlled in the first sub-range takes place taking into account a deviation between a current actual value and a specified target value of the air parameter to be controlled in the first sub-range.

[0137] In step S3, a target value of the air parameter to be controlled is provided in the first sub-area.

[0138] In step S4, an actual value of the air parameter to be controlled is recorded in the first sub-range.

[0139] In step S5, the actual value and the target value of the air parameter to be controlled are compared with each other. In the event of a deviation between the actual value and the target value (taking into account a specified tolerance), step S6 is initiated and in the event of no deviation, step S8 is skipped.

[0140] In step S6, the at least one operating parameter of the second ventilation unit is adjusted, which in the underlying exemplary embodiment corresponds to the volume flow of the air flow introduced by the second ventilation unit, wherein the adjustment is carried out as a function of the deviation between the actual and target value and as a function of the first interaction function.

[0141] After adjusting the volume flow at the second ventilation unit, a new actual value of the air parameter to be controlled in the first sub-area is recorded in step S7, which is compared with the provided target value during a repetition of step S5.

[0142] If a deviation still exists, steps S6 to S7 are repeated until the actual value corresponds to the target value, taking into account the specified tolerance, whereupon step S8 follows, during which actual values ​​of the air parameter to be controlled are repeatedly recorded in the first sub-range at regular intervals.

[0143] Based on the recorded actual values, steps S5 to S8 are repeated according to the Fig. 5 shown flowchart.

[0144] Fig. 6 shows an embodiment of the system according to the second aspect of the invention with a first ventilation unit 11 and a second ventilation unit 12, which are each configured to introduce an air flow into the first sub-area 101 and into the second sub-area 102.

[0145] The sub-areas 101, 102 do not directly border one another and are arranged at different positions within the room 100.

[0146] The second ventilation unit comprises a control device (not shown) which, in the exemplary embodiment shown, is designed to adapt a volume flow of the air flow of the second ventilation unit 12 as a function of a first interaction function provided in a memory device of the control device, which describes a change in an air parameter to be controlled in the first sub-area 101 as a function of the volume flow of the second ventilation unit (12).

[0147] Fig. 7shows a further embodiment of the system according to the second aspect of the invention with a plurality of ventilation units 10 which are arranged in or on a room 100 and are each designed to introduce a respective air flow into respective sub-areas (not shown) of the room 100.

[0148] The ventilation units 10 can be designed in any way. Ventilation unit 13, for example, is a ventilation unit that operates in fresh air mode and generates its airflow from air from outside the room.

[0149] The remaining ventilation units 10 are designed as mobile ventilation units that can be placed anywhere in the room and generate their air flow from air from the room 100, i.e. not with fresh air.

[0150] The room 100 comprises several table groups 110, which may deflect and / or block the air flows of the individual ventilation units and thus represent a particular challenge in the course of controlling an air parameter in the room 100 or in parts of the room 100.

[0151] The ventilation unit 14, located outside the room, introduces an air flow into the room 100 through a corresponding opening and includes a control device (not shown) coupled to the plurality of ventilation units 10 via a network of wireless connections 30. A control command originating from the control device is transmitted to the desired ventilation unit via the wireless connections 30 via the ventilation units 10 acting as nodes.

[0152] The control device is designed to adapt a volume flow of any ventilation unit 10 of the plurality of ventilation units 10 as a function of a first interaction function provided in a memory device of the control device, which first interaction function describes a change in an air characteristic to be controlled in a sub-area of ​​the room 100 assigned to another ventilation unit 10 as a function of the volume flow of any ventilation unit 10, in order to thus provide a particularly efficient control of an air characteristic in the assigned sub-area.

[0153] Embodiments of the present invention and their advantages have been described in detail above with reference to the accompanying figures.

[0154] It is emphasized again that the present invention is in no way limited to the above-described embodiments and their features. The invention further encompasses modifications of the aforementioned embodiments, in particular those resulting from modifications and / or combinations of individual or multiple features of the described embodiments within the scope of the independent claims. List of reference and formula symbols

[0155] 10 Ventilation unit 11 First ventilation unit 12 Second ventilation unit 13 Ventilation unit in fresh air mode 14 Ventilation unit located outside the room 30 Wireless connection 100 Room 101 First section 102 Second section 110 Table group B 2 Operating state of the second ventilation unit K 1 Air parameter to be controlled in the first sub-area L 1 Air parameter selected in the first sub-area to determine the interaction function Q 1 Volume flow of the first ventilation unit Q 2 Volume flow of the second ventilation unit S i Process steps f 12 ; g 12 ; h 12 first interaction function t time

Claims

1. Method for controlling an air characteristic within a room (100) by means of a plurality of ventilation units (10, 11, 12), wherein the method comprises the steps of: - providing at least a first ventilation unit (11), which is configured to introduce a first air flow into a first partial region (101) of the room (100), and a second ventilation unit (12), which is configured to introduce a second air flow into a second partial region (102) of the room (100); - controlling an air characteristic (K1) in the first partial region (101) of the room (100) by adapting at least one operating parameter (B2; Q2) of the second ventilation unit (12); characterized in that the method further comprises the step of: - providing a first interaction function (f12; g12; h12), which describes a change, caused by an operation of the second ventilation unit (12), of the air characteristic (K1) to be controlled in the first partial region (101) as a function of the at least one operating parameter (B2; Q2) of the second ventilation unit (12); and the adaptation of the at least one operating parameter (B2; Q2) of the second ventilation unit (12) for controlling the air characteristic (K1) in the first partial region (101) takes place as a function of the provided first interaction function (f12; g12; h12).

2. Method according to Claim 1, characterized in that the step of controlling the air characteristic (K1) in the first partial region (101) further comprises the substeps of - predefining a setpoint value of the air characteristic (K1) to be controlled in the first partial region (101); and - detecting an actual value of the air characteristic (K1) to be controlled in the first partial region (101); and the adaptation of the at least one operating parameter (B2; Q2) of the second ventilation unit (12) for controlling the air characteristic (K1) in the first partial region (101) additionally takes place as a function of the predefined setpoint value and the detected actual value.

3. Method according to Claim 2, characterized in that the step of controlling the air characteristic (K1) in the first partial region (101) takes place with the proviso of one or a combination of a plurality of the following objectives: - minimizing a deviation between the actual value and the setpoint value of the air characteristic (K1) to be controlled in the first partial region (101); - minimizing a duration for reaching a minimum of the deviation between the actual value and the setpoint value of the air characteristic (K1) to be controlled; - minimizing an operating volume of the first and / or of the second ventilation unit (12); - maximizing a service life of parts of the first and / or of the second ventilation unit (12), in particular of wear parts.

4. Method according to one of the preceding claims, characterized in that the step of controlling the air characteristic (K1) in the first partial region (101) additionally takes place by adapting at least one operating parameter of the first ventilation unit (11).

5. Method according to one of the preceding claims, characterized in that the step of providing the first interaction function (f12; g12; h12) comprises the step of determining the first interaction function (f12; g12; h12) with the following substeps: - detecting an initial value of an air characteristic (L1) selected for determining the first interaction function (f12; g12; h12) in the first partial region (101) at a first point in time; - introducing the second air flow through the second ventilation unit (12); - detecting a further value of the air characteristic (L1) selected for determining the first interaction function (f12; g12; h12) in the first partial region (101) at a further, later point in time; - determining the first interaction function (f12; g12; h12) on the basis of the detected initial and the detected further value of the air characteristic (L1) selected for determining the first interaction function (f12; g12; h12) in the first partial region (101); wherein the air characteristic (L1) selected for determining the first interaction function (f12; g12; h12) in the first partial region (101) is in particular the air characteristic (K1) to be controlled in the first partial region (101).

6. Method according to Claim 5, characterized in that the step of determining the first interaction function (f12; g12; h12) furthermore comprises detecting a temporal value profile of the air characteristic (L1) selected for determining the first interaction function (f12; g12; h12) in the first partial region (101), and in that the substep of determining the first interaction function (f12; g12; h12) additionally takes place on the basis of the detected temporal value profile, in particular on the basis of an integral mean and / or on the basis of an extreme value of a rate of change of the detected temporal value profile.

7. Method according to Claim 5 or 6, characterized in that the step of determining the first interaction function (f12; g12; h12) furthermore comprises providing the at least one operating parameter (B2; Q2) of the second ventilation unit (12) and optionally providing the at least one operating parameter of the first ventilation unit (11), and in that the substep of determining the first interaction function (f12; g12; h12) additionally takes place on the basis of the provided operating parameter or the provided operating parameters.

8. Method according to one of Claims 5 to 7, characterized in that the determination of the first interaction function takes place when the first ventilation unit (11) is switched off.

9. Method according to one of the preceding claims, characterized in that a value of the first interaction function (f12; g12; h12) can lie at least in a first or in a second value range, and in the step of controlling the air characteristic (K1) in the first partial region (101) an adaptation of the at least one operating parameter (B2; Q2) of the second ventilation unit (12) and / or a switching-on of the second ventilation unit (12) takes place if the value of the interaction function (f12; g12; h12) lies in the first value range and a value of the air characteristic (K1) to be controlled in the first partial region (101) exceeds a first limit value, and / or if the value of the interaction function (f12; g12; h12) lies in the second value range and the value of the air characteristic (K1) to be controlled in the first partial region (101) exceeds a second limit value.

10. Method according to one of the preceding claims, characterized in that the air characteristic (K1) to be controlled in the first partial region (101) is one of the following variables: - a concentration or a quantity of volatile organic compounds; - a concentration or a quantity of carbon dioxide; - a concentration or a quantity of oxygen; - a concentration or a quantity of aerosols; - a size or a concentration or a quantity of solid particles; - an air temperature; - an air humidity.

11. Method according to one of the preceding claims, characterized in that the provided first interaction function (f12; g12; h12) is updated at temporal intervals, in particular at periodic time intervals or continuously, during the controlling of the air characteristic (K1) in the first partial region (101).

12. Method according to one of the preceding claims, characterized in that at least the first or the second ventilation unit (11; 12) is operated in a displacement mode, in which the introduction of the respective air flow takes place with the proviso of forming a pool of fresh air adjoining a floor surface of the room (100), wherein values of the air characteristic (K1) to be controlled in the first partial region (101) are detected by at least one detection device of the first ventilation unit (11), which is arranged in a lower region of the first ventilation unit (11), wherein the lower region adjoins the floor surface or faces the latter, in such a way that the detection device can detect the presence of a pool of fresh air.

13. Method according to one of the preceding claims, characterized in that the method additionally comprises the step of detecting room data, and the step of controlling the air characteristic (K1) in the first partial region (101) additionally takes place as a function of the detected room data, wherein the room data comprise one or more of the following items of information: - a number of persons staying within the room (100); - a position and / or a movement of at least one person staying within the room (100); - a spatial distance from installation locations of the first and of the second ventilation unit (12); - dimensions of the room (100).

14. Method according to one of the preceding claims, characterized in that the method furthermore comprises the steps of: - providing a second interaction function, which describes a change of an air characteristic to be controlled in the second partial region (102) of the room (100) as a function of the at least one operating parameter of the first ventilation unit (11); - controlling the air characteristic in the second partial region (102) of the room (100) by adapting the at least one operating parameter of the first ventilation unit (11) and / or the at least one operating parameter (B2; Q2) of the second ventilation unit (12) as a function of the provided second interaction function.

15. System for controlling an air characteristic (K1) within a room (100), comprising: - at least a first ventilation unit (11), which is configured to introduce a first air flow into a first partial region (101) of the room, and a second ventilation unit (12), which is configured to introduce a second air flow into a second partial region (102) of the room (100); - a control device, which is coupled at least to the second ventilation unit (12) and which is configured to adapt at least one operating parameter (B2; Q2) of the second ventilation unit (12) via control commands and thus to control an air characteristic (K1) to be controlled in the first partial region (101) of the room (100); characterized in that the control device is further configured to adapt the at least one operating parameter (B2; Q2) of the second ventilation unit (12) as a function of a first interaction function (f12; g12; h12), which is provided in a memory device of the control device and which describes a change, caused by an operation of the second ventilation unit (12), of the air characteristic (K1) to be controlled in the first partial region (101) as a function of the at least one operating parameter (B2; Q2) of the second ventilation unit (12).

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