DE102021116570A1 - METHOD AND SYSTEM FOR CONTROLLING AN AIR PARAMETERS USING A VARIETY OF VENTILATION UNITS - Google Patents

Abstract

The invention provides a method for controlling an air parameter within a room 100 by means of a multiplicity of ventilation units 10, 11, 12, the method comprising the steps of providing at least a first ventilation unit 11, which is used to introduce a first air flow into a first partial area 101 of the room 100 is set up, and a second ventilation unit 12, which is set up for introducing a second air flow into a second partial area 102 of the room 100, controlling an air parameter K ₁ in the first partial area 101 of the room 100 by adjusting at least one operating parameter B ₂ ; Q ₂ of the second ventilation unit 12 and providing a first interaction function f ₁₂ ; _g12 ; h ₁₂ , which indicates a change in the air parameter K ₁ to be controlled in the first partial area 101 as a function of the at least one operating parameter B ₂ ; Q ₂ of the second ventilation unit 12 describes, wherein the adjustment of the at least one operating parameter B ₂ ; Q ₂ of the second ventilation unit 12 for controlling the air parameter K ₁ in the first partial area 101 as a function of the first interaction function f ₁₂ provided; _g12 ; h ₁₂ done, ready.

Description

technical field

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 using a plurality of ventilation units.

Background of the Invention

For the air conditioning of rooms, maintaining a desired, predetermined condition of the air in them plays an important role, which is associated with correspondingly high demands on the control of the devices used for air conditioning a room, especially in large rooms, in order to proceed as efficiently as possible with a potentially high number of people in it, such as catering facilities, lecture halls, classrooms or open-plan offices.

With regard to the most efficient air conditioning possible, the focus is also on energy and economic aspects when operating the devices used, a comfort-related perception of the people in the room or a reduction in a risk of infection potentially favored by a large number of people.

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, for example in order to influence the air temperature in the room or to keep the germ load in the air in the room below a certain limit value, with the several ventilation units for collaborative air conditioning of the room are usually operated at the same time.

For this example, from the prior art in the WO 2020/108667 A1 an air purification system with a plurality of ventilation units is known, which each detect a fine dust concentration in the environment associated with the respective ventilation unit and the control of the plurality of ventilation units takes place as a function of an average value of all the fine dust concentrations detected.

The several ventilation units are usually set up in different positions within the room and can usually also be repositioned in the room in the form of a mobile version without much effort.

The air conditioning-related effects on the air in the room are largely unknown when using several ventilation units, sometimes placed anywhere in the room, which in turn has a negative impact on the efficiency of the air conditioning.

Summary of the Invention

One object of the present invention is therefore to provide a possibility for more efficient air conditioning of a room by means of a large number of ventilation units.

To solve this problem, a method for controlling an air parameter within a room using a plurality of ventilation units according to claim 1 and a system for controlling an air parameter within a room with a plurality of ventilation units according to claim 19 are proposed.

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

According to a first aspect of the invention, a method for controlling an air parameter within a room using a plurality of ventilation units is provided, the method comprising the steps of providing at least one first ventilation unit, which is set up to introduce a first air flow into a first partial area of the room, and a second ventilation unit, which is set up to introduce a second air flow into a second partial area of the room, controlling an air parameter in the first partial area of the room by adapting at least one operating parameter of the second ventilation unit and providing a first interaction function, which changes the describes the air parameter to be controlled in the first partial area as a function of the at least one operating parameter of the second ventilation unit. The at least one operating parameter of the second ventilation unit for controlling the air parameter in the first sub-area is adjusted as a function of the first interaction function provided.

Partial areas are individual spatial areas of the room in the sense of a subset, which are not closed off from the rest of the room in such a way that it is in principle possible with the help of air flows taking place within the room to move air from the first to the second Sub-area (or vice versa) to transfer.

A combination of the first and the second partial area does not necessarily include the entire room. Likewise, the first and the second partial area do not necessarily have to be adjacent to one another, but can also be arranged at a distance from one another, with any number of further partial areas lying in between. The first and the second ventilation unit thus each introduce at least one air flow into the same room.

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

This can include absolute variables, such as a quantity or a concentration of a solid, liquid or gaseous component of the air, rates of change in the absolute variables, such as a rate of change of said concentration over time, or integral averages of the absolute variables, such as a time and/or spatial mean of said concentration.

Said absolute values can be, inter alia, a concentration or an amount (volume or mass) of oxygen, carbon dioxide or nitrogen, a concentration or an amount of volatile organic compounds or an aerosol, a concentration, amount or size of solid particles , be an air temperature, an air pressure or an air humidity, whereby the previous list is not to be understood as conclusive. The method according to the invention is in no way limited to controlling the air parameters mentioned above only as examples.

Said concentrations can be given in all the usual ratios, ie 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.

An operating parameter of the ventilation unit can be understood to mean any parameter via which the operation of the ventilation unit can be described and/or which can be set on a control unit set up to control the ventilation unit.

For example, this can be a volume flow, an air temperature or humidity of the air flow introduced by the ventilation unit, an electrical output 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 "switched on" or "switched off". " act.

An interaction function is to be understood as any relation which, in order to describe a change in an air parameter to be controlled in a sub-area due to the operation of a ventilation unit assigned to another sub-area, assigns or maps elements of an arbitrarily designed initial set to elements of an arbitrarily designed target set (see also 1 until 4B) . This can be, for example, an analytical function, a characteristic diagram or an assignment table which, in particular, maps real numbers to one another in such a way that both the starting and the target set are subsets of the real numbers.

In the present case, 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 simplified only with interaction designated).

An existing interaction in the sense 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 partial area and thereby causes a change in the air parameter in the first partial area. On the other hand, if no such air flow can be generated by the operation of the second ventilation unit, then there is no interaction.

In the case of the first interaction function, for example, the initial set of an interaction function can contain discretely but also continuously distributed values of the at least one operating parameter of the second ventilation unit as elements, which are assigned to elements of the target set. The elements of the initial 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 include 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 and/or Contain values of an air parameter from the second sub-area.

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

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

The target quantity can also contain as elements, for example, values of any physical variables, their rates of change or integrals, but also time information about a change duration that are suitable for describing a change in the air parameter to be controlled, the list not being understood to be exhaustive.

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, for example, by information contained in the target quantity about the percentage of the second air flow that flows from the second into the first sub-area, since this causes an input flow in the first sub-area is described 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.

The method according to the invention provides a particularly efficient way of controlling the air parameter in the first partial area of the room, which uses knowledge about 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 partial area , he follows.

A precise connection between the mutual influence of several ventilation units in the course of air conditioning a room is known from the methods known from the prior art, for example from WO 2020/108667 A1 , unknown, which under certain circumstances can lead to unfavorable control processes, since, for example, a collaborative operation of two ventilation units is started, although this has no added value compared to operation with only one ventilation unit, or is even disadvantageous in terms of a cost-benefit ratio, eg in view of the increased energy consumption. This can be due, for example, to the fact that an air flow from one ventilation unit does not penetrate, or only to a very small extent, into an area surrounding the other ventilation unit due to the arrangement of furnishings in the room.

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

The method thus creates the possibility of collaborative operation of at least two ventilation units using the knowledge of said mutual influence, as a result of which 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 at the same time to keep energy consumption, noise pollution or mechanical stress on the ventilation units to a minimum.

In a preferred embodiment, the step of controlling the air parameter in the first sub-range also includes the sub-steps of specifying a target value of the air parameter to be controlled in the first sub-range and detecting an actual value of the air parameter to be controlled in the first sub-range, with the adjustment of the at least one operating parameter the second ventilation unit for controlling the air parameter in the first sub-area also takes place as a function of the specified target value and the recorded actual value.

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-range, which in this case corresponds to an air parameter to be regulated, is controlled as a function of the actual and setpoint values, with a difference between the both values are relevant.

The detection of the actual value can be done by measuring the to be controlled or in this Case to be controlled air parameter at one or more positions in the first sub-area, in particular by means of one or more detection devices on the first ventilation unit or in an environment of the first ventilation unit. In this case, the recorded actual value preferably corresponds to a mean value of measured values of the air parameter measured at the one or more positions in the first partial area.

• - Minimierung einer Abweichung zwischen dem Ist-Wert und dem Soll-Wert der zu steuernden Luftkenngröße im ersten Teilbereich;
• - Minimierung einer Dauer zum Erreichen eines Minimums der Abweichung zwischen dem Ist-Wert und dem Soll-Wert der zu steuernden Luftkenngröße;
• - Minimierung einer Betriebslautstärke der ersten und/oder der zweiten Lüftungseinheit;
• - Maximierung einer Lebensdauer von Teilen der ersten und/oder der zweiten Lüftungseinheit, insbesondere von Verschleißteilen.

In a preferred embodiment, the step of controlling the air parameter in the first sub-area takes place under the stipulation of one or a combination of several of the following goals:

• - Minimization of a deviation between the actual value and the target value of the air parameter to be controlled in the first partial area;
• - Minimizing a duration to reach a minimum of the deviation between the actual value and the target value of the air parameter to be controlled;
• - Minimizing an operating volume of the first and/or the second ventilation unit;
• - Maximizing a service life of parts of the first and/or the second ventilation unit, in particular wear parts.

The deviation is to be understood as a deviation in terms of amount, which is to be minimized.

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

For example, using the knowledge of the interaction in the latter case, it could be advantageous to operate the first and the second ventilation unit at half power instead of operating the first ventilation unit at full load, provided that the same desired target value of the controlling air parameter can be achieved in the first sub-area. Such a procedure not only reduces the noise level, but also increases the service life of the individual ventilation units, since these do not necessarily have to be operated under full load, as described in the example.

In a preferred embodiment, the step of controlling the air parameter in the first partial area is additionally carried out by adapting at least one operating parameter of the first ventilation unit.

In this way, the method according to the invention has more actuators available for controlling the air parameter in the first partial area, as a result of which the control itself can be further improved.

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

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

In a preferred embodiment, the step of providing the first interaction function includes 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 partial 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.

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

This is particularly advantageous in the case of mobile ventilation units, since their installation location is unknown per se and may also be changed, and thus an interaction is unknown per se or can change, e.g. when a ventilation unit is repositioned. These circumstances, which are unfavorable for the control of the air parameter, are advantageously intercepted by the described step of determining the first interaction function.

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

The air parameter selected for determining the first interaction function in the first partial range can be any air parameter as long as it provides information in some way about the interaction in relation to the air parameter to be controlled. If, for example, a carbon dioxide concentration is selected as the air parameter selected for determining the first interaction function, this also provides (at least partial) information about changes in an exemplary oxygen concentration to be controlled.

In particular, however, the air parameter selected for determining the first interaction function in the first sub-area is the air parameter to be controlled in the first sub-area.

In a preferred embodiment, the step of determining the first interaction function also includes detecting a value profile over time 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 also carried out on the basis of the recorded value profile over time, in particular on the basis of a integral mean and/or on the basis of an extreme value of a rate of change of the recorded value curve over time.

In a preferred embodiment, the step of determining the first interaction function also includes 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, the sub-step of determining the first interaction function also being based on the operating parameter provided or the provided operating parameters takes place.

In this way, the first interaction function can be specified more precisely as a function of several output variables, which in turn enables more efficient control of the air parameter in the first sub-area, since a broader spectrum of possible constellations of air parameter and operating parameter(s) is available as the initial quantity.

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

However, the first interaction function can preferably also be determined when the first ventilation unit is switched on.

The step of determining the first interaction function preferably includes using a tracer gas with which the second air flow is enriched. A tracer gas (or test gas, for example carbon dioxide) can be detected in a particularly simple manner and thus allows the first interaction function to be determined quickly and reliably.

In a preferred embodiment, a value of the interaction function can be at least in a first or in a second value range, with the step of controlling the air characteristic in the first sub-range switching on and/or adjusting the at least one operating parameter of the second ventilation unit if the value of the interaction function is in the first value range and a value of the air parameter to be controlled in the first sub-range exceeds a first limit value, and/or if the value of the interaction function is in the second value range and the value of the air parameter to be controlled in the first sub-range exceeds a second limit value.

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

For example, the first range of values may include cases of weak to moderate interaction, whereas the second range of values includes cases of high interaction. In the case of a high level of interaction, it would be advantageous to always leave the second ventilation unit switched on to support the control of the air parameter in the first sub-area and thus to provide “basic” support. In the case of weak to moderate interaction, on the other hand, it would be advantageous to switch the second ventilation unit on or in only to avoid full-load operation of the first ventilation unit and thus provide “conditional” support.

• - eine Konzentration oder eine Menge von flüchtigen organischen Verbindungen;
• - eine Konzentration oder eine Menge von Kohlenstoffdioxid;
• - eine Konzentration oder eine Menge von Sauerstoff;
• - eine Konzentration oder eine Menge von Aerosolen;
• - eine Größe oder eine Konzentration oder eine Menge von Feststoffpartikeln;
• - eine Lufttemperatur; oder
• - eine Luftfeuchtigkeit.

In a preferred embodiment, the air parameter to be controlled in the first sub-area is one of the following variables:

• - a concentration or amount of volatile organic compounds;
• - a concentration or amount of carbon dioxide;
• - a concentration or amount of oxygen;
• - a concentration or amount of aerosols;
• - a size or a concentration or an amount of solid particles;
• - an air temperature; or
• - a humidity level.

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

The characteristic air variable to be controlled in the first partial area is preferably a combination of two or more of the variables listed above.

In this way, a simultaneous control of several state variables of the air in the first partial area can be controlled in the form of a common air parameter, with prioritization taking place through a respective weighting of the combination. For example, said air parameter can be a combination of air temperature, concentration of carbon dioxide and concentration of volatile organic compounds, which are each weighted 30%, 20% and 50%, for example, and thus controlling the concentration of volatile organic compounds would have top priority.

In a preferred embodiment, the first interaction function that is provided is updated at time intervals during the control of the air parameter in the first partial area, in particular at periodic time intervals or continuously.

In this way, changes in the boundary conditions that would influence the interaction, e.g. changing number of people in the room, open windows, etc., can be reacted to while controlling the air parameter, without such information having to be recorded directly, since its influence in the course of a Updating the first interaction function is taken into account accordingly.

In this case, the interaction function is preferably updated by repeating the described step of determining the first interaction function.

In a preferred embodiment, at least the first or the second ventilation unit is operated in a displacement air mode, in which the introduction of the respective air flow takes place with the proviso that a fresh air lake is formed adjacent to a floor area of the room.

In this way, the room can be air-conditioned according to the displacement air principle, which is particularly suitable for use in classrooms or lecture halls and in the course of which accumulating fresh air collects on the floor of the room, the so-called fresh air sea, and each person can immediately get their individually required amount of air refers from fresh air sea, whereby this gets directly into a breathing zone of the person by the body's own buoyancy flow from the ground and exhaled air with aerosols and the like rise 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 that is formed, which is particularly advantageous in comparison to pure air circulation when used in classrooms or lecture halls. in order, for example, to control a concentration of volatile organic compounds particularly efficiently.

In a preferred embodiment, values of the air parameter to be controlled are recorded in the first partial area by at least one recording device of the first ventilation unit, which is arranged in a lower area of the first ventilation unit, the lower area adjoining or facing the floor surface in such a way that the Detection device can detect a presence of a fresh air lake.

In this way, the control of the air parameter in the first sub-area is improved even when using the source air mode, since it is ensured that a fresh air pool that is present is also recognized in the course of the method and taken into account accordingly, which is more difficult, for example, with a detection device arranged on the top of the ventilation unit would shape, since the fresh air lake may not penetrate to that point.

In a preferred embodiment, at least the first or the second ventilation unit is operated in a fresh air mode in that the respective air flow is proportionately mixed with fresh outside air from an environment that is separate from the room, or the respective air flow consists entirely of fresh outside air.

In this way, in contrast to air recirculation mode, which only circulates the air in the room, the room is supplied with allows fresher and usually less polluted outside air, which is particularly advantageous in order to increase an oxygen concentration in the course of the method according to the invention or to reduce a concentration of carbon dioxide in the room.

In a preferred embodiment, at least the first or the second air flow is cleaned before it is introduced into the respective partial area, in particular in such a way that volatile organic compounds and/or solid particles and/or other impurities are removed from the respective air flow.

• - eine Anzahl von sich innerhalb des Raumes aufhaltenden Personen;
• - eine Position und/oder eine Bewegung von zumindest einer sich innerhalb des Raumes aufhaltenden Person;
• - eine räumliche Distanz von Aufstellorten der ersten und der zweiten Lüftungseinheit;
• - Abmessungen des Raumes.

In a particularly preferred embodiment, the method also includes the step of acquiring room data, and the step of controlling the air characteristic in the first sub-area also takes place as a function of the acquired room data, with the room data comprising one or more of the following items of information:

• - a number of people staying inside the room;
• - a position and/or a movement of at least one person within the room;
• - A spatial distance from installation sites of the first and the second ventilation unit;
• - Dimensions of the room.

In this way, in the course of controlling the air parameter in the first sub-area, additional boundary conditions in the form of the information listed above can be taken into account in a targeted manner. In particular, the method can take into account person-specific information, in the course of which, for example, introduced air flows are increased when the number of people is particularly high and reduced when the room is empty.

In a preferred embodiment, the method further comprises the steps of providing a second interaction function, which describes a change in an air parameter to be controlled in the second partial area of the room as a function of the at least one operating parameter of the first ventilation unit, and controlling the air parameter in the second partial area of the room by adapting it 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 second interaction function provided.

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

The method preferably includes providing N ventilation units, each of which is set up to introduce an Nth air flow into an Nth sub-area, providing a multiplicity of interaction functions, each of which changes an air parameter to be controlled in a specific sub-area as a function of one or several 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 adjusting the one or more operating parameters of the one or more ventilation units as a function of the plurality of interaction functions provided.

In this way, the method is extended for use with a complex network of ventilation units, with which air parameters in a single sub-area of the room are controlled in a targeted and, above all, efficient manner by collaborative operation of any number of other ventilation units using the multitude of interaction functions provided can be.

This advantageous development is by no means limited to the specific sub-area, but can provide a large number of interaction functions for each sub-area, with air parameters being controlled in each sub-area as a function of the respective large number of interaction functions.

According to a second aspect of the invention, a system for controlling an air parameter within a room is provided, which has at least a first ventilation unit, which is set up to introduce a first air flow into a first partial area of the room, and a second ventilation unit, which is set up to introduce a second Introduce air flow into a second partial area of the room, and comprises a control device which is coupled at least to the second ventilation unit and is set up 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 partial area of the room. The control device is also set up to adapt the at least one operating parameter of the second ventilation unit as a function of a first interaction function provided in a storage device of the control device, which describes a change in the air parameter to be controlled in the first partial area as a function of the at least one operating parameter of the second ventilation unit.

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 controlling the air parameter more efficiently.

The control device is preferably also coupled to the first ventilation unit and set up to adapt at least one operating parameter of the first ventilation unit via control commands.

The first ventilation unit preferably comprises a detection device which is set up to detect an air parameter selected for determining the first interaction function in the first sub-area, the control device further comprising an evaluation unit which is set up to receive an initial value from the detection device for determining the first interaction function selected air parameter 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 make these available in to store the memory device of the control device.

The detection device is preferably set up to detect a time history of the air parameter selected for determining the first interaction function in the first sub-area and to transmit it to the evaluation unit, with the evaluation unit being set up to also determine the first interaction function on the basis of the transmitted value history, and /or the evaluation unit is set up 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.

At least the first or the second ventilation unit is preferably set up to be operated in a displacement air mode, in which the introduction of the respective air flow takes place in such a way that a fresh air sea adjacent to a floor area of the room is formed.

The detection device of the first ventilation unit is preferably arranged in a lower area of the first ventilation unit in such a way that it borders on the floor surface of the room or at least faces it in order to be able to detect the presence of a fresh air pool.

The first or the second ventilation unit preferably includes a fresh air device that is set up to mix air from an environment that is delimited with respect to the room proportionately to the respective air flow as fresh outside air or to generate the respective air flow completely from this.

Preferably, at least the first or the second ventilation unit comprises an air cleaning device, which is set up to clean the respective air flow before it is introduced into the respective partial area, and in doing so to remove in particular volatile organic compounds and/or solid particles and/or other contaminants from the respective air flow .

Preferably, at least the first or the second ventilation unit comprises a temperature control device which is set up to set a temperature and/or a humidity of the respective air flow before it is introduced into the respective partial area.

The control device is preferably designed as part of the first or as part of the second ventilation unit or is provided separately as a central control device.

In this way, the control device set up for controlling with collaborative operation of the ventilation units can be provided centrally or else decentrally. For example, the problem of a possibly limited range of a wireless connection originating from a control device of one ventilation unit to other ventilation units can be solved by using a centrally positioned control device within whose wireless connection range all ventilation units are located.

On the other hand, the embodiment with a control device designed as part of the ventilation unit offers the advantage, for example, that no additional central control device has to be provided as a further possibly space-consuming component.

The control device is preferably coupled wirelessly to the first and/or to the second ventilation unit. As a result, no additional lines are required, which, among other things, makes it very easy to integrate further ventilation units into the system and, on the other hand, allows mobile ventilation units to be positioned anywhere within the room.

Another 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.

A further aspect of the invention consists in providing a control device for a system according to the second aspect of the invention.

• 1A bis 1D zeigen Beispiele möglicher erster Wechselwirkungsfunktionen zum Einsatz in einem Verfahren gemäß des ersten Aspekts der Erfindung in Abhängigkeit eines Volumenstroms der zweiten Lüftungseinheit.
• 2 zeigt ein Beispiel einer möglichen ersten Wechselwirkungsfunktion zum Einsatz in einem Verfahren gemäß des ersten Aspekts der Erfindung in Abhängigkeit eines Betriebszustands der zweiten Lüftungseinheit.
• 3A und 3B zeigen exemplarische Zeitverläufe einer Luftkenngröße im ersten Teilbereich zum Ermitteln der ersten Wechselwirkungsfunktion.
• 4A und 4B zeigen exemplarische Zeitverläufe der zu steuernden Luftkenngröße im ersten Teilbereich.
• 5 zeigt ein exemplarisches Ablaufdiagram eines Ausführungsbeispiels des Verfahrens gemäß des ersten Aspekts der Erfindung.
• 6 und 7 zeigen Ausführungsbeispiele des Systems gemäß des zweiten Aspekts der Erfindung,

Further aspects and their advantages as well as more specific exemplary embodiments of the aspects and features mentioned above are described below with the aid of the drawings shown in the attached figures:

• 1A until 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.
• 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.
• 3A and 3B show exemplary time curves of an air parameter in the first sub-area for determining the first interaction function.
• 4A and 4B show exemplary time curves of the air parameter to be controlled in the first sub-area.
• 5 shows an exemplary flow chart of an embodiment of the method according to the first aspect of the invention.
• 6 and 7 show exemplary embodiments of the system according to the second aspect of the invention,

Identical or similar elements in the figures can be denoted by the same reference numbers, but sometimes also by different reference numbers.

It is emphasized that the present invention is in no way limited to the exemplary embodiments described below and their design features. The invention also includes modifications of the exemplary embodiments mentioned, in particular those resulting from modifications and/or combinations of individual or several features of the exemplary embodiments described within the scope of the independent claims.

Detailed character description

1A until 1D show exemplary representations of possible first interaction functions f ₁₂ ; _g12 ; h ₁₂ for use in a method according to the first aspect of the invention, which describe a change in an air parameter K ₁ to be controlled in a first partial area of a room depending, among other things, on an operating parameter corresponding to the volume flow Q ₂ of a second ventilation unit.

The volume flow Q ₂ is usually given in units of cubic meters per hour or liters per second, with the 1A until 1D specific values of the volume flow Q ₂ of the second ventilation unit are denoted by λ and λ _i , respectively.

The first interaction functions f ₁₂ ; _g12 ; h ₁₂ partly also depend on an air parameter K ₁ to be controlled in the first sub-area, with the 1A until 1D specific values of the air parameter K ₁ to be controlled are denoted by A, B and C.

The first interaction functions f ₁₂ ; _g12 ; h ₁₂ describe an extent of an interaction between changes in the air parameter K ₁ to be controlled in the first sub-area and an operation of the second ventilation unit, which in the present case is determined on the basis of the volume flow Q ₂ . Values of the first interaction functions f ₁₂ ; _g12 ; h ₁₂ can, for example, in direct connection with in the 3A and 3B sizes shown.

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 partial area and on the volume flow Q ₂ of the second ventilation unit, plotted against said volume flow Q ₂ .

The higher the value of the first interaction function f ₁₂ , the more the air parameter K ₁ to be controlled changes in the first partial range. For a volume flow Q ₂ =0 there is no change in the air parameter K ₁ to be controlled in the first partial 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 to be controlled ₁ are present in the first sub-area.

Depending on the current value A, B or C of the air parameter K ₁ to be controlled in the first sub-area, with the same volume flow Q ₂ , there can be a different pronounced change in said air parameter K ₁ .

If, for example, the air parameter K ₁ to be controlled is a concentration of carbon dioxide, which is to be reduced, for example, using the method according to the invention, then for an initially comparatively high concentration of carbon dioxide (given by K ₁ =C, for example), the same Volume flow Q ₂ implement a greater change in the concentration of carbon dioxide in the first subregion than would be the case for an initially comparatively low concentration of carbon dioxide (example given by K1=A or K ₁ =B).

1B shows an alternative, three-dimensional representation of, among other things, in 1A shown exemplary curves of the first interaction function f ₁₂ , wherein compared to 1A two additional curves each for a value of the air parameter _K1 to be controlled between the values A and B and between the values B and C.

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 .

The first interaction function g ₁₂ can assume 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.

Based on the discrete distribution shown in 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 in the course of controlling the air parameter K ₁ in the first sub-area, since, according to the first interaction function, this results in a corresponding change in the air parameter K ₁ to be controlled in the first sub-area can be expected. On the other hand, an adaptation to one of the values λ ₁ or λ ₂ would be ruled out.

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

The discretely distributed first interaction function g ₁₂ contains in comparison to the other interaction functions in the 1A , 1B and 1D a small amount of information with regard to the interaction, but is characterized by a good overview and a smaller memory space when stored in a memory device of a control device set up for carrying out the method according to the invention.

1D 12 shows an example of a further first interaction function h ₁₂ , shown as a characteristic map of the air parameter K ₁ to be controlled and the volume flow Q ₂ of the second ventilation unit.

In contrast to the in 1B The interaction function shown is shown as a map in 1D as an area whose height above a base point defined by the values of K ₁ and Q ₂ indicates a measure for the change in the air parameter to be controlled due to operation of the second ventilation unit. In this way, an associated value of the interaction function h ₁₂ can be specified directly for any constellation of K ₁ and Q ₂ .

2 shows an example of another first interaction function f ₁₂ , which, in contrast to the interaction functions from the 1A until 1D does 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 for a case in which a volume flow of the second ventilation unit cannot be adjusted but remains constant at a nominal value.

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 partial area, or whether the second ventilation unit is switched off (value "0").

3A shows an example of an air parameter L ₁ in the first partial range 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.

The air parameter L ₁ is an air parameter selected for determining the first interaction function, which can optionally also correspond to the air parameter to be controlled.

At time t ₀ the second ventilation unit is switched on and the volumetric flow Q ₂ of the air flow introduced into the second partial area by the second ventilation unit is adjusted to the value λ>0.

As a reaction 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 ) to a stationary value over a period of time T L ₁ .

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

To determine the first interaction function, various relations and variables from the time history shown can now be used. For example, an extent for the interaction at a volume flow rate Q ₂ =λ can be calculated based on the time T to reach the steady state L ₁ , based on the difference L ₁ (t=t ₀ )- L ₁ or based on the shaded area corresponding to the integral I according to equation 1.

$$\text{I}={\displaystyle {\int }_{{\text{t}}_0}^{{\text{<figure-callout id="0" label="t" filenames="DE102021116570A1\_0002.png,DE102021116570A1\_0003.png" state="{{state}}">t</figure-callout>}}_0+\text{T}}\left[{\text{L}}_1\left(\text{t}\right)-{\overline{\text{L}}}_1\left({\text{<figure-callout id="2" label="Q" filenames="DE102021116570A1\_0007.png" state="{{state}}">Q</figure-callout>}}_2=\mathrm{\lambda }\right)\right]}\text{German}$$

3B shows an example of a time course of a rate of change dL ₁ /dt of the air parameter L ₁ in the first sub-area over time t as a reaction to an adjustment of the volume flow Q ₂ of the second ventilation unit from the value 0 to the value λ, which is used to determine the first interaction function can, the course shown of the time derivatives of the course of the air parameter L ₁ from 3A is equivalent to.

The rate of change dL ₁ /dt over time 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, with which the in 3A shown steady state with the value L ₁ is reached.

To determine the first interaction function, alternatively or in addition to the one from the time history 3A The extreme value min(dL ₁ /dt) can also be used for the relations and variables to be taken, which provides information about the maximum rate of change that can be achieved in terms of amount by operating the second ventilation unit.

4A shows two exemplary time curves 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.

If 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 in the case with support from the second ventilation unit (Q ₂ =λ). Consequently, there is a significant change in the air parameter K ₁ to be controlled as a result of the operation of the second ventilation unit, which can be described by a first interaction function within the meaning of the method according to the invention.

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

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 adapting the volume flow Q ₂ of the second ventilation unit, the target value is reached much more quickly than in the case also shown when the second ventilation unit is constantly switched off (Q ₂ (t)=0). The second ventilation unit is thus used in an advantageous manner using the first interaction function to control the air parameter K ₁ in the first partial area.

5 shows an exemplary flow chart of an exemplary embodiment of the method according to the first aspect of the invention with steps S1 to S8, the method being structured in the sense of a control method and the air parameter to be controlled in the first sub-area thus corresponding to an air parameter to be controlled in the first sub-area.

In step S1, a first ventilation unit for introducing a first airflow into a first partial area of a room and a second ventilation unit for introducing a second airflow into a second partial area of the room are provided.

The introduction of the respective air flows takes place with regard to an air parameter to be controlled for the air inside the room, in particular in the first partial area, by adjusting one or more operating parameters of the ventilation units.

In step S2, a first interaction function is determined and then made available provides, wherein the first interaction function describes a change in the air parameter to be controlled or, in this case, to be regulated in the first partial area as a function of at least one operating parameter of the second ventilation unit.

In this way, the method according to the invention is provided with information about the extent of an interaction between changes in the air parameter to be regulated in the first sub-area and operation of the second ventilation unit, which enables particularly efficient control of the air parameter in the first sub-area.

The subsequent 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-area, 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-area .

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

In step S4, an actual value of the air parameter to be regulated is recorded in the first partial range.

In step S5, the actual value and target value of the air parameter to be controlled are compared with one another, with step S6 being initiated if the actual value deviates from the target value (taking into account a specified tolerance) and step S8 being initiated directly if there is no deviation is passed over.

In step S6, the at least one operating parameter of the second ventilation unit is adjusted, which in the exemplary embodiment on which it is based corresponds to the volume flow of the air flow introduced through the second ventilation unit, with the adjustment taking place as a function of the deviation between the actual and target value and as a function of the first interaction function .

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

If there is still a discrepancy, steps S6 to S7 are repeated until the actual value corresponds to the target value, taking into account the specified tolerance Air parameter in the first sub-area takes place at regular time intervals.

Based on the recorded actual values, steps S5 to S8 are repeated in accordance with 5 shown flow chart.

6 10 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 set up for introducing an air flow into the first partial area 101 and into the second partial area 102.

The partial areas 101 , 102 do not directly adjoin one another and are arranged at different positions within the room 100 .

The second ventilation unit comprises a control device (not shown), which in the exemplary embodiment shown is set up to adjust 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 changes an air parameter to be controlled in the first partial area 101 as a function of the volume flow of the second ventilation unit (12).

7 shows 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 set up to introduce a respective air flow into respective partial areas (not shown) of the room 100.

The ventilation units 10 can be configured as desired. For example, ventilation unit 13 is a ventilation unit that operates in fresh air mode and generates its airflow from air from outside the room.

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, ie not with fresh air.

The room 100 includes several groups of tables 110, which under certain circumstances can deflect and/or block the air flows of the individual ventilation units and thus pose a particular challenge in the course of controlling an air parameter in the room 100 or in partial areas of the room 100.

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

The control device is set up to determine 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 storage device of the control device, which is a function of a change in an air parameter to be controlled in a sub-area of the room 100 assigned to another ventilation unit 10 of the volume flow of any ventilation unit 10 describes, in order to provide a particularly efficient control of an air parameter in the associated sub-area.

Exemplary embodiments of the present invention and their advantages have been described in detail above with reference to the attached figures.

It is again emphasized that the present invention is in no way limited to the exemplary embodiments described above and their implementation features. The invention also includes modifications of the exemplary embodiments mentioned, in particular those resulting from modifications and/or combinations of individual or several features of the exemplary embodiments described within the scope of the independent claims.

Reference List

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

Space

101

first section

102

second section

110

table group

B2

Operating status of the second ventilation unit

K1

air parameter to be controlled in the first sub-area

L1

Air parameter selected for determining the interaction function in the first partial area

Q1

Flow rate of the first ventilation unit

Q2

Flow rate of the second ventilation unit

si

process steps

f12; g12; h12

first interaction function

t

time

QUOTES INCLUDED IN DESCRIPTION

This list of the documents cited by the applicant was 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.

Patent Literature Cited

• WO 2020108667 A1 [0005, 0029]

Claims (19)

Method for controlling an air parameter within a room (100) by means of a large number of ventilation units (10, 11, 12), the method comprising the steps of: - providing at least a first ventilation unit (11) which is used to introduce a first air flow into a first Section (101) of the room (100) is set up, and a second ventilation unit (12) which is set up for introducing a second air flow into a second section (102) of the room (100); - Control an air parameter (K ₁ ) in the first portion (101) of the room (100) by adjusting at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12); characterized in that the method further comprises the step of: - providing a first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) which changes the air parameter (K ₁ ) to be controlled in the first partial area (101) as a function of the at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12); and adjusting the at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12) to control the air parameter (K ₁ ) in the first partial area (101) as a function of the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) provided he follows. procedure after claim 1 , characterized in that the step of controlling the air parameter (K ₁ ) in the first sub-area (101) further includes the sub-steps - specifying a target value of the air parameter to be controlled (K ₁ ) in the first sub-area (101); and - detecting an actual value of the air parameter to be controlled (K ₁ ) in the first partial area (101); and adapting the at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12) to control the air parameter (K ₁ ) in the first sub-area (101) additionally as a function of the specified target value and the recorded actual value he follows. procedure after claim 2 , characterized in that the step of controlling the air parameter (K ₁ ) in the first sub-area (101) takes place under the stipulation of one or a combination of several of the following objectives: - Minimization of a deviation between the actual value and the target value of the controlling air parameter (K ₁ ) in the first sub-area (101); - Minimizing a duration to reach a minimum of the deviation between the actual value and the target value of the air parameter to be controlled (K ₁ ); - Minimizing an operating volume of the first and/or the second ventilation unit (12); - Maximizing the service life of parts of the first and/or the second ventilation unit (12), in particular wear parts. Method according to one of the preceding claims, characterized in that the step of controlling the air parameter (K ₁ ) in the first partial area (101) is additionally carried out by adapting at least one operating parameter of the first ventilation unit (11). Method according to one of the preceding claims, characterized in that a predefined interaction function is provided in the step of providing the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ). Procedure according to one of Claims 1 until 4 , characterized in that the step of providing the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) comprises the step of determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) with the following sub-steps: - detecting an initial value of a for determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) selected air parameter (L ₁ ) in the first partial area (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 parameter (L ₁ ) selected for determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) in the first sub-area (101) at a further, later point in time; - determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) on the basis of the detected initial value and the detected further value of the air parameter (L ₁ ) selected for determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) in the first partial area (101); wherein the air parameter (L ₁ ) selected to determine the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) in the first sub-area (101) is in particular the air parameter (K ₁ ) to be controlled in the first sub-area (101). procedure after claim 6 , characterized in that the step of determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) also includes detecting a time course of values of the air parameter (L ₁ ) selected to determine the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ). in the first sub-area (101), and that the sub-step of determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) also takes place on the basis of the recorded value profile over time, 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 recorded value curve over time. procedure after claim 6 or 7 , characterized in that the step of determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) further comprises providing the at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12) and optionally providing the at least one operating parameter the first ventilation unit (11), and in that the partial step of determining the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) additionally takes place on the basis of the provided operating parameter or the provided operating parameters. Procedure according to one of Claims 6 until 8th , characterized in that the first interaction function is determined when the first ventilation unit (11) is switched off. Method according to one of the preceding claims, characterized in that a value of the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) can be at least in a first or in a second value range, and in the step of controlling the air parameter (K ₁ ) in first partial area (101), the at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12) is adjusted and/or the second ventilation unit (12) is switched on if the value of the interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) is in the first value range and a value of the air parameter (K ₁ ) to be controlled in the first partial range (101) exceeds a first limit value, and/or if the value of the interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) is in the second value range and the value of the air parameter to be controlled (K ₁ ) in the first partial area (101) exceeds a second limit value. Method according to one of the preceding claims, characterized in that the air parameter (K ₁ ) to be controlled in the first partial area (101) is one of the following variables: - a concentration or a quantity of volatile organic compounds; - a concentration or amount of carbon dioxide; - a concentration or amount of oxygen; - a concentration or amount of aerosols; - a size or a concentration or an amount of solid particles; - an air temperature; - a humidity level. Method according to one of the preceding claims, characterized in that the first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) provided is updated at time intervals during the control of the air parameter (K ₁ ) in the first partial area (101), in particular at periodic time intervals or continuously. 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 air mode in which the introduction of the respective air flow takes place with the proviso that a to form the adjacent fresh air lake. procedure after Claim 13 , characterized in that values of the air parameter (K ₁ ) to be controlled are recorded in the first partial area (101) by at least one recording device of the first ventilation unit (11), which is arranged in a lower area of the first ventilation unit (11), the lower Area adjacent to the floor surface or this faces, such that the detection device can detect the presence of a fresh air lake. 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 fresh air mode in that the respective air flow is proportionately mixed with fresh outside air from an environment that is separated from the room (100) or the each air flow consists entirely of fresh outside air. Method according to one of the preceding claims, characterized in that at least the first or the second air flow is cleaned before it is introduced into the respective partial area (101, 102), in particular in such a way that volatile organic compounds and/or solid particles and/or aerosols and /or other impurities are removed from the respective air flow. Method according to one of the preceding claims, characterized in that the method additionally comprises the step of acquiring spatial data, and the step of controlling the air parameter (K ₁ ) in the first sub-area (101) also takes place as a function of the acquired spatial data, the spatial data being a or comprise several of the following information: - a number of persons present within the room (100); - a position and/or a movement of at least one person within the room (100); - A spatial distance from installation sites of the first and the second ventilation unit (12); - Dimensions of the room (100). Method according to one of the preceding claims, characterized in that the method further comprises the steps: - providing a second interaction function which changes an air parameter to be controlled in the second partial area (102) of the room (100) as a function of the at least one operating parameter of the first ventilation unit (11) describes; - Controlling the air parameter in the second partial area (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 (B ₂ ; Q ₂ ) of the second ventilation unit (12) as a function the provided second interaction function. System for controlling an air parameter (K ₁ ) within a room (100), comprising: - at least a first ventilation unit (11) which is set up to introduce a first air flow into a first partial area (101) of the room, and a second ventilation unit ( 12) which is set up to introduce a second air flow into a second partial area (102) of the room (100); - A control device coupled at least to the second ventilation unit (12), which is set up to use control commands to adapt at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12) and thus an air parameter (K ₁ ) to be controlled in the first partial area (101) of the room (100); characterized in that the control device is also set up to determine the at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12) as a function of a first interaction function (f ₁₂ ; g ₁₂ ; h ₁₂ ) provided in a memory device of the control device, which describes a change in the air parameter (K ₁ ) to be controlled in the first partial area (101) as a function of the at least one operating parameter (B ₂ ; Q ₂ ) of the second ventilation unit (12).

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