Indoor air purifier with low-pressure filter

Abstract

The invention relates to a filter device (100) for filtering air (103) in a room (200) of a building. The filter device (100) has a filter medium (101) and a fan unit (102), wherein the air (103) to be filtered can be filtered by means of the fan unit (102) through the filter medium (101). The filtering area of the filtering medium (101) is five times larger than the minimum airflow cross section in the fan unit (102); the fan unit (102) is designed such that an air flow angle (104) between the direction of flow of the air (103) entering the filter medium (101) and the filter surface of the filter medium (101) differs from 90 degrees and the sound pressure level (100) of the filter device (100) at a distance of one meter from the filter device (100) is lower than 48 dB when the volume flow rate of the air (103) driven by the fan unit (102) exceeds 50 m3 / h, wherein the filter medium (101) is configured such that a pressure drop of air (103) flowing through the filter medium (101) is less than 450 Pascals.

Description

Technical Field

[0001] The invention relates to a filter device for filtering air in a room of a building and a method for filtering air in a room of a building using a filter device. Background Art

[0002] The filter system in the indoor air system is responsible for the ventilation and air exchange of the rooms in the building and filters the pollutants in the air. In this case, the primary filter facility is used in the building, which includes, for example, the central ventilation facility and the controlled apartment ventilation device in the building. In this case, the primary filter facility can have a connection to the outside air. In addition, the secondary filter facility is usually used as a supplement to the primary filter facility. The secondary filter facility includes, for example, an air circulation system with a filter device and is configured to be installed in the room (e.g., a room air purifier).

[0003] Secondary filtration systems for air purification usually have a smaller air throughput than primary ventilation systems, so that, for example, aerosols in the air can only be filtered inadequately in order to reduce any viral contamination in the contaminated room air to a sufficiently low level in a sufficiently short time. Aerosols exhaled by people can contaminate the room air and involve an infection risk for other people present. On the other hand, more powerful secondary ventilation systems are usually loud, so people in the room find this disturbing.

[0004] This applies in particular to offices, event halls, conference rooms and training rooms with a high number of people per square meter. In order to achieve meaningful aerosol removal in such environments, the required air throughput increases not only linearly, and the acoustic load associated with it also increases exponentially. Summary of the invention

[0005] One object of the present invention is to provide a filter device with high performance and low operating noise.

[0006] According to a first aspect of the invention, a filter device for filtering air in a room of a building is described. The filter device has a filter medium and a fan unit, wherein the air to be filtered can be filtered by flowing through the filter medium with the aid of the fan unit. The filter area of ​​the filter medium is five times larger than the smallest air flow cross section in the fan unit, so that the air flow angle between the flow direction of the air when entering the filter medium and the filter surface of the filter medium is different from 90 degrees and the volume flow of the air driven by the fan unit exceeds 50m 3 The sound pressure level of the filter device at a distance of one meter from the filter device is lower than 48 dB at a rate of 1 / h, wherein the filter medium is configured such that the pressure drop of the air flowing through the filter medium is less than 450 Pascal.

[0007] According to another aspect, a method for filtering air in a room of a building using the above-described filter device is shown.

[0008] The filter device according to the present invention is generally used for filtering and cleaning air in buildings or for cleaning air in production processes in factories.

[0009] The filter device has, for example, a housing in which a filter medium is arranged or a plurality of filter media are arranged in series along the flow direction of air through the filter device or parallel to the flow direction. The filter medium can be arranged to be replaceable.

[0010] The filter medium of the filter device has, for example, a flat filter material fixed in a surrounding support frame. The filter medium can be designed as a bag filter, wherein a plurality of bags of the filter medium are fixed in a support frame and an air flow is introduced into the bags in order to filter the inflowing air. The filter medium can also be designed as a cartridge filter, a bag filter, a candle filter, a compact filter and a HEPA filter.

[0011] The fan unit of the filter device in particular draws the air to be filtered into the filter device so that the air flows through the filter medium. The fan unit can, for example, have an axial or radial compressor and accordingly the air can flow along a translational flow straight line or at right angles. The fan unit can in particular be controlled by a control unit so that the air flow through the filter device can be adjusted. The fan unit in particular has a secondary air circulation system for a filter device installed in a room (so to speak, a "room air cleaner"). The filter device can be mobile or stationary.

[0012] According to the invention, the filter area of ​​the filter medium is at least five times larger than the minimum air flow cross section in the fan unit. The minimum air flow cross section describes the smallest flow cross section in the air path of the air through the filter device, i.e. between the air inlet and the air outlet into and out of the filter device. The smallest flow cross section can be present, for example, in the air channel of the filter device, in which the flow generating element of the fan unit (e.g. a ventilator) is arranged.

[0013] The filter medium is arranged in particular downstream of the minimum air flow cross section. Between the minimum air flow cross section and the filter medium, the air flow cross section of the air path through the filter device is expanded so that the air strikes the filter medium with a filter area that is five times larger than the minimum air flow cross section in the fan unit. Alternatively, the filter medium can also be installed in front of the fan, i.e. the system is operated in suction mode. This has the advantage that the fan is less soiled and the air inlet dampens sound better, so that it can be arranged closer to the person's head without increasing noise emissions.

[0014] There is only an expansion of the airflow path between the filter medium and the minimum airflow cross section, so that the linear part of the air flow relative to the filter medium at the filter inlet has a flow direction that differs from 90 degrees to the filter surface of the filter medium. In particular, the filter surface is parallel to the minimum airflow cross section or to the airflow cross section before the expansion of the airflow path begins. In other words, a first airflow cross section of the expansion area of ​​the air path is parallel to another airflow cross section of the expansion area, which is configured downstream, at which the filter surface of the filter medium is present.

[0015] The expansion region also forms a long relaxation region, for example without a hard transition after the fan. Particularly good results have been found when the relaxation region is larger or longer than the cross section of the air flow, in particular larger than twice or even four times the cross section of the air flow.

[0016] With this expansion, it is achieved that the flow direction of the air at the filter surface at the filter inlet has a filter inlet angle different from 90 degrees. In particular, this applies to 95%, in particular 99%, of the volume flow of the air flowing relative to the filter surface.

[0017] If the air guide is designed in such a way that the main flow direction of the air at the filter surface at the inlet of the filter medium is not guided in a straight line through the filter medium, but is mostly first deflected, for example by more than 10 degrees, a rotational movement is introduced precisely for the larger particles or aerosol components of the air, which achieves a better separation rate on the filter (especially in combination with a multi-layer porous filter together with a cyclonic separation effect). The cyclonic separation effect allows a more stable binding of foreign bodies. The inertial movement of the heavier air flow components achieved by the air deflection leads to a better adhesion to the filter material in the filter medium and thus a better separation rate.

[0018] This expansion of the flow cross section enables volume flows of the air driven by the fan unit to exceed 50 m 3 / h, the sound pressure level of the filter device at a distance of one meter from the filter device (especially from the air outlet and / or the air inlet of the filter device) is lower than 48 dB.

[0019] Here, the filter medium is configured (e.g. by material / pore density, material selection and / or thickness of the filter medium) such that the pressure drop of the air flowing through the filter medium (between the inlet into the filter medium and the outlet from the filter medium) is less than 450 Pascals. The filter performance of the filter device according to the invention, in particular the filter medium, is measured, for example, according to EN ISO 16890 and is better than 50% for one of the classes "ISO Coarse", "ISO ePM10", "ISO ePM2.5" or "ISO ePM1".

[0020] The pressure drop is thus reduced by the generous dimensioning of the filter medium and its filter area and by the structure of the filter medium. A high air throughput causes the virus-contaminated aerosol to first settle on the filter medium, but then be dried quickly by the high air flow. As a result, enveloped viruses in particular die quickly due to their drying.

[0021] If the filter area is larger, in particular significantly larger, than the inflow cross section of the air to be cleaned or the air flow cross section in the fan unit, a change in the speed of the air flow also occurs. Highly accelerated heavy solid particles (or aerosols) reduce their speed more slowly than light air molecules. This means that they hit the filter membrane relatively strongly, which in turn leads to good adhesion at the filter (and therefore particularly good consumption). It has been shown that good sound values ​​can be achieved if the filter area is more than 5 times, in particular more than 10 times, in particular more than 20 times, preferably more than 40 times larger than the minimum air flow cross section in the fan unit. A corresponding increase in the filter area leads to a further reduction in the noise level of the flowing air and an improved filter performance.

[0022] According to another exemplary embodiment, the filter medium is configured to have a diameter greater than 1 m 2 , especially greater than 2m 2 , especially greater than 4m 2 , especially greater than 8m 2 The (absolute) filter area. The filter area is configured as the area of ​​the filter medium through which the air flows. In this case, the filter area at the inflow side of the filter medium is, for example, the same size as the filter area at the outflow side of the filter medium.

[0023] The filter device has in particular an outlet opening through which the filtered air can flow out. The filter medium can be arranged in the filter device so that the filter surface is visually perceptible from the outside of the filter device. In other words, the filter surface is freely accessible from the outside without any noise-generating flow obstacles being provided for the outflowing air.

[0024] With such a large filter area of ​​the filter medium, the diffuser for the sound generated by the air flow becomes larger. In addition, due to its size, the filter area of ​​the larger filter area can be farther from the human ear, so that the filter area is further away from the ear that perceives the sound and leads to an overall smaller perceptible sound level. In combination with the dimensioning of the filter medium and the configuration of the filter medium, with regard to the pressure drop of the air flowing through (e.g. via the material selection and the thickness of the filter medium), technical measures are described according to the invention, which lead to high filter performance with low noise levels.

[0025] The filter surface designed in this way can contain stabilizing, fastening or reinforcing elements on the inner or outer side (e.g. a supporting frame, a fixing rail into which the filter medium can be inserted or a plastic band connected to the filter for fastening) and / or be designed accordingly. This counteracts vibrations or oscillations of the filter medium in the flowing air and thus indirectly reduces noise.

[0026] The invention relates in particular to a secondary filter arrangement which, due to a filter medium with a particularly low pressure drop, enables filtering of larger air volumes with low, low noise emissions and in particular achieves an associated removal of aerosols.

[0027] According to another exemplary embodiment, the filter area of ​​the filter medium is constructed to be larger than the minimum air flow cross-section in the fan unit, so that the sound pressure level of the filter device at a distance of one meter is below 45dB, in particular below 38dB, in particular below 32dB, further in particular below 28dB.

[0028] According to another exemplary embodiment, the filter medium is configured such that the pressure drop of the air flowing through the filter medium is less than 250 Pa, in particular less than 150 Pa, further in particular less than 70 Pa or 30 Pa.

[0029] According to another exemplary embodiment, the filter device is configured such that the air volume per square meter of filter area per hour (ie, the filter surface load) is less than 600 m 3 / (m 2 h) Especially below 140m 3 / (m 2 h), below 85m 3 / (m 2 h) or less than 50m 3 / (m 2 h),

[0030] Of course, the volume flow rate of the air (103) passing through the filter device (100) is in the range of 0.1 to 5 m / s, in particular in the range of 0.2 m / s to 3.4 m / s, and further in particular between 0.3 m / s and 2.8 m / s. These characteristic values ​​can be adjusted in particular by selecting the filter size, the filter material and the design of the fan unit.

[0031] According to another exemplary embodiment, the filter device has a microphone unit and a sound generator, wherein the microphone unit is arranged to measure the sound level of the air before the fan unit and / or after the filter medium, wherein the sound generator is configured to generate a counter-sound based on the measured sound level. Active noise suppression can therefore be integrated. Here, the sound generator generates a sound that is set so that it is adjusted with respect to the sound generated by the air flow in a destructive interference. In addition, a counter-sound corresponding to the interfering sound but with an opposite polarity is also generated. Therefore, the sound generator generates a counter-sound or modulates the counter-sound based on the air flow sound recorded by the microphone unit. This has the advantage that the sound generator implicitly masks the noise of the air flow as a sound source.

[0032] According to another exemplary embodiment, the filter device, such as its housing, has an air outlet for blowing out air, wherein the filter device is configured so that the air outlet is 1m lower, especially 0.5m lower, than the ground (or the standing surface on which the filter device is placed). Additionally or alternatively, the filter device is configured so that the air outlet is 1.8m higher, especially 2m higher, than the ground. In most installation locations for secondary filter systems, most people located therein have their ears more than one meter above the ground and less than 2m or 1.80m. This allows for structural optimization so that strong noise emission components such as ventilators or suction openings or air outlets are constructed at the ground or towards the ground or at a height of 1.80m above the ground.

[0033] Accordingly, the noise load can also be measured from one meter and less than 2 meters from the ground. By placing the filter device with an outlet area located in an area more than one meter from the ground, it is possible to use the sound diffusion effect of a much larger filter area relative to the minimum air flow cross section (for example in a ventilator) for noise reduction. The same problem also applies to noise sources installed more than 1.8 meters from the ground. Thus, for example, a filter device with a housing having a ceiling light function and a filter function is an ideal configuration in terms of noise.

[0034] According to another exemplary embodiment, the filter device has a control unit for controlling the fan unit, wherein the control unit is connected to the fan unit for wireless or wired signal exchange of control commands. The control unit can be integrated in the filter device and control the fan unit. In addition, the control unit can constitute a central control unit, which is arranged outside the filter device and controls a plurality of filter devices, for example.

[0035] According to another exemplary embodiment, the filter device has a device for determining at least one air parameter (e.g. CO content, CO2 content, relative humidity, air pressure, O2 content, temperature, PM content, aerosol concentration, type and / or concentration of foreign matter) of the air to be filtered at the filter device or an operating parameter of the filter device. The control unit is connected for wireless (or wired) signal exchange of sensor signals of the sensor element. The sensor element can, for example, provide air quality-related and / or filter-related data to the control unit, in particular by means of RFID, NFC, Bluetooth, WLAN or building management technology protocols. The control unit is particularly configured so that a warning signal can be generated based on the filter-related data and / or measures can be taken involving the flow rate through the filter device (e.g., control of the fan unit) or the blocked or released functions of the filter device.

[0036] The filter device and the control unit can each have an antenna or a conductor-based system, which signals the filter device that it is ready to exchange data. These data can not only relate to parameters related to the airborne substances of the air, but can also contain information and details of the filter device. Thus, for example, the volume of air passing through the filter device can be adapted according to the performance of the filter device used. In addition, in the case of exceeding the operating time or occupancy density of the filter medium, a signal can be emitted, which can be interpreted as a maintenance signal or used as a control signal to reduce or increase the air throughput. A design variant of the transmitting device in the filter device and / or the control unit can be an RFID transponder (which, for example, also has the filter data in encrypted form). In addition, other communication mechanisms can also be used, such as NFC, Bluetooth, WLAN, etc. In addition to proprietary protocols, the bus systems of building management systems (LON, EIB, etc.) can also be used for wired communication.

[0037] Since secondary filter devices are usually operated without maintenance, high filter occupancy rates (due to filter changes that should have been made but were not carried out) are another source for higher noise emissions (e.g. because the airflow is monitored and the fan is then operated at a higher power). For this reason, filter occupancy monitoring is installed in the filter device, in particular with the possibility of transmitting the detected faults further than the local environment of the filter device (e.g. wired or wireless transmission of the fault message "filter full / replace"). In particular, an external service team can be requested and / or invited in this way.

[0038] According to another exemplary embodiment, the sensor element is a dynamic pressure gauge and is particularly configured so that the static pressure upstream of the filtration and the static and dynamic pressures downstream of the filter medium can be measured. If the velocity of the air flow is high enough, the pressure difference between the normal pressure sampling point upstream of the filter medium and the dynamic pressure tube (or Pitot tube) downstream of the filter medium can be measured. The pressure in the Pitot tube is given by the sum of the static pressure and the dynamic pressure and is therefore higher than the pressure in the normal pressure sampling point in front of the filter medium. This configuration produces a reverse pressure difference or a negative pressure difference on the filter medium and allows the detection of supply line blockages or valve flap failures. This embodiment may be particularly suitable for retrofitting aging facilities. By using a control unit in the filter device, the response and / or limit values ​​in the filter device can be parameterized from the outside.

[0039] For example, the sensor element can have a microphone and detect the noise level in the room and the location of the noise source. By measuring and evaluating the noise level in the room, the number of people who are actively talking in the room and the sound intensity can be inferred and the ventilation power of the fan unit can be adapted to this by the control unit, because the aerosol emission caused by people increases with the volume of speech. In other words, the control of the ventilation power can be adjusted by the noise level in the room. The more people talk or talk loudly, the more aerosol is emitted and the fan power can therefore be higher, because then the additional sounds of the equipment such as the fan unit will not be perceived and will not cause interference. If one or more people are sitting quietly in the room, the ventilation power will be reduced, because silence is necessary to work concentratedly, but hardly any aerosol is emitted.

[0040] According to another exemplary embodiment, the control unit obtains a unique ID from the filter device, wherein the unique ID contains information about the location of use of the filter device. The control unit receives the unique ID via NFC, Bluetooth, WLAN, a proprietary protocol or a protocol of a building management system, in particular LON or EIB, wherein the operation and / or configuration of the filter device can be adjusted based on the unique ID. In another particularly preferred embodiment, the unique ID has information about the installation location of the filter device in the filter system. This ID allows the preselection of operating parameters required for a specific operation from the preconfigured operating mode of the filter device, or the retrieval of stored data of the system configuration. In particular, when an encrypted protocol is used, reconfiguration can be avoided when the filter is replaced, and "plug and play" can be achieved. When replacing, the corresponding data can be transferred from the filter device or transmitted via the cloud. The unique ID can be transferred to the filter device using mechanisms known to those skilled in the art, using QR codes, barcodes, OCR fonts (and their machine-readable font successors), RFID, NFC, Bluetooth, WLAN, proprietary protocols or protocols of a building management system (LON, EIB, etc.). This mechanism can also provide a filter device in which the function is activated only when a part of the unique ID belongs to the agreed scope of delivery.

[0041] According to another exemplary embodiment, the filter device also has a data storage unit, which is connected to the control unit, the fan unit and the sensor element for exchanging data, wherein the data is protected in particular by means of a certificate and / or encryption. The data is in particular selected from the group of measured values ​​consisting of the air flow rate through the filter device, the air temperature, the air pressure (in particular absolute pressure and / or pressure difference), the filter occupancy rate of the filter medium, the air humidity, the aerosol load of the air, the PM content and / or the foreign matter share, and the measurement position of the air measurement. Under demanding operating conditions, it is precisely of interest that the various acquisition details (such as measured values) can be parameterized. On the one hand, this involves the details of the measurement method, and on the other hand, it also involves the parameters to be recorded (such as air flow rate, temperature, pressure (in particular absolute pressure and / or pressure difference), filter occupancy rate, humidity, aerosol load, PM content, and in particular which diameter grade is what). Such a data set can then be transmitted again by means of communication or read out only after the service life of the filter has ended.

[0042] According to another exemplary embodiment, the sensor element is configured to determine the energy consumption and / or CO2 footprint of the filter device based on the air parameters and / or operating parameters of the filter device, in particular the filter occupancy rate and / or the operating time of the filter medium. The air parameters and / or operating parameters of the filter device are particularly selected to determine the suggestions about filter replacement and / or filter cleaning, and in particular, the individual parameters can be configured here. For example, (possibly in real time) the energy consumption and CO2 footprint are permanently and continuously optimized. It may be advantageous to replace the filter before the "end of service life" (such as the maximum filter occupancy rate) because the pressure drop on the filter that increases exponentially appears in the service life range through the filter occupancy rate. According to the energy cost of the filter device or the requirements for the CO2 footprint, the filter replacement before the pressure difference rises sharply can include cost or result improvement within the service life of the filter. However, another design scheme can also be a notification to the user, for example, notifying the user that additional ventilation through the window opening is an energy optimization measure, or for example, in the case of correspondingly determining the improvement of air quality, the secondary filter device can, for example, reduce air circulation and thus reduce energy and noise.

[0043] According to another exemplary embodiment, the control unit is configured to variably control the filter device, in particular the fan unit, so that the future energy availability and / or the current and / or future energy consumption of the filter device can be taken into account. The control unit uses the approval function to automatically or semi-automatically control the filter device based on the future energy availability and / or the current and / or future energy consumption of the filter device and / or the building. In another preferred embodiment, the control unit or the sensor element determines data about the energy consumption and / or the CO2 footprint of the filter device and / or the fan unit. As the occupancy rate increases, the filter medium requires more and more energy for the intended use, because the pressure drop ΔP on the filter medium increases due to the filter occupancy rate. Based on the knowledge of the energy costs and the CO2 footprint of the filter medium due to its production, a recommendation about the optimal filter replacement time (or cleaning time) can be determined and communicated based on this data, preferably, individual parameters, such as energy costs, savings potential, CO2 savings, CO2 certificate costs, etc. can be configured or determined.

[0044] According to another exemplary embodiment, the filter medium has a filter material, which includes a layer of fleece, in particular a plurality of layers of fleece, wherein the filter medium can be arranged replaceably in the filter device. The filter medium is in particular a disposable filter. The fleece consists of fibers of limited length, continuous fibers (filaments) or short-cut yarns, which are assembled and connected to form a fleece (fiber layer, fiber fleece). By linking the fibers, an air-permeable material with narrow, small-pore air channels is provided, thereby achieving a good filtering effect, in particular for air particles.

[0045] Since the replaceable filter medium (especially as a disposable filter) does not have to be precisely matched to the surrounding housing of the filter device, it is also advantageous that the filter medium prevents possible air resonance. In the filter material (such as a woven, punched, etched or drilled filter) composed of regularly arranged filter media, there is the possibility that resonance and negative effects (noise, especially the re-release of embedded pollutants when the physical measurement value changes when the facility is started and stopped) are produced due to the self-organization effect of the airflow. It has been shown that in the solution according to the present invention, the use of a flannel layer suppresses this vibration effect. This suppression occurs in the following way, the fibers are irregularly and randomly deposited and adhered. This irregularity reduces the self-organization potential in terms of vibration. When multiple flannel layers are used in the structure of the filter medium, especially when they have at least slightly different flannel materials or flannel layers, this suppression can be enhanced. Differences can be generated by manufacturing flannel materials.

[0046] According to another exemplary embodiment, the filter medium has at least two fleece layers and a filter membrane arranged between the fleece layers, the fleece layers being arranged one above the other to form a layer composite. In particular, the middle filter membrane of the layer composite has a larger surface than the two outer fleece layers.

[0047] According to another exemplary embodiment, a first direction (x-axis) and a second direction (y-axis) span an (xy) plane, wherein the intermediate filter membrane is designed with corrugated segments, such that the corrugated segments are arranged one behind the other in the first direction. The corrugated segments extend irregularly and asymmetrically relative to one another in the plane, wherein the filter medium is arranged such that air can flow through the filter medium in the first direction or in the second direction.

[0048] For example, the first direction is the air inflow direction of the air. The corrugated section extends in the second direction transversely to the first direction. The asymmetry of the corrugated arrangement and shape can be used for vibration suppression. Alternatively, the filter body can also flow in along the Y direction and thus parallel to the extension of the wave. Therefore, the corrugated section constructs a shark skin-like rib structure, for example, which promotes a reduction in flow resistance. Depending on the inlet conditions into the filter medium (inflow cross section, volume flow, depth of the filter material to be flowed through), one or another design may be particularly advantageous. The asymmetry of the wave arrangement can be achieved by a self-organized compression process, in which the feed rate of the filter membrane is significantly higher than the feed rate of the two covering flannels. The asymmetry of the wave arrangement is generated by thermally fixing the three layers at a predetermined time point. In addition to the advantages already described, this asymmetry acts stably on the bending in the xy plane.

[0049] The filter membranes are stacked in a corrugated shape and connected to the covering fleece above and below for stabilization (glued, welded, stapled, etc.). This ensures that sufficient open membrane area is available during the service life of the filter medium and that it does not flatten or fold during use and thus additionally reduce the passage.

[0050] If a non-planar filter membrane is additionally added to the filter medium, the above-mentioned effect is additionally intensified. If the filter medium does not have sharp edges (for example in pleated cartridge filters), it has a noise-reducing effect. A good design of this "angle-free" design is a sinusoidal impact zone.

[0051] A higher resistance to the air flowing through is generated by the corrugated filter structure with the rib structure. If the filter medium is arranged longitudinally or obliquely to the airflow at this time, an air flow with a lower speed surrounding the main airflow (or if the filter medium is only partially installed, it accompanies the main airflow laterally) is generated. The sound of the airflow is suppressed by the reduced speed. When the air flows along the corrugated filter structure, similar to in a duct silencer or an absorption silencer, a limited amount of airflow flows through the corrugated filter medium, thereby reducing the mass flow of the main airflow, and as mentioned above, the flow speed of the main airflow is reduced, thereby suppressing the sound of the airflow.

[0052] According to a further exemplary embodiment, the filter medium has a thickness of 2 mm to 10 mm, in particular 3 mm to 7 mm, and / or the number of corrugations is between 0.5 and 3 corrugations per centimeter.

[0053] This allows a filter performance similar to a HEPA filter, but with a pressure drop within the range of a normal F7 filter (ie within the operating parameters of the solution according to the invention).

[0054] According to a further exemplary embodiment, the surface of the filter membrane is more than 30%, in particular more than 80%, further in particular more than 200% larger than the corresponding surface of the outer fleece layer. In particular, a good reduction in sound emissions is achieved when the surface area of ​​the filter membrane is more than 30%, in particular more than 80%, preferably more than 200% larger than the filter surface, in particular the filter surface of the outer fleece layer. If the filter membrane is not a planar element (with possible sound reflection effects), this can be explained by the diffusion effect of the filter membrane.

[0055] According to another exemplary embodiment, the filter device has a weighing device, which is arranged to weigh the occupancy of the filter, in particular, so that the measured value distortion caused by the pressure of the air flowing through the system can be compensated. With the corresponding additional mechanism, the measured value distortion of the sensor element caused by the pressure of the air resistance in the operation of the filter device can be compensated. This also allows the high filter occupancy rate of the filter medium to be determined for the operating mode of the filter device under the condition of low (small) volume flow, which does not cause the pressure difference monitoring of the filter medium to be triggered in the usual filter monitoring. In particular, in the secondary filter device, efforts are made to work with a low and small pressure difference in order to keep the noise level low and small. Despite the very small pressure difference, this detail still allows the filter occupancy rate to be reliably measured. In particular, in the installation state of the filter medium in the housing of the filter device, the weighing device can have ground contact, and thus the weight of the filter medium is introduced into the ground. The weight measurement of the filter medium can thus be performed.

[0056] According to another exemplary embodiment, the filter medium has a filter material that is hydrophobic and / or contains natural fibers or polyolefins, especially polypropylene, and in particular the filter contains cellulose, cotton and / or hemp. If the airflow to be filtered is loaded with a high aerosol load, the known filter may be prone to sudden moisture penetration. On the one hand, this will statically increase the pressure drop on the filter, and on the other hand, due to the very fast change of pressure conditions, it will also dynamically make the control speed of the subsequent flow control performed by VAV too fast. The solution according to the present invention can solve this problem by appropriate material selection of the filter material. Use hydrophobic materials (such as polyolefins, especially polypropylene, which are essentially free of polar groups) and / or use absorbent materials with special (such as low, small) swelling tendencies (such as natural fibers, especially cellulose fibers, cotton or hemp). This reduces the tendency of the filter opening to fill with micron- or nano-scale water droplets. It has been shown that the fungicidal, virucidal and bactericidal properties of hemp are suitable and make it an ideal filter component. This reduction in the pressure drop also leads to a reduction in the degree of positional instability of the measurement (ie, with a smaller pressure drop, more air is sucked in and the spatial image associated with the measured values ​​is therefore larger than would be expected in a composite overall evaluation).

[0057] According to another exemplary embodiment, the filter medium has a vibroacoustic metamaterial. The vibroacoustic metamaterial consists of a periodic arrangement of small resonator structures distributed in an array, which themselves are constructed from a variety of materials. Here, the order of magnitude of the resonators can be less than half the wavelength of the vibration to be reduced. The vibroacoustic metamaterial can be manufactured cost-effectively. The vibroacoustic metamaterial can lay a part of the air guide and thus suppress the sound. In addition, they can also be adjusted to the most disturbing natural resonance frequency of the secondary filter device and, depending on the embodiment, further reduce the sound emissions by 1.5 to 10 dB.

[0058] According to another exemplary embodiment, the filter device has a housing in which the filter medium and the fan unit are arranged. The housing can be arranged in a room of a building and be configured as a room divider, for example. In addition, the housing can have a lamp and be configured as a light source. In addition, the housing can have a loudspeaker. In addition, the housing can have a sound absorbing layer and can be configured as a silencer and / or a sound absorber. Therefore, in another particularly preferred embodiment, the secondary filter device can be associated with at least one additional room-related additional function. This can be a room design element, a room divider, a light source, a loudspeaker or a sound absorber. Compared to separate independent independent devices, material savings are achieved through this combination (for example for the housing).

[0059] When reducing noise, it is important that the design of the filter device must be targeted to distinguish between laminar flow and turbulent flow and to minimize the corresponding sound emission. It is thus recognized that, through the above-mentioned measures according to the present invention, for example, replaceable filters (especially disposable filters) do not have to be precisely matched to the surrounding containers, and possible air resonances can still be prevented. In a filter device consisting of regularly arranged filter media (such as woven, punched, etched or drilled filters), there is the possibility that resonance and thus negative effects (noise, re-release of released pollutants [especially when starting and stopping facilities], variance of physical measurements, etc.) may be generated due to the self-organization effect of the airflow. It has been shown that in the solution according to the present invention, only one layer of velvet is used to suppress this vibration effect. Of course, in the case of multiple velvet layers in the structure of the filter medium, especially if they are at least slightly different, this suppression will be enhanced. This is explained by the manufacture of the velvet material. Usually, for this reason, the fibers are irregularly / randomly deposited and adhered. This irregularity reduces the self-organization potential in terms of vibration, which may cause more noise.

[0060] For acoustic reasons, particularly large filter surfaces are also intended as silencers. In particular, in combination with special acoustic materials (e.g. melanin resins), a particularly good degree of sound suppression (for sounds from the outside and for the noise of the filter installation itself) can be achieved with a still sufficient volume flow.

[0061] It should be noted that the embodiments described herein are only a limited selection of possible embodiment variants of the present invention. Therefore, the features of the various embodiments can be combined with each other in a suitable manner so that a large number of different embodiments can be considered as obviously disclosed using the embodiment variants clearly defined here for those skilled in the art. In particular, some embodiments of the present invention are described using device claims, and other embodiments of the present invention are described using method claims. However, it will be immediately clear to those skilled in the art after reading this application that, unless otherwise explicitly stated, in addition to the combination of features belonging to one type of inventive subject matter, any combination of features belonging to different types of inventive subject matter is also possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to further explain and better understand the present invention, embodiments will be described in more detail below with reference to the accompanying drawings.

[0063] Figure 1 A schematic diagram showing a filtering device according to an exemplary embodiment of the present invention is shown.

[0064] Figure 2 A schematic diagram of a room with a filtering device according to an exemplary embodiment of the present invention is shown.

[0065] Figure 3 A schematic diagram of a filter medium having a corrugated filter membrane according to an exemplary embodiment is shown.

[0066] Figure 4 A schematic diagram of a filter media having a corrugated filter membrane and a corrugated cover layer is shown according to an exemplary embodiment.

[0067] Figure 5 A schematic diagram showing a wave shape of a filter media according to an exemplary embodiment.

[0068] Figure 6 A schematic diagram of a filter medium having a dynamic pressure gauge according to an exemplary embodiment is shown.

[0069] Figure 7 A graph showing the pressure drop of air flowing through a filter versus the operating time of the filter medium.

[0070] Figure 8 A schematic diagram of active noise reduction according to an exemplary embodiment is shown. DETAILED DESCRIPTION

[0071] Identical or similar parts in different figures are provided with the same reference symbols. The representation in the figures is schematic.

[0072] Figure 1A room 200 for filtering a building is shown (see Figure 2 ) The filter device 100 comprises a filter medium 101 and a fan unit 102, wherein the air 103 to be filtered can be filtered by flowing through the filter medium 101 with the aid of the fan unit 102. The filter area of ​​the filter medium 101 is five times larger than the minimum air flow cross section in the fan unit 102, so that the air flow angle 104 between the flow direction of the air 103 when entering the filter medium 101 and the filter surface of the filter medium 101 is different from 90 degrees, and the volume flow rate of the air 103 driven by the fan unit 102 exceeds 50m 3 / h, the sound pressure level of the filter device 100 at a distance of one meter from the filter device 100 is below 48 dB, wherein the filter medium 101 is configured such that the pressure drop of the air 103 flowing through the filter medium 101 is less than 450 Pascals.

[0073] The filter device 100 has, for example, a housing 120 in which a filter medium 101 is arranged or a plurality of filter media 101 are arranged in series along the flow direction of air 103 through the filter device 100 or parallel to the flow direction. The filter medium 101 may be replaceable.

[0074] The filter medium 101 of the filter device 100 has, for example, a flat filter material fixed in a surrounding support frame. The filter medium 101 can be designed as a bag filter, wherein a plurality of bags of the filter medium 101 are fastened in a support frame and an air flow is introduced into the bags to filter the inflowing air 103.

[0075] The fan unit 102 of the filter device 100 in particular draws the air 103 to be filtered into the filter device 100 so that the air 103 flows through the filter medium 101. The fan unit 102 can, for example, have an axial or radial compressor, and the air 103 flows along a translational flow straight line or at right angles accordingly. The fan unit 102 can in particular be controlled by a control unit 108 so that the air flow through the filter device 100 can be adjusted. The fan unit 102 is in particular a secondary air circulation system (so to speak, a "room air purifier") with a filter device for installation in the room 200. The filter device 100 can be mobile or fixed.

[0076] According to the invention, the filter area AF of the filter medium 101 is five times larger than the minimum air flow cross section AL in the fan unit 102. The minimum air flow cross section AL describes the minimum flow cross section of the air 103 in the air path through the filter device 100, i.e. between the inlet of the air 103 into the flow channel 111 of the fan unit 102 and the outlet of the air 103 from the flow channel 111 of the fan unit 102. The minimum flow cross section A1 can be present, for example, in the air channel of the filter device 100, in which a flow generating element (e.g. a ventilator) of the fan unit 102 is arranged.

[0077] The filter medium 101 is arranged downstream, in particular, after the minimum air flow cross section AL. Between the minimum air flow cross section AL and the filter medium 101, the air flow cross section of the air path through the filter device 100 is expanded, so that the air 103 strikes the filter medium 101, which has a filter area AF that is 5 times larger than the minimum air flow cross section AL in the fan unit 102.

[0078] There is only an expansion of the airflow path between the filter medium 101 and the minimum airflow cross section AL, so that the linear part of the air flow relative to the flow direction of the filter medium 101 in the case of the filter inlet is different from 90 degrees to the filter surface of the filter medium 101 and has an airflow angle 104 between the airflow direction and the filter surface that is not equal to 90 degrees. In particular, before the expansion of the airflow path begins, the filter surface is parallel to the minimum airflow cross section AL or parallel to the airflow cross section AL.

[0079] The expansion area also forms a long relaxation area without, for example, a hard transition after the fan unit 102. Particularly good results have been found when the relaxation area is larger or longer than the cross section AL of the air flow, in particular more than twice, or even four times the cross section of the air flow.

[0080] If the air guide is designed so that the main flow direction of the air 103 at the filter surface at the inlet of the filter medium 101 is not guided in a straight line through the filter medium 101, but is mostly deflected first, for example by more than 10 degrees, then for larger particles or aerosol components of the air 103, a rotational movement is introduced, which achieves a better separation rate on the filter (especially in combination with a multi-layer porous filter together with a cyclonic separation effect). The cyclonic separation effect allows a more stable binding of foreign matter. The inertial movement of the heavier air flow components achieved by the air deflection leads to a better adhesion to the filter material in the filter medium 101 and thus a better separation rate.

[0081] By means of this expansion of the flow cross section, a volume flow of the air 103 driven by the fan unit 102 of more than 50 m 3 / h, the sound pressure level of the filter device 100 at a distance of one meter from the filter device 100 (especially from the air outlet and / or the air inlet of the filter device) is lower than 48 dB.

[0082] Since the filter area AF is significantly larger than the inflow cross section or air flow cross section AL of the air 103 to be cleaned in the fan unit 102, a velocity change of the air flow is also produced. Highly accelerated heavy solid particles (or aerosols) reduce their velocity more slowly than light air molecules. This means that they hit the filter medium 101 relatively strongly, which in turn leads to good adhesion at the filter (and therefore to particularly good consumption).

[0083] The filter device 100 has a control unit 108 for controlling the fan unit 102 , wherein the control unit 108 is coupled to the fan unit 102 for wireless or wired signal exchange of control commands. The control unit 108 may be integrated in the filter device 100 and control the fan unit 102 .

[0084] The filter device 100 also has a sensor element 109 for determining at least one air parameter of the filtered air 103 at the filter device 100 (e.g. CO content, CO2 content, relative air humidity, air pressure, O2 content, temperature, PM content, aerosol concentration, type and / or concentration of foreign matter) or an operating parameter of the filter device 100. The control unit 108 is connected for wireless (or wired) signal exchange of sensor signals of the sensor element 109. The control unit 108 is configured in particular such that a warning signal can be generated based on the filter-related data and / or measures can be taken relating to the throughput through the filter device 100 (e.g. control of a fan unit) or to blocked or released functions of the filter device 100.

[0085] The filter device 100 and the control unit 108 may each have an antenna or a conductor-based system which signals the filter device 100 that it is ready to exchange data.

[0086] The filter device 100 also has a data storage unit 110, which is connected to the control unit 108, the fan unit 102 and the sensor element 109 for exchanging data, wherein the data can be protected by means of certificates and / or encryption. The data is especially selected from the group of measured values ​​consisting of the air flow rate, air temperature, air pressure (especially absolute pressure and / or pressure difference), filter occupancy rate of the filter medium, air humidity, aerosol load, PM content and / or foreign matter content of the air 103, and the measurement position of the air measurement through the filter device 100. Under demanding operating conditions, it may be of interest that the individual acquisition details (such as measured values) can be parameterized. On the one hand, this involves the details of the measurement method, and on the other hand, it also involves the parameters to be recorded (such as air flow rate, temperature, pressure (especially absolute pressure and / or pressure difference), filter occupancy rate, humidity, aerosol load, PM content, and especially which diameter grade is what). Such a data set can then be transmitted again by means of communication or read out only after the filter service life ends.

[0087] The filter device 100 also has a weighing device 113, which is configured to weigh the occupancy of the filter, in particular so that the measured value distortion can be compensated by the pressure of the air 103 flowing through the system. With corresponding additional means, it is possible to compensate for the measured value distortion of the sensor element 109 caused by the pressure of the air resistance during the operation of the filter device 100. This also allows the determination of a high filter occupancy of the filter medium 101 for the operating mode of the filter device 100 under low (small) volume flow, which would not lead to the triggering of the pressure difference monitoring of the filter medium 101 in the usual filter monitoring.

[0088] Figure 2 A schematic diagram of a room 200 with an exemplary embodiment of a filter device 100 according to the present invention is shown. The filter device 100, for example its housing 120, has an air outlet 107 for blowing out air 103, wherein the filter device 100 is configured such that the air outlet 107 is 1 m lower, in particular 0.5 m lower, than the ground (on which the filter device 100 is placed). Additionally or alternatively, the filter device 100 is configured such that the air outlet 107 is 1.8 m higher, in particular 2 m higher, than the head height 201 of a standing person.

[0089] The housing 120 can be arranged in a room 200 of a building and configured as, for example, a room divider. In addition, as shown, the housing 120 can have a lamp 202 and can be configured as a light source. In addition, the filter device 100 can also be installed at the wall of the room 200.

[0090] Figure 3A schematic diagram of a filter medium 101 with a corrugated filter membrane according to an exemplary embodiment is shown. The filter medium 101 has in particular a plurality of filter layers (e.g., fleece layers) 301, 302, 303, which are arranged one after the other in the flow direction of the air 101 through the filter medium 101, wherein in particular the first filter layer 301 facing the air supply side filters more coarsely than at least one second filter layer 302, 303 following the subsequent first filter layer in the flow direction. Thus, initially coarser particles are filtered, while smaller particles flow through the first layer and are only filtered out later in the fine layer.

[0091] Here, the outer filter layers are arranged as fleece layers 301, 303, and the filter layer is arranged as a filter membrane 302 between the fleece layers 301, 303. The fleece layers 301, 302, 303 are arranged one above the other in the third direction z to form a layer composite, wherein in particular the middle filter membrane 302 of the layer composite has a larger surface than the two outer fleece layers 301, 303. The middle filter membrane 302 has corrugated sections arranged one after another along the first direction x.

[0092] Figure 4 A schematic diagram of a filter medium 101 having a corrugated filter membrane 302 and corrugated cover layers as fleece layers 301 , 303 according to an exemplary embodiment is shown.

[0093] On the air supply side, a coarse covering flannel is provided as an outer flannel layer 301, which is particularly arranged in a corrugated manner on the air supply side of the filter membrane 302. The covering flannel can also be arranged as a flannel layer 303 on the exhaust side of the filter membrane 502. Here, the outer flannel layer 301 at the air supply side is more strongly corrugated than the outer flannel layer 303 at the exhaust side. Here, the filter membrane 302 is strongly corrugated and is accordingly also strongly constructed to play a filtering role. The intermediate area between the waves of the outer flannel layers 301, 303 and the filter membrane 302 can be filled with a film material to achieve higher stability.

[0094] Figure 5 A schematic diagram of a wave shape of a filter medium 101 according to an exemplary embodiment is shown. The wave segments extend irregularly and asymmetrically relative to each other in particular in a plane. The filter medium 101 is arranged such that the filter medium 101 can be overflowed with air 101 in a first direction x or in a second direction y. For example, the x direction is the air inflow direction of the air 101, and the wave segments extend in the second direction y transversely to the first direction x. The asymmetry of the wave arrangement and shape can be used for vibration damping.

[0095] Figure 6 A schematic diagram of filter media 101 having a dynamic pressure gauge 602 is shown according to an exemplary embodiment.

[0096] The dynamic pressure gauge 602 is configured so that the static pressure upstream of the filter medium 101 and the static pressure and dynamic pressure downstream of the exhaust side after the filter medium 101 can be measured. If the velocity of the air flow is high enough, the pressure difference p1-p2 between the normal pressure sampling point upstream of the filter medium 101 (pressure p1) and the dynamic pressure tube (or pitot tube) downstream of the filter medium 101 (pressure p2) can be measured. Here, the filter medium 101 is arranged in an air channel formed by a wall as an external air flow restriction 601. The pressure in the pitot tube is given by the sum of the static pressure and the dynamic pressure and is therefore higher than the pressure in the normal pressure sampling point in front of the filter medium 101. This configuration generates a reverse pressure difference or a negative pressure difference on the filter medium 101 and allows the detection of a supply line blockage or a valve flap failure.

[0097] Figure 7 A diagram showing the pressure drop of the air 103 flowing through the filter as a function of the operating time of the filter medium 101 is shown. In this diagram, the pressure drop ΔP of the air 103 flowing through the filter medium 101 increases as a function of the operating time t due to the filter occupancy. The filter medium 101 is configured (e.g., by material / pore density, material selection and / or thickness of the filter medium 101) so that the pressure drop of the air 103 flowing through the filter medium 101 (between the inlet into the filter medium 101 and the outlet from the filter medium 101) is less than 450 Pascals in a regular predetermined operating cycle defined by a predetermined operating time.

[0098] Figure 8 A schematic diagram of active noise reduction according to an exemplary embodiment is shown. The filter device 100 has a microphone unit 105 and a sound generator 106, wherein the microphone unit 105 is arranged to measure the sound level 804 of the air 103 as a noise source 803 before the fan unit 102 and / or after the filter medium 101, wherein the sound generator 106 is configured to generate a counter sound based on the measured sound level 804. Active noise suppression can thus be integrated. Here, the sound generator 106 generates a sound that can be set to be adjusted with respect to the noise source 803 generated by the air flow in a destructive interference. For this purpose, the regulator 101 (e.g., the control unit 108) is connected to the microphone unit 105 in order to generate signals for the sound generator 106. These signals can be amplified in the power amplifier 802.

[0099] In addition, it should be noted that "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. In addition, it should be noted that features or steps that have been described with reference to one of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference numerals in the claims should not be considered as limiting.

[0100] Reference Symbols List

[0101] 100 Filters

[0102] 101 Filter Media

[0103] 102 Fan Unit

[0104] 103 Air

[0105] 104 Airflow angle

[0106] 105 Microphone Unit

[0107] 106 Sound Generator

[0108] 107 Air outlet

[0109] 108 Control Unit

[0110] 109 sensor element

[0111] 110 Data storage unit

[0112] 111 Flow path of fan unit

[0113] 112 Flow channel of filter medium

[0114] 113 Weighing device

[0115] 120 Shell

[0116] Room 200

[0117] 201 Height of head of standing person

[0118] 202 Lights

[0119] 301 First flannel layer

[0120] 302 Filter membrane

[0121] 303 Second flannel layer

[0122] 601 External air flow restriction

[0123] 602 Dynamic Pressure Gauge

[0124] 801 Regulator

[0125] 802 Power Amplifier

[0126] 803 Noise Source

[0127] 804 Sound Level

[0128] x first direction

[0129] y Second direction

[0130] z The third direction

[0131] p1 Pressure on the supply side

[0132] p2 Pressure on the exhaust side

[0133] Air flow cross section of the AL fan unit

[0134] AF Filter area of ​​the filter medium

Claims

1. A filtering device (100) for filtering air (103) in a room (200) of a building, the filtering device (100) comprising: Filter medium (101), Fan unit (102), The air to be filtered (103) can be filtered by flowing through the filter medium (101) with the aid of the fan unit (102). The filter area of ​​the filter medium (101) is five times larger than the minimum air flow cross section in the fan unit (102), so that the air flow angle (104) between the flow direction of the air (103) when entering the filter medium (101) and the filter surface of the filter medium (101) is different from 90 degrees, and the volume flow rate of the air (103) driven by the fan unit (102) exceeds 50m 3 / h, the sound pressure level of the filter device (100) at a distance of one meter from the filter device (100) is lower than 48 dB, The filter medium (101) is constructed such that a pressure drop of air (103) flowing through the filter medium (101) is less than 450 Pascals.

2. The filtering device (100) according to claim 1, in, The filter area of ​​the filter medium (101) is constructed to be larger than the minimum air flow cross section in the fan unit (102), so that the sound pressure level of the filter device (100) at a distance of one meter is lower than 45 dB, in particular lower than 38 dB, in particular lower than 32 dB, and further in particular lower than 28 dB.

3. The filtering device (100) according to claim 1 or 2, in, The filter medium (101) is configured such that the pressure drop of the air (103) flowing through the filter medium (101) is lower than 250 Pa, in particular lower than 150 Pa, further in particular lower than 70 Pa or 30 Pa.

4. The filter device (100) according to any one of claims 1 to 3, in, The filter area of ​​the filter medium (101) is 10 times larger, in particular more than 20 times larger, further in particular more than 40 times larger than the smallest air flow cross section in the fan unit (102), and / or The filter medium (101) is configured to have a diameter greater than 1 m 2 , especially greater than 2m 2 , especially greater than 4m 2 , especially greater than 8m 2 The filter area (AF) 5. The filter device (100) according to any one of claims 1 to 4, in, The filter device (100) is configured so that the air volume per square meter of filter area per hour is less than 600 m 3 / (m 2 h) Especially below 140m 3 / (m 2 h) Below 85m 3 / (m 2 h) or less than 50m 3 / (m 2 h), and / or The volume flow rate of the air (103) passing through the filter device (100) is in the range of 0.1 to 5 m / s, in particular in the range of 0.2 m / s to 3.4 m / s, and further in particular in the range of 0.3 m / s to 2.8 m / s.

6. The filtering device (100) according to any one of claims 1 to 5, further comprising: a microphone unit (105), and Sound Generator (106), wherein the microphone unit (105) is arranged to measure the sound level of the air (103) before the fan unit (102) and / or after the filter medium (101), Therein, the sound generator (106) is configured to generate an anti-sound based on the measured sound level.

7. The filtering device (100) according to any one of claims 1 to 6, further comprising: an air outlet (107) for blowing out the air (103), The filter device (100) is configured such that the air outlet (107) is 1 m below the ground, in particular 0.5 m below the ground, and / or The filter device (100) is designed such that the air outlet (107) is 1.8 m higher than the ground, in particular 2 m higher.

8. The filtering device (100) according to any one of claims 1 to 7, further comprising: a control unit (108), configured to control the fan unit (102), The control unit (108) is connected to the fan unit (102) for wireless signal exchange of control commands.

9. The filtering device (100) according to claim 8, further comprising: a sensor element (109) for determining at least one air parameter of the air (103) to be filtered at the filter device (100) or an operating parameter of the filter device (100), wherein the control unit (108) is connected in particular for wireless signal exchange of sensor signals of the sensor element (109), The sensor element (109) provides the control unit (108) with data, in particular air quality-related and / or filter-related, in particular by means of RFID, NFC, Bluetooth, WLAN or a building management technology protocol, The control unit (108) is configured in particular to generate a warning signal based on filter-related data and / or to take measures related to the throughput through the filter device (100) or to a blocked or released function of the filter device (100).

10. The filter device (100) according to claim 9, in, The sensor element (109) is a dynamic pressure gauge and is in particular designed to be able to measure the static pressure upstream of the filter medium (101) and the static pressure and the dynamic pressure downstream of the filter medium (101), and / or The sensor element (109) has a microphone which is configured to detect a noise level in the room (200), so that the number and the volume of voices of people speaking in the room can be determined by measuring and evaluating the noise level in the room (200).

11. The filter device (100) according to any one of claims 8 to 10, in, The control unit (108) obtains a unique ID from the filtering device (100), wherein the unique ID contains information about a usage location of the filtering device (100), wherein the control unit (108) receives the unique ID via NFC, Bluetooth, WLAN, a proprietary protocol or a protocol of a building management system, in particular LON or EIB, Wherein, the operation and / or configuration of the filtering device (100) can be adjusted based on the unique ID.

12. The filtering device (100) according to claim 9 or 11, further comprising: a data storage unit (110) connected to the control unit (108), the fan unit (102) and the sensor element (109) to exchange data, The data can be protected in particular by means of certificates and / or encryption, The data are in particular measured values ​​selected from the group consisting of: air flow through the filter device (100), air temperature, air pressure, in particular absolute pressure and / or differential pressure, filter occupancy of the filter medium (101), air humidity, aerosol load, PM content and / or foreign matter content of the air (103), and measurement location of air measurement.

13. The filter device (100) according to any one of claims 9 to 12, in, The sensor element (109) is configured to determine the energy consumption and / or the CO2 footprint of the filter device (100) based on the air parameters and / or operating parameters of the filter device (100), in particular the filter occupancy rate and / or the operating time of the filter medium (101), In particular, air parameters and / or operating parameters of the filter device (100) are selected to determine a recommendation regarding a filter replacement and / or filter cleaning, and in particular the individual parameters are configurable.

14. The filter device (100) according to any one of claims 8 to 13, in, The control unit (108) is configured to variably control the filter device (100), in particular the fan unit (102), so that future energy availability and / or current and / or future energy consumption of the filter device (100) can be taken into account. The control unit (108) controls the filter device (100) automatically or semi-automatically based on the future energy availability of the filter device (100) and / or the building and / or the current and / or future energy consumption using an approval function.

15. The filter device (100) according to any one of claims 1 to 14, in, The filter medium (101) comprises a filter material comprising a layer of fleece, in particular a plurality of layers of fleece (301, 303). The filter medium (101) can be replaceably arranged in the filter device (100). The filter medium (101) is especially a disposable filter.

16. The filter device (100) according to claim 15, in, The filter medium (101) comprises at least two fleece layers (301, 303) and a filter membrane (302) arranged between the fleece layers (301, 303), wherein the fleece layers (301, 303) are arranged one on top of another to form a layer composite. In particular, the middle filter membrane ( 302 ) of the layer composite has a larger surface than the two outer fleece layers ( 301 , 303 ).

17. The filter device (100) according to claim 16, in, The first direction (x) and the second direction (y) define a plane, The intermediate filter membrane (302) is configured to have corrugated sections, such that the corrugated sections are arranged in sequence along a first direction (x). The corrugation segments extend irregularly and asymmetrically relative to one another, in particular in the plane, and The filter medium (101) is arranged such that the air (103) can flow through the filter medium (101) along a first direction (x) or along a second direction (y).

18. The filter device (100) according to claim 17, in, The filter medium (101) has a thickness of 2 mm to 10 mm, in particular 3 mm to 7 mm, and / or Wherein, the number of the corrugated segments is between 0.5 and 3 corrugations per centimeter.

19. The filter device (100) according to any one of claims 15 to 18, in, The surface of the filter membrane (302) is larger than the corresponding surface of the outer fleece layer (301, 303) by more than 30%, in particular by more than 80%, and further in particular by more than 200%.

20. The filtering device (100) according to any one of claims 1 to 19, further comprising: A weighing device (113) is provided to weigh the occupancy of the filter, in particular to enable compensation of distortions of the measured values ​​due to the pressure of the air (103) flowing through the system.

21. The filter device (100) according to any one of claims 1 to 20, in, The filter medium (101) comprises a filter material which is hydrophobic and / or contains natural fibers or polyolefins, in particular polypropylene, in particular the filter contains cellulose, cotton and / or hemp.

22. The filter device (100) according to any one of claims 1 to 21, in, The filter medium (101) comprises a vibroacoustic metamaterial.

23. The filtering device (100) according to any one of claims 1 to 22, further comprising: a housing (120) in which the filter medium (101) and the fan unit (102) are arranged, The housing (120) can be arranged in a room (200) of a building and is designed as a room divider, or The housing (120) has a light source and is configured as a light source, or Wherein, the housing (120) has a speaker, or The housing (120) has a sound absorbing layer and can be configured as a silencer and / or a sound absorber.

24. A method for filtering air (103) in a room (200) of a building using a filter device (100) according to any one of claims 1 to 23.

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