Air treatment system for providing treated air in a defined space, method for controlling an air treatment system, and computer program for an air treatment system

Abstract

The invention relates to an air treatment system (100) for providing treated air in a defined space (S), the air treatment system (100) comprising: a gas adsorption device (10) having a gas adsorption runner (1); a process air circuit (2) arranged to direct a process air flow through the process section (3) of the gas sorption runner (1); a regeneration air circuit (4) arranged to direct a regeneration air flow through a regeneration section (5) of the gas adsorption runner (1); and a control device (6) configured to determine that a predetermined starting criterion is satisfied; and controlling the flow of outdoor air (OA) in the cleaning mode to bypass the treatment section (3) of the gas sorption runner (1) and to pass through the regeneration section (5) of the gas sorption runner (1) before being discharged. The present disclosure also relates to a method for controlling an air treatment system (100) and a computer program for an air treatment system (100).

Description

Technical Field

[0001] The present disclosure relates to an air treatment system for providing treated air in a defined space, a method for controlling an air treatment system and a computer program for an air treatment system as defined in the preambles of the independent claims. Background Art

[0002] Various kinds of air handling systems are commonly used to provide treated air into a confined space. Such air handling systems, which include some kind of gas adsorption device with a gas adsorption element, may sometimes cause unwanted odors, such as unwanted odors caused by the accumulation of pollutants with a higher boiling point than water in the adsorption element. Odors may appear when the air handling system is started up within the same day after being shut down. Fresh air can then replace the odorous pollutants accumulated in the adsorption element, so that the odorous pollutants are introduced into the confined space together with the treated air. This may be unpleasant to people in the confined space. How the air handling system is operated can also affect the presence of odors. For example, if the regeneration / reactivation of the adsorption element is not performed regularly, or if the regeneration / reactivation of the adsorption element is performed at low temperatures, there is a greater risk of pollutants accumulating and producing odors.

[0003] The problem of odor is known and there are several different solutions to this problem. For example, carbon filters can be used to collect odorous pollutants and regular replacement of such filters can reduce the risk of odor. However, such carbon filters are not very effective in humid environments because they easily become clogged. Another solution shown in JP2005058937 A is to perform regeneration at high temperature before each start-up. This is a very effective way to remove pollutants, but it will inevitably lead to higher energy usage. Frequent replacement of adsorption elements or even gas adsorption devices can also solve the problem, but this is of course expensive and time-consuming. Another solution is to regenerate and dry the adsorption elements using outdoor / external air or indoor air before each start-up of the air treatment system. This solution is generally not very energy-efficient.

[0004] KR20180136378 A describes a system that uses a cleaning mode to purify a rotor to avoid unpleasant odors. In KR20180136378, the cleaning mode is activated based on the VOC level measured in the rotor and uses heated outdoor air. The cleaning mode can also be activated based on a timer setting. Summary of the invention

[0005] An object of the present disclosure is to mitigate, alleviate or eliminate one or more of the above noted deficiencies and disadvantages in the prior art and to solve at least the above mentioned problems.

[0006] Another object of the present disclosure is to achieve an air treatment system and a method for controlling such an air treatment system which will treat odorous pollutants in the environment of the air treatment system in an effective manner and thereby minimize the risk of unpleasant odors / odors entering a confined space.

[0007] According to a first aspect of the present disclosure, there is provided an air treatment system for providing treated air in a confined space, the system comprising: a gas adsorption device having a gas adsorption rotor; a process air circuit arranged to guide the process air flow through the process section of the gas adsorption rotor; a regeneration air circuit arranged to guide the regeneration air flow through the regeneration section of the gas adsorption rotor; and a control device configured to determine that at least one predetermined start-up criterion is met; and in a cleaning mode, control the flow of outdoor air to bypass the process section of the gas adsorption rotor and pass through the regeneration section of the gas adsorption rotor before being discharged. The control device is thus configured to start / execute the cleaning mode when at least one start-up criterion is met. At least one start-up criterion relates to at least one attribute of the outdoor air or at least one attribute of the air in the confined space.

[0008] Outdoor air may also be referred to as outside air. In the context of this document, outdoor air is intended to be air that flows into the system from an air intake located outdoors, i.e., outside the building where the air treatment is performed. In addition, outdoor air may be referred to as atmospheric air or fresh air. Outdoor air is preferably untreated air, but some filtering may be used to avoid pollutant particles from entering the air treatment system.

[0009] The property of the outdoor air may be a property or characteristic of the air, such as humidity, temperature and / or pollution level. The property of the air in the defined space (ie, indoor air) may be a pollution level such as VOC level.

[0010] By actively starting the cleaning mode, in which the outdoor air passes through the regeneration section of the gas adsorption wheel, the gas adsorption element can be cleaned in an efficient and energy-saving manner only when specific start-up criteria are met, and the risk of odor during normal operation of the air treatment system is reduced. The use of outdoor air is advantageous because the outdoor air is naturally humid, and a certain level of humidity will improve the cleaning of the gas adsorption wheel. The outdoor air will bypass the treatment section of the gas adsorption wheel in the cleaning mode, and thereby maintain the natural humidity of the outdoor air. The outdoor air will pass through the regeneration section of the gas adsorption wheel and displace the accumulated odorous pollutants, and then the air containing the odorous pollutants will be discharged / exhausted to the outside. In this way, odorous pollutants will not flow into the confined space when the air treatment system is used for normal operation.

[0011] The gas adsorption device may be a dehumidifier, such as a desiccant dehumidifier, a VOC adsorber, or a CO2 adsorber. The gas adsorption wheel may be a desiccant wheel, a rotating horizontal bed, a VOC adsorption wheel, a CO2 adsorption wheel, etc. It should be understood that although some specific components / devices / elements of the air treatment system are disclosed herein, the air treatment system may include more components / devices / elements that are considered to be well known in the technical field of the air treatment system.

[0012] In one example, the air handling system includes a first fan arranged downstream of the gas adsorption wheel in the regeneration air circuit. The first fan can be arranged to draw regeneration air through the regeneration section of the gas adsorption wheel during normal operation of the air handling system. The control device can be configured to control the first fan to draw outdoor air into the air handling system and through the regeneration section of the gas adsorption wheel in the cleaning mode.

[0013] The air treatment system may include a first damper arranged between the process air circuit and the defined space. The first damper is usually closed during the cleaning mode to ensure that no air is provided from the air treatment system to the defined space during the cleaning mode. This approach ensures that odorous pollutants are not introduced into the defined space. The air treatment system may also include a second damper arranged between the regeneration air circuit and the defined space. The second damper is usually closed during the cleaning mode to ensure that no air enters the air treatment system from the defined space during the cleaning mode and thereby has a negative impact on the regeneration of the gas adsorption wheel. Controlling the outdoor air flow to bypass the processing section of the gas adsorption wheel and pass through the regeneration section of the gas adsorption wheel may therefore include closing the first damper and / or the second damper.

[0014] In one example of the present disclosure, at least one start-up criterion includes that the humidity of the outdoor air is higher than a predetermined lower threshold level. In such an example, the start-up criterion is therefore related to humidity as at least one attribute of the outdoor air. The predetermined lower threshold level can be related to the relative humidity of the outdoor air. In this case, the predetermined lower threshold level can be 40%, preferably 50%, or more preferably 60%. Alternatively, at least one start-up criterion related to humidity is related to the absolute humidity of the outdoor air. In this case, the predetermined lower threshold level can be 3g / kg, preferably 4g / kg or more preferably 5g / kg. By ensuring that the cleaning mode is only executed when the outdoor air has a predetermined humidity, it is ensured that the gas adsorption wheel is effectively cleaned. In addition, when the outdoor air has at least a predetermined minimum humidity, the cleaning mode can be executed during a shorter period of time, which in turn leads to less downtime of the air treatment system.

[0015] As an example, at least one start-up criterion includes that the outdoor air has a temperature within a predetermined temperature range. In such an example, the start-up criterion is therefore related to the temperature as at least one attribute of the outdoor air. If the outdoor air for the cleaning mode is too cold, there is a risk that the gas adsorption wheel will freeze during the cleaning mode, which is disadvantageous. In addition, if the temperature of the outdoor air is too high, the humidity may be too low to effectively clean the gas adsorption wheel. The predetermined temperature range may be between 5 degrees Celsius and 18 degrees Celsius. Relative humidity depends on the current temperature of the air, while absolute humidity is the actual content of water vapor present in the air, regardless of temperature. Relative humidity can be described as the maximum value of the moisture contained in the measured air relative to the dry bulb temperature of the air sample. The value of relative humidity does not specify the moisture content of the air unless accompanied by the temperature of the air. Therefore, in the case where the start-up criterion includes that the outdoor air must have a relative humidity above a predetermined minimum threshold level, the start-up criterion may also include that the outdoor air has a temperature within a predetermined temperature range. If the moisture content in the air remains unchanged, the relative humidity will decrease with increasing temperature, and vice versa.

[0016] According to some examples, at least one start-up criterion includes a VOC (volatile organic compound) level measured in a defined space being higher than a predetermined VOC level and / or an odor level measured in a defined space being higher than a predetermined odor level. In such an example, the start-up criterion is therefore related to the VOC and / or odor level as at least one attribute of the air in the defined space. The air in the defined space is typically indoor air. The air handling system may therefore include a VOC and / or odor sensor arranged in the defined space and communicated with the control device. Alternatively, the control device of the air handling system may be arranged to communicate with an external VOC and / or odor sensor in the defined space. When the VOC / odor sensor records that the VOC / odor level is higher than a predetermined level, it may indicate that the cleaning mode may be beneficial to avoid further increase in the level inside the defined space. Typically, the control device of the air handling system continuously receives information (VOC / odor level) from the VOC / odor sensor and determines when the level is higher than a predetermined VOC / odor level. When the current VOC / odor level is above a predetermined VOC / odor level, the control device can start the cleaning mode the next time the air handling system is shut down. Generally, it is disadvantageous to stop normal operation of the air handling system and perform a cleaning mode when normal operation is expected. It is therefore better to wait for the next scheduled downtime and then perform the cleaning mode. The control device can additionally or alternatively be configured to perform the cleaning mode during a longer period of time of the next scheduled downtime of the air handling system after it has been determined that the VOC / odor level from the VOC / odor sensor is above a predetermined VOC / odor level. The predetermined VOC level may depend on which volatile organic compound is associated with the start criterion used to start the cleaning mode. Typically, the predetermined VOC level is set to the ppm level at which the relevant volatile organic compound typically causes odor.

[0017] According to one example, at least one start criterion additionally includes a predetermined time parameter, so that assuming that at least one previously determined start criterion has been met, the cleaning mode can be started at a predetermined time of the day and / or a certain day of the week and / or a certain month of the year. When the cleaning mode should be performed during the day may certainly affect the normal operation of the air handling system, but the time of the day can also have an impact on the outdoor air. For example, the humidity of the outdoor air is usually higher in the early morning. In addition, the outdoor air is more humid during the summer than during the winter. The time parameter can include that the cleaning mode should be started after office hours. Alternatively, the time parameter includes that the cleaning mode should be started during the night after the air handling system is normally operating, or in the early morning before the air handling system is normally operating. The time parameter can include that the cleaning mode should be performed only on certain days of the week, once a week, once a month, only during the summer months, or the like.

[0018] It should be understood that any combination of the start-up criteria mentioned herein is possible. This does not mean that all criteria must be met at the same time, but at least one of the criteria must be met in order for the control device to start the cleaning mode. As an example, the start-up criteria include that the cleaning mode should be started in the early morning of Tuesday and Thursday, or the VOC level measured in the defined space is higher than the predetermined VOC level and / or the measured odor level is higher than the predetermined odor level. Therefore, if the control device determines on Tuesday afternoon that the VOC level measured in the defined space is higher than the predetermined VOC level, the control device can be configured to perform the cleaning mode when the system is shut down on Tuesday evening or just before starting the system on Wednesday, even if the next scheduled cleaning mode should be in the early morning of Thursday according to the time parameter start-up criteria.

[0019] According to an example of the present disclosure, at least one start-up criterion includes a manual input requesting a clean mode. The air handling system may include a manipulation element, such as a button, a lever, or a switch, which indicates that the operator wants to start the clean mode when manually operated by the operator. The control device may therefore be arranged to be communicated with the manipulation element and configured to determine whether the manipulation element has been operated. Therefore, the clean mode can be started by the operator manually pressing a button or the like. Similarly, the air handling system may include a manipulation element, such as a button, a lever, or a switch, which indicates that the operator wants to terminate the clean mode when manually operated by the operator. By being able to manually enable the clean mode, the operator can determine by himself / herself whether the clean mode is needed and control the air handling system accordingly. Thus a safe, robust and flexible air handling system is achieved.

[0020] According to another example, the air handling system includes a clean duct that is fluidly connected to the regeneration air circuit upstream of the outdoor air and the gas adsorption rotor, wherein the control device is configured to control the flow of the outdoor air to enter via the clean duct. By means of an independent clean circuit, the outdoor air is communicated with the regeneration air circuit via the clean duct, and the processing section of the gas adsorption rotor is bypassed. Therefore, the outdoor air for the clean mode does not have to pass through the processing air circuit, which is the case during the normal operation of the air handling system. With a separate clean duct for the outdoor air of the clean mode, the rest of the system does not have to adapt to the clean mode function. The clean duct is only applicable to the clean mode and is not usually used during the normal operation of the air handling system. The air handling system may also include a first valve arranged in the clean duct to adjust the air flow between the clean duct and the regeneration air circuit. Therefore, the control device may be configured to control the first valve to open in the clean mode to control the flow of the outdoor air to pass through the clean duct.

[0021] According to one example, the air treatment system includes at least one circulation damper, the at least one circulation damper connecting the process air circuit and the regeneration air circuit upstream of the regeneration section of the gas adsorption rotor, wherein the control device is configured to control the flow of outdoor air from the process air circuit to the regeneration air circuit via the circulation damper. The control device can also be configured to control the first fan to draw outdoor air to the regeneration air circuit and pass through the regeneration section of the gas adsorption rotor through the process air circuit via the circulation damper. At least one circulation damper can be arranged downstream of the process section of the gas adsorption rotor. In order to bypass the process section of the gas adsorption rotor, the air treatment system may include a bypass circuit connected to the process air circuit by fluid. The bypass circuit can be arranged to allow the process air to bypass the process section of the gas adsorption rotor during normal operation of the air treatment system. This may be advantageous when the outdoor air (process air) entering the process air circuit does not have to be dried and therefore does not have to pass through the process section of the gas adsorption rotor. In order to enable the process air to bypass the process section of the gas adsorption rotor, the air treatment system may also include a second valve arranged in the bypass circuit. In the cleaning mode, the control device may be configured to control the second valve to open to allow outdoor air to bypass the treatment section of the gas adsorption wheel via the bypass duct. The control device may also be configured to control at least one circulation damper to open to allow outdoor air to flow to the regeneration air circuit and pass through the regeneration section of the gas adsorption wheel.

[0022] According to one example of the present disclosure, an air treatment system includes an evaporative humidifier arranged in a regeneration air circuit, wherein the control device is configured to control the flow of outdoor air to pass through the evaporative humidifier before passing through the regeneration section of the gas adsorption rotor. The evaporative humidifier is therefore arranged upstream of the regeneration section of the gas adsorption rotor. By allowing the outdoor air to pass through the evaporative humidifier during the cleaning mode, the air flowing through the regeneration section of the gas adsorption rotor will have a higher humidity and the cleaning will be improved. The control device can be configured to control the flow of outdoor air to pass through the humidifier during the cleaning mode when the humidity of the outdoor air is within a predetermined range. For example, at least one start-up criterion may include that the humidity of the outdoor air is higher than 40%, but if the humidity is between 40% and 55%, the control device can be configured to control the air to pass through the evaporative humidifier before passing through the regeneration section of the gas adsorption rotor. The relative humidity of the outdoor air passing through the regeneration section of the gas adsorption rotor is preferably at least 60%. Thus, if the outdoor air is below 60%, but the air handling system includes an evaporative humidifier, the cleaning mode may be initiated regardless, and the air will be controlled to flow through the humidifier first. As another example, the control may have determined that the current VOC level in the defined space is above a predetermined VOC level. In this case, the control may also be configured to control the air to flow through the humidifier the next time the cleaning mode is scheduled, even if the humidity of the outdoor air is 60%, to increase the humidity and thereby improve the cleaning of the gas adsorption wheel. The control may be configured to always or periodically control the flow of outdoor air to pass through the evaporative humidifier before passing through the regeneration section of the gas adsorption wheel, or the control may be configured to control the flow of outdoor air to pass through the evaporative humidifier before passing through the regeneration section of the gas adsorption wheel based on the humidity / temperature of the incoming outdoor air or the current VOC / odor level in the defined space. It should be understood that the evaporative humidifier may form part of the regeneration air circuit and may also be used during normal operation of the air handling system.

[0023] In the case where the air handling system includes a cleaning duct, the cleaning duct may be connected to the regeneration air circuit upstream of the evaporative humidifier. The cleaning duct may also be connected to the regeneration air circuit downstream of the evaporative humidifier. In this way, it is possible to control whether outdoor air flows through the evaporative humidifier. In the case where the cleaning mode involves outdoor air entering via the process air circuit, at least one circulation damper may be arranged to connect the process air circuit and the regeneration air circuit upstream of the evaporative humidifier. The air handling system may include: a first circulation damper, the first circulation damper connecting the process air circuit and the regeneration air circuit downstream of the evaporative humidifier; and a second circulation damper, the second circulation damper arranged to connect the process air circuit and the regeneration air circuit upstream of the evaporative humidifier. In this way, it is possible to control whether outdoor air passes through the evaporative humidifier.

[0024] According to one example, the air treatment system further comprises a heater device, wherein the control device is configured to control the flow of outdoor air to pass through the heater device before passing through the regeneration section of the gas adsorption rotor. The heater device can be arranged upstream of the evaporative humidifier. With the heater device, the air treatment system can be configured so that the outdoor air for the cleaning mode enters the regeneration air circuit upstream of the heater device. Increasing the temperature of the outdoor air can reduce the humidity, so the heater device should be arranged upstream of the evaporative humidifier. By having a heater device, the cleaning mode can also be performed when the outdoor air is too cold to pass directly through the gas adsorption rotor. The combination of the heater device and the evaporative humidifier can therefore enable the use of the cleaning mode during the winter months or when the weather conditions are too bad to use the untreated outdoor air for the cleaning mode.

[0025] According to an example of the present disclosure, the control device is configured to terminate the cleaning mode when at least one predetermined termination criterion is met, wherein at least one predetermined termination criterion includes that a predetermined time has passed after the start of the cleaning mode and / or the VOC level of the air downstream of the regeneration section of the gas adsorption rotor is lower than a predetermined termination VOC level. The control device can therefore be configured to terminate the cleaning mode after a predetermined cleaning time, for example, after 20 minutes to 60 minutes. The predetermined cleaning time is appropriately the time taken to achieve sufficient / desired cleaning of the regeneration section. The predetermined cleaning time can depend on various factors. For example, the cleaning time can depend on the air flow through the regeneration section of the gas adsorption rotor. The air flow through the regeneration section can be adjusted by controlling the first fan and / or the second fan. A higher air flow through the regeneration section can accelerate the cleaning process and the cleaning mode can be terminated after a shorter period of time. The control device can therefore be configured to control the first fan and / or the second fan to achieve the desired flow through the regeneration section during the cleaning mode, and in this way achieve the desired cleaning time. In addition, the predetermined cleaning time can depend on the humidity of the outdoor air. The humidity of the outdoor air can vary during the day, and the cleaning time can therefore be different depending on the time of day when the cleaning mode is executed. Similarly, the humidity of the outdoor air can vary according to the season, and the cleaning time can therefore be different according to the day of the year when the cleaning mode is executed. In addition, the humidity of the outdoor air can be affected by controlling the flow of the outdoor air through the evaporative humidifier. The control device can therefore be configured to control the flow of the outdoor air through the evaporative humidifier to achieve the desired humidity and in this way achieve the desired cleaning time. The predetermined cleaning time can also depend on the size / area of ​​the regeneration section, because this will affect the nominal flow through the regeneration section. In some embodiments, the gas adsorption device includes a gas adsorption rotor with a variable regeneration section. The gas adsorption rotor can therefore include a regeneration section whose size can be changed. This can be achieved by using a device that can be folded, extended or displaced to cover a larger or smaller area of ​​the gas adsorption rotor and thereby affect the area of ​​the regeneration section. By controlling the size of the regeneration section, the cleaning time can be affected. The control device can therefore be configured to control the area / region of the regeneration section to achieve a desired flow through the regeneration section during the cleaning mode and in this way achieve a desired cleaning time. The predetermined cleaning time can alternatively or additionally depend on the rotation speed of the gas adsorption wheel. The control device can therefore be configured to control the rotation speed of the gas adsorption wheel and in this way achieve a desired cleaning time.

[0026] Alternatively or additionally, the control device may be configured to terminate the cleaning mode when the air of the regeneration section of the gas adsorption rotor that has been cleaned has a sufficiently low VOC level. When the cleaning mode is started, the air of the clean regeneration section will replace a large amount of pollutants and the air downstream of the regeneration section will therefore have a relatively high level of VOC when it is discharged / exhausted to the outside. After a period of time, as the regeneration section is cleaned and the amount of pollutants in the regeneration section is reduced, the VOC level in the air downstream of the gas adsorption rotor will have a lower VOC level. Therefore, when the VOC level in the air downstream of the regeneration section of the gas adsorption rotor is lower than a predetermined termination level, the regeneration section of the gas adsorption rotor is considered to be sufficiently clean and the cleaning mode can be terminated. The predetermined termination VOC level may depend on which volatile organic compound is used as the termination criterion for ending the cleaning mode. Typically, the predetermined termination VOC level is set to a ppm level below the level at which the relevant volatile organic compound typically produces an odor.

[0027] According to a first aspect of the present disclosure, there is also provided a method for controlling an air treatment system as disclosed herein, wherein the method comprises determining that at least one predetermined start-up criterion is met; and controlling the flow of outdoor air to bypass the treatment section of the gas adsorption wheel and pass through the regeneration section of the gas adsorption wheel before being exhausted in the cleaning mode. The method thus comprises starting / performing the cleaning mode when at least one predetermined start-up criterion has been met. The method is preferably a computer-implemented method performed by means of a control device as described herein.

[0028] It should be understood that all features and advantages described with respect to the air handling system also apply to the method.

[0029] The step of controlling the flow of outdoor air through the regeneration section of the gas adsorption wheel may include controlling the flow of outdoor air to enter via a purge duct fluidly connected to the outdoor air and the regeneration air circuit upstream of the gas adsorption wheel.

[0030] According to one example, the step of controlling the flow of outdoor air through the regeneration section of the gas adsorption wheel comprises controlling the flow of outdoor air from the process air circuit to the regeneration air circuit via the circulation damper. Thus, the outdoor air enters via the process air circuit, passes via the circulation damper to the regeneration air circuit, and then passes through the regeneration section of the gas adsorption wheel.

[0031] The method may also include controlling the flow of outdoor air to pass through an evaporative humidifier arranged in the regeneration air circuit before passing through the regeneration section of the gas adsorption wheel. In this way, the humidity of the outdoor air can be increased and the cleaning of the regeneration section of the gas adsorption wheel can be improved.

[0032] The method may also include controlling the flow of outdoor air to pass through a heater device arranged in the regeneration air circuit before passing through the regeneration section of the gas adsorption wheel. In this way, the temperature of the outdoor air can be increased and the cleaning of the regeneration section of the gas adsorption wheel can be improved.

[0033] The method may also include terminating the cleaning mode when at least one predetermined termination criterion is met, wherein the at least one predetermined termination criterion includes that a predetermined cleaning time has passed after the start of the cleaning mode and / or the VOC level of the air downstream of the regeneration section of the gas adsorption wheel is lower than a predetermined termination VOC level.

[0034] According to the first aspect of the present disclosure, a computer program for an air treatment system is also provided. The air treatment system comprises: a gas adsorption device having a gas adsorption rotor; a process air circuit arranged to guide the process air flow through the process section of the gas adsorption rotor; a regeneration air circuit arranged to guide the regeneration air flow through the regeneration section of the gas adsorption rotor; and a control device, the control device comprising at least one processor, the computer program comprising computer-readable instructions, which, when executed by at least one processor, causes the air treatment system to perform the steps of the method disclosed herein.

[0035] Furthermore, according to a first aspect of the present disclosure, a computer program product is provided, the computer program product comprising at least one computer-readable medium, such as a non-transitory memory, storing the above-mentioned computer program.

[0036] The present disclosure will become apparent from the detailed description given below. The detailed description and specific examples disclose preferred embodiments of the present disclosure only by way of illustration. It will be understood by those skilled in the art from the guidance in the detailed description that changes and modifications may be made within the scope of the present disclosure.

[0037] Therefore, it should be understood that the disclosure disclosed herein is not limited to the specific component parts of the described device or the steps of the described method, because such devices and methods can change. It should also be understood that the terms used herein are only used to describe the purpose of specific embodiments, and are not intended to be limited. It should be noted that, as used in the specification and the appended claims, unless the context clearly indicates otherwise, the articles "one", "a kind of", "the" and "said" are intended to mean one or more elements in the element. In addition, the words "include", "comprise", "contain", "contain" and similar words do not exclude other elements or steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above objects as well as additional objects, features and advantages of the present disclosure will be more fully understood by referring to the following illustrative and non-limiting detailed description of example embodiments of the present disclosure when considered in conjunction with the accompanying drawings.

[0039] FIG. 1 a schematically illustrates an air handling system according to an example of the present disclosure;

[0040] FIG. 1 b schematically illustrates a control device according to an example of the present disclosure;

[0041] Figure 2 schematically illustrates an air handling system according to an example of the present disclosure;

[0042] Figure 3 schematically illustrates an air handling system according to an example of the present disclosure;

[0043] Figure 4 schematically illustrates an air handling system according to an example of the present disclosure;

[0044] Figure 5 schematically illustrates an air handling system according to an example of the present disclosure; and

[0045] Figure 6 A diagram illustrating a method for controlling an air handling system according to an example of the present disclosure is illustrated. DETAILED DESCRIPTION

[0046] The present disclosure will now be described with reference to the accompanying drawings, in which preferred example embodiments of the present disclosure are shown. However, the present disclosure may be implemented in other forms and should not be construed as being limited to the embodiments disclosed herein. The disclosed embodiments are provided to fully convey the scope of the present disclosure to the skilled person.

[0047] FIG. 1a schematically illustrates an air treatment system 100 for providing treated air in a confined space S according to an example of the present disclosure. The air treatment system 100 comprises: a gas adsorption device 10 having a gas adsorption rotor 1; a process air circuit 2 arranged to guide a process air flow through a process section 3 of the gas adsorption rotor 1; and a regeneration air circuit 4 arranged to guide a regeneration air flow through a regeneration section 5 of the gas adsorption rotor 1. During normal operation of the air treatment system 100, outdoor air OA (process air) usually enters the process air circuit and passes through the process section 3 of the gas adsorption rotor 1 in order to dry the outdoor air. The dried air is then provided to the confined space S. Indoor air from the confined space S can be used as regeneration air in the regeneration air circuit 4 for regeneration of the regeneration section 5 of the gas adsorption rotor 1. The regeneration air that has passed through the regeneration section 5 of the gas adsorption rotor 1 is then exhausted. It should be understood that the air handling system 100 may include other devices for treating the air before it is provided to the defined space S or other devices for treating the regeneration air, although these devices are not disclosed in this figure. The flow direction of the air during normal operation of the air handling system 100 is illustrated by the arrows in the loops 2, 4. This type of air handling system 100 is considered to be generally known, and we will not explain in further detail how this air handling system 100 works during normal operation.

[0048] The air treatment system 100 according to the present disclosure further includes a control device 6 configured to determine that at least one predetermined start-up criterion is satisfied, and configured to control the flow of outdoor air OA to bypass the treatment section 3 of the gas adsorption rotor 1 and pass through the regeneration section 5 of the gas adsorption rotor 1 before being discharged in the cleaning mode. Therefore, the cleaning mode includes generating a flow of outdoor air OA that bypasses the treatment section 3 of the gas adsorption rotor 1 and passes through the regeneration section 5 of the gas adsorption rotor 1 to clean the regeneration section 5. The cleaning mode is not performed during normal operation of the air treatment system 100.

[0049] FIG. 1b illustrates an exemplary embodiment of a control device 6 of an air treatment system 100 according to the present disclosure. The control device 6 may form a part of the air treatment system 100 as disclosed in FIG. 1a. The control device 6 includes at least one processor 601 and a storage medium 602. The control device 6 may be configured to perform the following when a computer program is executed by the at least one processor 601: Figure 6 The computer program includes computer readable instructions that can be stored in a storage medium 602 (such as a non-transitory hardware storage device of the control device 6).

[0050] Figure 2An air treatment system 100 for providing treated air in a confined space S according to an example of the present disclosure is schematically illustrated. The air treatment system 100 can be configured as disclosed in FIG. 1a. In this example, the air treatment system 100 includes a clean duct 7, which is fluidly connected to the outdoor air OA and fluidly connected to the regeneration air circuit 4 upstream of the gas adsorption wheel 1. The clean duct 7 may include a first end having a first opening facing the outside. The clean duct 7 may also include a second end having a second opening connected to the regeneration air circuit 4. The air treatment system 1 also includes a first valve 71 arranged in the clean duct 7 to regulate the air flow between the clean duct 7 and the regeneration air circuit 4. When the first valve 71 is open, the clean duct 7 is in fluid communication with the regeneration air circuit 4, and when the first valve 71 is closed, the clean duct 7 is not in fluid communication with the regeneration air circuit 4.

[0051] The air handling system 100 comprises a first fan 8 arranged downstream of the gas adsorption wheel 1 in the regeneration air circuit 4. The first fan 8 is arranged to draw regeneration air through the regeneration section 5 of the gas adsorption wheel 1 during normal operation of the air handling system 100.

[0052] The air treatment system 100 further comprises a first damper 21 arranged between the process air circuit 2 and the defined space S. The first damper 21 can be closed during the cleaning mode, thereby ensuring that no air is provided from the air treatment system 100 into the defined space S during the cleaning mode. The air treatment system 100 further comprises a second damper 41 arranged between the regeneration air circuit 4 and the defined space S. The second damper 41 can be closed during the cleaning mode, thereby ensuring that no air enters the air treatment system 100 from the defined space S during the cleaning mode.

[0053] The air treatment system 100 optionally includes a first filter unit 22 arranged at the inlet of the process air circuit 2. The first filter unit 22 is arranged to filter the incoming outdoor air and thereby prevent heavily polluted air from entering the gas adsorption wheel 1. A second filter unit 72 may be arranged at the inlet of the clean duct 7 to filter the outdoor air OA entering the clean duct 7.

[0054] The control device 6 is arranged in communication with the first fan 8 , the first valve 71 , the first damper 21 , and the second damper 41 .

[0055] During the cleaning mode, when at least one start-up criterion is met, the control device 6 may be configured to close the first damper 21 and / or the second damper 42. The control device 6 is configured to control the first fan 8 to draw outdoor air to pass through the regeneration section 5 of the gas adsorption rotor 1 in the cleaning mode. Typically, the control device 6 is configured to control the first fan 8 to draw outdoor air OA to the regeneration air circuit 4 and through the regeneration section 5 of the gas adsorption rotor 1 through the cleaning duct 7. Therefore, the control device 6 may be configured to control the first valve 71 to open in the cleaning mode so that the flow of outdoor air OA can pass through the cleaning duct 7 to the regeneration air circuit 4. The figure shows the air treatment system 100 in the cleaning mode, in which the first valve 71 is open and the first damper 21 and the second damper 41 are closed. The flow of outdoor air OA that cleans the regeneration section 5 of the gas adsorption rotor 1 is illustrated by arrows.

[0056] Figure 3 The air treatment system 100 for providing treated air in a defined space S according to an example of the present disclosure is schematically illustrated. The air treatment system 100 may be as shown in FIG. 1a or Figure 2 In this example, the air treatment system 100 does not include any cleaning duct 7, but includes at least one circulation damper 30, which connects the process air circuit 2 and the regeneration air circuit 4 upstream of the regeneration section 5 of the gas adsorption wheel 1. At least one circulation damper 30 is arranged downstream of the process section 3 of the gas adsorption wheel 1.

[0057] In this example, outdoor air OA for the cleaning mode enters the process air circuit 2. In order to enable the outdoor air OA to bypass the process section 3 of the gas adsorption rotor 1, the air treatment system 100 also includes a bypass circuit 23 fluidly connected to the process air circuit 2. The bypass circuit 23 is arranged to be connected to the process air circuit 2 at a first point upstream of the process section 3 of the gas adsorption rotor 1 and at a second point downstream of the process section 3 of the gas adsorption rotor 1 and upstream of at least one circulation damper 30. In order to enable the outdoor air OA to bypass the process section 3 of the gas adsorption rotor 1, the air treatment system 100 also includes a second valve 24 arranged in the bypass circuit 23 and a third valve 25 arranged in the process air circuit 2 upstream of the process section 3 of the gas adsorption rotor 1.

[0058] The air treatment system 100 comprises a second fan 26 arranged downstream of the process section 3 of the gas adsorption wheel 1 in the process air circuit 2. The second fan 26 may be arranged to draw process air through the process section 3 of the gas adsorption wheel 1 during normal operation of the air treatment system 100. Process air may also be referred to as outdoor air entering the process air circuit 2.

[0059] The control device 6 is arranged in communication with the first and second dampers 21 , 41 , the at least one circulation damper 30 , the first fan 8 , the second fan 26 and / or the second and third valves 24 , 25 .

[0060] In the cleaning mode, when at least one start criterion is met, the control device 6 is configured to control the first fan 8 to draw outdoor air through the process air circuit 2, via the circulation damper 30 to the regeneration air circuit 4 and through the regeneration section 5 of the gas adsorption wheel 1. The control device 6 is also configured to control the second valve 24 to open and the third valve 25 to close, so as to allow the outdoor air OA to bypass the process section 3 of the gas adsorption wheel 1 via the bypass duct 23. The control device 6 is also configured to control at least one circulation damper 30 to open, so as to allow the outdoor air OA to flow to the regeneration air circuit 4 and through the regeneration section 5 of the gas adsorption wheel 1. The control device 6 may also be configured to close the first damper 21 and / or the second damper 42 during the cleaning mode.

[0061] The figure shows the air treatment system 100 in a cleaning mode, in which outdoor air OA enters the process air circuit 2, bypasses (bypasses) the process section 3 of the gas adsorption wheel 1 via a bypass circuit 23, passes to the regeneration air circuit 4 via at least one circulation damper 30, and passes through the regeneration section 5 of the gas adsorption wheel 1 before being discharged. The flow of the outdoor air OA is illustrated in the figure by arrows.

[0062] Figure 4 The air treatment system 100 for providing treated air in a defined space S according to an example of the present disclosure is schematically illustrated. The air treatment system 100 may be as shown in FIG. 1a, Figure 2 or Figure 3 . In this example, the air treatment system 100 includes an evaporative humidifier 11 arranged in the regeneration air circuit 4. The evaporative humidifier 11 is arranged upstream of the regeneration section 5 of the gas adsorption wheel 1. The evaporative humidifier 11 can be used for regeneration during normal operation of the air treatment system 100, but can also be used in the cleaning mode. The control device 6 can be configured to control the flow of outdoor air OA to pass through the evaporative humidifier 11 before passing through the regeneration section 5 of the gas adsorption wheel 1.

[0063] In this example, the air treatment system 100 includes a cleaning duct 7 for use during the cleaning mode. The cleaning duct 7 is therefore connected to the regeneration air circuit 4 upstream of the evaporative humidifier 11, so that the outdoor air OA entering the cleaning duct 7 can be guided through the evaporative humidifier 11 before passing through the regeneration section 5 of the gas adsorption wheel 1. As an example, the cleaning duct 7 can also be connected to the regeneration air circuit 4 downstream of the evaporative humidifier 11 so that the outdoor air OA can not pass through the evaporative humidifier 11. In this case, the air treatment system 10 will include a first valve 71 arranged in the cleaning duct 7 and a fourth valve 74 arranged in the cleaning duct 7. When the first valve 71 is opened, the outdoor air OA will enter the regeneration air circuit 4 downstream of the evaporative humidifier 11. When the fourth valve 74 is opened, the outdoor air OA will enter the regeneration air circuit 4 upstream of the evaporative humidifier 11. By controlling the first valve 71 and the fourth valve 74, it is possible to control the outdoor air OA to flow through or not through the evaporative humidifier 11.

[0064] The air treatment system 100 may optionally include a heater device 12 arranged upstream of the evaporative humidifier 11. The clean duct 7 may therefore be connected to the regeneration air circuit 4 upstream of the heater device 12. The control device 6 may be configured to control the flow of the outdoor air OA to pass through the heater device 12 before passing through the regeneration section 5 of the gas adsorption wheel 1.

[0065] The control device 6 is thus configured to control the first fan 8 to draw outdoor air OA into the clean duct 7 and through the rest of the air treatment system 100. The control device 6 is also configured to control the first valve 71 and the fourth valve 74 to control the flow of outdoor air OA from the clean duct 7 to the regeneration air circuit 4.

[0066] The figure shows the air treatment system 100 in a cleaning mode, in which the outdoor air OA enters the cleaning duct 7, the first valve 71 is closed and the fourth valve 74 is opened, so that the outdoor air OA enters the regeneration air circuit 4 upstream of the evaporative humidifier 11. The outdoor air OA passes through the evaporative humidifier 11 before passing through the regeneration section 5 of the gas adsorption wheel 1. The flow of the outdoor air OA is illustrated in the figure by arrows.

[0067] The control device 6 can be configured to periodically control the flow of outdoor air OA through the evaporative humidifier 11 during the cleaning mode, or the control device 6 can be configured to control the flow of outdoor air OA through the evaporative humidifier 11 during the cleaning mode based on the humidity or temperature of the incoming outdoor air OA or the current VOC / odor level in the defined space S.

[0068] It should be understood that even though not shown in the figures, the air treatment system 100 may also include Figure 3 The bypass circuit 23 and the second fan 26 shown in FIG.

[0069] Figure 5 The air treatment system 100 for providing treated air in a defined space S according to an example of the present disclosure is schematically illustrated. The air treatment system 100 may be as shown in FIG. 1a, Figure 2 , Figure 3 or Figure 4 . In this example, the air treatment system 100 includes an evaporative humidifier 11 arranged in the regeneration air circuit 4. The evaporative humidifier 11 is arranged upstream of the regeneration section 5 of the gas adsorption wheel 1. The evaporative humidifier 11 can be used for regeneration during normal operation of the air treatment system 100, but can also be used in the cleaning mode. The control device 6 can therefore be configured to control the flow of outdoor air OA to pass through the evaporative humidifier 11 before passing through the regeneration section 5 of the gas adsorption wheel 1.

[0070] In this example, the air treatment system 100 is configured to use the outdoor air OA entering the process air circuit 2 during the cleaning mode. The air treatment system 100 includes at least one circulation damper 32, which is arranged to connect the process air circuit 2 and the regeneration air circuit 4 upstream of the evaporative humidifier 11. Generally, the air treatment system 100 includes: a first circulation damper 30 connecting the process air circuit 2 and the regeneration air circuit 4 downstream of the evaporative humidifier 11; and a second circulation damper 32 connecting the process air circuit 2 and the regeneration air circuit 4 upstream of the evaporative humidifier 11. By controlling the first circulation damper 30 and the second circulation damper 32, it is possible to control whether the outdoor air OA passes through the evaporative humidifier 11.

[0071] The air treatment system 100 may optionally include a heater device 12 arranged upstream of the evaporative humidifier 11. The second circulation damper 32 may therefore be arranged to connect the process air circuit 2 and the regeneration air circuit 4 upstream of the heater device 12. The control device 6 may be configured to control the flow of the outdoor air OA to pass through the heater device 12 before passing through the regeneration section 5 of the gas adsorption wheel 1.

[0072] In the cleaning mode, the control device 6 is configured to control the first fan 8 to draw the outdoor air OA into the process air circuit 2 and through the rest of the air treatment system 100. The control device 6 is also configured to control the second valve 24 to open and the third valve 25 to close to allow the outdoor air OA to bypass the process section 3 of the gas adsorption wheel 1 via the bypass duct 23. The control device 6 is also configured to control the first circulation damper 30 and the second circulation damper 32 to control the flow of the outdoor air OA from the process air circuit 2 to the regeneration air circuit 4. The control device 6 may also be configured to close the first damper 21 and / or the second damper 42 during the cleaning mode.

[0073] The figure shows the air treatment system 100 in a cleaning mode in which the outdoor air OA enters the process air circuit 2, the third valve 25 is closed and the second valve 24 is open to bypass the process section 3 of the gas adsorption wheel 1. The first circulation damper 30 is closed and the second circulation damper 32 is open, so that the outdoor air OA enters the regeneration air circuit 4 upstream of the evaporative humidifier 11. The outdoor air OA thus passes through the evaporative humidifier 11 before cleaning the regeneration section 5 of the gas adsorption wheel 1. The flow of the outdoor air OA is illustrated in the figure by arrows.

[0074] The control device 6 can be configured to periodically control the flow of outdoor air OA through the evaporative humidifier 11 during the cleaning mode, or the control device 6 can be configured to control the flow of outdoor air OA through the evaporative humidifier 11 during the cleaning mode based on the humidity or temperature of the incoming outdoor air OA or the current VOC / odor level in the defined space S.

[0075] Figure 6 FIG. 1 shows a method for controlling an air treatment system 100 according to an example of the present disclosure. The air treatment system 100 may be as shown in FIG. 1a, Figure 3 , Figure 4 or Figure 5 The method comprises the following steps: determining s101 that at least one predetermined start-up criterion is satisfied; and controlling s102 the flow of outdoor air OA in the cleaning mode to bypass the treatment section 3 of the gas adsorption wheel 1 and pass through the regeneration section 5 of the gas adsorption wheel 1 before being discharged. The method is preferably a computer-implemented method executed by means of a control device 6 as described herein.

[0076] At least one start-up criterion may include that the humidity of the outdoor air OA is higher than a predetermined lower threshold level. The predetermined lower threshold level may be 40%, preferably 50%, or more preferably 60%. At least one start-up criterion may alternatively or additionally include that the outdoor air OA has a temperature within a predetermined temperature range. The predetermined temperature range may be between 5 degrees Celsius and 18 degrees Celsius. Alternatively or additionally, at least one start-up criterion includes that the VOC (Volatile Organic Compound) level measured in the defined space S is higher than a predetermined VOC level and / or the odor level measured in the defined space S is higher than a predetermined odor level. At least one start-up criterion may include a predetermined time parameter so that the cleaning mode is started at a predetermined time of the day and / or a certain day of the week and / or a certain month of the year. The time parameter may include that the cleaning mode should be started after office hours. Alternatively, the time parameter includes that the cleaning mode should be started during the night after normal operation of the air treatment system 100, or started in the early morning before normal operation of the air treatment system 100. The time parameters may include that the cleaning mode should be performed only on certain days of the week, once a week, once a month, only during summer months or the like. According to another example, at least one start criterion includes a manual input requesting the cleaning mode.

[0077] It should be understood that any combination of the start criteria mentioned herein is possible. This does not mean that all criteria must be met at the same time, but at least one of the criteria must be met in order for the control device to start the cleaning mode.

[0078] The step of controlling s102 the flow of outdoor air OA through the regeneration section 5 of the gas adsorption wheel 1 may include controlling the first fan 8 in the regeneration air circuit 4 to draw the outdoor air OA into the air handling system 100 for the cleaning mode.

[0079] The step of controlling s102 the flow of outdoor air OA through the regeneration section 5 of the gas adsorption wheel 1 may include controlling the first damper 21 to close the communication between the air treatment circuit 2 and the confined space S. The step may also include controlling the second damper 41 to close the communication between the regeneration air circuit 4 and the confined space S.

[0080] The step of controlling s102 the flow of outdoor air OA through the regeneration section 5 of the gas adsorption rotor 1 may include controlling the flow of outdoor air OA to enter via a clean duct 7, which is fluidly connected to the outdoor air OA and fluidly connected to the regeneration air circuit 4 upstream of the gas adsorption rotor 1. Controlling the flow of outdoor air OA to enter via the clean duct 7 may include controlling the first valve 71 to open the communication between the clean duct 7 and the regeneration air circuit 4.

[0081] The step of controlling s102 the flow of outdoor air OA through the regeneration section 5 of the gas adsorption wheel 1 may alternatively include controlling the flow of outdoor air OA from the process air circuit 2 to pass through the circulation dampers 30, 32 to the regeneration air circuit 4. The outdoor air OA thus enters through the process air circuit 2, passes through the circulation dampers 30, 32 to the regeneration air circuit 4, and then passes through the regeneration section 5 of the gas adsorption wheel 1. This may include controlling at least one circulation damper 30, 32 to open the communication between the process air circuit 2 and the regeneration air circuit 4. It may also include controlling the second valve 24 in the bypass circuit 23 to open so that the outdoor air OA can bypass the process section 3 of the gas adsorption wheel 1.

[0082] The method may further include the following steps: controlling s103 the flow of outdoor air OA to pass through the evaporative humidifier 11 arranged in the regeneration air circuit 4 before passing through the regeneration section 5 of the gas adsorption wheel 1. In the case where the air treatment system 100 includes a cleaning duct 7, this may include controlling the first valve 71 to be closed and controlling the fourth valve 74 in the cleaning duct 7 to be opened so that the outdoor air OA enters the regeneration air circuit 4 upstream of the evaporative humidifier 11. In the case where the outdoor air OA for the cleaning mode enters the process air circuit 2, the method steps may include controlling the first circulation damper 30 to be closed and controlling the second circulation damper to be opened so that the outdoor air OA enters the regeneration air circuit 4 upstream of the evaporative humidifier 11.

[0083] The method may further comprise the step of controlling s104 the flow of the outdoor air OA to pass through a heater device 12 arranged in the regeneration air circuit 4 before passing through the regeneration section 5 of the gas adsorption wheel 1 .

[0084] The method may further include the following steps: terminating s105 the cleaning mode when at least one predetermined termination criterion is met, wherein at least one predetermined termination criterion includes that a predetermined time has passed after the start of the cleaning mode and / or the VOC level of the air downstream of the regeneration section 5 of the gas adsorption wheel 1 is lower than a predetermined termination VOC level.

[0085] Those skilled in the art recognize that the present disclosure is not limited to the preferred embodiments described above. Those skilled in the art also recognize that various modifications and variations are possible within the scope of the appended claims. Additionally, based on a study of the drawings, the disclosure, and the appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments when practicing the claimed disclosure.

Claims

1. An air treatment system (100) for providing treated air in a confined space (S), the air treatment system (100) comprising: - a gas adsorption device (10), the gas adsorption device (10) comprising a gas adsorption rotor (1); - a process air circuit (2) arranged to direct a process air flow through a process section (3) of the gas adsorption wheel (1); and - a regeneration air circuit (4) arranged to direct a regeneration air flow through a regeneration section (5) of the gas adsorption wheel (1); as well as - a control device (6) configured to determine that at least one predetermined start-up criterion is met and to control the flow of outdoor air (OA) to bypass the treatment section (3) of the gas adsorption wheel (1) and pass through the regeneration section (5) of the gas adsorption wheel (1) before being discharged in a cleaning mode, Therein, the at least one activation criterion relates to at least one property of the outdoor air or at least one property of the air in the confined space (S).

2. The air treatment system (100) according to claim 1, wherein: The at least one activation criterion includes a humidity of the outdoor air (OA) being above a predetermined lower threshold level.

3. The air treatment system (100) according to claim 1 or 2, wherein: The at least one start-up criterion includes the outdoor air (OA) having a temperature within a predetermined temperature range.

4. The air treatment system (100) according to any one of claims 1 to 3, wherein: The at least one activation criterion comprises a VOC level measured in the confined space (S) being above a predetermined VOC level.

5. The air treatment system (100) according to any one of claims 1 to 4, wherein: The at least one activation criterion further comprises a predetermined time parameter, such that the cleaning mode is activated at a predetermined time of day, day of the week and / or month of the year.

6. The air treatment system (100) according to any one of claims 1 to 5, wherein: The air handling system (100) comprises a clean duct (7) which is fluidically connected to the outdoor air (OA) and the regeneration air circuit (4) upstream of the gas adsorption wheel (1), wherein the control device (6) is configured to control the flow of the outdoor air (OA) entering through the clean duct (7).

7. The air treatment system (100) according to any one of claims 1 to 5, wherein: The air treatment system (100) comprises at least one circulation damper (30, 32), wherein the circulation damper (30, 32) connects the process air circuit (2) and the regeneration air circuit (4) upstream of the gas adsorption wheel (1), wherein the control device (6) is configured to control the flow of the outdoor air (OA) from the process air circuit (2) through the circulation damper (30, 32) to the regeneration air circuit (4).

8. The air treatment system (100) according to any one of claims 1 to 7, wherein: The air treatment system (100) comprises an evaporative humidifier (11) arranged in the regeneration air circuit (4), wherein the control device (6) is configured to control the flow of the outdoor air (OA) to pass through the evaporative humidifier (11) before passing through the regeneration section (5) of the gas adsorption wheel (1).

9. The air treatment system (100) according to any one of claims 1 to 8, wherein: The air treatment system (100) further comprises a heater device (12) arranged in the regeneration air circuit (4), wherein the control device (6) is configured to control the flow of the outdoor air (OA) to pass through the heater device (12) before passing through the regeneration section (5) of the gas adsorption wheel (1).

10. The air treatment system (100) according to any one of claims 1 to 9, wherein the control device (6) is configured to terminate the cleaning mode when at least one predetermined termination criterion is met, wherein: The at least one predetermined termination criterion comprises that a predetermined time has elapsed after the start of the cleaning mode and / or the VOC level of the air downstream of the regeneration section (5) of the gas adsorption wheel (1) is below a predetermined termination VOC level.

11. A method for controlling an air treatment system (100) according to any one of claims 1 to 10, wherein: The method comprises: - determining (s101) that at least one predetermined start-up criterion is met; and - In cleaning mode, controlling (s102) the flow of outdoor air (OA) to bypass the treatment section (3) of the gas adsorption wheel (1) and pass through the regeneration section (5) of the gas adsorption wheel (1) before being discharged.

12. The method according to claim 11, wherein: The step of controlling (s102) the flow of the outdoor air (OA) through the regeneration section (5) of the gas adsorption wheel (1) includes controlling the flow of the outdoor air (OA) to enter through the cleaning duct (7), and the cleaning duct (7) is fluidically connected to the outdoor air (OA) and the regeneration air circuit (4) upstream of the gas adsorption wheel (1).

13. The method according to claim 11, wherein: The step of controlling (s102) the flow of the outdoor air (OA) through the regeneration section (5) of the gas adsorption wheel (1) comprises controlling the flow of the outdoor air (OA) from the process air circuit (2) to the regeneration air circuit (4) via the circulation damper (30, 32).

14. The method according to any one of the preceding claims 11 to 13, wherein: The method further comprises: - Controlling (s103) the flow of the outdoor air (OA) to pass through an evaporative humidifier (11) in the regeneration air circuit (4) before passing through the regeneration section (5) of the gas adsorption wheel (1).

15. A computer program for an air treatment system (100), the air treatment system (100) comprising: A gas adsorption device (10), the gas adsorption device (10) having a gas adsorption rotor (1); a process air circuit (2), the process air circuit (2) being arranged to guide the process air flow through the process section (3) of the gas adsorption rotor (1); a regeneration air circuit (4), the regeneration air circuit (4) being arranged to guide the regeneration air flow through the regeneration section (5) of the gas adsorption rotor (1); and a control device (6), the control device (6) comprising at least one processor (601), the computer program comprising computer-readable instructions, which, when executed by the at least one processor (601), causes the air treatment system (100) to perform the steps of the method of any one of claims 11 to 14.

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