System and method for controlling humidity in defined space

Abstract

The present disclosure relates to a system (1) for controlling humidity in a defined space (2), the system (1) comprising: an active air conditioner (4) fluidly connected to the defined space (2); a control device (100) operatively coupled to the active air conditioner (4); at least one hygrometer (6, 14) arranged in the defined space (2) and operatively coupled to the control device (100); a passive dehumidifier and humidifier (8) comprising a hygroscopic material (10), the passive dehumidifier and humidifier (8) being configured to be housed in the defined space (2) and to be in contact with air in the defined space (2). The control device (100) is configured to control the active air conditioner (4) based on information from the first hygrometer (6) to condition the air in the defined space (2) to a dew point target value (CDPt), and the passive dehumidifier and humidifier (8) is configured to suppress fluctuations with respect to the dew point target value (CDPt). The present disclosure also relates to a method for controlling the humidity in a defined space (2) using the system (1).

Description

Technical Field

[0001] The present invention relates to a system for controlling humidity in a defined space and a method for controlling humidity in a defined space using the system. More specifically, the present invention relates to a system for controlling humidity in a defined space, the system comprising: an active air conditioner, the active air conditioner being fluidically connected to the defined space; a control device, the control device being operatively connected to the active air conditioner; at least one hygrometer, the at least one hygrometer being arranged in the defined space and being operatively connected to the control device; a passive dehumidifier and a humidifier, the passive dehumidifier and the humidifier comprising hygroscopic materials, the passive dehumidifier and the humidifier being configured to be accommodated in the defined space and in contact with the air in the defined space. The present invention also relates to a method for controlling humidity in a defined space using such a system. Background Art

[0002] Dehumidifiers, such as adsorption dehumidifiers and condensation dehumidifiers, are used to separate and remove moisture from the air. Adsorption dehumidifiers typically include a dehumidifying element in the form of a wheel or rotor that holds a desiccant material that effectively absorbs and retains water vapor. The desiccant rotor can be divided into two sections: a processing section and a regeneration section. The air flow to be dehumidified, i.e., the process air, will pass through the processing section of the desiccant rotor, and the desiccant material in the rotor extracts moisture from the process air so that the process air can leave the rotor as dry air. At the same time, the desiccant material is regenerated by another air flow flowing through the regeneration section, and the desiccant rotor can always rotate slowly around the longitudinal axis of the desiccant rotor. By means of simultaneously dehumidifying the process air and regenerating the desiccant material, the dehumidifier can operate continuously. US2007056307 discloses an example of a dehumidifier with a desiccant wheel.

[0003] Document US20200408425 A1 discloses a device suitable for controlling the temperature and air humidity in a room. The device includes an element having a certain amount of hygroscopic material and a device for passing air through or through the element. A fan provides forced convection of air above the hygroscopic material in the element or in a desired path through the hygroscopic material in the element. The system can stabilize changes in temperature and humidity by cyclic absorption and evaporation that matches changes in external humidity.

[0004] If all or most of the moisture in the air is removed, very dry air or ultra dry air can be obtained. This dry air can be delivered to a dry space or dry room where activities such as manufacturing processes that have a great demand for dry air in the surrounding space are carried out. Summary of the invention

[0005] Known devices - comprising elements or panels of hygroscopic material suitable for controlling the temperature and humidity of the air - use active air flow generating means, such as fans or blowers, for generating air flow at the hygroscopic element. External devices can be used in combination with the hygroscopic element as a supplement to minimize energy consumption or energy costs.

[0006] Active air conditioners, such as adsorption dehumidifiers and condensation dehumidifiers, can be effectively used to separate and remove moisture from the air, and can also produce very dry air or ultra-dry air in a dry space or dry room. However, there is also a great demand for very low humidity fluctuations in such a dry space or dry room. Depending on the characteristics of the active air conditioner and the conditions of the dry space or dry room, the active air conditioner itself may have difficulty in suppressing humidity fluctuations. In addition, the active air conditioner itself may have difficulty in keeping the humidity in the dry space or dry room at a constant level.

[0007]

[0006] Despite the known solutions in the art, it would be desirable to develop systems and methods for controlling humidity that overcome or mitigate at least some of the shortcomings of the prior art.

[0008] An object of the present disclosure is to mitigate, alleviate or eliminate one or more of the above-mentioned deficiencies and disadvantages in the prior art and to at least solve the above-mentioned problems.

[0009] Another object of the invention is to achieve a system and a method for controlling humidity which allow stable, reliable and efficient treatment of the air and thus improve the functionality / performance of the drying space or drying room.

[0010] Another object of the invention is to achieve a system and a method for controlling humidity which suppress humidity fluctuations in a drying space or drying room.

[0011] These objects are achieved by the initially defined system, which also includes the following features: the control device is configured to control the active air conditioner based on information from at least one hygrometer to dehumidify the air in the defined space to a dew point target value, and the passive dehumidifier and humidifier are configured to suppress fluctuations relative to the dew point target value. These objects are also achieved by a method for controlling the humidity in a defined space using such a system.

[0012] An advantage is that the system allows for a stable, reliable and efficient treatment of the air and thereby improves the functionality / performance of the drying space or drying room.Another advantage is that the system can suppress humidity fluctuations in the drying space or drying room.

[0013] The defined space may be a dry space or a dry room where the relative humidity and the dew point value in degrees Celsius are very low. Work requiring the absence of moisture and where the humidity fluctuation must be very low may be performed in the dry space or dry room. The system may produce very dry air or ultra-dry air in the defined space. The active air conditioner may include an active dehumidifier, an active humidifier, an active air heater, and an active air cooler. The active air conditioner may be driven by electricity or any other power source. The active air conditioner may actively dehumidify the air in the defined space. The defined space may be a room where the dew point and temperature must be kept in a narrow range so that a combination of dehumidification, humidification, heating, and cooling may be required. The active air conditioner may include an adsorption dehumidifier or a condensing dehumidifier. The control device is configured to control the active air conditioner to dehumidify, humidify, heat, and cool the air in the defined space. This has the advantage that the control of the humidity and temperature in the defined space may be automatically performed using the system. The at least one hygrometer may be arranged at any position in the defined space. The at least one hygrometer may be arranged at a location in the defined space where the requirements for low Celsius dew point values ​​and low humidity fluctuations are high. The hygrometer may be a dew point sensor. The dew point sensor may be a cooling optical device that detects when dew or frost is formed on a surface, such as a mirror surface in contact with the air. Passive dehumidifiers and humidifiers may be arranged on a wall, ceiling, floor or furniture in the defined space. In addition, passive dehumidifiers and humidifiers may be arranged as independent screens in the defined space. The hygroscopic materials in the passive dehumidifiers and humidifiers are configured to dehumidify and humidify the defined space. The moisture in the hygroscopic materials in the passive dehumidifiers and humidifiers may be released to the defined space. The moisture in the defined space may be absorbed by the hygroscopic materials in the passive dehumidifiers and humidifiers. The dew point target value may be set according to the requirements for the defined space. If the defined space is a dry space or a dry room, the dew point target value may be very low. In addition, according to the requirements for the defined space, the acceptable fluctuation relative to the dew point target value may be low.

[0014] The dew point target value may be in the range of -100 CDP to +12 CDP (Celsius dew point). In a defined space, a dew point target value in this range may meet the requirements of a dry space or dry room. A dry space or dry room with a dew point value of -100 CDP may include ultra-dry air. A dew point target value in the range of -100 CDP to +12 CDP may result in work that requires the absence of moisture and where humidity fluctuations must be very low.

[0015] Passive dehumidifiers and humidifiers can be configured to suppress fluctuations within a range of 0.1CDP-2CDP relative to a dew point target value. Fluctuations within a range of 0.1CDP-2CDP relative to a dew point target value can result in a stable dew point value within a defined space. Such low fluctuations relative to a dew point target value can result in jobs requiring low humidity fluctuations being performed.

[0016] The system may include an auxiliary air conditioning device that is fluidly connected to the defined space and operatively coupled to the control device. The auxiliary air conditioning device may condition the air in the defined space. Alternatively or in combination, the auxiliary air conditioning device may condition ambient air from outside the defined space and discharge the conditioned air into the defined space.

[0017] The auxiliary air conditioning device may be configured to adjust the temperature in the defined space. A requirement for a temperature set point value may be set. The auxiliary air conditioning device may be configured to increase or decrease the temperature in the defined space so that the temperature reaches the temperature set point value and remains at the temperature set point value.

[0018] The first hygrometer can be arranged in the defined space, and the second hygrometer can be arranged at the passive dehumidifier and humidifier, wherein the first hygrometer and the second hygrometer are operatively connected to the control device, and wherein the control device is configured to control the active air conditioner based on information from the first hygrometer and the second hygrometer. The first hygrometer can be arranged at a location in the defined space where the requirements for low Celsius dew point values ​​and low humidity fluctuations are high. Such a location in the defined space can be a location where work with high requirements for low humidity and constant levels of humidity is performed. The second hygrometer can be arranged at the passive dehumidifier and humidifier. The second hygrometer can be arranged near the passive dehumidifier and humidifier, i.e., at the passive dehumidifier and humidifier. The first hygrometer and the second hygrometer can be arranged as a first dew point sensor and a second dew point sensor.

[0019] The passive dehumidifier and humidifier may include a housing for accommodating hygroscopic materials, wherein the housing may include at least one perforated wall. The housing may facilitate the arrangement and installation of the passive dehumidifier and humidifier on a wall, ceiling, floor or furniture in a defined space. The housing may protect the passive dehumidifier and humidifier from external physical influences. The passive dehumidifier and humidifier may release moisture to the defined space and absorb moisture from the defined space through at least one perforated wall of the housing. The second hygrometer may be arranged at or on at least one perforated wall of the housing. In addition, the second hygrometer may be arranged on the inside or outside of at least one perforated wall of the housing.

[0020] The hygroscopic material of the passive dehumidifier and humidifier may include a structured medium having a corrugated structure or a honeycomb structure. The corrugated structure or the honeycomb structure of the structured medium of the hygroscopic material of the passive dehumidifier and humidifier may increase the exposed surface of the structured medium. The large exposed surface of the structured medium may increase the absorption capacity of the hygroscopic material of the passive dehumidifier and humidifier.

[0021] The method according to the present disclosure includes the following steps: determining a dew point value in degrees Celsius in a defined space by means of at least one hygrometer; controlling an active air conditioner based on the determined dew point value in degrees Celsius to adjust the air in the defined space to a dew point target value; and suppressing any fluctuations in the dew point target value by means of a passive dehumidifier and a humidifier.

[0022] An advantage is that the method allows a stable, reliable and efficient treatment of the air and thereby improves the functionality / performance of the drying space or drying room.Another advantage of the method is that humidity fluctuations in the drying space or drying room can be suppressed.

[0023] The dew point target value may be set according to the requirements of the defined space. If the defined space is a dry space or a dry room, the dew point target value may be very low. The step of determining the Celsius dew point value in the defined space by means of at least one hygrometer may be determined at a location in the defined space where the requirements for low Celsius dew point values ​​are high. The determined Celsius dew point value may be transmitted to the control device. If the determined Celsius dew point value is higher than the dew point target value, the air in the defined space should be dehumidified. If the determined Celsius dew point value is higher or lower than the dew point target value, the control device may perform a step of controlling an active air conditioner based on the determined Celsius dew point value to adjust the air in the defined space to the dew point target value. When the dew point target value is reached, it may be difficult for the active air conditioner to keep the Celsius dew point value at the dew point target value. Therefore, the step of suppressing any fluctuations about the dew point target value by means of a passive dehumidifier and a humidifier may keep the Celsius dew point value at the dew point target value. The step of controlling the active air conditioner to condition the air in the defined space to the dew point target value based on the determined Celsius dew point value includes dehumidifying or humidifying the air in the defined space to the dew point target value.

[0024] The at least one hygrometer may include a first hygrometer arranged in the defined space and a second hygrometer arranged at the passive dehumidifier and humidifier, wherein the method may include the following further steps: determining a Celsius dew point value at the hygroscopic material of the passive dehumidifier and humidifier by means of the second hygrometer; and controlling the active air conditioner based on the Celsius dew point value determined at the passive dehumidifier and humidifier. The information of the Celsius dew point value in the hygroscopic material of the passive dehumidifier and humidifier can determine how the activity of the active air conditioner should be adjusted. If the Celsius dew point value in the hygroscopic material of the passive dehumidifier and humidifier is high, moisture may be released into the defined space. Therefore, it can be determined that the active air conditioner should be adjusted or activated to reduce or increase the Celsius dew point value in the hygroscopic material of the passive dehumidifier and humidifier. Therefore, the information of the Celsius dew point value in the hygroscopic material of the passive dehumidifier and humidifier can facilitate the ability to quickly reach the dew point target value and maintain the Celsius dew point value at the dew point target value.

[0025] The method may comprise the further step of controlling the auxiliary air conditioning device to adjust the temperature in the defined space. Since the temperature in the defined space may affect the relative humidity value, the control device may control the auxiliary air conditioning device to adjust the temperature in the defined space. A temperature sensor arranged in the defined space and connected to the control device may form the basis for activating the auxiliary air conditioning device at a certain level.

[0026] Dew point can be measured near or next to the hygroscopic material of passive dehumidifiers and humidifiers, that is, at the hygroscopic material of passive dehumidifiers and humidifiers. Unless the system has reached equilibrium, the hygroscopic material itself has different humidity at different depths. The hygroscopic material can carry much more moisture than the surrounding air. The hygroscopic material should act very quickly. When the door to the dry space or dry room is opened, the moisture in the hygroscopic material increases so that only a small portion of the dry space remains near the target dew point. The active air conditioner is then adjusted or activated to achieve the target dew point value of degrees Celsius. Because the hygroscopic material now carries more moisture than it could carry at the target air dew point, the hygroscopic material must slowly release moisture back into the room. The active air conditioner reduces this moisture until the system eventually returns to equilibrium humidity.

[0027] According to an example, the Celsius dew point value in the defined space and the Celsius dew point value at the passive dehumidifier and humidifier are all at the dew point target value under the equilibrium humidity. When the humidity in the defined space suddenly increases, it is due to the door or window leading to the defined space being opened. The first hygrometer detects, senses and determines the increased Celsius dew point value in the defined space. The control device receives information about the determined Celsius dew point value. The control device controls the active air conditioner based on the determined Celsius dew point value to dehumidify the air in the defined space to the dew point target value. Due to the increase in the Celsius dew point value in the defined space, the Celsius dew point value at the hygroscopic material of the passive dehumidifier and humidifier also increases. The ability of the passive dehumidifier and humidifier to absorb moisture in the air in the defined space will reduce the Celsius dew point value in the defined space together with the active air conditioner. As the active air conditioner continues to reduce the Celsius dew point value in the defined space, the Celsius dew point value at the hygroscopic material of the passive dehumidifier and humidifier also decreases. The second hygrometer detects, senses and determines the Celsius dew point value at the passive dehumidifier and the humidifier. The control device receives information about the determined Celsius dew point value. The control device controls the active air conditioner based on the determined Celsius dew point value. Finally, the Celsius dew point value in the defined space will reach the dew point target value. However, it may be difficult for the active air conditioner to keep the humidity in the dry space or dry room at a constant level. Once the humidity in the dry space or dry room reaches the dew point target value, the passive dehumidifier and humidifier suppress fluctuations in the defined space relative to the dew point target value. During the suppression of humidity fluctuations in the defined space, the temperature in the defined space can also be controlled via the auxiliary air conditioning device by detecting the temperature in the defined space.

[0028] The effects and features of the second aspect are largely similar to those described above in conjunction with the first aspect. The embodiments mentioned in relation to the first aspect are substantially compatible with the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above objects and other 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 taken in conjunction with the accompanying drawings.

[0030] Figure 1 schematically illustrates a drying space or drying room including a system for controlling humidity according to an example;

[0031] Figure 2 A passive dehumidifier and a humidifier according to an example are schematically illustrated in perspective view;

[0032] Figure 3 A flowchart showing a method according to an example; and

[0033] Figure 4 A control device or a computer according to an example is schematically illustrated. DETAILED DESCRIPTION

[0034] 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.

[0035] Figure 1 A defined space 2, such as a drying space or drying room, is schematically illustrated, which includes a system 1 for controlling humidity and / or temperature in the defined space 2. The system 1 includes an active air conditioner 4 fluidly connected to the defined space 2. The active air conditioner 4 may include an active dehumidifier, an active humidifier, an active air heater and / or an active air cooler. A control device 100 is operatively coupled to the active air conditioner 4. According to Figure 1 In the example in FIG. 2 , the active air conditioner 4 includes an adsorption dehumidifier including a desiccant rotor 20. The air flow F1 to be dehumidified, i.e., the process air, will pass through the process section of the desiccant rotor 20, and the desiccant material in the rotor 20 extracts moisture from the process air so that the process air can leave the rotor 2 as dry air F2. At the same time, the desiccant material in the rotor 20 is regenerated by another air flow, which flows through the regeneration section of the rotor 20 and leaves the confined space 2 as a regenerated air flow F3. As described above, the active air conditioner 4 may also include an active humidifier for humidifying the air. The passive dehumidifier and humidifier 8 include a hygroscopic material 10, which is configured to be accommodated in the confined space 2 and in contact with the air in the confined space 2. The passive dehumidifier and humidifier 8 are configured to dehumidify and humidify the air in the confined space 2, which is caused by Figure 1 Indicated by the double arrow 26 in FIG.

[0036] A first hygrometer 6 is arranged in the defined space 2, and a second hygrometer 14 is arranged at the passive dehumidifier and humidifier 8. The first hygrometer 6 and the second hygrometer 14 are operatively connected to the control device 100. The control device 100 is configured to control the active air conditioner 4 based on information from the first hygrometer 6 and the second hygrometer 14.

[0037] The control device 100 is configured to control the active air conditioner 4 based on the information from the first hygrometer 6 to dehumidify the air in the defined space 2 to the dew point target value CDPt. The dew point target value CDPt may be in the range of -100CDP to +12CDP. The passive dehumidifier and humidifier 8 are configured to suppress fluctuations relative to the dew point target value CDPt, which may be in the range of 0.1CDP-2CDP relative to the dew point target value CDPt.

[0038] The system 1 includes an auxiliary air conditioning device 12, which is fluidly connected to the defined space 2 and operatively coupled to the control device 100. The auxiliary air conditioning device 12 is configured to adjust the temperature T in the defined space 2. Ambient air A1 can be configured to flow into an inlet 28 of the auxiliary air conditioning device 12 and enter the defined space 2 as conditioned air A2 from an outlet 30 of the auxiliary air conditioning device 12. A temperature sensor 22 is arranged in the defined space 2 and is connected to the control device 100. The defined space 2 may include an opening 24, such as a door and / or a window.

[0039] Figure 2 A passive dehumidifier and humidifier 8 according to an example is schematically illustrated in a perspective view. The passive dehumidifier and humidifier 8 comprises a housing 16 containing a hygroscopic material 10. The housing 16 comprises at least one air-permeable wall, such as a perforated wall 18. The hygroscopic material 10 of the passive dehumidifier and humidifier 8 comprises a structured medium having a corrugated structure or a honeycomb structure.

[0040] Figure 3 Shown for use Figure 1Flow chart of a method for controlling humidity in a confined space 2 by using a system 1 disclosed in . The method comprises the following steps: determining s101 a Celsius dew point value CDPs in the confined space 2 by means of at least one hygrometer 6; controlling s102 an active air conditioner 4 based on the determined Celsius dew point value CDPs to adjust the air in the confined space 2 to a dew point target value CDPt; and suppressing s103 fluctuations relative to the dew point target value CDPt by means of a passive dehumidifier and a humidifier 8. The step of controlling s102 an active air conditioner 4 based on the determined Celsius dew point value CDPs to adjust the air in the confined space 2 to a dew point target value CDPt comprises dehumidifying or humidifying the air in the confined space 2 to the dew point target value CDPt. The at least one hygrometer 6, 14 comprises a first hygrometer 6 arranged in the defined space 2 and a second hygrometer 14 arranged at the passive dehumidifier and humidifier 8, wherein the method comprises the further steps of determining s104 a dew point value CDPp in degrees Celsius at the hygroscopic material 10 of the passive dehumidifier and humidifier 8 by means of the second hygrometer 14; and controlling s105 the active air conditioner 4 based on the determined dew point value CDPp in degrees Celsius at the passive dehumidifier and humidifier 8. Furthermore, the method comprises the step of controlling s106 the auxiliary air conditioning device 12 to adjust the temperature T in the defined space 2.

[0041] Figure 4 A diagram schematically illustrates a scheme of an apparatus 500. Figures 2 to 3 The control device 100 described may include a device 500 in the solution. The device 500 includes a non-volatile memory 520, a data processing unit 510 and a read / write memory 550. The non-volatile memory 520 has a first memory element 530, in which a computer program, such as an operating system, is stored for controlling the functions of the device 500. The device 500 also includes a bus controller, a serial communication port, an I / O device, an A / D converter, a time and date input and transmission unit, an event counter and an interrupt controller (not depicted). The non-volatile memory 520 also has a second memory element 540.

[0042] A computer program P is provided, which comprises instructions for executing the above method. The program P may be stored in the memory 560 and / or in the read / write memory 550 in an executable form or in a compressed form.

[0043] Where data processing unit 510 is described as performing a specific function, this means that data processing unit 510 implements a specific portion of a program stored in memory 560 or a specific portion of a program stored in read / write memory 550 .

[0044] The data processing device 510 can communicate with the data port 599 via a data bus 515. The non-volatile memory 520 is intended to communicate with the data processing unit 510 via a data bus 512. The separate memory 560 is intended to communicate with the data processing unit 510 via a data bus 511. The read / write memory 550 is adapted to communicate with the data processing unit 510 via a data bus 514.

[0045] When data is received on the data port 599, the data is temporarily stored in the second memory element 540. When the received input data has been temporarily stored, the data processing unit 510 is ready to implement code execution as described above.

[0046] Parts of the methods described herein may be implemented by the apparatus 500 with the aid of the data processing unit 510, which runs a program stored in the memory 560 or the read / write memory 550. When the apparatus 500 runs the program, the methods described herein are performed.

Claims

1. A system (1) for controlling humidity in a confined space (2), the system (1) comprising: an active air conditioner (4), the active air conditioner (4) being fluidically connected to the confined space (2); a control device (100) operatively coupled to the active air conditioner (4); at least one hygrometer (6, 14) arranged in the defined space (2) and operatively connected to the control device (100); A passive dehumidifier and humidifier (8), the passive dehumidifier and humidifier (8) comprising a hygroscopic material (10), the passive dehumidifier and humidifier (8) being configured to be accommodated in the defined space (2) and to be in contact with the air in the defined space (2); Characterized in that the control device (100) is configured to control the active air conditioner (4) based on information from the at least one hygrometer (6) to adjust the air in the confined space (2) to a Celsius dew point target value (CDPt), and the passive dehumidifier and humidifier (8) are configured to suppress fluctuations relative to the dew point target value (CDPt).

2. The system (1) according to claim 1, wherein: The dew point target value (CDPt) is in the range of -100 CDP to +12 CDP.

3. The system (1) according to any one of claims 1 and 2, wherein: The passive dehumidifier and humidifier (8) are configured to suppress fluctuations relative to the dew point target value (CDPt) within a range of 0.1CDP-2CDP.

4. The system (1) according to any one of the preceding claims, further comprising an auxiliary air conditioning device (12) fluidly connected to the confined space (2) and operatively coupled to the control device (100).

5. The system (1) according to claim 4, wherein: The auxiliary air conditioning device (12) is configured to adjust the temperature (t) in the confined space (2).

6. System (1) according to any one of the preceding claims, wherein: A first hygrometer (6) is arranged in the defined space (2), and a second hygrometer (14) is arranged at the passive dehumidifier and the humidifier (8), wherein the first hygrometer (6) and the second hygrometer (14) are operatively connected to the control device (100), and wherein the control device (100) is configured to control the active air conditioner (4) based on information from the first hygrometer (6) and the second hygrometer (14).

7. System (1) according to any one of the preceding claims, wherein: The passive dehumidifier and humidifier (8) comprises a housing (16) containing the hygroscopic material (10), wherein the housing (16) comprises at least one air permeable wall, such as a perforated wall (18).

8. System (1) according to any one of the preceding claims, wherein: The hygroscopic material (10) of the passive dehumidifier and humidifier (8) comprises a structured medium having a corrugated structure or a honeycomb structure.

9. A method for controlling the humidity in a confined space (2) using a system (1) according to any one of the preceding claims, wherein: The method comprises the following steps: Determining (s101) a dew point value in degrees Celsius (CDPs) in the defined space (2) by means of the at least one hygrometer (6, 14); controlling (s102) the active air conditioner (4) based on the determined Celsius dew point value (CDPs) to adjust the air in the confined space (2) to a dew point target value (CDPt); and Fluctuations relative to the dew point target value (CDPt) are suppressed (s103) by means of the passive dehumidifier and the humidifier (8).

10. The method according to claim 9, wherein: The step of controlling (s102) the active air conditioner (4) to condition the air in the confined space (2) to a target dew point value (CDPt) based on the determined Celsius dew point value (CDPs) includes dehumidifying the air in the confined space (2) to the target dew point value (CDPt).

11. The method according to claim 9, wherein: The step of controlling (s102) the active air conditioner (4) to adjust the air in the confined space (2) to a target dew point value (CDPt) based on the determined Celsius dew point value (CDPs) includes humidifying the air in the confined space (2) to the target dew point value (CDPt).

12. The method according to any one of claims 9 to 11, wherein: The at least one hygrometer (6, 14) comprises a first hygrometer (6) arranged in the confined space (2) and a second hygrometer (14) arranged at the passive dehumidifier and humidifier (8), and wherein the method comprises the further steps of: determining (s104) a Celsius dew point value (CDPp) at the hygroscopic material (10) of the passive dehumidifier and humidifier (8) by means of a second hygrometer (14); and The active air conditioner (4) is controlled (s105) based on the Celsius dew point value (CDPp) determined at the passive dehumidifier and humidifier (8).

13. The method according to any one of claims 9 to 12, wherein: The method comprises the following further steps: The auxiliary air conditioning device (12) is controlled (s106) to adjust the temperature (T) in the confined space (2).

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