Pollutant control system and method

Abstract

The present application relates to a kind of pollutant control systems and control method.Pollutant control system includes being arranged in the top or upper air outlet device of target space;Setting air return device in the bottom or lower part of target space;The target space includes target area, target area has the first boundary point away from air outlet and the second boundary point close to air outlet in horizontal direction, the angle α of air flow provided by air outlet device relative to horizontal plane is determined based on the horizontal distance of first boundary point and second boundary point in horizontal direction relative to air outlet and the vertical distance of first boundary point and second boundary point in vertical direction relative to air outlet, so that airflow covers at least a part or all of target area on its travel path.Using the pollutant control system and method according to the present application, a relatively independent safety zone can be generated for each person in the target space, and the airflow exhaled by each person does not cross, and even if the adjacent person is very close, there is no cross of exhaled airflow.

Description

Technical Field

[0001] This invention relates to an air conditioning system, and more specifically, to a pollutant control system. Background Technology

[0002] Since the beginning of this century, infectious diseases that are mainly transmitted through droplets and aerosols have emerged frequently, posing a great danger to human health. How to prevent such diseases in public places has become an urgent global issue.

[0003] Currently, natural ventilation in densely populated enclosed buildings such as office buildings is often insufficient, necessitating the installation of fresh air systems or air purification equipment to improve indoor air quality. Both fresh air systems and air purification equipment aim to deliver clean air into the indoor space and remove contaminated air to maintain air cleanliness. However, in practice, the unpredictable airflow within indoor spaces has revealed that these systems cannot effectively prevent cross-infection. This is particularly true in office environments where people often work face-to-face. Although partitions may be installed, the centralized return air from air conditioning or fresh air systems means that air flows through multiple workstations before entering the central return air vent, making cross-infection a serious problem.

[0004] Therefore, how to precisely control the airflow within the target space to avoid cross-infection of bacteria and viruses remains an unsolved problem. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a pollutant control system for a target space, comprising: an air outlet device disposed at the top or upper part of the target space, the air outlet device having an air outlet for delivering airflow into the target space; an air guide component disposed in the air outlet; and a return air device disposed at the bottom or lower part of the target space, configured to allow air from the target space to flow out of the target space; the target space includes a target area, the target area having a first boundary point away from the air outlet and a second boundary point near the air outlet in the horizontal direction, the airflow provided by the air outlet device at the height position of the air outlet being at an angle α relative to the horizontal plane determined based on the horizontal distance between the first boundary point and the second boundary point in the horizontal direction relative to the air outlet and the vertical distance between the first boundary point and the second boundary point in the vertical direction relative to the air outlet, such that the airflow path covers at least a portion or all of the target area.

[0006] According to one aspect of the invention, the air outlet has an outer edge that is far from the target area in the horizontal direction and an inner edge that is close to the target area. In the horizontal direction, the horizontal distance between the inner edge and the second boundary point is L1, and in the vertical direction, the vertical distance between the inner edge and the second boundary point is H1, with an angle α1 = arctan(H1 / L1). In the horizontal direction, the horizontal distance between the outer edge and the first boundary point is L4, and in the vertical direction, the vertical distance between the outer edge and the first boundary point is H4, with an angle α4 = arctan(H4 / L4). The angle α is controlled to be: α4 ≤ α ≤ α1.

[0007] According to another aspect of the invention, the air outlet has an outer edge that is far from the target area in the horizontal direction and an inner edge that is close to the target area. In the horizontal direction, the horizontal distance between the outer edge and the second boundary point is L3, and in the vertical direction, the vertical distance between the outer edge and the second boundary point is H3, with an angle α3 = arctan(H3 / L3). In the horizontal direction, the horizontal distance between the inner edge and the first boundary point is L2, and in the vertical direction, the vertical distance between the inner edge and the first boundary point is H2, with an angle α2 = arctan(H2 / L2). The angle α is controlled to be between α2 and α3.

[0008] According to another aspect of the invention, the system includes a plurality of air outlets and a plurality of target areas, the plurality of air outlets being included in one or more air outlet devices, each of the plurality of air outlets corresponding to one of the plurality of target areas.

[0009] According to another aspect of the invention, the pollutant control system further includes an air purification device having a filter assembly and a fan assembly, the air purification device being installed inside or outside the target space and in gas communication with a return air device and an outlet air device.

[0010] According to another aspect of the invention, an air guide is provided in the air outlet, and the angle θ between the air guide and the top of the target space corresponds to the angle α of the airflow relative to the horizontal plane, and the angle θ is controlled between 30° and 95°.

[0011] According to another aspect of the invention, the target space includes an obstacle that obstructs airflow, the target area is positioned above the obstacle, and the vertical distance between the obstacle and the target area is 0-0.6m; the horizontal width of the target area is set between 0.1m and 0.7m, the second boundary point of the target area is close to or aligned with the edge of the obstacle in the horizontal direction, the first boundary point of the target area is located further inside the edge of the obstacle, and the horizontal distance between the second boundary point and the edge of the obstacle is within 0.3m.

[0012] According to another aspect of the present invention, there is a pollutant generation site in the target space, the pollutant generation site coincides with the second boundary point of the target area, and the horizontal distance between the first boundary point of the target area and the pollutant generation site is 0.1m-0.7m.

[0013] According to another aspect of the invention, a return air device and two outlet air devices are used in combination. This combination can effectively prevent cross-infection between people sitting face-to-face in an office, and maximizes the utilization efficiency of the return air device by using one return air device to cover a larger area of ​​contaminants.

[0014] According to another aspect of the invention, a return air device and four outlet air devices are used in a group, wherein the return air device is positioned directly below the obstacle, and the four outlet air devices are distributed in at least two directions of the return air device.

[0015] According to another aspect of the invention, the pollutant control system further includes a control device configured to control an angle α based on the horizontal distance between the first boundary point and the second boundary point in the horizontal direction relative to the air outlet and the vertical distance between the first boundary point and the second boundary point in the vertical direction relative to the air outlet. Preferably, the system further includes a human detection sensor for detecting the position of a person; an air guide is provided in the air outlet; the angle between the air guide and the top of the target space is adjusted according to the detected position of the person to maintain at least a portion or all of the target area covered by the airflow path.

[0016] Furthermore, the present invention also provides a pollutant control system, comprising: an air outlet device disposed at the top or upper part of a target space, the air outlet device having at least one air outlet for delivering airflow into the target space; an air guide provided in the air outlet; a return air device disposed at the bottom or lower part of the target space, configured to allow air from the target space to flow out of the target space; a pollutant generation site located within the target space; an obstacle disposed below the pollutant generation site and having at least one proximal edge adjacent to the pollutant generation site; the angle θ between the air guide and the top of the target space is determined based on the position of the air outlet and the proximal edge of the obstacle and / or the pollutant generation site.

[0017] According to one aspect of the invention, the pollutant generation site is located at a height higher than the height of the obstacle in the target space, and the pollutant is dispersed above the obstacle from the pollutant generation site. The pollutant generation site is located above or outside the edge of the obstacle, and the horizontal distance between the pollutant generation site and the obstacle is set within 0.3m. In the vertical direction, the vertical distance between the obstacle and the pollutant generation site is set in the range of 0-0.6m.

[0018] According to another aspect of the invention, the air outlet has an outer edge that is away from an obstacle in the horizontal direction and an inner edge that is close to the obstacle. A preset distance D is set from the near edge. In the horizontal direction, the distance between the inner edge and the near edge is La. In the vertical direction, the vertical distance between the inner edge and the near edge is Ha. Angle β1 = arctan(Ha / La). In the horizontal direction, the horizontal distance between the outer edge and the near edge is Lb. In the vertical direction, the vertical distance between the outer edge and the near edge is Hb. Angle β2 = arctan[Hb / (Lb+D)]. Angle θ is controlled to be: β2≤θ≤β1.

[0019] According to another aspect of the invention, the air outlet has an outer edge that is away from an obstacle in the horizontal direction and an inner edge that is close to an obstacle. A preset distance D is set from the near edge. In the horizontal direction, the horizontal distance between the outer edge and the near edge is Lb, and in the vertical direction, the vertical distance between the outer edge and the near edge is Hb. Angle β3 = arctan(Hb / Lb) is given. In the horizontal direction, the horizontal distance between the inner edge and the near edge is La, and in the vertical direction, the vertical distance between the inner edge and the near edge is Ha. Angle β4 = arctan[Ha / (La+D)] is given. Angle θ is controlled to be between β3 and β4.

[0020] The preset distance D can be between 0.1 and 1m.

[0021] According to another aspect of the invention, the angle θ between the air guide and the top of the target space can be determined based on the near edge of the obstacle. Pollutants generated at the pollutant generation site disperse from the near edge of the obstacle to the far edge, forming a far boundary point. The air outlet has an outer edge far from the obstacle in the horizontal direction and an inner edge close to the obstacle. In the horizontal direction, the horizontal distance between the inner edge and the near edge of the obstacle is L5, and in the vertical direction, the vertical distance between the inner edge and the obstacle is H5, with an angle α5 = arctan(H5 / L5). In the horizontal direction, the horizontal distance between the outer edge and the far boundary point is H6, and in the vertical direction, the vertical distance between the outer edge and the obstacle is L6, with an angle α6 = arctan(H6 / L6). The angle α is controlled to be α6 ≤ α ≤ α5.

[0022] According to another aspect of the invention, the angle θα between the air guide and the top of the target space can be determined based on the near edge of the obstacle. Pollutants generated at the pollutant generation site disperse from the near edge of the obstacle to the far edge, forming a far boundary point. The air outlet has an outer edge far from the obstacle in the horizontal direction and an inner edge close to the obstacle. In the horizontal direction, the horizontal distance between the outer edge and the obstacle edge is L7, and in the vertical direction, the vertical distance between the outer edge and the obstacle is H7, with an angle α7 = arctan(H7 / L7). In the horizontal direction, the horizontal distance between the inner edge and the far boundary point is L8, and in the vertical direction, the vertical distance between the inner edge and the obstacle is L8, with an angle α8 = arctan(H8 / L8). The angle α is controlled between α7 and α8.

[0023] According to another aspect of the invention, the air outlet is provided with one or more air guides, and the angle θ of at least one of the air guides relative to the top of the target space is determined according to the position of the air guide relative to the proximal edge of the obstacle, wherein in the horizontal direction, the horizontal distance of at least one of the air guides relative to the proximal edge of the obstacle is L9, and in the vertical direction, the vertical distance of at least one of the air guides relative to the proximal edge of the obstacle is H9, and the angle θ of at least one of the air guides is determined to be within the range of α9 ± 10°, where α9 = arctan(H9 / L9).

[0024] According to another aspect of the invention, the air outlet is provided with one or more air guides, and the angle θ of at least one of the air guides relative to the top of the target space is determined according to the position of the air guide relative to the pollutant generation site, wherein in the horizontal direction, the horizontal distance of at least one of the air guides relative to the pollutant generation site is L10, and in the vertical direction, the vertical distance of at least one of the air guides relative to the pollutant generation site is H10, and the angle θ of at least one of the air guides is determined to be within the range of α10±10°, where α10=arctan(H10 / L10).

[0025] Furthermore, the angle θ can be determined based on the position of the center of the air outlet or the position of the outer edge of the air outlet relative to the near edge of the obstacle. In the horizontal direction, the horizontal distance between the center of the air outlet and the near edge of the obstacle is L11, and in the vertical direction, the vertical distance between the center of the air outlet and the near edge of the obstacle is H11. The angle θ of at least one of the air guides is determined to be within the range of α11 ± 10°, where α11 = arctan(H1 / L11).

[0026] Alternatively, in the horizontal direction, the horizontal distance between the outer edge of the air outlet and the near edge of the obstacle is L12, and in the vertical direction, the vertical distance between the outer edge of the air outlet and the near edge of the obstacle is H12, and the angle θ of at least one of the air guides is determined to be within the range of α12±10°, where α12=arctan(H12 / L12).

[0027] The present invention also provides an airflow control method, comprising: setting an air outlet device at the top or upper part of a target space, the air outlet device having an air outlet for sending airflow into the target space; setting a return air device at the bottom or lower part of the target space, configured to allow air from the target space to flow out of the target space; defining a target area in the target space, such that the target area has a first boundary point far from the air outlet and a second boundary point close to the air outlet in the horizontal direction; controlling the airflow blowing angle α provided by the air outlet device at the height position of the air outlet based on the horizontal distance between the first boundary point and the second boundary point in the horizontal direction relative to the air outlet and the vertical distance between the first boundary point and the second boundary point in the vertical direction relative to the air outlet, so that the airflow path covers at least a part or all of the target area.

[0028] The present invention also provides an air outlet device, comprising: an air guide plate disposed at an air outlet; and a stepper motor, wherein the stepper motor causes the air guide plate to be adjusted according to the airflow control method described above to correspond to multiple different target areas, so that the airflow path covers at least part or all of the target areas.

[0029] By employing the pollutant control device, airflow control method, and / or exhaust device according to the present invention, the flow direction of pollutants in a specific area of ​​a target space can be controlled, preventing cross-contamination or other adverse effects within the target space. Especially when obstacles exist in the target space, it can effectively ensure that pollutants leave the target space via the return air device through the shortest path. Attached Figure Description

[0030] To gain a more complete understanding of the invention, reference can be made to the following description of exemplary embodiments taken in conjunction with the accompanying drawings, in which: Figure 1 A conceptual schematic diagram of a pollutant control system according to a preferred embodiment of the present invention is shown.

[0031] Figure 2 This is a schematic diagram of a pollutant control system according to a preferred embodiment of the present invention, showing the positional relationship between the inner edge of the air outlet and the second boundary of the target area.

[0032] Figure 3This is a schematic diagram of a pollutant control system according to a preferred embodiment of the present invention, showing the positional relationship between the inner edge of the air outlet device and the first boundary of the target area.

[0033] Figure 4 This is a schematic diagram of a pollutant control system according to a preferred embodiment of the present invention, showing the positional relationship between the outer edge of the air outlet device and the second boundary of the target area.

[0034] Figure 5 This is a schematic diagram of a pollutant control system according to a preferred embodiment of the present invention, showing the positional relationship between the outer edge of the air outlet device and the first boundary of the target area.

[0035] Figure 6 A top view of a configuration in the target space of a pollutant control system according to a preferred embodiment of the present invention.

[0036] Figure 7 It shows the use of press Figure 6 The diagram shows the treatment effect in the target space after the pollutant control system according to the present invention performs airflow control treatment on the target space, as arranged in the manner shown.

[0037] Figure 8 A schematic diagram illustrating another treatment effect in a target space after treatment using the pollutant control system according to the present invention is shown.

[0038] Figure 9 A schematic diagram illustrating another treatment effect in a target space after treatment using the pollutant control system according to the present invention is shown.

[0039] Figure 10A and Figure 10B The diagram shows a top view of the target space layout when an air purifier is used to treat the target space, and a schematic diagram of the effect after treatment.

[0040] Figure 11A and Figure 11B The diagram shows a top view of the target space layout when using an indoor air conditioning unit to process the target space, and a schematic diagram of the processed effect.

[0041] Figure 12A and Figure 12B The diagram shows a top view of the target space layout when air handling equipment is used to process the target space, and a schematic diagram of the effect after processing.

[0042] List of reference numerals

[0043] 10. Air outlet device

[0044] 20 Return air device

[0045] 30 Target Space

[0046] 40 Target Area

[0047] 50 obstacles

[0048] 60 air purification devices Detailed Implementation

[0049] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0050] To suppress the upward diffusion of pollutants, especially pollutants in people's exhaled air, which can then spread to other people, one specific embodiment of the present invention involves using an air outlet device positioned above or above the target space to deliver air at an angle roughly corresponding to people's exhaled air. This is combined with a return air device positioned below or below the target space to draw air in. The airflow created by the supply and draw-in airflow suppresses the upward and outward diffusion of pollutants, causing them to concentrate and flow towards the return air device, leaving the target space. This creates a safe zone near people (free of pollutants or with very low concentrations that do not affect people's health), reducing the risk of cross-infection in the target space.

[0051] The angle of the airflow from the exhaust device plays a crucial role in suppressing the upward diffusion of pollutants. In one specific embodiment of the invention, the angle range of the exhaust airflow is determined by the vertical and horizontal distances between the exhaust outlet of the exhaust device and the polluted area (target area). Here, the vertical distance typically refers to the height difference between two relative positions in the direction perpendicular to the ground. In another specific embodiment of the invention, since the distance between a person and an obstacle (table) and the person's sitting height are relatively fixed, the angle of the exhaust airflow can be determined by the vertical and horizontal distances between the exhaust outlet and the edge of the obstacle (the position closest to the person).

[0052] When installing the air outlet device on site, some positions on the ceiling may already be occupied by light fixtures, fire sprinkler heads, etc. In this case, you can choose an empty installation position and control the pollutants by controlling the angle mentioned above.

[0053] In one specific embodiment of the present invention, a smaller outlet air velocity combined with a larger return air velocity creates an airflow field to suppress the upward diffusion of pollutants. If the outlet air velocity is too high, the airflow will bounce back upwards after hitting the surface of the obstacle, and this return flow will carry the pollutants upwards. One function of the return air device's suction force is to suppress the return flow near the breathing position of personnel. However, if the outlet air velocity is too high, the suction force of the return air device cannot counteract or suppress this return flow, instead causing the pollutants to be carried upwards and diffused. Therefore, combining a smaller outlet air velocity with a larger return air velocity is advantageous. In this disclosure, the outlet air velocity refers to the air velocity at the outlet of the outlet air device, and the return air velocity refers to the air velocity at the return air inlet of the return air device.

[0054] The pollutant control system in this invention can be applied in offices and conference rooms to control pollutants exhaled by people, or to control pollutants generated by things such as printers, or it can be extended to other suitable scenarios.

[0055] Figure 1 A conceptual schematic diagram of a pollutant control system according to a preferred embodiment of the present invention is shown. This pollutant control system is particularly suitable for indoor spaces such as offices, which are referred to in the preferred embodiment as target space 30. It should be understood that target space 30 can refer to the entire indoor space or a continuous spatial portion within the indoor space. The indoor space may, for example, be equipped with a desk, which constitutes an obstacle 50 within the target space. This obstacle specifically includes obstacles that impede airflow in the vertical direction of target space 30, typically having an obstacle surface extending laterally to the vertical direction. Above the desk, near its edge, exists a pollutant generation point, i.e., the breathing point (mouth and nose area) of the person using the desk. Due to the inertia of the pollutants, this generation point further generates a contaminated area in its forward direction, which is considered the target area 40. The pollutant control system according to the present invention precisely controls the airflow in target space 30 so that pollutants dispersed in target area 40 leave target space 30 via the safest path.

[0056] Specifically, the pollutant control system includes an air outlet device 10 and a return air device 20.

[0057] One or more air outlet devices 10 may be installed, and they are located at the top or upper part of the target space 30. Figure 1 In the illustrated embodiment, two air outlets 10 are spaced apart and installed in the ceiling of the office. It should be understood that, in alternative embodiments, the air outlets 10 may also be installed on the walls of the office near the ceiling.

[0058] The return air device 20 can be one or more, and it is located at the bottom or lower part of the target space. Figure 1 In the illustrated embodiment, a return air device 20 is installed in the office floor. When the system is running, the space in the ceiling and the space in the floor form part of the airflow path. Airflow flows from the ceiling space into the outlet air device 10 and then exits from the outlet air device 10. The exiting airflow, as clean airflow, passes through the target space from top to bottom, drawing some air from the target area away from the target space through the return air device 20. In a preferred embodiment of the invention, the outlet air device 10 preferably includes a fan assembly, while the return air device 20 includes a return air fan assembly and a filter assembly. The filter assembly in the return air device 20 may include a PM2.5 filter and a particulate matter purification filter to treat the airflow leaving the target space accordingly.

[0059] In some applications, the airflow drawn from the target space by the return air device 20 can be directly discharged into the atmosphere. In this case, the return air device 20 may not include a filter. However, for other applications where direct discharge is not suitable, the system may further include an air purification device 60. In this case, the return air device 20 may not include a filter. The air purification device 60 is connected between the return air device 20 and the outlet air device 10 in the airflow path, and can further process the air drawn from the return air device 20 before sending it back to the target space through the outlet air device 10. Preferably, as shown... Figure 1 As shown, the air purification device 60 can be installed outside the target space 30 and connected to the air outlet device 10 and the return air device 20 via ductwork. Alternatively, the air purification device 60 can also be installed inside the target space 30, typically near one wall. The air purification device 60 may include a filter assembly and a fan assembly. The filter assembly further filters the extracted airflow, while the fan assembly provides the driving force for airflow, enabling airflow circulation between the air outlet device 10 and the return air device 20.

[0060] Importantly, in the pollutant control system for controlling pollutants in target space 10, the exhaust airflow of the exhaust device 10 is controlled along its path to cover at least part or all of the target area. To precisely control the direction of pollutant flow, the angle α of the exhaust airflow of the exhaust device 10 relative to the horizontal plane needs to be precisely controlled. Figures 2 to 5In the preferred embodiment shown, the air outlet device 10 includes an air guide and a stepper motor capable of controlling the rotation angle of the air guide. The angle α of the airflow is controlled by controlling the angle θ of the air guide relative to the ceiling. Normally, at the height of the air outlet of the air outlet device 10, the angle α of the airflow relative to the horizontal plane is equal to the angle θ between the air guide of the air outlet device 10 and the ceiling or top of the target space 30. In the preferred embodiment, as... Figures 2 to 5 As shown, angle α is determined based on the horizontal distances of the first boundary point of the target area 40 away from the pollutant generation site and the second boundary point of the target area 40 near the pollutant generation site relative to the air outlet in the horizontal direction, and the vertical distances of the first boundary point and the second boundary point relative to the air outlet in the vertical direction, so that the airflow path covers at least part or all of the target area 40. That is, the target area 40 is directly propelled by the airflow along a roughly straight path. The direct propelling effect of the airflow prevents the pollutants in the target area 40 from spreading further upward and horizontally, especially from spreading away from the first boundary point, but instead draws them into the return air device 20 around the edge of the obstacle 50.

[0061] The pollutant control system may further include a control device that controls the angle α based on the horizontal distance between the first boundary point and the second boundary point of the target area 40 and the air outlet in the horizontal direction, and the vertical distance between the first boundary point and the second boundary point of the target area 40 and the air outlet in the vertical direction. More specifically, the control device controls the included angle θ between the air guide and the top of the target space 30.

[0062] The following, combined with Figures 2 to 5 Taking the target area 40 on the left side of the diagram as an example, the setting of the angle α of the airflow relative to the horizontal plane will be explained in detail.

[0063] like Figures 2 to 5 As shown, the pollutant control system includes four separately arranged air outlet devices 10 located at the top of the target space 30 and a return air device 20 located at the center below the obstacle 50. For ease of understanding, in the illustrated embodiment, the air outlet devices 10, the return air device 20, and the obstacle are symmetrically arranged about the centerline of the return air device 20. Taking a person on the left side of the obstacle 50 as an example, their mouth and nose position is considered the pollutant generation site in the target space 30. Following the direction of the breathing airflow, pollutants will form a target area 40 for natural pollutant dispersion, which is located above the obstacle 50 and close to the left edge of the obstacle. The target area 40 has a first boundary point in the direction of the far edge of the obstacle 50 and a second boundary point in the direction of the near edge of the obstacle 50, wherein the second boundary point corresponds to the pollutant generation site and is preferably set outside the near edge of the obstacle 50.

[0064] like Figure 2 As shown, one of the two air outlet devices 10 on the left is positioned directly above the formed pollutant target area 40, while the other is positioned offset from the target area 40 to the outside of the obstacle 50. It should be understood that the offset can also be a partial offset to the outside of the obstacle 50. The air outlet device 10 directly above the target area 40 has its airflow angle α relative to the horizontal plane set to 90°±5°, optionally set to 90°. The outlet of the outer air outlet device 10 has an outer edge that is away from the target area 40 in the horizontal direction and an inner edge that is close to the target area. In the horizontal direction, the horizontal distance between the inner edge of the outlet and the second boundary point of the target area is L1, and in the vertical direction, the vertical distance between the inner edge of the outlet and the second boundary point is H1. In this case, the critical angle α1 = arctan(H1 / L1). Figure 3 As shown, in relation to Figure 2 In the same arrangement of the air outlet device 10 and the return air device 20, in the horizontal direction, the horizontal distance between the outer edge of the air outlet of the outer air outlet device 10 and the first boundary point of the target area is L4, and in the vertical direction, the vertical distance between the outer edge of the air outlet and the first boundary point is H4. In this case, the boundary angle α4 = arctan(H4 / L4). The angle α of the air outlet device 10 should be controlled to α4 ≤ α ≤ α1, so that the airflow covers at least a portion of the target area along its path.

[0065] In another preferred embodiment, such as Figure 4 As shown, in relation to Figure 2 In the same arrangement of the air outlet device 10 and the return air device 20, the air outlet of the left-hand air outlet device 10 has an outer edge that is far from the target area 40 in the horizontal direction and an inner edge that is close to the target area 40. In the horizontal direction, the horizontal distance between the outer edge of the air outlet device 10 and the second boundary point of the target area 40 is L3, and in the vertical direction, the vertical distance between the outer edge of the air outlet device 10 and the second boundary point of the target area 40 is H3. At this time, the critical angle α3 = arctan(H3 / L3). Meanwhile, as... Figure 5 As shown, in the horizontal direction, the horizontal distance between the inner edge of the air outlet 10 and the first boundary point of the target area is L2, and in the vertical direction, the vertical distance between the inner edge of the air outlet 10 and the first boundary point of the target area is L2, with an angle α2 = arctan(H2 / L2). The angle α of the air outlet 10 on the left should be controlled between α2 and α3. Using this method, the airflow path can essentially cover the entire target area, thus forming a safe zone.

[0066] In a preferred embodiment, the airflow angle α is controlled between 30° and 95°.

[0067] Furthermore, in a preferred embodiment, the pollutant control system includes a plurality of air outlet devices 10, each air outlet device 10 having an air outlet, and each air outlet corresponding to a target area that needs to be precisely controlled.

[0068] In alternative embodiments, multiple air outlets can be provided in a single air outlet device 10, each corresponding to a target area that needs to be precisely controlled. For example, a two-sided air outlet device has a quadrilateral shape with air inlets on opposite sides, and each air outlet emits air in two opposite directions according to a set air outlet angle α, thereby controlling pollutants. As another example, a four-sided air outlet device has a quadrilateral shape with air outlets on all four sides, and the four air outlets emit air in four directions according to a set air outlet angle α, thereby controlling pollutants. When using an indoor air conditioning unit as the air outlet device, a four-sided air outlet device is a four-sided air conditioning indoor unit, and a two-sided air outlet device is a two-sided air conditioning indoor unit.

[0069] like Figure 2 - Figure 5 As shown, there is an obstacle 50 in the target space of the pollutant control system that obstructs airflow, and the obstacle 50 directly covers the return air device 20, especially the entire air inlet of the return air device 20. In this system, precise control of angle α can prevent pollutants in the left target area from traveling along the extension plane of the obstacle to the far edge of the obstacle 40, and instead confine them to the middle area of ​​the obstacle 50 near the left edge, and cause most of the pollutants to flow downwards around the near edge and into the return air device 20 below the obstacle 50.

[0070] Preferably, the vertical height distance between the obstacle 50 and the target area 40 is set to 0-0.6m. The horizontal width distance of the target area 40 is set to 0.1m-0.7m. The second boundary point of the target area 40 is close to or aligned with the edge of the obstacle 50. Preferably, the horizontal distance between the second boundary point of the target area 40 and the near edge of the obstacle 50 is within ±0.3m (here, the near edge of the obstacle 50 is set as the coordinate point 0m).

[0071] According to the experiment, under normal human breathing conditions, the horizontal distance between the first boundary point of the target area and the pollutant generation site is 0.1m-0.7m. In other words, the horizontal distance between the first boundary point and the second boundary point of the target area is in the range of 0.1m-0.7m.

[0072] In a pollutant control system according to a specific embodiment of the present invention, preferably, the velocity of the outgoing airflow from the outlet air device 10 should be controlled at a low level to avoid disturbing the pollutants in the target area 40, causing the pollutant-containing airflow to form eddies and backflow, resulting in pollutant diffusion. In some optional embodiments, the outlet airflow velocity of the outlet air device 10 is not greater than 0.6 m / s (here, the outlet airflow velocity refers to the airflow velocity at the outlet of the outlet air device). At the same time, it should be ensured that the return air velocity of the return air device 20 is greater than the outlet airflow velocity (here, the return airflow velocity refers to the airflow velocity at the return air outlet of the return air device), so that the return air device 20 generates sufficient suction to form a "relay" with the outlet airflow, thereby suppressing the upward diffusion trend of pollutants and causing the pollutant-containing airflow to flow roughly downward into the return air device 20. In some optional embodiments, the return airflow velocity is not less than 3 m / s. In addition, the return airflow volume of the return air device should also be ensured so that the pollutant-containing airflow in the target area 40 can flow out of the target space in a timely manner. In some optional embodiments, the return air volume of the return air device 20 is set to at least 600 m³ / h. 3 / h. Optionally, the return air device 20 can be configured to selectively set the return air volume and return air velocity, so that the energy-efficient return air volume and return air velocity can be used when corresponding to different pollutant concentrations (i.e. different number of users).

[0073] According to another embodiment of the present invention, the angle α between the airflow from the outlet of the air outlet device 10 and the horizontal plane can be determined with reference to the position of the air outlet and the edge of the obstacle and / or the pollutant generation site, so that the airflow covers at least part or all of the target area along its travel path. In actual devices, the angle α between the airflow and the horizontal plane is generally controlled by the angle θ between the air guide element provided in the air outlet and the horizontal plane, and the two angles mentioned above are the same.

[0074] The included angle θ can be determined as follows: by examining the edge of the obstacle and the location where the contaminant occurs: For a target space containing an obstacle 50, the pollutant control system includes an air outlet device 10 located at the top or upper part of the target space 30, return air devices 20 located at the bottom and lower part of the target space 30, and a pollutant generation point. The height of the pollutant generation point is higher than the height of the obstacle 50, and pollutants are dispersed from the pollutant generation point to above the obstacle 50. The air outlet of the air outlet device 10 is equipped with multiple air guides to guide the direction of the outgoing airflow. The angle θ between each air guide and the top of the target space 30 is determined based on the position of the air outlet relative to the edge of the obstacle and the pollutant generation point.

[0075] Preferably, the angle θ between the air guide and the top of the target space is determined based on the near edge of the obstacle (i.e., the edge closest to the pollutant generation site). In the horizontal direction, the horizontal distance between the inner edge of the air outlet and the edge of the obstacle is L5; in the vertical direction, the vertical distance between the inner edge of the air outlet and the obstacle is H5, with angle α5 = arctan(H5 / L5). In the horizontal direction, the horizontal distance between the outer edge of the air outlet and the far boundary point of the pollutant is L6; in the vertical direction, the vertical distance between the outer edge of the air outlet and the obstacle is L6, with angle α6 = arctan(H6 / L6). The angle θ is controlled to be: α6 ≤ α ≤ α5.

[0076] Alternatively, in the horizontal direction, the horizontal distance between the outer edge of the air outlet and the edge of the obstacle is L7; in the vertical direction, the vertical distance between the outer edge of the air outlet and the obstacle is H7, with an angle α7 = arctan(H7 / L7). In the horizontal direction, the horizontal distance between the inner edge of the air outlet and the far boundary point of the pollutant is L8; in the vertical direction, the vertical distance between the inner edge of the air outlet and the obstacle is L8, with an angle α8 = arctan(H8 / L8). Ideally, the angle α should be controlled between α7 and α8. In this way, the airflow path can basically cover the entire range between the pollutant generation site and the far boundary point of the pollutant.

[0077] The angle θ between the air outlet guide and the top of the target space can be determined by referring to the near edge of the obstacle as follows: First, the position of the center of the air outlet relative to the near edge of the obstacle is determined, wherein the horizontal distance of the center of the air outlet relative to the near edge of the obstacle in the horizontal direction is L11, and the vertical distance of the center of the air outlet relative to the near edge of the obstacle in the vertical direction is H11. The angle θ of at least one of the air guides is determined to be within the range of α11±10°, where α11=arctan(H1 / L11).

[0078] Second, the position of the outer edge of the air outlet relative to the near edge of the obstacle is determined, wherein in the horizontal direction, the horizontal distance between the outer edge of the air outlet and the near edge of the obstacle is L12, and in the vertical direction, the vertical distance between the outer edge of the air outlet and the near edge of the obstacle is H12, and the angle θ of at least one of the air guides is determined to be within the range of α12±10°, where α12=arctan(H12 / L12).

[0079] Third, the distance D is determined based on the air outlet relative to the near edge of the obstacle and a preset distance D from the near edge. Specifically, the air outlet has an outer edge away from the obstacle and an inner edge close to the obstacle in the horizontal direction, while a preset distance D is set from the near edge of the obstacle. This preset distance is 0.1-1m, optionally 0.7m, 0.5m, or 0.3m, and can be set according to the usage environment and control requirements. In the horizontal direction, the distance between the inner edge and the near edge is La, and in the vertical direction, the vertical distance between the inner edge and the near edge is Ha, with an angle β1=arctan(Ha / La). In the horizontal direction, the horizontal distance between the outer edge and the near edge is Lb, and in the vertical direction, the vertical distance between the outer edge and the near edge is Hb, with an angle β2=arctan[Hb / (Lb+D)]. The angle θ is controlled as follows: β2≤θ≤β1.

[0080] The air outlet has an outer edge that is far from the obstacle in the horizontal direction and an inner edge that is close to the obstacle. A preset distance D is set from the near edge. In the horizontal direction, the horizontal distance between the outer edge and the near edge is Lb, and in the vertical direction, the vertical distance between the outer edge and the near edge is Hb. The angle β3 = arctan(Hb / Lb). In the horizontal direction, the horizontal distance between the inner edge and the near edge is La, and in the vertical direction, the vertical distance between the inner edge and the near edge is Ha. The angle β4 = arctan[Ha / (La+D)]. The angle θ is controlled between β3 and β4.

[0081] At least one air guide is provided in the air outlet, and the air guides in one air outlet are all set at the same angle. The angle α of the air guide is set with reference to the relative position of the air outlet and the edge of the obstacle. Specifically, in the horizontal direction, the horizontal distance between at least one air guide and the near edge of the obstacle is L9, and in the vertical direction, the vertical distance between the at least one air guide and the near edge of the obstacle is H9. The angle θ of the air guide is determined as α9 = arctan(H9 / L9). Preferably, the angle of each of the plurality of air guides in the air outlet is set in this way.

[0082] It should be understood that in some embodiments, two or more air guides are provided in an air outlet, and the angles of some air guides and the angles of other air guides may be different. Thus, by setting different angles of the air guides in different parts of an air outlet (e.g., the left half and the right half of the air outlet), two target areas, two obstacles, or two pollutant occurrence sites can be corresponded.

[0083] In an alternative embodiment, the angle θ of at least one of the plurality of air guides at the air outlet can be set with reference to the relative position of the air outlet and the pollutant generation site. Specifically, in the horizontal direction, the horizontal distance between at least one of the air guides and the pollutant generation site is L10, and in the vertical direction, the vertical distance between each of the air guides and the pollutant generation site is H10. The angle θ of the air guide is determined as α10 = arctan(H10 / L10). Preferably, the angle of each of the plurality of air guides in the air outlet is set in this way.

[0084] Furthermore, a human detection sensor can be installed in the pollutant control system to detect the position of people within the target space. The human detection sensor transmits the detected person's position to the system's control unit, thereby determining the location of the pollutant generation point. This allows for control of the angle θ of the air outlet's guide vanes or the angle α between the air outlet's airflow and the horizontal plane. The sensor can be installed on the air outlet or within the target space, such as on the ceiling, side walls, or desk; it can be a single sensor or multiple sensors. Using multiple sensors to detect changes in a person's position can improve detection accuracy.

[0085] In some embodiments, the width of the air outlet of the air outlet device is, for example, Figure 2 Ideally, the distance between the inner and outer edges of the air outlet device should not be less than 0.2m to avoid the airflow being too narrow and the effect of guiding pollutants being reduced.

[0086] Furthermore, the air guide vanes in the air outlet device can be angled to target areas at multiple different locations within the target space via a stepper motor. The angle and position can be preset in the control device or controlled in real-time based on signals from sensors such as human detection sensors. These multiple target areas are, for example, located at different distances from the air outlet device in the horizontal direction.

[0087] The aforementioned pollutant control system can be advantageously used in the layout of spaces requiring air treatment, such as offices, where obstacles include desks.

[0088] Experiments have shown that the pollutant control system according to the present invention can accurately control the flow of pollutants. Especially when used in an office, a safe zone can be formed around each workstation, and the airflow exhaled by each worker will not cross.

[0089] In the experiment, CO2 was used to represent the pollutant, and the removal effect of CO2 indirectly reflects the removal effect on other pollutants. Actual measurements showed that the initial CO2 concentration in an unoccupied room (i.e., the CO2 concentration in the outside air) was approximately 400 ppm. In a space of approximately 100 m², the initial CO2 concentration was...3 In a room, the exhaled air of four people increases CO2 by about 350 ppm every 30 minutes. Furthermore, CO2 is directly proportional to the number of people and time, but inversely proportional to the room volume.

[0090] It should be noted that, in order to more intuitively demonstrate the effect of the technical solution provided by this invention, the following sections use CFD simulation results. To make the results visually significant, the simulation results have undergone a certain degree of grayscale processing; the parts with higher grayscale values ​​represent relatively higher pollutant concentrations. The pollutant generation sites (i.e., the mouth and nose area) are marked with wireframes in the figure.

[0091] Example 1: Figure 6 The layout of the target space is shown: there is a table (i.e., an obstacle) in the target space, and two chairs are placed on each side of the table, for a total of four chairs. A return air device 20 is placed on the ground corresponding to the center of the table, and four air outlet devices 10 are placed on the ceiling. Each air outlet device 10 corresponds to one chair and is placed on the ceiling behind the chair.

[0092] In the CFD simulation model, the height of the target space is 3m, the sitting height of a person in a chair is approximately 1.3m, the horizontal distance L between the outer edge of the air outlet and the person's mouth and nose (i.e., the pollutant generation site) is approximately 0.95m, and the vertical distance H between the outer edge of the air outlet and the head of the person in the chair is approximately 1.7m. To ensure that the airflow from the air outlet basically corresponds to the pollutants exhaled from the mouth and nose, based on L and H, the angle α between the airflow direction of the air outlet and the ceiling is α = arctan(H / L) = arctan(1.7 / 0.95) = 60.8°. Therefore, the angle α between the air guide plate of the air outlet and the ceiling is set to 60°.

[0093] The outlet airflow velocity is 0.23 m / s, and the length and width of the outlet are 0.65 m. The inlet is 0.5m high, the intake air velocity is 4 m / s, and the length and width of the return air inlet are 0.6 m. 0.048 m, after simulating for 30 minutes under these conditions, the results are as follows: Figure 7 As shown in the CO2 range of 400-1000ppm, at the cross-section of a person's breathing height (1.2m above the ground), a ring-shaped safety zone is generated around each person. That is, pollutants only show a high concentration within a very small range away from the person, and the exhaled gas will not cross or flow back and be inhaled again.

[0094] Example 2

[0095] The overall layout of the target space in Example 2 is similar to that in Example 1, except that the distance between the two chairs on the same side is 0m, and the air outlet device 10 is also adaptively repositioned to correspond to the person. The results after a 30-minute simulation are as follows. Figure 8 As shown, although the distance between the two people's seats is 0m, there is still no crossover of their exhaled airflow.

[0096] Example 3

[0097] The overall layout of Example 3 is similar to that of Example 1, except that the position of the air outlet device 10 is changed. The outer edge of the air outlet device roughly corresponds to the position of the mouth and nose in the vertical direction. In order to ensure that the airflow delivered by the air outlet device basically corresponds to the pollutants exhaled from the mouth and nose, the angle α between the air guide plate of the air outlet device and the ceiling is 90°.

[0098] After 30 minutes of simulation, the results are shown in Figure 9. At the cross-section of a person's breathing height (1.2m above the ground), a ring-shaped safety zone is generated around each person, and the exhaled air will not cross or flow back and be inhaled again.

[0099] Comparative Example

[0100] As a comparative example, such as Figure 10A , Figure 11A and Figure 12A As shown, air purifiers, air conditioning indoor units with air outlets around the perimeter and return air from the center of the panel (e.g., four-sided air outlet embedded air conditioning indoor units), air handling units with separate air outlets and return air inlets, and top-supply and top-return air handling units (e.g., AHU air conditioning units) are used to treat the air in the target space to remove carbon dioxide. The air purifier uses... Figure 10A The air conditioning indoor unit is arranged as shown in the diagram. Figure 11A The air handling equipment is arranged as shown, and the air handling unit adopts the following configuration: Figure 12A The arrangement shown ensures that the return air volume of the air purifier, indoor air conditioner unit, and air handling unit is approximately 800m³ / h. 3 / h, 1000 m 3 / h, 1000m 3 / h.

[0101] The results after 30 minutes of simulation are as follows Figure 10B , Figure 11B and Figure 12B As shown, at the height of human respiration, the CO2 concentration exceeded 500 ppm in all three cases, and cross-contamination of exhaled gases between different individuals was observed. Furthermore, the agitation caused by air purifiers throughout the room can easily lead to cross-infection. When the pollutants are bacteria or viruses, the rate of increase in these pollutants relatively increases the likelihood of cross-infection.

[0102] Table 1 shows the pollutant control system according to the present invention (return air volume is approximately 800 m³ / h). 3 The table shows the CFD simulation results for each comparative example (in the case of / h), where the values ​​represent the indoor CO2 concentration after a period of operation. As can be seen from Table 1, after 20 minutes of operation, the indoor CO2 concentration of the pollution control system according to the present invention is approximately 460 ppm, and then stabilizes at around 460 ppm. However, after 60 minutes of operation using an air purifier, an indoor air conditioning unit, and an air handling unit, the indoor CO2 concentration is significantly higher than that of the pollution control system using the present invention. Especially when using the AHU1000, the CO2 concentration continues to increase over time.

[0103] Table 1

[0104] By employing the pollutant control system and method according to the present invention, a relatively independent safe zone can be generated for each person in the target space, and the airflow of each person will not cross. Even if people sitting next to each other are very close, there will be no crossover of their exhaled airflows, and the pollutant capture rate in the space can reach at least 90%.

[0105] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A pollutant control system for a target space, characterized in that, include: An air outlet device is disposed at the top or upper part of the target space, and the air outlet device has an air outlet for sending airflow into the target space. A return air device, wherein the return air device is disposed at the bottom or lower part of the target space and is configured to allow air to flow out of the target space; The target space includes a target area, which has a first boundary point away from the air outlet and a second boundary point near the air outlet in the horizontal direction. The air outlet has an outer edge away from the target area and an inner edge near the target area in the horizontal direction. The angle α between the airflow provided by the air outlet device at the height of the air outlet and the horizontal plane is determined based on the horizontal distance between the first boundary point and the second boundary point in the horizontal direction and the vertical distance between the first boundary point and the second boundary point in the vertical direction. In the horizontal direction, the horizontal distance between the inner edge and the second boundary point is L1, and in the vertical direction, the vertical distance between the inner edge and the second boundary point is H1. The angle α1 = arctan(H1 / L1). In the horizontal direction, the horizontal distance between the outer edge and the first boundary point is L4; in the vertical direction, the vertical distance between the outer edge and the first boundary point is H4; and the angle α4 = arctan(H4 / L4), wherein the angle α is controlled to be α4 ≤ α ≤ α1. Alternatively, in the horizontal direction, the horizontal distance between the outer edge and the second boundary point is L3; in the vertical direction, the vertical distance between the outer edge and the second boundary point is H3; and the angle α3 = arctan(H3 / L3). In the horizontal direction, the horizontal distance between the inner edge and the first boundary point is L2; ​​in the vertical direction, the vertical distance between the inner edge and the first boundary point is H2; and the angle α2 = arctan(H2 / L2), wherein the angle α is controlled to be between α2 and α3. The airflow travels along a path that covers at least part or all of the target area.

2. The pollutant control system as described in claim 1, characterized in that, The system includes multiple air outlets and multiple target areas, wherein the multiple air outlets are included in one or more air outlet devices, and each of the multiple air outlets corresponds to one of the multiple target areas.

3. The pollutant control system as described in claim 1, characterized in that, The pollutant control system further includes an air purification device having a filter assembly and a fan assembly. The air purification device is installed inside or outside the target space and is in gas communication with the return air device and the outlet air device.

4. The pollutant control system as described in claim 1, characterized in that, An air guide is provided in the air outlet, and the angle θ between the air guide and the top of the target space corresponds to the angle α of the airflow relative to the horizontal plane. The angle θ is controlled between 30° and 95°.

5. The pollutant control system as described in claim 1, characterized in that, The target space includes obstacles that obstruct airflow. The target area is set above the obstacle. In the vertical direction, the vertical distance between the obstacle and the target area is 0-0.6m; The horizontal width of the target area is set between 0.1m and 0.7m. The second boundary point of the target area is close to or aligned with the edge of the obstacle in the horizontal direction. The first boundary point of the target area is located further inside the edge of the obstacle. The horizontal distance between the second boundary point and the edge of the obstacle is within 0.3m.

6. The pollutant control system as described in claim 1, characterized in that, There are pollutant generation sites in the target space, and the pollutant generation sites coincide with the second boundary point of the target area. The horizontal distance between the first boundary point of the target area and the pollutant generation sites is 0.1m-0.7m.

7. The pollutant control system as described in claim 1, characterized in that, One return air unit and two outlet air units are used in a group.

8. The pollutant control system as described in claim 5, characterized in that, A return air device and four outlet air devices are used in a group, wherein the return air device is located directly below the obstacle, and the four outlet air devices are distributed in at least two directions of the return air device.

9. The pollutant control system as described in claim 1, characterized in that, The pollutant control system further includes a control device configured to control an angle α based on the horizontal distance between the first boundary point and the second boundary point in the horizontal direction relative to the air outlet and the vertical distance between the first boundary point and the second boundary point in the vertical direction relative to the air outlet.

10. The pollutant control system as described in claim 1 or 9, characterized in that, The system also includes a human detection sensor for detecting the position of a person; an air guide is provided in the air outlet; the angle between the air guide and the top of the target space is adjusted according to the detected position of the person to ensure that the airflow path covers at least part or all of the target area.

11. A pollutant control system, characterized in that, include: An air outlet device is disposed at the top or upper part of the target space, and the air outlet device has at least one air outlet for sending airflow into the target space; An air guide is installed in the air outlet; A return air device is disposed at the bottom or lower part of the target space and configured to allow air from the target space to flow out of the target space; A contaminant generation site, wherein the contaminant generation site is located within the target space; An obstacle is arranged below the pollutant generation site and has at least one proximal edge adjacent to the pollutant generation site. The air outlet has an outer edge that is horizontally away from the obstacle and an inner edge that is close to the obstacle. A preset distance D is set from the proximal edge. The angle θ between the air guide and the top of the target space is determined based on the position of the air outlet and the near edge of the obstacle. In the horizontal direction, the distance between the inner edge and the proximal edge is La; in the vertical direction, the vertical distance between the inner edge and the proximal edge is Ha; and the angle β1 = arctan(Ha / La). In the horizontal direction, the horizontal distance between the outer edge and the proximal edge is Lb, and in the vertical direction, the vertical distance between the outer edge and the proximal edge is Hb. The angle β2 = arctan[Hb / (Lb+D)], and the angle θ is controlled to be: β2≤θ≤β1; or, in the horizontal direction, the horizontal distance between the outer edge and the proximal edge is Lb, and in the vertical direction, the vertical distance between the outer edge and the proximal edge is Hb. The angle β3 = arctan(Hb / Lb), in the horizontal direction, the horizontal distance between the inner edge and the proximal edge is La, and in the vertical direction, the vertical distance between the inner edge and the proximal edge is Ha. The angle β4 = arctan[Ha / (La+D)], and the angle θ is controlled to be between β3 and β4.

12. The pollutant control system as described in claim 11, characterized in that, The pollutant generation site is located at a height higher than the obstacle within the target space, and the pollutant is dispersed above the obstacle from the pollutant generation site. The pollutant generation site is located above or outside the proximal edge of the obstacle, and the horizontal distance between the pollutant generation site and the obstacle is set within 0.3m. Furthermore, in the vertical direction, the vertical distance between the obstacle and the pollutant generation site is set within the range of 0-0.6m.

13. The pollutant control system as described in claim 11, characterized in that, The preset distance D is between 0.1 and 1 m.

14. An airflow control method, characterized in that, include: An air outlet device is installed at the top or upper part of the target space, and the air outlet device has an air outlet that sends airflow into the target space. The return air device is installed at the bottom or lower part of the target space, configured to allow air from the target space to flow out of the target space; A target region is defined within the target space, such that the target region has a first boundary point far from the air outlet and a second boundary point near the air outlet in the horizontal direction. The air outlet has an outer edge far from the target region and an inner edge near the target region in the horizontal direction. Based on the horizontal distance between the first and second boundary points relative to the air outlet in the horizontal direction and the vertical distance between the first and second boundary points relative to the air outlet in the vertical direction, the airflow angle α provided by the air outlet device at the height position of the air outlet is controlled. In the horizontal direction, the horizontal distance between the inner edge and the second boundary point is L1, and in the vertical direction, the vertical distance between the inner edge and the second boundary point is H1. The angle α1 = arctan(H1 / L1). In the horizontal direction, the horizontal distance between the outer edge and the first boundary point is L4; in the vertical direction, the vertical distance between the outer edge and the first boundary point is H4; and the angle α4 = arctan(H4 / L4), wherein the angle α is controlled to be α4 ≤ α ≤ α1. Alternatively, in the horizontal direction, the horizontal distance between the outer edge and the second boundary point is L3; in the vertical direction, the vertical distance between the outer edge and the second boundary point is H3; and the angle α3 = arctan(H3 / L3). In the horizontal direction, the horizontal distance between the inner edge and the first boundary point is L2; ​​in the vertical direction, the vertical distance between the inner edge and the first boundary point is H2; and the angle α2 = arctan(H2 / L2), wherein the angle α is controlled to be between α2 and α3. The airflow path covers at least part or all of the target area.

15. An air outlet device, comprising: An air guide plate is installed at the air outlet; as well as A stepper motor, wherein the stepper motor causes the airflow control method according to claim 14 to adjust the operating angle of the air guide plate to correspond to multiple different target areas, so that the airflow path covers at least part or all of the target areas.

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