Fresh air system and control method for multi-story building

Abstract

The present invention discloses a fresh air system for a multi-story building and a control method thereof. The fresh air system for a multi-story building includes a control device, which is arranged at the outdoor air inlet and indoor air outlet of each floor, and a detection device for detecting the indoor air parameters and outdoor air parameters of each floor. The outdoor air inlet of each floor is connected to the indoor air outlet of each floor through a pipe assembly. The control device selects the corresponding outdoor air inlet to supply air to the indoor air outlet of each floor according to a preset control strategy, or the control device selects the outdoor air inlet whose indoor and outdoor air parameters meet preset conditions to supply air to the indoor air outlet of the corresponding floor. The present invention detects the air temperature, humidity and air quality at different heights of the building, matches the fresh air inlet with a fresh air load less than a preset value to introduce fresh air, and then delivers it to the corresponding floors or rooms respectively. This can effectively reduce the workload of the fresh air unit, improve the unit performance, and extend the service life.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh air systems, and in particular to a fresh air system for a multi-story building and a control method thereof. Background Art

[0002] Currently, fresh air systems typically use a single fresh air blower to draw outdoor air into a single room or several rooms on the same floor, with the fresh air inlet located on the corresponding floor. This means that the outdoor air inlet for a fresh air system on the first floor must be located on the first floor, and the outdoor air inlet for a fresh air system on the tenth floor must be located on the tenth floor.

[0003] In high-rise buildings, outdoor air temperature and humidity vary significantly at different heights, leading to significant variations in air quality. For example, the air quality in the dust layer is often poor over time, and the height of the dust layer varies with ambient temperature and humidity. Furthermore, air quality at different heights is affected by seasons and human activity, such as pollen, catkins, and the return of the south wind in spring, smog and sandstorms in winter, as well as construction dust and vehicle exhaust. Furthermore, different floors have different functions, resulting in different indoor fresh air loads. Therefore, the existing setup can overload some fresh air fans, impacting their performance and service life.

[0004] Therefore, how to provide a fresh air system for multi-story buildings that can effectively reduce the workload of fresh air units with heavy loads is a technical problem that needs to be solved urgently in the industry. Summary of the Invention

[0005] In order to solve the technical problem in the prior art that the workload of fresh air units on some floors is heavy, the present invention proposes a fresh air system for multi-story buildings and a control method thereof.

[0006] The fresh air system for a multi-story building proposed in the present invention includes a control device, which is arranged at the outdoor air inlet and indoor air supply outlet of each floor, and a detection device for detecting the indoor air parameters and outdoor air parameters of each floor. The outdoor air inlet of each floor is connected to the indoor air supply outlet of each floor through a pipe assembly. The control device selects the corresponding outdoor air inlet to supply air to the indoor air supply outlet of each floor according to a preset control strategy, or the control device selects the outdoor air inlet whose indoor and outdoor air parameters meet preset conditions to supply air to the indoor air supply outlet of the corresponding floor.

[0007] Furthermore, the preset control strategy includes at least one of an anti-catkins strategy and an anti-dust strategy.

[0008] Furthermore, the indoor and outdoor air parameters include at least one of air quality parameters, temperature parameters, and humidity parameters.

[0009] Furthermore, different types of air parameters have different priorities, and the outdoor air inlets whose indoor and outdoor air parameters meet the preset conditions are screened in order of priority from high to low to supply air to the indoor air inlets of the corresponding layers.

[0010] Furthermore, the pipeline assembly includes:

[0011] Multiple vertical ventilation ducts, each of which is connected to the outdoor air inlet of each floor through the corresponding outdoor fresh air duct and outdoor fresh air valve;

[0012] There are multiple groups of horizontal ventilation ducts, each group of horizontal ventilation ducts is connected to the indoor air supply outlet of each floor, and each horizontal ventilation duct of each group of horizontal ventilation ducts is respectively connected to multiple vertical ventilation ducts through air supply valves.

[0013] Furthermore, the pipeline assembly includes:

[0014] Vertical ventilation ducts, each connected to the outdoor air inlet on each floor through a corresponding outdoor fresh air duct and outdoor fresh air valve;

[0015] The horizontal ventilation duct located on each floor has one end connected to the indoor air supply outlet of each floor, and the other end connected to the vertical ventilation duct through an air supply valve.

[0016] Furthermore, at least one booster fan is connected in series between the indoor air supply outlet of each floor and the transverse ventilation duct, and / or at least one booster fan is provided in the outdoor fresh air duct of each floor.

[0017] Furthermore, at least one booster fan connected in series between the indoor air supply outlet and the horizontal ventilation duct on each floor is arranged in the outdoor vertical fresh air duct shaft, or is arranged indoors.

[0018] Furthermore, the control module turns on the corresponding booster fan according to the air supply distance.

[0019] The control method of the fresh air system of a multi-story building of the above technical solution includes:

[0020] Determine whether the preset control strategy is currently being executed;

[0021] If so, the preset control strategy is executed;

[0022] If not, the indoor and outdoor air parameters are detected, and the air valve of the outdoor air inlet whose air parameters meet the preset conditions is selected to supply air to the indoor air outlet of the corresponding floor.

[0023] Furthermore, the execution of the preset control strategy includes:

[0024] During a specified time period, the air valves of the outdoor air inlets on the pre-set contaminated floors are closed, and the air valves of the outdoor air inlets on other floors are opened to supply air to the indoor air outlets on each floor.

[0025] Further, detecting indoor and outdoor air parameters and selecting the air valve of the outdoor air inlet whose indoor and outdoor air parameters meet the preset conditions to supply air to the indoor air outlet of the corresponding floor specifically includes:

[0026] Get the priority of different types of air parameters of the corresponding layer;

[0027] Detect indoor and outdoor air parameters on each floor;

[0028] Filter out the outdoor air inlets with the highest priority and whose air parameters meet the corresponding preset conditions;

[0029] In descending order of priority, the outdoor air inlets with the next priority level of air parameters meeting the corresponding preset conditions are selected from the selected outdoor air inlets, and this step is repeated until all air parameters are selected;

[0030] Open the air valve of the outdoor air inlet that is finally screened out and supply air to the indoor air outlet of the corresponding floor.

[0031] The present invention improves the piping structure of the fresh air system so that the indoor air supply vents on different floors can adaptively match the outdoor air inlets on the appropriate floors. In a specific example, the present invention detects the air temperature, humidity and air quality at different heights of the building, matches at least one outdoor air inlet with the smallest fresh air load to introduce fresh air, and then delivers it to the corresponding floors or rooms respectively. This can effectively reduce the workload of the fresh air unit, improve the performance of the unit, and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention is described in detail below with reference to the embodiments and accompanying drawings, in which:

[0033] Figure 1 It is a structural diagram of an embodiment of the present invention.

[0034] Figure 2 It is a structural diagram of another embodiment of the present invention.

[0035] Figure 3 This is a control flow chart of an embodiment of the present invention.

[0036] Description of the drawings:

[0037] 1. Fresh air unit; 2. Indoor air supply outlet; 3. Outdoor air inlet; 4. Booster fan; 5. Outdoor fresh air valve; 6. Horizontal ventilation duct; 7. Outdoor fresh air duct; 8. Vertical ventilation duct; 9. Outdoor vertical fresh air duct shaft; 10. Air supply valve. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] Thus, a feature indicated in this specification is intended to illustrate one of the features of one embodiment of the present invention, rather than to imply that every embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other, not explicitly described, combinations. Thus, unless otherwise noted, the described combinations are not intended to be limiting.

[0040] In the description of the invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0041] The fresh air system for a multi-story building proposed in the present invention includes an outdoor air inlet 3, an indoor air outlet 2, a detection device and a control device.

[0042] Each floor of a multi-story building is provided with an outdoor air inlet 3 and an indoor air outlet 2. The present invention does not limit the number of outdoor air inlets 3 and indoor air outlets 2 on each floor. Each floor can be provided with one or more outdoor air inlets 3, and one or more indoor air outlets 2. The outdoor air inlet 3 on each floor is connected to the indoor air outlet 2 on each floor via a duct assembly. At least one fresh air unit 1 is installed on each floor of a multi-story building to supply clean fresh air to the room and to perform heat exchange, dehumidification, and humidification on the indoor and outdoor air. The fresh air unit 1 is equipped with a temperature and humidity sensor to detect the indoor and fresh air outlet temperature of the fresh air unit 1.

[0043] Each floor of a multi-story building is equipped with a detection device, which is divided into indoor and outdoor detection devices. The outdoor detection device can be specifically located near the outdoor air inlet 3 to detect outdoor air parameters near the outdoor air inlet 3. In other words, the detection device on each floor detects the outdoor air parameters of each floor. For example, temperature and humidity sensors and air quality detection devices are located at the outdoor air inlet 3 on each floor to detect outdoor air temperature and humidity at different heights, as well as the concentration of various airborne particles. Indoor detection devices are installed indoors to monitor indoor air quality, air temperature and humidity, etc.

[0044] In one embodiment, the control device opens the damper of the corresponding outdoor air inlet 3 according to a preset control strategy to supply air to the indoor air outlet 2 on each floor. Specifically, the preset control strategy can be a seasonal air pollution prevention strategy, such as an anti-catkins strategy, or a periodic control strategy or a control strategy set according to a human activity plan, such as an anti-dust strategy. In other embodiments, the preset control strategy can also be a conventional control strategy. For example, based on the weather forecast, if the air quality index is good recently, the preset control strategy can be set to a full-open control strategy, that is, the outdoor air inlet 3 on each floor supplies air to the indoor air outlet 2 on the same floor.

[0045] The air parameters include at least one of an air quality parameter, a temperature parameter, and a humidity parameter. In one embodiment, the outdoor air parameters include an outdoor air quality parameter, an outdoor temperature parameter, and an outdoor humidity parameter. Indoor air parameters include an indoor air quality parameter, an indoor temperature parameter, and an indoor humidity parameter. Indoor and outdoor air quality parameters can also be further categorized as needed, such as the concentration of harmful gases such as PM2.5, PM, PM10, and formaldehyde.

[0046] Different air parameters have different priorities, and users can set them accordingly. For example, the temperature parameter prioritizes heat load, while the humidity parameter prioritizes moisture load. When selecting which floors' outdoor air inlets (3) to open their dampers, the control module selects outdoor air inlets (3) whose air parameters meet the preset criteria in descending order of priority. The dampers of these outdoor air inlets (3) are opened, supplying air to the indoor air outlets (2) on the corresponding floors.

[0047] The pipe assembly connecting the outdoor air inlets 3 and the indoor air outlets 2 of each layer can be implemented in a variety of ways. The present invention lists two embodiments of the pipe assembly.

[0048] like Figure 1 As shown, in the first embodiment, the duct assembly of the present invention includes a plurality of vertical ventilation ducts 8 and a plurality of groups of horizontal ventilation ducts 6 .

[0049] The lengths of the multiple vertical ventilation ducts 8 can be adapted to the floor height requirements of a multi-story building. Each vertical ventilation duct 8 is connected to the outdoor air inlet 3 on each floor in a one-to-one correspondence via its corresponding outdoor fresh air duct 7 and outdoor fresh air valve 5. When the control device selects the outdoor air inlet 3 on one floor to supply air to the indoor air supply 2 on all floors, the outdoor fresh air valve 5 corresponding to the outdoor air inlet 3 on that floor is opened, and the outdoor fresh air valves 5 corresponding to the outdoor air inlets 3 on other floors are closed. This allows the outdoor air inlet channel to be limited to a specific outdoor air inlet 3 on a specific floor, and the outdoor fresh air valve 5 on each floor serves as the air valve for the outdoor air inlet 3 on each floor.

[0050] Each floor is provided with a group of transverse ventilation ducts 6, which are connected to the indoor air supply outlets 2 of each floor. Each transverse ventilation duct 6 in each group of transverse ventilation ducts 6 is respectively connected one-to-one with multiple vertical ventilation ducts 8 through air supply valves 10. For example, when there are six floors in total, there are six vertical ventilation ducts 8 and six groups of transverse ventilation ducts 6, and each group is provided with six transverse ventilation ducts 6. The first ventilation duct in each group is connected to the first vertical ventilation duct 8, and an air supply valve 10 is provided at the connection; the second ventilation duct in each group is connected to the second vertical ventilation duct 8, and an air supply valve 10 is provided at the connection; the third ventilation duct in each group is connected to the third vertical ventilation duct 8, and an air supply valve 10 is provided at the connection; the fourth ventilation duct in each group is connected to the fourth vertical ventilation duct 8, and an air supply valve 10 is provided at the connection; the fifth ventilation duct in each group is connected to the fifth vertical ventilation duct 8, and an air supply valve 10 is provided at the connection; the sixth ventilation duct in each group is connected to the sixth vertical ventilation duct 8, and an air supply valve 10 is provided at the connection.

[0051] This first embodiment allows the air parameters of different layers of the present invention to have different priorities. For example, the priority order of the air parameters of the first layer is as follows: air quality parameter > heat load > moisture load. The priority order of the outdoor air parameters of the highest layer is as follows: heat load > moisture load > air quality parameter. Based on the priority of the air parameters of each layer and the preset conditions, the outdoor air inlets 3 connected to the indoor air supply vents 2 of each layer can be selected.

[0052] like Figure 2 As shown, in the second embodiment, the duct assembly of the present invention includes a vertical ventilation duct 8 and a plurality of horizontal ventilation ducts 6.

[0053] The length of the vertical ventilation duct 8 needs to be adapted to the floor height of a multi-story building. The part of the vertical ventilation duct 8 located on each floor is connected to the outdoor air inlet 3 of each floor through the outdoor fresh air duct 7 and outdoor fresh air valve 5 of that floor. When the floor height is six floors, six outdoor fresh air valves 5 are connected in sequence on the vertical ventilation duct 8 at a certain distance, and the six outdoor fresh air valves 5 are located on the first to sixth floors respectively.

[0054] A transverse ventilation duct 6 is provided on each floor. One end of the transverse ventilation duct 6 on each floor is connected to the indoor air supply outlet 2 on each floor, and the other end is connected to the vertical ventilation duct 8 through the air supply valve 10.

[0055] This second embodiment ensures that the outdoor air parameters of different layers of the present invention must have the same priority. For example, the priority order of the air parameters of the first to sixth layers must be consistent. For example, the priority order from high to low is: air quality parameter > heat load > moisture load.

[0056] Since the outdoor air inlet 3 of a certain floor of the present invention needs to supply air to the indoor air outlets 2 of different floors, this will cause some of the outdoor air inlets 3 of the present invention to be far away from the pipes of the indoor air outlets 2 to be delivered. Therefore, the present invention can also set at least one booster fan 4 between the indoor air outlets 2 and the outdoor air inlet 3. For example, at least one booster fan 4 is connected in series between the indoor air outlet 2 and the horizontal ventilation duct 6 of each floor, and / or at least one booster fan 4 is provided in the outdoor fresh air duct 7 of each floor. Furthermore, at least one booster fan 4 connected in series between the indoor air outlet 2 and the horizontal ventilation duct 6 of each floor is set in the outdoor vertical fresh air duct shaft 9, or is set indoors.

[0057] In specific implementation, taking the first embodiment of the above-mentioned duct assembly as an example, a booster fan 4 is provided on each floor, and the booster fan 4 on each floor is arranged in the outdoor vertical fresh air duct shaft 9, located at the front end of the horizontal ventilation duct 6 group, that is, according to the direction of fresh air from the outdoor air inlet 3 to the indoor air outlet 2, the booster fan 4 is located downstream of the horizontal ventilation duct 6 group. Taking the second embodiment of the above-mentioned duct assembly as an example, a booster fan 4 is provided on each floor, and the booster fan 4 on each floor is arranged in the outdoor vertical fresh air duct shaft 9, and is arranged in the horizontal ventilation channel of each floor.

[0058] Based on the setting of the above-mentioned booster fan 4, the control module turns on the corresponding booster fan 4 for boosting according to the air supply distance, avoiding the problem of insufficient wind force in some long-distance pipelines, and ensuring that fresh air can be transported over long distances when the open outdoor fresh air outlet is not on this floor.

[0059] The present invention is based on the above-mentioned fresh air system of the multi-story building and proposes a control method for the above-mentioned fresh air system of the multi-story building.

[0060] like Figure 3 As shown, this control method first determines whether a preset control strategy is currently being executed. If so, the preset control strategy is executed. If no preset control strategy is currently in effect, the indoor and outdoor air parameters are detected, and the outdoor air inlet whose air parameters meet the preset conditions is selected to supply air to the indoor air outlet on the corresponding floor.

[0061] When the preset control strategy is a seasonal air pollution prevention strategy, executing the preset control strategy includes closing the air valves of the outdoor air inlets of the pre-set polluted floors within a specified time period, and opening the air valves of the outdoor air inlets of other floors to supply air to the indoor air outlets of each floor.

[0062] For example, the user can set a date, such as March, for the activation time. They can also set the floors on which the outdoor fresh air valves are closed. Because the height of catkins is generally fixed, these floors can be designated as shielded floors to reduce the filtration burden on fresh air ducts on floors with severe catkin contamination.

[0063] If the preset control strategy is not executed at this time, the specific steps of the control method for detecting indoor and outdoor air parameters and selecting an outdoor air inlet whose air parameters meet the preset conditions to supply air to the indoor air outlet of the corresponding layer are as follows.

[0064] Get the priority of each air parameter of the corresponding layer;

[0065] Detect indoor and outdoor air parameters on each floor;

[0066] Filter out the outdoor air inlets with the highest priority and whose air parameters meet the corresponding preset conditions;

[0067] In descending order of priority, the outdoor air inlets with the next priority level of air parameters meeting the corresponding preset conditions are selected from the selected outdoor air inlets, and this step is repeated until all air parameters are selected;

[0068] Open the air valve of the outdoor air inlet that is finally screened out and supply air to the indoor air outlet of the corresponding floor.

[0069] Taking the first embodiment of the duct assembly as an example, the air parameters of different floors may have different priorities.

[0070] First, set the priority of the outdoor air parameters of a certain floor, for example, set the priority to air quality > heat load > moisture load.

[0071] After the fresh air unit is turned on, it first determines whether the anti-catkins mode is turned on. If it is, the floors where catkins exist are automatically shielded, that is, the outdoor fresh air valves on the corresponding floors are always closed.

[0072] If the catkin release mode is disabled, the fresh air unit on a given floor will default to operating in internal circulation mode (all dampers closed, indoor air circulating) for a time t. During internal circulation mode, both indoor and outdoor air parameters are monitored, and the most suitable outdoor fresh air inlet (floor) is matched based on the set priority order. If the fresh air unit has dehumidification / humidification enabled, humidity is prioritized by default, and other outdoor air parameters are prioritized based on the user-set priority order.

[0073] First, the outdoor air inlets on the top 40% of floors with the best outdoor air quality are screened. Based on the air temperature at these screened outdoor air inlets and the indoor air temperature, the outdoor air inlets on the top 50% of floors with the lowest heat exchange load are calculated. Furthermore, based on the indoor humidity, the outdoor air inlet with the lowest outdoor moisture load is calculated and selected. Alternatively, the outdoor moisture load is calculated based on the indoor humidity and the outdoor air inlets with an outdoor moisture load less than a preset value are selected. Finally, the selected outdoor air inlet is used as the outdoor air inlet for that floor.

[0074] If fresh air is to be delivered to other floors, the above steps can be matched according to the priority order of the air parameters of other floors. In other embodiments, the internal circulation mode can be turned on without turning on the fresh air unit, and the indoor and outdoor air parameters can be directly detected, and then the corresponding outdoor air inlet is selected to deliver fresh air.

[0075] The booster fan of the present invention may also have a gear position. The booster fan is turned on and the gear position is adjusted according to the distance between the indoor and outdoor fresh air ducts (air supply distance) to ensure the air supply volume of the fresh air unit while reducing the load of the fresh air unit.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fresh air system for a multi-story building, comprising a control device, an outdoor air inlet and an indoor air outlet provided at each floor, and a detection device for detecting indoor and outdoor air parameters at each floor, characterized in that: The outdoor air inlet of each floor is connected to the indoor air supply outlet of each floor through a pipe assembly. The control device determines whether a preset control strategy is currently being executed. If so, the corresponding outdoor air inlet is selected according to the preset control strategy to supply air to the indoor air supply outlet of each floor. Otherwise, the control device detects indoor and outdoor air parameters and selects the outdoor air inlet whose indoor and outdoor air parameters meet the preset conditions to supply air to the indoor air supply outlet of the corresponding floor. The execution of the preset control strategy includes: During a specified time period, the air valves of the outdoor air inlets on the pre-set contaminated floors are closed, and the air valves of the outdoor air inlets on other floors are opened to supply air to the indoor air outlets on each floor.

2. The fresh air system for a multi-story building according to claim 1, characterized in that: The preset control strategy includes at least one of an anti-catkins strategy and an anti-dust strategy.

3. The fresh air system for a multi-story building according to claim 1, characterized in that: The indoor and outdoor air parameters include at least one of an air quality parameter, a temperature parameter, and a humidity parameter.

4. The fresh air system for a multi-story building according to claim 3, characterized in that: Different types of air parameters have different priorities. The outdoor air inlets whose indoor and outdoor air parameters meet the preset conditions are screened in order of priority from high to low to supply air to the indoor air inlets of the corresponding layers.

5. The fresh air system for a multi-story building according to claim 1, characterized in that: The pipeline assembly includes: Multiple vertical ventilation ducts, each of which is connected to the outdoor air inlet of each floor through the corresponding outdoor fresh air duct and outdoor fresh air valve; There are multiple groups of horizontal ventilation ducts, each group of horizontal ventilation ducts is connected to the indoor air supply outlet of each floor, and each horizontal ventilation duct of each group of horizontal ventilation ducts is respectively connected to multiple vertical ventilation ducts through air supply valves.

6. The fresh air system for a multi-story building according to claim 1, characterized in that: The pipeline assembly includes: Vertical ventilation ducts, each connected to the outdoor air inlet on each floor through a corresponding outdoor fresh air duct and outdoor fresh air valve; The horizontal ventilation duct located on each floor has one end connected to the indoor air supply outlet of each floor, and the other end connected to the vertical ventilation duct through an air supply valve.

7. The fresh air system for a multi-story building according to claim 5 or 6, characterized in that: At least one booster fan is connected in series between the indoor air supply outlet of each floor and the transverse ventilation duct, and / or at least one booster fan is provided in the outdoor fresh air duct of each floor.

8. The fresh air system for a multi-story building according to claim 7, characterized in that: At least one booster fan connected in series between the indoor air supply outlet and the horizontal ventilation duct on each floor is arranged in the outdoor vertical fresh air duct shaft, or is arranged indoors.

9. The fresh air system for a multi-story building according to claim 7, characterized in that: The control device turns on the corresponding booster fan according to the air supply distance.

10. The method for controlling a fresh air system for a multi-story building according to any one of claims 1 to 9, wherein: Detecting indoor and outdoor air parameters, and selecting the air valve of the outdoor air inlet whose indoor and outdoor air parameters meet the preset conditions to supply air to the indoor air outlet of the corresponding floor specifically includes: Get the priority of different types of air parameters of the corresponding layer; Detect indoor and outdoor air parameters on each floor; Filter out the outdoor air inlets with the highest priority and whose air parameters meet the corresponding preset conditions; In descending order of priority, the outdoor air inlets with the next priority level of air parameters meeting the corresponding preset conditions are selected from the selected outdoor air inlets, and this step is repeated until all air parameters are selected; Open the air valve of the outdoor air inlet that is finally screened out and supply air to the indoor air outlet of the corresponding floor.

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