CN115451495A - Adaptive air supply device based on indoor effective guarantee area - Google Patents
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- 230000003044 adaptive effect Effects 0.000 title claims abstract description 21
- 230000000694 effects Effects 0.000 description 19
- 238000007664 blowing Methods 0.000 description 13
- 238000009423 ventilation Methods 0.000 description 7
- 238000004378 air conditioning Methods 0.000 description 6
- 230000029058 respiratory gaseous exchange Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 4
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- 230000008520 organization Effects 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 231100000597 Sick building syndrome Toxicity 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/79—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling the direction of the supplied air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1486—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by bearings, pivots or hinges
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Abstract
The invention provides an adaptive air supply device based on an indoor effective guarantee area, which comprises a fresh air supply outlet and an arc-shaped guide plate, wherein the fresh air supply outlet is formed in the side wall of a room corresponding to the concave side of the arc-shaped guide plate, the arc-shaped guide plate is arranged on the top plate of the room and forms a gap with the top plate of the room, and the ratio of the width of the gap to the width of the fresh air supply outlet is 1.5-2.5.
Description
Technical Field
The invention relates to the technical field of ventilation systems, in particular to an adaptive air supply device based on an indoor effective guarantee area.
Background
With the development of Chinese economy and science and technology, air conditioning and ventilation become important environmental control technical means for guaranteeing healthy and comfortable life and work of people. Air conditioning ventilation has therefore been widely used in office, residential, commercial, and other types of buildings. The air conditioning and ventilating system is responsible for building a healthy and comfortable air environment and protecting the driving of people for life and work. At present, the ventilation of the air conditioner has a plurality of defects, such as sick building syndrome, a blowing feeling and large head and foot temperature difference. The unreasonable ventilation of the air conditioner can cause poor comfort and low working efficiency of personnel, even induce a series of diseases under the long-term influence, and is not beneficial to the health of the personnel.
The air flow pattern is a direct embodiment of the end of the ventilation and air conditioning system, and has a direct and important impact on the thermal comfort of the indoor personnel. At present, traditional large flood irrigation type mixed ventilation airflow organization is generally adopted in office building spaces. Among them, a top-side air blowing method, which is one of typical air blowing methods for mixed air blowing, is common due to the limitation of the height of a building floor. However, in this air supply mode, fresh cold air supplied into the room directly reaches the room side area, and most of other personnel activity areas are in the return air area, so that the problem of uneven cooling and heating of the indoor effective guarantee area (personnel activity area) is significant, and a part of people have a significant blowing feeling.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an adaptive air supply device based on an indoor effective guarantee area, which has the advantages of improving uneven cold and heat of the indoor effective guarantee area and improving the thermal comfort of personnel.
The invention is realized by the following technical scheme: the utility model provides an adaptability air supply arrangement based on indoor effective guarantee district, includes new trend supply-air outlet and arc guide plate, the new trend supply-air outlet set up on the sunken room lateral wall that one side corresponds of arc guide plate, the arc guide plate set up on the room roof and with the room roof between form the gap, the ratio of the width in gap and the width of new trend supply-air outlet is 1.5 ~ 2.5.
Furthermore, the two sides of the arc-shaped guide plate are respectively connected with a rotating shaft, the rotating shafts are connected with a room top plate through connecting rods, and the lengths of the connecting rods are adjustable.
Furthermore, the arc-shaped guide plate is positioned in the central area of the indoor effective guarantee area.
Furthermore, the length of the arc-shaped guide plate is 2-3 times of the length of the fresh air supply outlet.
Furthermore, the arc length of the arc-shaped guide plate is 0.9-1.2 times of the thickness of the air jet reaching the arc-shaped guide plate.
Further, the width of the gap does not exceed the thickness delta of the air jet at the section of the arc-shaped guide plate.
Further, the air jet thickness δ is calculated by the formula:
wherein a, c and k are related to the vertical distance h between the fresh air supply outlet and the top plate of the room and the width b of the fresh air supply outlet, and x * Is the range of the air flow.
Furthermore, a return air inlet is also arranged on the side wall of the room on one side of the fresh air supply outlet, and the return air inlet is positioned at the lower part of the fresh air supply outlet.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an adaptive air supply device based on an indoor effective guarantee area, which is characterized in that an arc-shaped guide plate is additionally arranged on an airflow conveying path under a roof of a room to distribute fresh air and directly feed the fresh air into the indoor lower effective guarantee area, so that the problem of uneven indoor temperature distribution cold and heat is effectively solved, the problem that personnel are in a return air area is improved to a certain extent, the thermal comfort and the air quality of the indoor effective guarantee area are improved, and the adaptive air supply device has practical significance and good application prospect.
The arc-shaped guide plate can perform corresponding horizontal position adjustment according to the moving range of indoor personnel to realize the trend of full-coverage air supply, and the gap width between the arc-shaped guide plate and the roof of a room can be adjusted according to the load requirements of different horizontal control areas through the connecting rod and the rotating shaft, so that the ratio of the guide flow and the permeation air volume of the arc-shaped guide plate is adjusted, different flow distribution effects are realized, and the air parameter requirements of different areas are met.
The invention designs an adaptive air supply device based on an indoor effective guarantee area based on a subarea air supply principle, is used for improving the air conditioning effect and the energy efficiency of an air conditioning system of an office building, and has practical significance and good application prospect.
Drawings
FIG. 1 is a schematic structural diagram of an adaptive air supply device based on an indoor effective guarantee area;
FIG. 2 is a schematic view of an airflow organization of an adaptive air supply device based on an indoor effective guarantee area;
FIG. 3 is a diagram of an adaptive blower mounting arrangement based on an indoor active safety zone;
FIG. 4 is a schematic view of a rotating shaft structure of an adaptive air supply device based on an indoor effective security area;
FIG. 5 is an adaptive air supply speed cloud chart based on an indoor effective guarantee area under orthogonal experimental working conditions;
FIG. 6 is a graph of the results of an orthogonal experiment;
FIG. 7 is a velocity field profile for the conventional top side feed mode (1), the inventive air delivery mode (2);
FIG. 8 is a temperature field profile for a conventional top side feed mode (1), the inventive air delivery mode (2);
fig. 9 is a comparison of air temperature at the ankle y =0.5m (1), sitting breathing zone y =1.1m (2), standing breathing zone y =1.7m (3) height for the conventional top side blowing mode and the blowing mode of the present invention;
fig. 10 is an air age distribution diagram of the top side blowing mode (1) and the air blowing mode (2) of the present invention.
In the drawings: 1-fresh air pipe; 2-fresh air valve; 3-a fresh air processor; 4-blast pipe; 5-air supply valve; 6-a fresh air supply outlet; 7-a flow guide plate; 8-air return inlet; 9-return air pipe; 10-an exhaust valve; 11-an exhaust duct; 12-a return air valve; 13 a rotating shaft; 14 connecting the rods.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1-3, the present invention provides an adaptive air supply device based on indoor effective guarantee area, the top of the room sidewall is provided with a fresh air supply outlet 6, the fresh air supply outlet 6 is connected with the air outlet of an air handling unit 3 through an air supply valve 5 and an air supply pipe 4, the air inlet of the air handling unit 3 is communicated with the air outlet of a fresh air pipe 1; the air inlet of the fresh air pipe 1 is arranged outdoors, the fresh air valve 2 is arranged on the fresh air pipe 1, the arc-shaped guide plate 7 is arranged below a room top plate right opposite to the fresh air supply outlet 6, and a gap is formed between the arc-shaped guide plate 7 and the room top plate.
The room side wall on one side of the fresh air supply opening 6 is provided with a return air inlet 8, the return air inlet 8 is positioned at the lower part of the fresh air supply opening 6, the return air inlet 8 is communicated with the air inlet end of a return air pipe 9, the first air outlet of the return air pipe 9 is communicated with the fresh air pipe 1 through a return air valve 12, and the second air outlet of the return air pipe 9 is communicated with an exhaust pipe through an exhaust valve 10.
Preferably, the arc-shaped guide plate 7 is usually arranged in the central area of an indoor effective security area, the indoor effective security area is a personnel activity area, the central area of the indoor effective security area is the central area of the indoor personnel activity area, and the distribution conditions of different indoor personnel, heat sources, obstacles and the like can be adjusted.
Preferably, as shown in fig. 3 and 4, two sides of the arc-shaped guide plate 7 are respectively connected with a rotating shaft 13, the rotating shaft 13 is connected with a room top plate through a connecting rod 14, the connecting rod 14 is fixed with the room top plate through threaded connection, the length of the connecting rod 14 is adjustable, the arc-shaped guide plate 7 can rotate at any angle through the rotating shafts 13 on the two sides, so that the deflection flow direction after the air flow strikes the arc-shaped guide plate is changed, the arc-shaped guide plate 7 can adjust the gap width between the arc-shaped guide plate 7 and the room top plate through adjusting the length of the connecting rods 14 on the two sides, and therefore, the flow ratio and the air flow direction are changed, and different environmental requirements are met.
Preferably, the length of the arc-shaped guide plate 7 is 2 to 3 times of the length of the fresh air supply opening 6. The arc length of the arc-shaped guide plate 7 is 0.9-1.2 times of the thickness delta of the air jet reaching the arc-shaped guide plate (the thickness of the air jet can be obtained through a characteristic thickness calculation formula before design).
Preferably, the ratio of the width of the gap between the arc-shaped guide plate 7 and the wall to the width of the fresh air supply outlet 6 is 1.5-2.5, the width of the gap can be correspondingly adjusted according to the actual requirement of a target area, but the width of the gap does not exceed the thickness delta of the air jet flow of the supplied air at the section of the guide plate 7 to the maximum extent;
under the condition that air supply parameters are fixed, the ratio of the diversion plate 7 to the permeation air volume is adjusted by adjusting relevant parameters such as the width of a gap between the arc diversion plate 7 and the wall surface, so that different diversion effects are realized, and the parameter requirements of different areas are met.
When the novel air supply device is used, the fresh air supply opening 6 supplies air horizontally, and the air flowing characteristic of the novel air supply opening 6 is different from that of free jet flow and limited non-attached jet flow because the fresh air supply opening is close to a roof of a room. After the air flow is emitted from the air supply outlet, the air flow is limited by the top plate of the room after passing through a small section of free jet flow, so that the jet flow on one side flows along the wall, and other side jet flows are limited and developed. When the air jet reaches the arc-shaped guide plate 7, part of the air flow collides with the arc-shaped guide plate 7 and is deflected downwards to be sent into a personnel activity area, wherein the air quantity is the guide air quantity of the arc-shaped guide plate 7; the other part of the airflow passes through a gap between the arc-shaped guide plate 7 and the top plate of the room and flows forwards, the permeation air quantity of the arc-shaped guide plate 7 is in the position, and the permeated airflow room reaches the side wall and then enters the personnel activity area at one side of the room downwards by attaching the wall; the sum of the permeation air quantity of the arc-shaped guide plate 7 and the guide air quantity of the arc-shaped guide plate 7 is the total entrainment flow of the section of the arc-shaped guide plate 7, the method evaluates the flow dividing effect of the arc-shaped guide plate 7 through a flow ratio q, and the flow ratio q is the ratio of the permeation air quantity of the arc-shaped guide plate 7 to the total entrainment flow of the air supply reaching the section of the arc-shaped guide plate 7.
When in use, outdoor fresh air is mixed with indoor return air through the fresh air pipe 1 and the fresh air valve 2; the mixing ratio of fresh air and return air is adjusted by controlling the opening size of the fresh air valve 2 and the return air valve 12. The mixed air is treated by the air treatment unit 3 and then is delivered into a room through a fresh air delivery port 6 arranged at the top of the room through a delivery pipe 4 and a delivery valve 5; wherein, a part of the air flow impacts an arc-shaped guide plate 7 fixed at the top of the room to be deflected and sent to a personnel activity area; the other part of the air flow passes through a gap between the arc-shaped guide plate 7 and the top of the room to flow forwards, collides with the side wall of the room, deflects and then is sent into a personnel activity area at one side of the room. The air flow speed sent out by the fresh air supply outlet 6 is controlled by adjusting the opening size of the air supply valve 5. The air flow sent into the indoor effective guarantee area takes away heat and pollutants generated by human bodies (or equipment) in the indoor effective guarantee area, so that the heat and the pollutants can be discharged out of the room through the air return opening 8, the air return pipe 9, the exhaust valve 10 and the exhaust pipe 11.
Example 1
As shown in fig. 5 and 6, the invention measures the diversion effect of the arc-shaped deflector 7 by using the ratio of the gap flow between the arc-shaped deflector 7 and the ceiling of the room as an index, the room model of the present case is an office with a size of 5.5m × 3.6m × 3.2m, and the air supply outlet is 0.5m × 0.2m. The gap width y between the arc-shaped guide plate 7 and the roof of the room is selected * Orthogonal experimental design is carried out by taking the air jet thickness delta and the air supply speed u as main influence factors, namely 3 factors.
The air jet thickness δ is calculated as:
wherein a, c and k are related to the vertical distance h between the air outlet and the ceiling of the room and the width b of the air outlet. The ratio of the vertical distance from the center of the fresh air supply outlet 6 to the top of a room to the width of the fresh air supply outlet 6 is 2.a = -0.48, c =0.76, k = -0.69 * Is the range of the air flow.
It can be seen from the above calculation formula that the change of the air jet thickness can be realized by changing the horizontal position of the arc-shaped guide plate 7, so that the horizontal distance from the arc-shaped guide plate 7 to the center of the air supply opening is selected to be 1m, 2m or 3m. The ratio of the width of the gap between the arc-shaped guide plate 7 and the top of the room to the width of the fresh air supply outlet 6 is 1.5, 2 and 2.5, the air supply speed is 2m/s, 2.5m/s and 3m/s, 3 levels of each factor have the following 9 working conditions:
TABLE 1 orthogonal experimental condition table
FIG. 5 is a cloud chart of the shunting effect of different design parameters under 9 working conditions. And (4) processing the simulation results of the 9 test working conditions to obtain the permeation air volume of the arc-shaped guide plate 7 under different working conditions. Meanwhile, numerical calculation analysis is carried out on the working condition without the arc-shaped guide plate 7, and the section entrainment flow of the air supply jet flow at different ranges is obtained. Therefore, the flow ratio q of the arc-shaped baffle 7 provided in the present invention is shown in table 2 below.
TABLE 2 flow ratio
The analysis of variance procedure for the results of the orthogonal experiments is listed in the following table:
TABLE 3 analysis of variance of orthogonal experimental results
Q A ＝U A -P，Q B ＝U B -P，Q C ＝U C -P，Q T ＝W-P
Q E ＝Q T -Q A -Q B -Q C
Table 4 analysis of variance of orthogonal experimental results table
As shown in Table 4, F 5％ (2, 2) =19 wherein F A 、F B More than 19, showing that the factors A (the width of the gap between the arc-shaped guide plate 7 and the top of the room) and B (the horizontal position of the arc-shaped guide plate 7) have obvious influence on the flow ratio, and F C < 19 indicates that the blower speed impact is minimal. Namely, the influence of the width of the gap is the largest, the horizontal position of the arc-shaped guide plate 7 is the next, and the influence of the air supply speed can not be considered.
The height of the guide plate 7 is the embodiment of the air jet thickness delta, and according to the analysis result, the flow rate ratio q and the gap width y are compared * Dimensional analysis of these parameters, air jet thickness δ, flow ratio q is a dimensionless quantity, and it is clear that the relation can be written as q = f (y) * Delta), fitting by using the simulation experiment result to obtain a curve shown in figure 4, namely obtaining the flow ratio q relative to the gap width y * Dependence on the air jet thickness δ:
example 2
The room size of the example was 5.5 m.times.3.6 m.times.3.2 m, and the cold load index was 100W/m 2 The indoor design temperature is 26 ℃, the air supply temperature is 20 ℃, the air supply speed is 3.29m/s, and the top side air supply mode and the air supply mode are respectively adopted for supplying air. Wherein the air supply outlet is 0.5m multiplied by 0.2m in size, the center height is 2.8m, and the air supply outlet is arranged at the upper position of the side wall of the room. The arc guide plate is arranged at a position 2.5m away from the horizontal distance of the air supply outlet, the width of a gap between the arc guide plate 7 and the top of a room is 0.3m, and the arc guide plateThe arc length formula is as follows.
(x-0.5) 2 +(y-8) 2 ＝4
2.44≤x≤2.50，2.30≤y≤2.90
The traditional top side air supply mode is the same as the invention except that no arc-shaped guide plate is arranged.
As can be seen from fig. 7 (1) and 8 (1), in the conventional top side-feeding mode, the cool air is directly fed to the opposite wall of the room along the top of the room and then flows down along the wall into the passenger activity area. In this case, the air temperature of the passenger activity area on the side away from the air supply opening is low and the blowing feeling is generally remarkable, while the air temperature of the passenger activity area on the side close to the air supply/return opening is high and the air flow speed is low. This will cause some people in the room area to feel too cold and some people to feel too hot. Meanwhile, the indoor effective guarantee area (such as a personnel activity area) is basically in the return air area, and the air quality is reduced.
As can be seen by combining fig. 7 (2) and fig. 8 (2), compared with the conventional top side blowing mode, the blowing mode of the present invention can split the blowing jet flow, and the horizontal position and the gap width of the arc-shaped guide plate are adjusted according to the layout of indoor personnel (or equipment), so as to directly blow fresh air into the area near the personnel activity area. The two air supply jet flows can control indoor loads in a partition mode, the horizontal temperature difference of a personnel activity area can be reduced, and the air quality is improved.
As shown in fig. 9 (1), 9 (2) and 9 (3), the air level temperature difference at the ankle y =0.5m, the sitting breathing zone y =1.1m and the standing breathing zone y =1.7m in the conventional top side delivery mode is 1.58 ℃, 1.29 ℃ and 1.26 ℃ respectively. In the air supply mode, the air horizontal temperature difference at y =0.5m, at the sitting breathing zone y =1.1m and at the standing breathing zone y =1.7m is respectively 0.27 ℃, 0.85 ℃ and 1.04 ℃; compared with the traditional top side conveying mode, the reduction is respectively about 63.97%, 33.90% and 17.08%.
As shown in FIGS. 10 (1) and 10 (2), the comparison of the air age shows that the air age at the height of human breath reaches more than 200 in the conventional top side-delivery mode, but the air age at the height can be controlled to be about 160-180 and reduced by 10% -20% by adopting the invention, which means that the air quality of human breath can be effectively improved by adopting the invention, namely, people breathe to more 'fresh' air in the environment.
The comparison shows that the indoor space constructed by the invention has smaller horizontal temperature gradient and stronger comfort. Air supply efflux is shunted through arc guide plate 7, and two strands of air supply efflux flows through different routes and arrives indoor effective guarantee district, can effectively improve the cold and hot uneven problem in indoor personnel's active area, can promote personnel's active area's air quality simultaneously.
Claims (8)
1. The utility model provides an adaptability air supply arrangement based on indoor effective guarantee district, a serial communication port, including new trend supply-air outlet (6) and arc guide plate (7), new trend supply-air outlet (6) are seted up on the room lateral wall that arc guide plate (7) sunken one side corresponds, arc guide plate (7) set up on the room roof and with the room roof between form the gap, the ratio of the width in gap and the width of new trend supply-air outlet (6) is 1.5 ~ 2.5.
2. The adaptive air supply device based on the indoor effective guarantee area is characterized in that two sides of the arc-shaped guide plate (7) are respectively connected with a rotating shaft (13), the rotating shafts (13) are connected with the top plate of a room through connecting rods (14), and the length of the connecting rods (14) is adjustable.
3. The adaptive air supply device based on the indoor effective guarantee area is characterized in that the arc-shaped guide plate (7) is positioned in the central area of the indoor effective guarantee area.
4. The adaptive air supply device based on the indoor effective guarantee area as claimed in claim 1, wherein the length of the arc-shaped guide plate (7) is 2-3 times of the length of the fresh air supply opening (6).
5. The adaptive air supply device based on the indoor effective guarantee area is characterized in that the arc length of the arc-shaped guide plate (7) is 0.9-1.2 times of the thickness of the air jet reaching the arc-shaped guide plate (7).
6. The adaptive air supply device based on the indoor effective guarantee area is characterized in that the width of the gap does not exceed the thickness delta of the air jet at the section of the arc-shaped guide plate (7).
7. The adaptive air supply device based on the indoor effective guarantee area as claimed in claim 5 or 6, wherein the air jet thickness δ is calculated by the formula:
wherein a, c and k are related to the vertical distance h between the fresh air supply outlet (6) and the top plate of the room, the width b of the fresh air supply outlet (6), and x * Is the range of the air flow.
8. The adaptive air supply device based on the indoor effective guarantee area as claimed in claim 1, wherein a return air inlet (8) is further provided on the side wall of the room on the side where the fresh air supply outlet (6) is provided, and the return air inlet (8) is located at the lower part of the fresh air supply outlet (6).
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| CN112178858A (en) * | 2020-10-26 | 2021-01-05 | 西安建筑科技大学 | Dual-purpose attached ventilation air current environment of tie epidemic regulation and control device |
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2022
- 2022-09-19 CN CN202211138119.6A patent/CN115451495A/en active Pending
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| CN211261691U (en) * | 2019-12-27 | 2020-08-14 | 许昌智工机械制造有限公司 | Wind-force water conservancy diversion baffle is used in tobacco leaf stoving room |
| CN112178858A (en) * | 2020-10-26 | 2021-01-05 | 西安建筑科技大学 | Dual-purpose attached ventilation air current environment of tie epidemic regulation and control device |
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