CN105135585A - Bilateral ventilation device for forming air tank air distribution and control method thereof - Google Patents
Bilateral ventilation device for forming air tank air distribution and control method thereof Download PDFInfo
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- CN105135585A CN105135585A CN201510548195.8A CN201510548195A CN105135585A CN 105135585 A CN105135585 A CN 105135585A CN 201510548195 A CN201510548195 A CN 201510548195A CN 105135585 A CN105135585 A CN 105135585A
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- ventilation shaft
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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
Abstract
The invention discloses a bilateral ventilation device for forming air tank air distribution and a control method thereof. The bilateral ventilation device comprises two ventilating ducts which are vertically mounted on opposite-side wall corners or same-side wall corners on the top of a room, wherein the ventilating ducts communicate with the room; the cross section of each ventilating duct is in the shape of one fourth a circle; two planes, in the vertical direction, of the ventilating ducts are respectively parallel to two walls on the wall corners of the room in which the ventilating ducts are mounted; top-end air-supply outlets of the ventilating ducts are externally connected with air supply devices; and an air exhaust device which communicates with the room is further arranged on the top of the room. According to the bilateral ventilation device disclosed by the invention, mixing amount of air and indoor polluted air or hot air is reduced, and the quality of supplied air is improved; a formed cold air tank is relatively wide in coverage, and the whole working region is acted to the greatest extent by utilizing an air supply mode of forming double-faced wall attachment jet by virtue of the air supply outlets and two side walls on the wall corners, so that the freshness of the air in the whole working region is guaranteed, and the quality and the temperature and humidity of the air in the working region meet comfort requirements.
Description
Technical field
The present invention relates to a kind of ventilation unit, be specifically related to a kind of bilateral ventilation device and the control method thereof that form air pond air current composition.
Background technology
Modern, after the harm that experienced by " smoke pollution " and " photochemical pollution ", suffer from and is polluting based on the third time of " room air pollution ".Show according to US Experts research, more serious than outdoor 2-5 times of the degree of room air pollution, even can reach 100 times under special circumstances.Improve room air pollution, the most effective way improving IAQ is exactly the circulation improving room air, accelerates the discharge of indoor pollution air, accelerates the injection of outdoor fresh air.Because replacement aeration can make office work district obtain higher air quality, higher thermal comfort have higher drafting efficiency, therefore replacement aeration is the ventilation form of comparatively extensive use in air-conditioning system at present.
In prior art, conventional scrak type face formula ventilating system realizes indoor air-supply, and air outlet is gap-shaped, and length-width ratio can reach 1:50, and the air-flow sent is sent in planar mode.This system slip diffuser is arranged on side wall, and the face formula air-flow sent relies on the attaching effect of body of wall to send to workspace.But scrak type face formula ventilating system operationally still exists some defects, because its air outlet is scrak type, belongs to flat jet, air-flow axle center velocity attenuation is fast, attaches range shorter, the temperature difference and velocity variations very fast; And the office work district that scrak type face formula ventilating system air-supply air-flow covers is limited in scope.
Meanwhile, (patent No.: 200710018332.2), in this air supply mode, air outlet is rectangle to Chinese patent, utilizes the two sides side wall in air outlet and corner to form the air supply mode of two-sided wall attachment jet to improve wind pushing air quality and effect.But but have problems in the specific implementation, the air outlet of this invention is rectangle, although it has attached two sides side wall, but under identical air output and air supply velocity, this rectangular air supply opening is the same with above-mentioned scrak type face formula ventilating system, the air-flow sent and ambient room air contact area are comparatively large, air-supply air-flow can be caused comparatively early to mix with indoor pollution (heat) air, reduce air-supply quality.
Summary of the invention
For above-mentioned problems of the prior art or defect, the object of the invention is to, a kind of bilateral ventilation device and the control method thereof that form air pond air current composition are provided.
To achieve these goals, the present invention adopts following technical scheme:
A kind of ventilation unit forming air pond air current composition, comprise two ventilation shafts being vertically arranged on offside corner, top, room or homonymy corner, described ventilation shaft is communicated with room, its cross section is quadrant shape, and ventilation shaft two planes are vertically parallel to two walls at corner, the room place that it is installed respectively; The external air-supply arrangement of described ventilation shaft top air outlet;
Top, described room is also provided with air exhausting device, and described air exhausting device is connected with room.
Particularly, described air-supply arrangement comprises ajutage, and the arrival end of described ajutage is provided with new air-valve, and the end connection first of described ajutage is in charge of and is in charge of with second, described first is in charge of to be in charge of with second and is provided with blow valve, and the end of the two connects described two ventilation shafts respectively.
Particularly, described air exhausting device comprises exhaust duct, the exhaust outlet at the top, connection room, one end of described exhaust duct.
Further, air-returning device is provided with between described air exhausting device and air-supply arrangement.
Further, described air-returning device comprises backwind tube, and described backwind tube is provided with control valve;
The two ends of described backwind tube connect ajutage and exhaust duct respectively;
Described air-returning device also comprises the exhaust valve being arranged on exhaust duct end;
One end that described backwind tube is connected with exhaust duct is arranged between exhaust outlet and exhaust valve, and one end that described backwind tube is connected with ajutage connects the end of ajutage.
Further, the inwall of described ventilation shaft is provided with the layer that expands with heat and contract with cold, its internal package leads warm sheet.
Further, described backwind tube is provided with sensor between exhaust valve and exhaust outlet, described sensor connection control device, described controller is by wire and control valve, new air-valve and lead warm sheet and be all connected.
Further, expand with heat and contract with cold described in a layer outer wrap thermal insulation layer.
Further, the intersection of described ventilation shaft two planes vertically, and the vertical range between the vertical curve at corner, top, described room place is d, the ratio of the radius R of itself and air outlet meets
Form a control method for the bilateral ventilation device of air pond air current composition, specifically comprise the following steps:
Step one: given initial temperature value is T
0, the initial resh air requirement of ajutage conveying is Q
1, the initial return air amount of backwind tube conveying is Q
2, then the ventilation total amount Q=Q of ventilation shaft
1+ Q
2; It is T that temperature sensor records return air temperature in exhaust duct, and above-mentioned information is sent to controller;
Step 2: controller calculating temperature difference △ T
1, Δ T
1=T-T
0, controller sends signal to new air-valve, control valve and lead warm sheet, control new air-valve, control valve opening degree and lead the variations in temperature of warm sheet, its concrete methods of realizing is as follows:
Situation one: keep the air supply velocity of ventilation shaft constant
If △ is T
1>0, then controller controls the opening degree of new air-valve, and the resh air requirement that ajutage is carried is by Q
1increase to Q
1', the regulating degree of control and regulation valve, the return air amount that backwind tube is carried is by Q
2be reduced to Q
2', the temperature leading warm sheet controlling to be attached in ventilation shaft inwall is by T
1be reduced to T
2change, temperature difference △ T
2, and Δ T
2=T
1-T
2, Q
1'+Q
2' >Q, temperature difference △ T
2make to expand with heat and contract with cold layer thickness by L
1be reduced to L
2, stroke is △ L, Δ L=L
1-L
2, the cross-sectional area of ventilation shaft is increased to A ' by A;
Wherein,
ΔT
1＝αΔT
2＝βΔL(1)
In formula, linear coefficient α and β is constant;
If △ is T
1<0, then controller controls the opening degree of new air-valve, and the resh air requirement that ajutage is carried is by Q
1be reduced to Q
1', the regulating degree of control and regulation valve, the return air amount that backwind tube is carried is by Q
2increase to Q
2', the temperature leading warm sheet controlling to be attached in ventilation shaft inwall is by T
1increase to T
2change, temperature difference △ T
2, and Δ T
2=T
2-T
1, Q
1'+Q
2' <Q, change temperature difference △ T
2make to expand with heat and contract with cold layer thickness by L
1increase to L
2, stroke is △ L, Δ L=L
2-L
1, the cross-sectional area of ventilation shaft is reduced to A ' by A;
Situation two: the air supply velocity of ventilation shaft changes
If △ is T
1>0, then if desired the air supply velocity of ventilation shaft becomes large, then controller controls the opening degree of new air-valve, and the resh air requirement that ajutage is carried is by Q
1increase to Q
1', the regulating degree of control and regulation valve, the return air amount that backwind tube is carried is by Q
2be reduced to Q
2', and Q
1'+Q
2' >Q; Lead warm sheet temperature to remain unchanged; Or controller controls separately to lead warm sheet temperature and increases, and leads the temperature of warm sheet by T
1increase to T
2, the temperature difference is △ T
2, and Δ T
2=T
2-T
1, change temperature difference △ T
2make to expand with heat and contract with cold layer thickness by L
1increase to L
2, stroke is △ L (Δ L=L
2-L
1), the cross-sectional area of ventilation shaft is reduced to A ' by A;
If △ is T
1<0, if desired the air supply velocity of ventilation shaft diminishes, then controller controls the opening degree of new air-valve, and the resh air requirement that ajutage is carried is by Q
1be decreased to Q
1', the regulating degree of control and regulation valve, the return air amount that backwind tube is carried is by Q
2increase to Q
2', and Q
1'+Q
2' <Q; Lead warm sheet temperature to remain unchanged; Or controller controls separately to lead warm sheet temperature and reduces, and leads the temperature of warm sheet by T
1be decreased to T
2, the temperature difference is △ T
2, and Δ T
2=T
1-T
2, change temperature difference △ T
2make to expand with heat and contract with cold layer thickness by L
1be decreased to L
2, stroke is △ L (Δ L=L
1-L
2), the cross-sectional area of ventilation shaft is increased to A ' by A.
Compared with prior art, the present invention has following technique effect:
1, the present invention arranges ventilation shaft, its cross section is quadrant shape, be installed on offside corner, top, room or homonymy corner, the two sides side wall in air outlet and corner is utilized to form the air supply mode of two-sided wall attachment jet, formation is affixed on the pillar air-supply air-flow of wall, reduces air-supply air-flow entrainmenting room air, makes before air-supply air-flow delivers to workspace along the attaching of side wall wall, decrease the combined amount of itself and indoor pollution air or hot-air, improve the quality of wind pushing air; Bottom pillar air-supply air-flow arrival room behind corner, after base plate is clashed in its impact jet flow formed, along fan-shaped radial diffusion on base plate, the cold air pond coverage rate formed is wider, air-supply air-flow farthest acts on whole workspace, thus ensure that the freshness of all working region air, make workspace air quality and humiture meet comfortableness requirement.
2, arrange air-supply arrangement, be arranged on corner, top, room, do not take the lower space in room, Plant arrangement is simple and convenient.
3, air-returning device is set, the gas in exhaust duct is transported in ajutage, mix with new wind, be again transported in ventilation shaft, thus recycling, save the energy.
4, in ventilation shaft, the layer that expands with heat and contract with cold is set, its internal package leads warm sheet, the described layer that expands with heat and contract with cold can expand with heat and contract with cold along with the variations in temperature leading warm sheet, thus the internal diameter of the pipeline of ventilation shaft is changed, control the amount that air-supply air-flow enters workspace, the temperature and humidity in room is suitable for.
5, the control method of the bilateral ventilation device of the formation air pond air current composition in formation air pond of the present invention, according to the temperature of exhaust duct, easily and effectively control the mixed proportion of new wind and return air, and the pipe diameter size of ventilation shaft, make the temperature and humidity reaching suitable human body in room.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention, and Fig. 1 (a1) is the structural representation that ventilation shaft is arranged on offside corner, and Fig. 1 (a2) is the structural representation that ventilation shaft is arranged on homonymy corner;
Fig. 2 is ventilation duct structure schematic diagram;
Fig. 3 is the room air motion pattern that ventilation shaft is arranged on offside corner;
Fig. 4 is experiment one air supply velocity when being 1m/s, room inner opposite angle face velocity cloud atlas;
Fig. 5 is experiment one indoor different cross section place air themperature cloud charts, Fig. 5 (a1) is sectional view in x=1 sections, Fig. 5 (a2) is cross section, x=1 place air themperature cloud charts, Fig. 5 (b1) is sectional view in y=2.5 sections, Fig. 5 (b2) is cross section, y=2.5 place air themperature cloud charts, Fig. 5 (c1) is sectional view in z=1.5 sections, and Fig. 5 (c2) is cross section, z=1.5 place air themperature cloud charts;
Fig. 6 is that in experiment two, air supply velocity is 2m/s, room inner opposite angle face velocity cloud atlas;
Fig. 7 adopts apparatus of the present invention air supply velocity to be 3m/s in experiment three, to room, place, Lateral supply air port diagonal plane speed cloud atlas;
Fig. 8 is the room air motion pattern that ventilation shaft is arranged on homonymy corner;
Number in the figure represents: 1-control valve, 2-new air-valve, 3-air processor, 4-ajutage, 5-wire, 6-blow valve, 7-air outlet, 8-ventilation shaft, 9-exhaust outlet, 10-exhaust duct, 11-sensor, 12-controller, 13-exhaust valve, 14-lead warm sheet, 15-expand with heat and contract with cold layer, 16-thermal insulation layer, 17-backwind tube.
Below in conjunction with drawings and Examples, explanation detailed further and explanation are done to the solution of the present invention.
Detailed description of the invention
Defer to technique scheme, see Fig. 1, the bilateral ventilation device of formation air pond of the present invention air current composition, comprise the ventilation shaft 8 being vertically arranged on offside corner, room or homonymy corner, described ventilation shaft 8 is communicated with room, its cross section is quadrant shape, and ventilation shaft 8 two planes are vertically parallel to two walls at corner, the room place that it is installed respectively; The external air-supply arrangement of described ventilation shaft 8 top air outlet 7; Top, described room is also provided with air exhausting device, and described air exhausting device is connected with room.
Air-supply arrangement of the present invention is arranged on top, room, and do not take the lower space in room, Plant arrangement is simple and convenient.Ventilation shaft 8 cross section of the present invention is quadrant shape, ventilation shaft 8 is quadrant cylindricality, the two sides side wall in air outlet and corner is utilized to form the air supply mode of two-sided wall attachment jet, thus form the pillar air-supply air-flow being affixed on wall, pillar air-supply air-flow arrives room floor, after base plate is clashed in its impact jet flow formed, along fan-shaped radial diffusion on base plate, the cold air pond coverage rate formed is wider, air-supply air-flow farthest acts on whole workspace, thus ensure that the freshness of all working region air, workspace air quality and humiture is made to meet comfortableness requirement.
The air velocity in any direction can resolve into according to vector principle the x direction varied in size, the speed superposition in y direction and z direction.That is:
The air outlet 7 that two ventilation shafts 8 are formed, the air-flow sent is respectively DS1 and DS2, and the air supply velocity after the two clashes into floor is respectively:
DS1(x,y,z)＝u1(x)i+v1(y)j+w1(z)k
DS2(x,y,z)＝u2(x)i+v2(y)j+w2(z)k
Wind speed DS1 and DS2 after superposing is:
DS3(x,y,z)＝[u1(x)+u2(x)]i+[v1(y)+v2(y)]j+[w1(z)+w2(z)]k
Wherein, u (x) is for DS is in the component velocity in x direction, and u1 (x) is for DS1 is in the component velocity in x direction, and u2 (x) is for DS2 is in the component velocity in x direction; V (y) is for DS is in the component velocity in y direction, and v1 (y) is for DS1 is in the component velocity in y direction, and v2 (y) is for DS2 is in the component velocity in y direction; W (z) is for DS is in the component velocity in z direction, and w1 (z) is for DS1 is in the component velocity in z direction, and w2 (z) is for DS2 is in the component velocity in z direction;
I, j, k are three, space unit vectors perpendicular to each other.
When two ventilation shafts 8 are arranged on offside corner, room, air-flow arrives room floors corner along floor with fan-shaped diffusion, two differences formed carry out air-flow DS1 and DS2 of flow path direction along collision on the ground, make x direction, the speed in y direction superposes mutually, simultaneously because z direction speed is strengthened in floor heat buoyancy effect, final formation air-flow wind speed is as follows:
DS3(x,y,z)＝[u1(x)+u2(x)]i+[v1(y)+v2(y)]j+[w1(z)+w2(z)]k
When two ventilation shafts 8 are arranged on homonymy corner, room, air-flow arrives room floors corner along floor with fan-shaped diffusion, two differences formed carry out air-flow DS1 and DS2 of flow path direction along collision on the ground, x direction speed is cancelled out each other, y direction speed is strengthened, simultaneously because z direction speed is strengthened in floor heat buoyancy effect, final formation air-flow wind speed is as follows
DS3(x,y,z)＝[u1(x)+u2(x)]i+[v1(y)+v2(y)]j+[w1(z)+w2(z)]k
＝[v1(y)+v2(y)]j+[w1(z)+w2(z)]k
Device of the present invention utilizes above-mentioned two-sided attaching jet action and speed principle of stacking, and wind is directly sent to workspace, effectively can reduce office work district air themperature, reach energy-conservation effect.
Described ventilation shaft 8 is arranged on the top of overhead room, is positioned at the position in offside corner, top, room or homonymy corner; The intersection of described ventilation shaft 8 two planes vertically, and the vertical range between the vertical curve at corner, top, described room place is d, the ratio of the radius R of itself and air outlet 7 meets
the air-flow sent by ventilation shaft 8 can be formed and attach the jet of side wall, further reduce the combined amount of itself and indoor pollution air or hot-air, improve the quality of wind pushing air.
Air-flow sends formation jet from ventilation shaft 8, due to ventilation shaft 8 bottom surface from side wall enough close to, respectively Involving velocity is being produced to the air of its surrounding environment near side wall with away from the air-flow that the both sides of side wall are sent, and the two air quality of entrainmenting is unequal, the air-flow away from side wall side entrainments air quality more than the air quality of entrainmenting near side wall one sidewind; The energy passing to both sides environment by borderline turbulent mixing effect due to jet is substantially equal, so slow away from the air-flow Entrainment Velocity of side wall side, air-flow Entrainment Velocity near side wall side is fast, thus the stream pressure of close side wall side is little, jet deflects near side wall side, and after this faster near side wall one sidewind Entrainment Velocity, pressure is lower, jet continues deflection side wall, forms steady flow until be attached to completely on side wall wall.When d increases, the air-flow both sides sent at one time in the ambient air quality that affects by Involving velocity equal gradually, air-flow both sides just can not mineralization pressure poor, thus air-flow can not be attached on side wall, through verification experimental verification, chooses
The choosing of height of described ventilation shaft 8 considers that it can form stable quadrant columnar airflow, through analysis of experiments, its height should be greater than 100mm, thus the air-flow avoiding the air outlet bottom ventilation shaft 8 to send occurs to spread towards periphery, the generation of aggravation air turbulence situation., install and angle attractive in appearance consideration from equipment, the height of ventilation shaft 8 should not exceed the height of ceiling apart from roof meanwhile.
The choosing of radius of the quadrant shape cross section of described ventilation shaft 8 calculates according to the air-out speed V of air output Q and air outlet, because offside supply air system and person's homonymy supply air system all have two air outlets, therefore computing formula:
Particularly, described air-supply arrangement comprises ajutage 4, described ajutage 4 is disposed with new air-valve 2 and blow valve 6 along wind direction, the arrival end of described ajutage 4 is provided with new air-valve 2, the end connection first of described ajutage 4 is in charge of and is in charge of with second, described first is in charge of to be in charge of with second and is provided with blow valve 6, and the end of the two connects described two ventilation shafts 8 respectively.Further, ajutage 4 is provided with air processor 3.Air processor 3 can select model to be the suspension type air-treatment unit of the combined metal of ZKJ6-DT, nominal air delivery 6000m
3/ h.
Particularly, described air exhausting device comprises exhaust duct 10, the exhaust outlet 9 at the top, connection room, one end of described exhaust duct 10.
Described ajutage 4 is for being transported in ventilation shaft 8 by new wind, and the air-supply air-flow that ventilation shaft 8 is formed enters in workspace, and take away heat and the dusty gas of human body and heat-producing device generation, above-mentioned heat and dusty gas are discharged to outdoor via air exhausting device.
Described new air-valve 2 is for regulating the amount of the new wind entered in ventilation shaft 8; Described air processor 3 is for purifying the new wind entered in ventilation shaft 8;
Described blow valve 6 can regulate flexibly according to the requirement of air supply velocity, ensures that indoor have suitable temperature and humidity.Through verification experimental verification, when the air supply velocity of air outlet 7 is less than 0.5m/s, the pillar air-supply air-flow that apparatus of the present invention are formed attaches the poor effect of sidewall, cannot form required impact air-flow with room floor; When the air-supply air-flow of air outlet 7 is greater than 3m/s, indoor occupant will produce " blowing feeling ", and therefore, the air supply velocity scope that blow valve 6 controls is 0.5 ~ 3m/s.
Further, air-returning device is provided with between described air exhausting device and air-supply arrangement.
Because device of the present invention effectively can improve indoor air quality, to room temperature lowering successful, make the room air of being discharged by exhaust outlet 9 lower, in order to avoid the waste of cold air, air-returning device is set, for being transported in ajutage 4 by the gas in exhaust duct 10, mix with new wind, again be transported in ventilation shaft 8, thus recycling, save the energy.
Particularly, described air-returning device comprises backwind tube 17, and described backwind tube 17 is provided with control valve 1; The two ends of described backwind tube 17 connect ajutage 4 and exhaust duct 10 respectively; Described air-returning device also comprises the exhaust valve 13 being arranged on exhaust duct 10 end; One end that described backwind tube 17 is connected with exhaust duct 10 is arranged between exhaust outlet 9 and exhaust valve 13, and one end that described backwind tube 17 is connected with ajutage 4 is arranged between air processor 3 and new air-valve 2.
Described new air-valve 2, control valve 1 and exhaust valve 13, for controlling the mixed proportion of new wind and return air, make while the indoor preference temperature of guarantee and humidity, effective economize energy.
Further, the inwall of described ventilation shaft 8 is provided with the layer 15 that expands with heat and contract with cold, its internal package leads warm sheet 14.Further, layer 15 outer wrap of expanding with heat and contract with cold described in thermal insulation layer 16.
The described layer 15 that expands with heat and contract with cold can expand with heat and contract with cold along with the variations in temperature leading warm sheet 14, thus the internal diameter of the pipeline of ventilation shaft 8 is changed, and controls the amount that air-supply air-flow enters workspace.The described layer 15 that expands with heat and contract with cold adopts the flexible composite that deformation range is large, bearing capacity is high and anti-fatigue performance is good.Described warm sheet 14 of leading selects copper.
The change of described thermal insulation layer 16 for preventing the variations in temperature leading warm sheet 14 from causing the parameter of the air-supply air-flow in ventilation shaft 8.
Further, described backwind tube 10 is provided with sensor 11 between exhaust valve 13 and exhaust outlet 9, described sensor 11 connection control device 12, described controller 12 is by wire 5 and control valve 1, new air-valve 2 and lead warm sheet 14 and be all connected.
Described sensor 11 can adopt temperature sensor or CO
2sensor, described temperature sensor for monitoring thermal current, described CO
2sensor is used for monitoring pollution gas.The signal transfer control 12 that sensor 11 will record, described controller 12 controls to adjust the opening degree of valve 1 and new air-valve 2, controls the mixed proportion of new wind and return air; Control the temperature variation of leading warm sheet 14 simultaneously, thus the stroke of the layer 15 that expands with heat and contract with cold described in regulating.
Form a control method for the bilateral ventilation device of air pond air current composition, wherein, sensor 11 adopts temperature sensor, and its concrete control method is as follows:
Step one: given initial temperature value is T
0, the initial resh air requirement that ajutage 4 is carried is Q
1, the initial return air amount that backwind tube 10 is carried is Q
2, then the ventilation total amount Q=Q of ventilation shaft
1+ Q
2; It is T (T ≠ T that temperature sensor records return air temperature in exhaust duct 10
0), and above-mentioned information is sent to controller 12;
Step 2: controller 12 calculating temperature difference △ T
1(Δ T
1=T-T
0), controller 12 sends signal to new air-valve 2, control valve 1 and lead warm sheet 14, control new air-valve 2, control valve 1 opening degree and lead the variations in temperature of warm sheet 14, its concrete methods of realizing is as follows:
Situation one: keep the air supply velocity of ventilation shaft 8 constant
If △ is T
1>0, then controller 12 controls the opening degree of new air-valve 2, and the resh air requirement that ajutage is carried is by Q
1increase to Q
1', the regulating degree of control and regulation valve 1, the return air amount that backwind tube 17 is carried is by Q
2be reduced to Q
2', the temperature leading warm sheet 14 controlling to be attached in ventilation shaft 8 inwall is by T
1be reduced to T
2change, temperature difference △ T
2, and Δ T
2=T
1-T
2, Q
1'+Q
2' >Q, change temperature difference △ T
2make to expand with heat and contract with cold layer 15 thickness by L
1be reduced to L
2, stroke is △ L (Δ L=L
1-L
2), and then cause the cross-sectional area of ventilation shaft 8 to be increased to A ' by A;
Wherein,
ΔT
1＝αΔT
2＝βΔL(1)
In formula, linear coefficient α and β is constant.
If △ is T
1<0, then controller 12 controls the opening degree of new air-valve 2, and the resh air requirement that ajutage is carried is by Q
1be reduced to Q
1', the regulating degree of control and regulation valve 1, the return air amount that backwind tube 17 is carried is by Q
2increase to Q
2', the temperature leading warm sheet 14 controlling to be attached in ventilation shaft 8 inwall is by T
1increase to T
2change, temperature difference △ T
2, and Δ T
2=T
2-T
1, Q
1'+Q
2' <Q, change temperature difference △ T
2make to expand with heat and contract with cold layer 15 thickness by L
1increase to L
2, stroke is △ L (Δ L=L
2-L
1), and then cause the cross-sectional area of ventilation shaft 8 to be reduced to A ' by A;
(2) air supply velocity of ventilation shaft 8 changes
If △ is T
1>0, then need the air supply velocity of ventilation shaft 8 to become large, then controller 12 controls the opening degree of new air-valve 2, and the resh air requirement that ajutage is carried is by Q
1increase to Q
1', the regulating degree of control and regulation valve 1, the return air amount that backwind tube 17 is carried is by Q
2be reduced to Q
2', and Q
1'+Q
2' >Q; Lead warm sheet 14 temperature to remain unchanged; Or controller 12 controls separately to lead warm sheet 14 temperature and increases, and leads the temperature of warm sheet 14 by T
1increase to T
2, the temperature difference is △ T
2, and Δ T
2=T
2-T
1, change temperature difference △ T
2make to expand with heat and contract with cold layer 15 thickness by L
1increase to L
2, stroke is △ L (Δ L=L
2-L
1), and then cause the cross-sectional area of ventilation shaft 8 to be reduced to A ' by A.
If △ is T
1<0, if desired the air supply velocity of ventilation shaft 8 diminishes, then controller 12 controls the opening degree of new air-valve 2, and the resh air requirement that ajutage is carried is by Q
1be decreased to Q
1', the regulating degree of control and regulation valve 1, the return air amount that backwind tube 17 is carried is by Q
2increase to Q
2', and Q
1'+Q
2' <Q; Lead warm sheet 14 temperature to remain unchanged; Or controller 12 controls separately to lead warm sheet 14 temperature and reduces, and leads the temperature of warm sheet 14 by T
1be decreased to T
2, the temperature difference is △ T
2, and Δ T
2=T
1-T
2, change temperature difference △ T
2make to expand with heat and contract with cold layer 15 thickness by L
1be decreased to L
2, stroke is △ L (Δ L=L
1-L
2), and then cause the cross-sectional area of ventilation shaft 8 to be increased to A ' by A.
Experimental analysis
Experiment one
Setting up room-sized according to actual conditions is 4000 (x) × 5000 (y) × 2600 (z) (mm
3) mathematical calculation model, the mode that ventilation shaft takes offside corner to arrange, the radius of ventilation shaft: R=252 (mm), exhaust outlet is arranged on the ceiling of room crown center, exhaust outlet size: 400 × 200 (mm
2), it is 50w/m that room thermal source is simplified to floor heat flow density
2, all the other walls are adiabatic.Wind pushing temperature is 291K, and air supply velocity is 1m/s.
In order to verify air current composition spread condition and the room temperature lowering effect of offside air-supply arrangement of the present invention, select average turbulence energy model, i.e. standard k-ε two-equation model (standardk-ε model) solving equation group.
Adopt finite volume method to carry out discrete to above-mentioned governing equation, discrete scheme selects Second-order Up-wind form, selects SIMPLE algorithm to solve discrete equation, when speed term and pressure term residual values are all less than 10 after introducing boundary condition
-3, the residual values of simultaneous temperature and component is all less than 10
-6time, governing equation group restrains, and can obtain indoor air flows situation thus.
Can obviously be found out by Fig. 3, the pillar air-flow that air outlet is sent is attached at corner, top, room two side walls along sidewall, then deliver under two side and reach corner, bottom, room, after clashing into floor, form two and come the different air pond of flow path direction, air-flow evenly spreads along floor until the collision that contacts with each other, and finally discharges from exhaust outlet.Pillar air-supply Diffusion of gas stream scope is very large, and as calculated under air supply velocity is 1m/s situation, its territory, jet face accounts for 100% of whole room floor, and air-flow of namely blowing all covers whole working region.Fig. 4 is the diagonal plane workspace speed cloud atlas at intercepting two air outlet places, can find out that whole workspace wind speed is about 0.1m/s, and the tip speed that jet arrives opposite side wall is 0.1m/s.
As seen from Figure 5, room indoor temperature distribution is very even, and same cross section diverse location temperature contrast is less.As calculated under wind pushing temperature is 291K situation, x=2m section temperature mean value is 299.8K, y=2.5m section temperature mean value is 299.8K, and respiratory region height (z=1.5m) temperature averages is 299.9K, and other section temperature mean values are in table 1.Different cross section variations in temperature is very little as shown in Table 1, and different cross section maximum temperature difference is 0.1K.As can be seen here, the whole room temperature of pillar ventilation and air conditioning system air-supply is more even.
Each section temperature mean value contrast (K) of different air supply velocity under table 1 offside air supply mode
Experiment two
When identical with experiment one condition, change air supply velocity is 2m/s, then workspace wind speed is about 0.2m/s, not only air output increases, and improves room air freshness, simultaneously due to the increase of air supply velocity, the tip speed that jet arrives opposite side wall is 0.2m/s, stream distance is farther, improves the air-supply efficiency of pillar air-supply arrangement of the present invention, see Fig. 6.When air supply velocity is 2m/s, each section temperature mean value is in table 1.As shown in Table 1, as v=2m/s, indoor each cross section mean temperature has reduced about 4.8K than indoor each cross section mean temperature during v=1m/s, and cooling-down effect is obvious, and the mean temperature in each cross section is equal, shows that room indoor temperature distribution is very even.
Experiment three
When identical with experiment one condition, change air supply velocity is 3m/s, then workspace wind speed is about 0.25m/s, not only air output increases, and improves room air freshness, simultaneously due to the increase of air supply velocity, the tip speed that jet arrives opposite side wall is 0.3m/s, stream distance is farther, improves the air-supply efficiency of pillar air-supply arrangement of the present invention, see Fig. 7.When air supply velocity is 3m/s, each section temperature mean value is in table 1.As shown in Table 1, as v=3m/s, indoor each cross section mean temperature has reduced about 1.4K than indoor each cross section mean temperature during v=2m/s, and cooling-down effect trend reduces to some extent.Now room temperature distribution is still very even.
Experiment four
When identical with experiment one condition, the mode that ventilation shaft takes homonymy corner to arrange, changing air supply mode is same Lateral supply.Can obviously be found out by Fig. 8, the pillar air-flow that air outlet is sent is attached at corner, top, room two side walls along sidewall, then deliver under two side and reach corner, bottom, room, after clashing into floor, form two and come the different air pond of flow path direction, air-flow evenly spreads along floor until the collision that contacts with each other, and forms the front inlet air flow in y direction, simultaneously due to workspace heat buoyancy effect, finally discharge from exhaust outlet.The same with offside air supply mode, very large with Lateral supply Diffusion of gas stream scope, its territory, jet face accounts for 100% of whole room floor, and air-flow of namely blowing all covers whole working region.As calculated, when air supply velocity is 1m/s, workspace wind speed is about 0.1m/s, and when air supply velocity is 2m/s, workspace wind speed is about 0.2m/s, and when air supply velocity is 3m/s, workspace wind speed is about 0.3m/s.Under different air supply velocity, each section temperature mean value is in table 2.Different cross section variations in temperature is very little as shown in Table 2, and different cross section maximum temperature difference is 0.3K.As can be seen here, the whole room temperature of pillar ventilation and air conditioning system air-supply is more even.
Each section temperature mean value contrast (K) of different air supply velocity under table 2 homonymy air supply mode
To sum up, can find out, when ventilation shaft is arranged on homonymy corner and offside corner, workspace, room cooling-down effect is obvious, and Temperature Distribution is more even.Air supply velocity is larger, and workspace, room speed is larger, and jet end air velocity is larger simultaneously, and air circulation jet apart from farther, thus ensures space air quality and thermal comfort.
Claims (10)
1. one kind forms the bilateral ventilation device of air pond air current composition, it is characterized in that, comprise two ventilation shafts (8) being vertically arranged on offside corner, top, room or homonymy corner, described ventilation shaft (8) is communicated with room, its cross section is quadrant shape, and ventilation shaft (8) two planes are vertically parallel to two walls at corner, the room place that it is installed respectively; Described ventilation shaft (8) top air outlet (7) external air-supply arrangement;
Top, described room is also provided with air exhausting device, and described air exhausting device is connected with room.
2. the bilateral ventilation device forming air pond air current composition as claimed in claim 1, it is characterized in that, described air-supply arrangement comprises ajutage (4), the arrival end of described ajutage (4) is provided with new air-valve (2), the end connection first of described ajutage (4) is in charge of and is in charge of with second, described first is in charge of to be in charge of with second and is provided with blow valve (6), and the end of the two connects described two ventilation shafts (8) respectively.
3. the bilateral ventilation device forming air pond air current composition as claimed in claim 2, it is characterized in that, described air exhausting device comprises exhaust duct (10), the exhaust outlet (9) at the top, connection room, one end of described exhaust duct (10).
4. the bilateral ventilation device forming air pond air current composition as claimed in claim 3, is characterized in that, be provided with air-returning device between described air exhausting device and air-supply arrangement.
5. the bilateral ventilation device forming air pond air current composition as claimed in claim 4, it is characterized in that, described air-returning device comprises backwind tube (17), described backwind tube (17) is provided with control valve (1);
The two ends of described backwind tube (17) connect ajutage (4) and exhaust duct (10) respectively;
Described air-returning device also comprises the exhaust valve (13) being arranged on exhaust duct (10) end;
One end that described backwind tube (17) is connected with exhaust duct (10) is arranged between exhaust outlet (9) and exhaust valve (13), and one end that described backwind tube (17) is connected with ajutage (4) connects the end of ajutage (4).
6. the bilateral ventilation device forming air pond air current composition as claimed in claim 5, it is characterized in that, the inwall of described ventilation shaft (8) is provided with the layer that expands with heat and contract with cold (15), its internal package leads warm sheet (14).
7. the bilateral ventilation device forming air pond air current composition as claimed in claim 6, it is characterized in that, described backwind tube (10) is positioned between exhaust valve (13) and exhaust outlet (9) and is provided with sensor (11), described sensor (11) connection control device (12), described controller (12) is by wire (5) and control valve (1), new air-valve (2) and lead warm sheet (14) and be all connected.
8. the bilateral ventilation device of formation air pond air current composition as claimed in claims 6 or 7, is characterized in that, described in expand with heat and contract with cold layer (15) outer wrap thermal insulation layer (16).
9. the bilateral ventilation device of the formation air pond air current composition as described in as arbitrary in claim 1 to 7, it is characterized in that, the intersection of described ventilation shaft (8) two planes vertically, and the vertical range between the vertical curve at corner, top, described room place is d, the ratio of the radius R of itself and air outlet (7) meets
10. form a control method for the bilateral ventilation device of air pond air current composition, specifically comprise the following steps:
Step one: given initial temperature value is T
0, the initial resh air requirement that ajutage (4) is carried is Q
1, the initial return air amount that backwind tube (10) is carried is Q
2, then the ventilation total amount Q=Q of ventilation shaft
1+ Q
2; It is T that temperature sensor records exhaust duct (10) interior return air temperature, and above-mentioned information is sent to controller (12);
Step 2: controller (12) calculating temperature difference △ T
1, Δ T
1=T-T
0controller (12) sends signal to new air-valve (2), control valve (1) and lead warm sheet (14), control new air-valve (2), control valve (1) opening degree and lead the variations in temperature of warm sheet (14), its concrete methods of realizing is as follows:
Situation one: keep the air supply velocity of ventilation shaft (8) constant
If △ is T
1>0, then controller (12) controls the opening degree of new air-valve (2), and the resh air requirement that ajutage is carried is by Q
1increase to Q
1', the regulating degree of control and regulation valve (1), makes return air amount that backwind tube (17) is carried by Q
2be reduced to Q
2', the temperature leading warm sheet (14) controlling to be attached in ventilation shaft (8) inwall is by T
1be reduced to T
2change, temperature difference △ T
2, and Δ T
2=T
1-T
2, Q
1'+Q
2' >Q, temperature difference △ T
2make to expand with heat and contract with cold layer (15) thickness by L
1be reduced to L
2, stroke is △ L, Δ L=L
1-L
2, the cross-sectional area of ventilation shaft (8) is increased to A ' by A;
Wherein,
ΔT
1＝αΔT
2＝βΔL(1)
In formula, linear coefficient α and β is constant;
If △ is T
1<0, then controller (12) controls the opening degree of new air-valve (2), and the resh air requirement that ajutage is carried is by Q
1be reduced to Q
1', the regulating degree of control and regulation valve (1), makes return air amount that backwind tube (17) is carried by Q
2increase to Q
2', the temperature leading warm sheet (14) controlling to be attached in ventilation shaft (8) inwall is by T
1increase to T
2change, temperature difference △ T
2, and Δ T
2=T
2-T
1, Q
1'+Q
2' <Q, change temperature difference △ T
2make to expand with heat and contract with cold layer (15) thickness by L
1increase to L
2, stroke is △ L, Δ L=L
2-L
1, the cross-sectional area of ventilation shaft (8) is reduced to A ' by A;
Situation two: the air supply velocity of ventilation shaft (8) changes
If △ is T
1>0, then if desired the air supply velocity of ventilation shaft (8) becomes large, then controller (12) controls the opening degree of new air-valve (2), and the resh air requirement that ajutage is carried is by Q
1increase to Q
1', the regulating degree of control and regulation valve (1), makes return air amount that backwind tube (17) is carried by Q
2be reduced to Q
2', and Q
1'+Q
2' >Q; Lead warm sheet (14) temperature to remain unchanged; Or controller (12) controls separately to lead warm sheet (14) temperature and increases, and leads the temperature of warm sheet (14) by T
1increase to T
2, the temperature difference is △ T
2, and Δ T
2=T
2-T
1, change temperature difference △ T
2make to expand with heat and contract with cold layer (15) thickness by L
1increase to L
2, stroke is △ L (Δ L=L
2-L
1), the cross-sectional area of ventilation shaft (8) is reduced to A ' by A;
If △ is T
1<0, if desired the air supply velocity of ventilation shaft (8) diminishes, then controller (12) controls the opening degree of new air-valve (2), and the resh air requirement that ajutage is carried is by Q
1be decreased to Q
1', the regulating degree of control and regulation valve (1), makes return air amount that backwind tube (17) is carried by Q
2increase to Q
2', and Q
1'+Q
2' <Q; Lead warm sheet (14) temperature to remain unchanged; Or controller (12) controls separately to lead warm sheet (14) temperature and reduces, and leads the temperature of warm sheet (14) by T
1be decreased to T
2, the temperature difference is △ T
2, and Δ T
2=T
1-T
2, change temperature difference △ T
2make to expand with heat and contract with cold layer (15) thickness by L
1be decreased to L
2, stroke is △ L (Δ L=L
1-L
2), the cross-sectional area of ventilation shaft (8) is increased to A ' by A.
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