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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- 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
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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 invention relates to a ventilation device, in particular to a bilateral ventilation device for forming air flow organization of an air pool and a control method thereof.
Background
Modern people, after experiencing the hazards of "soot pollution" and "photochemical pollution", are suffering from a third pollution, mainly "indoor air pollution". According to the research of American experts, the indoor air pollution degree is 2-5 times more serious than that of the outdoor air pollution degree, and can even reach 100 times in special cases. The most direct and effective method for improving indoor air pollution and indoor air quality is to improve the circulation of indoor air, accelerate the discharge of indoor polluted air and accelerate the injection of outdoor fresh air. Replacement ventilation is a widely used ventilation form in air conditioning systems today because replacement ventilation allows higher air quality, greater thermal comfort and higher ventilation efficiency in indoor work areas.
In the prior art, a strip seam type ventilation system is commonly used for realizing indoor air supply, an air supply outlet is in a strip seam shape, the length-width ratio can reach 1:50, and the air flow is sent out in a planar mode. The strip-seam type air port of the system is arranged on the side wall, and the delivered surface type air flow is delivered to a working area by the attaching effect of the wall. The strip-seam type surface ventilation system still has some defects during operation, and because the air supply outlet is in a strip-seam type and belongs to flat jet flow, the speed of the axis of the airflow is quickly attenuated, the attachment range is short, and the temperature difference and the speed change are quick; and the range of the indoor working area covered by the air flow of the strip-seam type ventilation system is limited.
Meanwhile, in the air supply mode, an air supply outlet is rectangular, and the quality and the effect of air supply are improved by using an air supply mode that double-sided attached jet flow is formed by the air supply outlet and two side walls at the corner of a wall (patent number: 200710018332.2). However, in the case of the rectangular air outlet, although both side walls are already attached to the rectangular air outlet, the rectangular air outlet has a large contact area with the ambient indoor air as in the case of the slit-type ventilation system described above, and thus the air flow is mixed with the polluted (hot) air in the room earlier, which reduces the air supply quality.
Disclosure of Invention
In view of the above problems or disadvantages of the prior art, it is an object of the present invention to provide a double-sided ventilation apparatus for forming an air flow pattern of an air pool and a method for controlling the same.
In order to achieve the purpose, the invention adopts the following technical scheme:
a ventilation device for forming air flow organization of an air pool comprises two ventilation pipelines vertically arranged at the top of a room and opposite to the corner of the wall or the corner of the same side of the room, wherein the ventilation pipelines are communicated with the room, the cross section of each ventilation pipeline is in a quarter circle shape, and two planes of each ventilation pipeline along the vertical direction are respectively parallel to two walls at the corner of the room where the ventilation pipelines are arranged; the air supply outlet at the top end of the ventilating duct is externally connected with an air supply device;
and the top of the room is also provided with an air exhaust device which is communicated with the room.
Specifically, air supply arrangement includes the blast pipe, the entry end of blast pipe is provided with the new trend blast gate, the end connection first minute pipe and the second minute pipe of blast pipe, all be provided with the blast gate on first minute pipe and the second minute pipe, and the both end is connected respectively two air pipe.
Specifically, the exhaust device comprises an exhaust pipe, and one end of the exhaust pipe is connected with an exhaust outlet at the top of the room.
Furthermore, an air return device is arranged between the air exhaust device and the air supply device.
Furthermore, the air return device comprises an air return pipe, and an adjusting valve is arranged on the air return pipe;
two ends of the return air pipe are respectively connected with an air supply pipe and an exhaust pipe;
the air return device also comprises an exhaust valve arranged at the tail end of the exhaust pipe;
the air return pipe is connected with one end of the exhaust pipe and is arranged between the air outlet and the exhaust valve, and the end of the air supply pipe is connected with one end of the air return pipe connected with the air supply pipe.
Further, install expend with heat and contract with cold layer on the inner wall of air pipe, its inside parcel leads the temperature piece.
Furthermore, a sensor is arranged between the exhaust valve and the exhaust outlet on the return air pipe, the sensor is connected with a controller, and the controller is connected with the regulating valve, the fresh air valve and the temperature guide sheet through leads.
Further, the thermal insulation layer is wrapped outside the thermal expansion and cold contraction layer.
Furthermore, the vertical distance between the intersection line of two planes of the ventilation pipeline in the vertical direction and the vertical line at the corner of the top wall of the room is d, and the ratio of the d to the radius R of the air supply outlet meets the requirement of the air supply outlet
A control method of a double-side ventilation device for forming air flow organization of an air pool specifically comprises the following steps:
the method comprises the following steps: given an initial temperature value of T0The initial fresh air quantity conveyed by the blast pipe is Q1The initial return air quantity conveyed by the return air pipe is Q2The total ventilation amount Q of the ventilation duct is Q1+Q2(ii) a The temperature sensor measures the return air temperature in the exhaust pipe to be T and transmits the information to the controller;
step two: the controller calculates the temperature difference delta T1，ΔT1＝T-T0The controller sends signals to the fresh air valve, the regulating valve and the temperature guide sheet to control the opening degree of the fresh air valve and the regulating valve and the temperature change of the temperature guide sheet, and the specific implementation method is as follows:
the first condition is as follows: keeping the air supply speed of the ventilating duct unchanged
If Δ T1>0, the controller controls the opening degree of the fresh air valve to ensure that the fresh air quantity delivered by the air supply pipe is controlled by Q1Increase to Q1' controlling the adjusting degree of the adjusting valve to ensure that the return air quantity delivered by the return air pipe is controlled by Q2Reduced to Q2' controlling the guide attached to the inner wall of the ventilation ductThe temperature of the temperature sheet is T1Is reduced to T2Change, temperature difference DeltaT2And Δ T2＝T1-T2，Q1′+Q2′>Q, temperature difference Delta T2The thickness of the expansion and contraction layer is L1Is reduced to L2The amount of expansion is Delta L, where Delta L is L1-L2The cross section area of the ventilating duct is increased from A to A';
wherein,
ΔT1＝αΔT2＝βΔL(1)
in the formula, the linear coefficients alpha and beta are constants;
if Δ T1<0, the controller controls the opening degree of the fresh air valve to ensure that the fresh air quantity delivered by the air supply pipe is controlled by Q1Reduced to Q1' controlling the adjusting degree of the adjusting valve to ensure that the return air quantity delivered by the return air pipe is controlled by Q2Increase to Q2' controlling the temperature of the temperature-guiding sheet attached to the inner wall of the ventilating duct from T1Increase to T2Change, temperature difference DeltaT2And Δ T2＝T2-T1，Q1′+Q2′<Q, change in temperature difference DeltaT2The thickness of the expansion and contraction layer is L1Increase to L2The amount of expansion is Delta L, where Delta L is L2-L1The cross section area of the ventilating duct is reduced from A to A';
case two: air supply speed change of ventilation duct
If Δ T1>0, if the air supply speed of the air duct needs to be increased, the controller controls the opening degree of the fresh air valve to enable the fresh air quantity conveyed by the air supply pipe to be changed from Q1Increase to Q1' controlling the adjusting degree of the adjusting valve to ensure that the return air quantity delivered by the return air pipe is controlled by Q2Reduced to Q2', and Q1′+Q2′>Q; the temperature of the temperature conducting sheet is kept unchanged; or the controller controls the temperature of the temperature-conducting sheet to increase independently, and the temperature of the temperature-conducting sheet is controlled by T1Increase to T2Temperature difference of delta T2And Δ T2＝T2-T1Delta T of varying temperature difference2The thickness of the expansion and contraction layer is L1Increase to L2The amount of expansion is Δ L (Δ L ═ L)2-L1) The cross section area of the ventilating duct is reduced from A to A';
if Δ T1<0, if the air supply speed of the air duct needs to be reduced, the controller controls the opening degree of the fresh air valve to enable the fresh air quantity conveyed by the air supply pipe to be changed from Q1Is reduced to Q1' controlling the adjusting degree of the adjusting valve to make the valve returnThe return air quantity delivered by the air pipe is Q2Increase to Q2', and Q1′+Q2′<Q; the temperature of the temperature conducting sheet is kept unchanged; or the controller controls the temperature of the temperature-conducting sheet to be reduced independently, and the temperature of the temperature-conducting sheet is controlled by T1Is reduced to T2Temperature difference of delta T2And Δ T2＝T1-T2Delta T of varying temperature difference2The thickness of the expansion and contraction layer is L1Is reduced to L2The amount of expansion is Δ L (Δ L ═ L)1-L2) The cross-sectional area of the ventilation duct is increased from A to A'.
Compared with the prior art, the invention has the following technical effects:
1. the ventilating duct is provided with a quarter-circle cross section, is arranged at the top of a room and opposite to the corner or the same side corner, and forms a double-sided attached jet flow air supply mode by utilizing the air supply outlet and the two side walls of the corner to form a column type air supply airflow attached to the wall, so that the entrainment of the air supply airflow to the indoor air is reduced, the mixing amount of the air supply airflow and the indoor polluted air or hot air is reduced before the air supply airflow is attached to and sent to a working area along the side wall, and the quality of the air supply air is improved; after the column type air supply airflow reaches the corner of the bottom of a room, impact jet flow formed by the column type air supply airflow strikes a bottom plate, the impact jet flow is spread on the bottom plate along the sector radial direction, the formed cold air pool has a wider coverage area, and the air supply airflow acts on the whole working area to the maximum extent, so that the freshness of the air in all working areas is ensured, and the air quality and the temperature and humidity of the working area meet the requirement of comfort.
2. The air supply device is arranged at the wall corner at the top of the room, does not occupy the lower space of the room, and is simple and convenient to arrange.
3. The air return device is arranged to convey air in the exhaust pipe to the air supply pipe, mix with fresh air and convey the air to the ventilation pipeline again, so that the air return device can be reused and energy is saved.
4. Set up expend with heat and contract with cold layer in the air pipe, its inside parcel leads the temperature piece, expend with heat and contract with cold layer can expand with heat and contract with cold along with the temperature variation of leading the temperature piece to make air pipe's pipeline internal diameter change, the volume that the control air supply air current got into the workspace, make temperature and humidity in the room suitable.
5. The control method of the bilateral ventilation device for forming the air pool and forming the air flow organization of the air pool conveniently and effectively controls the mixing proportion of fresh air and return air and the pipe diameter of the ventilation pipeline according to the temperature of the exhaust pipe, so that the temperature and the humidity of a human body in a room are suitable.
Drawings
Fig. 1 is a schematic structural view of the present invention, fig. 1(a1) is a schematic structural view of a ventilation duct installed at a corner of an opposite side, and fig. 1(a2) is a schematic structural view of a ventilation duct installed at a corner of an identical side;
FIG. 2 is a schematic view of the structure of the ventilation duct;
fig. 3 is a flow chart of indoor air in which ventilation ducts are installed at opposite corners of a side wall;
FIG. 4 is a diagonal velocity cloud chart of the room when the air supply speed is 1m/s in the experiment;
fig. 5 is a cloud of air temperature distributions at different cross-sections in a laboratory, fig. 5(a1) is a cloud of air temperature distributions at x-1, fig. 5(a2) is a cloud of air temperature distributions at x-1, fig. 5(b1) is a cloud of air temperature distributions at y-2.5, fig. 5(b2) is a cloud of air temperature distributions at y-2.5, fig. 5(c1) is a cloud of air temperature distributions at z-1.5, and fig. 5(c2) is a cloud of air temperature distributions at z-1.5;
FIG. 6 is a cloud chart of the air supply speed of 2m/s and the diagonal surface speed in the room in the second experiment;
FIG. 7 is a speed cloud chart of a diagonal plane of a room where an opposite side air supply port is located, wherein the air supply speed of the device is 3m/s in experiment III;
FIG. 8 is a flow chart of indoor air with ventilation ducts installed in the same side corners;
the reference numbers in the figures represent: 1-regulating valve, 2-fresh air valve, 3-air processor, 4-blast pipe, 5-lead, 6-blast valve, 7-blast outlet, 8-ventilating duct, 9-exhaust outlet, 10-exhaust pipe, 11-sensor, 12-controller, 13-exhaust valve, 14-heat conducting sheet, 15-expansion and contraction layer, 16-heat insulating layer, 17-air return pipe.
The invention will be explained and explained in more detail below with reference to the drawings and exemplary embodiments.
Detailed Description
According to the technical scheme, referring to fig. 1, the bilateral ventilation device for forming the air flow organization of the air pool comprises a ventilation pipeline 8 vertically installed at the opposite side wall corner or the same side wall corner of a room, wherein the ventilation pipeline 8 is communicated with the room, the cross section of the ventilation pipeline 8 is in a quarter circle shape, and two planes of the ventilation pipeline 8 in the vertical direction are respectively parallel to two walls at the wall corner of the room where the ventilation pipeline is installed; the air supply outlet 7 at the top end of the ventilating duct 8 is externally connected with an air supply device; and the top of the room is also provided with an air exhaust device which is communicated with the room.
The air supply device is arranged at the upper part of the room, does not occupy the lower space of the room, and is simple and convenient to arrange. The cross section of the ventilating duct 8 is in a quarter circle shape, the ventilating duct 8 is in a quarter cylinder shape, a double-sided attached jet air supply mode is formed by utilizing an air supply outlet and two side walls of a corner, so that a column type air supply airflow attached to the wall is formed, the column type air supply airflow reaches the floor of a room, after impact jet flow formed by the column type air supply airflow impacts a bottom plate, the impact jet flow is diffused on the bottom plate along the sector radial direction, the coverage area of a formed cold air pool is wide, the air supply airflow acts on the whole working area to the maximum extent, and therefore the freshness of air in all working areas is guaranteed, and the air quality and the temperature and humidity of.
The airflow velocity in any direction can be decomposed into velocity stacks in the x direction, the y direction and the z direction which are different in size according to the vector principle. Namely:
the air blowing ports 7 formed by the two ventilation pipelines 8 respectively send airflow DS1 and DS2, and the air blowing speeds after the two ventilation pipelines hit the floor are respectively as follows:
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
the wind speed DS1 and DS2 are superposed as follows:
DS3(x,y,z)＝[u1(x)+u2(x)]i+[v1(y)+v2(y)]j+[w1(z)+w2(z)]k
wherein u (x) is the component velocity of DS in the x direction, u1(x) is the component velocity of DS1 in the x direction, and u2(x) is the component velocity of DS2 in the x direction; v (y) is the component velocity of DS in the y direction, v1(y) is the component velocity of DS1 in the y direction, and v2(y) is the component velocity of DS2 in the y direction; w (z) is the component velocity of DS in the z direction, w1(z) is the component velocity of DS1 in the z direction, and w2(z) is the component velocity of DS2 in the z direction;
i. j, k are three pairwise perpendicular unit vectors in space.
When two ventilation ducts 8 are installed at the opposite side corner of a room, airflow reaches the floor corner of the room and spreads in a fan shape along the floor, and the formed airflow DS1 and DS2 with two different inflow directions collide with each other along the floor, so that the speeds in the x direction and the y direction are superposed with each other, and meanwhile, the speed in the z direction is strengthened due to the action of thermal buoyancy of the floor, and finally, the airflow speed is formed as follows:
DS3(x,y,z)＝[u1(x)+u2(x)]i+[v1(y)+v2(y)]j+[w1(z)+w2(z)]k
when the two ventilation pipelines 8 are arranged at the same side wall corner of a room, airflow reaches the floor wall corner of the room and is diffused in a fan shape along the floor, the formed airflow DS1 and DS2 with two different inflow directions collide along the floor, so that the speed in the x direction is mutually counteracted, the speed in the y direction is enhanced, the speed in the z direction is enhanced due to the thermal buoyancy of the floor, and finally, the airflow speed is formed 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
The device of the invention utilizes the double-sided attached jet effect and the speed superposition principle to directly send wind to the working area, thereby effectively reducing the air temperature of the indoor working area and achieving the effect of energy conservation.
The ventilating duct 8 is arranged above the ceiling of the room and is positioned at the position of the top of the room to the side wall corner or the same side wall corner; the vertical distance between the intersection line of two planes of the ventilating duct 8 in the vertical direction and the vertical line at the wall corner at the top of the room is d, and the ratio of the d to the radius R of the air supply opening 7 meets the requirementThe air flow sent out by the ventilation pipeline 8 can form jet flow attached to the side wall, the mixing amount of the air flow and indoor polluted air or hot air is further reduced, and the quality of supplied air is improved.
The airflow is sent out from the ventilation pipeline 8 to form jet flow, because the bottom surface of the ventilation pipeline 8 is close enough to the side wall, the airflows sent out at the two sides close to the side wall and far away from the side wall respectively have entrainment effect on the air of the surrounding environment, the air quality of entrainment of the airflows is unequal, and the air quality of entrainment of the airflows at the side far away from the side wall is more than that of entrainment of the airflows at the side close to the side wall; because the energy transferred to the environments at two sides by the turbulent mixing action on the boundary of the jet flow is basically equal, the entrainment speed of the air flow far away from one side of the side wall is low, and the entrainment speed of the air flow close to one side of the side wall is high, so that the pressure of the air flow close to one side of the side wall is low, the jet flow deflects to one side close to the side wall, the entrainment speed of the air flow close to one side of the side wall is higher, the pressure is lower, and the jet flow continuously deflects to the side wall until the jet flow is. When d is increased, the quality of the air in the surrounding environment influenced by the entrainment effect on the two sides of the sent air flow is gradually equal in the same time, and no pressure difference is formed on the two sides of the air flow, so that the air flow cannot be attachedAttaching to side wall, and selecting after test verification <math><mrow>
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The selection of air pipe 8's height considers that it can form stable quarter cylindrical air current, and through experimental analysis, its height should be greater than 100mm to avoid the air current of air supply outlet send out of air pipe 8 bottom to take place to spread around, aggravate the emergence of the air current disorder condition. Meanwhile, from the viewpoint of installation of equipment and beauty, the height of the ventilation duct 8 should not exceed the height from the ceiling to the roof.
The selection of the radius of the quarter-circle cross section of the ventilation pipeline 8 is calculated according to the air output Q and the air outlet speed V of the air outlets, and because two air outlets are arranged on the side air supply system and the same side air supply system of a user, the calculation formula is as follows:
specifically, air supply arrangement includes blast pipe 4, fresh air valve 2 and blast valve 6 have set gradually along the wind direction on blast pipe 4, the entry end of blast pipe 4 is provided with fresh air valve 2, the first minute pipe of end connection and the second minute pipe of blast pipe 4, all be provided with blast valve 6 on first minute pipe and the second minute pipe, and the end of the two is connected respectively two air pipe 8. Further, an air handler 3 is provided on the blast pipe 4. The air processor 3 can select a combined metal hanging type air processor unit with the model of ZKJ6-DT and the rated air quantity of 6000m3/h。
Specifically, the exhaust device comprises an exhaust duct 10, and one end of the exhaust duct 10 is connected with an exhaust outlet 9 at the top of the room.
The blast pipe 4 is used for conveying fresh air into the ventilation pipeline 8, the blast airflow formed by the ventilation pipeline 8 enters a working area, heat and polluted gas generated by a human body and heating equipment are taken away, and the heat and the polluted gas are exhausted outdoors through the exhaust device.
The fresh air valve 2 is used for adjusting the amount of fresh air entering the ventilation pipeline 8; the air processor 3 is used for purifying fresh air entering the ventilation pipeline 8;
the air supply valve 6 can be flexibly adjusted according to the requirement on the air supply speed, and the indoor temperature and humidity are ensured to be proper. Tests prove that when the air supply speed of the air supply outlet 7 is less than 0.5m/s, the columnar air supply airflow formed by the device disclosed by the invention is poor in side wall attaching effect, and cannot form required impact airflow with the floor of a room; when the air flow of the air supply opening 7 is larger than 3m/s, indoor personnel can generate 'blowing feeling', so the air supply speed controlled by the air supply valve 6 is in the range of 0.5-3 m/s.
Furthermore, an air return device is arranged between the air exhaust device and the air supply device.
The device can effectively improve the quality of indoor air, has obvious indoor cooling effect, ensures that the indoor air discharged by the air outlet 9 is low, and is provided with the air return device for conveying the air in the exhaust pipe 10 to the air supply pipe 4, mixing the air with fresh air and conveying the mixed air to the ventilation pipeline 8 again so as to be recycled and save energy sources in order to avoid the waste of cold air.
Specifically, the air return device comprises an air return pipe 17, and the air return pipe 17 is provided with an adjusting valve 1; two ends of the return air pipe 17 are respectively connected with the air supply pipe 4 and the exhaust pipe 10; the air return device also comprises an exhaust valve 13 arranged at the tail end of the exhaust pipe 10; the one end that return air pipe 17 and exhaust pipe 10 are connected is installed between air exit 9 and exhaust valve 13, the one end that return air pipe 17 and blast pipe 4 are connected is installed between air handler 3 and new trend valve 2.
The fresh air valve 2, the regulating valve 1 and the exhaust valve 13 are used for controlling the mixing proportion of fresh air and return air, so that the indoor proper temperature and humidity are guaranteed, and meanwhile, the energy is effectively saved.
Further, the inner wall of the ventilation duct 8 is provided with a thermal expansion and cold contraction layer 15, and the inside of the ventilation duct is wrapped with a heat conduction sheet 14. Further, the thermal expansion and contraction layer 15 is externally wrapped by a thermal insulation layer 16.
The expansion with heat and contraction with cold layer 15 can expand with heat and contract with cold along with the temperature change of the temperature-conducting sheet 14, so that the inner diameter of the pipeline of the ventilation pipeline 8 changes, and the amount of the air supply airflow entering the working area is controlled. The expansion and contraction layer 15 is made of flexible composite materials with large deformation range, high bearing capacity and good fatigue resistance. The heat conducting sheet 14 is made of copper.
The thermal insulation layer 16 is used to prevent the temperature change of the thermal conductive sheet 14 from causing the parameter change of the supply air flow in the ventilation duct 8.
Further, a sensor 11 is arranged between the exhaust valve 13 and the exhaust outlet 9 on the return air pipe 10, the sensor 11 is connected with a controller 12, and the controller 12 is connected with the regulating valve 1, the fresh air valve 2 and the temperature guide sheet 14 through wires 5.
The sensor 11 can adopt a temperature sensor or CO2A sensor for monitoring the flow of hot gases, the CO2The sensor is used for monitoring the polluted gas. The sensor 11 transmits the measured signal to the controller 12, and the controller 12 controls the opening degree of the regulating valve 1 and the fresh air valve 2 and controls the mixing ratio of fresh air and return air; and simultaneously controlling the temperature variation of the temperature-guiding sheet 14, thereby adjusting the expansion and contraction amount of the thermal expansion and contraction layer 15.
A control method of a double-side ventilation device for forming air flow organization of an air pool is disclosed, wherein a sensor 11 adopts a temperature sensor, and the specific control method comprises the following steps:
the method comprises the following steps: given an initial temperature value of T0The initial fresh air quantity delivered by the blast pipe 4 is Q1The initial return air quantity delivered by the return air pipe 10 is Q2The total ventilation amount Q of the ventilation duct is Q1+Q2(ii) a The temperature sensor measures the return air in the exhaust pipe 10Temperature T (T ≠ T)0) And transmits the above information to the controller 12;
step two: controller 12 calculates the temperature difference Δ T1(ΔT1＝T-T0) The controller 12 sends a signal to the fresh air valve 2, the regulating valve 1 and the temperature guide sheet 14 to control the opening degree of the fresh air valve 2 and the regulating valve 1 and the temperature change of the temperature guide sheet 14, and the specific implementation method is as follows:
the first condition is as follows: keeping the blowing speed of the ventilation duct 8 constant
If Δ T1>0, the controller 12 controls the opening degree of the fresh air valve 2 to ensure that the fresh air quantity delivered by the blast pipe is Q1Increase to Q1' controlling the adjusting degree of the adjusting valve 1 to ensure that the return air quantity delivered by the return air pipe 17 is controlled by Q2Reduced to Q2' controlling the temperature of the temperature-guiding sheet 14 attached to the inner wall of the ventilation duct 8 from T1Is reduced to T2Change, temperature difference DeltaT2And Δ T2＝T1-T2，Q1′+Q2′>Q, change in temperature difference DeltaT2The thickness of the expansion and contraction layer 15 is L1Is reduced to L2The amount of expansion is Δ L (Δ L ═ L)1-L2) Which in turn causes the cross-sectional area of the ventilation duct 8 to increase from a to a';
wherein,
ΔT1＝αΔT2＝βΔL(1)
in the formula, the linear coefficients α and β are constant.
If Δ T1<0, the controller 12 controls the opening degree of the fresh air valve 2 to ensure that the fresh air quantity delivered by the blast pipe is Q1Reduced to Q1' controlling the adjusting degree of the adjusting valve 1 to ensure that the return air quantity delivered by the return air pipe 17 is controlled by Q2Increase to Q2' controlling the temperature of the temperature-guiding sheet 14 attached to the inner wall of the ventilation duct 8 from T1Increase to T2Change, temperature difference DeltaT2And Δ T2＝T2-T1，Q1′+Q2′<Q, change in temperature difference DeltaT2The thickness of the expansion and contraction layer 15 is L1Increase to L2The amount of expansion is Δ L (Δ L ═ L)2-L1) Which in turn results in the cross-sectional area of the ventilation duct 8 being reduced from a to a';
(2) air blowing speed change of ventilation duct 8
If Δ T1>0, the blowing speed of the ventilation duct 8 is required to be increased, and the controller 12 controls the opening degree of the fresh air valve 2 to ensure that the fresh air quantity conveyed by the blowing pipe is increasedQ1Increase to Q1' controlling the adjusting degree of the adjusting valve 1 to ensure that the return air quantity delivered by the return air pipe 17 is controlled by Q2Reduced to Q2', and Q1′+Q2′>Q; the temperature of the heat conducting sheet 14 is kept unchanged; or the controller 12 controls the temperature of the temperature-guiding sheet 14 to increase independently, and the temperature of the temperature-guiding sheet 14 is controlled by T1Increase to T2Temperature difference of delta T2And Δ T2＝T2-T1Delta T of varying temperature difference2The thickness of the expansion and contraction layer 15 is L1Increase to L2The amount of expansion is Δ L (Δ L ═ L)2-L1) Which in turn results in a reduction of the cross-sectional area of the ventilation duct 8 from a to a'.
If Δ T1<0, if the blowing speed of the ventilation duct 8 is required to be reduced, the controller 12 controls the opening degree of the fresh air valve 2 to enable the fresh air quantity conveyed by the blowing pipe to be changed from Q1Is reduced to Q1' controlling the adjusting degree of the adjusting valve 1 to ensure that the return air quantity delivered by the return air pipe 17 is controlled by Q2Increase to Q2', and Q1′+Q2′<Q; the temperature of the heat conducting sheet 14 is kept unchanged; or the controller 12 controls the temperature of the temperature-guiding sheet 14 to be reduced independently, and the temperature of the temperature-guiding sheet 14 is controlled by T1Is reduced to T2Temperature difference of delta T2And Δ T2＝T1-T2Delta T of varying temperature difference2The thickness of the expansion and contraction layer 15 is L1Is reduced to L2The amount of expansion is Δ L (Δ L ═ L)1-L2) Which in turn results in an increase of the cross-sectional area of the ventilation duct 8 from a to a'.
Analysis of experiments
Experiment one
The room size is 4000(x) x 5000(y) x 2600(z) (mm) according to the actual situation3) The numerical calculation model of (2) the ventilation pipeline adopts a mode of arranging the corner of the side wall, and the radius of the ventilation pipeline is as follows: 252(mm), the air exit is arranged on the ceiling in the middle of the room top, air exit size: 400X 200 (mm)2) The heat source of the room is simplified into the floor heat flow density of 50w/m2And the rest of the wall is insulated. Temperature of air supplyThe air flow rate was 291K, and the air flow rate was 1 m/s.
In order to verify the air flow organization diffusion condition and the indoor cooling effect of the side air supply device, an average turbulence energy model, namely a standard k-two equation model (standard k-model), is selected to solve an equation set.
Dispersing the control equation by using a finite volume method, wherein a second-order windward format is selected as a discrete format, a SIMPLE algorithm is selected to solve the discrete equation after boundary conditions are introduced, and when the residual values of a speed term and a pressure term are both less than 10-3While the residual values of both temperature and composition are less than 10-6When the indoor air flow condition is obtained, the control equation system converges.
As is apparent from fig. 3, the columnar air flow sent from the air supply opening is attached to the two side wall surfaces of the top wall corner of the room along the side walls, then is sent to the bottom wall corner of the room along the two side walls, and after striking the floor, forms two air pools with different incoming flow directions, and the air flow is uniformly diffused along the floor until contacting and colliding with each other, and finally is discharged from the air outlet. The column type air supply airflow has a very large diffusion range, and under the condition that the air supply speed is 1m/s, the jet flow area of the column type air supply airflow accounts for 100% of the floor of the whole room, namely the air supply airflow completely covers the whole working area. Fig. 4 is a speed cloud chart of a working area of a diagonal plane where two air supply outlets are cut, and it can be seen that the wind speed of the whole working area is about 0.1m/s, and the speed of the jet flow reaching the tail end of the opposite side wall is 0.1 m/s.
As can be seen from FIG. 5, the temperature distribution in the room is very uniform, and the temperature difference between different positions of the same cross section is small. It was calculated that the average value of the section temperature was 299.8K when x was 2m, 299.8K when y was 2.5m, and 299.9K when the supply air temperature was 291K, and the average values of the other section temperatures were as shown in table 1. As can be seen from Table 1, the temperature change of different sections is very small, and the maximum temperature difference of different sections is 0.1K. Therefore, the temperature of the whole room supplied by the column type ventilation air-conditioning system is uniform.
TABLE 1 average comparison (K) of temperatures at different cross-sections of different blowing speeds in the opposite-side blowing mode
Experiment two
Under the same condition as the experimental condition, the air supply speed is changed to be 2m/s, the air speed of the working area is about 0.2m/s, the air supply amount is increased, and the freshness of indoor air is improved, meanwhile, due to the increase of the air supply speed, the speed of the jet flow reaching the tail end of the opposite side wall is 0.2m/s, the jet flow distance is farther, and the air supply efficiency of the column type air supply device is improved, and the air supply efficiency is shown in fig. 6. When the blowing speed was 2m/s, the average value of the respective sectional temperatures was shown in Table 1. As can be seen from table 1, when v is 2m/s, the average temperature of each cross section in the room is reduced by about 4.8K compared with v being 1m/s, the cooling effect is significant, and the average temperatures of the cross sections are equal, indicating that the temperature distribution in the room is very uniform.
Experiment three
Under the same condition as the experimental condition, the air supply speed is changed to be 3m/s, the air speed of the working area is about 0.25m/s, the air supply amount is increased, and the freshness of indoor air is improved, meanwhile, due to the increase of the air supply speed, the speed of the jet flow reaching the tail end of the opposite side wall is 0.3m/s, the jet flow distance is farther, and the air supply efficiency of the column type air supply device is improved, and the air supply efficiency is shown in fig. 7. When the blowing speed was 3m/s, the average value of the respective sectional temperatures was shown in Table 1. As can be seen from table 1, when v is 3m/s, the average temperature of each cross section in the room is reduced by about 1.4K compared to v of 2m/s, and the temperature reduction effect tends to be reduced. The room temperature distribution is still very uniform at this time.
Experiment four
Under the condition that the experiment condition is the same, the ventilation pipeline adopts a mode of arranging the same side wall corner, and the air supply mode is changed into the same side air supply mode. As is apparent from fig. 8, the columnar air flow sent out from the air supply opening is attached to the two side wall surfaces of the top wall corner of the room along the side walls, then is sent to the wall corner at the bottom end of the room along the two side walls, and impacts the floor to form two air pools with different incoming flow directions, the air flow is uniformly diffused along the floor until the air pools are contacted and collided with each other, so that the advancing air flow in the y direction is formed, and meanwhile, the columnar air flow is finally discharged from the air outlet due to the action of thermal buoyancy of the working. Like the opposite side air supply mode, the air supply airflow at the same side has a very large diffusion range, and the jet flow area of the air supply airflow occupies 100% of the floor of the whole room, namely the air supply airflow completely covers the whole working area. Through calculation, when the air supply speed is 1m/s, the air speed of the working area is about 0.1m/s, when the air supply speed is 2m/s, the air speed of the working area is about 0.2m/s, and when the air supply speed is 3m/s, the air speed of the working area is about 0.3 m/s. The average values of the temperatures of the respective cross sections at different blowing speeds are shown in Table 2. As can be seen from Table 2, the temperature change of different sections is very small, and the maximum temperature difference of different sections is 0.3K. Therefore, the temperature of the whole room supplied by the column type ventilation air-conditioning system is uniform.
TABLE 2 average comparison of temperatures at different cross-sections at different blowing speeds in the same-side blowing mode (K)
In conclusion, it can be seen that when the ventilation pipeline is installed at the wall corner on the same side and the wall corner on the opposite side, the cooling effect of the working area of a room is obvious, and the temperature distribution is relatively uniform. The higher the air supply speed is, the higher the room working area speed is, and meanwhile, the higher the air flow speed at the tail end of the jet flow is, the farther the air supply jet flow distance is, so that the air quality and the thermal comfort of the room are ensured.
Claims (10)
1. The bilateral ventilation device for forming the air flow organization of the air pool is characterized by comprising two ventilation pipelines (8) which are vertically arranged at the top of a room and opposite to the corner or the same side corner, wherein the ventilation pipelines (8) are communicated with the room, the cross section of each ventilation pipeline is in a quarter circle shape, and two planes of each ventilation pipeline (8) along the vertical direction are respectively parallel to two walls at the corner of the room where the ventilation pipeline is arranged; an air supply outlet (7) at the top end of the ventilating duct (8) is externally connected with an air supply device;
and the top of the room is also provided with an air exhaust device which is communicated with the room.
2. The double-sided ventilation device for forming the air flow organization of the air pool according to claim 1, characterized in that the air supply device comprises an air supply pipe (4), the inlet end of the air supply pipe (4) is provided with a fresh air valve (2), the tail end of the air supply pipe (4) is connected with a first branch pipe and a second branch pipe, the first branch pipe and the second branch pipe are both provided with air supply valves (6), and the tail ends of the first branch pipe and the second branch pipe are respectively connected with the two ventilation pipelines (8).
3. The double-sided ventilation device for forming air flow organization of air pool according to claim 2, characterized in that the exhaust device comprises an exhaust duct (10), one end of the exhaust duct (10) is connected with an exhaust outlet (9) at the top of the room.
4. The double-sided ventilation apparatus for forming an air flow pattern of an air pool as claimed in claim 3, wherein an air return means is provided between the air exhaust means and the air supply means.
5. The double-sided ventilation device for forming the air flow structure of the air pool according to claim 4, wherein the air return device comprises a return air pipe (17), and the return air pipe (17) is provided with a regulating valve (1);
two ends of the air return pipe (17) are respectively connected with the air supply pipe (4) and the exhaust pipe (10);
the air return device also comprises an exhaust valve (13) arranged at the tail end of the exhaust pipe (10);
the air return pipe is characterized in that one end of the air return pipe (17) connected with the exhaust pipe (10) is arranged between the exhaust outlet (9) and the exhaust valve (13), and one end of the air return pipe (17) connected with the air supply pipe (4) is connected with the tail end of the air supply pipe (4).
6. The double-sided ventilation device for forming the airflow structure of the air pool according to claim 5, wherein the inner wall of the ventilation duct (8) is provided with a thermal expansion and contraction layer (15), and the thermal conduction sheet (14) is wrapped inside the thermal expansion and contraction layer.
7. The double-sided ventilation device for forming the air flow organization of the air pool according to claim 6, characterized in that a sensor (11) is arranged on the return air pipe (10) between the exhaust valve (13) and the exhaust outlet (9), the sensor (11) is connected with a controller (12), and the controller (12) is connected with the regulating valve (1), the fresh air valve (2) and the temperature guiding sheet (14) through wires (5).
8. The double-sided ventilation apparatus for forming an air flow pattern of an air pool according to claim 6 or 7, wherein the thermal expansion and contraction layer (15) is externally wrapped with a thermal insulation layer (16).
9. The double-sided ventilation device for forming air flow patterns of air pools according to any one of claims 1 to 7, wherein the vertical distance between the intersection line of two planes of the ventilation duct (8) in the vertical direction and the vertical line at the corner of the top wall of the room is d, and the ratio of the d to the radius R of the air supply opening (7) is satisfied
10. A control method of a double-side ventilation device for forming air flow organization of an air pool specifically comprises the following steps:
the method comprises the following steps: given an initial temperature value of T0The initial fresh air quantity conveyed by the blast pipe (4) is Q1The initial return air quantity delivered by the return air pipe (10) is Q2The total ventilation amount Q of the ventilation duct is Q1+Q2(ii) a The temperature sensor measures the return air temperature in the exhaust pipe (10) to be T and transmits the information to the controller (12);
step two: the controller (12) calculates the temperature difference Delta T1，ΔT1＝T-T0The controller (12) sends signals to the fresh air valve (2), the regulating valve (1) and the temperature guide sheet (14) to control the opening degree of the fresh air valve (2) and the regulating valve (1) and the temperature guide sheet (14)The temperature change is realized by the following specific method:
the first condition is as follows: keeping the air supply speed of the ventilation pipeline (8) unchanged
If Δ T1>0, the controller (12) controls the opening degree of the fresh air valve (2) to ensure that the fresh air quantity delivered by the blast pipe is controlled by Q1Increase to Q1' controlling the adjusting degree of the adjusting valve (1) to ensure that the return air quantity delivered by the return air pipe (17) is controlled by Q2Reduced to Q2' controlling the temperature of the temperature-conducting sheet (14) attached to the inner wall of the ventilation duct (8) from T1Is reduced to T2Change, temperature difference DeltaT2And Δ T2＝T1-T2，Q1′+Q2′>Q, temperature difference Delta T2The thickness of the expansion and contraction layer (15) is L1Is reduced to L2The amount of expansion is Delta L, where Delta L is L1-L2The cross section area of the ventilating duct (8) is increased from A to A';
wherein,
ΔT1＝αΔT2＝βΔL(1)
in the formula, the linear coefficients alpha and beta are constants;
if Δ T1<0, the controller (12) controls the opening degree of the fresh air valve (2) to ensure that the fresh air quantity delivered by the blast pipe is controlled by Q1Reduced to Q1' controlling the adjusting degree of the adjusting valve (1) to ensure that the return air quantity delivered by the return air pipe (17) is controlled by Q2Increase to Q2' controlling the temperature of the temperature-conducting sheet (14) attached to the inner wall of the ventilation duct (8) from T1Increase to T2Change, temperature difference DeltaT2And Δ T2＝T2-T1，Q1′+Q2′<Q, change in temperature difference DeltaT2The thickness of the expansion and contraction layer (15) is L1Increase to L2The amount of expansion is Delta L, where Delta L is L2-L1The cross section area of the ventilating duct (8) is reduced from A to A';
case two: air supply speed change of ventilation duct (8)
If Δ T1>0, if the air blowing speed of the ventilation pipeline (8) needs to be increased, the controller (12) controls the opening degree of the fresh air valve (2) to enable the fresh air volume conveyed by the air blowing pipe to be changed from Q1Increase to Q1' controlling the adjusting degree of the adjusting valve (1) to ensure that the return air quantity delivered by the return air pipe (17) is controlled by Q2Reduced to Q2', and Q1′+Q2′>Q; the temperature of the heat conducting sheet (14) is kept unchanged; or the controller (12) controls the temperature of the temperature guide sheet (14) to increase independently, and the temperature of the temperature guide sheet (14) is controlled by T1Increase to T2Temperature difference of delta T2And Δ T2＝T2-T1Delta T of varying temperature difference2The thickness of the expansion and contraction layer (15) is L1Increase to L2The amount of expansion is Δ L (Δ L ═ L)2-L1) The cross section area of the ventilating duct (8) is reduced from A to A';
if Δ T1<0, if the air supply speed of the ventilation pipeline (8) needs to be reduced, the controller (12) controls the opening degree of the fresh air valve (2) to enable the fresh air quantity conveyed by the air supply pipe to be changed from Q1Is reduced to Q1' controlling the adjusting degree of the adjusting valve (1) to ensure that the return air quantity delivered by the return air pipe (17) is controlled by Q2Increase to Q2', and Q1′+Q2′<Q; the temperature of the heat conducting sheet (14) is kept unchanged; or the controller (12) independently controls the temperature of the temperature guide sheet (14) to be reduced, and the temperature of the temperature guide sheet (14) is controlled by T1Is reduced to T2Temperature difference of delta T2And Δ T2＝T1-T2Delta T of varying temperature difference2The thickness of the expansion and contraction layer (15) is L1Is reduced to L2The amount of expansion is Δ L (Δ L ═ L)1-L2) The cross-sectional area of the ventilation duct (8) is increased from A to A'.
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