CN105157155A - Unilateral ventilation device for forming air pool airflow structure and control method thereof - Google Patents

Abstract

The invention discloses a unilateral ventilation device for forming an air pool airflow structure and a control method thereof. The device comprises a ventilation pipe vertically mounted at the top corner of a room, wherein the ventilation pipe is communicated with the room, and the cross section thereof takes the shape of 1/4 circle; two planes of the ventilation pipe in the vertical direction are respectively parallel to two walls at the mounted corner of the room; a wind supply port at the top end of the ventilation pipe is externally connected with a wind supply device; and a wind exhaust device is arranged at the top of the room, and is communicated with the room. The device reduces the mixed quantity with indoor polluted air or hot air, and improves the quality of wind supply air; the coverage of a formed cold air pool is wider; and a double-surface attached jet wind supply mode formed by the wind supply port and two side walls at the wall corner is used for acting on a whole working area to the greatest extent to guarantee the air freshness in all working areas, so that the air quality and the temperature and humidity in the working areas satisfy the comfortable requirements.

Description

A single-side ventilation device for forming air pool airflow organization and its control method

technical field

The invention relates to a ventilation device, in particular to a single-side ventilation device for forming an air pool airflow organization and a control method thereof.

Background technique

After experiencing the hazards of "soot pollution" and "photochemical pollution", modern people are suffering from the third pollution mainly caused by "indoor air pollution". According to research by American experts, the degree of indoor air pollution is 2-5 times worse than that of outdoors, and can even reach 100 times in special cases. To improve indoor air pollution, the most direct and effective way to improve indoor air quality is to improve indoor air circulation, accelerate the discharge of indoor polluted air, and accelerate the injection of outdoor fresh air. Because displacement ventilation can obtain higher air quality, higher thermal comfort and higher ventilation efficiency in indoor working areas, displacement ventilation is currently the most widely used ventilation form in air conditioning systems.

In the prior art, a slit-shaped surface ventilation system is commonly used to realize indoor air supply. The air supply port is slit-shaped, and the aspect ratio can reach 1:50. The airflow sent out is sent out in a planar manner. The slit-type air outlet of this system is installed on the side wall, and the surface airflow sent out is delivered to the work area by the attachment of the wall. However, the slit surface ventilation system still has some defects during operation. Because the air supply port is a slit type, which belongs to a flat jet flow, the axial velocity of the airflow decays quickly, the attachment range is short, and the temperature difference and speed change quickly; and The indoor work area covered by the air supply airflow of the slit type ventilation system is limited.

At the same time, in the Chinese patent (patent number: 200710018332.2), in this air supply mode, the air supply port is rectangular, and the air supply mode is improved by using the air supply port and the two side walls of the corner to form double-sided attached jets to improve the air quality and effect of the air supply. However, there are problems in the specific implementation. The air supply port of the invention is rectangular. Although it has been attached to two side walls, under the same air supply volume and air supply speed, the rectangular air supply port is not compatible with the above-mentioned slit profile. Like the traditional ventilation system, the air flow sent out has a large contact area with the surrounding indoor air, which will cause the air supply air to mix with indoor polluted (hot) air earlier, reducing the quality of the air supply.

Contents of the invention

In view of the above-mentioned problems or defects in the prior art, the object of the present invention is to provide a single-side ventilation device and a control method thereof for forming the airflow organization of the air pool.

In order to achieve the above object, the present invention adopts the following technical solutions:

A ventilation device for forming the airflow organization of the air pool, comprising a ventilation duct installed vertically at the top corner of the room, the ventilation duct communicates with the room, its cross section is a quarter circle, and the ventilation duct is along the vertical direction The two planes are respectively parallel to the two walls at the corner of the room where it is installed; the air supply outlet at the top of the ventilation duct is connected to the air supply device; the top of the room is also provided with an exhaust device, and the exhaust device communicates with the room .

Specifically, the air supply device includes an air supply pipe, on which a fresh air valve and an air supply valve are sequentially arranged along the wind direction, and the end of the air supply pipe is connected to the ventilation duct.

Specifically, the air exhaust device includes an air exhaust pipe, and one end of the air exhaust pipe is connected to an air exhaust port on the top of the room.

Further, an air return device is provided between the exhaust device and the air supply device.

Specifically, the return air device includes a return air pipe, and a regulating valve is arranged on the return air pipe;

Both ends of the air return pipe are respectively connected to the air supply pipe and the air exhaust pipe;

The return air device also includes an exhaust valve arranged at the end of the exhaust pipe;

One end of the air return pipe connected to the exhaust pipe is installed between the air outlet and the exhaust valve, and one end of the air return pipe connected to the air supply pipe is installed between the air supply valve and the fresh air valve.

Further, a thermal expansion and contraction layer is installed on the inner wall of the ventilation duct, and the thermal conduction sheet is wrapped inside.

Further, a sensor is provided on the air return pipe between the exhaust valve and the air outlet, the sensor is connected to a controller, and the controller is connected to the regulating valve, the fresh air valve and the heat guide sheet through wires.

Further, the thermal expansion and contraction layer wraps the heat insulation layer outside.

Further, the vertical distance between the intersection of the two planes along the vertical direction of the ventilation duct and the vertical line at the top corner of the room is d, and the ratio of it to the radius R of the air supply port satisfies $0\≤d/R\≤\sqrt{2}.$

A control method for a single-side ventilation device forming an air pool airflow organization, specifically comprising the following steps:

Step 1: given the initial temperature value T ₀ , the initial fresh air volume delivered by the air supply duct is Q ₁ , and the initial return air volume delivered by the return air duct is Q ₂ , then the total ventilation volume of the ventilation duct is Q=Q ₁ +Q ₂ ; The temperature sensor measures the temperature of the return air in the exhaust pipe as T, and sends the above information to the controller;

Step 2: The controller calculates the temperature difference △T ₁ , ΔT ₁ = TT ₀ , the controller sends a signal to the fresh air valve, the regulating valve and the temperature guide to control the opening degree of the fresh air valve, the regulating valve and the temperature change of the heat guide. The specific implementation method is as follows:

Case 1: Keep the air supply speed of the ventilation duct unchanged

If △T ₁ >0, the controller controls the opening degree of the fresh air valve, so that the fresh air volume delivered by the air supply pipe increases from Q ₁ to Q ₁ ′, controls the adjustment degree of the regulating valve, and makes the return air volume delivered by the return air pipe Decrease from Q ₂ to Q ₂ ′, control the temperature of the heat conduction sheet attached to the inner wall of the ventilation duct from T ₁ to T ₂ , the temperature difference ΔT ₂ , and ΔT ₂ =T ₁ -T ₂ , Q ₁ ′ +Q ₂ ′>Q, the temperature difference △T ₂ reduces the thickness of the thermal expansion and contraction layer from L ₁ to L ₂ , the amount of expansion and contraction is △L, ΔL=L ₁ -L ₂ , and the cross-sectional area of the ventilation duct increases from A is A';

in,

ΔT ₁ =αΔT ₂ =βΔL(1)

$\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}{{\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

$\frac{<span\; class="notranslate">\; |</span>\sqrt{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; -</span>\sqrt{{\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}<span\; class="notranslate">\; |</span>}{\sqrt{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

In the formula, the linear coefficients α and β are constants;

If △T ₁ <0, the controller controls the opening degree of the fresh air valve so that the fresh air volume delivered by the air supply pipe is reduced from Q ₁ to Q ₁ ′, and controls the adjustment degree of the regulating valve so that the return air volume delivered by the return air pipe is changed from Q ₂ increases to Q ₂ ′, controls the temperature of the heat conduction sheet attached to the inner wall of the ventilation duct from T ₁ to T ₂ , the temperature difference is ΔT ₂ , and ΔT ₂ =T ₂ -T ₁ , Q ₁ ′+Q ₂ ′<Q, changing the temperature difference △T ₂ makes the thickness of the thermal expansion and contraction layer increase from L ₁ to L ₂ , the amount of expansion and contraction is △L, ΔL=L ₂ -L ₁ , the cross-sectional area of the ventilation duct is A is reduced to A';

Case 2: The air supply speed of the ventilation duct changes

If △T ₁ >0, the air supply speed of the ventilation duct needs to be increased, then the controller controls the opening degree of the fresh air valve, so that the fresh air volume delivered by the air supply duct increases from Q ₁ to Q ₁ ′, and the control valve Adjust the degree so that the return air volume transported by the return air duct is reduced from Q ₂ to Q ₂ ′, and Q ₁ ′+Q ₂ ′>Q; the temperature of the heat conduction sheet remains unchanged; or the controller controls the temperature of the heat conduction sheet to increase , the temperature of the thermal pad increases from T ₁ to T ₂ , the temperature difference is △T ₂ , and ΔT ₂ =T ₂ -T ₁ , changing the temperature difference △T ₂ makes the thickness of thermal expansion and contraction layer increase from L ₁ to L ₂ , the amount of expansion and contraction is △L (ΔL=L ₂ -L ₁ ), and the cross-sectional area of the ventilation duct is reduced from A to A';

If △T ₁ <0, the air supply speed of the ventilation duct needs to be reduced, then the controller controls the opening degree of the fresh air valve, so that the fresh air volume delivered by the air supply duct is reduced from Q ₁ to Q ₁ ′, and the control valve's Adjust the degree so that the return air volume delivered by the return air duct increases from Q ₂ to Q ₂ ′, and Q ₁ ′+Q ₂ ′<Q; the temperature of the heat conduction sheet remains unchanged; or the controller controls the temperature of the heat conduction sheet to decrease Small, the temperature of the thermal pad decreases from T ₁ to T ₂ , the temperature difference is △T ₂ , and ΔT ₂ =T ₁ -T ₂ , changing the temperature difference △T ₂ makes the thickness of the thermal expansion and contraction layer decrease from L ₁ to L ₂ , the expansion and contraction amount is △L (ΔL=L ₁ -L ₂ ), and the cross-sectional area of the ventilation duct increases from A to A'.

Compared with the prior art, the present invention has the following technical effects:

1. The present invention is provided with a ventilation duct, whose cross section is a quarter circle, installed at the corner of the top of the room, using the air supply port and the two side walls of the corner to form a double-sided air supply method of attaching jets, forming a wall-attached The column-type air supply airflow reduces the entrainment of the air supply airflow to the indoor air, so that before the air supply airflow is attached to the side wall and sent to the work area, the amount of mixing with indoor polluted air or hot air is reduced, and the The quality of the air supply; after the column-type air supply air reaches the bottom corner of the room, the impact jet formed by it hits the bottom plate and spreads along the fan-shaped radial direction on the bottom plate, forming a cold air pool with a wider coverage and the maximum air flow The role of the entire work area, thereby ensuring the freshness of the air in all work areas, so that the air quality and temperature and humidity of the work area meet the comfort requirements.

2. Install the air supply device and install it in the corner of the top of the room without occupying the lower space of the room. The arrangement of the device is simple and convenient.

3. Set up the air return device to transport the gas in the exhaust pipe to the air supply pipe, mix it with the fresh air, and re-transmit it to the ventilation pipe, so as to be reused and save energy.

4. A thermal expansion and contraction layer is installed in the ventilation duct, and the thermal expansion and contraction layer is wrapped inside it. The thermal expansion and contraction layer can expand and contract with the temperature change of the thermal conductivity sheet, so that the inner diameter of the ventilation duct changes. , Control the amount of air supply air flow into the work area, so that the temperature and humidity in the room are suitable.

5. The control method of the single-side ventilation device forming the air pool airflow organization of the present invention, according to the temperature of the exhaust pipe, conveniently and effectively controls the mixing ratio of fresh air and return air, and the diameter of the ventilation pipe, Make the room reach the temperature and humidity suitable for the human body.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the ventilation duct structure;

Fig. 3 is the indoor air streamline diagram that adopts device of the present invention to form;

Figure 4 is the cloud diagram of the diagonal surface velocity of the room where the air supply outlet is located when the air supply speed of Experiment 1 is 1m/s;

Fig. 5 is a cloud map of air temperature distribution at different sections in the experiment 1 room, Fig. 5 (a1) is an indoor sectional view at x=1, Fig. 5 (a2) is a cloud map of air temperature distribution at x=1, and Fig. 5 (b1) is y=2.5 indoor cross-sectional view, Figure 5(b2) is the cross-sectional air temperature distribution cloud map at y=2.5, Figure 5(c1) is the indoor cross-sectional view at z=1.5, Figure 5(c2) is the cross-sectional air at z=1.5 Temperature distribution cloud map;

Fig. 6 is the indoor air streamline diagram of the slit type surface ventilation device in experiment two;

Fig. 7 is the air temperature distribution cloud map at different sections in the room using the slit-shaped ventilation device in Experiment 2. Fig. 7 (a1) is the indoor sectional view at x = 1, and Fig. 7 (a2) is the cross-sectional air at x = 1 Temperature distribution cloud map, Figure 7(b1) is the indoor cross-sectional view at y=2.5, Figure 7(b2) is the cross-sectional air temperature distribution cloud map at y=2.5, Figure 7(c1) is the indoor cross-sectional view at z=1.5, Figure 7 (c2) is the cloud map of the cross-sectional air temperature distribution at z=1.5;

Fig. 8 is that adopting the air supply speed of the device of the present invention to be 2m/s in experiment three, the cloud diagram of the diagonal surface velocity of the room where the air supply outlet is located;

Fig. 9 is a nephogram of the diagonal surface velocity of the room where the air supply outlet is located in Experiment 4 where the air supply speed of the device of the present invention is 3m/s.

The symbols in the figure represent: 1—regulating valve, 2—fresh air valve, 3—air handler, 4—air supply pipe, 5—wire, 6—air supply valve, 7—air supply port, 8—ventilation pipe, 9—row Tuyere, 10—exhaust pipe, 11—sensor, 12—controller, 13—exhaust valve, 14—heat guide sheet, 15—thermal expansion and contraction layer, 16—heat insulation layer, 17—return air duct.

The solutions of the present invention will be further explained and described in detail below in conjunction with the accompanying drawings and embodiments.

Detailed ways

Comply with above-mentioned technical scheme, referring to Fig. 1, the one-sided ventilator that forms the air pool airflow organization of the present invention, comprises the ventilation duct 8 that is vertically installed in the top corner of the room, and described ventilation duct 8 communicates with the room, and its cross section is Quarter circle, the two vertical planes of the ventilation duct 8 are respectively parallel to the two walls at the corner of the room where it is installed; the air supply port 7 at the top of the ventilation duct 8 is externally connected to the air supply device; the room An exhaust device is also arranged on the top, and the exhaust device communicates with the room.

The air supply device of the present invention is installed on the upper part of the room without occupying the lower space of the room, and the arrangement of the device is simple and convenient. The cross-section of the ventilation duct 8 of the present invention is a quarter circle, and the ventilation duct 8 is a quarter cylinder. The air supply mode of the double-sided sticking jet is formed by using the air supply port and the two side walls of the corner, thereby forming a sticking airflow. The column-type air supply airflow on the wall, the column-type air supply airflow reaches the floor of the room, and the impact jet formed by it hits the bottom plate, and spreads along the fan-shaped radial direction on the bottom plate, forming a cold air pool with a wider coverage and the largest air supply flow The degree of effect on the entire work area, thus ensuring the freshness of the air in all work areas, so that the air quality and temperature and humidity in the work area meet the comfort requirements.

The device of the invention can directly deliver the wind to the working area, can effectively reduce the air temperature in the indoor working area, and achieve the effect of energy saving.

The ventilation duct 8 is installed above the ceiling of the room at the corner of the top of the room; the intersection of the two planes along the vertical direction of the ventilation duct 8 is perpendicular to the vertical line at the corner of the top of the room. The distance is d, and its ratio to the radius R of the air outlet 7 satisfies

The air flow sent by the ventilation duct 8 can form a jet flow attached to the side wall, further reducing the amount of mixing with indoor polluted air or hot air, and improving the quality of the air supply.

The air flow is sent out from the ventilation duct 8 to form a jet. Since the bottom surface of the ventilation duct 8 is close enough to the side wall, the air flow sent out on both sides close to the side wall and away from the side wall respectively produces entrainment effect on the air in its surrounding environment, and the two sides The entrained air mass is not equal, and the air mass entrained by the air flow away from the side wall is more than the air mass entrained by the air flow near the side wall; due to the energy transferred to the environment on both sides by the jet flow through the turbulent mixing effect on the boundary Basically equal, so the airflow entrainment speed on the side away from the side wall is slow, and the airflow entrainment speed on the side close to the side wall is fast, so the airflow pressure on the side close to the side wall is small, the jet deflects to the side close to the side wall, and then close to the side wall The air entrainment speed is faster and the pressure is lower on one side of the side wall, and the jet continues to deflect to the side wall until it is completely attached to the side wall to form a stable flow. When d increases, the ambient air quality affected by the entrainment effect on both sides of the airflow sent out will gradually become equal at the same time, and there will be no pressure difference on both sides of the airflow, so that the airflow will not be attached to the side wall. test, select

The selection of the height of the ventilation duct 8 considers that it can form a stable quarter-cylindrical airflow. Through test analysis, its height should be greater than 100mm, so as to prevent the airflow sent from the air outlet at the bottom of the ventilation duct 8 from spreading around. Exacerbating the occurrence of air turbulence. At the same time, from the perspective of equipment installation and aesthetics, the height of the ventilation duct 8 should not exceed the height of the ceiling from the roof.

The selection of the radius of the quarter circular cross-section of the ventilation duct 8 is calculated according to the air supply volume Q and the air outlet velocity V of the air supply port, and the calculation formula is:

Specifically, the air supply device includes an air supply pipe 4 on which a fresh air valve 2 and an air supply valve 6 are sequentially arranged along the wind direction, and the end of the air supply pipe 4 is connected to the ventilation duct 8 . Further, an air handler 3 is arranged between the fresh air valve 2 and the air supply valve 6 on the air supply pipe 4 . The air handler 3 can choose a combined metal hanging air handling unit model ZKJ6-DT, with a rated air volume of 6000m ³ /h.

Specifically, the exhaust device includes an exhaust pipe 10, and one end of the exhaust pipe 10 is connected to the air outlet 9 at the top of the room.

The air supply pipe 4 is used to transport fresh air into the ventilation duct 8, and the air supply airflow formed by the ventilation duct 8 enters the work area and takes away the heat and polluted gas generated by the human body and heating equipment. The wind device is exhausted to the outside.

The fresh air valve 2 is used to adjust the amount of fresh air entering the ventilation duct 8; the air handler 3 is used to purify the fresh air entering the ventilation duct 8;

The air supply valve 6 can be flexibly adjusted according to the requirements for the air supply speed, so as to ensure that the room has suitable temperature and humidity. It has been verified by experiments that when the air supply velocity of the air supply port 7 is less than 0.5m/s, the effect of the columnar air supply air flow formed by the device of the present invention is not good for attaching to the side wall, and cannot form the required impact air flow with the floor of the room; When the air flow of the air supply port 7 is greater than 3m/s, the indoor personnel will have a "blowing feeling". Therefore, the air supply speed controlled by the air supply valve 6 ranges from 0.5 to 3m/s.

Further, an air return device is provided between the exhaust device and the air supply device.

Because the device of the present invention can effectively improve the quality of indoor air, it has an obvious effect on cooling the room, so that the indoor air discharged from the air outlet 9 is relatively low. The gas inside is transported in the air supply pipe 4, mixed with the fresh air, and re-transported in the ventilation duct 8, so as to be reused and save energy.

Specifically, the return air device includes a return air pipe 17, and the air return pipe 17 is provided with a regulating valve 1; the two ends of the return air pipe 17 are respectively connected to the air supply pipe 4 and the exhaust pipe 10; The air return device also includes an exhaust valve 13 arranged at the end of the exhaust pipe 10; one end of the air return pipe 17 connected to the exhaust pipe 10 is installed between the air outlet 9 and the exhaust valve 13, and the return air One end of the pipe 17 connected to the air supply pipe 4 is installed between the air handler 3 and the fresh air valve 2 .

The fresh air valve 2, regulating valve 1 and exhaust valve 13 are used to control the mixing ratio of fresh air and return air, so as to effectively save energy while ensuring suitable indoor temperature and humidity.

Further, a thermal expansion and contraction layer 15 is installed on the inner wall of the ventilation duct 8 , and the thermal conduction sheet 14 is wrapped inside it. Further, the thermal expansion and contraction layer 15 wraps the heat insulation layer 16 on the outside.

The thermal expansion and contraction layer 15 can expand and contract with the temperature of the heat conducting sheet 14, so that the inner diameter of the ventilation duct 8 changes, and the amount of the air flow entering the working area is controlled. The thermal expansion and contraction layer 15 is made of a flexible composite material with large deformation range, high bearing capacity and good fatigue resistance. The temperature conducting sheet 14 is made of copper.

The heat insulation layer 16 is used to prevent the temperature change of the heat conduction sheet 14 from changing the parameters of the air supply airflow in the ventilation duct 8 .

Further, the return air pipe 10 is provided with a sensor 11 between the air exhaust valve 13 and the air exhaust port 9, the sensor 11 is connected to the controller 12, and the controller 12 communicates with the regulating valve 1 and the fresh air through the wire 5. The valve 2 and the temperature guide sheet 14 are all connected.

The sensor 11 can be a temperature sensor or a CO ₂ sensor, the temperature sensor is used to monitor hot gas flow, and the CO ₂ sensor is used to monitor 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 the fresh air and the return air; at the same time, it controls the temperature variation of the heat conducting sheet 14, thereby The amount of expansion and contraction of the thermal expansion and contraction layer 15 is adjusted.

A control method for a single-side ventilation device forming an air pool airflow organization, wherein the sensor 11 adopts a temperature sensor, and the specific control method is as follows:

Step 1: given the initial temperature value T ₀ , the initial fresh air volume delivered by the air supply pipe 4 is Q ₁ , and the initial return air volume delivered by the return air pipe 10 is Q ₂ , then the total ventilation volume of the ventilation duct is Q=Q ₁ + Q ₂ ; the temperature sensor measures the return air temperature in the exhaust duct 10 as T (T≠T ₀ ), and transmits the above information to the controller 12;

Step 2: The controller 12 calculates the temperature difference ΔT ₁ (ΔT ₁ =TT ₀ ), and 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, the regulating valve 1 and The temperature change of the temperature conducting sheet 14, its specific implementation method is as follows:

Situation 1: Keep the air supply speed of the ventilation duct 8 constant

If ΔT ₁ >0, the controller 12 controls the opening degree of the fresh air valve 2, so that the fresh air volume delivered by the air supply pipe increases from Q ₁ to Q ₁ ′, controls the adjustment degree of the regulating valve 1, and makes the return air pipe 17 The return air volume delivered is reduced from Q ₂ to Q ₂ ′, and the temperature of the heat conducting sheet 14 attached to the inner wall of the ventilation duct 8 is controlled to change from T ₁ to T ₂ , the temperature difference is ΔT ₂ , and ΔT ₂ =T ₁ - T ₂ , Q ₁ ′+Q ₂ ′>Q, changing the temperature difference △T ₂ makes the thickness of the thermal expansion and contraction layer 15 decrease from L ₁ to L ₂ , and the stretching amount is △L (ΔL=L ₁ -L ₂ ), and then Cause the cross-sectional area of the ventilation duct 8 to increase from A to A';

in,

ΔT ₁ =αΔT ₂ =βΔL(1)

$\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}^{<span\; class="notranslate">\; \&prime;</span>}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}{{\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

$\frac{<span\; class="notranslate">\; |</span>\sqrt{\mathrm{<span\; class="notranslate">\; A</span>}}<span\; class="notranslate">\; -</span>\sqrt{{\mathrm{<span\; class="notranslate">\; A</span>}}^{<span\; class="notranslate">\; \&prime;</span>}}<span\; class="notranslate">\; |</span>}{\sqrt{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; \&Delta;</span>}\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

In the formula, the linear coefficients α and β are constants.

If △T ₁ <0, then the controller 12 controls the opening degree of the fresh air valve 2, so that the fresh air volume delivered by the air supply pipe is reduced from Q ₁ to Q ₁ ′, controls the adjustment degree of the regulating valve 1, and makes the return air pipe 17 deliver The return air volume is increased from Q ₂ to Q ₂ ′, and the temperature of the heat conducting sheet 14 attached to the inner wall of the ventilation duct 8 is controlled to change from T ₁ to T ₂ , the temperature difference is ΔT ₂ , and ΔT ₂ =T ₂ -T ₁ , Q ₁ ′+Q ₂ ′<Q, changing the temperature difference △T ₂ makes the thickness of the thermal expansion and contraction layer 15 increase from L ₁ to L ₂ , and the stretching amount is △L (ΔL=L ₂ -L ₁ ) , which in turn causes the cross-sectional area of the ventilation duct 8 to be reduced from A to A';

(2) The air supply speed of the ventilation duct 8 changes

If ΔT ₁ >0, then the air supply speed of the ventilation duct 8 needs to be increased, and then the controller 12 controls the opening degree of the fresh air valve 2, so that the fresh air volume delivered by the air supply duct is increased from Q ₁ to Q ₁ ', and the control Adjust the degree of adjustment of the valve 1, so that the return air volume delivered by the return air pipe 17 is reduced from Q ₂ to Q ₂ ′, and Q ₁ ′+Q ₂ ′>Q; the temperature of the temperature guide sheet 14 remains unchanged; or the controller 12 alone Control the temperature increase of the heat conduction sheet 14, the temperature of the heat conduction sheet 14 increases from T ₁ to T ₂ , the temperature difference is ΔT ₂ , and ΔT ₂ =T ₂ -T ₁ , changing the temperature difference ΔT ₂ causes thermal expansion and cold contraction The thickness of the layer 15 increases from L ₁ to L ₂ , and the expansion and contraction amount is ΔL (ΔL=L ₂ −L ₁ ), which in turn causes the cross-sectional area of the ventilation duct 8 to decrease from A to A'.

If △T ₁ <0, if the air supply speed of the ventilation duct 8 needs to be reduced, the controller 12 controls the opening degree of the fresh air valve 2, so that the fresh air volume delivered by the air supply duct is reduced from Q ₁ to Q ₁ ', and the control Adjust the degree of adjustment of the valve 1, so that the return air volume delivered by the return air pipe 17 increases from Q ₂ to Q ₂ ′, and Q ₁ ′+Q ₂ ′<Q; the temperature of the temperature guide sheet 14 remains unchanged; or the controller 12 Separately control the temperature of the heat conduction sheet 14 to decrease, the temperature of the heat conduction sheet 14 decreases from T ₁ to T ₂ , the temperature difference is ΔT ₂ , and ΔT ₂ =T ₁ -T ₂ , changing the temperature difference ΔT ₂ makes heat expand and cool The thickness of the shrinking layer 15 is reduced from L ₁ to L ₂ , and the expansion and contraction amount is ΔL (ΔL=L ₁ −L ₂ ), which in turn causes the cross-sectional area of the ventilation duct 8 to increase from A to A'.

experiment analysis

experiment one

According to the actual situation, establish a numerical calculation model with a room size of 4000(x)×5000(y)×2600(z)(mm ³ ), the radius of the ventilation duct: R=356(mm), and the exhaust outlet is arranged in the middle of the top of the room On the ceiling, the size of the exhaust outlet: 400×200 (mm ² ), the heat source of the room is simplified to a floor heat flux density of 50w/m ² , and the rest of the walls are insulated. The air supply temperature is 291K, and the air supply speed is 1m/s.

In order to verify the airflow distribution and indoor cooling effect of the device of the present invention, the average turbulent energy model, that is, the standard k-ε model, is used to solve the equations.

The finite volume method is used to discretize the above governing equations. The discretization format is the second-order ^upwind style. After introducing boundary conditions, the SIMPLE algorithm is used to solve the discretization equations. When the residual values of points are all less than 10 ^-6 , the governing equations converge, and the indoor air flow can be obtained from this.

Fig. 3 is the indoor air streamline diagram that adopts the device of the present invention to form; It can be clearly seen from Fig. 3 that the column airflow sent by the air outlet is attached to the two side walls of the top corner along the side wall, and then sent down along the side walls It reaches the bottom corner of the room, hits the floor and spreads, forming a pool of air with uniform velocity. The diffusion range of the column-type air supply air is very large. It is calculated that when the air supply speed is 1m/s, its jet area accounts for 100% of the floor of the entire room, that is, the air supply airflow completely covers the entire working area. Referring to Figure 4, the wind speed in the working area is about 0.1m/s, and the end speed of the jet reaching the opposite side wall is 0.1m/s.

Fig. 5 is a cloud map of indoor air temperature distribution in different sections formed by the device of the present invention; it can be seen from Fig. 5 that the temperature distribution in the room is relatively uniform, and the temperature difference at different positions in the same section is small. After calculation, when the air supply temperature is 291K, the average temperature of the x=2m cross-section is 298.7K, the average temperature of the y=2.5m cross-section is 298.6K, and the average temperature of the breathing zone height (z=1.5m) is 298.8K. The average temperature of other sections is shown in Table 1. It can be seen from Table 1 that the temperature changes in different sections are very small, and the maximum temperature difference in different sections is 0.1K. It can be seen that the temperature of the entire room supplied by the column ventilation and air conditioning system is relatively uniform.

Experiment 2

The device of the present invention and the most commonly used slit-type vertical wall attached jet ventilation device are compared and tested on the indoor airflow diffusion effect and the temperature field in the working area.

Under the same conditions as Experiment 1, the air supply outlet of the slit-type air supply device is arranged on the ceiling close to the side wall. Based on the same area as the air outlet of the device of the present invention, the size of the slit air outlet is 2000×50 (mm ² ), the air supply temperature is 291K, and the air supply speed is 1m/s.

Figure 6 is the indoor air flow diagram of the slit-type surface ventilation device; it can be seen from Figure 6 that the surface airflow sent out from the air supply port is attached to the side wall surface along the vertical wall, and then sent down along the side wall to hit the floor for diffusion , forming an air pool. Its air supply mechanism is similar to the device of the present invention, but the diffusion range of the slit-type surface air supply air flow is not as large as that of the device of the present invention. After calculation, when the air supply speed is 1m/s, the air jet of the surface type air supply device Area ABCD occupies 69% of the entire room floor.

Figure 7 is a cloud map of the indoor temperature distribution of the slit surface ventilation system; it can be seen from Figure 7 that the indoor temperature distribution of the slit surface air supply device is not uniform, and the temperature difference at different positions in the same section is relatively large. It is calculated that under the condition of the air supply temperature of 291K, the average temperature of x=1m cross-section is 300.5K, the average temperature of y=2.5m cross-section is 301.2K, and the average temperature of breathing zone height (z=1.5m) is 300.8K. The average temperature of other sections is shown in Table 1. It can be seen from Table 1 that the temperature difference of different sections varies greatly, and the maximum temperature difference of the section can reach 0.4K. It can be seen that the temperature distribution of the entire room supplied by the slit surface ventilation device is not uniform.

By comparison, it is found that under the same air supply conditions, the air supply air flow jet area formed by the device of the present invention is 44.9% larger than the traditional surface air supply device, that is, the air supply efficiency is increased by 44.9%, thereby causing indoor pollutants The large amount of air renewal ensures the freshness of the air, improves the comfort of the air conditioner, and at the same time reduces the temperature significantly.

Table 1 is a comparison of the cross-section temperatures of the column ventilation and air-conditioning system and the surface air supply system. As can be seen from Table 1, the average temperature of different sections of the indoor room using the device of the present invention is lower than that of the surface air supply device, so that The average temperature of the entire indoor breathing zone of the column type ventilation device adopting the device of the present invention is 2.0K lower than that of the surface type air supply device. It can be seen that the cooling effect of the column type ventilation and air conditioning system is obvious, and the energy saving effect is remarkable. The reason is that when the column-type air supply system reaches the ground, the contact area between the low-temperature supply air flow and the indoor high-temperature air is smaller than that of the surface-type air supply system. The contact area between the jet and the indoor air is 3.3m ^{2 , and the contact area between the jet and the indoor air along the vertical wall is 5.46m 2 )} , resulting in small heat transfer, which leads to the column air supply reaching the working area The hourly temperature is lower than the airflow temperature of the surface air supply system, so the cooling effect is obvious, and the system is more energy-saving. Furthermore, the column type air supply device of the present invention is installed on the upper part of the room to improve the utilization efficiency of the room.

Table 1v=1m/s column type air supply device and surface type air supply device in the comparison of the average temperature of different sections (K)

Experiment three

Under the same conditions as Experiment 1, if the air supply speed is changed to 2m/s, the wind speed in the working area will be about 0.2m/s, which not only increases the air supply volume, but also improves the freshness of the indoor air. The terminal velocity of the jet reaching the opposite side wall is 0.2m/s, and the distance of the jet is longer, which improves the air supply efficiency of the column type air supply device of the present invention, see FIG. 8 . When the air supply speed is 2m/s, the average temperature of each section is shown in Table 2. It can be seen from Table 2 that when v=2m/s, the average temperature of each section in the room is about 4K lower than when v=1m/s, the cooling effect is obvious, and the average temperature of each section is equal, indicating that the room indoor The temperature distribution is very even.

Table 2v=2m/s column air supply device comparison of average temperature in different sections (K)

Experiment four

Under the same conditions as Experiment 1, if the air supply speed is changed to 3m/s, the wind speed in the working area will be about 0.3m/s, which not only increases the air supply volume, but also improves the freshness of the indoor air. The terminal velocity of the jet reaching the opposite side wall is 0.3m/s, and the distance of the jet is longer, which improves the air supply efficiency of the column type air supply device of the present invention, see FIG. 9 . When the air supply speed is 3m/s, the average temperature of each section is shown in Table 3. It can be seen from Table 3 that when v=3m/s, the average temperature of each section in the room is about 1.1K lower than when v=2m/s, and the cooling effect tends to decrease. The temperature distribution in the room is still very uniform at this point.

Table 3v=3m/s column air supply device comparison of average temperature in different sections (K)

In summary, it can be seen that when the column-type air supply device of the present invention is used to supply air, the cooling effect of the working area of the room is obvious, and the temperature distribution is relatively uniform. The greater the air supply speed, the greater the speed of the working area of the room. At the same time, the greater the air velocity at the end of the jet, the longer the distance of the air supply jet, so as to ensure the air quality and thermal comfort of the room.

Claims (10)

1. The unilateral ventilation device for forming the air flow organization of the air pool is characterized by comprising a ventilation pipeline (8) vertically arranged at the corner of the top wall of a room, wherein the ventilation pipeline (8) is communicated with the room, the cross section of the ventilation pipeline is in a quarter circle shape, and two planes of the 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 unilateral 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), a fresh air valve (2) and an air supply valve (6) are sequentially arranged on the air supply pipe (4) along the wind direction, and the tail end of the air supply pipe (4) is connected with the ventilation pipeline (8).

3. The single-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. A single-sided ventilation device for forming an air flow pattern in an air pool as claimed in claim 3, wherein a return air device is provided between the exhaust device and the supply device.

5. The unilateral ventilation device for forming an air flow organization of an air pool according to claim 4, wherein the return air 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 arranged between the air supply valve (6) and the fresh air valve (2).

6. The unilateral ventilation device for forming an air flow organization of an air pool according to claim 5, characterized in that the inner wall of the ventilation duct (8) is provided with a thermal expansion and contraction layer (15) which is internally wrapped with a heat conducting sheet (14).

7. The unilateral ventilation device for forming the air flow organization of the air pool according to claim 6, wherein a sensor (11) is arranged on the return air pipe (10) between the exhaust valve (13) and the exhaust port (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 a lead (5).

8. A single-sided ventilation device for forming an air flow pattern of an air pool according to claim 6 or 7, characterized in that the thermal expansion and contraction layer (15) is externally wrapped by a thermal insulation layer (16).

9. The unilateral ventilation device for forming an air flow organization of an air pool according to any one of claims 1 to 7, characterized in that the vertical distance d 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 such that the ratio of the distance d to the radius R of the air supply opening (7) is such that

10. A control method of a unilateral 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 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 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)

<math> <mrow> <mfrac> <mrow> <msub> <mi>Q</mi> <mn>1</mn> </msub> <mo>+</mo> <msub> <mi>Q</mi> <mn>2</mn> </msub> </mrow> <mi>A</mi> </mfrac> <mo>=</mo> <mfrac> <mrow> <msubsup> <mi>Q</mi> <mn>1</mn> <mo>&prime;</mo> </msubsup> <mo>+</mo> <msubsup> <mi>Q</mi> <mn>2</mn> <mo>&prime;</mo> </msubsup> </mrow> <msup> <mi>A</mi> <mo>&prime;</mo> </msup> </mfrac> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow> </math>

<math> <mrow> <mfrac> <mrow> <mo>|</mo> <msqrt> <mi>A</mi> </msqrt> <mo>-</mo> <msqrt> <msup> <mi>A</mi> <mo>&prime;</mo> </msup> </msqrt> <mo>|</mo> </mrow> <msqrt> <mi>&pi;</mi> </msqrt> </mfrac> <mo>=</mo> <mi>&Delta;</mi> <mi>L</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow> </math>

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, the air supply speed of the ventilation pipeline (8) needs 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 air supply pipe is 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, the air supply speed of the ventilation pipeline (8) is required to be reduced, and 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'.