KR20030065931A - atmospheric diffusion device of downtown street and method of atmospheric diffusion using the device - Google Patents

Abstract

PURPOSE: A device and a method for sucking air on a road of a downtown area are provided to forcibly diffuse exhaust gas of sluggish vehicles on the ground up to the 1/4 position of an average height of buildings in a roadside. CONSTITUTION: An intake duct(10) is installed in the outside of a high-storied building near a road, formed an intake port in the upper end and installed in a basement(2) of the high-storied building by folding the lower part. A blower(20) is installed in the basement and connected with the intake duct. A discharge duct(30) is connected with the blower, touched with a footpath surface of the road by inclining crosswise and installed a discharge nozzle in the end to be touched with the footpath surface. Thereby, exhaust gas of vehicles are diffused over the 1/4 position of an average height of buildings in a roadside forcibly and the air over the 1/4 position is diffused naturally. Therefore, the air pollution by exhaust gas of vehicles is reduced effectively.

Description

Atmospheric diffusion device of downtown street and method of atmospheric diffusion using the device

The present invention relates to an air diffusion device on a downtown street and an air diffusion method using the same. More specifically, the present invention relates to an apparatus for spreading stagnant and contaminated air on a street by inhaling clean air from an upper floor of an urban high-rise building and forcibly spraying it from the ground in the street, and an air diffusion method using the same.

In our country, the demand for automobiles is rapidly increasing due to the improvement of people's living standards and social activities due to the rapid economic growth. It is causing pollution problems.

In particular, in urban areas, air pollution due to autonomous exhaust gas is very serious due to frequent traffic congestion and high-rise buildings built on the streets of downtown areas.

When exposed to air pollutants emitted from automobiles for a long time, the disease may occur due to a significant decrease in heart function or lung function, and the elderly, infants, and the weak may cause damage in a short time, leading to death.

The World Health Organization (WHO) recently surveyed car exhaust gas-related diseases in three countries, including France, Switzerland, and Austria. As a result, more than 21,000 children annually suffer from cardiopulmonary dysfunction, asthma, bronchitis, etc. Appeared to be hidden. This is more than double the number of child traffic accident deaths in the same period.

As such, the vehicle exhaust gas in the city not only causes serious damage to an unspecified number of people, but also causes serious damage to property due to corrosion and color change of buildings or civil structures.

The inventors conducted a study to investigate the atmospheric diffusion phenomenon in the streets of downtown area (doctoral dissertation "Research on characteristics and application of air pollutants and wind environment"). As follows.

Diffusion phenomena in urban streets are difficult to interpret as one-dimensional box model due to the complicated flow of the flow field by the surrounding middle and high-rise buildings. Through experiments, the phenomenon of air pollutants emitted from automobiles along the streets was identified.

Tracer-gas used ethylene having similar specific gravity to the atmosphere. Tracer-gas was generated at 1cc / sec per inlet at 18 points on the centerline of the road as shown in FIG. Tracer-gas measurement was performed at 18 points and 36 points in total by 10cm on the center line between the road center line and the buildings on both sides.As shown in Fig. 3, the ground, 1 / 4H, 2 / 4H , Was measured at 3 / 4H, H height. Tracer-gas inflow and measurement were performed using aluminum pipe with an internal diameter of 3mm.

The experimental wind speed (U _H ) was 5m / s as the wind speed at the upper end of the average height (19cm) around the road. The wind direction was conducted in the vertical direction (90 °, 270 °) when the road and the parallel direction was 0 °, and the wind up side was indicated by Line A and the downside was indicated by Line B.

The concentration C (ppm) obtained as a result of the experiment was expressed by dimensionless by the following equation.

C _m = C / C _o [ppm / ppm]

Where C = concentration [ppm]

C _o = q / (UH ² ) [ppm]

Where q: Tracer Gas is generated, U: Standard Wind Speed, H: Building Height

The ventilation frequency N is expressed by the following equation.

N = Q / V

Where Q (ventilation amount) = q (cc / sec) / Ca (ppm)

q = total gas generation

Ca = mean measured concentration

V = volume of interlateral space

As shown in FIG. 4, the surface concentration (C / Co) showed a high concentration of about 3.0 to 8.8, and the change was severe depending on the position of the measurement point. On the other hand, the concentration of aboveground space in the transverse space was largely diffused and showed little change according to the measurement point.

Tables 1 and 5 show the concentrations of each measuring point by averaging the concentrations of all the measuring points for each wind direction and each line, and the ground concentration shows a high concentration of 4.5 to 5.8, but is relatively high at a height of 1/4 H or more. At low concentrations of 0.5 to 1.6, the higher the height of the measuring point, the lower the concentration. In addition, the concentration of the measurement points on the upstream side (Line A) was higher than on the downside side (Line B). This is thought to be due to less diffusion than the wind side due to the influence of the wake of the roadside building on the side of the street.

The ventilation amount and the number of ventilation of the virtual space in the street (the width between both buildings on the street and the average height of the building on the street 12cm (B) x 19cm (H)) are shown in Table 2 for each wind direction. The actual conversion ventilation rate of the virtual space was 10 times / hr for the 90 ° wind and 7 times / hr for the 270 ° wind when the wind speed of the building's average height was 1m / s. In the same street, the number of 270 ° winds is less than the 90 ° wind because the buildings on the side of the wind are much denser than the 90 ° winds. do.

Based on the above results, the atmospheric diffusion is relatively well above the 1/4 point (model height of about 7.5cm, actual height of about 19m) of the average height (H: model height of about 19cm, actual height of about 76m) of roadside buildings in downtown. However, it can be seen that, at the quarter point or less, atmospheric diffusion is hardly achieved due to the high-rise buildings densely located on the side of the road. Furthermore, it can be seen from FIG. 5 that the stagnation of air pollutants due to automobile exhaust gas is very serious at 1/50 H (actual height of about 1.5 m), which is a pedestrian's breathing height.

Therefore, vehicle exhaust gas is not diffused from the quarter point or less of the average height H of the roadside to the ground, causing a serious air pollution.

The present invention has been made to solve the above problems, an apparatus for forcibly diffusing the vehicle exhaust gas stagnant on the ground in the downtown street up to 1/4 of the average height (H) of the roadside building and the air diffusion method using the same To provide that purpose.

1 is a schematic diagram showing a specific embodiment of the present invention.

2 and 3 are schematic diagrams illustrating the wind tunnel test method for identifying the atmospheric diffusion phenomenon in the downtown area.

4 and 5 are graphs showing the results of the wind tunnel test.

<Description of Major Codes in Drawings>

1: high-rise building 2: basement

10: suction duct 20: blower

30: discharge duct

With reference to the accompanying drawings will be described in detail a specific embodiment of the present invention.

1 is a schematic diagram showing a specific embodiment of the present invention. As shown, the air diffusion apparatus in the downtown area of the present invention includes a suction duct 10, a blower 20, and a discharge duct 30.

The suction duct 10 is installed in the longitudinal direction on the outer surface in contact with the horizontal side of the high-rise building, the suction end is formed in the upper end of the suction duct 10 through the suction port to clean air in the upper floor of the high-rise building through the suction duct Inhalation is to (10).

An air inlet formed at the upper end of the suction duct is preferably equipped with an air filter to filter pollutants in the atmosphere.

The lower portion of the suction duct 10 is bent from the ground toward the high-rise building is installed in the basement in the high-rise building is connected to the blower 20 to be described later.

The blower 20 is installed in the basement of the high-rise building, connected to the lower portion of the suction duct 10 and the discharge duct 30 to be described later to force clean air in the upper part of the high-rise building through the suction duct 10. Suction into the discharge duct 30 to be described later.

One end of the discharge duct 30 is connected to the blower 20, and the other end is inclined horizontally outside the basement of the high-rise building to be in contact with the horizontal walkway surface.

The discharge nozzle is mounted at the end of the discharge duct 30 which is in contact with the side surface of the discharge duct 30 to force the clean air of the upper floor of the high-rise building discharged through the discharge duct 30 so that 1 The vehicle exhaust gas, which has not been diffused below / 4, is forced to diffuse to more than one quarter of the average height (H) of the building on the side of the road.

Operation of the blower 20 is preferably controlled automatically by an automatic control system linked to the air pollution measurement device. That is, the air pollution measurement device detects the air pollution concentration on the downtown street and automatically controls the operation of the blower 20 by an automatic control system linked thereto.

When the exhaust gas of automobiles stagnated to more than a quarter of the average height (H) of roadside buildings is forcedly diffused, atmospheric diffusion is caused by natural winds.

The air diffusion device on the downtown street is installed at predetermined intervals in both buildings of the downtown street. At this time, it can be installed facing each other on both sides of the side, but it is preferable to install in a zigzag form for the efficiency of atmospheric diffusion.

On the other hand, the air diffusion device in the downtown horizontal street of the present invention may be installed in a high-rise building already built on both sides of the street as described above, may be installed in a new high-rise building on the street side.

Although not shown, in this case, the suction duct 10 is aesthetically preferable to be installed inside the high-rise building. At this time, the upper end of the suction duct 10 partially protrudes above the roof of the high-rise building, the protruding end is formed with a suction port, and the lower end is installed in the basement of the high-rise building.

The blower 20 and the discharge duct 30 are installed as in the existing high-rise building.

The air diffusion method using the air diffusion apparatus on the downtown street of the present invention is composed of the following steps.

First, as shown in FIG. 1, air diffusion devices on the horizontal streets of the downtown are installed at regular intervals on both horizontal buildings. At this time, the air diffusion device in the downtown horizontal street may be installed to face each other in a predetermined interval on both sides of the high-rise buildings, it is preferable to install in a zigzag form for the efficiency of air diffusion.

When the air diffusers on the downtown streets are installed at both sides of the high-rise buildings at regular intervals, the blower is operated to suck clean air in the upper part of the high-rise building through the suction duct. At this time, it is preferable to attach an air filter to the suction port formed in the suction duct 10 to filter the air sucked into the suction duct 10.

The clean air sucked into the upper floor of the high-rise building sucked into the suction duct 10 is discharged to the discharge duct 30 by the blower 20.

The clean air discharged from the upper floor of the high-rise building discharged to the discharge duct 30 is forcedly injected horizontally by the discharge nozzle mounted at the end of the discharge duct 30.

On the other hand, the operation of the blower 20 is preferably controlled automatically by an automatic control system linked to the air pollution measuring device. That is, the air pollution measurement device detects the air pollution concentration on the downtown street and automatically controls the operation of the blower 20 by an automatic control system linked thereto.

Car exhaust gas, which is stagnated below 1/4 of the average height (H) of roadside buildings by forced injection of forced air, is forced to diffuse to more than 1/4 of the average height (H) of roadside buildings. At more than a quarter of the average height (H) of the building, the atmosphere is diffused by natural wind.

On the other hand, the air diffusion method of the present invention can be carried out by installing the air diffusion device in the downtown street of the present invention in the high-rise building already built on the road side as described above, the air diffusion of the present invention in the high-rise building stretched along the street The apparatus may be installed.

Although not shown, in this case, the suction duct 10 is aesthetically preferable to be installed inside the stretched high-rise building. At this time, the upper end of the suction duct 10 partially protrudes above the roof of the high-rise building, the protruding end is formed with a suction port, and the lower end is installed in the basement of the high-rise building.

The blower 20 and the discharge duct 30 are installed as in the existing high-rise building.

The air diffusion apparatus and the air diffusion method using the same in the downtown street of the present invention is stagnated below 1/4 point of the average height (H) of the downtown roadside building to force the exhaust gas of automobiles causing severe air pollution of the roadside building Since the air is diffused to more than a quarter of the average height (H), and above that, due to the natural wind, it is possible to efficiently diffuse stagnant vehicle exhaust gas to reduce air pollution.

Claims (11)

A suction duct installed on an outer surface of the high-rise building, the suction end of which is formed at an upper end thereof, and the lower portion of which is bent from the ground and installed in a basement of the high-rise building; A blower installed in a basement of the high-rise building and connected to the suction unit; And A discharge duct connected to the blower and inclined horizontally outside the basement of the high-rise building to be in contact with the horizontal walkway surface, and having a discharge nozzle mounted at an end thereof in contact with the walkway surface; Atmospheric diffuser on the downtown horizontal, comprising a. Is installed inside the high-rise building stretched on the side of the downtown, the upper end is partially protruded over the roof of the high-rise building, the suction end is formed in the protruding upper end, the lower suction duct is installed in the basement of the high-rise building; A blower installed in a basement of the high-rise building and connected to the suction duct; And A discharge duct connected to the blower, the discharge duct being inclined horizontally outside the basement of the high-rise building so that the end abuts on the horizontal walkway surface, and a discharge nozzle is mounted at the end that abuts the walkway surface; Atmospheric diffuser on the downtown horizontal, comprising a. The air diffusion apparatus of claim 1 or 2, wherein an air filter is mounted at an inlet formed at an end of the suction duct. The air diffuser of claim 1, wherein the blower is automatically controlled in association with an air pollution measuring device. The air diffusion apparatus of claim 1, wherein the air diffusion apparatus is installed at both sides of the downtown street at regular intervals. The air diffusion apparatus of claim 5, wherein the air diffusion apparatus on the downtown street is installed in a zigzag form on both sides of the street. Installing an air diffusion device on an urban street at regular intervals on both sides of the street; Operating a blower to suck clean air in the upper part of the high-rise building through a suction port as a suction duct; And Discharging clean air sucked by the suction duct into the discharge duct by the blower and forcibly spraying the horizontal air by a discharge nozzle mounted at an end of the discharge duct; The air diffusion method of claim 1, further comprising forcibly diffusing vehicle exhaust gas, which is stagnated at least 1/4 of the average height of the roadside building by the forced injection of clean air. Installing an air diffusion device on a downtown street in a high-rise building stretched along a roadside; Operating a blower to suck clean air in the upper part of the high-rise building through a suction port as a suction duct; And Discharging clean air sucked by the suction duct into a discharge duct by the blower and forcibly spraying the discharge air by a discharge nozzle mounted at an end of the discharge duct; The air diffusion method of claim 1, further comprising forcibly diffusing vehicle exhaust gas which is stagnated at least 1/4 of the average height of the roadside building by the forced injection of clean air. The air diffusion method according to claim 7 or 8, wherein an air inlet formed at the end of the intake duct is provided with an air filter for air filtration. The air diffusion method according to claim 7 or 8, wherein the blower is automatically controlled by an automatic control device interlocked with an air pollution measuring device. The air diffusion method according to claim 7, wherein the air diffusion device on the downtown street is installed in a zigzag form on both sides of the building.