WO2013021466A1

WO2013021466A1 - Smoking room ventilation method

Info

Publication number: WO2013021466A1
Application number: PCT/JP2011/068176
Authority: WO
Inventors: 弦佐久間; 武松村; 康太竹田
Original assignee: 日本たばこ産業株式会社
Priority date: 2011-08-09
Filing date: 2011-08-09
Publication date: 2013-02-14

Abstract

The smoking room ventilation method is a method for ventilating a smoking room that is equipped with: an air inlet provided in the floor or near the floor; an air exhaust vent provided in the ceiling or near the ceiling; a table set on the floor and across which seated persons face each other; and a zonal blower vent formed in the table so as to run parallel or substantially parallel to the direction orthogonal to the direction in which the seated people face each other. The method comprises: a process of generating a gentle upward air flow by supplying air from the air inlet in the floor or near the floor; a process of exhausting the upward air flow through the air exhaust vent in the ceiling or near the ceiling; and a process of blowing warmed air upward from the zonal blower vent in the table. The warmed air has a higher temperature than the temperature at the ceiling or near the ceiling when the table is not blowing air.

Description

How to ventilate a smoking room

The present invention relates to a ventilation method for a smoking room.

In recent years, there has been increasing social interest in passive smoking, and indoor smoke separation is progressing. For example, in restaurants such as restaurants, smoke is divided into smoking areas and non-smoking areas. Even in such a smoking area, smokers and non-smokers may be present together. For this reason, in order to reduce the discomfort with respect to tobacco smoke of a nonsmoker, the indoor environment improvement is requested | required.

As a general ventilation method in restaurants, a mixed ventilation method in which air conditioning and ventilation are integrated is often adopted. In this ventilation method, for example, indoor air is mixed evenly by an air conditioner installed on the ceiling, and exhausted by air supply and exhaust.

However, since the mixed ventilation method mixes indoor air, tobacco smoke (dust) generated by smoking is also diffused into the room. As a result, in order to reduce tobacco smoke, it is necessary to dilute with an enormous amount of ventilation, which increases the operating cost of the air conditioning equipment.

For this reason, methods of efficiently ventilating while suppressing the amount of ventilation, that is, an underfloor ventilation method and a replacement ventilation method are known. The underfloor ventilation method is a method in which air-conditioned air is gently supplied from an indoor floor and exhausted from an exhaust port provided in or near the ceiling. The replacement ventilation method is a method in which air-conditioned air is gently supplied from an air supply port for replacement ventilation provided on the floor and exhausted from an exhaust port provided near the ceiling or near the ceiling.

In the underfloor ventilation method and the replacement ventilation method, air is supplied from the floor or near the floor and exhausted from the ceiling or near the ceiling, so that a gentle air flow (upward air flow) from the bottom to the top is generated. Cigarette smoke (dust) is carried by this air stream to the exhaust port and exhausted. The number of ventilations per hour at a restaurant is at most 40, and the updraft is approximately 0.03 m / s or less.

In restaurants, smokers and non-smokers may face each other across the table. When a smoker smokes, smoke (secondary smoke) due to cigarette combustion and smoke (discharged smoke) discharged by the smoker are generated.

In the above-described under-floor ventilation method and replacement ventilation method, the effect of the discharged smoke on the non-smokers facing each other cannot be suppressed. This is because the updraft generated by the underfloor ventilation method and the replacement ventilation method acts as a slow airflow against the discharged smoke, and the airflow is blocked and weakened by the table, and the non-faced airflow faces before it rises. This is to reach smokers.

On the other hand, Japanese Unexamined Patent Publication No. 7-63380 discloses an indoor air cleanup maintenance system. This air cleanliness maintenance system includes a floor blowing chamber provided under the floor and capable of blowing upward, and a porous carpet having air permeability laid on the upper surface of the air blowing port. The air intake port for exhausting indoor air is provided on the ceiling surface corresponding to the air outlet, ensuring the flow of indoor air from the floor to the ceiling, and hindering the diffusion of contaminated air in the horizontal direction. The airflow control device is installed on, for example, a table, sucks ambient contaminated air, blows it out as a rising airflow toward the ceiling, and discharges it from the air suction port.

However, such an air cleanliness maintenance system may cause cigarette smoke (dust) to diffuse back into the room before the rising airflow from the airflow control device reaches the discharge port.

In the present invention, when a smoker and a companion (for example, a non-smoker) face each other at a relatively close position across a table in the smoking room, the smoke discharged from the smoker is reduced while suppressing the ventilation amount of the entire smoking room. Provided is a method for ventilating a smoking room in which the discharged smoke can be efficiently carried to an exhaust port and discharged before reaching a companion who faces the person.

According to an aspect of the present invention, an air supply port provided on the floor or in the vicinity of the floor, an exhaust port provided on the ceiling or in the vicinity of the ceiling, a table installed on the floor and facing a person sitting on the floor, and a person sitting on the floor A method for ventilating a smoking room provided with a strip-shaped air outlet formed in the table so as to be parallel or substantially parallel to a direction perpendicular to the facing direction,
A step of generating a gentle updraft by supplying air from the air supply port near the floor or near the floor;
Exhausting the updraft through the ceiling or an exhaust port near the ceiling; and blowing the heated air upward from the strip-shaped outlet of the table;
A method of ventilating a smoking room is provided in which the heated air has a temperature higher than the temperature of the ceiling or the vicinity of the ceiling without air blowing from the table.

FIG. 1 is a top view showing a smoking room for verifying removal of dust caused by cigarette smoke. FIG. 2 is a cross-sectional view of FIG. FIG. 3 is a partial cross-sectional view of a table having an air blowing function installed in the smoking room of FIG. FIG. 4 is a diagram showing the results of tobacco dust concentration by the ventilation method of Test Examples 1 to 3. FIG. 5 is a diagram showing the tobacco dust concentration in the vicinity of the table in Test Examples 1 and 2. FIG. 6 is a diagram showing a temperature distribution from the floor to the ceiling in underfloor ventilation. FIG. 7 is a diagram showing a temperature distribution from the floor to the ceiling in replacement ventilation. FIG. 8 is a diagram showing an event when a table is blown out into a smoking room having a temperature distribution from the floor toward the ceiling. FIG. 9 is a diagram showing the temperature distribution in the smoking room and the effect of heating the table outlet. FIG. 10 is a partial cross-sectional view of a table having a heated air blowing function installed in the smoking room of FIG. FIG. 11 is a graph showing the results of tobacco dust concentrations by the ventilation methods of Examples 1 and 2 and Comparative Examples 1 to 3. FIG. 12 is a diagram showing the results of tobacco dust concentration by the ventilation method of Example 3 and Comparative Examples 4 and 5.

Hereinafter, the ventilation method of the smoking room according to the embodiment will be described in detail.

The ventilation method of the smoking room according to the embodiment includes an air supply port provided near the floor or near the floor, an exhaust port provided near the ceiling or near the ceiling, a table installed on the floor and facing a person sitting on the floor, This is a method of ventilating a smoking room provided with a strip-shaped outlet formed in the table so as to be parallel or substantially parallel to a direction perpendicular to a direction in which a person sitting is facing. First, a gentle updraft is generated in the smoking room by supplying air from the air inlet near the floor or near the floor. The updraft is exhausted through the ceiling or an outlet near the ceiling. During the ventilation of the smoking room by supplying and exhausting air, the heated air is blown out upward from a belt-like outlet of a table installed in the smoking room.

Here, the band-shaped outlet is `` formed on the table so as to be substantially parallel to '' the direction perpendicular to the person facing the person sitting on the basis of the line parallel to the direction perpendicular to the person facing the person sitting. This means that the table is formed in a state tilted by −10 to + 10 ° with respect to the reference line.

The ventilation system using the air supply and exhaust is as follows: (a) An underfloor ventilation system in which air-conditioned air is gently supplied from the indoor floor and exhausted from an exhaust port provided near the ceiling or near the ceiling; (b) on the floor A replacement ventilation system in which air conditioned air is gently supplied from the provided replacement ventilation air supply port and exhausted from an exhaust port provided near the ceiling or near the ceiling, (c) supplied from a louver provided near the floor, A third type ventilation system that exhausts air from an exhaust port provided on or near the ceiling can be employed.

The ascending air flow is preferably set to a flow rate of 0.01 to 0.02 m / s.

It is desirable that the number of ventilations per hour in the smoking room is 40 times or less, more preferably 15 to 25 times. If the number of ventilations per hour in a smoking room exceeds 40, ventilation frequency increases, ventilation equipment becomes large, and ventilation costs may increase.

It is preferable that the blowing speed of the heated air from the strip-shaped air outlet of the table be 0.6 m / s or more in order to block the smoke discharged by the smoker from reaching the accompanying person. It is more preferable that the blowing speed of the heated air is 1.2 m / s or more in consideration of fluctuations in the breathing height of the table and the smoker and fluctuations in the discharge speed. The upper limit of the blowing speed of the heated air is preferably 4 m / s.

¡The temperature of the heated air is set to be higher than the temperature at or near the ceiling without air blowing from the table. The heated air is preferably set at a temperature 2 to 10 ° C. higher than the temperature at or near the ceiling.

It is preferable to arrange the exhaust port provided on the ceiling directly above the heated air blowout.

In the ventilation method of such an embodiment, cigarette smoke (dust) in the smoking room is placed on the air flow by supplying air from the air inlet near the floor or near the floor and generating a gentle updraft in the smoking room. It can be carried to the exhaust port and exhausted for ventilation. In addition, when a smoker and a companion (for example, a non-smoker) face each other at a relatively close position across the table in the smoking room, the smoke discharged from the smoker faces due to a heated blow-off flow from the belt-shaped outlet of the table. It is possible to block the smoke before reaching the accompanying person, and at the same time, efficiently discharge the discharged smoke to the exhaust port. Furthermore, the discharged smoke can be discharged smoothly without increasing the ventilation amount of the entire smoking room.

The ventilation method of the smoking room according to the embodiment having such an effect was investigated and found through the following tests.

FIG. 1 is a top view showing a smoking room for verifying the removal of dust caused by cigarette smoke, and FIG. 2 is a cross-sectional view of FIG.

Smoking room 1 has a floor 2 with an underfloor air supply structure. On the floor 2, a plurality of, for example, two tables 3a and 3b are arranged. A total of eight thermal mannequins 4 are installed on both sides of the floor 2 with the tables 3a and 3b interposed therebetween. One thermal mannequin 4 is also installed in front of the two tables 3a and 3b. That is, a total of nine thermal mannequins 4 are installed on the floor 2 of the smoking room 1. The thermal mannequin 4 has a heat generation function (heat generation amount: 100 W / body) assuming that a person stays in the room. The sidestream smoke / discharge smoke generator 5 is disposed on the thermal mannequin 4 at the left back of the right table 3b. A plurality of, for example, three exhaust ports 6 are arranged on the ceiling 7 so as to be positioned immediately above the center of each table 3a, 3b and directly above the center between the tables 3a, 3b. On the ceiling 7, a fluorescent lamp for illumination is installed.

Each table 3a, 3b installed in the smoking room 1 has a box-shaped structure including a bottom plate 8, a top plate 9, and four side plates 10 as shown in FIG. The two rectifying

plates

11 a and 11 b are attached to the four side plates 10 in the tables 3 a and 3 b so as to be spaced apart from each other and parallel to the bottom plate 8. The air supply port 12 is opened in the side plate 10 portion located between the bottom plate 8 and the lower rectifying plate 11a. The suction fan 13 is disposed in communication with the air supply port 12 in the space between the bottom plate 8 and the lower rectifying plate 11a. The strip-shaped outlet 14 is formed in a direction perpendicular to the direction in which the thermal mannequin 4 faces the center of the top plate 9.

In the smoking room having such a structure, a gentle updraft is generated in the smoking room 1 by supplying fresh air from the under-floor air supply structure of the floor 2 of the smoking room 1. The ascending air current is exhausted through the exhaust port 5 of the ceiling 6. During ventilation of the smoking room 1 by supplying and exhausting air, the suction fan 13 of the tables 3a and 3b is operated to suck air from the smoking room 1 into the tables 3a and 3b from the air supply port 12. The sucked air is rectified while passing through the two rectifying

plates

11a and 11b from the space between the bottom plate 8 of the tables 3a and 3b and the lower rectifying plate 11a, and is blown out from the top plate 9 of the tables 3a and 3b. It blows out from the opening | mouth 14 as the strip-shaped blowing flow 15 toward the upper direction. This air blowing is called table blowing.

Preconditions for tobacco dust concentration in smoking rooms are as follows.

The smoking room 1 has an area of 18 m ² , a height of 2.7 m, and a volume of 48.6 m ³ .

In the sidestream smoke / discharge smoke generator 8, the flow rate of the discharged smoke was 1.7 m / s, and the flow rate of the discharged smoke was 2000 mL / time. The frequency was once per minute.

・ Dust measurement was performed with a piezo-balance dust meter.

・ Measurement points are 3 points of 1.4mm height (a, b, c in FIG. 1) assuming a breathing area with a person standing as a representative point of the smoking room 1, and a representative point near the table 3b Assuming a breathing area in a state where a person is sitting, three places (A, B, C in FIG. 1) having a height of 1.1 m were used.

<Test Example 1: Mixed ventilation>
The evaluation conditions are as follows.

・ Agitating in the smoking room: without underfloor air supply and table blowing, agitating with a cassette air conditioner (not shown) installed on the ceiling,
-Air exhaust speed from the ceiling exhaust port: 1.75 m / s.

<Test Example 2: Underfloor ventilation>
The evaluation conditions are as follows.

∙ Ventilation per hour by air supply from underfloor air supply structure and exhaust from ceiling exhaust port: 20 times.

<Test Example 3: Underfloor ventilation + Table blowout>
The evaluation conditions are as follows.

・ Air supply from the underfloor air supply structure, ventilation from the ceiling exhaust port per hour: 20 times
-Table blowing speed: 1.2 m / s.

Fig. 4 shows the results of the tobacco dust concentration by the ventilation method of Test Examples 1 to 3. Of the two adjacent bar graphs in FIG. 4, the left bar graph shows the average value of the measurement points A, B, and C near the table shown in FIG. 1, and the right bar graph shows the measurement of the smoking room shown in FIG. The average value of points a, b, and c is shown. The broken line in FIG. 4 shows the total average value of the measurement points A, B, C near the table and the measurement points a, b, c in the smoking room. Each average value of Test Examples 2 and 3 is expressed as a relative value (%) when the total average value in the mixed ventilation of Test Example 1 is 100.

FIG. 5 shows the tobacco dust concentration near the table in Test Examples 1 and 2. Of the three adjacent bar graphs in FIG. 5, the left bar graph is the measurement point A near the table shown in FIG. 1, the central bar graph is the measurement point B near the table, and the right bar graph is the measurement point C near the table. Indicates. The value of Test Example 2 is expressed as a relative value (%) when the corresponding value in the mixed ventilation of Test Example 1 is 100.

4 In the mixed ventilation of Test Example 1 from FIG. 4, the air in the smoking room is forcibly mixed, so the dust concentration in the vicinity of the table and the smoking room is almost the same value. On the other hand, in the underfloor ventilation of Test Example 2, the dust concentration in the smoking room decreases, but the dust concentration near the table increases. This is because the influence of discharged smoke cannot be reduced only by underfloor ventilation.

This will be described in detail with reference to FIG. In the mixed ventilation of Test Example 1, the measurement points A, B, and C show almost the same value. On the other hand, in the underfloor ventilation of Test Example 2, the dust concentration increases at measurement points B and C facing the sidestream smoke / discharge smoke generator which is a smoking area. From this, it can be understood that smoke discharged from the smoker forward cannot be prevented only by under-floor ventilation.

Again, the under-floor ventilation in Test Example 2 and the under-floor ventilation in Table 3 in the results of FIG. When table blowout is used in combination with underfloor ventilation, the dust concentration near the table is reduced compared to underfloor ventilation alone, which is effective in reducing tobacco smoke including discharged smoke. However, the dust concentration in the smoking room increases conversely. For this reason, when table blowout is used in combination with underfloor ventilation, table blowout affects the overall ventilation, and the dust concentration approximates that of mixed ventilation.

Underfloor ventilation and displacement ventilation in which the room is not forcibly stirred as in mixed ventilation, people stay in the room and equipment and lighting are installed, so that FIG. 6 (underfloor ventilation) and FIG. As shown in (Substitution ventilation), temperature distribution occurs from the floor to the ceiling.

The table blowout is intended to shield the smoke discharged from the smoker and facing the non-smoker, so it must be blown from below the breathing area of the person. In Test Example 3 described above, air is supplied from the lower air supply port 12 on the lower side of the tables 3a and 3b as shown in FIG. When underfloor ventilation or replacement ventilation is performed and a table is blown into a smoking room having the temperature distribution shown in FIG. 6 or FIG. 7, the following event occurs. That is, as shown in FIG. 8, the low-temperature air near the floor 2 is blown up to the high-temperature air layer 16 near the ceiling 7 by the blowout flow 15 from the table (for example, 3b). An exhaust port 6 is provided on the ceiling 7, but part of the low-temperature air blown up becomes a downward flow 17 before reaching the exhaust port 6. The blowout stream 15 contains a high concentration of tobacco smoke. For this reason, the cigarette smoke is lowered again by the descending flow 17, and the dust concentration in the breathing area of the smoking room 1 is increased. This indicates that the blowout flow from the table acts as a stirrer.

For this reason, the ventilation method according to the embodiment is applied in the ventilation in which a gentle updraft is generated in the smoking room by supplying air from the air inlet near the floor or near the floor, such as underfloor ventilation or replacement ventilation. By performing warm table blowing, the dust concentration in the breathing area of the smoking room can be reduced.

That is, the temperature distribution in the smoking room and the effect of heating the table blowing will be described with reference to FIG. As described above, the smoking room has a temperature distribution (temperature distribution line) in the height direction. When the air near the floor is blown up as it is toward the ceiling by blowing out the table, the low-temperature air reaches the high-temperature region and becomes a downward flow again. On the other hand, when the table blowout is preheated to a temperature near the ceiling, the air blown up by the table blowout stays in a high temperature area near the ceiling and can be smoothly exhausted from the exhaust port of the ceiling.

Therefore, in the embodiment, when the table blowout temperature is heated to a temperature near the ceiling or higher, a smoker and a companion (for example, a non-smoker) face each other at a relatively close position across the table in the smoking room. The blow-off flow can blow up and block the smoker before the smoke discharged by the smoker reaches the companion who faces him. At the same time, the air blown up together with the discharged smoke can be made to flow down and stay on the ceiling without returning to the smoking room and efficiently discharged from the exhaust port. As a result, it is possible to prevent an increase in the dust concentration in the smoking room due to the downward flow and reduce the dust concentration.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1, 2 and 10 described above.

Note that the preconditions for the tobacco dust concentration in the smoking rooms in Examples 1 to 3 and Comparative Examples 1 to 5 described below are as follows.

・ Dust measurement was performed with a piezo-balance dust meter.

・ Measurement points are three points of 1.4m height (a, b, c in FIG. 1) assuming a breathing area with a person standing as a representative point of smoking room 1, and a representative point near table 3b Assuming a breathing area in a state where a person is sitting, three places (A, B, C in FIG. 1) having a height of 1.1 m were used.

<Examples 1 and 2: Underfloor ventilation + heated table blowout>
Each table 3a, 3b installed in the smoking room 1 of FIGS. 1 and 2 has a box-shaped structure including a bottom plate 8, a top plate 9, and four side plates 10 as shown in FIG. The two rectifying

plates

11 a and 11 b are attached to the four side plates 10 in the tables 3 a and 3 b so as to be spaced apart from each other and parallel to the bottom plate 8. The air supply port 12 is opened in the side plate 10 portion located between the bottom plate 8 and the lower rectifying plate 11a. The suction fan 13 is disposed in communication with the air supply port 12 in the space between the bottom plate 8 and the lower rectifying plate 11a. A plurality of, for example, four incandescent balls 18 are arranged in the space between the bottom plate 8 and the lower rectifying plate 11a in order to heat the air in the space. The strip-shaped outlet 14 is formed in the center of the top plate 9 in a direction perpendicular to the facing direction of the thermal mannequin 4.

In the smoking room 1 having the structure shown in FIGS. 1 and 2, a gentle updraft is generated in the smoking room 1 by supplying fresh air from the underfloor air supply structure of the floor 2 of the smoking room 1. The ascending air current is exhausted through the exhaust port 5 of the ceiling 6. While the smoking room 1 is ventilated by air supply and exhaust, the incandescent bulb 18 in the tables 3a and 3b is heated, and the suction fan 13 is operated to draw the air in the smoking room 1 from the air supply port 12 to the tables 3a and 3b. Aspirate into. The sucked air is heated by the incandescent bulb 15 in the space between the bottom plate 8 and the lower rectifying plate 11a. The warmed air is rectified while passing through the two rectifying

plates

11b and 11a, and is blown upward as a zonal blowing flow 15 from the zonal blowing port 14 of the top plate 9 of the tables 3a and 3b. This warm air blow is called a warmed table blow.

The evaluation conditions are as follows.

・ Air supply from the underfloor air supply structure, ventilation from the ceiling exhaust port per hour: 20 times
-The speed of the heated table outlet: 1.2 m / s
-Temperature of the heated table outlet: Example 1 [Table air supply temperature (25 ° C) + Heating temperature (4 ° C)], Example 2 [Table air supply temperature (25 ° C) + Heating temperature ( 8 ° C.)].

Note that the ceiling temperature of the smoking room when the air is not blown from the table is 27 ° C.

<Comparative Example 1: Mixed ventilation>
The evaluation conditions are as follows.

<Comparative Example 2: Underfloor ventilation>
The evaluation conditions are as follows.

<Comparative Example 3: Underfloor ventilation + Table blowout>
The evaluation conditions are as follows.

FIG. 11 shows the result of the tobacco dust concentration by the ventilation methods of Examples 1 and 2 and Comparative Examples 1 to 3. Of the two adjacent bar graphs in FIG. 11, the left bar graph shows the average value of measurement points A, B, and C near the table shown in FIG. 1, and the right bar graph shows the measurement of the smoking room shown in FIG. The average value of points a, b, and c is shown. The broken line in FIG. 11 shows the total average value of the measurement points A, B, C near the table and the measurement points a, b, c in the smoking room. The average values of Examples 1 and 2 and Comparative Examples 2 and 3 are expressed as relative values (%) when the total average value in the mixed ventilation of Comparative Example 1 is 100.

As is clear from the results of FIG. 11, the dust in the smoking room, which is a problem with the non-heated table blowout (Comparative Example 3), is obtained by performing the warmed table blowout in the underfloor ventilation as in Examples 1 and 2. It can be seen that the dust concentration in the vicinity of the table can be reduced while suppressing the increase in concentration. In addition, comparing the total average of the dust concentration in the smoking room and the dust concentration in the vicinity of the table with Comparative Examples 1 to 3, the heated table blows out, so that the dust concentration is lower than with mixed ventilation (Comparative Example 1). It can be seen that it can be significantly reduced.

From the above, the dust concentration in the entire smoking room is reduced without increasing the ventilation volume compared with the mixed ventilation by using together the table outlet heated during the underfloor ventilation as in Examples 1 and 2. In addition, the influence of discharged smoke can be remarkably improved.

<Example 3: Replacement ventilation + heated table blowing>
・ Ventilation frequency per hour by air supply from the air supply port provided on the side wall near the floor and exhaust from the ceiling exhaust port: 20 times,
-The speed of the heated table outlet: 1.2 m / s
The temperature of the heated table outlet: the supply air temperature (24 ° C.) of the table + the heating temperature (8 ° C.).

The ceiling temperature of the smoking room when the air is not blown from the table is 26 ° C.

<Comparative Example 4: Mixed ventilation>
The evaluation conditions are as follows.

<Comparative Example 5: Replacement ventilation>
The evaluation conditions are as follows.

・ Ventilation frequency per hour by air supply from the air supply port provided on the side wall near the floor and exhaust from the ceiling exhaust port: 20 cigarettes by the ventilation method of Example 3 and Comparative Examples 4 and 5 The result of the dust concentration is shown in FIG. Of the two adjacent bar graphs in FIG. 12, the left bar graph shows the average value of the measurement points A, B, and C near the table shown in FIG. 1, and the right bar graph shows the measurement of the smoking room shown in FIG. Average values of points a, b, and c are shown. The broken line in FIG. 12 shows the total average value of the measurement points A, B, C near the table and the measurement points a, b, c in the smoking room. Each average value of Example 3 and Comparative Example 5 is expressed as a relative value (%) when the total average value in the mixed ventilation of Comparative Example 4 is 100.

As is clear from the results of FIG. 12, by performing table blowing heated in replacement ventilation as in Example 3, the dust concentration in the vicinity of the table and the dust concentration in the smoking room compared to replacement ventilation (Comparative Example 5). It can be seen that can be reduced. Moreover, when the total average of the dust density | concentration of a smoking room and the dust density | concentration of the table vicinity is compared, it turns out that a dust density | concentration can be reduced significantly compared with mixed ventilation (comparative example 4) by performing the heated table blowing.

From the above, by using together table ventilation heated during replacement ventilation as in Example 3, the dust concentration of the entire smoking room can be reduced without increasing the ventilation volume compared to mixed ventilation, The influence of the discharged smoke can be remarkably improved.

Claims

An air supply port provided on or near the floor, an exhaust port provided on the ceiling or near the ceiling, a table installed on the floor and facing a seated person, and a direction perpendicular to the direction facing the seated person Or a method for ventilating a smoking room with a strip-shaped outlet formed in the table so as to be substantially parallel,
Generating a gentle updraft by supplying air from the air inlet near the floor or near the floor;
Exhausting the updraft through the ceiling or the exhaust port near the ceiling; and blowing the heated air upward from the strip-shaped air outlet of the table;
The method for ventilating a smoking room, wherein the heated air has a temperature higher than a temperature at or near the ceiling in a state where no air is blown from the table.
The method for ventilating a smoking room according to claim 1, wherein the blowing of warm air from the table has a speed of 0.6 m / s or more.
The method for ventilating a smoking room according to claim 1, wherein the ventilation by the supply from the supply port and the exhaust from the exhaust port is underfloor ventilation.
The method of ventilating a smoking room according to claim 1, wherein ventilation by supply from the supply port and exhaust from the exhaust port is replacement ventilation.
The method for ventilating a smoking room according to claim 1, wherein ventilation by supply from the supply port and exhaust from the exhaust port is third-type ventilation using a louver.
The method for ventilating a smoking room according to claim 1, wherein the number of ventilations per hour by the supply from the supply port and the exhaust from the exhaust port is 40 times or less.