Draft control system and draft control method

Abstract

This invention provides a draft control system and draft control method that can achieve a good balance between draft prevention and a comfortable air-conditioned environment. [Solution] A draft control system 10 for suppressing and controlling the draft phenomenon in a vertical shaft space 14 provided inside a building 12, comprising: a temperature control means 18 provided at the lower part of the building 12 for temperature-regulating outdoor air; an air supply fan 20 for supplying the temperature-regulating air to the lower part of the vertical shaft space 14; an exhaust fan 22 provided at the upper part of the building for exhausting the air from the upper part of the vertical shaft space 14 to the outside; and a control device 24, wherein the control device 24 controls at least one of the air supply volume by the air supply fan 20 and the exhaust volume by the exhaust fan 22 in order to reduce the pressure difference between the pressure at the lower part of the vertical shaft space 14 and the outside air pressure.

Description

[[Technical Field]]

[0001] The present invention relates to a draft control system and a draft control method for reducing a draft phenomenon occurring in an elevator hoistway or the like of a building. [[Background Art]]

[0002] Conventionally, in a super high-rise building, a temperature difference between the inside and outside of the building becomes large in winter, so that a pressure gradient is generated by a pressure difference with the outside in a narrow and high-rise vertical shaft space such as an elevator hoistway (ELV shaft).

[0003] Fig. 3(1) shows an example of an air flow generated inside a building 1 by a pressure gradient. Fig. 3(2) shows an example of a pressure gradient with respect to the outside air in the ELV shaft 2. Fig. 3(3) shows an example of a temperature distribution in the ELV shaft 2.

[0004] As shown in Fig. 3(1), on the lower floors of the building 1, an air flow from the outside toward the vertical shaft space is generated, and on the higher floors, an air flow from the vertical shaft space toward the outside is generated. This is generally called the building draft phenomenon. For this reason, noise generated by a door (e.g., an elevator door) existing on the path of the air flow, and opening / closing failures become problems in terms of convenience. Furthermore, on the ground floor connected to the outdoors, when a door is opened for people entering and exiting from the outdoors, a large amount of cold outdoor air flows into the building in winter due to the draft phenomenon, and in summer, the cold air inside the building flows out to the outside. For this reason, the air conditioning efficiency inside the building decreases, resulting in an increase in energy consumption and an increase in running costs.

[0005] As a countermeasure against such a draft phenomenon, there is generally a method of blocking the air flow and reducing the problem by adding a normally closed door with high airtightness to the air flow path connecting the elevator hall, the stairs, and the outdoor entrance / exit. However, there are problems that the increase in the number of doors reduces convenience, and a plurality of doors are opened simultaneously during hours of heavy pedestrian traffic, which reduces the effect of the countermeasure.

[0006] Another known countermeasure is the method described in Patent Document 1. This is a draft countermeasure that focuses on noise and opening / closing malfunctions, and involves directly introducing low-temperature outside air (cold air) into the ELV shaft using a fan or the like to lower the temperature inside the ELV shaft, thereby suppressing the resulting buoyancy and reducing the draft effect. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 7-330247 [Overview of the project] [Problems that the invention aims to solve]

[0008] However, the method described in Patent Document 1 above has the following problems. These problems will be explained with reference to Figure 4.

[0009] Figure 4(1) is a schematic diagram of the airflow when the cold air introduction method described in Patent Document 1 is applied to an actual building 1. Figure 4(2) is an example of the change in the pressure gradient in the ELV shaft 2 due to the introduction of cold air. Figure 4(3) is an example of the temperature distribution inside the ELV shaft 2 due to the introduction of cold air. In Figures 4(2) and (3), the case without cold air introduction is shown by a dashed line.

[0010] As shown in Figure 4(2), in the cold air introduction method of Patent Document 1, the pressure difference between the air in the ELV shaft 2 and the outside air is suppressed by cooling, and the pressure difference between the ELV shaft 2 and the outside approaches zero. However, because the lower floors of the ELV shaft 2 are under negative pressure, there is a risk that warm air from inside the room will flow into the elevator hall.

[0011] Furthermore, as shown in Figures 4(1) and (3), the lower the outside temperature, the lower the temperature near the entrance 3 of the ELV shaft 2, which causes condensation on the elevator landing doors and the surface of the elevator car walls that ascend and descend the ELV shaft 2. In addition, there are problems such as the temperature rising to near room temperature in the upper floor 4 due to heat radiation from the ELV shaft walls and the inflow of heated warm air from the elevator doors.

[0012] One possible solution to this problem is to introduce a large volume of outside air to increase the effect of reducing the draft phenomenon. However, with this method, the ambient temperature around the point where the outside air is introduced may drop too low, potentially causing discomfort to elevator users in addition to the problems mentioned above.

[0013] The present invention has been made in view of the above, and aims to provide a draft control system and a draft control method that can achieve a good balance between draft control and a comfortable air-conditioned environment. [Means for solving the problem]

[0014] To solve the above-mentioned problems and achieve the objective, the draft control system according to the present invention is a draft control system for suppressing and controlling the draft phenomenon in a vertical shaft space provided in a building, comprising: an outside air inlet provided in the lower part of the building for introducing outside air; a temperature control means for temperature-regulating the introduced air; an air supply fan for supplying the temperature-regulating air to the lower part of the vertical shaft space; an exhaust fan provided in the upper part of the building for exhausting the air from the upper part of the vertical shaft space to the outside; and a control device for controlling the temperature control means, the air supply fan, and the exhaust fan, wherein the control device controls at least one of the air supply volume by the air supply fan and the exhaust volume by the exhaust fan so as to reduce the pressure difference between the pressure at the lower part of the vertical shaft space and the outside air pressure.

[0015] Furthermore, another draft control system according to the present invention is characterized in that, in the above-described invention, the control device controls the temperature of the air supplied by the air supply fan so as to reduce the temperature difference between the temperature at the bottom of the vertical shaft space and the temperature inside the building outside the vertical shaft space.

[0016] Furthermore, the draft control method according to the present invention is a draft control method for suppressing and controlling the draft phenomenon in a vertical shaft space provided in a building, and is characterized by comprising the steps of: adjusting the temperature of outdoor air introduced from an outside air inlet provided in the lower part of the building using a temperature adjustment means, and supplying the adjusted air to the lower part of the vertical shaft space using an air supply fan; exhausting the air from the upper part of the vertical shaft space to the outside using an exhaust fan provided in the upper part of the building; and controlling at least one of the air supply volume by the air supply fan and the exhaust volume by the exhaust fan so as to reduce the pressure difference between the pressure at the lower part of the vertical shaft space and the outside air pressure.

[0017] Furthermore, another draft control method according to the present invention is characterized in that, in the invention described above, the temperature of the air supplied by the air supply fan is controlled in such a way that the temperature difference between the temperature at the bottom of the vertical shaft space and the temperature inside the building outside the vertical shaft space is reduced. [Effects of the Invention]

[0018] The draft control system according to the present invention is a draft control system for suppressing and controlling the draft phenomenon in a vertical shaft space provided in a building, comprising: an outside air inlet provided in the lower part of the building for introducing outside air; a temperature control means for temperature-regulating the introduced air; a supply air fan for supplying the temperature-regulating air to the lower part of the vertical shaft space; an exhaust fan provided in the upper part of the building for exhausting the air from the upper part of the vertical shaft space to the outside; and a control device for controlling the temperature control means, the supply air fan, and the exhaust fan, wherein the control device controls at least one of the supply air volume by the supply air fan and the exhaust air volume by the exhaust fan so as to reduce the pressure difference between the pressure at the lower part of the vertical shaft space and the outside air pressure, thereby suppressing the inflow of excessive cold air into the building from doors leading to the outside and the outflow of excessive cold air from the building to the outside, and improving air conditioning efficiency. Therefore, it has the effect of achieving a good balance between draft countermeasures in the vertical shaft space and a comfortable air-conditioned environment inside the building.

[0019] Furthermore, according to another draft control system of the present invention, the control device controls the temperature of the air supplied by the air supply fan so as to reduce the temperature difference between the temperature at the bottom of the vertical shaft space and the temperature inside the building outside the vertical shaft space, thereby having the effect of suppressing the occurrence of condensation.

[0020] Further, according to the draft control method of the present invention, there is provided a draft control method for suppressing and controlling the draft phenomenon in a vertical shaft space provided in a building, the method comprising the steps of: temperature-adjusting outdoor air introduced from an outside air inlet provided at a lower portion of the building by a temperature adjustment means, and supplying the temperature-adjusted air to a lower portion of the vertical shaft space by an air supply fan; exhausting air from an upper portion of the vertical shaft space to the outside by an exhaust fan provided at an upper portion of the building; and controlling at least one of an air supply volume by the air supply fan and an exhaust air volume by the exhaust fan so as to reduce a pressure difference between a pressure at the lower portion of the vertical shaft space and an outside air pressure. Therefore, excessive inflow of cold air into the building from a door or the like leading to the outside and excessive outflow of cold air from the building to the outside can be suppressed, and air conditioning efficiency can be improved. Accordingly, the invention has the effect of achieving a good balance between draft countermeasures for the vertical shaft space and a comfortable air conditioning environment in the building.

[0021] Further, according to another draft control method of the present invention, the supply air temperature from the air supply fan is controlled so as to reduce the temperature difference between the temperature at the lower portion of the vertical shaft space and the temperature inside the building outside the vertical shaft space, thereby achieving the effect of suppressing the occurrence of condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] [Figure 1] Fig. 1 is a schematic configuration diagram showing an embodiment of a draft control system according to the present invention. [Figure 2] Fig. 2 is an explanatory diagram illustrating the effect of the present invention. [Figure 3] Fig. 3 is an explanatory diagram illustrating the draft phenomenon. [Figure 4] Fig. 4 is an explanatory diagram illustrating a conventional draft suppression effect. DESCRIPTION OF EMBODIMENTS

[0023] Hereinafter, embodiments of a draft control system and a draft control method according to the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited by this embodiment.

[0024] As shown in Figure 1, the draft control system 10 according to an embodiment of the present invention is a system for suppressing and controlling the draft phenomenon in an elevator shaft 14 (vertical shaft space) provided over multiple floors in a high-rise building 12, and comprises an outside air inlet 16, a temperature control means 18, an air supply fan 20, an exhaust fan 22, temperature sensors TH1 to TH4, pressure sensors P1 to P4, and a control device 24.

[0025] The outside air inlet 16 is located at the bottom of the building 12 and introduces outside air (cold outdoor air) into the building 12. The outside air inlet 16 is connected to an outside air duct 30 located in a room 28 next to the elevator pit 26 on the lowest floor. The outside air duct 30 is equipped with an outside air damper 32, which consists of a motor damper that adjusts the airflow of the outside air OA taken in by the supply air fan 20. The outside air OA introduced from the outside air inlet 16 is supplied to the supply air duct 34 through the outside air duct 30 and the outside air damper 32.

[0026] The temperature control means 18 is installed in the room 28 and controls the temperature of the outside air OA introduced through the outside air duct 30. It includes an exhaust duct 36 branched from the exhaust system of a heat source receiving room (not shown). The exhaust duct 36 is connected to the supply air duct 34 between the supply air fan 20 and the outside air damper 32, supplying warm air EA from the room 28 to the supply air duct 34. The exhaust duct 36 is equipped with an exhaust damper 38, which consists of a motor damper that adjusts the airflow rate of the warm air EA taken in by the supply air fan 20. The temperature control means 18 can control the temperature of the outside air OA to an appropriate level by mixing the warm air EA from the room 28 supplied from the exhaust duct 36 with the outside air OA supplied from the outside air duct 30 upstream of the supply air fan 20, and supply it to the supply air duct 34.

[0027] The supply air fan 20 is installed in the supply air duct 34 of the room 28 and takes in temperature-controlled air and supplies it to the lower part of the ELV shaft 14. The airflow rate of the supply air fan 20 is controlled by the control device 24. By mixing the outside air OA (e.g., -8°C) and the indoor warm air EA (e.g., 22°C) with the supply air fan 20 and supplying air at an appropriate temperature (e.g., 8°C) to the lower part of the ELV shaft 14, the dew point temperature inside the ELV shaft 14 can be controlled and condensation inside the ELV shaft 14 can be prevented.

[0028] The exhaust fan 22 is installed in the exhaust duct 42 of the elevator machine room 40 on the top floor of the building 12, and exhausts the air from the top of the ELV shaft 14 to the outside. The exhaust air volume of the exhaust fan 22 is controlled by the control device 24. The exhaust fan 22 may be an enhanced version of an existing exhaust fan or an existing smoke exhaust fan.

[0029] Temperature sensors TH1 to TH4 are installed in the lower, middle, and upper parts of the elevator shaft 14 to detect the temperature at each location. Specifically, temperature sensor TH1 is installed in the room 28, and temperature sensor TH2 is installed in the elevator pit 26. Temperature sensor TH3 is installed in the middle section of the elevator shaft 14, and temperature sensor TH4 is installed directly below the elevator machine room 40. The detected values ​​from temperature sensors TH1 to TH4 are transmitted to the control device 24 for monitoring.

[0030] Pressure sensors P1 to P4 are installed on the inside and outside of the lower and upper parts of the ELV shaft 14, and detect the pressure at each location. Specifically, pressure sensor P1 is installed in the room 28, and pressure sensor P2 is installed inside the ELV shaft 14. Pressure sensors P1 and P2 are at the same height. Pressure sensor P3 is installed in the room 44 on the top floor where the elevator lands, and pressure sensor P4 is installed directly below the elevator machine room 40. Pressure sensors P3 and P4 are at the same height. By arranging them in this way, it is possible to obtain the differential pressure between the inside and outside of the upper and lower parts of the ELV shaft 14, and the pressure gradient inside the ELV shaft 14. The detected values ​​from pressure sensors P1 to P4 are transmitted to the control device 24 and can be monitored.

[0031] The control device 24 is located in the room 28 and controls the supply air temperature, supply air volume, and exhaust air volume of the exhaust fan 22 supplied by the supply air fan 20 based on the detection values ​​of temperature sensors TH1 to TH4 and pressure sensors P1 to P4. Specifically, the control device 24 controls the supply air temperature by adjusting the opening degrees of the outside air damper 32 and the exhaust damper 38, respectively, using inverter control to change the ratio of warm air EA to outside air OA. The control device 24 also controls the supply air volume and exhaust air volume by adjusting the motor speeds of the supply air fan 20 and the exhaust fan 22, respectively, using inverter control.

[0032] Here, temperature sensors TH1-TH4 and pressure sensors P1-P4 provide the temperature, pressure, temperature change, and pressure change inside and outside the elevator shaft 14 due to the temperature-controlled air. The control device 24 sets command values ​​based on the obtained values ​​and controls the supply air temperature, supply air volume, and exhaust air volume with these command values. As a result, the temperature and pressure inside the elevator shaft 14 are controlled, and the draft phenomenon is suppressed. In addition, the air conditioning efficiency of the building 12 is improved.

[0033] It is desirable to determine the optimal command values ​​in advance by evaluating the draft reduction effect and the impact on the building's air conditioning environment. For example, when planning the introduction of the draft control system 10, experiments and simulations may be conducted in advance to set values ​​that provide a draft reduction effect and an improvement in the building's air conditioning environment for the outside temperature, outside air pressure (atmospheric pressure), indoor temperature, pressure, temperature, pressure, temperature change, and pressure change inside the elevator shaft during control. Note that the pressure and pressure gradient inside the elevator shaft 14 change with the outside air temperature and may not be similar to the results of the simulation during planning. After the introduction of the draft control system 10, it is desirable to monitor the detected values ​​of temperature sensors TH1 to TH4 and pressure sensors P1 to P4, and use these to perform simulations again to adjust the command values ​​and make it possible to adjust the draft countermeasures.

[0034] Furthermore, in order to sufficiently reduce the pressure gradient within the ELV shaft 14, it is necessary to lower the temperature up to near the top of the ELV shaft 14. It is desirable to enhance the performance of the exhaust fan 22 and forcibly draw in the low-temperature air that has flowed into the lower part of the ELV shaft 14 to reduce the temperature difference between the top and bottom.

[0035] The balance of airflow between the supply fan 20 and the exhaust fan 22 is preferably controlled by creating a difference in airflow so that the exhaust airflow is smaller than the supply airflow. This increases the pressure throughout the elevator shaft 14, reducing the difference between the pressure at the pressure sensor P2 in the elevator shaft 14 near the ground floor and atmospheric pressure (the pressure at the indoor pressure sensor P1), thereby reducing the pressure gradient. For example, the exhaust fan 22 may be operated once per hour, and the supply fan 20 may be operated twice per hour to create a difference in airflow. In this control, the difference between the pressure at pressure sensor P2 and the pressure at pressure sensor P1 may be reduced to, for example, 10 Pa or less. In this way, excessive inflow of cold air from the entrance door leading to the outside can be suppressed, and the heating efficiency inside the building 12 can be improved.

[0036] Although the elevator car (not shown) normally has a ventilation system that exchanges air between the ELV shaft 14 and the car, in reality, the air between the landing and the car is exchanged only by people getting on and off. Therefore, during the coldest period when the temperature of the entire ELV shaft 14 drops, it is preferable to operate with this ventilation system turned off.

[0037] Furthermore, during the summer, a draft phenomenon occurs where the cooled air inside the building 12 descends through the elevator shaft 14 and flows out to the outside. In this case, the airflow of the supply fan 20 and the exhaust fan 22, as well as the supply air temperature, are controlled to reduce the pressure difference between the inside and outside at the bottom of the elevator shaft 14. By doing so, excessive outflow of cool air from the entrance doors of the building 12 to the outside is suppressed, and the cooling efficiency inside the building 12 can be improved.

[0038] According to the draft control system 10 of this embodiment, outside air OA is temperature-controlled and supplied to the lower part of the ELV shaft 141, thereby changing the temperature and pressure inside the ELV shaft 14. This suppresses the draft phenomenon in the ELV shaft 14, and reduces common draft problems such as wind noise from the door and opening / closing problems.

[0039] Therefore, it becomes possible to reduce the number of doors that were previously installed on the ground floor, improving convenience and creating a more open space. In addition, it is possible to prevent gusts of wind when doors leading to the outside are opened, and collisions and entrapment accidents caused by doors opening or closing unexpectedly due to wind pressure. Furthermore, by reducing the amount of air drawn from inside the building 12 into the elevator shaft 14, it is possible to prevent situations such as odors emitted from restaurants near elevators on lower floors spreading to upper floors through the elevator shaft 14.

[0040] Furthermore, by monitoring the pressure difference inside and outside the ELV shaft 14 and controlling the supply and exhaust volume and temperature in real time, it is possible to improve the air conditioning environment to suit efficient operation and operational needs. For example, in winter, the inflow of outside air into the building 12 can be reduced, improving heating efficiency. In summer, the outflow of cooled air to the outside of the building 12 can be reduced, improving cooling efficiency. As a result, energy savings can be achieved throughout the year, reducing electricity costs and the environmental impact.

[0041] Furthermore, by controlling the temperature inside the ELV shaft 14 to exceed the dew point temperature, internal condensation can be suppressed. This reduces discomfort for elevator users.

[0042] Furthermore, while mechanical equipment such as elevators may have a minimum operating temperature of -5°C, in this embodiment, the temperature inside the ELV shaft 14 can be controlled to be above -5°C, so it can be applied without problems even when the ambient temperature falls below -5°C in cold regions.

[0043] Based on the above, this embodiment makes it possible to achieve a good balance between draft prevention in the elevator shaft 14 and a comfortable air-conditioned environment inside the building 12.

[0044] (Supplementary explanation of effects and benefits) Next, we will provide a supplementary explanation regarding the effects and benefits of the present invention. Figure 2(1) is a schematic diagram of the airflow when this embodiment is applied. Figure 2(2) is an example of the change in the pressure gradient in the ELV shaft. Figure 2(3) is an example of the temperature distribution inside the ELV shaft. Figures 2(2) and (3) show graphs of the case when draft countermeasures are implemented according to this embodiment (Example 1), when no draft countermeasures are implemented (Comparative Example 1), and when draft countermeasures are implemented according to the above-mentioned Patent Document 1 (Comparative Example 2).

[0045] As shown in Figure 2(1), this embodiment controls the supply air temperature at the bottom of the ELV shaft 14 to prevent localized overcooling, while simultaneously cooling the ELV shaft 14 from the bottom to the top by exhaust from the elevator machine room 40. Furthermore, by increasing the pressure of the entire ELV shaft 14, the pressure inside the ELV shaft 14 near the ground floor is brought closer to the outside air pressure, suppressing the inflow of outside air into the building. In addition, the temperature inside the ELV shaft 14 near the ground floor is made higher than the dew point temperature.

[0046] According to this embodiment 1, as shown in Figure 2(2), by bringing the pressure inside the elevator shaft 14 near the ground floor closer to the outside air pressure, the inflow of outside air into the building can be suppressed compared to comparative examples 1 and 2. Furthermore, according to this embodiment 1, as shown in Figure 2(3), by making the temperature inside the elevator shaft 14 near the ground floor higher than the dew point temperature, condensation inside the elevator shaft 14 near the ground floor can be suppressed compared to comparative examples 1 and 2.

[0047] As described above, the draft control system according to the present invention is a draft control system for suppressing and controlling the draft phenomenon in a vertical shaft space provided in a building, comprising: an outside air inlet provided in the lower part of the building for introducing outside air; a temperature control means for temperature-regulating the introduced air; an air supply fan for supplying the temperature-regulating air to the lower part of the vertical shaft space; an exhaust fan provided in the upper part of the building for exhausting the air from the upper part of the vertical shaft space to the outside; and a control device for controlling the temperature control means, the air supply fan, and the exhaust fan. The control device controls at least one of the air supply volume by the air supply fan and the exhaust volume by the exhaust fan so as to reduce the pressure difference between the pressure at the lower part of the vertical shaft space and the outside air pressure. This suppresses the inflow of excessive cold air into the building from doors leading to the outside and the outflow of excessive cold air from the building to the outside, thereby improving air conditioning efficiency. Therefore, it is possible to achieve a good balance between draft countermeasures in the vertical shaft space and a comfortable air-conditioned environment inside the building.

[0048] Furthermore, according to another draft control system of the present invention, the control device controls the temperature of the air supplied by the air supply fan so as to reduce the temperature difference between the temperature at the bottom of the vertical shaft space and the temperature inside the building outside the vertical shaft space, thereby suppressing the occurrence of condensation.

[0049] Furthermore, the draft control method according to the present invention is a draft control method for suppressing and controlling the draft phenomenon in a vertical shaft space provided in a building, and includes the steps of: adjusting the temperature of outdoor air introduced from an outside air inlet provided in the lower part of the building using a temperature adjustment means, and supplying the adjusted air to the lower part of the vertical shaft space using an air supply fan; exhausting the air from the upper part of the vertical shaft space to the outside using an exhaust fan provided in the upper part of the building; and controlling at least one of the air supply volume by the air supply fan and the exhaust volume by the exhaust fan so as to reduce the pressure difference between the pressure at the lower part of the vertical shaft space and the outside air pressure. As a result, it is possible to suppress the inflow of excessive cold air into the building from doors leading to the outside and the outflow of excessive cold air from the building to the outside, thereby improving air conditioning efficiency. Therefore, it is possible to achieve a good balance between countermeasures against drafts in vertical shaft spaces and a comfortable air-conditioned environment inside the building.

[0050] Furthermore, according to another draft control method of the present invention, the temperature of the air supplied by the air supply fan is controlled to reduce the temperature difference between the temperature at the bottom of the vertical shaft space and the temperature inside the building outside the vertical shaft space, thereby suppressing the occurrence of condensation.

[0051] Furthermore, the "Sustainable Development Goals (SDGs)" are among the 17 international goals adopted at the UN Summit in September 2015. The draft control system and draft control method according to this embodiment can contribute to achieving some of the 17 SDGs, such as goal 12, "Responsible Consumption and Production." [Industrial applicability]

[0052] As described above, the draft control system and draft control method according to the present invention are useful for draft control in high-rise buildings, and are particularly suitable for achieving a good balance between draft control and a comfortable air-conditioned environment. [Explanation of Symbols]

[0053] 10. Draft control system 12 buildings 14 ELV shaft (vertical hole space) 16. Outdoor air intake 18 Temperature control means 20 Intake Fan 22 Exhaust fan 24 Control device 26 Elevator Pit 28,44 Indoor 30 Outdoor air duct 32. Outside air damper 34. Air supply duct 36,42 Exhaust duct 38 Exhaust damper 40 Elevator Machine Room P1-P4 Pressure Sensors TH1~TH4 Temperature Sensor

Claims

1. A draft control system for suppressing and controlling the draft phenomenon in vertical shaft spaces provided within a building, The building is provided with an outside air inlet for introducing outside air, a temperature control means for adjusting the temperature of the introduced air, and an air supply fan for supplying the temperature-controlled air to the lower part of the vertical shaft space. An exhaust fan is provided at the top of the building to exhaust the air from the top of the vertical shaft space to the outside, The system comprises the aforementioned temperature control means, the aforementioned air supply fan, and a control device for controlling the aforementioned exhaust fan, The control device controls at least one of the supply airflow rate by the supply air fan and the exhaust airflow rate by the exhaust fan in order to reduce the pressure difference between the pressure at the bottom of the vertical shaft space and the outside air pressure.

2. The draft control system according to claim 1, characterized in that the control device controls the temperature of the air supplied by the air supply fan so as to reduce the temperature difference between the temperature at the bottom of the vertical shaft space and the temperature inside the building outside the vertical shaft space.

3. A draft control method for suppressing and controlling the draft phenomenon in a vertical shaft space provided within a building, The process involves taking outside air introduced from an outside air inlet located at the bottom of the building, adjusting its temperature using a temperature control means, and supplying the conditioned air to the lower part of the vertical shaft space using an air supply fan. A step of exhausting the air from the upper part of the vertical shaft space to the outside using an exhaust fan installed at the top of the building, A draft control method characterized by comprising the step of controlling at least one of the supply air volume by the supply air fan and the exhaust air volume by the exhaust fan so as to reduce the pressure difference between the pressure at the bottom of the vertical shaft space and the outside air pressure.

4. The draft control method according to claim 3, characterized in that the temperature of the air supplied by the air supply fan is controlled so as to reduce the temperature difference between the temperature at the bottom of the vertical shaft space and the temperature inside the building outside the vertical shaft space.

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