Blower control apparatus for controlling the blower of a smoke exhaust system that uses a stairwell as a wind path and the operating method thereof

Abstract

The present invention provides a blower control device and a method of operation for controlling a blower in a smoke control system that utilizes a stairwell as a wind tunnel, thereby supporting effective smoke control in the event of a fire within a building.

Description

Technology Field

[0001] The present invention relates to a blower control device and a method of operation for controlling a blower in a smoke control system that utilizes a stairwell as a wind tunnel. Background Technology

[0002] Buildings are often equipped with a designated smoke control system to exhaust smoke in the event of a fire.

[0003] In this regard, as shown in the figure in FIG. 1, a blower (10) may be provided in a predetermined fan room of the building, and a smoke control damper device (11) may be provided in an annex room (22) on each floor of the building. In this case, in the existing smoke control system, the smoke control damper device (11) is configured to be installed on the wall between the annex room (22) and the elevator passage (21) on each floor, as shown in the figure in FIG. 1. In this situation, the blower (10) uses the elevator passage (21) as a wind path to supply wind to the smoke damper device (11) provided on each floor, and normally the smoke damper device (11) is kept closed, but when a fire occurs in the building, the blower (10) is driven and the smoke damper device (11) is opened, so that the wind supplied from the blower (10) through the elevator passage (21) is supplied to the auxiliary room (22) on each floor.

[0004] When air is supplied to the auxiliary room (22) in this way, smoke from a fire inside the building does not enter the auxiliary room (22), so that people who have evacuated to the auxiliary room (22) can be prevented from suffocating due to the smoke.

[0005] In the existing smoke control system, as described above, the smoke control damper device (11) is configured to be installed on the wall between the auxiliary room (22) and the elevator passage (21) of each floor, and the blower (10) is configured to use the elevator passage (21) as a winding path to supply air to the smoke control damper device (11) provided on each floor. However, if the elevator passage (21) is used as a winding path in this way, it may be difficult to properly prepare for fire in that the operation of the blower (10) or the smoke control damper device (11) must be stopped for safety reasons when a situation arises where the inside of the elevator passage (21) needs to be inspected. Additionally, if the elevator is in operation during the air supply, there may be a problem in that air is not properly supplied to the smoke control damper device (11) on each floor due to the piston effect inside the winding path.

[0006] One of the solutions to this problem is to consider a method in which the air passage through which the air supplied from the blower (10) is transmitted is made to be the stairwell of the building rather than the elevator passage (21).

[0007] Specifically, by installing a smoke damper device (11) on the wall between the auxiliary room (22) and the stairwell of each floor of the building, a method can be introduced in which the wind supplied from the blower (10) is transmitted to the smoke damper device (11) of each floor using the stairwell as a wind path.

[0008] However, if a smoke control system of this type is introduced, a situation may occur where the pressure in the stairwell of a specific floor becomes higher than the pressure in the annex room (22), and if the pressure in the stairwell becomes excessively higher than the pressure in the annex room (22), people may not be able to open the door leading from the annex room (22) to the stairwell, and thus a problem may arise where people cannot properly evacuate.

[0009] For example, if a fire occurs in a building, people in the interior (23) of each floor will come out to the auxiliary room (22), then move back to the stairwell connected to the auxiliary room (22), and evacuate by moving to the lower floor through the stairwell. At this time, while the blower (10) is supplying air to the auxiliary room (22) through the smoke damper device (11) of each floor using the stairwell as a fan, if a person in the interior (23) opens the door connecting the auxiliary room (22) and the interior (23) to come out to the auxiliary room (22), the air present in the auxiliary room (22) flows into the interior (23), causing the pressure in the auxiliary room (22) to drop momentarily, and this can result in a situation where the pressure in the stairwell becomes higher than the pressure in the auxiliary room (22).

[0010] When a situation occurs where the pressure in the stairwell becomes higher than the pressure in the annex (22), a person who has come out of the annex (22) may encounter a problem where they cannot properly open the door connecting the annex (22) and the stairwell to come back out to the stairwell due to the high pressure in the stairwell.

[0011] Therefore, when introducing a smoke control system that uses the stairwell as a windbreak, it is necessary to consider introducing a technology that appropriately controls the wind speed of the blower (10) so that people can evacuate more easily through the stairwell. The problem to be solved

[0012] The present invention aims to support effective smoke control in the event of a fire within a building by presenting a blower control device and a method of operation for controlling a blower in a smoke control system that utilizes a stairwell as a wind tunnel. means of solving the problem

[0013] According to one embodiment of the present invention, a blower installed in a fan room within a building composed of a plurality of floors—the blower is a device that supplies wind to a smoke control damper device installed on a wall between an annex room and a stairwell of each floor by using a stairwell constituting the building as a wind path—and a blower control device for controlling the blower is connected to the blower, wherein when a fire occurs on a first floor, which is one of the plurality of floors constituting the building, and a fire occurrence signal indicating that a fire has occurred on the first floor is received from a fire relay installed on the first floor—the fire relay and the blower control device are connected via a network—the blower control device transmits a driving start signal instructing the blower to drive at a preset reference wind speed, thereby controlling the blower to drive at the preset reference wind speed, and then generates an event for variable control of the wind speed of the blower; and when the event occurs, at preset periodic intervals, the smoke control damper device installed on the wall between an annex room and a stairwell of each of the plurality of floors—the plurality of floors A smoke control damper device installed on the wall between each annex and stairwell is equipped with a differential pressure sensor for measuring the differential pressure between the annex and the room, and the smoke control damper device installed on the wall between each annex and stairwell of each of the plurality of floors and the blower control device are connected by a network. From this, the system includes a control unit that receives the differential pressure between each annex and the room of each of the plurality of floors measured through the differential pressure sensor installed on each smoke control damper device, and then controls the wind speed of the blower so that the differential pressure between each annex and the room of each of the plurality of floors falls within a preset reference range.

[0014] In addition, according to one embodiment of the present invention, a method of operation of a blower control device for controlling a blower installed in a fan room within a building composed of a plurality of floors—the blower is a device that supplies wind to a smoke control damper device installed on the wall between an annex room and a stairwell of each floor by using a stairwell constituting the building as a wind path—is connected to the blower, wherein when a fire occurs on a first floor, which is one of the plurality of floors constituting the building, a fire occurrence signal indicating that a fire has occurred on the first floor is received from a fire relay installed on the first floor—the fire relay and the blower control device are connected by a network—transmits a driving start signal instructing the blower to drive at a preset reference wind speed, thereby controlling the blower to drive at the preset reference wind speed, and then generates an event for variable control of the wind speed of the blower; and when the event occurs, at preset periodic intervals, the smoke control damper device installed on the wall between an annex room and a stairwell of each of the plurality of floors—the plurality A smoke control damper device installed on the wall between the annex and the stairwell of each of the floors is equipped with a differential pressure sensor for measuring the differential pressure between the annex and the room, and the smoke control damper device installed on the wall between the annex and the stairwell of each of the plurality of floors and the blower control device are connected by a network - and after receiving the differential pressure between the annex and the room of each of the plurality of floors measured through the differential pressure sensor installed on each smoke control damper device, the method includes the step of controlling the wind speed of the blower so that the differential pressure between the annex and the room of each of the plurality of floors falls within a preset reference range. Effects of the invention

[0015] The present invention provides a blower control device and a method of operation for controlling a blower in a smoke control system that utilizes a stairwell as a wind tunnel, thereby supporting effective smoke control in the event of a fire within a building. Brief explanation of the drawing

[0016] Figure 1 is a schematic diagram illustrating the installation concept of a conventional smoke control system. FIG. 2 is a schematic diagram illustrating the installation concept of a smoke control system according to an embodiment of the present invention. FIG. 3 is a drawing illustrating the structure of a blower control device according to an embodiment of the present invention. FIG. 4 is a drawing for explaining a blower control device according to an embodiment of the present invention. FIG. 5 is a flowchart illustrating the operation method of a blower control device according to an embodiment of the present invention. Specific details for implementing the invention

[0017] Embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. This description is not intended to limit the present invention to specific embodiments and should be understood to include all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Similar reference numerals have been used for similar components in describing each drawing, and unless otherwise defined, all terms used in this specification, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention pertains.

[0018] In this document, when a part is described as "including" a component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, in various embodiments of the present invention, each component, functional block, or means may be composed of one or more sub-components, and the electrical, electronic, or mechanical functions performed by each component may be implemented by various known devices or mechanical elements, such as electronic circuits, integrated circuits, and ASICs (Application Specific Integrated Circuits), and may be implemented separately or two or more may be integrated into one.

[0019] Meanwhile, the blocks in the attached block diagram or the steps in the flowchart may be interpreted as computer program instructions that perform designated functions by being loaded into the processor or memory of data-processing equipment, such as general-purpose computers, specialized computers, portable notebook computers, and network computers. Since these computer program instructions may be stored in memory provided in a computer device or in memory readable by a computer, the functions described in the blocks in the block diagram or the steps in the flowchart may be produced as manufactured products containing means of instruction to perform them. Furthermore, each block or each step may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). Also, it should be noted that in some alternative embodiments, the functions mentioned in the blocks or steps may be executed in a different order than the prescribed order. For example, two blocks or steps shown in succession may be performed substantially simultaneously or in reverse order, and in some cases, some blocks or steps may be omitted.

[0020] FIG. 2 is a schematic diagram illustrating the installation concept of a smoke control system according to an embodiment of the present invention.

[0021] First, the present invention assumes a situation in which a smoke control system of the type shown in FIG. 2 is established within a building.

[0022] In this regard, in the present invention, a smoke control damper device (102) is installed on the wall between the auxiliary room (302) and the stairwell (301) on each floor constituting the building, and a blower (200) that generates wind for smoke control may be installed in the fan room within the building. The blower (200) may be configured to supply wind to the smoke control damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) on each floor by using the stairwell (301) constituting the building as a wind passage. As a result, unlike the conventional method of supplying wind by using an elevator shaft as a wind passage, in the present invention, the stairwell (301), which has the largest volume among the internal vertical connecting passages of the building, is used as a wind passage to supply wind to the smoke control damper device (102) installed on each floor, so the wind supplied from the blower (200) can reach each floor completely.

[0023] In addition, in the present invention, a fire relay (100) may be provided for each floor within the building, and the fire relay (100) may be connected to an alarm system (101) provided on each floor. The alarm system (101) is a system for detecting a fire within the building and performing an alarm, and may be equipped with various sensors for fire detection, such as a temperature sensor or a smoke sensor, and an output unit for outputting an alarm sound or an alarm message. When a fire is detected on each floor through the sensor, the alarm system (101) installed on each floor may output an alarm sound or an alarm message through the output unit, and may transmit a fire occurrence signal indicating that a fire has occurred on the floor to the fire relay (100) installed on the floor.

[0024] Additionally, the blower (200) may be connected to a blower control device (110) that drives the blower (200) and performs control to increase or decrease the wind speed of the blower (200) when a fire occurs in the building. The blower control device (110) is connected to a network with a fire relay (100) installed on each floor, so that when a fire occurs on a specific floor and a fire occurrence signal is transmitted to the fire relay (100) of that floor, the blower control device (110) receives the fire occurrence signal from the fire relay (100) of that floor and drives the blower (200) so that the wind generated from the blower (200) is supplied through the stairwell (301) to a smoke damper device (102) installed on the wall between the annex room (302) and the stairwell (301) of each floor.

[0025] Additionally, the fire relay (100) installed on each floor may be connected via a network to the smoke damper device (102) installed in the wall between the annex room (302) and the stairwell (301) on each floor, and when a fire occurs on a specific floor and a fire occurrence signal is transmitted to the fire relay (100) on that floor through the alarm system (101) on that floor, the fire relay (100) may transmit a signal indicating that a fire has occurred to the smoke damper device (102) installed on that floor. Also, the fire relay (100) installed on each floor may be connected via a network to the fire relays (100) on other floors, and when a fire occurs on a specific floor and a fire occurrence signal is transmitted to the fire relay (100) on that floor, the fire relay (100) may transmit the fire occurrence signal to the fire relays (100) on other floors. Then, the fire relays (100) on other floors can transmit a signal indicating that a fire has occurred on another floor to the smoke damper device (102) connected to the fire relay (100) on each floor. Then, the smoke damper device (102) installed on each floor is opened to allow the wind supplied from the blower (200) to enter the auxiliary room (302).

[0026] Additionally, the smoke damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) on each floor may be equipped with a differential pressure sensor capable of measuring the differential pressure, which is the pressure difference between the auxiliary room (302) and the indoor room (303). Specifically, the auxiliary room (302) and the indoor room (303) may have pressure measuring ports installed to measure the air pressure between the auxiliary room (302) and the indoor room (303). At this time, the differential pressure sensor installed in the smoke damper device (102) is connected to each pressure measuring port installed in the auxiliary room (302) and the indoor room (303), so that the differential pressure between the auxiliary room (302) and the indoor room (303) can be measured by receiving the pressure value measured by the pressure measuring port of the auxiliary room (302) and the pressure value measured by the pressure measuring port of the indoor room (303), respectively, and then calculating the difference between the two pressure values. Usually, when the pressure in the stairwell (301) increases, the wind passing through the smoke damper device (102) flows into the auxiliary room (302), so the pressure in the auxiliary room (302) also increases, and for this reason, the differential pressure between the auxiliary room (302) and the room (303) increases. Therefore, the fact that the differential pressure between the auxiliary room (302) and the room (303) has increased can be interpreted as a signal that the pressure in the stairwell (301) has also increased.

[0027] Additionally, the smoke damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) of each floor may be connected to the blower control device (110) via a network. As a result, the smoke damper device (102) of each floor can transmit the differential pressure between the auxiliary room (302) and the room (303) of each floor, measured through the differential pressure sensor mounted on the smoke damper device (102), to the blower control device (110).

[0028] In this situation, the blower control device (110) may include an event generating unit (111) and a control unit (112) as shown in the figure in FIG. 3.

[0029] When a fire occurs on the first floor, which is one of the plurality of floors constituting the building, the event generating unit (111) receives a fire occurrence signal indicating that a fire has occurred on the first floor from a fire relay (100) installed on the first floor (the fire relay (100) and the blower control device (110) are connected via a network), and transmits a driving start signal instructing the blower (200) to drive at a preset reference wind speed, thereby controlling the blower (200) to drive at the reference wind speed, and then generates an event to variablely control the wind speed of the blower (200).

[0030] For example, in the embodiment of FIG. 2, if a fire occurs on the '3rd floor', the alarm system (101) installed on the '3rd floor' can transmit a fire occurrence signal indicating that a fire has occurred on the '3rd floor' to the fire relay (100) installed on the '3rd floor', and at this time, the fire relay (100) installed on the '3rd floor' can transmit a fire occurrence signal indicating that a fire has occurred on the '3rd floor' to the blower control device (110) of the present invention.

[0031] Thus, when the fire occurrence signal is received from the fire relay (100) of the ‘3rd floor’ to the blower control device (110) of the present invention, the event generating unit (111) can control the blower (200) to operate at the reference wind speed by transmitting a driving start signal instructing the blower (200) to operate at the preset reference wind speed. Then, the event generating unit (111) can generate an event to variablely control the wind speed of the blower (200).

[0032] When the event occurs through the event generating unit (111) in this way, the control unit (112), at a preset periodic interval, receives the differential pressure between the auxiliary room (302) and the indoor room (303) of each of the plurality of floors, measured through the differential pressure sensor mounted on each smoke damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) of each of the plurality of floors (the smoke damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) of each of the plurality of floors is equipped with a differential pressure sensor that measures the differential pressure between the auxiliary room (302) and the indoor room (303), and the smoke damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) of each of the plurality of floors and the blower control unit (110) are connected by a network), and then each of the plurality of floors The wind speed of the blower (200) is controlled so that the differential pressure between the auxiliary room (302) and the indoor room (303) falls within a preset standard range.

[0033] In this regard, if the above cycle is set to '18 seconds' and the above standard range is set to '40Pa~60Pa', the control unit (112) can control the wind speed of the blower (200) at intervals of '18 seconds' so that the differential pressure between the auxiliary room (302) and the room (303) falls within the above standard range of '40Pa~60Pa'.

[0034] At this time, according to one embodiment of the present invention, the control unit (112) receives the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors at a point in time according to a certain cycle, and if it is confirmed that the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors all fall within the reference range, the control unit (112) can control the blower (200) to be driven in the current cycle at the same wind speed as the wind speed of the blower (200) determined in the previous cycle.

[0035] For example, let's assume that the above cycle is '18 seconds' as in the example above, and that a fire occurred on the '3rd floor'.

[0036] Then, the event generating unit (111) can generate the event to variablely control the wind speed of the blower (200) after transmitting a driving start signal to the blower (200), and at this time, the blower (200) starts driving at a preset reference wind speed according to the driving start signal.

[0037] After that, when ‘18 seconds’ have elapsed, the control unit (112) can receive the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors, measured through the differential pressure sensor mounted on each of the smoke damper devices (102), from the smoke damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) of each of the plurality of floors, and can check whether the received differential pressure falls within the reference range.

[0038] If, as a result of such verification, it is confirmed that the differential pressure between each of the auxiliary rooms (302) and the room (303) of the plurality of layers falls within the reference range, the control unit (112) can control the blower (200) to operate in the current cycle at the same wind speed as the reference wind speed, which is the wind speed of the blower (200) determined in the previous cycle.

[0039] Then, the blower (200) is driven at the above reference wind speed, which is the same wind speed as the previous cycle, even in the current cycle.

[0040] After that, when '18 seconds' have passed again, the control unit (112) can receive the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors, measured through the differential pressure sensor mounted on each smoke damper device (102), from the smoke damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) of each of the plurality of floors, and can check again whether the received differential pressure falls within the reference range.

[0041] If, as a result of such verification, it is confirmed that the differential pressure between each of the auxiliary rooms (302) and the room (303) of the plurality of layers falls within the reference range, the control unit (112) can control the blower (200) to operate in the current cycle at the same wind speed as the reference wind speed, which is the wind speed of the blower (200) determined in the previous cycle.

[0042] Then, the blower (200) is driven at the above reference wind speed, which is the same wind speed as the previous cycle, even in the current cycle.

[0043] In this way, if the control unit (112) confirms that the differential pressure of each of the plurality of layers in a specific cycle falls within the reference range, it can be considered that the smoke removal process is proceeding normally, so the wind speed of the blower (200) in that cycle can be controlled to be maintained at the same level as that of the previous cycle.

[0044] In addition, according to one embodiment of the present invention, if the control unit (112) receives the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors at a point in time according to a certain cycle, and if it is confirmed that the differential pressure between the auxiliary room (302) and the room (303) of one or more of the plurality of floors is outside the reference range, then among the target floors confirmed to have a differential pressure outside the reference range, the number of first-type target floors having a differential pressure higher than the upper limit value of the reference range and the number of second-type target floors having a differential pressure within a preset threshold range (the threshold range is a range set to have an upper limit value having a size less than or equal to the lower limit value of the reference range) are confirmed, and if the number of first-type target floors is confirmed to be greater than or equal to the number of second-type target floors, the control unit (112) refers to a preset wind speed reduction ratio table (the wind speed reduction ratio table has a wind speed reduction ratio designated to be applied according to the number of floors having a differential pressure higher than the upper limit value of the reference range recorded therein) and [determines] the number of first-type target floors corresponding to After confirming the wind speed reduction ratio, the blower (200) can be controlled to operate in the current cycle at a wind speed reduced by the confirmed wind speed reduction ratio compared to the wind speed of the blower (200) determined in the previous cycle.

[0045] In this regard, the above wind speed reduction ratio table may be configured as shown in Table 1 below.

[0047] Number of floors Wind speed reduction rate 1 10% 2 20% 3 30% ... ...

[0049] Let us assume that, as in the example above, the reference range is '40 Pa to 60 Pa', and at a point in time according to a certain cycle, the control unit (112) receives the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors, and as a result, it is confirmed that the differential pressure between the auxiliary room (302) and the room (303) of the '2nd floor, 3rd floor, and 4th floor' among the plurality of floors is outside the reference range.

[0050] Then, the control unit (112) can determine the number of first-type target layers having a differential pressure higher than the upper limit value of the reference range, '60 Pa', among the '2nd layer, 3rd layer, and 4th layer', and the number of second-type target layers having a differential pressure within a preset threshold range.

[0051] Here, the threshold range is a range set such that the upper limit value is less than or equal to the lower limit value of the reference range, which is '40 Pa'. In this embodiment, if the threshold range is assumed to be '10 Pa to 40 Pa', the control unit (112) can determine the number of the second type target layers that have a differential pressure within the threshold range of '10 Pa to 40 Pa' among the '2nd layer, 3rd layer, and 4th layer'.

[0052] At this time, among ‘2nd floor, 3rd floor, 4th floor’, ‘2nd floor, 3rd floor’ is said to be a first-type target layer having a differential pressure higher than ‘60 Pa’, and ‘4th floor’ is said to be a second-type target layer having a differential pressure within ‘10 Pa to 40 Pa’, the control unit (112) can confirm the number of first-type target layers as ‘2’ and the number of second-type target layers as ‘1’.

[0053] After that, the control unit (112) can refer to a wind speed reduction ratio table such as Table 1, since the number of the first type target layer is greater than or equal to the number of the second type target layer, and confirm the wind speed reduction ratio corresponding to the number of the first type target layer, '2', as '20%', and then control the blower (200) to be driven in the current cycle at a wind speed reduced by the confirmed wind speed reduction ratio of '20%' compared to the wind speed of the blower (200) determined in the previous cycle.

[0054] In this regard, if the wind speed of the blower (200) in the previous cycle was the above-mentioned standard wind speed, the control unit (112) can control the blower (200) to be driven in the current cycle at a wind speed reduced by '20%' compared to the above-mentioned standard wind speed.

[0055] As a result, less wind is supplied to each of the aforementioned multiple layers during the cycle, thereby enabling the effect of reducing the differential pressure between the '2nd and 3rd layers'.

[0056] At this time, according to one embodiment of the present invention, when the control unit (112) performs control to reduce the wind speed of the blower (200) in a specific cycle according to a predetermined wind speed reduction ratio, if it is confirmed that the wind speed of the blower (200) that should be reduced by the wind speed reduction ratio confirmed in the cycle compared to the wind speed of the blower (200) in the previous cycle is calculated to be lower than the minimum wind speed that has been pre-set for the normal operation of the smoke control system, the control unit may perform blower (200) control so that the blower (200) is driven at the minimum wind speed, rather than driving the blower (200) at the wind speed reduced by the wind speed reduction ratio.

[0057] In addition, according to one embodiment of the present invention, the control unit (112), at a point in time according to a certain cycle, receives the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of layers, and if it is confirmed that the differential pressure between the auxiliary room (302) and the room (303) of one or more of the plurality of layers is outside the reference range, then among the target layers confirmed to have a differential pressure outside the reference range, the number of first-type target layers having a differential pressure higher than the upper limit value of the reference range and the number of second-type target layers having a differential pressure within the threshold range are checked, and if it is confirmed that the number of second-type target layers exceeds the number of first-type target layers, the control unit refers to a preset wind speed increase ratio table (the wind speed increase ratio table has a wind speed increase ratio designated to be applied according to the number of layers having a differential pressure within the threshold range) to check the wind speed increase ratio corresponding to the number of second-type target layers, and then the blower (200) determined in the previous cycle The blower (200) can be controlled to operate in the corresponding cycle at a wind speed increased by the wind speed increase ratio confirmed above in relation to the wind speed.

[0058] In this regard, the above wind speed increase ratio table may be configured as shown in Table 2 below.

[0060] Number of floors Wind speed increase rate 1 10% 2 20% 3 30% ... ...

[0062] Let us assume that, as in the example above, the reference range is '40Pa~60Pa', and at a point in time according to a certain cycle, the control unit (112) receives the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors, and as a result, it is confirmed that the differential pressure between the auxiliary room (302) and the room (303) of the '2nd floor, 4th floor, and 5th floor' among the plurality of floors is outside the reference range.

[0063] Then, the control unit (112) can determine the number of first-type target layers having a differential pressure higher than the upper limit value of the reference range, '60 Pa', among the '2nd layer, 4th layer, and 5th layer', and the number of second-type target layers having a differential pressure within a preset threshold range.

[0064] At this time, as in the example above, if the threshold range is assumed to be '10Pa~40Pa', the control unit (112) can determine the number of the second type target layers having a differential pressure within the threshold range of '10Pa~40Pa' among the '2nd layer, 4th layer, 5th layer'.

[0065] At this time, among ‘2nd floor, 4th floor, 5th floor’, ‘2nd floor’ is said to be the first type target layer having a differential pressure higher than ‘60 Pa’, and ‘4th floor, 5th floor’ is said to be the second type target layer having a differential pressure within ‘10 Pa to 40 Pa’, the control unit (112) can confirm the number of the first type target layer as ‘1’ and the number of the second type target layers as ‘2’.

[0066] After that, the control unit (112) can refer to a wind speed increase ratio table such as Table 2 because the number of the second type target layer exceeds the number of the first type target layer, and confirm the wind speed increase ratio corresponding to the number of the second type target layer, '2', as '20%', and then control the blower (200) to be driven in the current cycle at a wind speed increased by the confirmed wind speed increase ratio of '20%' compared to the wind speed of the blower (200) determined in the previous cycle.

[0067] As a result, more wind is supplied to each of the aforementioned multiple layers during the cycle, thereby enabling the effect of increasing the differential pressure of the '4th and 5th layers'.

[0068] At this time, according to one embodiment of the present invention, when the control unit (112) performs control to increase the wind speed of the blower (200) according to a predetermined wind speed increase ratio in a specific cycle, if it is confirmed that the wind speed of the blower (200) that should be increased by the wind speed increase ratio confirmed in the cycle compared to the wind speed of the blower (200) in the previous cycle is calculated to be higher than the maximum wind speed that has been pre-set for the normal operation of the smoke control system, the control unit may perform blower (200) control so that the blower (200) is driven at the maximum wind speed, rather than driving the blower (200) at the wind speed increased by the wind speed increase ratio.

[0069] In addition, according to one embodiment of the present invention, the control unit (112) receives the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of layers at a point in time according to a certain cycle, and if there is at least one layer among the plurality of layers where the differential pressure between the auxiliary room (302) and the room (303) is lower than the lower limit value of the threshold range, the control unit (112) can reduce the wind speed of the blower (200) to a preset minimum wind speed and then control the operation of the blower (200) so that the wind speed changes according to a preset wind speed change waveform during the cycle.

[0070] Here, the wind speed change waveform may be a pulse waveform having a partial waveform that is repeated n times (n is a natural number greater than or equal to 2) times, consisting of a first section in which the wind speed of the blower (200) increases from the lowest wind speed to a preset maximum wind speed, a second section in which the wind speed of the blower (200) is maintained at the maximum wind speed, and a third section in which the wind speed of the blower (200) decreases from the maximum wind speed to the lowest wind speed, within a time period according to one cycle.

[0071] In this regard, if the above period is denoted as 'T', n as '3', the preset maximum wind speed as 'V1', and the preset minimum wind speed as 'V2', the wind speed change waveform may be a pulsating waveform having a partial waveform (410) that is repeated three times within a time period of one period called 'T' as shown in FIG. 4, consisting of a first section (S1) in which the wind speed of the blower (200) increases from the minimum wind speed 'V2' to the maximum wind speed 'V1', a second section (S2) in which the wind speed of the blower (200) is maintained at the maximum wind speed 'V1', and a third section (S3) in which the wind speed of the blower (200) decreases from the maximum wind speed 'V1' to the minimum wind speed 'V2'.

[0072] At this time, if the above period is defined as '18 seconds' as in the example above, the partial waveform (410) composed of the first section (S1), the second section (S2), and the third section (S3) is a waveform formed in a '6 second' section, and at this time, the first section (S1) can be composed of '1 second', the second section (S2) of '1 second', and the third section (S3) of '4 seconds'.

[0073] Let us assume that, as in the example above, the threshold range is '10Pa to 40Pa', and at a point in time according to a certain cycle, the control unit (112) receives the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors, and as a result, it is confirmed that the differential pressure between the auxiliary room (302) and the room (303) of the '4th floor' among the plurality of floors is lower than the lower limit value of the threshold range, which is '10Pa'.

[0074] The reason the pressure difference between the auxiliary room (302) and the indoor room (303) on a specific floor suddenly decreases is due to the opening of the door connecting the auxiliary room (302) and the indoor room (303) as a person in the indoor room (303) comes out to the auxiliary room (302) to evacuate. When the door connecting the auxiliary room (302) and the indoor room (303) is opened, the wind present in the auxiliary room (302) flows into the indoor room (303), and the pressure in the auxiliary room (302) is instantaneously lowered to the same level as the pressure in the indoor room (303). In other words, the pressure difference between the auxiliary room (302) and the indoor room (303) decreases. When the pressure difference between the auxiliary room (302) and the indoor room (303) decreases in this way, conversely, the pressure difference between the stairwell (301) and the auxiliary room (302) increases excessively. In this case, it may become difficult for a person who has come out to the auxiliary room (302) to evacuate to open the door connecting the auxiliary room (302) and the stairwell (301), and thus the person who has come out to the auxiliary room (302) may face a problem where they cannot evacuate from the auxiliary room (302) to the stairwell (301).

[0075] As a result, as in the example described above, if it is confirmed that the differential pressure between the auxiliary room (302) and the room (303) of the ‘4th floor’ among the plurality of floors is lower than the lower limit value of the critical range, which is ‘10 Pa’, the control unit (112) can ignore all the control methods described so far and perform wind speed control of the blower (200) to lower the pressure of the stairwell (301) of the ‘4th floor’. However, if the control unit (112) only lowers the wind speed of the blower (200) unconditionally, the pressure of the stairwells (301) of the remaining floors excluding the ‘4th floor’ will also drop, making it difficult to achieve an appropriate smoke control effect, the control unit (112) can perform an operation to control the wind speed of the blower (200) according to the wind speed change waveform having the pulsating waveform of the figure shown in FIG. 4.

[0076] In this regard, as in the example described above, if it is confirmed that the differential pressure between the auxiliary room (302) and the room (303) of the ‘4th floor’ among the plurality of floors is lower than the lower limit value of the critical range, ‘10 Pa’, the control unit (112) can immediately reduce the wind speed of the blower (200) to the lowest wind speed, ‘V2’.

[0077] Then, the control unit (112) can control the operation of the blower (200) so that the wind speed of the blower (200) changes according to the wind speed change waveform of the figure shown in Fig. 4 during the corresponding cycle of ‘18 seconds’.

[0078] Specifically, the control unit (112) can control the wind speed of the blower (200) to increase from the lowest wind speed 'V2' to the highest wind speed 'V1' according to the corresponding partial waveform (410) during the first first section (S1), control the wind speed of the blower (200) to be maintained at the highest wind speed 'V1' during the first second section (S2), and control the wind speed of the blower (200) to decrease from the highest wind speed 'V1' to the lowest wind speed 'V2' according to the corresponding partial waveform (410) during the first third section (S3).

[0079] And the control unit (112) can control the wind speed of the blower (200) to increase from the lowest wind speed 'V2' to the highest wind speed 'V1' according to the corresponding partial waveform (410) during the second first section (S1), control the wind speed of the blower (200) to be maintained at the highest wind speed 'V1' during the second second section (S2), and control the wind speed of the blower (200) to decrease from the highest wind speed 'V1' to the lowest wind speed 'V2' according to the corresponding partial waveform (410) during the second third section (S3).

[0080] Finally, the control unit (112) can control the wind speed of the blower (200) to increase from the lowest wind speed 'V2' to the highest wind speed 'V1' according to the corresponding partial waveform (410) during the third first section (S1), control the wind speed of the blower (200) to be maintained at the highest wind speed 'V1' during the third second section (S2), and control the wind speed of the blower (200) to decrease from the highest wind speed 'V1' to the lowest wind speed 'V2' according to the corresponding partial waveform (410) during the third third section (S3).

[0081] If, after the blower (200) drive control according to the wind speed change waveform is completed in the current cycle through the control unit (112), it is confirmed in the next cycle that there is no layer among the plurality of layers where the differential pressure between the auxiliary room (302) and the indoor room (303) is less than the lower limit value of the threshold range, the control unit (112) may perform a normal control process rather than performing blower (200) control according to the wind speed change waveform, and conversely, if it is confirmed in the next cycle that there is at least one layer among the plurality of layers where the differential pressure between the auxiliary room (302) and the indoor room (303) is less than the lower limit value of the threshold range, the control unit (112) may continue to perform blower (200) control according to the wind speed change waveform.

[0082] As described so far, the control unit (112) can repeatedly perform the operation of controlling the wind speed of the blower (200) based on the received differential pressure, after receiving the differential pressure between the auxiliary room (302) and the room (303) of each of the plurality of floors, measured through the differential pressure sensor mounted on each smoke damper device (102), from the smoke damper device (102) installed on the wall between the auxiliary room (302) and the stairwell (301) of each of the plurality of floors at the periodic interval.

[0083] FIG. 5 is a flowchart illustrating the operation method of a blower control device for controlling a blower, which is connected to a blower installed in a fan room within a building composed of multiple floors according to an embodiment of the present invention (the blower is a device that supplies wind to a smoke damper device installed on the wall between the annex room and the stairwell of each floor by using the stairwell constituting the building as a wind tunnel).

[0084] In step (S510), when a fire occurs on the first floor, which is one of the plurality of floors constituting the building, and a fire occurrence signal indicating that a fire has occurred on the first floor is received from a fire relay installed on the first floor (the fire relay and the blower control device are connected via a network), a driving start signal instructing the blower to drive at a preset reference wind speed is transmitted, thereby controlling the blower to drive at the reference wind speed, and then an event is generated to variablely control the wind speed of the blower.

[0085] In step (S520), when the above event occurs, at preset intervals, the differential pressure between the auxiliary room and the room of each of the plurality of floors is measured through the differential pressure sensor installed in each smoke damper device installed on the wall between the auxiliary room and the stairwell of each of the plurality of floors (the smoke damper device installed on the wall between the auxiliary room and the stairwell of each of the plurality of floors is equipped with a differential pressure sensor that measures the differential pressure between the auxiliary room and the room, and the smoke damper device installed on the wall between the auxiliary room and the stairwell of each of the plurality of floors and the blower control device are connected by a network), and then the wind speed of the blower is controlled so that the differential pressure between the auxiliary room and the room of each of the plurality of floors falls within a preset standard range.

[0086] At this time, according to one embodiment of the present invention, in step (S520), at a point in time according to a certain cycle, if the differential pressure between the auxiliary room and the room of each of the plurality of floors is received and it is confirmed that the differential pressure between the auxiliary room and the room of each of the plurality of floors all fall within the reference range, the blower can be controlled to operate in that cycle at the same wind speed as the wind speed of the blower determined in the previous cycle.

[0087] In addition, according to one embodiment of the present invention, in step (S520), at a point in time according to a certain cycle, if the differential pressure between the auxiliary room and the room of each of the plurality of floors is received and it is confirmed that the differential pressure between the auxiliary room and the room of one or more of the plurality of floors is outside the reference range, among the target floors confirmed to have a differential pressure outside the reference range, the number of first-class target floors having a differential pressure higher than the upper limit value of the reference range and the number of second-class target floors having a differential pressure within a preset threshold range (the threshold range is a range set to have an upper limit value having a size less than or equal to the lower limit value of the reference range) are checked, and if the number of first-class target floors is confirmed to be greater than or equal to the number of second-class target floors, a preset wind speed reduction ratio table (the wind speed reduction ratio table records a wind speed reduction ratio designated to be applied according to the number of floors having a differential pressure higher than the upper limit value of the reference range) is referenced to check the wind speed reduction ratio corresponding to the number of first-class target floors, and then compared with the wind speed of the blower determined in the previous cycle The blower can be controlled to operate in the corresponding cycle at a wind speed reduced by the wind speed reduction ratio confirmed above.

[0088] In addition, according to one embodiment of the present invention, in step (S520), at a point in time according to a certain cycle, if the differential pressure between the auxiliary room and the room of each of the plurality of floors is received and it is confirmed that the differential pressure between the auxiliary room and the room of one or more of the plurality of floors deviates from the reference range, then among the target floors confirmed to have a differential pressure deviate from the reference range, the number of first-type target floors having a differential pressure higher than the upper limit of the reference range and the number of second-type target floors having a differential pressure within the critical range are confirmed, and if it is confirmed that the number of second-type target floors exceeds the number of first-type target floors, a pre-set wind speed increase ratio table (the wind speed increase ratio table records a wind speed increase ratio designated to be applied according to the number of floors having a differential pressure within the critical range) is referenced to confirm the wind speed increase ratio corresponding to the number of second-type target floors, and then the blower in the corresponding cycle is operated at a wind speed increased by the confirmed wind speed increase ratio compared to the wind speed of the blower determined in the previous cycle. It can be controlled to operate.

[0089] At this time, according to one embodiment of the present invention, in step (S520), if at a point in time according to one cycle, the differential pressure between the auxiliary room and the room of each of the plurality of layers is received and there is at least one layer among the plurality of layers where the differential pressure between the auxiliary room and the room is confirmed to be lower than the lower limit value of the threshold range, the wind speed of the blower is reduced to a preset minimum wind speed, and then during the cycle, the operation of the blower can be controlled so that the wind speed changes according to a preset wind speed change waveform (the wind speed change waveform is a pulsating waveform having a form in which a partial waveform consisting of a first section in which the wind speed of the blower increases from the minimum wind speed to a preset maximum wind speed, a second section in which the wind speed of the blower is maintained at the maximum wind speed, and a third section in which the wind speed of the blower decreases from the maximum wind speed to the minimum wind speed is repeated n times (n is a natural number greater than or equal to 2) times within the time according to one cycle).

[0090] Hereinafter, the operation method of a blower control device according to an embodiment of the present invention has been described with reference to FIG. 5. Since the operation method of the blower control device according to an embodiment of the present invention corresponds to the configuration of the operation of the blower control device (110) described using FIG. 2 to FIG. 4, a more detailed description thereof will be omitted.

[0091] The operation method of a blower control device according to one embodiment of the present invention can be implemented as a computer program stored in a storage medium for execution through combination with a computer.

[0092] In addition, the method of operation of a blower control device according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., either individually or in combination. The program instructions recorded on the medium may be those specifically designed and configured for the present invention, or they may be those known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; and hardware devices specifically configured to store and execute program instructions, such as ROMs and flash memory. Examples of program instructions include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc.

[0093] As described above, the present invention has been explained by specific details such as specific components, limited embodiments, and drawings; however, this is provided merely to aid in a more comprehensive understanding of the invention, and the invention is not limited to the above embodiments. A person skilled in the art can make various modifications and variations from this description.

[0094] Accordingly, the scope of the present invention is not limited to the described embodiments, and all things equivalent to or having equivalent variations to the claims set forth below, as well as the claims set forth below, shall be considered to fall within the scope of the concept of the present invention. Explanation of the symbols

[0095] 110: Blower control unit 111: Event originator 112: Control unit 100: Firefighting relay 102: Smoke control damper device 200: Blower

Claims

Claim 1 A blower control device for controlling a blower, which is connected to a blower installed in a fan room within a building composed of multiple floors—the blower is a device that supplies wind to a smoke control damper device installed on a wall between an annex room and a stairwell of each floor by using a stairwell constituting the building as a wind path—the blower control device for controlling the blower by transmitting a driving start signal instructing the blower to drive at a preset reference wind speed, thereby controlling the blower to drive at the reference wind speed, and then generating an event for variable control of the wind speed of the blower; A blower control device comprising, when the above event occurs, a control unit that receives the differential pressure between the auxiliary room and the room of each of the plurality of floors measured through the differential pressure sensor mounted on each smoke control damper device at a preset periodic interval, and controls the wind speed of the blower so that the differential pressure between the auxiliary room and the room of each of the plurality of floors falls within a preset reference range, from a smoke control damper device installed on the wall between the auxiliary room and the stairwell of each of the plurality of floors—the smoke control damper device installed on the wall between the auxiliary room and the stairwell of each of the plurality of floors is equipped with a differential pressure sensor for measuring the differential pressure between the auxiliary room and the room of each of the plurality of floors, and the smoke control damper device installed on the wall between the auxiliary room and the stairwell of each of the plurality of floors is connected to the blower control device via a network. Claim 2 A blower control device according to claim 1, wherein the control unit receives the differential pressure between the auxiliary room and the room of each of the plurality of floors at a point in time according to a certain cycle, and if it is confirmed that the differential pressure between the auxiliary room and the room of each of the plurality of floors all falls within the reference range, the control unit controls the blower to be driven in the current cycle at the same wind speed as the blower determined in the previous cycle. Claim 3 In claim 1, the control unit, at a point in time according to a certain cycle, receives the differential pressure between the auxiliary room and the room of each of the plurality of floors, and if it is confirmed that the differential pressure between the auxiliary room and the room of one or more of the plurality of floors deviates from the reference range, among the target floors confirmed to have a differential pressure deviate from the reference range, checks the number of Type 1 target floors having a differential pressure higher than the upper limit of the reference range and the number of Type 2 target floors having a differential pressure within a preset threshold range—the threshold range is a range set to have an upper limit value that is less than or equal to the lower limit of the reference range—and if the number of Type 1 target floors is confirmed to be greater than or equal to the number of Type 2 target floors, it refers to a preset wind speed reduction ratio table—the wind speed reduction ratio table records a wind speed reduction ratio designated to be applied according to the number of floors having a differential pressure higher than the upper limit of the reference range—to check the wind speed reduction ratio corresponding to the number of Type 1 target floors, and then compares the confirmed wind speed reduction with the wind speed of the blower determined in the previous cycle. A blower control device characterized by controlling the blower to operate in the corresponding cycle at a wind speed reduced by a ratio. Claim 4 In paragraph 3, the control unit, at a point in time according to a certain cycle, receives the differential pressure between the auxiliary room and the room of each of the plurality of floors and, if it is confirmed that the differential pressure between the auxiliary room and the room of one or more of the plurality of floors deviates from the reference range, checks the number of Type 1 target floors having a differential pressure higher than the upper limit of the reference range and the number of Type 2 target floors having a differential pressure within the critical range among the target floors confirmed to have a differential pressure deviates from the reference range; if it is confirmed that the number of Type 2 target floors exceeds the number of Type 1 target floors, it refers to a preset wind speed increase ratio table—in which a wind speed increase ratio designated to be applied according to the number of floors having a differential pressure within the critical range is recorded—to check the wind speed increase ratio corresponding to the number of Type 2 target floors, and then controls the blower to be driven in the corresponding cycle at a wind speed increased by the confirmed wind speed increase ratio compared to the wind speed of the blower determined in the previous cycle. Blower control device. Claim 5 A blower control device according to claim 4, wherein the control unit receives the differential pressure between the auxiliary room and the room of each of the plurality of floors at a point in time according to a certain cycle, and if there is at least one floor among the plurality of floors where the differential pressure between the auxiliary room and the room is confirmed to be lower than the lower limit value of the critical range, the control unit reduces the wind speed of the blower to a preset minimum wind speed and, during the cycle, controls the operation of the blower so that the wind speed changes according to a preset wind speed change waveform—the wind speed change waveform is a pulse waveform having a form in which a partial waveform consisting of a first section in which the wind speed of the blower increases from the minimum wind speed to a preset maximum wind speed, a second section in which the wind speed of the blower is maintained at the maximum wind speed, and a third section in which the wind speed of the blower decreases from the maximum wind speed to the minimum wind speed is repeated n times (n is a natural number greater than or equal to 2). Claim 6 A method of operation of a blower control device for controlling a blower, which is connected to a blower installed in a fan room within a building composed of multiple floors—the blower is a device that supplies wind to a smoke control damper device installed on the wall between an annex room and a stairwell of each floor by using a stairwell constituting the building as a wind path—in the event that a fire occurs on a first floor, which is one of the multiple floors constituting the building, and a fire occurrence signal indicating that a fire has occurred on the first floor is received from a fire relay installed on the first floor—the fire relay and the blower control device are connected via a network—by transmitting a driving start signal instructing the blower to drive at a preset reference wind speed, thereby controlling the blower to drive at the reference wind speed, and then generating an event for variable control of the wind speed of the blower; A method of operation of a blower control device comprising the step of, when the above event occurs, receiving the differential pressure between the auxiliary room and the room of each of the plurality of floors measured through the differential pressure sensor mounted on each of the smoke control damper device at a preset periodic interval—wherein the smoke control damper device installed on the wall between the auxiliary room and the stairwell of each of the plurality of floors is equipped with a differential pressure sensor for measuring the differential pressure between the auxiliary room and the room, and the smoke control damper device installed on the wall between the auxiliary room and the stairwell of each of the plurality of floors and the blower control device are connected by a network—and controlling the wind speed of the blower so that the differential pressure between the auxiliary room and the room of each of the plurality of floors falls within a preset reference range. Claim 7 A method of operation of a blower control device according to claim 6, wherein the controlling step is characterized by, at a point in time according to a certain cycle, receiving the differential pressure between the auxiliary room and the room of each of the plurality of floors, and if it is confirmed that the differential pressure between the auxiliary room and the room of each of the plurality of floors all falls within the reference range, controlling the blower to be driven in the current cycle at the same wind speed as the blower determined in the previous cycle. Claim 8 In claim 6, the controlling step, at a point in time according to a certain cycle, receives the differential pressure between the annex room and the room of each of the plurality of floors, and if it is confirmed that the differential pressure between the annex room and the room of one or more of the plurality of floors deviates from the reference range, checks the number of Type 1 target floors having a differential pressure higher than the upper limit of the reference range and the number of Type 2 target floors having a differential pressure within a preset threshold range—wherein the threshold range is a range set to have an upper limit value that is less than or equal to the lower limit of the reference range—among the target floors confirmed to have a differential pressure deviating from the reference range, and if it is confirmed that the number of Type 1 target floors is greater than or equal to the number of Type 2 target floors, refers to a preset wind speed reduction ratio table—wherein the wind speed reduction ratio table records a wind speed reduction ratio designated to be applied according to the number of floors having a differential pressure higher than the upper limit of the reference range—to check the wind speed reduction ratio corresponding to the number of Type 1 target floors, and then compares the confirmed wind speed reduction with the wind speed of the blower determined in the previous cycle. A method of operation of a blower control device characterized by controlling the blower to operate in the corresponding cycle at a wind speed reduced by a ratio. Claim 9 In claim 8, the controlling step is characterized by, at a point in time according to a certain cycle, receiving the differential pressure between the auxiliary room and the room of each of the plurality of floors, and if it is confirmed that the differential pressure between the auxiliary room and the room of one or more of the plurality of floors deviates from the reference range, checking the number of Type 1 target floors having a differential pressure higher than the upper limit of the reference range and the number of Type 2 target floors having a differential pressure within the critical range among the target floors confirmed to have a differential pressure deviates from the reference range, and if it is confirmed that the number of Type 2 target floors exceeds the number of Type 1 target floors, referring to a preset wind speed increase ratio table—in which a wind speed increase ratio designated to be applied according to the number of floors having a differential pressure within the critical range is recorded—checking the wind speed increase ratio corresponding to the number of Type 2 target floors, and then controlling the blower to be driven in the said cycle at a wind speed increased by the checked wind speed increase ratio compared to the wind speed of the blower determined in the previous cycle. Operation method of a blower control device. Claim 10 A method of operation of a blower control device according to claim 9, wherein the controlling step, at a point in time according to a certain cycle, receives the differential pressure between the auxiliary room and the room of each of the plurality of layers, and if there is at least one layer among the plurality of layers where the differential pressure between the auxiliary room and the room is confirmed to be lower than the lower limit value of the critical range, the wind speed of the blower is reduced to a preset minimum wind speed, and then, during the cycle, controls the driving of the blower so that the wind speed changes according to a preset wind speed change waveform—the wind speed change waveform is a pulse waveform having a form in which a partial waveform consisting of a first section in which the wind speed of the blower increases from the minimum wind speed to the preset maximum wind speed, a second section in which the wind speed of the blower is maintained at the maximum wind speed, and a third section in which the wind speed of the blower decreases from the maximum wind speed to the minimum wind speed is repeated n times (n is a natural number greater than or equal to 2). Claim 11 A computer-readable recording medium having a computer program for executing the method of any one of paragraphs 6 through 10 in combination with a computer. Claim 12 A computer program stored on a storage medium for executing the method of any one of paragraphs 6 through 10 through combination with a computer.

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