Ventilation system

Abstract

To increase the supply of outside air to an adjacent space in which the number of people in a room is increased more than that at a normal time by being used as an evacuation room at the occurrence of a disaster more than that at the normal time while employing a rational and simple constitution.SOLUTION: A ventilation system comprises: operation control means 71 for performing an operation at a prescribed set ventilation mode; and ventilation mode switching means 72 capable of switching the set ventilation mode to a normal-time ventilation mode and a disaster-time ventilation mode. The normal-time ventilation mode is a ventilation mode for exhausting inner air RA from a living room R2 by living room exhaust means, and the disaster-time ventilation mode is a ventilation mode for reducing an exhaust wind volume of the inner air RA from the living rooms R1, R3 by the living room exhaust means more than that at the normal-time ventilation mode, and increasing a moving wind volume of the inner air RA to the adjacent space H from the lining rooms R1, R3 through a path duct 60 more than that at the normal-time ventilation mode by increasing the exhaust wind volume of the inner air RA from the adjacent space H by adjacent space exhaust means HE more than that at the normal-time ventilation mode.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a ventilation system that is installed in a building having a room and an adjacent space adjacent to the room that can be used as an evacuation room, and that is equipped with a room air supply means that can supply outside air to the room from the outside. [Background technology]

[0002] In relatively large buildings, even in the event of a disaster such as a major earthquake, equipment systems are sometimes planned with the assumption of a so-called BCP response, in which adjacent spaces such as entrances and corridors adjacent to living rooms can be used as evacuation rooms for evacuees, while business or residence can be continued in the rooms (see, for example, Patent Document 1). When planning a ventilation system equipped with a room air supply means, such as a room air supply fan that can supply outside air from outside to rooms, as an equipment system that takes such BCP measures, it is necessary to increase the amount of outside air supplied to the adjacent space more than usual, since in the event of a disaster the number of occupants in the adjacent space used as an evacuation room will be greater than normal. As a configuration for increasing the supply of outside air to the adjacent space in the event of a disaster, it is possible to provide an adjacent space supply fan that can directly supply outside air from outside to the adjacent space, separate from the above-mentioned room air supply means, and to have this adjacent space supply fan cover all of the increase in the supply of outside air to the adjacent space in the event of a disaster. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-009581 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, this configuration requires the installation of a relatively large and expensive air supply fan for the adjacent space, and since this air supply fan for the adjacent space is only operated in the event of a disaster, it cannot be said to be a rational configuration. In view of this situation, the main objective of the present invention is to provide a technology in a ventilation system that is installed in a building having a living room and an adjacent space that is adjacent to the living room and can be used as an evacuation room, and that is equipped with a room air supply means that can supply outside air to the living room from outside, which employs a rational and simple configuration and increases the supply of outside air to an adjacent space that will be used as an evacuation room in the event of a disaster, thereby increasing the number of occupants compared to normal times. [Means for solving the problem]

[0005] A first characteristic configuration of the present invention is a ventilation system installed in a building having a room and an adjacent space adjacent to the room that can be used as an evacuation room, the ventilation system including a room air supply means capable of supplying outside air to the room from the outside, A path duct connecting the living room and the adjacent space; A room exhaust means capable of exhausting indoor air from the room to the outside; adjacent space exhaust means capable of exhausting internal air from the adjacent space to the outside; an operation control means for controlling the living room exhaust means and the adjacent space exhaust means to operate in a predetermined set ventilation mode while supplying outside air to the living room by the living room air supply means; A ventilation mode switching means for switching the set ventilation mode between a normal ventilation mode and a disaster ventilation mode, the normal ventilation mode is a ventilation mode in which inside air is exhausted from the living room by the living room exhaust means, The disaster ventilation mode is a ventilation mode in which the volume of inside air exhausted from the living room by the living room exhaust means is reduced compared to the normal ventilation mode, and the volume of inside air exhausted from the adjacent space by the adjacent space exhaust means is increased compared to the normal ventilation mode, thereby increasing the volume of inside air moving from the living room to the adjacent space through the path duct compared to the normal ventilation mode.

[0006] According to this configuration, during normal times when the adjacent space is not used as an evacuation room, the set ventilation mode in which the operation control means operates can be set to the normal ventilation mode by the ventilation mode switching means. When the operation is performed in the normal ventilation mode, outside air is supplied to the living room by the living room air supply means, while inside air is exhausted from the living room by the living room exhaust means. This makes it possible to reliably and sufficiently ventilate at least the living room during normal times by directly supplying outside air and directly exhausting inside air. On the other hand, in the event of a disaster in which the adjacent space is used as an evacuation room, the set ventilation mode in which the operation control means operates can be set to the disaster ventilation mode by the ventilation mode switching means. When the operation is performed in the disaster ventilation mode, the amount of exhaust air from the living room by the living room exhaust means is reduced compared to the normal ventilation mode, and the amount of exhaust air from the adjacent space by the adjacent space exhaust means is increased compared to the normal ventilation mode. Then, the amount of air moving from the living room to the adjacent space through the path duct increases compared to the normal ventilation mode, and the outside air supplied to the living room is easily moved to the adjacent space through the path duct. In this way, in the event of a disaster, the living room in which business or residence continues can be reliably and sufficiently ventilated by direct supply of outside air, while the adjacent space in which the number of occupants increases more than normal due to being used as an evacuation room can be rationally ventilated by using the outside air moving from the living room to the adjacent space through the path duct. Therefore, the adjacent space supply means for directly supplying outside air to the adjacent space from the outside can be omitted or simplified. Therefore, the present invention provides a ventilation system that is installed in a building having a room and an adjacent space that is adjacent to the room and can be used as an evacuation room, and is equipped with a room air supply means that can supply outside air to the room from outside, and that adopts a rational and simple configuration, while providing technology that increases the supply of outside air to adjacent spaces that will be used as evacuation rooms in the event of a disaster and therefore will have a higher number of occupants than normal.

[0007] A second characteristic configuration of the present invention is an adjacent space exhaust fan that is provided in an adjacent space exhaust path that connects an adjacent space exhaust port that opens into the adjacent space and the outside, and is capable of blowing inside air taken in from the adjacent space exhaust port side toward the outside, The operation control means stops the adjacent space exhaust fan in the normal ventilation mode, and operates the adjacent space exhaust fan as the adjacent space exhaust means in the disaster ventilation mode.

[0008] According to this configuration, it is possible to adopt a rational and simple configuration in which the adjacent space exhaust fan, which is stopped during normal times when the operation is performed in the normal ventilation mode, is operated during a disaster when the operation is performed in the disaster ventilation mode. Then, the amount of exhaust air from the adjacent space in the disaster ventilation mode is increased compared to the normal ventilation mode, so that a sufficient amount of outside air can be moved from the living room to the adjacent space through the path duct during a disaster.

[0009] A third characteristic configuration of the present invention is a method for making a space for a living room, comprising: providing an adjacent space air supply path that connects the outside and an adjacent space air supply port that opens into the adjacent space; and providing an adjacent space air supply fan that can blow outside air taken in from the outside toward the adjacent space air supply port; The operation control means stops the adjacent space supply air fan in the normal ventilation mode, and operates the adjacent space supply air fan in the disaster ventilation mode.

[0010] According to this configuration, it is possible to adopt a rational and simple configuration in which the adjacent space supply air fan, which is stopped during normal times when the system is operated in the normal ventilation mode, is operated during a disaster when the system is operated in the disaster ventilation mode. Then, the supply volume of outside air to the adjacent space in the disaster ventilation mode is increased compared to the normal ventilation mode, so that a sufficient amount of outside air can be supplied to the adjacent space during a disaster.

[0011] A fourth characteristic configuration of the present invention is a room exhaust port opening into the room, an adjacent space exhaust port that opens into the adjacent space; a common exhaust fan that is provided in a common exhaust path that connects an inside air intake section that can ventilate the living room exhaust port and the adjacent space exhaust port with the outside, and that can blow the inside air taken in from the inside air intake section side toward the outside; an exhaust port switching means for switching an exhaust port ventilated to the inside air intake section between the living room exhaust port and the adjacent space exhaust port, The operation control means, in the normal ventilation mode, causes the exhaust port switching means to ventilate the living room exhaust port to the inside air intake section of the common exhaust path, thereby operating the common exhaust fan as the living room exhaust means, and, in the disaster ventilation mode, causes the exhaust port switching means to ventilate the adjacent space exhaust port to the inside air intake section of the common exhaust path, thereby operating the common exhaust fan as the adjacent space exhaust means.

[0012] According to this configuration, during normal times when the unit is operated in the normal ventilation mode, the exhaust port switching means ventilates the occupant room exhaust port opening into the occupant room to the inside air intake section of the common exhaust path, thereby operating the common exhaust fan as occupant room exhaust means capable of exhausting inside air from the occupant room to the outside through the common exhaust path. On the other hand, during a disaster when the unit is operated in the disaster ventilation mode, the exhaust port switching means ventilates the adjacent space exhaust port opening into the adjacent space to the inside air intake section of the common exhaust path, thereby operating the common exhaust fan as adjacent space exhaust means capable of exhausting inside air from the adjacent space to the outside through the common exhaust path. Furthermore, since the living room exhaust means and the adjacent space exhaust means can be configured to utilize a common exhaust path and a common exhaust fan, an even more rational and simplified configuration can be realized.

[0013] A fifth characteristic configuration of the present invention is a method for constructing a building having a plurality of rooms, The ventilation mode switching means is configured to be able to switch the set ventilation mode between the normal ventilation mode and the disaster ventilation mode individually in each of the plurality of rooms.

[0014] According to this configuration, in the event of a disaster in which the adjacent space is used as an evacuation room, a room that is one of the multiple rooms and is used as an evacuation room can be used as an evacuation room. For a room that is used as an evacuation room in which the number of occupants increases compared to normal times, the set ventilation mode in which the operation control means operates can be maintained in the normal ventilation mode without switching to the disaster ventilation mode, thereby ensuring and sufficient ventilation by direct intake of outside air and direct exhaust of inside air. In addition, in the event of a disaster, for the remaining rooms among the multiple rooms that are not used as evacuation rooms, as described above, the set ventilation mode operated by the operation control means can be switched to the disaster ventilation mode, and the outside air supplied to the rooms that are not used as evacuation rooms can be moved to the adjacent space through the path duct, thereby enhancing ventilation in the adjacent space. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a plan view showing the ventilation system configuration and normal state according to a first embodiment; [Diagram 2] FIG. 1 is a plan view showing the ventilation system configuration according to the first embodiment and its state during a disaster; [Diagram 3] FIG. 11 is a plan view showing the ventilation system configuration and normal state according to the second embodiment; [Figure 4] FIG. 11 is a plan view showing the ventilation system configuration according to the second embodiment and the state during a disaster. [Diagram 5] FIG. 11 is a plan view showing the ventilation system configuration and normal state according to the third embodiment; [Figure 6] FIG. 11 is a plan view showing the ventilation system configuration according to the third embodiment and the state during a disaster. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] An embodiment of a ventilation system according to the present invention will be described with reference to the drawings. In each drawing, an open damper is shown in white, a closed damper is shown in black, a duct through which air flows is shown in solid lines, and a duct through which air does not flow is shown in dashed lines.

[0017] 1 and other figures, a building 1 in which a ventilation system according to this embodiment (hereinafter referred to as "this ventilation system") is installed is provided with multiple rooms R1, R2, and R3, and a corridor H, which is an adjacent space adjacent to the multiple rooms R1, R2, and R3. This ventilation system is mainly provided with room air supply means RI capable of supplying outside air OA from the outdoors O (an example of the outside) to the rooms R1, R2, and R3 as supply air SA, and room exhaust means RE capable of discharging room air RA from the rooms R1, R2, and R3 to the outdoors O as exhaust air EA.

[0018] In this embodiment, the adjacent space is the corridor H, but it may be another space such as an entrance. Also, in this embodiment, for the sake of simplicity, three rooms, the first room R1, the second room R2, and the third room R3, are illustrated as rooms adjacent to the same corridor H, but the number of rooms can be changed as appropriate.

[0019] In Building 1, this ventilation system is designed to accommodate a so-called BCP, in the event of a disaster such as a large-scale earthquake, in which corridor H would be used as an evacuation room for evacuees while business or residence could continue in at least some of the above-mentioned rooms R1, R2, and R3. That is, the present ventilation system, the specific configuration of which will be described later, is configured to employ a rational and simple configuration and to increase the supply of outside air OA to the corridor H, which will be used as an evacuation room in the event of a disaster and in which the number of occupants will increase compared to normal times. The details of the first to third embodiments of the present ventilation system will be described below in order.

[0020] [First embodiment] A first embodiment of the ventilation system will be described with reference to Figs.

[0021] Each of the rooms R1, R2, and R3 is provided with an individual room air conditioner 10. Each of these individual room air conditioners 10 is provided with a room supply air fan 11 that operates as the room supply air means RI, a room exhaust fan 12 that operates as the room exhaust means RE, and a total heat exchanger 15.

[0022] Living room supply air fan 11 is provided in an air supply path connecting the outdoors O and living room air supply ports 45 that open to living rooms R1, R2, and R3, and is configured as a fan capable of blowing outside air OA taken in from the outdoors O toward the living room air supply port 45. That is, by operating living room supply air fan 11, the outside air OA taken in from the outdoors O is supplied to living rooms R1, R2, and R3 through the living room air supply port 45 as supply air SA.

[0023] The living room exhaust fan 12 is provided in an exhaust path connecting the living room exhaust port 38 that opens into the living rooms R1, R2, R3 and the outdoors O, and is configured as a fan that can blow the indoor air RA taken in from the living room exhaust port 38 toward the outdoors O. That is, by operating the living room exhaust fan 12, the indoor air RA taken in from the living rooms R1, R2, R3 through the living room exhaust port 38 is discharged to the outdoors O as exhaust air EA.

[0024] The total heat exchanger 15 is configured to perform total heat exchange between the exhaust air EA discharged to the outdoors O by the room exhaust fan 12 and the outside air OA taken in from the outdoors O by the room supply air fan 11. By providing such a total heat exchanger 15, the exhaust heat of the exhaust air EA discharged to the outdoors O can be recovered by the outside air OA taken in from the outdoors O, thereby reducing the air conditioning load indoors in rooms R1, R2, R3, etc.

[0025] A corridor supply air fan 31 (an example of an adjacent space supply air fan) and a corridor exhaust fan 32 (an example of an adjacent space exhaust fan) are provided in the corridor H. The corridor supply air fan 31 operates as a corridor air supply means HI (an example of an adjacent space supply means) that can supply outside air OA from the outdoors O to the corridor H as supply air SA. The corridor exhaust fan 32 operates as a corridor exhaust means HE (an example of an adjacent space exhaust means) that can exhaust inside air RA from the corridor H to the outdoors O as exhaust air EA.

[0026] The corridor supply air fan 31 is provided in a corridor air supply path 48 (an example of an adjacent space air supply path) that connects the outdoors O and a corridor air supply port 49 (an example of an adjacent space air supply port) that opens to the corridor H, and is configured as a fan that can blow outside air OA taken in from the outdoors O toward the corridor air supply port 49. That is, by operating the corridor supply air fan 31, the outside air OA taken in from the outdoors O is supplied to the corridor H through the corridor air supply port 49 as supply air SA.

[0027] The corridor exhaust fan 32 is provided in a corridor exhaust path 51 (adjacent space exhaust path) that connects a corridor exhaust port 52 (adjacent space exhaust port) that opens into the corridor H with the outdoors O (outside), and is configured as a fan that can blow the indoor air RA taken in from the corridor exhaust port 52 (adjacent space exhaust port) side toward the outdoors O (outside). That is, by operating the corridor exhaust fan 32, the indoor air RA taken in from the corridor H through the corridor exhaust port 52 is discharged to the outdoors O as exhaust air EA.

[0028] Furthermore, in this ventilation system, a path duct 60 connecting a room-side air vent 62 opening into the rooms R1, R2, R3 and a corridor-side air vent 61 opening into the corridor H is provided for each of the rooms R1, R2, R3.

[0029] This ventilation system is provided with a control device 70 that controls the operation of room supply air fans 11 and room exhaust fans 12 of individual room air conditioners 10 provided individually for each of rooms R1, R2, R3, and the corridor supply air fan 31 and exhaust fan 32 provided in corridor H. The control device 70 functions as an operation control means 71 and a ventilation mode switching means 72 by executing a predetermined computer program.

[0030] The operation control means 71 is a means for supplying outside air OA to rooms R1, R2, and R3 as supply air SA using the room supply air means RI (room supply air fan 11), while controlling the room exhaust means RE (room exhaust fan 12) and the corridor exhaust means HE (corridor exhaust fan 32) to operate in a predetermined set ventilation mode.

[0031] The ventilation mode switching means 72 is a means capable of switching the set ventilation mode between a predetermined normal ventilation mode and a predetermined disaster ventilation mode individually in each of the multiple rooms R1, R2, and R3. Note that the switching between the normal ventilation mode and the disaster ventilation mode by the ventilation mode switching means 72 can be performed manually by, for example, an administrator.

[0032] The normal ventilation mode is a ventilation mode in which the room exhaust means RE (room exhaust fan 12) exhausts the room air RA from the rooms R1, R2, and R3 as exhaust air EA. This normal ventilation mode is set for all the rooms R1, R2, and R3 mainly during normal times (see FIG. 1).

[0033] On the other hand, the disaster ventilation mode is a ventilation mode in which the exhaust air volume of the indoor air RA from the rooms R1, R2, R3 by the room exhaust means RE (room exhaust fan 12) is reduced compared to the normal ventilation mode, and the exhaust air volume of the indoor air RA from the corridor H by the corridor exhaust means HE (exhaust fan 32) is increased compared to the normal ventilation mode, thereby increasing the movement air volume of the indoor air RA from the rooms R1, R2, R3 to the corridor H through the path duct 60 compared to the normal ventilation mode. This disaster ventilation mode is set mainly for at least one of the rooms R1, R2, R3 during a disaster (see FIG. 2).

[0034] Below, details of the normal ventilation mode and disaster ventilation mode executed for each of the rooms R1, R2, and R3 in normal conditions (see FIG. 1) and disaster conditions (see FIG. 2) will be described.

[0035] (normal times) Figure 1 shows the state of this ventilation system during normal times when corridor H is not being used as an evacuation room. During normal times, in all of the rooms R1, R2, and R3, the ventilation mode switching means 72 sets the set ventilation mode to the normal ventilation mode, and the operation control means 71 operates in the normal ventilation mode.

[0036] During normal times, in all of the rooms R1, R2, and R3 that are operated in the normal ventilation mode, the room supply air fan 11 and the room exhaust fan 12 are operated at a predetermined set air volume. Then, in all of the occupant rooms R1, R2, R3, operation of the occupant room supply air fans 11 causes outside air OA to be directly supplied to all of the occupant rooms R1, R2, R3 through the occupant room supply air ports 45 as supply air SA, and operation of the occupant room exhaust fans 12 causes inside air RA to be directly exhausted from all of the occupant rooms R1, R2, R3 through the occupant room exhaust ports 38 as exhaust air EA. As a result, under normal circumstances, at least in the occupant rooms R1, R2, R3, the direct supply of outside air OA and the direct exhaust of inside air RA ensures sufficient ventilation.

[0037] In all rooms R1, R2, R3 operating in normal ventilation mode, the direct air supply volume through the room air supply port 45 for outdoor air OA by the room supply fan 11 and the direct air exhaust volume through the room exhaust port 38 for indoor air RA by the room exhaust fan 12 are approximately the same air volume, so the volume of indoor air RA moving from rooms R1, R2, R3 to corridor H through path duct 60 is approximately zero.

[0038] Furthermore, under normal circumstances, since there are very few occupants in the corridor H, the operation of the corridor supply air fan 31 and the corridor exhaust fan 32 is stopped. Note that the corridor supply air fan 31 and the corridor exhaust fan 32 may be operated at a smaller set air volume to ventilate the corridor H in accordance with the small number of occupants.

[0039] (In the event of a disaster) Figure 2 shows the state of this ventilation system during a disaster when corridor H is being used as an evacuation room. In the event of a disaster, in the first room R1 and the third room R3, which are some of the rooms, the set ventilation mode is set to the disaster ventilation mode by the ventilation mode switching means 72, and operation is performed in the disaster ventilation mode by the operation control means 71. On the other hand, in the second room R2, which is the remaining room, operation in the normal ventilation mode described above continues, and reliable and sufficient ventilation is performed as in normal times.

[0040] In the event of a disaster, in all rooms R1, R2, and R3 that are operated in the normal ventilation mode and the disaster ventilation mode, the room supply air fans 11 are operated at a predetermined set air volume. Then, in all of the rooms R1, R2, R3, the outside air OA is directly supplied as supply air SA through the room supply air ports 45 by the operation of the room supply air fans 11.

[0041] Regarding exhaust during a disaster, the resident room exhaust fan 12 is operated in the second resident room R2, which operates in the normal ventilation mode. However, the resident room exhaust fan 12 is stopped in the first resident room R1 and the third resident room R3, which operate in the disaster ventilation mode.

[0042] Then, in the second occupant room R2 operating in normal ventilation mode, just as in the normal state described above, the direct airflow rate of outside air OA supplied by the room supply fan 11 through the room supply port 45 and the direct airflow rate of indoor air RA supplied by the room exhaust fan 12 through the room exhaust port 38 are approximately the same, so the amount of indoor air RA moving from the occupant rooms R1, R2, R3 to the corridor H through the path duct 60 is approximately zero. Then, in the second occupant room R2, ventilation similar to that in normal state is performed.

[0043] On the other hand, in the first room R1 and the third room R3 operating in the disaster ventilation mode, the direct exhaust airflow rate of the room air RA by the room exhaust fan 12 through the room exhaust port 38 becomes approximately zero, which is reduced compared to when operating in the normal ventilation mode. As a result, the direct supply airflow rate of the outside air OA through the room supply port 45 to the first room R1 and the third room R3 becomes greater than the direct exhaust airflow rate of the room air RA from the first room R1 and the third room R3 through the room exhaust port 38.

[0044] In addition, the hallway supply air fan 31 is operated at a predetermined set air volume, and the hallway exhaust fan 32 is operated at a predetermined set air volume larger than that of the hallway supply air fan 31. As a result, in the hallway H, the direct exhaust air volume of the inside air RA by the hallway exhaust fan 32 through the hallway exhaust port 52 becomes larger than the direct intake air volume of the outside air OA by the hallway supply air fan 31 through the hallway intake port 49. As a result, the outside air OA supplied as supply air SA to the first room R1 and the third room R3 becomes more likely to move to the corridor H through the path duct 60, and the amount of air moving as the inside air RA from the first room R1 and the third room R3 to the corridor H through the path duct 60 increases compared to the normal ventilation mode.

[0045] As described above, when the first living room R1 and the third living room R3 are operated in the disaster ventilation mode, the first living room R1 and the third living room R3 are reliably and sufficiently ventilated by the direct supply of outside air OA to the extent that business or residence can continue. In addition, the hallway H, which is used as an evacuation room and therefore has a higher number of occupants than usual, is rationally ventilated by using the outside air OA that moves from the first living room R1 and the third living room R3 to the hallway H through the path duct 60.

[0046] In this embodiment, during normal times (FIG. 1) when operation is performed in normal ventilation mode in all of the rooms R1, R2, and R3, the corridor supply air fan 31 is stopped. On the other hand, during a disaster (FIG. 2) when operation is performed in disaster ventilation mode in at least some of the rooms R1 and R2, the corridor supply air fan 31 is operated. As a result, the direct supply air volume of the outside air OA to the corridor H in the disaster ventilation mode is increased compared to the normal ventilation mode, and a sufficient amount of outside air OA is supplied to the corridor H in the event of a disaster.

[0047] Furthermore, since the outside air OA supplied as supply air SA to rooms R1, R2, and R3 is supplied to the corridor H through path duct 60, the corridor supply air fan 31 can be a simplified one with a small blowing capacity or can be omitted.

[0048] In addition, in this embodiment, in the event of a disaster, operation is performed in disaster ventilation mode in some of the rooms R1, R3, and operation is performed in normal ventilation mode in the remaining room R2, but operation in disaster ventilation mode may also be performed in all of the rooms R1, R2, R3.

[0049] In this embodiment, individual room air conditioners 10 are provided for each of the rooms R1, R2, and R3. However, instead of these individual room air conditioners 10, a shared outdoor air processing air conditioner may be provided for each of the rooms R1, R2, and R3, like the outdoor air processing air conditioner 20 of the third embodiment described later (see Figures 5 and 6).

[0050] [Second embodiment] A second embodiment of the ventilation system will be described with reference to Figures 3 and 4. Note that the same reference numerals are used for configurations similar to those of the above-mentioned embodiment, and descriptions thereof may be omitted.

[0051] In this embodiment, similarly to the above-described embodiment, each of the rooms R1, R2, and R3 is provided with an individual room air conditioner 10 and a path duct 60. In the hallway H, a hallway supply air fan 31 and a hallway exhaust fan 32 are provided.

[0052] In the individual room air conditioners 10 provided for each of the rooms R1, R2, and R3, a corridor exhaust port 41 (one example of an adjacent space exhaust port) that opens to the corridor H is provided in addition to the living room exhaust port 38 that opens to the living room R1, R2, and R3. Furthermore, a living room exhaust fan 12 is provided in a common exhaust path 35 that connects an inside air intake 36 that can ventilate to the living room exhaust port 38 and the corridor exhaust port 41 and the outside O. The living room exhaust fan 12 functions as a common exhaust fan that can blow the inside air RA taken in from the inside air intake 36 side toward the outside O. Therefore, in the following description of this embodiment, the living room exhaust fan 12 is referred to as a common exhaust fan 12.

[0053] Furthermore, the duct connecting the living room exhaust port 38 and the room air intake section 36 is provided with a living room exhaust damper 39 that can interrupt the intake of the room air RA into the living room exhaust port 38. Meanwhile, the duct connecting the hallway exhaust port 41 and the room air intake section 36 is provided with a corridor exhaust damper 42 that can interrupt the intake of the room air RA into the hallway exhaust port 41. That is, by opening the living room exhaust damper 39 and closing the corridor exhaust damper 42, the exhaust port ventilated to the indoor air intake section 36 is set to the living room exhaust port 38 (see FIG. 3), and by closing the living room exhaust damper 39 and opening the corridor exhaust damper 42, the exhaust port ventilated to the indoor air intake section 36 is set to the corridor exhaust port 41 (see FIG. 4). Thus, these dampers 39, 42 function as exhaust port switching means that can switch the exhaust port ventilated to the indoor air intake section 36 that is connected to the primary side of the common exhaust fan 12 between the living room exhaust port 38 and the corridor exhaust port 41.

[0054] Then, by opening the living room exhaust damper 39 and closing the corridor exhaust damper 42, the common exhaust fan 12 is operated with the exhaust port ventilated to the indoor air intake section 36 set to the living room exhaust port 38. Then, the common exhaust fan 12 operates as a living room exhaust means RE capable of discharging indoor air RA from the living rooms R1, R2, and R3 to the outdoors O through the living room exhaust port 38 as exhaust air EA. In other words, by operating the common exhaust fan 12 with the living room exhaust damper 39 open and the corridor exhaust damper 42 closed, the indoor air RA taken in from the living rooms R1, R2, and R3 through the living room exhaust port 38 is discharged to the outdoors O as exhaust air EA.

[0055] On the other hand, the common exhaust fan 12 is operated with the exhaust port ventilated to the indoor air intake section 36 set to the corridor exhaust port 41 by closing the living room exhaust damper 39 and opening the corridor exhaust damper 42. Then, the common exhaust fan 12 operates as a corridor exhaust means HE capable of discharging indoor air RA as exhaust air EA from the corridor H to the outside O through the corridor exhaust port 41. By operating the common exhaust fan 12 with the living room exhaust damper 39 closed and the corridor exhaust damper 42 open, the indoor air RA taken in from the corridor H through the corridor exhaust port 41 is discharged to the outside O as exhaust air EA.

[0056] The control device 70 controls the operation of the room supply air fan 11, the common exhaust fan 12, the corridor supply air fan 31, and the exhaust fan 32, as well as controls the operation of the dampers 39, 42 which function as the exhaust port switching means, and functions as an operation control means 71 and a ventilation mode switching means 72. Below, details of the normal ventilation mode and the disaster ventilation mode executed for each of the rooms R1, R2, and R3 in normal conditions (see FIG. 3) and in disaster conditions (see FIG. 4) will be described.

[0057] (normal times) Figure 3 shows the state of this ventilation system during normal times when corridor H is not being used as an evacuation room. During normal times, in all of the rooms R1, R2, and R3, the ventilation mode switching means 72 sets the set ventilation mode to the normal ventilation mode, and the operation control means 71 operates in the normal ventilation mode.

[0058] During normal times, in all of the rooms R1, R2, and R3 operating in normal ventilation mode, the room exhaust dampers 39 are opened and the corridor exhaust dampers 42 are closed, switching the exhaust port ventilated to the indoor air intake section 36 to the room exhaust port 38. Then, the room supply air fans 11 and the common exhaust fan 12 are operated at a predetermined set air volume. Then, operation of the room supply air fans 11 causes outside air OA to be directly supplied as supply air SA to all of the rooms R1, R2, R3 through the room supply air ports 45, and operation of the common exhaust fan 12 as the room exhaust means RE causes inside air RA to be directly exhausted as exhaust air EA from all of the rooms R1, R2, R3 through the room exhaust ports 38. As a result, under normal circumstances, at least the rooms R1, R2, R3 are reliably and sufficiently ventilated by the direct supply of outside air OA and the direct exhaust of inside air RA.

[0059] In all rooms R1, R2, R3 operating in this normal ventilation mode, the direct air supply volume through the room air supply port 45 for outdoor air OA by the room supply fan 11 and the direct air exhaust volume through the room exhaust port 38 for indoor air RA by the common exhaust fan 12 are approximately the same air volume, so the volume of indoor air RA moving from rooms R1, R2, R3 to the corridor H through the path duct 60 is approximately zero.

[0060] (In the event of a disaster) Figure 4 shows the state of this ventilation system during a disaster when corridor H is being used as an evacuation room. In the event of a disaster, in the first room R1 and the third room R3, which are some of the rooms, the set ventilation mode is set to the disaster ventilation mode by the ventilation mode switching means 72, and operation is performed in the disaster ventilation mode by the operation control means 71. On the other hand, in the second room R2, which is the remaining room, operation in the normal ventilation mode described above continues, and reliable and sufficient ventilation is performed as in normal times.

[0061] In the event of a disaster, in all rooms R1, R2, and R3 operating in normal ventilation mode and disaster ventilation mode, the room supply air fans 11 are operated at a predetermined set air volume, and outside air OA is directly supplied through the room air supply port 45 as supply air SA.

[0062] Regarding exhaust during a disaster, in the second occupant room R2, which operates in normal ventilation mode, the common exhaust fan 12 is operated at a predetermined set airflow rate with the occupant room exhaust damper 39 open and the corridor exhaust damper 42 closed. However, in the first occupant room R1 and the third occupant room R3, which operate in disaster ventilation mode, the common exhaust fan 12 is operated at a predetermined set airflow rate with the occupant room exhaust damper 39 closed and the corridor exhaust damper 42 open.

[0063] Then, in the second room R2 operating in the normal ventilation mode, just as in the normal state described above, the direct airflow rate of outside air OA supplied by room supply fan 11 through room air supply port 45 and the direct airflow rate of indoor air RA exhausted by common exhaust fan 12 through room exhaust port 38 are approximately the same, so the amount of indoor air RA moving from the second room R2 to the corridor H through path duct 60 is approximately zero. Then, ventilation similar to that in normal state is performed in the second room R2.

[0064] On the other hand, in the first room R1 and the third room R3 operating in the disaster ventilation mode, the direct exhaust airflow rate of the inside air RA by the common exhaust fan 12 through the room exhaust port 38 becomes approximately zero, which is reduced compared to when operating in the normal ventilation mode. As a result, the direct supply airflow rate of the outside air OA through the room supply port 45 to the first room R1 and the third room R3 becomes greater than the direct exhaust airflow rate of the inside air RA from the first room R1 and the third room R3 through the room exhaust port 38. In addition, in the first and third rooms R1 and R3 that are operated in the disaster ventilation mode, the common exhaust fan 12 is operated and the corridor exhaust dampers 42 corresponding to the first and third rooms R1 and R3 are opened. Furthermore, the corridor supply air fan 31 and the corridor exhaust fan 32 are operated at substantially the same predetermined set air volume. As a result, in the corridor H, the direct exhaust air volume of the inside air RA by the common exhaust fan 12 and the corridor exhaust fan 32 through the corridor exhaust ports 41, 52 becomes larger than the direct supply air volume of the outside air OA by the corridor supply air fan 31 through the corridor supply air port 49. As a result, the outside air OA supplied as supply air SA to the first room R1 and the third room R3 becomes more likely to move to the corridor H through the path duct 60, and the amount of air moving as the inside air RA from the first room R1 and the third room R3 to the corridor H through the path duct 60 increases compared to the normal ventilation mode.

[0065] As described above, when the first living room R1 and the third living room R3 are operated in the disaster ventilation mode, the first living room R1 and the third living room R3 are reliably and sufficiently ventilated by the direct supply of outside air OA to the extent that business or residence can continue. In addition, the hallway H, which is used as an evacuation room and therefore has a higher number of occupants than usual, is rationally ventilated by using the outside air OA that moves from the first living room R1 and the third living room R3 to the hallway H through the path duct 60.

[0066] Furthermore, since the outside air OA supplied as supply air SA to rooms R1, R2, and R3 is supplied to the corridor H through path duct 60, the corridor supply air fan 31 can be a simplified one with a small blowing capacity or can be omitted. In addition, in the event of a disaster (Figure 4), the common exhaust fan 12 exhausts the inside air RA in the corridor H to the outdoors O through the corridor exhaust port 41, so the dedicated corridor exhaust fan 32 operating as the corridor exhaust means HE can be a simplified one with a small blowing capacity or can be omitted.

[0067] In addition, in this embodiment, in the event of a disaster, operation is performed in disaster ventilation mode in some of the rooms R1, R3, and operation is performed in normal ventilation mode in the remaining room R2, but operation in disaster ventilation mode may also be performed in all of the rooms R1, R2, R3.

[0068] In this embodiment, individual room air conditioners 10 are provided for each of the rooms R1, R2, and R3. However, instead of these individual room air conditioners 10, a shared outdoor air processing air conditioner may be provided for each of the rooms R1, R2, and R3, like the outdoor air processing air conditioner 20 of the third embodiment described later (see Figures 5 and 6).

[0069] [Third embodiment] A third embodiment of the ventilation system will be described with reference to Figures 5 and 6. Note that the same reference numerals are used for configurations similar to those of the above-mentioned embodiments, and descriptions thereof may be omitted.

[0070] In this embodiment, similarly to the above-described embodiment, each of the living rooms R1, R2, R3 is provided with a path duct 60, but instead of the individual living room air conditioners 10 (see Figs. 1 to 4) provided in the above-described embodiment, a shared outdoor air processing air conditioner 20 is provided for each of the living rooms R1, R2, R3. This outdoor air processing air conditioner 20 is provided with a living room supply air fan 21 that operates as the living room supply means RI, a living room exhaust fan 22 that operates as the living room exhaust means RE, and a total heat exchanger 25.

[0071] The room air supply fan 21 is provided in an air supply path connecting the outdoors O with room air supply ports 45 opening into each of the rooms R1, R2, and R3, and is configured as a fan capable of blowing the outside air OA taken in from the outdoors O side toward each of the room air supply ports 45.

[0072] The room exhaust fan 22 is provided in a common exhaust path 35 connecting the room exhaust ports 38 opening into each of the rooms R1, R2, and R3 with the outdoors O, and is configured as a fan capable of blowing the indoor air RA taken in from the room exhaust port 38 side toward the outdoors O.

[0073] The total heat exchanger 25 is configured to perform total heat exchange between the exhaust air EA discharged to the outdoors O by the room exhaust fan 22 and the outside air OA taken in from the outdoors O by the room supply air fan 21. By providing such a total heat exchanger 25, the exhaust heat of the exhaust air EA discharged to the outdoors O can be recovered by the outside air OA taken in from the outdoors O, thereby reducing the air conditioning load indoors in rooms R1, R2, R3, etc.

[0074] In the outdoor air processing air conditioner 20, in addition to the living room exhaust ports 38 that open to the respective living rooms R1, R2, and R3, a corridor exhaust port 41 (an example of an adjacent space exhaust port) that opens to the corridor H is provided. Furthermore, a living room exhaust fan 22 is provided in a common exhaust path 35 that connects an inside air intake section 36 that can ventilate to the living room exhaust ports 38 and the corridor exhaust port 41 and the outdoors O. The living room exhaust fan 22 functions as a common exhaust fan that can blow the inside air RA taken in from the inside air intake section 36 side toward the outdoors O. Therefore, in the following description of this embodiment, the living room exhaust fan 22 will be referred to as a common exhaust fan 22.

[0075] Furthermore, similarly to the second embodiment described above, a duct connecting the living room exhaust port 38 and the room air intake section 36 is provided with a living room exhaust damper 39 that can interrupt the intake of room air RA into the living room exhaust port 38. Meanwhile, a duct connecting the corridor exhaust port 41 and the room air intake section 36 is provided with a corridor exhaust damper 42 that can interrupt the intake of room air RA into the corridor exhaust port 41. That is, by opening the living room exhaust damper 39 and closing the corridor exhaust damper 42, the exhaust port ventilated to the indoor air intake section 36 is set to the living room exhaust port 38 (see FIG. 5), and by closing the living room exhaust damper 39 and opening the corridor exhaust damper 42, the exhaust port ventilated to the indoor air intake section 36 is set to the corridor exhaust port 41 (see FIG. 6). Thus, these dampers 39, 42 function as exhaust port switching means that can switch the exhaust port ventilated to the indoor air intake section 36 that is connected to the primary side of the common exhaust fan 22 between the living room exhaust port 38 and the corridor exhaust port 41.

[0076] Then, in each of the living rooms R1, R2, R3, the common exhaust fan 22 is operated with the exhaust port ventilated to the indoor air intake section 36 set to the living room exhaust port 38 by opening the living room exhaust damper 39. Then, the common exhaust fan 22 operates as a living room exhaust means RE capable of discharging indoor air RA as exhaust air EA through the living room exhaust port 38 for the specific living room R1, R2, R3. That is, by opening the living room exhaust damper 39 in each of the living rooms R1, R2, R3 with the common exhaust fan 22 operated, the indoor air RA taken in from the living room R1, R2, R3 through the living room exhaust port 38 is discharged to the outdoors O as exhaust air EA.

[0077] Meanwhile, in the corridor H, the common exhaust fan 22 is operated with the corridor exhaust damper 42 opened to set the exhaust port ventilated to the indoor air intake 36 to the corridor exhaust port 41. Then, the common exhaust fan 22 operates as a corridor exhaust means HE capable of discharging indoor air RA as exhaust air EA from the corridor H through the corridor exhaust port 41 to the outside O for the specific occupants R1, R2, R3. That is, with the common exhaust fan 22 operated, the corridor exhaust damper 42 is opened in each of the occupants R1, R2, R3, so that the indoor air RA taken in from the corridor H through the corridor exhaust port 41 is discharged to the outside O as exhaust air EA. Furthermore, with respect to the common exhaust path 35, the connection point of the duct connecting the corridor exhaust port 41 and the indoor air intake 36 is located closer to the common exhaust fan 22 than the connection point of the duct connecting the living room exhaust port 38 and the indoor air intake 36. This makes it possible to shorten the length of the duct from the corridor exhaust port 41 to the common exhaust fan 22 through the common exhaust path 35 as much as possible, and to suppress as much as possible an increase in pressure loss occurring in the duct when the indoor air RA taken in from the corridor exhaust port 41 by the common exhaust fan 22 is exhausted to the outdoors O at a relatively large volume.

[0078] In addition to controlling the operation of the room supply air fan 21 and the common exhaust fan 22, the control device 70 also controls the operation of the dampers 39, 42 which function as the exhaust port switching means, and functions as an operation control means 71 and a ventilation mode switching means 72. Below, details of the normal ventilation mode and the disaster ventilation mode executed for each of the rooms R1, R2, and R3 in normal conditions (see FIG. 5) and in disaster conditions (see FIG. 6) will be described.

[0079] (normal times) Figure 5 shows the state of this ventilation system during normal times when corridor H is not being used as an evacuation room. During normal times, in all of the rooms R1, R2, and R3, the ventilation mode switching means 72 sets the set ventilation mode to the normal ventilation mode, and the operation control means 71 operates in the normal ventilation mode.

[0080] The room exhaust dampers 39 in all rooms R1, R2, R3 operating in normal ventilation mode are opened, and the corridor exhaust damper 42 in the corridor H is closed, so that the exhaust ports ventilated to the indoor air intake section 36 are switched to the room exhaust ports 38 in all rooms R1, R2, R3. Then, the room supply air fans 21 and the common exhaust fan 22 are operated at a predetermined set air volume. Then, in all of the living rooms R1, R2, R3, the operation of the living room supply air fans 21 causes outside air OA to be directly supplied as supply air SA through the living room supply air port 45, and the operation of the common exhaust fan 22 causes the inside air RA to be directly exhausted as exhaust air EA through the living room exhaust port 38. As a result, under normal circumstances, at least in the living rooms R1, R2, R3, the direct supply of outside air OA and the direct exhaust of inside air RA ensures sufficient ventilation.

[0081] In all rooms R1, R2, R3 operating in this normal ventilation mode, the direct air supply volume through the room air supply port 45 for outdoor air OA by the room supply fan 21 and the direct air exhaust volume through the room exhaust port 38 for indoor air RA by the common exhaust fan 22 are approximately the same air volume, so the volume of indoor air RA moving from rooms R1, R2, R3 to the corridor H through the path duct 60 is approximately zero.

[0082] (In the event of a disaster) Figure 6 shows the state of this ventilation system during a disaster when corridor H is being used as an evacuation room. In the event of a disaster, in the first room R1 and the third room R3, which are some of the rooms, the set ventilation mode is set to the disaster ventilation mode by the ventilation mode switching means 72, and operation is performed in the disaster ventilation mode by the operation control means 71. On the other hand, in the second room R2, which is the remaining room, operation in the normal ventilation mode described above continues, and reliable and sufficient ventilation is performed as in normal times.

[0083] In the event of a disaster, in all rooms R1, R2, and R3 operating in normal ventilation mode and disaster ventilation mode, the room supply air fans 21 are operated at a predetermined set air volume, and outside air OA is directly supplied through the room air supply port 45 as supply air SA.

[0084] Regarding exhaust during a disaster, in the second occupant room R2, which is operated in normal ventilation mode, the common exhaust fan 22 is operated at a predetermined set air volume and the occupant room exhaust damper 39 is opened. However, in the first occupant room R1 and the third occupant room R3, which are operated in disaster ventilation mode, the common exhaust fan 22 is operated at a predetermined set air volume and the occupant room exhaust damper 39 is closed. Furthermore, in the hallway H, the hallway exhaust damper 42 is opened.

[0085] Then, in the second room R2 operating in the normal ventilation mode, just like in the normal state, the direct airflow rate of outside air OA supplied by room supply fan 21 through room air supply port 45 and the direct airflow rate of indoor air RA exhausted by common exhaust fan 22 through room exhaust port 38 are approximately the same, so the amount of indoor air RA moving from the second room R2 to the corridor H through path duct 60 is approximately zero. Then, in the second room R2, ventilation is performed in the same way as in the normal state.

[0086] On the other hand, in the first room R1 and the third room R3 operating in the disaster ventilation mode, the direct exhaust airflow rate of the inside air RA by the common exhaust fan 22 through the room exhaust port 38 becomes approximately zero, which is reduced compared to when operating in the normal ventilation mode. As a result, the direct supply airflow rate of the outside air OA through the room supply port 45 to the first room R1 and the third room R3 becomes greater than the direct exhaust airflow rate of the inside air RA from the first room R1 and the third room R3 through the room exhaust port 38. In addition, when operating in the disaster ventilation mode in the first room R1 and the third room R3, the hallway exhaust damper 42 is opened while the common exhaust fan 22 is in operation. As a result, in the hallway H, the direct exhaust airflow rate of the indoor air RA by the common exhaust fan 22 through the hallway exhaust port 41 becomes larger than the direct supply airflow rate, which is approximately zero. As a result, the outside air OA supplied as supply air SA to the first room R1 and the third room R3 becomes more likely to move to the corridor H through the path duct 60, and the amount of air moving as the inside air RA from the first room R1 and the third room R3 to the corridor H through the path duct 60 increases compared to the normal ventilation mode.

[0087] As described above, when the first living room R1 and the third living room R3 are operated in the disaster ventilation mode, the first living room R1 and the third living room R3 are reliably and sufficiently ventilated by the direct supply of outside air OA to the extent that business or residence can continue. In addition, the hallway H, which is used as an evacuation room and therefore has a higher number of occupants than usual, is rationally ventilated by using the outside air OA that moves from the first living room R1 and the third living room R3 to the hallway H through the path duct 60.

[0088] In this embodiment, in the event of a disaster, some of the rooms R1 and R3 are operated in disaster ventilation mode, and the remaining room R2 is operated in normal ventilation mode, but it is also possible to operate in disaster ventilation mode in all of the rooms R1, R2, and R3. [Explanation of symbols]

[0089] 1. Building 12 Common exhaust fan 22 Common exhaust fan 31 Corridor air supply fan (adjacent space air supply fan) 32 Corridor exhaust fan (adjacent space exhaust fan) 35 Common exhaust route 36 Internal air intake 38 Room exhaust vent 39 Room exhaust damper (exhaust port switching means) 41 Corridor exhaust vent (adjacent space exhaust vent) 42 Corridor exhaust damper (exhaust outlet switching means) 48 Corridor air supply route (adjacent space air supply route) 49 Corridor air intake (adjacent space air intake) 51 Exhaust route for corridors (exhaust route for adjacent spaces) 52 Corridor exhaust vent (adjacent space exhaust vent) 60 Pass Duct 71 Operation control means 72 Ventilation mode switching means EA Exhaust H Corridor (adjacent space) HE Corridor exhaust means (adjacent space exhaust means) HI Corridor air supply means (adjacent space air supply means) O Outdoors (outside) OA Outdoor air R1 1st living room (living room) R2 2nd living room (living room) R3 3rd living room (living room) RA Shyness RE Room exhaust means RI room air supply means SA Air Supply

Claims

1. A ventilation system installed in a building having a room and an adjacent space adjacent to the room that can be used as an evacuation room, the ventilation system including a room air supply means capable of supplying outside air to the room from the outside, A path duct connecting the living room and the adjacent space; A room exhaust means capable of exhausting indoor air from the room to the outside; adjacent space exhaust means capable of exhausting internal air from the adjacent space to the outside; an operation control means for controlling the living room exhaust means and the adjacent space exhaust means to operate in a predetermined set ventilation mode while supplying outside air to the living room by the living room air supply means; A ventilation mode switching means for switching the set ventilation mode between a normal ventilation mode and a disaster ventilation mode, the normal ventilation mode is a ventilation mode in which inside air is exhausted from the living room by the living room exhaust means, The ventilation system in the disaster ventilation mode is a ventilation mode in which the volume of inside air exhausted from the living room by the living room exhaust means is reduced compared to the normal ventilation mode, and the volume of inside air exhausted from the adjacent space by the adjacent space exhaust means is increased compared to the normal ventilation mode, thereby increasing the volume of inside air moving from the living room to the adjacent space through the path duct compared to the normal ventilation mode.

2. an adjacent space exhaust fan that is provided in an adjacent space exhaust path that connects an adjacent space exhaust port that opens into the adjacent space and the outside and is capable of blowing inside air taken in from the adjacent space exhaust port side toward the outside; 2. The ventilation system according to claim 1, wherein the operation control means stops the adjacent space exhaust fan in the normal ventilation mode and operates the adjacent space exhaust fan as the adjacent space exhaust means in the disaster ventilation mode.

3. an adjacent space supply fan provided in an adjacent space supply path connecting the outside and an adjacent space supply port opening into the adjacent space, the adjacent space supply fan being capable of blowing outside air taken in from the outside toward the adjacent space supply port; 3. The ventilation system according to claim 1, wherein the operation control means stops the adjacent space supply air fan in the normal ventilation mode and operates the adjacent space supply air fan in the disaster ventilation mode.

4. A room exhaust port opening into the room; an adjacent space exhaust port that opens into the adjacent space; a common exhaust fan that is provided in a common exhaust path that connects an inside air intake section that can ventilate the living room exhaust port and the adjacent space exhaust port with the outside, and that can blow the inside air taken in from the inside air intake section side toward the outside; an exhaust port switching means for switching an exhaust port ventilated to the inside air intake section between the living room exhaust port and the adjacent space exhaust port, 3. The ventilation system according to claim 1, wherein the operation control means operates the common exhaust fan as the living room exhaust means by ventilating the living room exhaust port to the inside air intake section of the common exhaust path using the exhaust port switching means in the normal ventilation mode, and operates the common exhaust fan as the adjacent space exhaust means by ventilating the adjacent space exhaust port to the inside air intake section of the common exhaust path using the exhaust port switching means in the disaster ventilation mode.

5. The building includes a plurality of the rooms, The ventilation system according to claim 1 or 2, wherein the ventilation mode switching means is configured to switch the set ventilation mode between the normal ventilation mode and the disaster ventilation mode individually in each of the plurality of rooms.

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