Ventilation system

Abstract

To achieve ventilation of the whole house corresponding to a state that a window of a habitable room is opened in a ventilation system.SOLUTION: The ventilating system includes a living room 11 or the like having a window 11d1 or the like, a non-living room 13 having an opening communicating with the living room 11 or the like, an air supply device 11a1 or the like for supplying air from the outside of the house 1 in each of the living room 11 or the like, an air discharge device 13a for discharging air to the outside of the house 1 in the non-living room 13, a fitting 11b or the like for opening and closing the opening 11c or the like communicating the living room 11 or the like with the non-living room 13, an airtight member for opening and closing a gap between the fitting 11c or the like and the opening 11b or the like, and an opening and closing sensor 11d1 or the like for detecting an opening and closing state of the window 11e1 or the like. On condition that it is determined that a window 11e1 or the like is opened based on a signal from an opening / closing sensor 11d1 or the like, a gap of a fitting 11d1 or the like for opening / closing an opening 11b or the like between a living room 11 or the like having the opened window 11c or the like and a non-living room 13 is closed by an airtight member.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a ventilation system. [Background technology]

[0002] A ventilation system for ventilating a building divided into multiple spaces includes a first ventilation device installed in one or more spaces and configured to supply air from outside the building and / or exhaust air to the outside of the building, a second ventilation device installed in a door or window of the building and configured to ventilate air from one side of the door or window to the other, and an interlocking control device that controls the first ventilation device and the second ventilation device in conjunction with each other. The interlocking control device controls the first ventilation device to increase the amount of air supplied from outside the building to the living rooms when the front door is opened. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-003321 [Non-patent literature]

[0004] [Non-Patent Document 1] Shihan Lee, "Calculation method for natural ventilation rate [in the case of multiple openings]", [online], April 1, 2022, Nagoya University, [Retrieved May 9, 2024], Internet<URL:https: / / lee-lab.net / blog-contents-003 / > Summary of the Invention [Problem to be solved by the invention]

[0005] A 24-hour ventilation system for a home is designed to properly ventilate each room, assuming that the windows in each room are closed. Therefore, if a window is opened in one of the rooms, the air flow within the home changes, and some rooms may not be ventilated as planned. For example, the change in air flow can increase the air pressure within the room, causing air to flow into walls or other areas in the room. Air that flows into walls or other areas can cause internal condensation. In Patent Document 1, the ventilation volume is controlled in conjunction with a sensor, but sufficient consideration is not given to the disruption of air flow caused by opening windows in the rooms.

[0006] An object of the present invention is to realize ventilation of the entire house in a ventilation system that corresponds to the state in which windows in living rooms are open. [Means for solving the problem]

[0007] (1) The ventilation system of the present invention comprises a plurality of first rooms, each having a window; a second room having an opening communicating with at least two of the plurality of first rooms; a first ventilation device for supplying or exhausting air to or from the outside of the house in each of the plurality of first rooms; a second ventilation device for supplying or exhausting air to or from the outside of the house in the second room; fittings for opening and closing the openings connecting the first room and the second room; an airtight member for opening and closing the gap between the fittings and the openings; a sensor for detecting the open / closed state of the windows; and a controller, wherein the controller, on the condition that it determines that the window is open based on a signal from the sensor, closes the gap between the fittings that open and close the opening between the first room having the open window and the second room with the airtight member.

[0008] According to the above configuration, by sealing the gaps in the fittings between the first and second rooms where the window is open with an airtight member, there is no impact on the air flow or air pressure between the first and second rooms.

[0009] (2) The controller may stop the second ventilation device on condition that it is determined based on the signal from the sensor that all of the windows in the plurality of first rooms are open.

[0010] (3) The controller may open the gaps of all the fixtures using the airtight members on the condition that it determines that all the windows of the plurality of first rooms are closed based on the signal from the sensor.

[0011] (4) The device may further include a first air volume sensor that detects a first air volume of the first ventilation device and a second air volume sensor that detects a second air volume of the second ventilation device, and the controller may control at least one of the air volumes of the first ventilation device and the second ventilation device based on a signal from the first air volume sensor and a signal from the second air volume sensor when the gap in the building fixture is closed by the airtight member.

[0012] (5) The airtight member may protrude from the underside of the fixture and open and close the gap below the fixture at the opening. [Effects of the Invention]

[0013] The ventilation system according to the present invention can achieve ventilation of the entire house in accordance with the state where the window in the first room is open. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a floor plan of a house 1 according to an embodiment of the present invention. [Figure 2] Figure 2(A) is an external oblique view of the fitting 11c with the airtight member 11f protruding, viewed from below; Figure 2(B) is an external oblique view of the fitting 11c with the airtight member 11f recessed, viewed from below; Figure 2(C) is a schematic diagram of the fitting 11c with the airtight member 11f protruding, viewed from the side; and Figure 2(D) is a schematic diagram of the fitting 11c with the airtight member 11f recessed, viewed from the side. [Figure 3]FIG. 3 is a diagram showing the configuration and control system of the controller 14. [Figure 4] Figure 4(A) is a table showing window opening and closing patterns P1 to P3 for rooms 11 and 12, Figure 4(B) is a floor plan explaining opening and closing pattern P1, Figure 4(C) is a floor plan explaining opening and closing pattern P2, and Figure 4(D) is a floor plan explaining opening and closing pattern P3. [Figure 5] Figure 5(A) is a table showing the correspondence between window opening / closing patterns P1 to P3 in rooms 11 and 12 and ventilation patterns V1 to V3, Figure 5(B) shows ventilation pattern V1 for opening / closing pattern P1, Figure 5(C) shows ventilation pattern V2 for opening / closing pattern P2, and Figure 5(D) shows ventilation pattern V3 for opening / closing pattern P3. [Figure 6] FIG. 6 shows a system flow executed by the controller 14. [Figure 7] FIG. 7 is a floor plan illustrating the problems with the ventilation system according to the prior art. [Figure 8] Figure 8(A) illustrates a room with a sufficient ventilation rate, Figure 8(B) illustrates a room with an insufficient ventilation rate and a room where the insufficiency has been resolved, Figure 8(C) illustrates the operation of the ventilation system when only the front door 13d is open, and Figure 8(D) illustrates the operation of the ventilation system when the front door 13d and window 11d3 are open. [Figure 9] FIG. 9 is a floor plan of a house 2 according to a modified example having three living rooms. [Figure 10] FIG. 10 is a diagram showing the configuration and control system of a controller 25 according to a modified example. [Figure 11] FIG. 11 shows a system flow executed by the controller 25 according to the modified example. [Figure 12] FIG. 12(A) is a floor plan of a house 3 according to a modified example, and FIG. 12(B) is a floor plan of a house 4 according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the ventilation system according to the present invention will be described in detail. Note that the embodiment described below is merely an example of the present disclosure, and it goes without saying that the embodiment can be appropriately modified without departing from the spirit and scope of the present disclosure.

[0016] [Housing composition] The house 1 according to this embodiment is a single-story 1LDK (living, dining, kitchen) house. The house 1 may have multiple floors or may be one room in an apartment building. As shown in FIG. 1, the house 1 has an interior space partitioned by exterior walls. The interior space is partitioned by a plurality of interior walls into a plurality of first rooms 11, 12 and a second room 13. The interior wall separating the first room 11 and the second room 13 has an opening 11b. The interior wall separating the first room 12 and the second room 13 has an opening 12b. In this embodiment, the first room 11 is an LDK, the first room 12 is a bedroom, and the second room 13 is an entrance hall. Hereinafter, the first room will be referred to as a "living room" and the second room will be referred to as a "non-living room."

[0017] [Room 11] Living room 11 has two first ventilation devices 11a1 and 11a2, an opening 11b, and three windows 11d1, 11d2, and 11d3. First ventilation devices 11a1 and 11a2 supply outside air into living room 11. First ventilation device 11a1 has an outside air intake port, an air supply port, a duct, a fan, and a first air flow sensor 11m1. The outside air intake port is provided on an exterior wall of house 1. The air supply port is provided, for example, on the ceiling of living room 11. One end of the duct is connected to the outside air intake port and the other end is connected to the air supply port. A fan is provided in the duct and sends air from the outside air intake port to the air supply port. First air flow sensor 11m1 is provided in the duct and detects a first air flow rate (air supply rate) and outputs a signal corresponding to the detection result to controller 14, which will be described later. The same applies to first ventilation device 11a2. The first ventilation devices 11a1 and 11a2 may share the outside air intake port, and may also share the duct and the first air volume sensor.

[0018] Opening 11b is opened in the inner wall separating living room 11 and non-living room 13. Door and window fitting 11c is fitted into opening 11b. Door and window fitting 11c opens and closes opening 11b. In this embodiment, door and window fitting 11c is a hinged door. Door and window fitting 11c has an airtight member 11f. As shown in Figures 2(A) to 2(D), airtight member 11f opens and closes the gap (hereinafter referred to as "undercut 11g") between door and floor when door and window fitting 11c is closed relative to opening 11b. Airtight member 11f closes undercut 11g, thereby making door and window fitting 11c airtight.

[0019] Three openings are provided on the exterior wall of living room 11, and sashes are attached to the openings. The sashes support windows 11d1, 11d2, and 11d3. Windows 11d1, 11d2, and 11d3 can be opened and closed. Open / close sensors 11e1, 11e2, and 11e3 are attached to windows 11d1, 11d2, and 11d3, respectively. Open / close sensors 11e1, 11e2, and 11e3 detect the open / closed states of windows 11d1, 11d2, and 11d3, respectively, and output signals according to the detection results to controller 14. When opening 11b and windows 11d1, 11d2, and 11d3 are closed and first ventilation devices 11a1 and 11a2 are caused to supply air, the air pressure inside living room 11 becomes positive, higher than the air pressure outside. When one or more of the windows 11d1, 11d2, and 11d3 are opened, the pressure inside the room 11 becomes equal to that outside.

[0020] [Room 12] The living room 12 has a first ventilation device 12a, an opening 12b, and a window 12d. The first ventilation device 12a supplies outside air into the living room 12. The first ventilation device 12a has an outside air intake port, an air supply port, a duct, a fan, and a first air flow sensor 12m. The outside air intake port is provided on the exterior wall of the house 1. The air supply port is provided, for example, on the ceiling of the living room 12. One end of the duct is connected to the outside air intake port and the other end is connected to the air supply port. The fan is provided in the duct and sends air from the outside air intake port to the air supply port. The first air flow sensor 12m is provided in the duct and detects a first air flow rate (air supply volume) and outputs a signal according to the detection result to a controller 14 described below. The opening 12b is provided in an inner wall separating the living room 12 from the non-living room 13. A fitting 12c is fitted into the opening 12b. The fitting 12c is a hinged door that opens and closes the opening 12b.

[0021] The fitting 12c has an airtight member 12f. Similar to the airtight member 11f shown in FIGS. 2(A) to 2(D), the airtight member 12f opens and closes an undercut, which is a gap between the fitting 12c and the floor when the fitting 12c is closed relative to the opening 12b. The airtight member 12f closes the undercut, thereby making the fitting 12c airtight. An opening is provided in the outer wall of the living room 11, and a sash is attached to the opening. The sash supports a window 12d. The window 12d can be opened and closed. The window 12d has an opening / closing sensor 12e. The opening / closing sensor 12e detects the open / closed state of the window 12d and outputs a signal corresponding to the detection result to the controller 14. When the opening 12b and the window 12d are closed and the first ventilation device 12a is caused to supply air, a positive pressure is created inside the living room 12. When the window 12d is open, the pressure inside the living room 12 is equal to that outside.

[0022] [Non-occupied room 13] Non-occupied room 13 has second ventilation device 13a and opening 13b. Opening 13b has front door 13d. Second ventilation device 13a has controller 14. Note that second ventilation device 13a and controller 14 may be separate entities. Second ventilation device 13a has second airflow sensor 13m. Second airflow sensor 13m detects a second airflow (exhaust volume) on the exhaust path of second ventilation device 13a and outputs a signal according to the detection result to controller 14. Front door 13d has opening / closing sensor 13e. Opening / closing sensor 13e detects the open / closed state of front door 13d and outputs a signal according to the detection result to controller 14. Note that non-occupied room 13 has a dirt floor, step, etc. as an entrance hall, but these are omitted from FIG. 1.

[0023] The second ventilation device 13a exhausts the air in the non-occupied room 13 to the outdoors. The air in the non-occupied room 13 is exhausted to the outside of the house 1, for example, through an exhaust port provided in the ceiling of the non-occupied room 13. When the openings 11b, 12b and the front door 13d are closed and the second ventilation device 13a is allowed to exhaust air, the air pressure in the non-occupied room 13 becomes negative, which is lower than the air pressure outside. When the front door 13d is opened, the air pressure inside the non-occupied room 13 becomes equal to the air pressure outside. When the occupied rooms 11, 12 are at positive or equal pressure and the non-occupied room 13 is at negative pressure, the air pressure in the non-occupied room 13 is lower than that of the occupied rooms 11, 12. The same is true when the occupied rooms 11, 12 are at positive pressure and the non-occupied room 13 is at equal pressure. When such a pressure difference occurs, air flows from the rooms 11, 12 through the undercuts of the fittings 11c, 12c to the non-occupied room 13, so that the rooms 11, 12 and the non-occupied room 13 are ventilated.

[0024] Hereinafter, the first ventilation device will be referred to as the “air supply device,” and the second ventilation device will be referred to as the “exhaust device.” Occupied rooms 11 and 12, non-occupied room 13, air supply devices 11a1, 11a2, and 12a, exhaust device 13a, fittings 11c and 12c, airtight members 11f and 12f, opening / closing sensors 11e1, 11e2, 11e3, and 12e, and controller 14 constitute a ventilation system.

[0025] [Airtight members 11f, 12f] The fitting 11c of the living room 11 has an airtight member 11f. The airtight member 11f is a so-called seal frame. The fitting 11c has an undercut 11g between the fitting 11c and the floor 11i. The airtight member 11f protrudes and retracts from the underside 11h of the fitting 11c by controlling an actuator such as an electromagnetic valve by the controller 14. As shown in FIG. 2(A), when the airtight member 11f protrudes from the underside 11h of the fitting 11c, the undercut 11g of the fitting 11c is closed. As shown in FIG. 2(B), when the airtight member 11f is retracted into the underside 11h of the fitting 11c, the undercut 11g of the fitting 11c is opened.

[0026] Therefore, as shown in FIG. 2(C), the height dimension D1 of the airtight member 11f is greater than the height dimension D2 of the undercut 11g of the fitting 11c. As shown in FIG. 2(D), the airtight member 11f moves in and out in the height direction by a distance equal to or greater than the height D2. In this way, the undercut 11g can be opened or closed over the entire height direction. The drive mechanism of the airtight member 11f may be operated, for example, by wireless power supply or by wired power supply. Furthermore, for the convenience of entering and exiting the living room 11, the airtight member 11f may be biased in advance so that the undercut 11g is opened when power supply is stopped. The same applies to the airtight member 12f of the fitting 12c of the living room 12.

[0027] [Controller 14] 3, the controller 14 includes a central processing unit (CPU) 14a, a memory 14b, and an application specific integrated circuit (ASIC) 14c. The memory 14b includes a nonvolatile memory 14d and a volatile memory 14e. The nonvolatile memory 14d is, for example, a mask read only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (EPROM), an electrically erasable programmable read only memory (EEPROM), a flash memory, a hard disk drive (HDD), or a solid state drive (SSD). The volatile memory 14e is, for example, a random access memory (DRAM), a static random access memory (SRAM), or the like. The ASIC 14c is an interface device that enables the CPU 14a to access the air supply devices 11a1, 11a2, 12a, the exhaust device 13a, the airtight members 11f, 12f, the opening / closing sensors 11e1, 11e2, 11e3, 12e, 13e, the first air flow sensors 11m1, 11m2, 12m, and the second air flow sensor 13m.

[0028] CPU 14a reads programs, parameters, etc. from nonvolatile memory 14d and executes processing using volatile memory 14e as a working storage area. As a result, for occupied room 11, controller 14 controls air supply devices 11a1 and 11a2 and airtight member 11f and monitors the output signals of opening / closing sensors 11e1, 11e2, and 11e3 and first air flow sensors 11m1 and 11m2. For occupied room 12, controller 14 controls air supply device 12a and airtight member 12f and monitors the output signals of opening / closing sensor 12e and first air flow sensor 12m. For non-occupied room 13, controller 14 controls exhaust device 13a and monitors the output signals of opening / closing sensor 13e and second air flow sensor 13m. The output signals of the open / close sensors 11e1, 11e2, 11e3, 12e, and 13e are two-state signals that indicate whether the windows 11d1, 11d2, 11d3, and 12d and the front door 13d are in the "open" state or the "closed" state. The output signals of the first air flow sensors 11m1, 11m2, and 12m and the second air flow sensor 13m are multi-stage signals that indicate the air flow rate.

[0029] Controller 14 references the output signals of first air flow sensors 11m1, 11m2, 12m and second air flow sensor 13m and performs feedback control of air supply devices 11a1, 11a2, 12a and exhaust device 13a so that the first air flow rate becomes the desired supply air flow rate and the second air flow rate becomes the desired exhaust air flow rate. That is, if the first air flow rate is less than the desired supply air flow rate, the rotation speed of the air supply device fan is increased so that the first air flow rate increases, and conversely, if the first air flow rate is greater than the desired supply air flow rate, the rotation speed of the air supply device fan is decreased so that the first air flow rate decreases. The same applies to the exhaust air flow rate.

[0030] Non-volatile memory 14d stores default values ​​for the supply air volumes of air supply devices 11a1, 11a2, and 12a (hereinafter referred to as "default supply air volumes") and default values ​​for the exhaust air volume of exhaust device 13a (hereinafter referred to as "default exhaust volume"). The sum of the default supply air volumes is equal to the default exhaust volume. Feedback control using the default supply air volume and default exhaust volume as the desired supply air volume and desired exhaust volume is referred to as "normal ventilation." Furthermore, a state in which the difference between the total supply air volume and the exhaust volume is within an acceptable range is referred to as a balanced state of ventilation (supply and exhaust). If the difference between the total supply air volume and the exhaust volume becomes large, the air pressure inside the room increases, causing indoor air to flow into the wall, resulting in internal condensation. In this embodiment, the range within which the inflow of indoor air into the wall can be suppressed is referred to as the acceptable range of the difference between the total supply air volume and the exhaust volume.

[0031] [Window opening and closing patterns P1~P3] The ventilation state of house 1 during window-open ventilation is affected by the opening and closing patterns of windows 11d1, 11d2, 11d3, and 12d in living rooms 11 and 12. In this embodiment, living room 11 is provided with three windows 11d1, 11d2, and 11d3, and living room 12 is provided with one window 12d. However, regardless of the number of windows in each room, controller 14 refers to the output signals of opening and closing sensors 11e1, 11e2, 11e3, and 12e, and determines that the windows in that room are open if at least one window in that room is open.

[0032] As shown in Figure 4(A), there are three opening and closing patterns for the windows of rooms 11 and 12. Controller 14 refers to the output signals of opening and closing sensors 11e1, 11e2, 11e3, and 12e of rooms 11 and 12, and if all are in the "closed" state, controller 14 determines that opening and closing pattern P1 (fully closed) in which the windows of rooms 11 and 12 are closed is the pattern shown in Figure 4(B). If one or more of the output signals of opening and closing sensors 11e1, 11e2, and 11e3 of room 11 are in the "open" state and the output signal of opening and closing sensor 12e of room 12 is in the "open" state, controller 14 determines that opening and closing pattern P2 (fully open) in which the windows of both rooms 11 and 12 are open is the pattern shown in Figure 4(C).

[0033] When one or more of the output signals of opening / closing sensors 11e1, 11e2, and 11e3 in living room 11 are in the "open" state and the output signal of opening / closing sensor 12e in living room 12 is in the "closed" state, or when all of the output signals of opening / closing sensors 11e1, 11e2, and 11e3 in living room 11 are in the "closed" state and the output signal of opening / closing sensor 12e in living room 12 is in the "open" state, controller 14 determines that opening / closing pattern P3 (partially open) is in effect, in which some of the windows in living rooms 11 and 12 are open, as illustrated in FIG. 4(D). Note that in this embodiment, to avoid redundancy and simplify the explanation, opening / closing pattern P3 (partially open) will be used as an example in which the window in living room 11 is open and the window in living room 12 is closed. From this example, the pattern in which the window in living room 12 is open and the window in living room 11 is closed can also be easily understood.

[0034] [Window opening and closing patterns P1 to P3 and ventilation patterns V1 to V3] In this embodiment, the controller 14 switches between ventilation patterns V1 to V3 according to the window opening / closing patterns P1 to P3. As shown in Fig. 5(A), the ventilation patterns V1 to V3 correspond to the window opening / closing patterns P1 to P3, respectively.

[0035] [Ventilation pattern V1] Ventilation pattern V1 corresponds to opening / closing pattern P1 (fully closed). In ventilation pattern V1, controller 14 controls air supply devices 11a1 and 11a2 of occupant room 11 and air supply device 12a of occupant room 12 to supply air, and controls air exhaust device 13a of non-occupant room 13 to exhaust air, as shown in Figure 5(B). As a result, occupant rooms 11 and 12 are under positive pressure relative to the outside air pressure, and non-occupant room 13 is under negative pressure.

[0036] Controller 14 also controls airtight member 11f in living room 11 to release the airtightness of fitting 11c, and controls airtight member 12f in living room 12 to release the airtightness of fitting 12c. This allows air to ventilate from living rooms 11 and 12, which are under positive pressure, to non-living room 13, which is under negative pressure. Controller 14 controls the difference between the amount of air supplied by air supply devices 11a1, 11a2, and 12a and the amount of air exhausted by exhaust device 13a so that it falls within a predetermined range. This maintains a balanced ventilation throughout house 1.

[0037] [Ventilation pattern V2] Ventilation pattern V2 corresponds to opening / closing pattern P2 (fully open). In ventilation pattern V2, the controller 14 stops the air supply devices 11a1 and 11a2 in the occupant room 11, the air supply device 12a in the occupant room 12, and the exhaust device 13a in the non-occupant room 13, as shown in FIG. 5(C). This ensures that the occupant rooms 11, 12, and the non-occupant room 13 are all at equal pressure to the outside air pressure. This maintains a balanced ventilation system. Furthermore, since extreme positive or negative pressures are avoided, indoor air is prevented from reaching unexpected locations, such as inside walls. Furthermore, the opening 11b between the occupant room 11 and the non-occupant room 13 is ventilated because the undercut 11g of the fitting 11c is open. The opening 12b between the occupant room 12 and the non-occupant room 13 is also ventilated because the undercut (not shown) of the fitting 12c is open. This allows ventilation within the house 1 by opening the windows.

[0038] [Ventilation pattern V3] Ventilation pattern V2 corresponds to opening / closing pattern P3 (partially open). In ventilation pattern V3, controller 14 stops air supply devices 11a1 and 11a2 in occupant room 11 and activates air supply device 12a in occupant room 12 and exhaust device 13a in non-occupant room 13. Controller 14 also airtightens fitting 11c with airtight member 11f and releases airtightness from fitting 12c with airtight member 12f. As shown in FIG. 5(D), occupant room 11 is ventilated by opening the window, and the pressure is equalized with the outside air. Because airtightness is maintained between occupant room 11 and non-occupant room 13, occupant room 12 and non-occupant room 13 are not affected by the window opening in occupant room 11. As a result, occupant room 12 is at a positive pressure due to the air supply, and non-occupant room 13 is at a negative pressure due to the exhaust. Since the airtight seal between the occupant room 12 and the non-occupant room 13 is broken, ventilation is possible from the occupant room 12, which is under positive pressure, to the non-occupant room 13, which is under negative pressure. The controller 14 controls the amount of air supplied by the air supply device 12a of the occupant room 12 to be equal to the amount of air exhausted by the exhaust device 13a of the non-occupant room 13. This maintains a balanced ventilation.

[0039] [System Flow] The system flow executed by controller 14 to ventilate using the above ventilation patterns V1 to V3 will now be described. As shown in Fig. 6, when controller 14 detects that a room window has moved due to a change in the output signals of opening / closing sensors 11e1, 11e2, 11e3, 12e, and 13e (S1), controller 14 checks the open / closed status of windows 11d1, 11d2, 11d3, and 12d in rooms 11 and 12 by referring to the output signals of opening / closing sensors 11e1, 11e2, 11e3, 12e, and 13e (S2). For example, when the output signals of the open / close sensors 11e1, 11e2, 11e3, 12e, and 13e change, the ASIC 14c inputs an interrupt signal to the CPU 14a, and the CPU 14a accesses the ASIC 14c as interrupt processing corresponding to the interrupt signal, and refers to the detection results of the open / close sensors 11e1, 11e2, 11e3, 12e, and 13e to check the open / closed status of the windows 11d1, 11d2, 11d3, and 12d in the rooms 11 and 12.

[0040] If the result of the check is that both the windows of rooms 11 and 12 are fully closed (opening / closing pattern P1) (S3), the airtightness of the fittings 11c of room 11 and the fittings 12c of room 12 are released, and air is supplied to the air supply devices 11a1, 11a2, and 12a and exhausted to the exhaust device 13a, thereby returning to normal ventilation. return If one or more of windows 11d1, 11d2, and 11d3 in room 11 and window 12d in room 12 are fully open (opening / closing pattern P2) (S4), controller 14 releases the airtightness of fitting 11c in room 11 and fitting 12c in room 12, and stops all air supply devices 11a1, 11a2, 11a3, and 12a and exhaust device 13a (S8).

[0041] If the room is partially open (opening / closing pattern P3) with only the window of room 11 open (S5), controller 14 airtightens fitting 11c of room 11, releases the airtightness of fitting 12c of room 12, stops air supply devices 11a1 and 11a2, causes air supply device 12a to supply air, and causes exhaust device 13a to exhaust air (S9). Similarly, if the room is partially open (opening / closing pattern P3) with only the window of room 12 open (S6), controller 14 releases the airtightness of fitting 11c of room 11, releases the airtightness of fitting 12c of room 12, causes air supply devices 11a1 and 11a2 to supply air, stops air supply device 12a, and causes exhaust device 13a to exhaust air (S10).

[0042] In this way, on the condition that controller 14 determines that windows 11d1, 11d2, 11d3, 12d are open based on output signals from opening / closing sensors 11e1, 11e2, 11e3, 12e, 13e, controller 14 closes, with airtight members 11f, 12f, undercuts (lower gaps) 11g of fittings 11c, 12c that open and close openings 11b, 12b between habitable rooms (first rooms) 11, 12 having open windows 11d1, 11d2, 11d3, 12d and non-habitable room (second room) 13. Note that, for the sake of balancing ventilation, the total amount of air supplied by air supply devices 11a1, 11a2 may be adjusted, or only one of air supply devices 11a1, 11a2 may be operated and the other may be stopped.

[0043] After processing steps S9 and S10, controller 14 references the output signals of first air flow sensors 11m1, 11m2, and 12m to obtain the supply air volume, references the output signal of second air flow sensor 13m to obtain the exhaust volume, and compares the supply air volume with the exhaust volume (S11). If the supply air volume is less than the exhaust volume (S13), air supply devices 11a1, 11a2, and 12a are controlled to increase the supply air volume (S15). Conversely, if the supply air volume is greater than the exhaust volume (S14), air supply devices 11a1, 11a2, and 12a are controlled to decrease the supply air volume (S16). The reason for adjusting only the supply air volume is to stabilize the ventilation rate of house 1 based on the exhaust volume.

[0044] In this way, the controller 14 controls at least one of the first airflow rate (intake air rate) of the air supply device (first ventilation device) 11a1, 11a2, 12a and the second airflow rate (exhaust air rate) of the exhaust device (second ventilation device) 13a based on the signals from the first airflow sensors 11m1, 11m2, 12m and the signal from the second airflow sensor 13m when the undercut (lower gap) of the fitting 11c or fitting 12c is closed by the airtight members 11f, 12f. Therefore, the exhaust air rate may be adjusted based on the intake air rate. After the processing of steps S14 and S16, the processing of step S11 is executed again. If the intake air rate and the exhaust air rate are equal (S12), the processing ends. The processing also ends after the processing of steps S7 and S8. After this, when the controller 14 detects that the living room window has moved due to a change in the output signals of the open / close sensors 11e1, 11e2, 11e3, 12e, and 13e (S1), it executes the processes from step S2 onwards in the same manner as above.

[0045] [Effects of the embodiment] 24-hour ventilation systems in homes are designed to ensure proper ventilation in each occupant's room, assuming that all windows are closed. Therefore, conventional ventilation systems result in some rooms not being ventilated properly when some windows are open. In the example shown in Figure 1, occupied rooms 11 and 12 are at positive pressure relative to the outside air due to the intake air, while non-occupant room 13 is at negative pressure relative to the outside air due to the exhaust air. In contrast, as shown in Figure 7, when window 11d3 in occupied room 11 is opened, the pressure inside occupied room 11 becomes equal to the outside air, and non-occupant room 13, which is connected to occupied room 11 via opening 11b, also becomes equal to the outside air pressure.

[0046] In this way, as the air pressure in non-occupied room 13 rises and the pressure difference between occupied room 12 and non-occupied room 13 decreases, the amount of air vented from occupied room 12 to non-occupied room 13 decreases. If the amount of air supplied to occupied room 12 is kept constant in this state, the air pressure in occupied room 12 will rise until the amount of air vented from occupied room 12 to non-occupied room 13 becomes equal to the amount of air supplied to occupied room 12. Conventional technology includes ventilation volume control and sensor linkage, but does not fully consider the impact of opening windows for ventilation, which can cause ventilation imbalances, i.e., the air pressure and air flow in each room not being as designed. This can result in indoor air going to unexpected places, such as inside walls, and condensation can occur inside the walls.

[0047] On the other hand, if the interior door between the occupant room with the window open and the non-occupant room is airtight as in the above embodiment, the air pressure in the non-occupant room 13 will not rise even if the window 11d3 in the occupant room 11 is opened, as in the above example. In this state, if the ventilation between the occupant room 12 and the non-occupant room 13 is balanced, the increase in air pressure in the occupant room 12 can be suppressed. This suppresses the inflow of indoor air into the wall, which helps prevent internal condensation. Furthermore, by ventilating only the occupant room and the non-occupant room with the window closed, the ventilation air volume can be kept to a minimum, thereby reducing the power consumption of the ventilation equipment. In this way, optimal and efficient ventilation can be achieved according to the conditions of the occupant room.

[0048] [Variations] (1) In the above embodiment, an example was described in which ventilation pattern V3 (partially open) was used to stop air supply devices 11a1 and 11a2 in room 11 with an open window. Specifically, in step S9 of FIG. 6, air supply devices 11a1 and 11a2 in room 11 with an open window are stopped, and in step S10, air supply device 12a in room 12 with an open window is stopped. However, when performing window-open ventilation, the window-open ventilation volume is not necessarily constant, so there is a risk of an insufficient ventilation rate. For this reason, a ventilation device is used to compensate for the insufficient ventilation rate.

[0049] To compensate for the lack of ventilation, first determine the window opening ventilation volume. Window opening ventilation volume per second Q1 [m 3 / sec] can be calculated, for example, using the following formula (1) (see Non-Patent Document 1). Q1 = αA(2ΔP / ρ) 1 / 2 ···(1) where α is the flow coefficient. A[m 2 ] is the opening area (window opening area). Therefore, the multiplication of these gives αA, which is the effective opening area. ρ [kg / m 3 ] is the fluid density, which is approximately 1.2 [kg / m 3 ]. ΔP is the pressure difference between indoors and outdoors. For ventilation due to a temperature difference ΔT [K] between indoors and outdoors, ΔP can be calculated from ΔT.

[0050] In this modification, environmental sensors 11j, 12j, 13j, and 15 are installed in the house 1. The environmental sensors 11j, 12j, and 13j detect the indoor temperatures in the occupied rooms 11 and 12 and the non-occupied room 13, respectively. The environmental sensor 15 detects the outdoor temperature. The controller 14 acquires the temperatures detected by the environmental sensors 11j, 12j, 13j, and 15 and calculates the indoor-outdoor temperature difference ΔT. Furthermore, exhaust devices 11k and 12k are installed in the occupied rooms 11 and 12 to compensate for any shortage of ventilation. In this modification, the exhaust devices 11k and 12k are fans. It is also possible to use an air supply / exhaust device that switches between air supply and exhaust as the first ventilation devices 11a1, 11a2, and 12a, instead of an air supply device that only supplies air, without installing the exhaust devices 11k and 12k.

[0051] [Determining whether the ventilation frequency by opening windows is sufficient or insufficient] Whether the ventilation rate through window ventilation is sufficient or insufficient can be determined by the window ventilation rate Q2 per hour. Since the window ventilation rate Q1 in the above formula (1) is the ventilation rate in seconds, multiplying it by 3,600 can convert it to the window ventilation rate Q2 per hour. The ventilation rate per hour based on the ventilation rate Q can be written as (Q / C) using the volume C of the space to be ventilated. If the ventilation rate (Q / C) is less than the specified rate, it is considered insufficient ventilation, and if it is greater than the specified rate, it is considered sufficient.

[0052] [If non-occupied room 13 is not included in the target for window ventilation] In this embodiment, airtightness is maintained between the living room with the window open and the non-living room. When the non-living room 13 is not included in the window opening ventilation targets in the house 1, the ventilation rate is calculated based on the volume C1 of the living room that is the window opening ventilation target. Q2 / C1 ≧ 0.5 If so, the controller 14 determines that the ventilation rate is sufficient and does not exhaust air by the fan (FIG. 8(A)). Q2 / C1 < 0.5 If so, the controller 14 determines that the ventilation rate is insufficient and starts the fan to exhaust air (FIG. 8(B)). Note that the room in FIGS. 8(A) and 8(B) may be either room 11 or 12.

[0053] In this way, the amount of air supplied through the open window increases, thereby resolving the lack of ventilation. The above processing may be executed after the processing of steps S8 and S12 in the system flow of Figure 6. Furthermore, since the amount of ventilation through opening the window is not necessarily constant and can change over time, it is even more preferable if the controller 14 continuously monitors the amount of ventilation through opening the window separately from the system flow of Figure 6 and adjusts the amount of exhaust air by the fan. Furthermore, since the pressure in a room with an open window is equal to that of the outside, the above-mentioned internal condensation does not occur regardless of the amount of ventilation.

[0054] [If non-occupied room 13 is included in the ventilation target by opening a window] If the targets for window ventilation in the house 1 include non-occupied rooms 13, the volume C1 of the occupied rooms targeted for window ventilation and the volume C2 of the non-occupied rooms 13 are added together to calculate the ventilation rate, thereby determining whether the window ventilation volume Q2 per hour is insufficient. Q2 / (C1+C2) ≧ 0.5 If so, the window is judged to be sufficient for ventilation. On the other hand, if the ventilation rate is Q2 / (C1+C2) < 0.5 If so, it is determined that there is insufficient ventilation, and processing is carried out to compensate for the lack of ventilation volume.

[0055] 8(C), in house 1, when front door 13d is open, windows 11d1, 11d2, 11d3, and 12d are all closed, and fittings 11c and 12c are not airtight (opening / closing pattern P1 (fully closed)), controller 14 adds up the volumes of occupant rooms 11 and 12 and non-occupant room 13, and divides the hourly window opening ventilation amount Q2 by this sum to calculate the ventilation rate. If the calculated ventilation rate is less than 0.5, controller 14 determines that ventilation is insufficient and activates air supply / exhaust devices 11a1, 11a2, and 12a in occupant rooms 11 and 12 to exhaust air. As a result, the pressure inside rooms 11 and 12 becomes negative, while in non-occupied room 13, because front door 13d is open, the pressure becomes equal to that outside house 1. Air is drawn from non-occupied room 13 into rooms 11 and 12 through the undercuts of fittings 11c and 12c and is then exhausted outside house 1. In this way, the specified ventilation rate (0.5 times per hour) is ensured.

[0056] Furthermore, as shown in FIG. 8(D), when the front door 13d is open, the window 11d3 of the living room 11 is open, and the window 12d of the living room 12 is closed, the controller 14 determines that the situation corresponds to the opening / closing pattern P3 (partially open) and airtightly seals the opening 11b with the airtight member 11f. As a result, the ventilation rates are evaluated separately for the space containing only the living room 11 and the space containing the living room 12 and the non-living room 13 (the shaded area in FIG. 8(D)). The ventilation rate for the space containing only the living room 11 is the same as that described above for the case in which the non-living room 13 is not included in the window-opening ventilation targets. For the space containing the living room 12 and the non-living room 13, the controller 14 calculates the ventilation rate resulting from opening the front door 13d (this ventilation rate is also referred to as the "window-opening ventilation rate") using the above formula (1), and divides the obtained window-opening ventilation rate by the volume of the space containing the living room 12 and the non-living room 13 to determine the ventilation rate.

[0057] If the calculated ventilation rate is 0.5 or more times per hour, the ventilation rate is determined to be sufficient. If the ventilation rate is less than 0.5 times, the ventilation rate is determined to be insufficient, and the air supply and exhaust device 12a in the living room 12 is activated to compensate for the ventilation rate. In this way, the ventilation rate is ensured for the space consisting of the living room 12 and the non-living room 13. Note that the target ventilation rate may be other than 0.5 times, and in that case, the ventilation rate can be ensured in the same manner as above.

[0058] (2) In the above embodiment, the house 1 has been described as having two living rooms 11 and 12, but it goes without saying that the present invention is not limited to this, and the number of living rooms may be three or more. Furthermore, a non-living room may also serve as a staircase, and there may be one or more living rooms on the second floor or higher. However, the second non-living room has an opening that communicates with two or more of the first living rooms. In the living rooms on the second floor or higher, an opening is provided between the living room and the staircase.

[0059] 9 has three living rooms 21, 22, and 24 and a non-living room 23. Living room 21 has air supply devices 21a1 and 21a2, an opening 21b to non-living room 23, a fixture 21c fitted into opening 21b, windows 21d1, 21d2, and 21d3, and opening / closing sensors 21e1, 21e2, and 21e3 that detect the opening and closing of windows 21d1, 21d2, and 21d3. Living room 22 has air supply device 22a, an opening 22b to non-living room 23, a fixture 22c fitted into opening 22b, a window 22d, and an opening / closing sensor 22e that detects the opening and closing of window 22d.

[0060] The occupant room 24 has an air supply device 21a, an opening 24b to the non-occupant room 23, a fitting 24c fitted into the opening 24b, a window 24d, and an opening / closing sensor 24e that detects the opening and closing of the window 24d. The non-occupant room 23 has an exhaust device 23a, an opening 23b, an entrance door 23d fitted into the opening 23b, and an opening / closing sensor 23e that detects the opening and closing of the entrance door 23d. A controller 25 is built into the exhaust device 23a. The fittings 21c, 22c, and 24c have airtight members 21f, 22f, and 24f, respectively, similar to the fittings 11c and 12c according to the above embodiment. The airtight members open and close the undercuts of the fittings 21c, 22c, and 24c to establish or break the airtightness.

[0061] 10, controller 25 has a CPU 25a, memory 25b, and ASIC 25c, similar to controller 14. Memory 25b has nonvolatile memory 25d and volatile memory 25e. Nonvolatile memory 25d is a mask ROM or the like, and volatile memory 25e is a DRAM or the like. ASIC 25c is an interface device that allows CPU 25a to access air supply devices 21a1, 21a2, 22a, 24a, exhaust device 23a, airtight members 21f, 22f, 24f, open / close sensors 21e1, 21e2, 21e3, 22e, 23e, 24e, and first air volume sensors 21m1, 21m2, 22m, 23m, 24m.

[0062] Controller 25 monitors and controls each part of house 2 in accordance with the system flow shown in Fig. 11. That is, when controller 25 detects that a living room window has moved due to a change in the output signals of opening / closing sensors 21e1, 21e2, 21e3, 22e, 23e, and 24e (S21), controller 25 checks the open / closed status of windows 21d1, 21d2, 21d3, 22d, and 24d in living rooms 21, 22, and 24 by referring to the output signals of opening / closing sensors 21e1, 21e2, 21e3, 22e, 23e, and 24e (S22).

[0063] If the confirmation result shows that all windows in rooms 21, 22, and 24 are "fully closed" (S23), air supply devices 21a1, 21a2, 22a, and 24a and exhaust device 23a are returned to normal ventilation (S27). At this time, controller 25 opens the undercuts (lower gaps) of all fittings 21c, 22c, and 24c using airtight members 21f, 22f, and 24f. If the windows in rooms 21, 22, and 24 are "fully open" (S24), air supply devices 21a1, 21a2, 21a3, 22a, and 24a and exhaust device 23a are all stopped (S28).

[0064] If only some of the windows in rooms 21, 22, and 24 are "partially open" (S25), airtight members 21f, 22f, and 24f of the rooms with open windows are protruded from the underside of the fixture to close the undercut and make the fixture "airtight." The air supply devices of the rooms with closed windows are activated to supply air from the rooms, and exhaust device 23a of non-occupied room 23 is activated to exhaust air from non-occupied room 23 (S29). To balance the ventilation, the air supply volume of each air supply device of the rooms with closed windows is adjusted. When windows 21d1, 21d2, and 21d3 of room 21 are all closed, the air supply volumes of both air supply devices 21a1 and 21a2 may be adjusted, or one may be activated and the other may be stopped.

[0065] After processing step S29, it is checked whether the supply air volume and the exhaust air volume are balanced (S31), and if the supply air volume is less than the exhaust air volume (S33), the supply air volume is increased (S35). The supply air volume may be increased by the difference with the exhaust air volume, or by a predetermined increment. Conversely, if the supply air volume is greater than the exhaust air volume (S34), the supply air volume is decreased (S36). In this case, too, the supply air volume may be decreased by the difference with the exhaust air volume, or by a predetermined increment. The reason for adjusting only the supply air volume is to stabilize the ventilation rate of house 1 based on the exhaust air volume.

[0066] After steps S34 and S36, controller 25 executes step S31 again. If the supply air volume and exhaust air volume are equal (S32), the process ends. The process also ends after steps S27 and S28. After this, if controller 25 detects that the living room window has moved due to a change in the output signal of opening / closing sensors 21e1, 21e2, 21e3, 22e, 23e, and 24e (S21), it executes step S22 and subsequent processes in the same manner as above.

[0067] The system flow in FIG. 11 can also be applied when the house has four or more living rooms. Even if there are four or more living rooms, applying the above system flow can balance the ventilation volume. Therefore, similar to the above embodiment, effects such as preventing internal condensation can be obtained. Note that this modified example may also be combined with the above modified example (1) to compensate for the lack of ventilation frequency in living rooms with open windows.

[0068] (3) In the above embodiment, the case where only the supply air volume is adjusted in steps S15 and S16 of FIG. 6 was described as an example, and in the above modified example, the case where only the supply air volume is adjusted in steps S35 and S36 of FIG. 11 was described as an example. However, it goes without saying that the present invention is not limited to this, and the following may be added. That is, when the window opening / closing pattern is "partially open," the exhaust air volume Ve in the occupant room where the window is open may be reduced by the amount of the supply air volume Vs before the window was opened. By adjusting the supply air volume in steps S15, S16, S35, and S36 based on the reduced exhaust air volume (Ve - Vs), it is possible to match the ventilation rates between the occupant room where the window is closed and the non-occupant room before and after the window is opened. This allows for reduced power consumption by the exhaust device in the non-occupant room while maintaining good ventilation conditions.

[0069] (4) In the above embodiment, the first ventilation device supplies air from outside the house. However, the present invention is not limited to this. The first ventilation device may supply air or exhaust air from the outside of the house. The supply and exhaust functions may differ depending on the room. In addition to the above embodiment, in a room where multiple first ventilation devices are installed, all the first ventilation devices may exhaust air, or both an air supply device and an exhaust device may be used.

[0070] (5) In the above embodiment, an example was described in which all habitable rooms have openings to non-habitable rooms. However, the present invention is not limited to this. As shown in FIG. 12(A), there may be a habitable room 34 that has no opening to a non-habitable room 33 and only has an opening 34b to another habitable room 31. When such a habitable room 34 is present, an airtight member is not provided on the fitting 34c of the opening 34b, and the opening 34b is not airtight, so that the undercut of the fitting 34c of the opening 34b is always ventilated. In this way, the controller 35 monitors and controls the habitable room 31 and the habitable room 34 as a single room, thereby achieving the same effects as the above embodiment.

[0071] 12(B), a living room 44 may have an opening 44b1 to a non-living room 43 and an opening 44b2 to another living room 41. Even in a living room 44 like this, the door 44c2 at the opening 44b2 is not provided with an airtight member, and the opening 44b2 is not airtight, allowing the undercut of the door 44c2 to remain ventilated. In this manner, the controller 45 monitors and controls the living room 41 and the living room 44 as a single room, thereby achieving the same effect as the above-described embodiment. In this modification, the controller 45 simultaneously seals or releases the airtightness of the opening 41b between the living room 41 and the non-living room 43 and the opening 44b1 between the living room 44 and the non-living room 43.

[0072] (6) In the above embodiment, the fittings are hinged doors, but the fittings may be sliding doors. Furthermore, fittings other than hinged doors and sliding doors may be used as long as they can be switched between airtight and non-airtight.

[0073] [Appendix 1] a plurality of first chambers each having a window; a second chamber having an opening communicating with at least two of the first chambers; a first ventilation device that supplies or exhausts air between the plurality of first rooms and the outside of the house in each of the first rooms; A second ventilation device that supplies air or exhausts air between the second room and the outside of the house, a fitting that opens and closes an opening that connects the first chamber and the second chamber; an airtight member that opens and closes the gap between the fitting and the opening; a sensor for detecting the open / closed state of the window; a controller; The ventilation system is configured such that, on condition that the controller determines that the window is open based on a signal from the sensor, the controller closes the gap in the fixture that opens and closes the opening between the first room and the second room having the open window with the airtight member.

[0074] [Appendix 2] The ventilation system of claim 1, wherein the controller stops the second ventilation device on the condition that it determines, based on the signal from the sensor, that all of the windows in the plurality of first rooms are open.

[0075] [Appendix 3] The ventilation system of claim 1, wherein the controller opens the gaps in all the fixtures using the airtight members on the condition that it determines based on the signal from the sensor that all the windows in the first rooms are closed.

[0076] [Appendix 4] a first air volume sensor that detects a first air volume of the first ventilation device; Further provided is a second air volume sensor that detects a second air volume of the second ventilation device, The above controller is The ventilation system of claim 1, wherein at least one of the air volume of the first ventilation device and the air volume of the second ventilation device is controlled based on a signal from the first air volume sensor and a signal from the second air volume sensor when the gap between the building materials is closed by the airtight member.

[0077] [Appendix 5] 2. The ventilation system according to claim 1, wherein the airtight member appears and disappears from the underside of the fixture, and opens and closes the gap below the fixture at the opening. [Explanation of symbols]

[0078] 1, 2, 3, 4... Housing 11, 12, 21, 22, 24...Room 1 (living room) 11a1, 11a2, 12a... First ventilation device (air supply device) 11b, 12b, 13b, 21b, 22b, 23b, 24b...Aperture 11th century, 12th century, 21st century, 22nd century, 24th century... Building materials 11d1, 11d2, 11d3, 12d...window 11e1, 11e2, 11e3, 12e, 13e... Open / close sensor 11f, 12f, 21f, 22f, 24f... Airtight members 11g...Undercut 11h: Underside of door and window 11c 11i...floor 11j, 12j, 13j, 15... Environmental sensors 11k, 12k, 13a, 23a... Second ventilation system (exhaust system) 11m1, 11m2, 12m...1st air flow sensor 13, 23...Room 2 (non-occupied) 13d, 23d... Entrance door 13m Second air flow sensor 14, 25 Controller 14a CPU 14b...Memory 14c···ASIC 21a1, 21a2, 22a, 24a... First ventilation device (air supply device) 21d1, 21d2, 21d3, 22d, 24d... Windows 21e1, 21e2, 21e3, 22e, 23e, 24e... Open / close sensors

Claims

1. a plurality of first chambers each having a window; a second chamber having an opening communicating with at least two of the first chambers; a first ventilation device that supplies air to or exhausts air from the outside of the house in each of the plurality of first rooms; a second ventilation device that supplies air to or exhausts air from the second room to the outside of the house; a fitting that opens and closes an opening that connects the first chamber and the second chamber; an airtight member that opens and closes the gap between the fitting and the opening; a sensor for detecting the open / closed state of the window; a controller; The ventilation system is configured such that, on condition that the controller determines that the window is open based on a signal from the sensor, the controller closes the gap in the fixture that opens and closes the opening between the first room having the open window and the second room with the airtight member.

2. The ventilation system according to claim 1, wherein the controller stops the second ventilation device on the condition that it determines based on the signal from the sensor that all of the windows in the first rooms are open.

3. The ventilation system described in claim 1, wherein the controller opens the gaps in all building materials using the airtight member on the condition that it determines based on the signal from the sensor that all of the windows in the plurality of first rooms are closed.

4. a first air volume sensor that detects a first air volume of the first ventilation device; a second air volume sensor that detects a second air volume of the second ventilation device, The above controller is The ventilation system described in claim 1, wherein at least one of the air volume of the first ventilation device and the air volume of the second ventilation device is controlled based on a signal from the first air volume sensor and a signal from the second air volume sensor when the gap between the building materials is closed by the airtight member.

5. 2. The ventilation system according to claim 1, wherein the airtight member protrudes from and retracts from the underside of the fixture to open and close the gap below the fixture at the opening.

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