Ventilation system, control device and ventilation method

Abstract

To stably operate a ventilation system in a building that can change an air supply volume or discharge volume in a room.SOLUTION: A ventilation system comprises: a plurality of blowers that supply air from a non-residential space to a plurality of rooms; and a control unit that performs, when performing a change process of changing an air volume of some of the blowers among the plurality of blowers, an adjustment process that adjusts at least one of air supply to the non-residential space and the air volume of the blower corresponding to the room other than the blower that changes the air volume so that a total air volume of the plurality of blowers is equal to the air supply volume to the non-residential space.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a ventilation system, a control device, and a ventilation method. [Background technology]

[0002] In recent years, as homes have become more airtight, it has become known that indoor contamination by chemical substances used in building materials, as well as mold and mites that develop in hot and humid environments, increases the likelihood of health damage known as sick building syndrome.

[0003] As a result, the Building Standards Act was revised to require homes to be equipped with ventilation systems that automatically ventilate indoor air.

[0004] For example, Patent Document 1 (Japanese Patent Laid-Open Publication No. 2000-55426) discloses an air pressure difference adjustment device that can reduce the air pressure difference between the inside and outside of a building by circulating air between the inside and outside of the building. That is, the air pressure difference adjustment device is provided in a building that is configured to have an entrance opening that communicates the inside and outside of the building, an entrance door that opens and closes the entrance opening, a balcony opening that communicates the inside and outside of the building, and a balcony door that opens and closes the balcony opening, and the entrance opening and the balcony opening are configured to be able to communicate through the inside of the building, and the air pressure difference adjustment device reduces the air pressure difference between the inside and outside of the building by circulating air between the inside and outside of the building, and the air pressure difference adjustment device comprises first and second air intake ports, first and second opening and closing means, first and second differential pressure gauges, and control means, and the first air intake port is configured to communicate the inside of the building with the outside in the vicinity of the entrance opening, and the second air intake port is configured to open and close the balcony door that opens and closes the balcony opening. an opening configured to connect the inside of the room with the outside in the vicinity of the balcony opening, the first opening / closing means configured to open and close the first air intake opening, the second opening / closing means configured to open and close the second air intake opening, the first differential pressure gauge configured to measure a differential pressure that is the difference in air pressure between the inside of the room and the outside in the vicinity of the entrance opening, and the second differential pressure gauge configured to measure a differential pressure that is the difference in air pressure between the inside of the room and the outside in the vicinity of the balcony opening, and the control means controls the opening and closing of the first and second opening / closing means based on the differential pressure measured by the first and second differential pressure gauges so as to reduce the difference in air pressure between the inside of the room and the outside. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-55426 [Patent Document 2] Patent No. 6940896 Summary of the Invention [Problem to be solved by the invention]

[0006] In a building equipped with a ventilation system, if the amount of air supplied or exhausted from a room is changed due to a change in the room's conditions, the balance of the air supply and exhaust volumes for the entire building may change, making it difficult to control the ventilation system.

[0007] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a ventilation system, a control device, and a ventilation method that can operate the ventilation system stably in a building where the amount of air supplied to or exhausted from a room can be changed. [Means for solving the problem]

[0008] (1) In order to solve the above problem, a ventilation system according to one aspect of the present invention includes a plurality of fans that supply air from a non-residential space to a plurality of rooms, respectively, and a control unit that, when performing a change process to change the air volume of some of the plurality of fans, performs an adjustment process to adjust the air supply to the non-residential space and / or the air volume of a fan corresponding to a room other than the fan that changes the air volume, so that the total air volume of the plurality of fans is equal to the air volume supplied to the non-residential space.

[0009] This configuration allows the change process to change the fan's airflow rate while maintaining a balance between the intake and exhaust volumes in the building, and prevents the change process from disrupting the balance of the intake and exhaust volumes in the building. Therefore, the ventilation system can operate stably in buildings where the intake or exhaust volume of rooms can be changed.

[0010] (2) When the control unit reduces the air volume of the corresponding fan in the change process to create negative pressure in the room, the control unit may change the air volume of the fan corresponding to the room other than the fan whose air volume is being changed to a larger value in the adjustment process.

[0011] This configuration automatically creates a negative pressure in the room, preventing contaminated air from leaking into other rooms, making it easy to isolate patients without performing complicated tasks. It also prevents the imbalance of air intake and exhaust volumes in the building from occurring when the room is negatively pressurized.

[0012] (3) When the control unit reduces the air volume of the corresponding fan in the change process to create negative pressure in the room, the control unit may further increase the air volume of the corresponding fan in the adjustment process to prevent other rooms from becoming negatively pressurized.

[0013] This configuration allows air to flow more reliably into the target room from other rooms while maintaining a balance between the intake and exhaust volumes in the building.

[0014] (4) The control unit may perform a process of displaying a screen that allows identification of the rooms that can be made negatively pressurized, and may perform the change process of reducing the airflow rate of the fan corresponding to the room selected on the screen.

[0015] With this configuration, the user can easily visually recognize rooms that can be made negatively pressurized, and can give instructions to the control device to make the selected room negatively pressurized.

[0016] (5) If the control unit increases the air volume of the corresponding blower in the change process based on the measurement results regarding the air in the room, the control unit may change the air volume of the blower corresponding to the room other than the blower whose air volume is being changed to a smaller value in the adjustment process.

[0017] With this configuration, the need for ventilation in a room can be detected and the room can be ventilated automatically, while maintaining a balance between the intake and exhaust volumes in the building.

[0018] (6) In the adjustment process, if the adjusted value of the air volume exceeds a predetermined limit value of the blower, the control unit may set the air volume so that it does not exceed the limit value and change the air volume of the air supply device that supplies air to the non-residential space.

[0019] With this configuration, the operation of the air supply device can be changed in cases where the blower's capacity is insufficient for the desired adjustment amount, thereby more reliably maintaining the balance between the intake and exhaust volumes of the building.

[0020] (7) In order to solve the above problem, a control device according to one aspect of the present invention performs a change process to change the airflow rate of some of a plurality of fans that supply air from a non-residential space to a plurality of rooms, and when performing the change process, includes a control unit that performs an adjustment process to adjust at least one of the air supply to the non-residential space and the airflow rate of a fan corresponding to a room other than the fan that changes the airflow rate, so that the total airflow rate of the plurality of fans is equal to the air supply rate to the non-residential space.

[0021] This configuration automatically creates a negative pressure in the room, preventing contaminated air from leaking into other rooms, making it easy to isolate patients without performing complicated tasks. It also prevents the imbalance of air intake and exhaust volumes in the building from occurring when the room is negatively pressurized.

[0022] (8) In order to solve the above problem, a ventilation method according to one aspect of the present invention is a ventilation method in a ventilation system, which includes the steps of: performing a change process to change the airflow rate of some of a plurality of fans that supply air from a non-residential space to a plurality of rooms; and, when performing the change process, performing an adjustment process to adjust at least one of the air supply to the non-residential space and the airflow rate of a fan corresponding to a room other than the fan whose airflow rate is changed, so that the total airflow rate of the plurality of fans is equal to the air supply rate to the non-residential space.

[0023] This configuration automatically creates a negative pressure in the room, preventing contaminated air from leaking into other rooms, making it easy to isolate patients without performing complicated tasks. It also prevents the imbalance of air intake and exhaust volumes in the building from occurring when the room is negatively pressurized. [Effects of the Invention]

[0024] According to the present invention, a ventilation system can be operated stably in a building in which the amount of air supplied to or exhausted from a room can be changed. [Brief explanation of the drawings]

[0025] [Figure 1] FIG. 1 is a diagram showing the configuration of a ventilation system according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing the configuration of the ventilation system according to the first embodiment of the present invention. [Figure 3] FIG. 3 is a diagram showing the configuration of a control device according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing an example of a room selection screen displayed by the control device according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a diagram showing another example of the room selection screen displayed by the control device according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a flowchart defining an operation procedure in the isolated operation mode of the control device according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a flowchart that defines the operation procedure when the control device according to the first embodiment of the present invention performs air supply and exhaust control in the isolated operation mode, and shows specific examples of air volume adjustment in each step of the flowchart. [Figure 8] FIG. 8 is a flowchart defining an operation procedure when the control device according to the first embodiment of the present invention changes the amount of air supplied to the heat exchanger. [Figure 9]FIG. 9 is a diagram showing the configuration of a ventilation system according to the second embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing the configuration of a ventilation system according to the second embodiment of the present invention. [Figure 11] FIG. 11 is a flowchart defining the operation procedure when the control device according to the second embodiment of the present invention performs air intake and exhaust control. [Figure 12] FIG. 12 is a flowchart defining the operation procedure when the control device according to the second embodiment of the present invention performs air intake and exhaust control. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and their description will not be repeated. Furthermore, at least some of the embodiments described below may be combined in any manner.

[0027] First Embodiment [Ventilation system] 1 and 2 are diagrams showing the configuration of a ventilation system according to a first embodiment of the present invention.

[0028] 1 and 2, a ventilation system 201 is installed in a building such as a house having a plurality of rooms R. The ventilation system 201 includes a plurality of fans 10, a control device 101, air conditioners 121 and 122, and a heat exchanger 131.

[0029] 1 shows, as an example, four rooms R, R1 to R4, located on the first floor of a building, and four fans 10A to 10D installed under the floor of the first floor corresponding to the rooms R1 to R4, respectively. The control device 101 and the air conditioner 121 are installed, for example, in room R1. FIG. 2 shows, as an example, three rooms R, R5 to R7, located on the second floor of a building, and three fans 10E to 10G installed under the floor of the second floor corresponding to the rooms R5 to R7, respectively. The air conditioner 122 is installed, for example, in room R5.

[0030] The present invention is not limited to a configuration in which one fan 10 is provided for one room R, and a plurality of fans 10 may be provided for one room R.

[0031] The fan 10 is installed in a non-residential space of a building and supplies air from the non-residential space to the corresponding room R. Here, the non-residential space is described as being under the floor of the building, but it is not limited to being under the floor and may be the ceiling, etc.

[0032] Each room R is provided with an air intake port Ms and an exhaust port Me. The air intake port Ms and the exhaust port Me are installed, for example, by the manufacturer of the ventilation system 201. In FIGS. 1 and 2, as an example, the air intake port Ms and the exhaust port Me of each room R are provided on the floor, connecting the room R to the underfloor space, which is a non-residential space. Note that a building may include a room R that does not have at least one of the air intake port Ms and the exhaust port Me.

[0033] The blower 10 is, for example, a fan, and has blowing blades and a motor that drives the blades. In the example shown in FIG. 1, the blowers 10A-10G are provided near the air intake ports Ms of the rooms R1-R7, respectively. The multiple blowers 10 in the ventilation system 201 supply air from the non-occupied space to the multiple rooms R, respectively. More specifically, each blower 10 rotates its own blades to supply air from under the floor to the corresponding room R via the air intake port Ms. The blower 10 changes the rotation speed of the motor to change the amount of air blown, in accordance with control information received from the control device 101 via wireless or wired communication.

[0034] When air flows into each room R from the air supply port Ms, the air from each room R joins together via the air exhaust port Me and a duct (not shown) and flows into the heat exchanger 131.

[0035] The heat exchanger 131 is installed under the first floor and drives an air supply motor (not shown) to rotate the blades of an air supply fan, thereby supplying air from outside the building to the underfloor area through a ventilation opening Mb that connects the outside of the building to the area under the floor. The heat exchanger 131 also drives an exhaust motor (not shown) to rotate the blades of the exhaust fan, thereby discharging indoor air that has flowed in via a duct (not shown) to the outside of the building through the ventilation opening Mb. The heat exchanger 131 drives the air supply motor and exhaust motor in accordance with control information received from the control device 101 via wireless or wired communication.

[0036] The heat exchanger 131 includes a heat exchange element (not shown) and exchanges heat between the air to be supplied, specifically the air outside the building flowing into the heat exchange element, and the air to be exhausted, specifically the indoor air flowing into the heat exchange element.

[0037] The air conditioners 121 and 122 adjust the temperature of the non-occupied spaces. More specifically, the air conditioners 121 and 122 supply air to underfloor spaces through supply ports Ma1 and Ma2 provided in the floors of the rooms R1 and R5, respectively. This allows the air conditioners 121 and 122 to adjust the temperature of the air underfloor spaces. The air conditioners 121 and 122 change the airflow volume and the like in accordance with control information received from the control device 101 via wireless communication or wired communication.

[0038] While air flows between the first and second floors of a building via stairs or the like, the underfloor space on the first floor, which is a non-residential space, and the underfloor space on the second floor, which is a non-residential space, are independent spaces. Heat exchanger 131 and air conditioner 121 are examples of air supply devices that supply air to the underfloor space on the first floor. Air conditioner 122 is an example of an air supply device that supplies air to the underfloor space on the second floor. Heat exchanger 131 is an example of a ventilation device that ventilates through the non-residential space.

[0039] [assignment] With the spread of ventilation systems, buildings have become more airtight and are now able to control air flow.

[0040] As mentioned above, in a building where a ventilation system is installed, if the supply or exhaust volume of a room is changed due to a change in the room's conditions, the balance of supply and exhaust volumes for the entire building will change, which may make it difficult to control the ventilation system.

[0041] For example, if the balance is lost, air leaks from gaps inside the building, making it difficult to achieve the desired control. Also, even if the air volume of a certain fan 10 is set, the air volume of that fan 10 may not reach the set value because the amount of air supplied to the underfloor area is insufficient.

[0042] Therefore, the ventilation system according to the embodiment of the present invention solves the above problem by adopting the following configuration.

[0043] [Control device] FIG. 3 is a diagram showing the configuration of a control device according to the first embodiment of the present invention.

[0044] 3, control device 101 includes communication unit 51, control unit 52, storage unit 53, and display unit 55. At least one of communication unit 51 and control unit 52 is implemented by a processor such as a CPU (Central Processing Unit) and a DSP (Digital Signal Processor). Storage unit 53 is, for example, a non-volatile memory. Storage unit 53 stores a limit value of blower 10, which will be described later. Display unit 55 is, for example, an LCD (Liquid Crystal Display) or an organic EL (Electro Luminescence) display. Note that display unit 55 may be configured to be provided outside control device 101.

[0045] The communication unit 51 performs wireless or wired communication with the fan 10, the air conditioner 121, the heat exchanger 131, and the like.

[0046] Control unit 52 sets the air volume of blower 10 by transmitting control information to blower 10 via communication unit 51. Control unit 52 sets the air volumes of air conditioners 121 and 122 by transmitting control information to air conditioners 121 and 122 via communication unit 51. Control unit 52 sets the ventilation volume of heat exchanger 131, i.e., the intake air volume and exhaust air volume, by transmitting control information to heat exchanger 131 via communication unit 51.

[0047] The control unit 52 sets the air supply to the non-occupied space and the air volume of each fan 10 so that the total air volume of the multiple fans 10 is equal to the air volume supplied to the non-occupied space.

[0048] More specifically, the control unit 52 controls the air intake and exhaust on the first floor of the building by setting the air volume of the blower 10, the air conditioner 121, and the heat exchanger 131.

[0049] Specifically, control unit 52 sets airflow rates N1 to N4 of fans 10A to 10D, airflow rate S1 of air conditioner 121, and supply air rate N0 and exhaust air rate n0 of heat exchanger 131 so as to satisfy the following formulas (1) to (3).

[0050] N0 = n0 (1) N0+S1=N1+N2+N3+N4 (2) n0=n1+n2+n3+n4+n2F (3) However, n1, n2, n3, and n4 are the exhaust amounts from rooms R1 to R4, n2F is the exhaust amount from the second floor, and n1, n2, n3, n4, n2F, N1, N2, N3, and N4>0.

[0051] Note that some of the air supplied to rooms R1 to R4 on the first floor flows to the second floor through gaps between rooms R1 to R4, stairs, etc. This results in equations (1) to (3) including n2F being established.

[0052] Furthermore, the control unit 52 sets the airflow rates N5 to N7 of the fans 10E to 10G and the airflow rate S2 of the air conditioner 122 to control the air intake and exhaust on the second floor of the building.

[0053] Specifically, control unit 52 sets airflow rates N5 to N7 of fans 10E to 10G and airflow rate S2 of air conditioner 122 so as to satisfy the following formula (4). S2=N5+N6+N7 (4)

[0054] When the above formulas are satisfied, i.e., when the balance between the intake and exhaust volumes in the building is maintained, and when predetermined conditions are met, the control unit 52 performs a change process to change the airflow volume of some of the multiple fans 10 in the ventilation system 201.

[0055] For example, a room R may be designated as an isolation room, such as when isolating a patient in that room. In this case, the air in that room R will be contaminated with viruses, etc. For this reason, the room R in which the patient is isolated must be under negative pressure. In other words, by stopping the air supply from under the floor to the isolation room, an air flow is created in which air only flows into the isolation room from the adjacent room R, and no air flows out of the adjacent room R. This ensures that air can be exhausted from the isolation room to the outside of the building through the exhaust port Me, reducing the possibility of infection to others in the building.

[0056] In such a case, the user operates a remote controller or the like to give the control device 101 an instruction to operate in the isolated operation mode.

[0057] When the communication unit 51 receives instruction information indicating an instruction to operate in the isolated operation mode from a remote controller or the like, the communication unit 51 outputs the instruction information to the control unit 52.

[0058] The control unit 52 receives the instruction information from the communication unit 51 and changes the operation mode of the control device 101 from the normal mode to the isolated operation mode.

[0059] FIG. 4 is a diagram showing an example of a room selection screen displayed by the control device according to the first embodiment of the present invention.

[0060] 4, in the isolated operation mode, the control unit 52 performs a process of displaying a room selection screen including a floor plan in which names and the like are assigned to each room R on the first and second floors of the building on the display unit 55, which is, for example, a touch panel display. The user selects a specific room R (hereinafter also referred to as a target room) by performing a tap operation or the like on the display unit 55. The control unit 52 receives operation information indicating the content of the operation from the display unit 55, and performs a process of displaying the target room on the display unit 55 in a manner different from that of the other rooms R.

[0061] FIG. 5 is a diagram showing another example of the room selection screen displayed by the control device according to the first embodiment of the present invention.

[0062] In the isolated operation mode, the control unit 52 may be configured to perform a process of displaying a screen that allows identification of rooms R that can be made negatively pressurized, and to perform a change process of reducing the airflow rate of the fan 10 corresponding to the room R selected on the screen.

[0063] 5, the control unit 52 performs processing to display, on the display unit 55, which is, for example, a touch panel display, a room selection screen in which rooms R that can be made negatively pressurized are shown in a manner different from other rooms R in a floor plan in which each room R on the first and second floors of a building is given a name or the like. The rooms R that can be made negatively pressurized are, for example, rooms R1 to R7 that have an exhaust outlet Me.

[0064] The user selects a specific room R as a target room from among the rooms R that can be made negatively pressurized by performing a tap operation or the like on the display unit 55. Note that the control unit 52 may be configured to perform processing to display the target room in a manner that is different from that of the other rooms R that can be made negatively pressurized.

[0065] The control unit 52 performs a change process to set the air volume of the corresponding fan 10 to the minimum value min in order to create a negative pressure in the target room on the room selection screen.

[0066] The minimum value min is a positive value close to zero, or zero. When the minimum value min is set to 0 as in the former case, dust in room R can be prevented from accumulating on the blower 10 side, i.e., on the filter of the blower 10 or under the floor. It can also prevent viruses and the like in the target room from flowing under the floor. For simplicity of explanation, the following description will be given using an example where the minimum value min = zero.

[0067] In this change process, if the air volume of the fan 10 in the target room is simply reduced, the balance of the intake and exhaust volumes in the building will be disrupted, for example, N0+S1>>N1+N2+N3+N4 or S2>>N5+N6+N7. In this case, air may flow into the target room through gaps in the floor, and contaminated air may flow from the target room into another room R.

[0068] Therefore, when the control unit 52 performs a change process to change the air volume of some of the multiple fans 10 in the ventilation system 201, it performs an adjustment process to adjust at least one of the air supply to the non-residential space and the air volume of the fan 10 corresponding to a room R other than the fan 10 whose air volume is being changed, so that the total air volume of the multiple fans 10 is equal to the air volume supplied to the non-residential space.

[0069] More specifically, when the control unit 52 reduces the air volume of the corresponding blower 10 in the change process to create negative pressure in the room R, the control unit 52 changes the air volume of the blower 10 corresponding to a room R other than the blower 10 whose air volume is being changed to a larger value in the adjustment process.

[0070] When the user wishes to cancel the isolated room setting, the user operates a remote control or the like to instruct the control device 101 to operate in normal mode. Upon receiving this instruction, the control device 101 changes the operation mode from the isolated operation mode to the normal mode.

[0071] [Operation flow] Next, the flow of operations in the ventilation system according to the first embodiment of the present invention will be described with reference to the drawings.

[0072] A control device according to an embodiment of the present invention includes a computer including a memory, and a processing unit such as a CPU in the computer reads from the memory and executes a program including some or all of the steps in the following flowchart. This program can be installed externally. This program is distributed in a state stored on a recording medium or via a communication line.

[0073] FIG. 6 is a flowchart defining an operation procedure in the isolated operation mode of the control device according to the first embodiment of the present invention.

[0074] Referring to FIG. 6, first, the control device 101 starts the isolated operation mode in accordance with a user's operation (step S1).

[0075] Next, the control device 101 displays a room selection screen shown in FIG. 4 or FIG. 5 on the display unit 55 (step S2).

[0076] Next, the control device 101 accepts the user's selection of the room R (step S3), and if the selected room R is a room that can be negatively pressurized (YES in step S4), performs air supply and exhaust control (step S5).

[0077] On the other hand, if the selected room R is a room that cannot be negatively pressurized (NO in step S4), the control device 101 displays on the display unit 55 that the room R cannot be selected (step S6).

[0078] Then, when the control device 101 receives instruction information indicating an instruction from the user to end the isolated operation mode, for example, the control device 101 changes the operation mode to the normal mode (YES in step S7).

[0079] On the other hand, when the control device 101 receives the selection of a new room R by the user (NO in step S7 and step S3), it checks whether the newly selected room R is a room that can be made negatively pressurized (step S4).

[0080] Fig. 7 is a flowchart defining the operation procedure when the control device according to the first embodiment of the present invention performs air supply and exhaust control in the isolated operation mode, and a diagram showing a specific example of air volume adjustment at each step of the flowchart. Fig. 7 shows details of step S5 shown in Fig. 6. In Fig. 7, the unit of air volume of the fan 10, air conditioners 121, 122, and heat exchanger 131 is [m^3 / h], and the unit of the rotation speed of the motor of the fan 10 is [rpm]. The operator "^" represents exponentiation.

[0081] Referring to FIG. 7, first, control device 101 sets the supply air volume of the target room, that is, the air volume of fan 10 corresponding to the target room, to a minimum value min (step S11).

[0082] Next, the control device 101 resets the airflow rate of each fan 10 on the first floor of the building to maintain the supply air rate N0 of the heat exchanger 131, i.e., to satisfy equation (2). This maintains the balance between the supply air rate and the exhaust air rate on the first floor of the building (step S12).

[0083] Next, the control device 101 resets the airflow rate of each fan 10 on the second floor of the building so as to satisfy the formula (4), thereby maintaining a balance between the air intake and exhaust rates on the second floor of the building (step S13).

[0084] Next, control device 101 controls the motor of each fan 10 so that the rotation speed corresponds to the air volume of each fan 10 as a result of the resetting (step S14).

[0085] In Examples 1 to 3 shown in FIG. 7, the initial state that satisfies formulas (1) to (4), that is, the initial state in which the balance of the intake and exhaust volumes of the building is maintained, is set as follows:

[0086] That is, N1=60, N2=60, N3=40, N4=80, N5=40, N6=0, N7=60, S1=100, S2=100, N1+N2+N3+N4=240, and N0=n0=140.

[0087] Furthermore, the control device 101 has preset rules for increasing or decreasing the air volume, and in this example, on each of the first and second floors, the air volume setting is changed by a fixed value, specifically, by 20 [m^3 / h], starting with the fan 10 corresponding to the room R with the lowest number. Note that the increase or decrease in the air volume of the fan 10 corresponding to the target room may be equally distributed to the air volumes of the fans 10 corresponding to the other rooms R.

[0088] Furthermore, the control device 101 may prohibit the fan 10 from setting the airflow rate to zero in rooms R on the same floor other than the target room for which the airflow rate is set to zero. That is, when the control unit 52 reduces the airflow rate of the corresponding fan 10 in the change process to create a negative pressure in the room R, the control unit 52 may further change the airflow rate of the corresponding fan 10 to a larger value in the adjustment process so as not to create a negative pressure in the other room R. This allows air to flow more reliably from the other room R into the target room.

[0089] Example 1 is when the target room is room R1 on the first floor of the building, Example 2 is when the target room is room R7 on the second floor of the building, and Example 3 is when the target rooms are rooms R5 and R7 on the second floor of the building.

[0090] In Example 1, first, N1 is set from 60 to zero (Step S11). Next, N2, N3, and N4 are increased to satisfy N0 = n0. Specifically, N2 to N4 are increased by 20 each to maintain N1 + N2 + N3 + N4 = 240 (Step S12). N5 to N7 remain unchanged (Step S13). Next, the rotation speeds of the motors of the three fans 10 whose settings have been changed are changed to 400 rpm, 300 rpm, and 500 rpm, respectively, corresponding to the changed N2 to N4 (Step S14).

[0091] In this way, by stopping the air supply from the fan 10 corresponding to the room R1, air flows into the room R1 from the other rooms R. Then, the air that has flowed into the room R1 is exhausted to the outside through the exhaust port Me.

[0092] The control unit 52 in the control device 101 is not limited to a configuration that changes the airflow rate of the fan 10 in rooms R other than the target room, but may also be configured to reduce the exhaust rate n0 of the heat exchanger 131 to satisfy N0 = n0. However, since this reduces the ventilation rate of the building, a configuration that changes the airflow rate of the fan 10 is preferable.

[0093] In Example 2, first, N7 is set from 60 to zero (step S11). N1 to N4 remain unchanged (step S12). Next, N5 and N6 are increased to satisfy S2 = N5 + N6 + N7. Specifically, N5 is increased by 40 and N6 is increased by 20, thereby maintaining N5 + N6 + N7 = 100 (step S13). Next, the rotation speeds of the motors of the two fans 10 whose settings have been changed are changed to 400 rpm and 120 rpm, respectively, which correspond to the changed N5 and N6 (step S14).

[0094] In this way, by stopping the air supply from the fan 10 corresponding to room R7, air flows into room R7 from other rooms R. Then, the air that has flowed into room R7 is exhausted to the outside through the exhaust port Me.

[0095] In Example 2, N7 is set to zero, while N6, which was zero, is changed to 20. In other words, setting the airflow volume of fan 10 to zero is prohibited in rooms R on the same floor other than the target room for which the airflow volume is set to zero.

[0096] In Example 3, first, N5 is set from 40 to zero, and N7 is set from 60 to zero (step S11). N1 to N4 remain unchanged (step S12). Next, N6 is increased to satisfy S2 = N5 + N6 + N7. Specifically, N6 is increased by 100 to maintain N5 + N6 + N7 = 100 (step S13). Next, the rotation speed of the motor of one fan 10 whose setting has been changed is changed to 500 rpm, which corresponds to the changed N6 (step S14).

[0097] For example, if N6=80 is the upper limit, i.e., the limit value, of fan 10, then in order to satisfy S2=N5+N6+N7, N6 may be set to 80 and air volume S2 of air conditioner 122 may be reduced from 100 to 80. That is, in the adjustment process, if the adjusted value of the air volume exceeds a predetermined limit value of fan 10, control unit 52 may be configured to set the air volume of fan 10 so that it does not exceed the limit value, and to change the air volume of the air supply device that supplies air to the non-occupied space.

[0098] Furthermore, in Examples 1 to 3 including the above, control unit 52 may be configured to decrease air volume S1 of air conditioner 121 or air volume S2 of air conditioner 122 in addition to increasing the air volume of fan 10 in another room R. Furthermore, in Examples 1 to 3, control unit 52 may be configured to decrease air volume S1 of air conditioner 121 or air volume S2 of air conditioner 122 instead of increasing the air volume of fan 10.

[0099] Furthermore, in Examples 1 to 3, as described above, the minimum value min may be set to 0. In this case, the minimum value min is, for example, 3 [m^3 / h].

[0100] Furthermore, in the air intake and exhaust control for the first floor, control device 101 is not limited to a configuration in which the air volume of blower 10, the air volume of air conditioner 121, and the air volume of heat exchanger 131 are adjusted, but may be configured to adjust only the air volume of blower 10, or may be configured to adjust one of the air volume of air conditioner 121 and the air volume of heat exchanger 131 and the air volume of blower 10. Furthermore, in the air intake and exhaust control for the second floor, control device 101 is not limited to a configuration in which the air volume of blower 10 and the air volume of air conditioner 122 are adjusted, but may be configured to adjust only the air volume of blower 10.

[0101] Furthermore, the building may be configured without either the heat exchanger 131 or the air conditioner 121, which are air supply devices that supply air to the underfloor space on the first floor. If the heat exchanger 131 is not provided, the air in each room R is directly exhausted to the outside of the building, for example, through an exhaust port Me and a duct (not shown).

[0102] In the control device 101, the control unit 52 may be configured to change the amount of air supplied to the heat exchanger 131 depending on the operating state of a ventilation fan 152 installed in the building.

[0103] FIG. 8 is a flowchart defining an operation procedure when the control device according to the first embodiment of the present invention changes the amount of air supplied to the heat exchanger.

[0104] Referring to FIG. 8, first, the control device 101 monitors the state of the ventilation fan 152 installed in, for example, room R2 (NO in step S21), and when the operation of the ventilation fan 152 is turned on (YES in step S21), the control device 101 stores the current air supply amount N0 of the heat exchanger 131 as Ny in the memory unit 53 (step S22).

[0105] Next, the control device 101 increases the amount of air supplied to the heat exchanger 131 by an amount equivalent to the amount of air exhausted from the ventilation fan 152, Nx (step S23).

[0106] Next, the control device 101 monitors the state of the ventilation fan 152 (NO in step S24), and if the operation of the ventilation fan 152 is turned off (YES in step S24), it returns the supply air volume N0 of the heat exchanger 131 to the original air volume Ny (step S25).

[0107] With this configuration, even if the exhaust volume in the building increases due to the operation of the ventilation fan 152, it is possible to maintain a balance between the intake and exhaust volumes of the building.

[0108] Next, other embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals and their description will not be repeated.

[0109] <Second embodiment> This embodiment relates to a ventilation system that performs air supply and exhaust control at a different trigger than the ventilation system according to the first embodiment. The contents other than those described below are the same as those of the ventilation system according to the first embodiment.

[0110] 9 and 10 are diagrams showing the configuration of a ventilation system according to a second embodiment of the present invention. Referring to Fig. 9 and 10, ventilation system 202 further includes one or more sensors 151 compared to the ventilation system according to the first embodiment of the present invention.

[0111] 9 shows, as an example, four sensors 151A to 151D provided in rooms R1 to R4 on the first floor of a building. FIG 10 shows, as an example, three sensors 151E to 151G provided in rooms R5 to R7 on the second floor of a building. Note that the sensors 151 may be provided in a part of each room R in a building.

[0112] Each sensor 151 performs measurements related to the air in room R. For example, each sensor 151 measures the pollution level of the air in room R. Specifically, for example, each sensor 151 measures the CO2 concentration in room R in which it is installed, and transmits measurement information indicating its own identification information and the measurement result of the CO2 concentration in the corresponding room R to the control device 101 via wireless communication or wired communication on a regular or irregular basis.

[0113] The sensor 151 is not limited to a configuration that measures the CO2 concentration, but may be configured to measure other substances such as carbon monoxide or dust.

[0114] In the control device 101, the communication unit 51 receives the measurement information transmitted from each sensor 151, and stores the received measurement information in the storage unit 53 in association with the reception time.

[0115] In the storage unit 53, a threshold value Thc indicating an allowable upper limit value of the CO2 concentration in each room R is registered in advance by, for example, a user.

[0116] The control unit 52 adjusts the air volume of the blower 10, the air volume of the heat exchanger 131, and the air volumes of the air conditioners 121 and 122 based on the CO 2 concentration indicated by the measurement information stored in the storage unit 53 and the threshold value Thc.

[0117] More specifically, when equations (1) to (4) are satisfied, i.e., when the balance between the intake and exhaust volumes in the building is maintained, the control unit 52 performs a change process to change the airflow volumes of some of the multiple fans 10 in the ventilation system 201 based on the measurement information received from the sensor 151, i.e., when the measurement information satisfies a predetermined condition.

[0118] For example, when the CO2 concentration in a certain room R increases and exceeds a threshold value Thc, the control device 101 performs a change process to increase the air volume of the corresponding fan 10 in order to lower the CO2 concentration in the room R.

[0119] In this change process, if the air volume of the fan 10 in the room R is simply increased, the balance of the intake and exhaust volumes in the building will be disrupted, for example, N0+S1<<N1+N2+N3+N4 or S2<<N5+N6+N7. In this case, air will leak out from gaps in the floor of room R into the space under the floor, and contaminated air may be supplied to other rooms R via the space under the floor.

[0120] Therefore, when the control unit 52 increases the air volume of the corresponding blower 10 in the change process based on the measurement results regarding the air in room R, it changes the air volume of the blower 10 corresponding to a room R other than the blower 10 whose air volume is being changed to a smaller value in the adjustment process.

[0121] Example 4 described below is a case where the target room is a room R4 on the first floor of a building, and example 5 is a case where the target room is a room R5 on the second floor of a building.

[0122] [Example 4] For example, suppose that people gather in room R4, which is the living room, and the CO2 measurement value of sensor 151D rises and exceeds threshold value Thc. In this case, control unit 52 increases airflow rate N4 of corresponding fan 10D to supply clean air to room R4. Then, control unit 52 decreases airflow rates N1 to N3 of fans 10 in the other rooms R1 to R3 on the first floor.

[0123] In addition, in the adjustment process, if the adjusted value of the air volume exceeds a predetermined limit value of the blower 10, the control unit 52 may be configured to set the air volume of the blower 10 so that it does not exceed the limit value, and to change the air volume of the air supply device that supplies air to the non-residential space.

[0124] For example, if the changed air volumes N1 to N3 are below the lower limit value, i.e., the limit value, of the blower 10, the control unit 52 sets the air volumes N1 to N3 to the lower limit value and increases the air volume S1 of the air conditioner 121 to maintain the air volume so that N0+S1=N1+N2+N3+N4 is satisfied.

[0125] Furthermore, if the changed airflow rate S1 exceeds the upper limit of the air conditioner 121, the control unit 52 sets the airflow rate S1 to the upper limit and increases the air supply rate N0 of the heat exchanger 131 to maintain the relationship N0+S1=N1+N2+N3+N4. The control unit 52 also increases the exhaust rate n0 of the heat exchanger 131 to satisfy the relationship N0=n0.

[0126] Then, when the people gathered in room R4 disperse, the CO2 measurement value of sensor 151D drops below threshold value Thc. In this case, control unit 52 restores airflow rate N4 of fan 10D corresponding to room R4. Control unit 52 also restores airflow rates N1 to N3 of fans 10 in the other rooms R1 to R3 on the first floor.

[0127] [Example 5] For example, suppose people gather in room R5, a Western-style room on the second floor, and the CO2 measurement value of sensor 151E rises and exceeds threshold value Thc. In this case, control unit 52 increases airflow rate N5 of corresponding fan 10E to supply clean air to room R5. Then, control unit 52 decreases airflow rates N6 and N7 of fans 10 in other rooms R6 and R7 on the second floor.

[0128] Here, if the changed air volumes N6 and N7 are below the lower limit value, i.e., the limit value, of the blower 10, the control unit 52 sets the air volumes N6 and N7 to the lower limit value and increases the air volume S2 of the air conditioner 122 to maintain S2=N5+N6+N7.

[0129] Then, when the people gathered in room R5 disperse, the CO2 measurement value of sensor 151E drops below threshold Thc. In this case, control unit 52 restores airflow rate N5 of fan 10E corresponding to room R5. Control unit 52 also restores airflow rates N6 and N7 of fans 10E in other rooms R6 and R7 on the second floor.

[0130] In Examples 4 and 5, control unit 52 may be configured to increase air volume S1 of air conditioner 121 or air volume S2 of air conditioner 122 instead of decreasing the air volume of fan .

[0131] [Operation flow] Next, the flow of operations in the ventilation system according to the second embodiment of the present invention will be described with reference to the drawings.

[0132] 11 and 12 are flowcharts that define the operation procedure when the control device according to the second embodiment of the present invention performs air intake and exhaust control.

[0133] 11 and 12, first, while each fan 10, whose air volume is set to a default value, is blowing air into each room R (step S31), the control device 101 waits for one minute (step S32) and receives measurement information indicating the CO2 concentration C, which is the measurement result, from the sensor 151 in each room R. Note that when the control device 101 receives measurement information multiple times within one minute from the same sensor 151, it may set the average value of the measurement results indicated by the measurement information for one minute as the CO2 concentration C (step S33).

[0134] Next, if the CO2 concentration C in each room R is less than 800 ppm (YES in step S34), the control device 101 determines that there is no abnormality, and again waits for one minute (step S32).

[0135] On the other hand, when the CO2 concentration C in a certain room R becomes 800 ppm or more, the control device 101 determines that there is an abnormality, and performs air supply and exhaust control on the room R as a target room (NO in step S34).

[0136] In the air supply and exhaust control, if the setting of the fan motor rotation speed (hereinafter also referred to as fan motor rotation speed) of the blower 10 corresponding to the target room has not reached the upper limit (NO in step S35), the control device 101 increases the setting of the fan motor rotation speed of the blower 10 by one step and decreases the setting of the fan motor rotation speed of the blower 10 corresponding to the room R on the same floor with the lowest CO2 concentration by one step. The fan motor rotation speed corresponds to the air volume of the blower 10 (step S36).

[0137] Alternatively, if the fan motor rotation speed of the blower 10 corresponding to the target room is set to the upper limit value (YES in step S35) and the air volume of the air conditioner on the same floor has not reached the upper limit value (NO in step S37), the control device 101 increases the air volume setting of the air conditioner by one level (step S38).

[0138] Alternatively, if the fan motor rotation speed of the blower 10 corresponding to the target room is set to the upper limit value (YES in step S35), the air volume of the air conditioner on the same floor has reached the upper limit value (YES in step S37), the target room is on the first floor (NO in step S39), and the ventilation volume of the heat exchanger 131 has not reached the upper limit value (NO in step S40), the control device 101 increases the ventilation volume of the heat exchanger 131, i.e., the supply air volume N0 and exhaust air volume n0, by one level (step S41).

[0139] On the other hand, if the ventilation rate of the heat exchanger 131 has reached the upper limit (YES in step S40), the control device 101 displays a warning on the display unit 55 and waits for one minute again (step S32).

[0140] Furthermore, if the fan motor rotation speed of the blower 10 corresponding to the target room is set to the upper limit value (YES in step S35), the air volume of the air conditioner on the same floor has reached the upper limit value (YES in step S37), and the target room is on the second floor (YES in step S39), the control device 101 displays a warning on the display unit 55 and waits again for one minute (step S32).

[0141] Next, when the control device 101 increases the fan motor rotation speed, air volume or ventilation volume of the air conditioner by one step, it sets Cc=C, i.e., holds the latest CO2 concentration C (step S43), waits for one minute (step S44), and receives new measurement information indicating the CO2 concentration C, which is the measurement result, from the sensor 151 in the target room (step S45).

[0142] Next, if Cc-C is less than zero, that is, if the air volume setting has been changed but the CO2 concentration in the target room has increased (YES in step S46), the control device 101 changes the air volume setting again (step S35).

[0143] On the other hand, if Cc-C is greater than or equal to zero, i.e., if the CO2 concentration in the target room after the airflow setting is changed remains constant or decreases (NO in step S46), the control device 101 sets Cc=C (step S47), waits for one minute (step S48), and receives new measurement information indicating the CO2 concentration C, which is the measurement result, from the sensor 151 in the target room (step S49).

[0144] Next, if Cc-C is less than zero, that is, if the CO2 concentration in the target room is increasing again (YES in step S50), the control device 101 changes the air volume setting again (step S35).

[0145] On the other hand, if Cc-C is equal to or greater than zero, i.e., if the CO2 concentration in the target room after the airflow setting change has remained constant or decreased for two minutes (NO in step S50) and the CO2 concentration C in the target room remains at or above 800 ppm (NO in step S51), the control device 101 sets Cc=C (step S47), waits again for one minute (step S48), and receives new measurement information indicating the measurement result, CO2 concentration C, from the sensor 151 in the target room (step S49).

[0146] On the other hand, if Cc-C is equal to or greater than zero, i.e., if the CO2 concentration in the target room after the airflow setting change remains constant or decreases for two minutes (NO in step S50) and the CO2 concentration C in the target room becomes less than 800 ppm (YES in step S51), the control device 101 cancels the setting of the target room and performs air supply and exhaust control to restore the changed airflow rates to their original values.

[0147] In air supply and exhaust control, if the target room is on the first floor (NO in step S52) and the ventilation volume of the heat exchanger 131 is not the default value (NO in step S53), the control device 101 reduces the ventilation volume of the heat exchanger 131, i.e., the air supply volume N0 and the exhaust volume n0, by one level (step S54).

[0148] Alternatively, if the target room is on the second floor (YES in step S52) or the ventilation volume of the heat exchanger 131 is the default value (YES in step S53), but the air volume of the air conditioner is not the default value (NO in step S55), the control device 101 reduces the air volume setting of the air conditioner by one level (step S56).

[0149] On the other hand, if the airflow rate of the air conditioner is the default value (YES in step S55), the control device 101 decreases the setting of the fan motor rotation speed of the blower 10 corresponding to the target room by one level, and increases the setting of the fan motor rotation speed of the blower 10 corresponding to the room R with the lowest CO2 concentration on the same floor by one level (step S57).

[0150] Next, if the fan motor rotation speed of the blower 10 in each room R has not returned to the default value (NO in step S58), the control device 101 sets Cc=C (step S47), waits again for one minute (step S48), and receives new measurement information indicating the CO2 concentration C, which is the measurement result, from the sensor 151 in the target room (step S49).

[0151] On the other hand, if the fan motor rotation speed of the blower 10 in each room R returns to the default value (YES in step S58), the control device 101 continues to monitor the CO concentration in each room R. That is, the control device 101 waits for one minute (step S32) and receives measurement information indicating the CO concentration C, which is the measurement result, from the sensor 151 in each room R (step S33).

[0152] Other configurations and operations are similar to those of the ventilation system according to the first embodiment, and therefore detailed description will not be repeated here.

[0153] The ventilation systems 201, 202 are not limited to being provided on both the first and second floors of the building, but may be provided on either the first or second floor of the building. The control device 101 may be provided on the second floor of the building, or may be provided outside the building.

[0154] Furthermore, some or all of the functions of the control device according to the embodiment of the present invention may be provided by cloud computing, i.e., the control device according to the embodiment of the present invention may be a cloud server configured by a plurality of servers.

[0155] The above-described embodiments should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0156] 10,10A~10G blower 51 Communications Department 52 Control section 53 Storage section 55 Display section 101 Control device 121,122 Air conditioner 131 Heat exchanger 151, 151A~151G Sensor 201,202 Ventilation system R, R1~R7 rooms Ma1,Ma2 supply port Mb vent Me exhaust port Ms air supply port

Claims

1. a plurality of fans that supply air from the non-habitable space to a plurality of rooms, respectively; a control unit that, when performing a change process to change the airflow rates of some of the plurality of fans, performs an adjustment process to adjust at least one of the air supply to the non-occupied space and the airflow rate of a fan corresponding to the room other than the fan whose airflow rate is being changed, so that the total airflow rate of the plurality of fans and the airflow rate of the non-occupied space become equal, when the control unit reduces the air volume of the corresponding fan in the change process to create a negative pressure in the room, the control unit changes the air volume of the fan corresponding to the room other than the fan whose air volume is being changed to a larger value in the adjustment process, In this ventilation system, when the control unit reduces the air volume of the corresponding blower in the change process to create negative pressure in the room, the control unit further adjusts the air volume in the adjustment process to prohibit the existence of another room with an air volume smaller than the reduced air volume.

2. A plurality of fans that supply air from a non-residential space to a plurality of rooms, respectively; a control unit that, when performing a change process to change the airflow rates of some of the plurality of fans, performs an adjustment process to adjust at least one of the air supply to the non-occupied space and the airflow rate of a fan corresponding to the room other than the fan whose airflow rate is being changed, so that the total airflow rate of the plurality of fans and the airflow rate of the non-occupied space become equal, In the adjustment process, if the adjusted value of the air volume exceeds a predetermined limit value of the blower, the control unit sets the air volume so that it does not exceed the limit value and changes the air volume of the air supply device that supplies air to the non-residential space.

3. The ventilation system of claim 1 or claim 2, wherein the control unit performs a process of displaying a screen on which the rooms that can be made negatively pressurized can be identified, and performs the change process of reducing the airflow rate of the blower corresponding to the room selected on the screen.

4. When the control unit reduces the air volume of the corresponding fan in the change process to create a negative pressure in the room, the control unit changes the air volume of the fan corresponding to the room other than the fan whose air volume is being changed to a larger value in the adjustment process, The ventilation system of claim 3, wherein the control unit performs a process of displaying a screen in which the rooms that can be made negatively pressurized are shown in a manner different from the other rooms, and performs the change process of reducing the airflow rate of the blower corresponding to the room that can be made negatively pressurized and selected on the screen.

5. A ventilation system described in any one of claims 1 to 4, wherein, in the adjustment process, the control unit adjusts the air supply to the non-residential space and the air volume of the blower corresponding to the room other than the blower that changes the air volume so that the total air volume of the multiple blowers is equal to the air supply volume to the non-residential space.

6. 6. The ventilation system according to claim 1, wherein, when the control unit increases the airflow rate of the corresponding blower in the change process based on the measurement results regarding the air in the room, the control unit changes the airflow rate of the blower corresponding to the room other than the blower whose airflow rate is being changed to a smaller value in the adjustment process.

7. a control unit that performs a change process to change the airflow rates of some of a plurality of fans that supply air from a non-occupied space to a plurality of rooms, and when performing the change process, adjusts at least one of the airflow rates of the fans that supply air to the non-occupied space and the airflow rates of the fans that correspond to the rooms other than the fans that change the airflow rate so that the total airflow rate of the fans is equal to the airflow rate of the non-occupied space; when the control unit reduces the air volume of the corresponding fan in the change process to create a negative pressure in the room, the control unit changes the air volume of the fan corresponding to the room other than the fan whose air volume is being changed to a larger value in the adjustment process, A control device in which, when the control unit reduces the air volume of the corresponding blower in the change process to create negative pressure in the room, the control unit further adjusts the air volume in the adjustment process to prohibit the existence of another room with an air volume smaller than the reduced air volume.

8. A control unit is provided which performs a change process to change the air volume of some of a plurality of blowers which supply air from a non-residential space to a plurality of rooms, and when performing the change process, adjusts the air supply to the non-residential space and / or the air volume of the blower corresponding to the room other than the blower whose air volume is being changed so that the total air volume of the plurality of blowers is equal to the air supply volume to the non-residential space, The control unit is a control device that, during the adjustment process, if the adjusted value of the air volume exceeds a predetermined limit value of the blower, sets the air volume so that it does not exceed the limit value and changes the air volume of the air supply device that supplies air to the non-residential space.

9. A ventilation method in a ventilation system, comprising: a step of performing a change process to change the airflow rates of some of the fans among a plurality of fans that supply air from the non-occupied space to a plurality of rooms; When performing the change process, the method includes a step of performing an adjustment process to adjust at least one of the air supply to the non-occupied space and the air volume of the fan corresponding to the room other than the fan whose air volume is being changed, so that the total air volume of the plurality of fans becomes equal to the air volume of the non-occupied space, In the step of performing the adjustment process, when the air volume of the corresponding fan is reduced in the change process to create a negative pressure in the room, the air volume of the fan corresponding to the room other than the fan whose air volume is being changed is changed to a larger value in the adjustment process, In the step of performing the adjustment process, if the air volume of the corresponding blower is reduced in the change process to create negative pressure in the room, the ventilation method further adjusts the air volume to prohibit the existence of another room with an air volume smaller than the reduced air volume.

10. A ventilation method in a ventilation system, comprising: a step of performing a change process to change the airflow rates of some of the fans among a plurality of fans that supply air from the non-occupied space to a plurality of rooms; When performing the change process, the method includes a step of performing an adjustment process to adjust at least one of the air supply to the non-occupied space and the air volume of the fan corresponding to the room other than the fan whose air volume is being changed, so that the total air volume of the plurality of fans becomes equal to the air volume of the non-occupied space, In the step of performing the adjustment process, if the adjusted value of the air volume exceeds a predetermined limit value of the blower, the air volume is set so that it does not exceed the limit value, and the air volume of the air supply device that supplies air to the non-residential space is changed.

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