TW202417790A - Control method of ventilation device, ventilation device, ventilation system, and program - Google Patents

Abstract

The present invention provides a control method for a ventilation device that can appropriately ventilate a ventilated space in response to the state of the air quality of the ventilated space. The control method for a ventilation device is a control method for a ventilation device that can switch the ventilation air volume, comprising the following steps: a determination step, determining the ratio of the set time of each ventilation air volume in a predetermined time according to the state of the air quality of the ventilated space ventilated by the aforementioned ventilation device; and a ventilation execution step, controlling the ventilation air volume in the aforementioned predetermined time according to the aforementioned ratio determined by the aforementioned determination step.

Description

Control method of ventilation device, ventilation device, ventilation system, and program

The present disclosure relates to a control method of a ventilation device, a ventilation device, a ventilation system, and a program.

Patent document 1 discloses a ventilation device for adjusting the CO2 concentration in a ventilated space. The ventilation device disclosed in Patent document 1 includes a blower, a CO2 sensor, and a control unit, and the control unit selects the operation of the blower from "strong operation", "medium operation", and "weak operation" according to the detection value of the CO2 sensor. Prior art document Patent document

Patent Document 1: International Publication No. 2020/053946

Problem to be solved by the invention This invention provides a control method, ventilation device, ventilation system, and program for a ventilation device that can appropriately ventilate a ventilated space in response to the state of the air quality of the ventilated space.

Means for solving the problem The control method of the ventilation device disclosed in the present invention is a control method of the ventilation device capable of switching the ventilation air volume, comprising the following steps: a determination step, determining the ratio of the set period of each ventilation air volume in the predetermined period according to the state of the air quality of the ventilated space ventilated by the aforementioned ventilation device; and a ventilation execution step, controlling the ventilation air volume in the aforementioned predetermined period according to the aforementioned ratio determined by the aforementioned determination step.

Furthermore, the ventilation device disclosed in the present invention is a ventilation device capable of switching the ventilation air volume, and comprises: a determination unit, which determines the ratio of the set time of each ventilation air volume in a predetermined period according to the state of the air quality of the ventilated space ventilated by the aforementioned ventilation device; and an operation control unit, which controls the ventilation air volume in the aforementioned predetermined period according to the aforementioned ratio determined by the aforementioned determination unit.

Furthermore, the ventilation system disclosed herein is a ventilation system having a ventilation device and a management device capable of switching ventilation air volumes. The management device determines the ratio of the set time of each ventilation air volume in a predetermined period according to the state of the air quality of the ventilated space ventilated by the ventilation device. The ventilation device controls the ventilation air volume in the predetermined period according to the aforementioned ratio determined by the management device.

In addition, the program disclosed in the present invention enables the processor of the ventilation device capable of switching the ventilation air volume to function as the following components: a determination unit that determines the ratio of the setting period of each ventilation air volume in the predetermined period according to the state of the air quality of the ventilated space ventilated by the aforementioned ventilation device; and an operation control unit that controls the ventilation air volume in the aforementioned predetermined period according to the aforementioned ratio determined by the aforementioned determination unit. In addition, the entire contents of Japanese Patent Application No. 2022-168602 filed on October 20, 2022 are included in this specification.

Effect of the invention The control method of the ventilation device, the ventilation device, the ventilation system, and the program disclosed in the present invention can control the ventilation volume of the ventilated space within a predetermined period of time according to the state of the air quality of the ventilated space. Accordingly, the ventilated space can be appropriately ventilated according to the state of the air quality of the ventilated space.

Form for implementing the invention (Knowledge and insights that form the basis of this disclosure, etc.) When the inventors thought of this disclosure, there was already a technology for controlling the ventilation volume of a ventilation device in response to the CO2 (carbon dioxide) concentration (hereinafter referred to as "CO2 concentration") in the regulated space. However, the ventilation volume of the ventilated space should be controlled in response to the state of the air quality of the ventilated space, such as CO2 concentration, but the inventors found that in the past, the ventilation volume could only be set to any volume within a predetermined period, and it was impossible to properly ventilate the ventilated space in response to the air quality state of the ventilated space, and in order to solve this problem, the subject of this disclosure was finally formed. Therefore, the present disclosure provides a control method, ventilation device, ventilation system, and program for a ventilation device that can appropriately ventilate the ventilated space in response to the state of the air quality of the ventilated space.

Below, the implementation form is described in detail with reference to the drawings. However, sometimes more detailed descriptions than necessary are omitted. For example, sometimes detailed descriptions of well-known matters or repeated descriptions of substantially the same structures are omitted. In addition, the attached drawings and the following descriptions are provided to enable those with ordinary knowledge in the relevant technical field to fully understand the present disclosure, and are not intended to limit the subject matter described in the scope of the patent application.

(Implementation form 1) [1-1. Configuration] [1-1-1. Configuration of ventilation system] FIG. 1 is a diagram showing the configuration of a ventilation system 1000 of implementation form 1. The ventilation system 1000 is a system for ventilating a ventilation space S inside a building H such as a residence or facility. The ventilation space S can be exemplified by a room inside the building H.

The ventilation system 1000 has a ventilation device 1. The ventilation device 1 is installed in the building H. The ventilation device 1 is provided with an air supply fan 11 and a fan motor 12 for driving the air supply fan 11. The ventilation device 1 supplies air to the ventilated space S and exhausts air from the ventilated space S by the air supply fan 11 and the fan motor 12. The ventilation device 1 of this embodiment is an example of a ceiling-embedded device. In addition, the form of the ventilation device 1 is not limited to a ceiling-embedded device, and it can also be a device in the shape of a duct that connects the ventilated space S and the outside of the building H. In addition, the ventilation device 1 can also be a device with a total heat exchanger. In addition, the ventilation device 1 can also have a filter that captures dust or microparticles, virus droplets, aerosol, etc. In addition, in the ventilated space S, corresponding to at least one of the air supply and exhaust of the ventilation device 1, at least one of the exhaust port and the air supply port is provided.

The ventilation device 1 can switch the ventilation air volume. The ventilation device 1 of this embodiment can switch the ventilation air volume to "weak wind" and "strong wind". In addition, the air volume of "strong wind" is larger than that of "weak wind". "Weak wind" is equivalent to the "second air volume" of this disclosure. "Strong wind" is equivalent to the "first air volume" of this disclosure.

The ventilation device 1 is connected to the communication device 2 installed in the building H, and communicates with the server device 3 connected to the network NW through the communication device 2. The server device 3 is equivalent to the "management device" of this disclosure.

The communication device 2 is connected to a network NW formed by a public switched telephone network, a dedicated line, or other communication circuits, and communicates with the server device 3 via the network NW. The communication device 2 functions as an interface device for connecting each device to the network NW. The communication device 2 constructs a local area network in the building H.

The ventilation system 1000 is equipped with an air quality sensor 4. The air quality sensor 4 is a sensor that detects the state of the air quality of the ventilated space S (hereinafter appropriately referred to as "air quality state"). The air quality sensor 4 detects CO2 concentration as the air quality state. The air quality sensor 4 of this embodiment is, for example, a sensor that uses a non-dispersive infrared absorption method. The air quality sensor 4 is connected to the ventilation device 1 for communication, and periodically sends the value of the detected CO2 concentration to the ventilation device 1. In addition, although FIG. 1 illustrates the case where the air quality sensor 4 is installed in the ventilated space S, the installation location of the air quality sensor 4 is not limited to the ventilated space S, and can be inside the ventilation device 1 or outside the building H.

The ventilation system 1000 includes an indoor unit 5. The indoor unit 5 and the outdoor unit together constitute an air conditioning device. The indoor unit 5 of this embodiment is an example of a ceiling cassette type indoor unit, but the indoor unit 5 may be a wall-mounted type or a ceiling-suspended type. The indoor unit 5 is connected to the communication device 2 for communication, and communicates with the server device 3 connected to the network NW through the communication device 2. The indoor unit 5 of this embodiment periodically sends the set temperature data indicating the set temperature of the ventilated space S to the server device 3.

The ventilation system 1000 is equipped with an external air sensor 6. The external air sensor 6 detects the temperature of the air outside the building H (hereinafter referred to as "external air temperature"). The external air sensor 6 is connected to the communication device 2 for communication, and communicates with the server device 3 connected to the network NW through the communication device 2. The external air sensor 6 sends the external air temperature data showing the detected external air temperature to the server device 3. In addition, although FIG. 1 illustrates the case where the external air sensor 6 is set outside the ventilation device 1 and in the ventilated space S, the setting position of the external air sensor 6 can be inside the ventilation device 1 or outside the building H.

The ventilation system 1000 is equipped with a remote controller 7. The remote controller 7 is a device for performing various settings of the ventilation device 1. The remote controller 7 has a switch for accepting various operations from the user P or a display for displaying the current settings of the ventilation device 1. The remote controller 7 is connected to the ventilation device 1 for communication and communicates with the ventilation device 1. The remote controller 7 sends information corresponding to the operation accepted from the user P to the ventilation device 1. The remote controller 7 can also be a device that can display the current settings of the indoor unit 5.

The ventilation system 1000 has a server device 3. The server device 3 is a device that processes information using the ventilation device 1, the indoor unit 5, and the external air sensor 6 as clients. The server device 3 is connected to the network NW and communicates with the ventilation device 1, the indoor unit 5, and the external air sensor 6. In addition, in each figure, although the server device 3 is represented by a block, it does not necessarily mean that the server device 3 is composed of a single device.

[1-1-2. Configuration of ventilation device] Next, the configuration of ventilation device 1 is described. FIG. 2 is a diagram showing the configuration of ventilation device 1 and server device 3.

The ventilation device 1 includes a ventilation control device 14 , a first ventilation communication unit 15 , a second ventilation communication unit 16 , a third ventilation communication unit 17 , and a fan motor 12 .

The ventilation control device 14 is a control device for controlling various parts of the ventilation device 1. The ventilation control device 14 has a processor such as a CPU (Central Processing Unit), namely a ventilation processor 100, a ventilation memory 110, and an interface circuit for connecting other devices or sensors, and controls various parts of the ventilation device 1. The ventilation processor 100 is equivalent to the "processor" disclosed in this disclosure.

The ventilation memory 110 is a memory for storing programs or data. The ventilation memory 110 stores data to be processed by the control program 111 and the ventilation processor 100. The ventilation memory 110 has a non-volatile storage area. In addition, the ventilation memory 110 may also have a volatile storage area to constitute the working area of the ventilation processor 100. The ventilation memory 110 is constituted by, for example, ROM (Read Only Memory) or RAM (Random Access Memory). The control program 111 is equivalent to the "program" disclosed in this disclosure.

The first ventilation communication unit 15 has communication hardware such as a communication circuit, and communicates with the server device 3 connected to the network NW according to the control of the ventilation control device 14. The communication standard of the first ventilation communication unit 15 may be a wireless communication standard or a wired communication standard.

The second ventilation communication unit 16 has communication hardware such as a communication circuit, and communicates with the remote controller 7 according to the control of the ventilation control device 14. The communication standard of the second ventilation communication unit 16 may be a wireless communication standard or a wired communication standard.

The third ventilation communication unit 17 has communication hardware such as a communication circuit, and communicates with the air quality sensor 4 according to the control of the ventilation control device 14. The communication standard of the third ventilation communication unit 17 can be a wireless communication standard or a wired communication standard.

The fan motor 12 rotates the air supply fan 11 at a predetermined number of revolutions according to the control of the ventilation control device 14 .

The ventilation processor 100 reads out and executes the control program 111 stored in the ventilation memory 110 , thereby functioning as a first ventilation communication control unit 101 , a second ventilation communication control unit 102 , a third ventilation communication control unit 103 , an operation control unit 104 , and a determination unit 105 .

The first ventilation communication control unit 101 communicates with the server device 3 via the first ventilation communication unit 15 .

The second ventilation communication control unit 102 communicates with the remote controller 7 via the second ventilation communication unit 16 .

The third ventilation communication control unit 103 communicates with the air quality sensor 4 through the third ventilation communication unit 17.

The operation control unit 104 controls the operation of the ventilation device 1 according to the operation mode of the ventilation device 1 set by the user P through the remote control 7. In this embodiment, the operation mode of the ventilation device 1 has two types: energy saving priority mode and comfort priority mode. The energy saving priority mode is an operation mode for the purpose of energy saving. The comfort priority mode is an operation mode for the purpose of improving the air quality state of the ventilated space S. When the second ventilation communication control unit 102 receives information specifying the energy saving priority mode from the remote control 7, the operation control unit 104 will switch the operation mode of the ventilation device 1 from the comfort priority mode to the energy saving priority mode, and perform operations corresponding to the energy saving priority mode. On the other hand, when the second ventilation communication control unit 102 receives information specifying the comfort priority mode from the remote controller 7, the operation control unit 104 switches the operation mode of the ventilation device 1 from the energy saving priority mode to the comfort priority mode, and performs operations corresponding to the comfort priority mode. When switching the operation mode, the operation control unit 104 outputs information indicating the type of the switched operation mode to the decision unit 105. The comfort priority mode is equivalent to the "first mode" of the present disclosure. The energy saving priority mode is equivalent to the "second mode" of the present disclosure.

The operation control unit 104 controls the operation of the ventilation device 1. The ventilation device 1 of this embodiment repeatedly performs 15 minutes of operation according to the set time ratio described later. The operation control unit 104 controls the fan motor 12, thereby controlling the ventilation air volume of the ventilation device 1 according to the set time ratio in one 15-minute operation. The set time ratio refers to the ratio of the first set time to the second set time in one 15-minute operation. The first set time is the period when the ventilation air volume is set to "weak wind". The second set time is the period when the ventilation air volume is set to "strong wind". The set time ratio is equivalent to the "ratio" of this disclosure. 15 minutes is equivalent to the "predetermined period" of this disclosure.

The decision unit 105 determines the set time ratio. When determining the set time ratio, the decision unit 105 obtains the average CO2 concentration during the 15-minute operation. The decision unit 105 collects the detection values of the air quality sensor 4 during the 15-minute operation through the third ventilation communication control unit 103, and obtains the average of the collected detection values. Then, the decision unit 105 determines the set time ratio based on the obtained average CO2 concentration. The method of determining the set time ratio will differ depending on whether the operation mode of the ventilation device 1 is the comfort priority mode or the energy saving priority mode.

[1-1-2-1. Determination of the setting time ratio in the case of the comfort priority mode] When the operation mode of the ventilation device 1 is the comfort priority mode, the determination unit 105 determines the setting time ratio based on the average of the obtained CO2 concentration. The determination unit 105 determines the setting time ratio according to the graph shown in FIG. 3.

Fig. 3 is a graph showing the relationship between the set time ratio and the CO2 concentration. In Fig. 3, the vertical axis shows time and the horizontal axis shows CO2 concentration. Lines L1, L2, and L3 show the set time ratio.

Line L1 is a straight line showing the time from 0ppm (parts per million) to 600ppm, and the time is 15 minutes. Line L2 is a straight line showing the time from 15 minutes to 0 minutes as the CO2 concentration increases from 600ppm to 1000ppm. Line L3 is a straight line showing the time from 1000ppm to 0 minutes.

In Figure 3, the area from 0 minutes to 15 minutes on the vertical axis is divided into two areas by lines L1, L2, and L3. Of the areas divided by lines L1, L2, and L3, the area on the right side of the figure shows the period when the ventilation air volume is set to "weak wind", and the area on the left side of the figure shows the period when the ventilation air volume is set to "strong wind".

When the operation mode of the ventilation device 1 is the comfort priority mode and the average of the obtained CO2 concentration is 600 ppm or less, the determination unit 105 determines the setting time ratio such that the first setting time is displayed as "15 minutes" and the second setting time is displayed as "0 minutes".

When the operation mode of the ventilation device 1 is the comfort priority mode and the average of the obtained CO2 concentration is greater than 600 ppm and less than 1000 ppm, the determination unit 105 determines the setting time ratio according to the following formula (1).

A1= (CO2 _IN -CO2 _LOW ) × Slope1…(1) In formula (1), A1 on the left is the ratio of the amount of ventilation required to the maximum ventilation volume, that is, the required ventilation volume ratio. In formula (1), CO2 _IN represents the average CO2 concentration. In formula (1), CO2 _LOW is the lower limit threshold of the CO2 concentration used to switch the ventilation air volume, and represents 600ppm. In formula (1), Slope1 is the value obtained by subtracting the lower limit threshold of the CO2 concentration used to switch the ventilation air volume from the upper limit threshold of the CO2 concentration used to switch the ventilation air volume. In this embodiment, it is "1000ppm-600ppm".

When the operation mode of the ventilation device 1 is the comfort priority mode and the average CO2 concentration obtained is greater than 600 ppm and less than 1000 ppm, the decision unit 105 substitutes the average CO2 concentration obtained into CO2 _IN of formula (1) to obtain A1. Next, the decision unit 105 obtains the ratio of the ventilation volume per hour in the case of "weak wind" ventilation to A1. The data of the ventilation volume has been stored in the ventilation memory 110. After obtaining the ratio, the decision unit 105 multiplies the obtained ratio by 15 minutes to obtain the first set period. Furthermore, the decision unit 105 obtains the ratio of the ventilation volume per hour in the case of "strong wind" ventilation to A1. The data of the ventilation volume has been stored in the ventilation memory 110. After obtaining the ratio, the determination unit 105 multiplies the obtained ratio by 15 minutes to obtain the second setting time. Then, the determination unit 105 determines the setting time ratio to be the setting time ratio indicating the obtained first setting time and the second setting time.

For example, when the average CO2 concentration obtained is 750 ppm, the decision unit 105 determines the setting time ratio to be a setting time ratio in which the first setting time is displayed as "8 minutes" and the second setting time is displayed as "7 minutes". For another example, when the average CO2 concentration obtained is 900 ppm, the decision unit 105 determines the setting time ratio to be a setting time ratio in which the first setting time is displayed as "3 minutes" and the second setting time is displayed as "12 minutes".

When the operation mode of the ventilation device 1 is the comfort priority mode and the average of the obtained CO2 concentration is greater than 1000 ppm, the determination unit 105 determines the set time ratio to be a set time ratio in which the first set time displays "0 minutes" and the second set time displays "15 minutes".

[1-1-2-2. Determination of the setting time ratio in the case of energy saving priority mode] When the operation mode of the ventilation device 1 is the energy saving priority mode, the determination unit 105 determines the setting time ratio based on the average of the obtained CO2 concentration, the setting temperature of the ventilated space S, and the external air temperature detected by the external air sensor 6. When the operation mode of the ventilation device 1 is the energy saving priority mode, the determination unit 105 determines the setting time ratio according to the graph shown in FIG. 4.

Fig. 4 is a graph showing the relationship between the set time ratio and the CO2 concentration. In Fig. 4, the vertical axis shows time and the horizontal axis shows CO2 concentration. Lines L4, L5, and L6 show the set time ratio.

Line L4 is a straight line showing the time of 15 minutes during the period from 0ppm to 600ppm. Line L5 is a straight line showing the time from 15 minutes to 0 minutes as the CO2 concentration increases during the period from 600ppm to 900ppm. Line L6 is a straight line showing the time of 0 minutes after 900ppm.

In Figure 6, the area from 0 minutes to 15 minutes on the vertical axis is divided into two areas by lines L4, L5, and L6. Of the areas divided by lines L4, L5, and L6, the area on the right side of the figure shows the period when the ventilation air volume is set to "weak wind", and the area on the left side of the figure shows the period when the ventilation air volume is set to "strong wind".

When the operation mode of the ventilation device 1 is the energy saving priority mode and the average CO2 concentration obtained is below 600 ppm, the determination unit 105 determines the set time ratio to be a set time ratio in which the first set time displays "15 minutes" and the second set time displays "0 minutes".

When the operation mode of the ventilation device 1 is the energy saving priority mode and the average of the obtained CO2 concentration is greater than 600 ppm and less than 900 ppm, the determination unit 105 determines the setting time ratio according to the formula (2).

A2= ((CO2 _IN -CO2 _LOW ) ×Slope2) ×(1-C ₂ (T _IA -T _SA ))…(2) In formula (2), A2 on the left is the same as A1, which is the ratio of the amount of ventilation required relative to the maximum ventilation volume, that is, the required ventilation volume ratio. In formula (2), CO2 _IN represents the average CO2 concentration. In formula (2), CO2 _LOW is the lower limit threshold of the CO2 concentration used to switch the ventilation air volume, and represents 600ppm. In formula (2), Slope2 is the value obtained by subtracting the lower limit threshold of the CO2 concentration used to switch the ventilation air volume from the upper limit threshold of the CO2 concentration used to switch the ventilation air volume, and this embodiment is "900ppm-600ppm". In formula (2), C2 is a constant used to consider winter. In formula (2), ( _{TIA -TSA} ) is the temperature difference between the temperature in the ventilated space S and the outside air temperature, and indicates the state of the outside air load.

When the operation mode of the ventilation device 1 is the energy saving priority mode and the average CO2 concentration obtained is greater than 600 ppm and less than 900 ppm, the decision unit 105 substitutes the average CO2 concentration obtained into CO2 _IN of formula (2), substitutes the set temperature indicated by the set temperature data into T _IA of formula (2), and substitutes the outside air temperature indicated by the outside air temperature data into T _SA of formula (2). Then, the decision unit 105 obtains A2. Next, the decision unit 105 obtains the ratio of the ventilation volume per hour in the case of "weak wind" ventilation to A2. After obtaining the ratio, the decision unit 105 multiplies the obtained ratio by 15 minutes to obtain the first set period. Furthermore, the decision unit 105 obtains the ratio of the ventilation volume per hour in the case of ventilation with "strong wind" to A2. After obtaining the ratio, the decision unit 105 multiplies the obtained ratio by 15 minutes to obtain the second setting time. Then, the decision unit 105 determines the setting time ratio to be the setting time ratio that displays the obtained first setting time and the second setting time.

When the operation mode of the ventilation device 1 is the energy saving priority mode and the average CO2 concentration obtained is greater than 900 ppm, the determination unit 105 determines the set time ratio to be a set time ratio in which the first set time displays "15 minutes" and the second set time displays "0 minutes".

[1-1-3. Configuration of server device] Next, the configuration of server device 3 is described. As shown in FIG2 , server device 3 includes a server control device 30 and a server communication unit 31. The server control device 30 is a control device for controlling each unit of server device 3. The server control device 30 includes a processor such as a CPU, namely a server processor 300, a server memory 310, and an interface circuit for connecting to other devices or sensors, and controls each unit of server device 3.

The server memory 310 is a memory for storing programs or data. The server memory 310 stores data to be processed by the control program 311, the management data 312, and the server processor 300. The server memory 310 has a non-volatile storage area. In addition, the server memory 310 may also have a volatile storage area to constitute a working area of the server processor 300. The server memory 310 is constituted by, for example, ROM or RAM.

The management data 312 is data for managing the set temperature of the indoor unit 5 and the outside air temperature detected by the outside air sensor 6. The management data 312 includes the set temperature data and the outside air temperature data.

The server communication unit 31 has communication hardware such as a communication circuit, and communicates with the ventilation device 1, the indoor unit 5, and the external air sensor 6 connected to the network NW according to the control of the server control device 30. The communication standard of the server communication unit 31 can be a wireless communication standard or a wired communication standard.

The server processor 300 reads and executes the control program 311 stored in the server memory 310 , thereby functioning as a server communication control unit 301 and a server processing unit 302 .

The server communication control unit 301 communicates with the ventilation device 1, the indoor unit 5 and the external air sensor 6 through the server communication unit 31.

The server processing unit 302 processes the management data 312. When the server communication control unit 301 receives the set temperature data from the indoor unit 5, the server processing unit 302 updates the set temperature data described in the management data 312 to the received set temperature data. When the server communication control unit 301 receives the external air temperature data from the external air sensor 6, the server communication control unit 301 updates the external air temperature data described in the management data 312 to the received external air temperature data.

[1-2. Operation] Next, the operation of each part of the ventilation system 1000 of this embodiment will be described. FIG. 5 is a flow chart FA showing the operation of the ventilation device 1.

The operation control unit 104 determines whether the 15-minute operation has been completed (step SA1). When the operation control unit 104 determines that the 15-minute operation has not been completed (step SA1: No), the determination of step SA1 is performed again.

On the other hand, when operation control unit 104 determines that the 15-minute operation has ended (step SA1: Yes), decision unit 105 determines whether the operation mode of ventilation device 1 is the comfort priority mode or the energy saving priority mode (step SA2). In step SA2, decision unit 105 determines the operation mode of ventilation device 1 based on the information output from operation control unit 104.

When it is determined that the operation mode of the ventilation device 1 is the comfort priority mode (step SA2: comfort priority mode), the determination unit 105 determines the setting time ratio (step SA3). Step SA3 is equivalent to the "determination step" of this disclosure.

In step SA3, the decision unit 105 obtains the average CO2 concentration in the most recently completed 15-minute operation. Then, the decision unit 105 determines the set time ratio based on the obtained average CO2 concentration and equation (1).

Next, the operation control unit 104 executes the operation for 15 minutes according to the set time ratio determined in step SA3 (step SA4).

In step SA4, the ventilation air volume is controlled according to the set time ratio determined in step SA3. More specifically, the operation control unit 104 first sets the ventilation air volume to "strong wind" to operate the ventilation device 1 in the first set time shown in the set time ratio, and after the first set time, the ventilation air volume is set to "weak wind" to operate the ventilation device 1 in the second set time shown in the set time ratio. Step SA4 is equivalent to the "ventilation execution step" of the present disclosure.

Returning to the description of step SA2, when the decision unit 105 determines that the operation mode of the ventilation device 1 is the energy-saving priority mode (step SA2: energy-saving priority mode), the first ventilation communication control unit 101 sends the first request information to the server device 3 (step SA5).

The first request information is information requesting the set temperature data and the outside air temperature data. In addition, when the server communication control unit 301 receives the first request information from the ventilation device 1, it reads the set temperature data and the outside air temperature data from the management data 312, and sends the two data read out to the ventilation device 1 as a response to the first request information.

Next, the first ventilation communication control unit 101 receives the set temperature data and the external air data from the server device 3 (step SA6).

Next, the determination unit 105 determines the setting period ratio (step SA7). Step SA7 is equivalent to the "determination step" of this disclosure.

In step SB4, the decision unit 105 obtains the average CO2 concentration in the most recently completed 15-minute operation. Next, the decision unit 105 substitutes the obtained average CO2 concentration into CO2 _IN of formula (2), substitutes the set temperature indicated by the set temperature data received in step SA6 into T _IA of formula (2), and substitutes the outside air temperature indicated by the outside air temperature data received in step SA6 into T _SA of formula (2), and obtains A2. Then, the decision unit 105 determines the set time ratio based on the obtained A2.

Next, the operation control unit 104 executes the operation for 15 minutes according to the set time ratio determined in step SA7 (step SA8).

In step SA8, the ventilation air volume is controlled according to the setting time ratio determined in step SA7. More specifically, the operation control unit 104 first sets the ventilation air volume to "strong wind" to operate the ventilation device 1 during the first setting time indicated by the setting time ratio, and then sets the ventilation air volume to "weak wind" to operate the ventilation device 1 during the second setting time indicated by the setting time ratio after the first setting time. Step SA8 is equivalent to the "ventilation execution step" of the present disclosure.

Figure 6 is a graph showing the average ventilation volume per minute. In Figure 6, the vertical axis shows the average ventilation volume per minute, and the horizontal axis shows the CO2 concentration.

In FIG6 , graphs GF1 and GF2 are shown. Graph GF1 shows the average ventilation volume per minute in the conventional ventilation volume control. Here, the conventional ventilation volume control means that when the CO2 concentration is less than 600ppm, the ventilation volume is set to "weak wind", and when the CO2 concentration is more than 600ppm, the ventilation volume is set to "strong wind". Graph GF2 shows the average ventilation volume per minute in the ventilation volume control of this embodiment.

By comparing the graphs GF1 and GF2, it is clear that in the range of CO2 concentration from 600ppm to 1000ppm, the average ventilation volume per minute can be changed linearly compared to the past. Accordingly, the ventilation device 1 of this embodiment can suppress over-ventilation and can appropriately ventilate the ventilation space S in accordance with the CO2 concentration.

[1-3. Effects, etc.] As described above, the control method of the ventilation device 1 capable of switching the ventilation air volume includes the following steps: a determination step, determining the ratio of the set time of each ventilation air volume within 15 minutes, i.e., the set time ratio, according to the state of the air quality of the ventilation space S ventilated by the ventilation device 1; and a ventilation execution step, controlling the ventilation air volume within 15 minutes according to the set time ratio determined by the determination step.

Thereby, the ventilation amount of the ventilated space S within 15 minutes can be controlled according to the state of the air quality of the ventilated space S. According to this, the ventilated space S can be appropriately ventilated according to the state of the air quality of the ventilated space S.

The control method of the ventilation device 1 sets the ventilation air volume to "strong wind" and then sets the ventilation air volume to "weak wind" according to the set time ratio in the ventilation execution step.

Thus, during the 15-minute operation, ventilation is first performed with "strong wind", so that the air quality of the ventilated space S can be quickly improved after the 15-minute operation starts. Therefore, the comfort of the user P in the ventilated space S can be improved.

In the determination step of the control method of the ventilation device 1, when the operation mode of the ventilation device 1 is a comfort priority mode for the purpose of improving the air quality state, the set time ratio is determined according to the state of the air quality. In the determination step of the control method of the ventilation device 1, when the operation mode of the ventilation device 1 is an energy saving priority mode for the purpose of saving energy, the set time ratio is determined according to the state of the air quality and the state of the external air load.

Thus, since the method of determining the setting time ratio is different according to the operation mode of the ventilation device 1, the ventilation space S can be properly ventilated taking into account the operation mode of the ventilation device 1.

In the determination step, the control method of the ventilation device 1 determines the set time ratio within the next 15 minutes based on the state of the air quality within the current 15 minutes.

Thus, since the set time ratio within the next 15 minutes is determined in consideration of the current air quality state, the set time ratio can be appropriately determined in consideration of the state of the air quality of the ventilated space S. Therefore, the ventilated space S can be ventilated more appropriately in accordance with the state of the air quality of the ventilated space S.

The ventilation device 1 comprises: a determination unit 105, which determines the ratio of the set time of each ventilation air volume within 15 minutes, i.e., the set time ratio, according to the state of the air quality of the ventilated space S; and an operation control unit 104, which controls the ventilation air volume within 15 minutes according to the set time ratio determined by the determination unit 105.

Thereby, the same effect as the control method of the above-mentioned ventilation device 1 is achieved.

The control program 111 enables the ventilation processor 100 of the ventilation device 1 to function as the following components: a determination unit 105, which determines the ratio of the set time of each ventilation air volume within 15 minutes, i.e., the set time ratio, based on the state of the air quality of the ventilated space S; and an operation control unit 104, which controls the ventilation air volume within 15 minutes according to the set time ratio determined by the determination unit 105.

Thereby, the same effect as the control method of the above-mentioned ventilation device 1 is achieved.

(Implementation Form 2) Next, the implementation form 2 will be described. In the description of the implementation form 2, the same symbols are attached to the components that are the same as the components of each part of the ventilation system 1000 of the implementation form 1, and the detailed description is appropriately omitted.

[2-1. Configuration] [2-1-1. Configuration of ventilation system] FIG. 7 is a diagram showing the configuration of the ventilation system 2000 in the second embodiment. The ventilation system 2000 includes a ventilation device 1A, a server device 3A, an air quality sensor 4A, an indoor unit 5, an external air sensor 6, and a remote controller 7.

Compared with the ventilation device 1, the ventilation device 1A does not have the third ventilation communication unit 17. In addition, compared with the ventilation device 1, the ventilation processor 100 of the ventilation device 1A has different functions. Compared with the server device 3, the server processor 300 of the server device 3A and the data stored in the server memory 310 are different.

The air quality sensor 4A has a different destination for sending the detected value than the air quality sensor 4. The air quality sensor 4A is connected to the communication device 2 for communication and sends the air quality data to the server device 3A. The air quality data includes the detected value detected by the air quality sensor 4A.

[2-1-2. Configuration of ventilation device] Next, the configuration of the ventilation device 1A is described. FIG. 8 is a diagram showing the configuration of the ventilation device 1A and the server device 3A.

By comparing FIG8 with FIG2 , it is clear that the ventilation device 1A has a ventilation control device 14, a first ventilation communication unit 15, a second ventilation communication unit 16, and a fan motor 12, and on the other hand, does not have a third ventilation communication unit 17. In addition, by comparing FIG8 with FIG2 , it is clear that the ventilation processor 100 of the second embodiment reads and executes the control program 111A stored in the ventilation memory 110, thereby functioning as the first ventilation communication control unit 101A, the second ventilation communication control unit 102, and the operation control unit 104.

The first ventilation communication control unit 101A communicates with the server device 3 via the first ventilation communication unit 15 .

[2-1-3. Configuration of server device] Next, the configuration of the server device 3A is described. Comparing FIG8 with FIG2, it can be clearly seen that the server memory 310 stores the control program 311A and the management data 312A. The control program 311A is a program that enables the server processor 300 to function as the server communication control unit 301A, the server processing unit 302A, and the decision unit 303. The management data 312A is data for managing the set temperature of the indoor unit 5, the external air temperature detected by the external air sensor 6, and the CO2 concentration detected by the air quality sensor 4. In the management data 312, the set temperature data, the external air temperature data, and the air quality data are recorded.

The server processor 300 of the second embodiment reads and executes the control program 311A stored in the server memory 310, thereby functioning as a server communication control unit 301A, a server processing unit 302A, and a determination unit 303.

The server communication control unit 301A communicates with the ventilation device 1A, the air quality sensor 4A, the indoor unit 5 and the external air sensor 6 through the server communication unit 31.

The server processing unit 302A processes the management data 312A. When the server communication control unit 301A receives the set temperature data and the external air temperature data, the server processing unit 302A processes the data in the same manner as the server processing unit 302. Furthermore, when the server communication control unit 301A receives the air quality data from the air quality sensor 4, the server processing unit 302A adds the air quality data to the management data 312A. In addition, the air quality data added to the management data 312A is deleted from the management data 312A each time the determination unit 303 determines the set time ratio.

The determination unit 303 is a functional unit similar to the determination unit 105. The determination unit 303 refers to the management data 312A and determines the setting period ratio similar to the determination unit 105.

[2-2. Action] Next, the action of each part of the ventilation system 2000 in the second embodiment is described. FIG. 9 is a flowchart showing the action of the ventilation device 1A and the server device 3A. In FIG. 9 , the flowchart FB shows the action of the device 1A, and the flowchart FC shows the action of the server device 3A.

As shown in the flowchart FB, the operation control unit 104 determines whether the 15-minute operation has been completed (step SB1). When the operation control unit 104 determines that the 15-minute operation has not been completed (step SB1: No), the determination of step SB1 is performed again.

On the other hand, when the operation control unit 104 determines that the 15-minute operation has ended (step SB1: Yes), the first ventilation communication control unit 101A sends the second request information to the server device 3A (step SB2). The second request information is information requesting the setting time ratio. The second request information includes information indicating the type of the current operation mode of the ventilation device 1A.

As shown in flowchart FD, server communication control unit 301A receives the second request information from ventilation device 1 (step SD1).

Next, the determination unit 303 determines the setting period ratio based on the second request information received in step SD1 (step SD2).

This is described in detail in step SD2. The decision unit 303 determines whether the information included in the second request information received in step SD1 indicates the display of the comfort priority mode or the display of the energy saving priority mode. When the decision unit 303 determines that the display of the comfort priority mode is in progress, all air quality data are obtained from the management data 312A, and the average of the CO2 concentrations indicated by the obtained air quality data is calculated. Furthermore, the decision unit 303 determines the setting time ratio in the same way as the decision unit 105 when the operation mode of the ventilation device 1 is the comfort priority mode. In addition, in this embodiment, the data of the ventilation volume per hour under the condition of "weak wind" ventilation and the data of the ventilation volume per hour under the condition of "strong wind" ventilation are stored in the server memory 310.

When the decision unit 303 determines that the energy saving priority mode is displayed, the setting temperature data, the external air temperature data, and the air quality data are obtained from the management data 312A. Then, the decision unit 303 calculates the average of the CO2 concentrations indicated by the obtained air quality data. Then, the decision unit 303 determines the setting time ratio in the same way as the decision unit 105 when the operation mode is the energy saving priority mode, based on the setting temperature indicated by the obtained setting temperature data, the external air temperature indicated by the obtained external air temperature data, and the average of the calculated CO2 concentration.

Returning to the description of flowchart FD, server communication control unit 301A transmits setting time ratio information indicating the setting time ratio determined in step SD2 to ventilation device 1A as a response to the second request information (step SD3).

As shown in the flowchart FC, the first ventilation communication control unit 101A receives the setting time ratio information from the server device 3A (step SC3).

Next, the operation control unit 104 executes the operation for 15 minutes according to the set time ratio indicated by the set time ratio information received in step SC3 (step SC4).

[2-3. Effects, etc.] The ventilation system 2000 has a ventilation device 1A and a server device 3A that can switch the ventilation air volume. The server device 3A determines the ratio of the set time of each ventilation air volume within 15 minutes, that is, the set time ratio, according to the state of the air quality of the ventilated space S. The ventilation device 1 controls the ventilation air volume within 15 minutes according to the set time ratio determined by the server device 3A.

Thereby, the same effect as implementation form 1 is achieved.

(Other implementation forms) As described above, the above-mentioned implementation forms 1 and 2 are described as examples disclosed in this application. However, the technology disclosed in this disclosure is not limited to this, and can also be applied to implementation forms that have been changed, replaced, added, omitted, etc. In addition, each component described in the above-mentioned implementation forms 1 and 2 can be combined to create a new implementation form. Therefore, other implementation forms are exemplified below.

In the above-mentioned embodiments 1 and 2, when the average CO2 concentration is in the range of 600ppm to 1000ppm, or in the range of 600ppm to 900ppm, the ventilation air volume is switched during the 15-minute operation. However, the lower limit threshold of the CO2 concentration for switching the ventilation air volume is not limited to 600ppm, and the upper limit threshold of the CO2 concentration for switching the ventilation air volume is not limited to 1000ppm or 900ppm. These thresholds may be any values, but are preferably values specified by laws, regulations, WELL certification, etc. of the country where the ventilation device 1 is installed. For example, the lower threshold value may be set to 600 ppm as specified by LEED (Leadership in Energy & Environmental Design), which is one of the environmental performance evaluation systems. Also, for example, the upper threshold value may be set to 1000 ppm as specified by the Building Management Act.

In the above-mentioned embodiments 1 and 2, the case where the types of ventilation air volumes that can be switched by the ventilation devices 1 and 1A are exemplified as "weak wind" and "strong wind". In other embodiments, the types of ventilation air volumes that can be switched by the ventilation devices 1 and 1A can be 3 or more. For example, in other embodiments, the types of ventilation air volumes that can be switched by the ventilation devices 1 and 1A can be set to 3 types: "weak wind", "medium wind" and "strong wind". In addition, the air volume of "medium wind" is larger than that of "weak wind", and the air volume is smaller than that of "strong wind".

In the above-mentioned embodiments 1 and 2, although 15 minutes is exemplified as the "predetermined time" of the present disclosure, the "predetermined time" of the present disclosure is not limited to 15 minutes.

In the above-mentioned embodiments 1 and 2, there are two types of operation modes of the ventilation device 1 and 1A, namely, the comfort priority mode and the energy saving priority mode. In other embodiments, the ventilation device 1 and 1A can be switched to different types of operation modes in addition to the above-mentioned two modes.

In the above-mentioned embodiments 1 and 2, although the ventilation air volume is switched from "strong wind" to "weak wind" during the 15-minute operation, in other embodiments, the ventilation air volume may be switched from "weak wind" to "strong wind".

In the above-mentioned embodiments 1 and 2, the set time ratio related to the next 15-minute operation is determined based on the average CO2 concentration in the current 15-minute operation. In other embodiments, the set time ratio related to the next 15-minute operation can also be determined based on the highest CO2 concentration among the CO2 concentrations in the current 15-minute operation. In other embodiments, the set time ratio related to the next 15-minute operation can also be determined based on the latest CO2 concentration among the CO2 concentrations in the current 15-minute operation.

In the above-mentioned embodiment 2, the server device 3A is exemplified as the "management device" of the present disclosure. However, the "management device" of the present disclosure is not limited to the server device 3A, and may be, for example, a centralized management device that manages various machines in the building H in a centralized manner.

In the above-mentioned embodiment 2, the ventilation device 1A requests the server device 3A to set the time ratio. In other embodiments, even if the ventilation device 1A does not request the time ratio, the server device 3A may send the time ratio information to the ventilation device 1A. In this other embodiment, the server device 3A knows the current operation mode of the ventilation device 1A, and the server device 3A knows the time point when the ventilation device 1A has finished operating for 15 minutes.

In the above-mentioned embodiments 1 and 2, the setting time ratio is determined by considering the difference between the setting temperature of the indoor unit 5 and the outside air temperature as the state of the outside air load. In other embodiments, the setting time ratio may be determined by considering the difference between the humidity of the ventilated space S and the air humidity outside the building H as the state of the outside air load.

In the above-mentioned embodiments 1 and 2, the CO2 concentration of the ventilated space S is exemplified as the state of the air quality of the ventilated space S, and the configuration of determining the set time ratio is based on the CO2 concentration. In other embodiments, a configuration of determining the set time ratio based on the concentration of pollen or the concentration of micro-particle-like substances such as PM2.5, etc., instead of the CO2 concentration, or together with the CO2 concentration, can also be made. In the case of this configuration, the air quality sensor 4, 4A detects the concentration of pollen or the concentration of micro-particle-like substances such as PM2.5, etc., as the air quality, instead of the CO2 concentration, or together with the CO2 concentration. Furthermore, in the case of this other embodiment, the detection values of the air quality sensors 4 and 4A may be replaced by the ventilation device 1 and the server device 3A obtaining meteorological information recording the concentration of pollen or the concentration of micro-particle-like substances from a predetermined server connected to the network NW.

The ventilation processor 100 and the server processor 300 may be formed by a single processor or by a plurality of processors. These processors may also be hardware designed to implement corresponding functional units. In other words, these processors may also be formed by, for example, ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array).

The configuration of the ventilation device 1, 1A and the server device 3, 3A shown in FIG2 and FIG8 is only an example, and the specific installation form is not particularly limited. That is, it is not necessary to install corresponding hardware in each part, and a configuration in which the functions of each part are realized by a processor executing a program can also be made. In addition, part of the functions realized by software in the above-mentioned implementation form can be made into hardware, or part of the functions realized by hardware can also be realized by software.

The step units of the actions shown in FIG. 5 and FIG. 9 are divided according to the main processing content for easy understanding of the actions. The actions are not limited by the division method or name of the processing unit. It can also be divided into more step units according to the processing content. In addition, it can also be divided into one step unit to include more processing. In addition, the order of the steps can also be appropriately exchanged within the scope that does not hinder the purpose of this disclosure.

In addition, since the above-mentioned embodiments are used to illustrate the embodiments of the technology in the present disclosure, various changes, substitutions, additions, omissions, etc. can be made within the scope of the patent application or its equivalent.

(Note) The above description of the implementation form reveals the following technology.

(Technique 1) A control method for a ventilation device, which is a control method for a ventilation device capable of switching ventilation air volume, comprises the following steps: a determination step, determining the ratio of the set period of each ventilation air volume in a predetermined period according to the state of the air quality of the ventilated space ventilated by the aforementioned ventilation device; and a ventilation execution step, controlling the ventilation air volume in the aforementioned predetermined period according to the aforementioned ratio determined by the aforementioned determination step. Thereby, the ventilation volume of the ventilated space in the predetermined period can be controlled in response to the state of the air quality of the ventilated space. Accordingly, the ventilated space can be appropriately ventilated in response to the state of the air quality of the ventilated space.

(Technique 2) A control method for a ventilation device as in Technique 1, wherein in the ventilation execution step, the ventilation air volume is set to the first air volume according to the ratio, and then the ventilation air volume is set to the second air volume. Thereby, two ventilation air volumes with different air volumes are switched sequentially. Therefore, the ventilation space can be properly ventilated by simply controlling the ventilation air volume.

(Technique 3) A control method for a ventilation device as in Technique 2, wherein the first air volume is larger than the second air volume. Thereby, since ventilation is first performed with the first air volume, the air quality of the ventilated space can be improved rapidly. Therefore, the comfort of users in the ventilated space can be improved.

(Technique 4) A control method for a ventilation device as in any one of Techniques 1 to 3, wherein in the aforementioned determination step, when the operation mode of the aforementioned ventilation device is the first mode for the purpose of improving the state of the aforementioned air quality, the aforementioned ratio is determined according to the state of the aforementioned air quality, and when the operation mode of the aforementioned ventilation device is the second mode for the purpose of energy saving, the aforementioned ratio is determined according to the state of the aforementioned air quality and the state of the external air load. Thereby, since the determination method of the ratio of the setting period is different depending on the operation mode of the ventilation device, it can be considered that the operation mode of the ventilation device will be properly ventilated in the ventilation space.

(Technique 5) A control method for a ventilation device as in any one of Techniques 1 to 4, wherein in the aforementioned determination step, the aforementioned ratio in the aforementioned predetermined period of the next time is determined based on the state of the aforementioned air quality in the aforementioned predetermined period of the current time. Thereby, the set time ratio in the next predetermined period of the current operation is determined taking into account the state of the air quality of the ventilated space during the current operation. Therefore, the set time ratio can be determined by appropriately taking into account the state of the air quality of the ventilated space, and the ventilated space can be ventilated more appropriately in response to the state of the air quality of the ventilated space.

(Technique 6) A ventilation device capable of switching ventilation air volume comprises: a determination unit that determines the ratio of the set time of each ventilation air volume in a predetermined period according to the state of the air quality of the ventilated space ventilated by the ventilation device; and an operation control unit that controls the ventilation air volume in the predetermined period according to the aforementioned ratio determined by the determination unit. Thereby, the same effect as the control method of the ventilation device of technique 1 is exerted.

(Technique 7) A ventilation system is a ventilation system having a ventilation device and a management device capable of switching ventilation air volume, wherein the management device determines the ratio of the setting period of each ventilation air volume in a predetermined period according to the state of the air quality of the ventilated space ventilated by the ventilation device, and the ventilation device controls the ventilation air volume in the predetermined period according to the aforementioned ratio determined by the management device. Thereby, the same effect as the control method of the ventilation device of Technique 1 is exerted.

(Technique 8) A program that enables a processor of a ventilation device capable of switching ventilation air volume to function as the following components: a determination unit that determines the ratio of the set period of each ventilation air volume in a predetermined period according to the state of the air quality of the ventilated space ventilated by the ventilation device; and an operation control unit that controls the ventilation air volume in the predetermined period according to the aforementioned ratio determined by the determination unit. Thereby, the same effect as the control method of the ventilation device of Technique 1 is exerted.

Industrial Applicability As described above, the control method of the ventilation device, the ventilation device, the ventilation system, and the program of the present invention can be used to ventilate the ventilated space in accordance with the state of the air quality of the ventilated space.

1,1A: Ventilation device 2: Communication device 3,3A: Server device 4,4A: Air quality sensor 5: Indoor unit 6: External air sensor 7: Remote control 11: Air supply fan 12: Fan motor 14: Ventilation control device 15: First ventilation communication unit 16: Second ventilation communication unit 17: Third ventilation communication unit 30: Server control device 31: Server communication unit 100: Ventilation processor 101,101A: First ventilation communication control unit 102: Second ventilation communication control unit 103: Third ventilation communication control unit 104: Operation control unit 105,303: Decision unit 110: Ventilation memory 111,111A,311,311A: Control program 300: Server processor 301,301A: Server communication control unit 302,302A: Server processing unit 310: Server memory 312,312A: Management data 1000,2000: Ventilation system S: Ventilated space FA~FD: Flowchart GF1,GF2: Graphics H: Building L1~L6: Line NW: Network P: User SA1~SA8,SB1~SB4,SC1~SC4,SD1~SD3: Steps

FIG. 1 is a diagram showing the configuration of the ventilation system in embodiment 1. FIG. 2 is a diagram showing the configuration of the ventilation device and the server device in embodiment 1. FIG. 3 is a graph showing the relationship between the set time ratio and the CO2 concentration in embodiment 1. FIG. 4 is a graph showing the relationship between the set time ratio and the CO2 concentration in embodiment 1. FIG. 5 is a flow chart showing the operation of the ventilation device in embodiment 1. FIG. 6 is a graph showing the average ventilation volume within 15 minutes in embodiment 1. FIG. 7 is a diagram showing the configuration of the ventilation system in embodiment 2. FIG. 8 is a diagram showing the configuration of the ventilation device and the server device in embodiment 2. FIG. 9 is a flow chart showing the operation of the ventilation device and the server device in embodiment 2.

FA: Flowchart

SA1~SA8: Steps

Claims (8)

A control method for a ventilation device is a control method for a ventilation device capable of switching ventilation air volume, comprising the following steps: A determination step, determining the ratio of the set time of each ventilation air volume in a predetermined time according to the state of the air quality of the ventilated space ventilated by the aforementioned ventilation device; and A ventilation execution step, controlling the ventilation air volume in the aforementioned predetermined time according to the aforementioned ratio determined by the aforementioned determination step. A control method for a ventilation device as claimed in claim 1, wherein in the ventilation execution step, according to the above ratio, the ventilation air volume is set to the first air volume, and then the ventilation air volume is set to the second air volume. A control method for a ventilation device as claimed in claim 2, wherein the first air volume is larger than the second air volume. A control method for a ventilation device as claimed in any one of claims 1 to 3, wherein in the aforementioned determination step, when the operation mode of the aforementioned ventilation device is the first mode for the purpose of improving the state of the aforementioned air quality, the aforementioned ratio is determined according to the state of the aforementioned air quality, when the operation mode of the aforementioned ventilation device is the second mode for the purpose of energy saving, the aforementioned ratio is determined according to the state of the aforementioned air quality and the state of the external air load. A control method for a ventilation device as in any one of claims 1 to 3, wherein in the aforementioned determination step, the aforementioned ratio in the aforementioned predetermined period next time is determined based on the state of the aforementioned air quality in the aforementioned predetermined period this time. A ventilation device is a ventilation device capable of switching ventilation air volume, comprising: a determination unit, which determines the ratio of the setting time of each ventilation air volume in a predetermined period according to the state of the air quality of the ventilated space ventilated by the ventilation device; and an operation control unit, which controls the ventilation air volume in the predetermined period according to the aforementioned ratio determined by the determination unit. A ventilation system is a ventilation system having a ventilation device and a management device capable of switching ventilation air volume, wherein the management device determines the ratio of the set time of each ventilation air volume in a predetermined time according to the state of the air quality of the ventilated space ventilated by the ventilation device, and the ventilation device controls the ventilation air volume in the predetermined time according to the aforementioned ratio determined by the management device. A program enables a processor of a ventilation device capable of switching ventilation air volume to function as the following components: A determination unit determines the ratio of the set time of each ventilation air volume in a predetermined time according to the state of the air quality of the ventilated space ventilated by the ventilation device; and An operation control unit controls the ventilation air volume in the predetermined time according to the aforementioned ratio determined by the determination unit.

Images