Method for controlling ventilation device, control device, and control program

Abstract

To provide a method for controlling a ventilation device the air volume of which can be adjusted so as to make safety and comfortability of users compatible.SOLUTION: A method for controlling a ventilation device 1 constituted so that an air volume W is adjustable comprises: a first setting step where a first air volume W1 of the ventilation device 1 is set on the basis of a carbon dioxide concentration CC in a space S ventilated by the ventilation device 1; a determination step of determining whether to increase the air volume W or not; and a second setting step where the first air volume W1 is increased to a second air volume W2 when it is determined that the air volume W is increased in the determination step. In the determination step, it is determined that the air volume W is increased when a comfort temperature TB of a user P existing in the space S and an outdoor air temperature TQ are lower than a room temperature TJ, and when the comfort temperature TB and the outdoor air temperature TQ are higher than the room temperature TJ.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present disclosure relates to a control method, a control device, and a control program for a ventilation device. [Background technology]

[0002] Patent Document 1 discloses a ventilation device that adjusts the concentration of CO2 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" based on the detection value of the CO2 sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 053946 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a control method, a control device, and a control program for a ventilation device that can adjust the air volume so as to balance the safety and comfort of a user. [Means for solving the problem]

[0005] The control method for a ventilation device in the present disclosure is a control method for a ventilation device configured to be able to adjust the airflow, and includes a first setting step of setting a first airflow rate of the ventilation device based on a concentration of substances harmful to the human body in a space ventilated by the ventilation device, a determination step of determining whether or not to increase the airflow rate, and a second setting step of increasing the first airflow rate to a second airflow rate when it is determined in the determination step that the airflow rate should be increased, wherein in the determination step, it is determined that the airflow rate is to be increased when a comfort temperature of a user present in the space and an outdoor air temperature are lower than an indoor temperature, and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature.

[0006] Another ventilation device control method in the present disclosure is a ventilation device control method that adjusts the airflow based on the concentration of substances harmful to the human body in a space ventilated by the ventilation device, and when the concentration of the substance harmful to the human body is a first concentration, adjusts the airflow so that a third airflow, which is the airflow when the comfort temperature of a user present in the space and the outside air temperature are lower than the indoor temperature, or when the comfort temperature and the outside air temperature are higher than the indoor temperature, is greater than a fourth airflow, which is the airflow when the indoor temperature is between the comfort temperature and the outside air temperature.

[0007] In addition, the control device in the present disclosure is a control device for a ventilation device configured to adjust the air volume, and includes a first setting unit that sets a first air volume of the ventilation device based on the concentration of substances harmful to the human body in the space ventilated by the ventilation device, a judgment unit that judges whether to increase the air volume, and a second setting unit that increases the first air volume to a second air volume when the judgment unit judges that the air volume should be increased, and the judgment unit judges to increase the air volume when the comfort temperature of a user present in the space and the outside air temperature are lower than the indoor temperature, and when the comfort temperature and the outside air temperature are higher than the indoor temperature.

[0008] In addition, the control program of the present disclosure is a control program for a ventilation device configured to adjust the airflow, and causes a processor to function as a first setting unit that sets a first airflow rate of the ventilation device based on the concentration of substances harmful to the human body in the space ventilated by the ventilation device, a judgment unit that judges whether to increase the airflow rate, and a second setting unit that increases the first airflow rate to a second airflow rate when the judgment unit judges that the airflow rate should be increased, and the judgment unit judges to increase the airflow rate when the comfort temperature of a user present in the space and the outside air temperature are lower than the indoor temperature, and when the comfort temperature and the outside air temperature are higher than the indoor temperature. Effect of the Invention

[0009] The control method, control device, and control program for a ventilation device disclosed herein set a first airflow rate of the ventilation device based on the concentration of a substance harmful to the human body, and determine whether to increase the airflow rate based on a user's comfort temperature, an outdoor air temperature, and an indoor temperature, so that ventilation can be performed to achieve both safety and comfort for the user. For example, when the comfort temperature and the outdoor air temperature are lower than the indoor temperature, and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature, the first airflow rate is increased to the second airflow rate, so that the indoor temperature can be brought closer to the comfort temperature. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of the configuration of a ventilation system according to an embodiment of the present invention; [Diagram 2] FIG. 1 is a schematic cross-sectional view of a ventilation device according to an embodiment of the present invention in a heat exchange ventilation mode; [Diagram 3] FIG. 1 is a schematic cross-sectional view of a ventilation device according to an embodiment of the present invention in a normal ventilation mode; [Figure 4] FIG. 1 is a diagram showing an example of the configuration of a ventilation device according to an embodiment of the present invention; [Diagram 5] FIG. 2 is a diagram showing an example of the configuration of a server device according to the present embodiment; [Figure 6] FIG. 1 is a diagram illustrating an example of a determination process of a server device. [Figure 7] A flowchart showing an example of a process executed by the server device. [Figure 8] A flowchart showing an example of a determination process executed by the server device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (The knowledge and other information that formed the basis of this disclosure) At the time when the inventors came up with the present disclosure, there was a technique for controlling the air volume of a ventilation device in accordance with the concentration of CO2 (carbon dioxide) in a space ventilated by the ventilation device. However, the inventors discovered that controlling the airflow rate of the ventilation device in accordance with the CO2 concentration can result in reduced user comfort, and in order to solve this problem, they have come up with the subject matter of the present disclosure. That is, if increasing the airflow rate of the ventilation device would bring the indoor temperature closer to the user's comfort temperature, the airflow rate is increased. Conversely, if increasing the airflow rate of the ventilation device would bring the indoor temperature away from the user's comfort temperature, the airflow rate is not increased. In this way, by adjusting the airflow rate of the ventilation device, ventilation can be performed to achieve both safety and comfort for the user. The "safety" of the user refers to the degree to which substances harmful to the human body contained in the air in the space the user is in affect the user's health. Also, the "comfort" of the user refers to the degree of comfort when the user does not feel thermal discomfort such as hot or cold in the space the user is in. In view of this, the present disclosure provides a control method, a control device, and a control program for a ventilation device that adjusts the air volume so as to achieve both safety and comfort for a user.

[0012] Hereinafter, the embodiments will be described in detail with reference to the drawings. However, in some cases, more detailed explanations than necessary may be omitted. For example, detailed explanations of already well-known matters or duplicate explanations of substantially the same configurations may be omitted. It should be noted that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0013] [1. Configuration] [1-1. Configuration of ventilation system] FIG. 1 is a diagram showing an example of the configuration of a ventilation system 100 according to this embodiment. The ventilation system 100 is a system that ventilates a space S provided inside a building H of a non-residential facility such as a house or an office. The space S is a space to be ventilated by the ventilation device 1. The space S is, for example, a room provided inside the building H.

[0014] As shown in FIG. 1, the ventilation system 100 includes a ventilation device 1, a communication device 2, and a server device 3. The ventilation device 1 is communicably connected to a communication device 2 set in the building H. The ventilation device 1 communicates, via the communication device 2, with a server device 3 connected to a network NW.

[0015] The communication device 2 is connected to a network NW consisting of a public line network, a leased line, and 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 establishes a local network in the building H. The communication device 2 includes a connector and an interface circuit, and is connected to the first control unit 24. The communication device 2 is an interface for communicating with the server device 3.

[0016] The ventilation device 1 is installed in a building H. The ventilation device 1 includes an intake fan 17, an exhaust fan 18, and a total heat exchanger 20. Air supplied from outdoors to indoors by the intake fan 17 and air exhausted from indoors to outdoors by the exhaust fan 18 are heat exchanged by the total heat exchanger 20. The configuration of the ventilation device will be described in [1-2. Configuration of the ventilation device] with reference to Figs. 2 and 3.

[0017] The ventilation device 1 of this embodiment is exemplified as a ceiling-embedded device. The type of the ventilation device 1 is not limited to the ceiling-embedded type device, and may be, for example, a duct-shaped device that communicates the space S with the outside of the building H. The ventilation device 1 may be a wall-embedded type or a floor-standing type. The ventilation device 1 may be equipped with a filter that captures dust, fine particles, virus droplets, aerosols, and the like. An air intake port is provided in the space S to accommodate the air intake of the ventilation device 1.

[0018] The ventilation device 1 is configured to be capable of adjusting the air volume W of the air supplied to the space S. The ventilation device 1 of this embodiment is capable of adjusting the air volume W, for example, to five levels (WA to WE). The air volume W will be further described with reference to FIGS.

[0019] In this embodiment, a case will be described in which the "substance harmful to the human body" is carbon dioxide. The ventilation system 100 includes a carbon dioxide sensor 4 . The carbon dioxide sensor 4 detects a carbon dioxide concentration CC in the space S. The carbon dioxide sensor 4 in this embodiment is, for example, a sensor that employs a non-dispersive infrared absorption method. The carbon dioxide sensor 4 is communicatively connected to the communication device 2, and communicates with the server device 3 connected to the network NW via the communication device 2. The carbon dioxide sensor 4 periodically transmits the detected value of the carbon dioxide concentration CC to the server device 3. The carbon dioxide sensor 4 is provided in the space S. The carbon dioxide concentration CC corresponds to an example of the "concentration of a substance harmful to the human body."

[0020] In this embodiment, a case will be described where the "substances harmful to the human body" are carbon dioxide, but the "substances harmful to the human body" are not limited to carbon dioxide. The "substances harmful to the human body" may be, for example, PM2.5. The "substances harmful to the human body" may also be, for example, viruses. The "substances harmful to the human body" may also be, for example, mites.

[0021] The ventilation device 1 may include a plurality of ventilation devices 1, for example, a ventilation device 1A and a ventilation device 1B. For example, as shown in Fig. 1, a ventilation device 1A may be placed on one side (here, the right side) of the ceiling of a building H, and a ventilation device 1B may be placed on the other side (here, the left side) of the ceiling of the building H. In this case, a carbon dioxide sensor 4 is placed in correspondence with each of the multiple ventilation devices 1. As shown by the solid line, the ventilation device 1A placed on one side of the ceiling corresponds to a carbon dioxide sensor 4A placed in a position close to one side of the ceiling. Also, as shown by the dashed line, the ventilation device 1B placed on the other side of the ceiling corresponds to a carbon dioxide sensor 4B placed in a position close to the other side of the ceiling.

[0022] The ventilation system 100 is equipped with an inside air temperature sensor 5 . The inside air temperature sensor 5 detects the temperature TJ of the air inside the building H (hereinafter referred to as "room temperature TJ"). The inside air temperature sensor 5 is communicatively connected to the communication device 2, and communicates with the server device 3 connected to the network NW via the communication device 2. The inside air temperature sensor 5 transmits inside air temperature data indicating the detected room temperature TJ to the server device 3. As shown in FIG. 1, the inside air temperature sensor 5 is disposed on a wall surface of the building H.

[0023] The ventilation system 100 is equipped with an outside air temperature sensor 6 . The outside air temperature sensor 6 detects the temperature TQ of the air outside the building H (hereinafter referred to as "outside air temperature TQ"). The outside air temperature sensor 6 is communicatively connected to the communication device 2, and communicates with the server device 3 connected to the network NW via the communication device 2. The outside air temperature sensor 6 transmits outside air temperature data indicating the detected outside air temperature TQ to the server device 3. The outside air temperature sensor 6 is disposed outside the building H. The outside air temperature sensor 6 is disposed, for example, outside the building H, below the ventilation device 1. The outside air temperature sensor 6 may also be located, for example, inside the building H. The outside air temperature sensor 6 may also be disposed, for example, near an air intake port that takes in outside air into the room.

[0024] The ventilation system 100 includes a remote control 7 . The remote control 7 is a device for making various settings of the ventilator 1. The remote control 7 includes switches for accepting various operations from the user P, a display for displaying the settings of the ventilator 1, and the like. The remote control 7 is communicatively connected to the ventilator 1, for example, via infrared communication, and communicates with the ventilator 1. The remote control 7 transmits information corresponding to the operations accepted from the user P to the ventilator 1.

[0025] The ventilation system 100 includes a server device 3. The server device 3 is connected to the network NW, and is communicatively connected to the ventilation device 1, the carbon dioxide sensor 4, the inside air temperature sensor 5, and the outside air temperature sensor 6 via the communication device 2. The server device 3 communicates with the ventilation device 1, the carbon dioxide sensor 4, the inside air temperature sensor 5, and the outside air temperature sensor 6 via the network NW and the communication device 2. Note that in each drawing, the server device 3 is represented by one block, but this does not necessarily mean that the server device 3 is composed of a single device.

[0026] [1-2. Configuration of ventilation system] Next, the configuration of the ventilation device 1 will be described with reference to Fig. 2 and Fig. 3. Fig. 2 is a schematic cross-sectional view of the ventilation device 1 according to this embodiment in a case where a heat exchange ventilation mode M1 is performed. Fig. 3 is a schematic cross-sectional view of the ventilation device 1 according to this embodiment in a case where a normal ventilation mode M2 ​​is performed. The ventilation device 1 has a substantially rectangular parallelepiped housing 10. Inside the housing 10, there are provided an air supply flow path 11 through which air flows that is introduced from outside and supplied to a room that is a space to be air-conditioned, that is, the so-called supply air, and an exhaust flow path 12 through which air flows that is introduced from inside the room and exhausted to the outside, that is, the so-called exhaust air. An outside air supply port 13 is provided at the upstream end of the air supply passage 11. An indoor air supply port 14 is provided at the downstream end of the air supply passage 11. An indoor air return port 15 is provided at the upstream end of the exhaust flow path 12. An outside air exhaust port 16 is provided at the downstream end of the exhaust flow path 12.

[0027] An air supply fan 17 is disposed in the air supply flow path 11. When the air supply fan 17 is operated, air flows through the air supply flow path 11 and is supplied to the room. The hatched arrows indicate the air flow caused by the air supply fan 17. When the air supply fan 17 is operated, outdoor air OA flows in through the outdoor air inlet 13, the air flows through the air supply flow path 11, and supply air SA is supplied to the room from the indoor air inlet 14. An exhaust fan 18 is disposed in the exhaust flow path 12. When the exhaust fan 18 is operated, air flows through the exhaust flow path 12 and is exhausted from inside the room. The white arrows indicate the air flow caused by the exhaust fan 18. When the exhaust fan 18 is operated, exhaust air RA from inside the room flows in through the indoor air return port 15, the air flows through the air supply flow path 12, and the exhaust air EA is exhausted outside through the outdoor air exhaust port 16. A total heat exchanger 20 is disposed on the intake air passage 11 and the exhaust air passage 12 .

[0028] The total heat exchanger 20 of this embodiment is a so-called orthogonal type total heat exchanger 20, in which the intake air passage 11 and the exhaust air passage 12 are perpendicular to each other. The total heat exchanger 20 is made of a porous base material containing, for example, a hydrophilic resin or a flame-retardant chemical, and rectangular plate-shaped base materials having linear passages are alternately stacked while changing their orientation to form the total heat exchanger 20 in the shape of a rectangular prism in which the intake air passage 11 and the exhaust air passage 12 are perpendicular to each other. The total heat exchanger 20 of this embodiment exchanges heat between the air flowing through the air intake passage 11 and the air flowing through the exhaust passage 12 .

[0029] A bypass air duct 27 is provided in the exhaust air flow path 12 of the ventilation device 1, allowing the exhaust air to bypass the total heat exchanger 20. An air duct switching damper 26 that opens and closes the bypass air duct 27 is provided in the exhaust air flow path 12 of the ventilation device 1. By opening and closing the bypass air duct 27 with the switching damper 26, the ventilation device 1 can be switched between a heat exchange ventilation mode M1 and a normal ventilation mode M2. As shown in Fig. 2, the ventilation device 1 can be set to a heat exchange ventilation mode M1 by closing the bypass air passage 27 with the switching damper 26. Also, as shown in Fig. 3, the ventilation device 1 can be set to a normal ventilation mode M2 ​​by opening the bypass air passage 27 with the switching damper 26.

[0030] 4 is a diagram showing an example of the configuration of the ventilation device 1 according to this embodiment. As shown in FIG. 4, the ventilation device 1 includes a first control unit 24, a fan motor 22, and a first communication interface 25.

[0031] The first control unit 24 controls each part of the ventilator 1. The first control unit 24 includes a first processor 14A, which is a processor such as a CPU (Central Processing Unit), and a first memory 14B.

[0032] The first memory 14B is a memory that stores programs and data. The first memory 14B stores the first control program 144, data to be processed by the first processor 14A, and the like. The first memory 14B has a non-volatile storage area. The first memory 14B may also have a volatile storage area and configure a work area for the first processor 14A. The first memory 14B is configured, for example, by a ROM (Read Only Memory) or a RAM (Random Access Memory).

[0033] The first communication interface 25 includes communication hardware such as a communication circuit, and communicates with the server device 3 via the communication device 2 and the network NW in accordance with instructions from the first control unit 24. The communication standard of the first communication interface 25 may be a wireless communication standard or a wired communication standard. In this embodiment, the first communication interface 25 communicates with the server device 3 in accordance with, for example, the Ethernet (registered trademark) standard.

[0034] Fan motor 22 rotates blower fan 21 at a predetermined rotation speed in accordance with an instruction from first control unit 24. Blower fan 21 corresponds to, for example, air supply fan 17 shown in FIG. The fan motor 22 adjusts the rotation speed of the blower fan 21 to adjust the air volume W supplied to the space S. The fan motor 22 of this embodiment can adjust the air volume W to, for example, five levels. The air volume W is represented by a minimum air volume WA, a small air volume WB, a medium air volume WC, a large air volume WD, and a maximum air volume WE. The minimum air volume WA to the maximum air volume WE satisfy the relationship of the following formula (1). W.A. <WB<WC<WD<WE (1) The fan motor 22 increases the air volume W by increasing the rotation speed. The air volume W will be further described with reference to FIG.

[0035] The first control unit 24 includes a first acquisition unit 141, an operation control unit 142, a first communication control unit 143, and a first data storage unit 145. The first processor 14A functions as a first acquisition unit 141, an operation control unit 142, and a first communication control unit 143 by reading and executing a first control program 144 stored in the first memory 14B. In addition, the first processor 14A causes the first memory 14B to function as a first data storage unit 145 by reading and executing a first control program 144 stored in the first memory 14B.

[0036] The first data storage unit 145 stores, for example, the air volume W instructed by the server device 3. The air volume W is acquired from the server device 3 by the first acquisition unit 141 and stored in the first data storage unit 145 by the first acquisition unit 141.

[0037] The first acquisition unit 141 acquires an instruction for the air volume W from the server device 3. Furthermore, in the case where the ventilation device 1 has the total heat exchanger 20, the first acquisition unit 141 acquires an instruction for the operation mode of the total heat exchanger 20 from the server device 3. The operation modes include a heat exchange ventilation mode M1 and a normal ventilation mode M2. In the heat exchange ventilation mode M1, as shown in Fig. 2, the air passage switching damper 26 closes the bypass air passage 27, and the supply air fan 17 and the exhaust air fan 18 are rotated at a predetermined rotation speed. As a result, the supply air and the exhaust air pass through the total heat exchanger 20, and heat exchange occurs between the supply air and the exhaust air. In normal ventilation mode M2, as shown in Fig. 3, switching damper 26 opens bypass air passage 27 and rotates supply air fan 17 and exhaust air fan 18 at a predetermined rotation speed. As a result, supply air passes through total heat exchanger 20, but exhaust air bypasses total heat exchanger 20 and passes through bypass air passage 27. This allows ventilation without heat exchange between the supply air and exhaust air.

[0038] The operation control unit 142 controls the rotation speed of the fan motor 22 according to the instruction for the air volume W from the server device 3. Furthermore, when the ventilation device 1 has the total heat exchanger 20, the operation control unit 142, in accordance with an instruction from the server device 3, operates the ventilation device 1 in the heat exchange ventilation mode M1 or the normal ventilation mode M2.

[0039] The first communication control unit 143 communicates with the server device 3 via the first communication interface 25. The first communication control unit 143 receives, for example, an instruction on the airflow volume W from the server device 3 via the first communication interface 25. Furthermore, when the ventilation device 1 has the total heat exchanger 20, the first communication control unit 143 receives an instruction for the operation mode from the server device 3 via the first communication interface 25.

[0040] [1-3. Server device configuration] Next, a description will be given of the configuration of the server device 3. Fig. 5 is a diagram showing an example of the configuration of the server device 3 according to the present embodiment. As shown in Fig. 5, the server device 3 includes a second control unit 31, a second operation mechanism 34, a second display mechanism 35, and a second communication interface 36. The second control unit 31 controls each unit of the server device 3. The second control unit 31 includes a second processor 32 which is a processor such as a CPU, a second memory 33, and an interface circuit for connecting other devices and sensors, and controls each unit of the server device 3. The server device 3 corresponds to an example of a "control device" in the present disclosure.

[0041] The second memory 33 is a memory that stores programs and data. The second memory 33 stores a second control program 331, data processed by the second processor 32, and the like. The second memory 33 has a non-volatile storage area. The second memory 33 may also have a volatile storage area and constitute a work area for the second processor 32. The second memory 33 is constituted by, for example, a ROM or a RAM.

[0042] The second operation mechanism 34 includes input means such as a keyboard and a mouse connected to the server device 3, detects an operation of the user on the input means, and outputs a detection signal corresponding to the operation to the second control unit 31. The second control unit 31 executes a process corresponding to the user's operation based on the input from the second operation mechanism 34. The user is, for example, an administrator of the server device 3.

[0043] The second display mechanism 35 is equipped with a plurality of LEDs (Light Emitting Diodes), an LCD (Liquid Crystal Display), etc., and performs operations such as turning on, off, and blinking the LEDs in a predetermined manner and displaying information on the LCD according to instructions from the second control unit 31.

[0044] Moreover, the second communication interface 36 includes a connector and an interface circuit, and is connected to the second control unit 31. The second communication interface 36 is an interface for communicating with the communication device 2 in accordance with, for example, the Ethernet (registered trademark) standard.

[0045] The second control unit 31 includes a second acquisition unit 321 , a first setting unit 322 , a determination unit 323 , a second setting unit 324 , an instruction unit 325 , a second communication control unit 326 , and a second data storage unit 332 . The second processor 32 functions as a second acquisition unit 321, a first setting unit 322, a judgment unit 323, a second setting unit 324, an instruction unit 325, and a second communication control unit 326 by reading and executing the second control program 331 stored in the second memory 33. In addition, the second processor 32 reads out and executes a second control program 331 stored in the second memory 33, thereby causing the second memory 33 to function as a second data storage unit 332. The second processor 32 corresponds to an example of a "processor." The second control program 331 corresponds to an example of a "control program."

[0046] In addition, in the case where the ventilation device 1 has the total heat exchanger 20, the second control unit 31 further includes a mode selection unit 327. In addition, in the case where the ventilation device 1 includes a plurality of ventilation devices 1, the second control unit 31 further includes a device selection unit 328. In the following description, first, a case will be described in which the second control unit 31 includes a second acquisition unit 321, a first setting unit 322, a determination unit 323, a second setting unit 324, an instruction unit 325, a second communication control unit 326, and a second data storage unit 332. Then, a case will be described in which the second control unit 31 includes a mode selection unit 327, and a case will be described in which the second control unit 31 includes a device selection unit 328.

[0047] The second data storage unit 332 stores the carbon dioxide concentration CC, the indoor temperature TJ, and the outdoor air temperature TQ. The carbon dioxide concentration CC, the indoor temperature TJ, and the outdoor air temperature TQ are acquired by the second acquisition unit 321 and stored in the second data storage unit 332 by the second acquisition unit 321. Further, the second data storage unit 332 stores the comfortable temperature TB. The comfortable temperature TB is set in advance by the second acquisition unit 321, and is stored in the second data storage unit 332 by the second acquisition unit 321. The first concentration, the second concentration, and the third concentration may be the same as each other, or may be different from each other.

[0048] The second acquisition unit 321 acquires the carbon dioxide concentration CC from the carbon dioxide sensor 4. In addition, the second acquisition unit 321 acquires the room temperature TJ from the inside air temperature sensor 5. In addition, the second acquisition unit 321 acquires the outside air temperature TQ from the outside air temperature sensor 6. The second acquisition unit 321 stores the acquired carbon dioxide concentration CC, indoor temperature TJ, and outdoor temperature TQ in the second data storage unit 332. The "first concentration" corresponds to an example of the carbon dioxide concentration CC. The "first concentration" is, for example, 800 ppm. The "second concentration" corresponds to an example of the carbon dioxide concentration CC. The "second concentration" is, for example, 700 ppm. The "third concentration" corresponds to an example of the carbon dioxide concentration CC. The "third concentration" is, for example, 900 ppm.

[0049] Furthermore, the second acquisition unit 321 receives an operation from the remote control 7 via, for example, the first control unit 24 of the ventilation device 1, and sets a comfortable temperature TB for the user P based on the received operation. The second acquisition unit 321 sets the comfort temperature TB based on, for example, a comfort index. The comfort index is composed of, for example, the indoor temperature TJ, humidity, radiant heat, air flow, the amount of clothing, and the amount of activity. Humidity is the humidity in the space S. Humidity is detected by a humidity sensor or the like. Radiant heat is heat directly transmitted from walls, ceilings, floors, furniture, solar radiation, etc., and is detected in advance according to the position of the user P in the space S. Airflow is detected in advance using a known method such as an airflow sensor in accordance with the position of the user P in the space S. The amount of clothing worn is expressed, for example, by a Clo value (CLO value). The Clo value is an index showing the insulating and heat-retaining properties of clothing. The Clo value is calculated, for example, from the amount of clothing worn by user P. The amount of activity is expressed as the amount of heat generated by the body of user P. The amount of activity is expressed as a Metabolic Equivalent (MET) value. The MET value is calculated from user P's posture, behavior, etc. In this embodiment, for convenience, a case where the comfortable temperature TB is set in advance will be described.

[0050] The first setting unit 322 sets a first airflow rate W1 of the ventilation device 1 based on the carbon dioxide concentration CC in the space S ventilated by the ventilation device 1. The first air volume W1 is a necessary and minimum air volume corresponding to the carbon dioxide concentration CC. The first air volume W1 corresponds to an example of a "third air volume." The first air volume W1 corresponds to an example of a "fifth air volume." The first air volume W1 corresponds to an example of a "seventh air volume."

[0051] The first setting unit 322 calculates the first air volume W1, for example, by the following formula (2). W1 = [(CC-CCL) / SL] × WS (2) In formula (1), threshold CCL is a lower limit threshold of the carbon dioxide concentration CC for adjusting the air volume W, and is, for example, 600 ppm. In formula (1), fluctuation range SL is a value obtained by subtracting the lower limit threshold of the carbon dioxide concentration CC for adjusting the air volume W (600 ppm) from the upper limit threshold of the carbon dioxide concentration CC for adjusting the air volume W (for example, 1000 ppm), and is, for example, 400 ppm (= 1000 ppm - 600 ppm) in this embodiment. Reference air volume WS is a reference value of the air volume W.

[0052] The determination unit 323 determines whether or not to increase the air volume W of the ventilation device 1, based on the room temperature TJ and the outdoor temperature TQ acquired by the second acquisition unit 321, and the comfort temperature TB. The determination unit 323 determines to increase the air volume W of the ventilation device 1, for example, when the comfort temperature TB and the outdoor air temperature TQ are lower than the room temperature TJ, and when the comfort temperature TB and the outdoor air temperature TQ are higher than the room temperature TJ. The processing of the determination unit 323 will be further described with reference to FIGS.

[0053] When the determination unit 323 determines that the air volume W of the ventilation device 1 should be increased, the second setting unit 324 increases the first air volume W1 to the second air volume W2. When the first setting unit 322 sets, for example, the first air volume W1 to the minimum air volume WA and the judgment unit 323 judges that the air volume W of the ventilation device 1 should be increased, the second setting unit 324 increases the minimum air volume WA, which is the first air volume W1, to a small air volume WB, which is the second air volume W2. When the determining unit 323 determines not to increase the air volume W of the ventilation device 1, the second setting unit 324 maintains the first air volume W1. For example, when the first setting unit 322 sets the first air volume W1 to the minimum air volume WA and the determination unit 323 determines not to increase the air volume W of the ventilator 1, the second setting unit 324 maintains the minimum air volume WA, which is the first air volume W1. In other words, the second setting unit 324 sets the minimum air volume WA as the second air volume W2. The second air volume W2 corresponds to an example of a "fourth air volume." The second air volume W2 corresponds to an example of a "sixth air volume." The second air volume W2 corresponds to an example of the "eighth air volume."

[0054] When the determination unit 323 determines to increase the air volume W of the ventilation device 1, the instruction unit 325 instructs the ventilation device 1 to adjust the air volume W to the second air volume W2 set by the second setting unit 324. In other words, the instruction unit 325 transmits an instruction CM to the ventilation device 1 to adjust the air volume W to the second air volume W2.

[0055] The second control unit 31 repeatedly executes the process of the second acquisition unit 321, the process of the first setting unit 322, the process of the determination unit 323, the process of the second setting unit 324, and the process of the instruction unit 325 at every predetermined period PP. The predetermined period PP is, for example, 15 minutes. Furthermore, in the processing of the first setting unit 322, the first air volume W1 for the next predetermined period PP is determined based on the carbon dioxide concentration CC for the current predetermined period PP. The determination unit 323 determines whether or not to increase the air volume W in the next predetermined period PP based on the current indoor temperature TJ, outdoor temperature TQ, and comfort temperature TB. For example, if the comfort temperature TB and the outdoor temperature TQ are lower than the indoor temperature TJ during the current specified period PP, and if the comfort temperature TB and the outdoor temperature TQ are higher than the indoor temperature TJ during the current specified period PP, the judgment unit 323 judges to increase the airflow W during the next specified period PP. The processing of the second control unit 31 will be described with reference to FIG.

[0056] The second communication control unit 326 receives the carbon dioxide concentration CC from the carbon dioxide sensor 4 via the network NW and the communication device 2. In addition, the second communication control unit 326 receives the room temperature TJ from the inside air temperature sensor 5 via the network NW and the communication device 2. In addition, the second communication control unit 326 receives the outside air temperature TQ from the outside air temperature sensor 6 via the network NW and the communication device 2. In addition, the second acquisition unit 321 receives an operation from the remote control 7 via the network NW, the communication device 2, and the ventilator 1, for example. Furthermore, the instruction unit 325 transmits an instruction CM to the ventilator 1 via the network NW and the communication device 2.

[0057] When the ventilation device 1 has the total heat exchanger 20, the mode selection unit 327 switches, as an operation mode of the ventilation device 1, between a heat exchange ventilation mode M1 in which the supply air and the exhaust air are passed through the total heat exchanger 20, and a normal ventilation mode M2 ​​in which the supply air and / or the exhaust air is not passed through the total heat exchanger 20. In the heat exchange ventilation mode M1, heat exchange is performed between the supply air and the exhaust air, and in the normal ventilation mode M2, heat exchange is not performed between the supply air and the exhaust air. When the mode selection unit 327 selects the heat exchange ventilation mode M1, the determination unit 323 determines that the air volume W of the ventilation device 1 should not be increased. When the mode selection unit 327 selects the normal ventilation mode M2, the determination unit 323 determines whether to increase the air volume W of the ventilation device 1 based on the indoor temperature TJ, the outdoor temperature TQ, and the comfort temperature TB acquired by the second acquisition unit 321. The determination unit 323 determines to increase the air volume W of the ventilation device 1, for example, when the comfort temperature TB and the outdoor temperature TQ are lower than the indoor temperature TJ, and when the comfort temperature TB and the outdoor temperature TQ are higher than the indoor temperature TJ.

[0058] When the ventilation device 1 includes multiple ventilation devices 1, the device selection unit 328 selects a ventilation device 1 to perform ventilation operation from among the multiple ventilation devices 1 based on the carbon dioxide concentration CC at the positions corresponding to each of the multiple ventilation devices 1. For example, the multiple ventilation devices 1 are configured with a first ventilation device 1A and a second ventilation device 1B. The carbon dioxide sensor 4 is configured with a carbon dioxide sensor 4A corresponding to the first ventilation device 1A and a carbon dioxide sensor 4B corresponding to the second ventilation device 1B. For example, when the carbon dioxide concentration CC detected by the carbon dioxide sensor 4A is higher than the carbon dioxide concentration CC detected by the carbon dioxide sensor 4B, the device selection unit 328 selects the first ventilation device 1A as the ventilation device 1 that will perform the ventilation operation. For example, when the carbon dioxide concentration CC detected by the carbon dioxide sensor 4B is higher than the carbon dioxide concentration CC detected by the carbon dioxide sensor 4A, the device selection unit 328 selects the second ventilation device 1B as the ventilation device 1 that will perform the ventilation operation. If the ventilation volume is insufficient with one ventilation device for the first air volume W1, the ventilation device linked to the sensor with the second highest carbon dioxide concentration is controlled to the required air volume.

[0059] [1-4. Processing of the judgment section] Next, the process of the determination unit 323 will be further described mainly with reference to Fig. 6. Note that in Fig. 6, a case in which the ventilation device 1 has a total heat exchanger 20 will be described. Fig. 6 is a table showing an example of the determination process executed by the determination unit 323 of the server device 3. Fig. 6 is also a table showing an example of the relationship between the comfort temperature TB, the outside air temperature TQ, and the room temperature TJ and the upper limit airflow WM in this embodiment. The setting table TBL shown in Fig. 6 is stored in advance in the second data storage unit 332. The determination unit 323, for example, refers to the setting table TBL to determine whether or not to increase the air volume W of the ventilation device 1.

[0060] In the setting table TBL shown in FIG. 6, from the left column to the right column, a condition CD, a temperature relationship RT, an upper limit airflow rate WM, and an operation mode MP are written. The temperature relationship RT indicates the magnitude relationship among the comfort temperature TB, the outside temperature TQ, and the room temperature TJ. Furthermore, the upper limit airflow rate WM indicates the upper limit of the second airflow rate W2.

[0061] The second setting unit 324 then references the setting table TBL to set the second airflow rate W2. The mode selection unit 327 also references the setting table TBL to switch between the heat exchange ventilation mode M1 and the normal ventilation mode M2.

[0062] For example, when the condition CD is the condition A, the temperature relationship RT satisfies the following formula (3). T.J. <TQ=TB (3) In this case, the upper limit airflow WM is the maximum airflow WE. Furthermore, the mode selection unit 327 sets the normal ventilation mode M2 ​​as the operation mode.

[0063] In condition A, as shown in equation (3), the outdoor temperature TQ coincides with the comfort temperature TB, and the room temperature TJ is lower than the outdoor temperature TQ and the comfort temperature TB. In this case, by increasing the airflow W and letting a large amount of outside air flow into the room, the room temperature TJ can be brought closer to the comfort temperature TB. Therefore, the determination unit 323 determines to increase the airflow W of the ventilator 1, and the second setting unit 324 sets the maximum airflow WE as the second airflow W2. In this way, by increasing the air volume W of the ventilation device 1, the room temperature TJ can be brought closer to the comfort temperature TB, so the mode selection unit 327 sets the normal ventilation mode M2 ​​as the operation mode.

[0064] Furthermore, for example, when the condition CD is the condition B, the temperature relationship RT satisfies the following formula (4). TQ=TB <TJ (4) In this case, the upper limit airflow WM is the maximum airflow WE. Furthermore, the mode selection unit 327 sets the normal ventilation mode M2 ​​as the operation mode.

[0065] In condition B, as shown in equation (4), the outdoor temperature TQ coincides with the comfort temperature TB, and the room temperature TJ is higher than the outdoor temperature TQ and the comfort temperature TB. In this case, by increasing the airflow rate W and letting a large amount of outside air flow into the room, the room temperature TJ can be brought closer to the comfort temperature TB. Therefore, the determination unit 323 determines to increase the airflow rate W of the ventilator 1, and the second setting unit 324 sets, for example, the maximum airflow rate WE as the second airflow rate W2. In this way, by increasing the air volume W of the ventilation device 1, the room temperature TJ can be brought closer to the comfort temperature TB, so the mode selection unit 327 sets the normal ventilation mode M2 ​​as the operation mode.

[0066] Furthermore, for example, when the condition CD is the condition C, the temperature relationship RT satisfies the following formula (5). T.J. <TB<TQ (5) In this case, the upper limit airflow WM is the large airflow WD. Furthermore, the mode selection unit 327 sets the normal ventilation mode M2 ​​as the operation mode.

[0067] In condition C, as shown in equation (5), the outside air temperature TQ is higher than the comfort temperature TB, and the room temperature TJ is lower than the comfort temperature TB. In this case, the indoor temperature TJ can be brought closer to the comfort temperature TB by increasing the airflow W and letting outside air flow into the room. However, if a large amount of outside air is allowed to flow into the room, the indoor temperature TJ may approach the outside air temperature TQ and become higher than the comfort temperature TB. Therefore, the determination unit 323 determines to increase the airflow W of the ventilator 1, and the second setting unit 324 sets the second airflow W2 to, for example, a large airflow WD. In this way, by increasing the air volume W of the ventilation device 1, the room temperature TJ can be brought closer to the comfort temperature TB, so the mode selection unit 327 sets the normal ventilation mode M2 ​​as the operation mode.

[0068] Furthermore, for example, when the condition CD is the condition D, the temperature relationship RT satisfies the following formula (6). TQ <TB<TJ (6) In this case, the upper limit airflow WM is the large airflow WD. Furthermore, the mode selection unit 327 sets the normal ventilation mode M2 ​​as the operation mode.

[0069] In condition D, as shown in equation (6), the outdoor temperature TQ is lower than the comfort temperature TB, and the indoor temperature TJ is higher than the comfort temperature TB. In this case, the indoor temperature TJ can be brought closer to the comfort temperature TB by increasing the airflow W and letting outside air into the room. However, if a large amount of outside air is allowed to flow into the room, the indoor temperature TJ may approach the outside air temperature TQ and become lower than the comfort temperature TB. Therefore, the determination unit 323 determines to increase the airflow W of the ventilator 1, and the second setting unit 324 sets, for example, a large airflow WD as the second airflow W2. In this way, by increasing the air volume W of the ventilation device 1, the room temperature TJ can be brought closer to the comfort temperature TB, so the mode selection unit 327 sets the normal ventilation mode M2 ​​as the operation mode.

[0070] Furthermore, for example, when the condition CD is the condition E, the temperature relationship RT satisfies the following formula (7). TB <TQ<TJ (7) In this case, the upper limit airflow WM is the medium airflow WC. Furthermore, the mode selection unit 327 sets the heat exchange ventilation mode M1 as the operation mode.

[0071] In condition E, as shown in equation (7), the outdoor temperature TQ is higher than the comfort temperature TB, and the room temperature TJ is higher than the outdoor temperature TQ. In this case, the indoor temperature TJ can be brought closer to the comfort temperature TB by increasing the airflow W and letting the outside air into the room. However, if a large amount of outside air is allowed to flow into the room, the condition in which the indoor temperature TJ is higher than the comfort temperature TB is not resolved, although the indoor temperature TJ approaches the comfort temperature TB. In other words, by increasing the air volume W, the temperature relationship shown in equation (7) approaches the temperature relationship shown in equation (7)' below. TB <TQ=TJ (7)’ In this way, the indoor temperature TJ cannot be brought sufficiently close to the comfort temperature TB simply by increasing the air volume W of the ventilation device 1. In this state, it is assumed that the user feels uncomfortable with the warm / cold sensation in the room and operates the air conditioner in cooling mode, so the mode selection unit 327 sets the heat exchange ventilation mode M1 as the operation mode. When the air conditioner operates in cooling mode, the indoor temperature TJ is lowered by cooling due to the cooling operation, while the outdoor air temperature TQ remains higher than the comfort temperature TB. Therefore, by setting the total heat exchanger 20 to the heat exchange ventilation mode M1, the influence of the outdoor air temperature TQ on the indoor temperature TJ cooled by the air conditioner can be suppressed. In other words, by setting the heat exchange ventilation mode M1, the rise in the indoor temperature TJ due to the outdoor air temperature TQ can be suppressed, so the operation mode MP in FIG. 6 is described as "heat exchange (cooling)" for convenience.

[0072] Furthermore, for example, when the condition CD is the condition F, the temperature relationship RT satisfies the following formula (8). T.J. <TQ<TB (8) In this case, the upper limit airflow WM is the medium airflow WC. Furthermore, the mode selection unit 327 sets the heat exchange ventilation mode M1 as the operation mode.

[0073] In condition F, as shown in equation (8), the outdoor temperature TQ is lower than the comfort temperature TB, and the room temperature TJ is lower than the outdoor temperature TQ. In this case, the indoor temperature TJ can be brought closer to the comfort temperature TB by increasing the airflow W and letting the outside air into the room. However, if a large amount of outside air is allowed to flow into the room, the condition in which the indoor temperature TJ is lower than the comfort temperature TB is not resolved, although the indoor temperature TJ approaches the comfort temperature TB. In other words, by increasing the air volume W, the temperature relationship shown in equation (8) approaches the temperature relationship shown in equation (8)' below. TJ=TQ <TB (8)’ In this way, the indoor temperature TJ cannot be brought sufficiently close to the comfort temperature TB simply by increasing the air volume W of the ventilation device 1. In this state, it is assumed that the user feels uncomfortable with the warm / cold sensation in the room and operates the air conditioner in heating mode, so the mode selection unit 327 sets the heat exchange ventilation mode M1 as the operation mode. When the air conditioner operates in heating mode, the indoor temperature TJ increases due to heating in the heating operation, while the outdoor air temperature TQ remains lower than the comfort temperature TB. Therefore, by setting the total heat exchanger 20 to the heat exchange ventilation mode M1, the influence of the outdoor air temperature TQ on the indoor temperature TJ heated by the air conditioner can be suppressed. In other words, by setting the heat exchange ventilation mode M1, the drop in the indoor temperature TJ due to the outdoor air temperature TQ can be suppressed, so the operation mode MP in FIG. 6 is described as "heat exchange (heating)" for convenience.

[0074] Furthermore, for example, when the condition CD is the condition K, the temperature relationship RT satisfies the following formula (9). TQ <TJ<TB (9) In this case, the upper limit airflow WM is the minimum airflow WA. Furthermore, the mode selection unit 327 sets the heat exchange ventilation mode M1 as the operation mode.

[0075] In condition K, as shown in equation (9), the outside air temperature TQ is lower than the indoor temperature TJ, and the indoor temperature TJ is lower than the comfort temperature TB. In this case, if the airflow rate W is increased, the indoor temperature TJ will become even lower than the comfortable temperature TB. Therefore, the determination unit 323 determines not to increase the airflow rate W of the ventilation device 1, and the second setting unit 324 sets, for example, the minimum airflow rate WA as the second airflow rate W2. In this way, the indoor temperature TJ cannot be brought sufficiently close to the comfort temperature TB simply by not increasing the air volume W of the ventilation device 1. In this state, it is assumed that the user feels uncomfortable with the warm / cold sensation in the room and operates the air conditioner in heating mode, so the mode selection unit 327 sets the heat exchange ventilation mode M1 as the operation mode. When the air conditioner operates in heating mode, the indoor temperature TJ increases due to heating in the heating operation, while the outdoor air temperature TQ remains lower than the comfort temperature TB. Therefore, by setting the total heat exchanger 20 to the heat exchange ventilation mode M1, the influence of the outdoor air temperature TQ on the indoor temperature TJ heated by the air conditioner can be suppressed. In other words, by setting the heat exchange ventilation mode M1, the drop in the indoor temperature TJ due to the outdoor air temperature TQ can be suppressed, so the operation mode MP in FIG. 6 is described as "heat exchange (heating)" for convenience.

[0076] Furthermore, for example, when the condition CD is the condition M, the temperature relationship RT satisfies the following formula (10). TB <TJ<TQ (10) In this case, the upper limit airflow WM is the minimum airflow WA. Furthermore, the mode selection unit 327 sets the heat exchange ventilation mode M1 as the operation mode.

[0077] In condition M, as shown in equation (10), the indoor temperature TJ is higher than the comfort temperature TB, and the outdoor temperature TQ is lower than the indoor temperature TJ. In this case, increasing the airflow rate W would cause the room temperature TJ to become even higher than the comfortable temperature TB. Therefore, the determination unit 323 determines not to increase the airflow rate W of the ventilation device 1, and the second setting unit 324 sets, for example, the minimum airflow rate WA as the second airflow rate W2. In this way, the indoor temperature TJ cannot be brought sufficiently close to the comfort temperature TB simply by not increasing the air volume W of the ventilation device 1. In this state, it is assumed that the user feels uncomfortable with the warmth and coldness of the room and operates the air conditioner in cooling mode, so the mode selection unit 327 sets the heat exchange ventilation mode M1 as the operation mode. When the air conditioner operates in cooling mode, the indoor temperature TJ is lowered by cooling due to the cooling operation, while the outdoor air temperature TQ remains higher than the comfort temperature TB. Therefore, by setting the total heat exchanger 20 to the heat exchange ventilation mode M1, the influence of the outdoor air temperature TQ on the indoor temperature TJ cooled by the air conditioner can be suppressed. In other words, by setting the heat exchange ventilation mode M1, the rise in the indoor temperature TJ due to the outdoor air temperature TQ can be suppressed, so the operation mode MP in FIG. 6 is described as "heat exchange (cooling)" for convenience.

[0078] [1-5. Processing of server equipment] Next, the process of the second control unit 31 of the server device 3 will be described. FIG. 7 is a flowchart showing an example of a process executed by the second control unit 31 of the server device 3. First, in step S101, the second obtainer 321 sets a comfortable temperature TB based on a comfort index. Next, in step S103, the second acquisition unit 321 acquires the carbon dioxide concentration CC from the carbon dioxide sensor 4. Next, in step S105, the first setting unit 322 sets the first air volume W1 of the ventilation device 1 based on the carbon dioxide concentration CC acquired in step S103.

[0079] Next, in step S107, the second acquisition unit 321 acquires the room temperature TJ from the inside air temperature sensor 5. The second acquisition unit 321 also acquires the outside air temperature TQ from the outside air temperature sensor 6. Next, in step S109, the determination unit 323 determines whether or not to increase the air volume W of the ventilation device 1, based on the room temperature TJ and the outdoor temperature TQ acquired by the second acquisition unit 321, and the comfort temperature TB. The determination unit 323 determines whether or not to increase the air volume W of the ventilation device 1, for example, by referring to the setting table TBL shown in Fig. 6. The determination unit 323 also executes a "determination process" which will be described with reference to Fig. 8. Here, the "determination process" refers to a process which determines whether or not to increase the air volume W of the ventilation device 1, based on the room temperature TJ, the outdoor temperature TQ, and the comfort temperature TB.

[0080] Next, in step S111, second control unit 31 determines whether or not determination unit 323 has determined in step S109 that the air volume W should be increased. When the second control unit 31 determines that the determination unit 323 has determined that the air volume W should not be increased (step S111; NO), the process proceeds to step S117. When the second control unit 31 determines that the determination unit 323 has determined that the air volume W should be increased (step S111; YES), the process proceeds to step S113.

[0081] Then, in step S113, the second setting unit 324 increases the first air volume W1 to the second air volume W2. The second air volume W2 is set, for example, by referring to the setting table TBL shown in FIG. Next, in step S115, the instructing unit 325 instructs the ventilation device 1 to adjust the air volume W to the second air volume W2 set in step S113.

[0082] Next, in step S117, the second control unit 31 determines whether or not a predetermined period of time PP has elapsed since the start of the process in step S101. If the second control unit 31 determines that the predetermined period PP has elapsed (step S117; YES), the process returns to step S101. If the second control unit 31 determines that the predetermined period PP has not elapsed (step S117; NO), the process goes into a standby state.

[0083] Step S105 corresponds to an example of the "first setting step". Step S109 corresponds to an example of the "judgment step". Step S113 corresponds to an example of the "second setting step". Step S115 corresponds to an example of the "execution step".

[0084] Next, with reference to FIG. 8, the determination process will be described. FIG. 8 is a flowchart showing an example of the determination process executed by the second control unit 31 of the server device 3. The determination process shown in FIG. 8 is executed in step S109 of the flowchart shown in FIG. 7. First, in step S201, the determination unit 323 determines whether the following formula (11) or formula (12) is satisfied. TB < TJ and TQ < TJ (11) TB > TJ and TQ > TJ (12) If the determination unit 323 determines that the formula (11) or formula (12) is satisfied (step S201; YES), the process proceeds to step S211. Then, in step S211, the determination unit 323 determines to increase the air volume W of the ventilation device 1. Thereafter, the process returns to step S111 of FIG. 7.

[0085] If the determination unit 323 determines that the formula (11) or formula (12) is not satisfied (step S201; NO), the process proceeds to step S203. Then, in step S203, the determination unit 323 determines whether the following formula (13) or formula (14) is satisfied. When the formula (13) or formula (14) is satisfied, in other words, when the comfortable temperature TB is between the indoor temperature TJ and the outside air temperature TQ. TJ < TB < TQ (13) TQ < TB < TJ (14) If the determination unit 323 determines that the formula (13) or formula (14) is not satisfied (step S203; NO), the process proceeds to step S207. If the determination unit 323 determines that the formula (13) or formula (14) is satisfied (step S203; YES), the process proceeds to step S205.

[0086] Then, in step S205, the determination unit 323 determines whether the following formula (15) is satisfied. |TJ-TB|>|TQ-TB| (15) The case where the formula (15) is satisfied is, in other words, the case where the comfort temperature TB is closer to the outside air temperature TQ than to the room temperature TJ. If the determination unit 323 determines that the formula (15) is satisfied (step S205; YES), the process proceeds to step S211. Then, in step S211, the determination unit 323 determines to increase the air volume W of the ventilation device 1. After that, the process returns to step S111 in FIG.

[0087] If the determination unit 323 determines that the formula (15) is not satisfied (step S205; NO), the process proceeds to step S213. If NO in step S203, in step S207, the determination unit 323 determines whether the following formula (16) or (17) is satisfied. T.J. <TQ<TB (16) TB <TQ<TJ (17) The case where formula (16) or formula (17) is satisfied is, in other words, the case where the outside air temperature TQ is between the room temperature TJ and the comfort temperature TB. If the determination unit 323 determines that the formula (16) or the formula (17) is not satisfied (step S207; NO), the process proceeds to step S213. Then, in step S213, the determination unit 323 determines not to increase the air volume W of the ventilation device 1. In other words, the determination unit 323 determines to maintain the air volume W at the first air volume W1. Then, the process returns to step S111 in FIG.

[0088] If the determination unit 323 determines that the formula (16) or the formula (17) is satisfied (step S207; YES), the process proceeds to step S209. Then, in step S209, the determination unit 323 determines whether the following formula (18) is satisfied. |TJ-TQ|>|TQ-TB| (18) The case where equation (18) is satisfied is, in other words, the case where the outside air temperature TQ is closer to the comfort temperature TB than the room temperature TJ. If the determination unit 323 determines that the formula (18) is not satisfied (step S209; NO), the process proceeds to step S213. Then, in step S213, the determination unit 323 determines not to increase the air volume W of the ventilation device 1. In other words, the determination unit 323 determines to maintain the air volume W at the first air volume W1. Then, the process returns to step S111 in FIG. If the determination unit 323 determines that the formula (18) is satisfied (step S209; YES), the process proceeds to step S211. Then, in step S211, the determination unit 323 determines to increase the air volume W. After that, the process returns to step S111 in FIG.

[0089] [2. Effects, etc.] As described above, the control method for the ventilation device 1 configured to adjust the air volume W includes a first setting step of setting a first air volume W1 of the ventilation device 1 based on the concentration of substances harmful to the human body in the space S ventilated by the ventilation device 1, a determination step of determining whether or not to increase the air volume W, and a second setting step of increasing the first air volume W1 to a second air volume W2 if it is determined in the determination step that the air volume W should be increased. In the determination step, it is determined that the air volume W should be increased if the comfort temperature TB and the outdoor air temperature TQ of a user P present in the space S are lower than the indoor temperature TJ, and if the comfort temperature TB and the outdoor air temperature TQ are higher than the indoor temperature TJ.

[0090] According to this, the first air volume W1 of the ventilation device 1 is set based on the concentration of substances harmful to the human body in the space S. This ensures the safety of the user P. Also, when the comfort temperature TB and the outdoor air temperature TQ of the user P in the space S are lower than the room temperature TJ, and when the comfort temperature TB and the outdoor air temperature TQ are higher than the room temperature TJ, it is determined that the air volume W should be increased. Thus, by increasing the air volume W, the room temperature TJ can be brought closer to the comfort temperature TB. Therefore, the air volume W can be adjusted to achieve both the safety and comfort of the user P.

[0091] In the method for controlling the ventilation device 1, the first air volume W1 is a necessary and minimum air volume corresponding to the concentration of substances harmful to the human body.

[0092] According to this, since the first air volume W1 is a necessary and minimum air volume corresponding to the concentration of substances harmful to the human body, the first air volume W1 can be set appropriately, and therefore the safety of the user P can be ensured.

[0093] In the method for controlling the ventilation device 1, the substances harmful to the human body include at least one of carbon dioxide, PM2.5, viruses, and mites.

[0094] According to this, when the substance harmful to the human body is, for example, carbon dioxide, the first air volume W1 is set based on the carbon dioxide concentration CC, so that the first air volume W1 can be set appropriately. Also, when the substance harmful to the human body is, for example, PM2.5, the first air volume W1 is set based on the concentration of PM2.5, so that the first air volume W1 can be set appropriately.

[0095] In the control method for the ventilation device 1, in the judgment step, when the comfort temperature TB is between the indoor temperature TJ and the outdoor temperature TQ, if the comfort temperature TB is closer to the outdoor temperature TQ than the indoor temperature TJ, it is judged that the air volume W should be increased, and if the comfort temperature TB is closer to the indoor temperature TJ than the outdoor temperature TQ, it is judged that the air volume W should not be increased.

[0096] According to this, when the comfort temperature TB is between the indoor temperature TJ and the outdoor temperature TQ, if the comfort temperature TB is closer to the outdoor temperature TQ than the indoor temperature TJ, it is determined that the air volume W should be increased. By increasing the air volume W, the indoor temperature TJ can be brought closer to the comfort temperature TB. Therefore, the air volume W can be adjusted so as to improve the comfort of the user P. Also, when the comfort temperature TB is between the indoor temperature TJ and the outdoor temperature TQ, if the comfort temperature TB is closer to the indoor temperature TJ than the outdoor temperature TQ, it is determined that the air volume W should not be increased. By not increasing the air volume W, it is possible to prevent the indoor temperature TJ from moving away from the comfort temperature TB. Therefore, the air volume W can be adjusted so as to improve the comfort of the user P.

[0097] In the control method for the ventilation device 1, in the judgment step, when the outside air temperature TQ is between the indoor temperature TJ and the comfort temperature TB, if the outside air temperature TQ is closer to the comfort temperature TB than the indoor temperature TJ, it is judged that the air volume W should be increased, and if the outside air temperature TQ is closer to the indoor temperature TJ than the comfort temperature TB, it is judged that the air volume W should not be increased.

[0098] According to this, when the outside air temperature TQ is between the indoor temperature TJ and the comfort temperature TB, if the outside air temperature TQ is closer to the comfort temperature TB than the indoor temperature TJ, it is determined that the air volume W should be increased. By increasing the air volume W, the indoor temperature TJ can be brought closer to the comfort temperature TB. Therefore, the air volume W can be adjusted to improve the comfort of the user P. When the outside air temperature TQ is between the indoor temperature TJ and the comfort temperature TB, if the outside air temperature TQ is closer to the indoor temperature TJ than the comfort temperature TB, it is determined that the air volume W should not be increased. By not increasing the air volume W, it is possible to prevent the indoor temperature TJ from moving away from the comfort temperature TB. Therefore, the air volume W can be adjusted to improve the comfort of the user P.

[0099] In the method for controlling the ventilation device 1, the comfort temperature TB is calculated based on a comfort index.

[0100] According to this, since the comfort temperature TB is calculated based on the comfort index, the comfort temperature TB can be calculated appropriately. Therefore, the airflow rate W can be adjusted so as to improve the comfort of the user P.

[0101] In the control method for the ventilation device 1, the ventilation device 1 is equipped with a total heat exchanger 20, and further includes a mode selection step of switching the operating mode of the ventilation device 1 between a heat exchange ventilation mode M1 in which the total heat exchanger 20 is operated and a normal ventilation mode M2 ​​in which the total heat exchanger 20 is not operated, and if the heat exchange ventilation mode M1 is selected in the mode selection step, it is determined in the judgment step that the air volume W will not be increased, and if the normal ventilation mode M2 ​​is selected in the mode selection step, it is determined in the judgment step that the air volume W will be increased if the comfort temperature TB and the outdoor air temperature TQ are lower than the indoor temperature TJ, and if the comfort temperature TB and the outdoor air temperature TQ are higher than the indoor temperature TJ.

[0102] According to this, when the heat exchange ventilation mode M1 is selected in the mode selection step, it is determined in the determination step that the air volume W should not be increased, so that the indoor temperature TJ can be appropriately controlled by the total heat exchanger 20. Also, when the normal ventilation mode M2 ​​is selected in the mode selection step, it is determined in the determination step that the air volume W should be increased when the comfort temperature TB and the outdoor air temperature TQ are lower than the indoor temperature TJ, and when the comfort temperature TB and the outdoor air temperature TQ are higher than the indoor temperature TJ. Thus, by increasing the air volume W, the indoor temperature TJ can be brought closer to the comfort temperature TB. Therefore, the air volume W can be adjusted to improve the comfort of the user P.

[0103] In the control method for the ventilation device 1, the ventilation device 1 includes a plurality of ventilation devices 1, the concentration of the substance harmful to the human body is the concentration of the substance harmful to the human body at a position corresponding to each of the plurality of ventilation devices 1, and the method further includes an apparatus selection step of selecting a ventilation device 1 that will perform ventilation operation from among the plurality of ventilation devices based on the concentration of the substance harmful to the human body at a position corresponding to each of the plurality of ventilation devices 1.

[0104] According to this, a ventilation device 1 that performs a ventilation operation is selected from the multiple ventilation devices based on the concentration of the substance harmful to the human body at a position corresponding to each of the multiple ventilation devices 1. For example, the ventilation device 1 with the higher concentration of the substance harmful to the human body is selected as the ventilation device 1 that performs the ventilation operation. Therefore, the safety of the user P can be ensured.

[0105] The control method for the ventilation device 1 further includes an execution step of performing ventilation at a first air volume W1 or a second air volume W2, and the first setting step, the determination step, the second setting step, and the execution step are repeatedly performed for each predetermined period PP, and the first setting step includes determining the first air volume W1 for the next predetermined period PP based on the carbon dioxide concentration CC for the current predetermined period PP, and the determination step determines that the air volume W for the next predetermined period PP will be increased when, at least, the comfort temperature TB and the outdoor air temperature TQ are lower than the indoor temperature TJ and when, at least, the comfort temperature TB and the outdoor air temperature TQ are higher than the indoor temperature TJ during the current predetermined period PP.

[0106] According to this, the method further includes an execution step of performing ventilation at the first air volume W1 or the second air volume W2, and the first setting step, the determination step, the second setting step, and the execution step are repeatedly performed for each predetermined period PP, so that the air volume W of the ventilation device 1 can be appropriately controlled. Moreover, the determination step determines that the air volume W in the next predetermined period PP should be increased when at least the comfort temperature TB and the outdoor temperature TQ are lower than the room temperature TJ and when the comfort temperature TB and the outdoor temperature TQ are higher than the room temperature TJ in the current predetermined period PP. Thus, by increasing the air volume W, the room temperature TJ can be brought closer to the comfort temperature TB. Therefore, the air volume W can be adjusted to improve the comfort of the user P.

[0107] Also, there is provided a control method for the ventilation device 1 for adjusting the air volume W based on the concentration of a substance harmful to the human body in the space S ventilated by the ventilation device 1, and when the concentration of the substance harmful to the human body is a first concentration, the air volume W is adjusted so that a third air volume, which is the air volume W when the comfort temperature TB and the outside air temperature TQ are lower than the indoor temperature TJ, or when the comfort temperature TB and the outside air temperature TQ are higher than the indoor temperature TJ, is greater than a fourth air volume, which is the air volume when the indoor temperature TJ is between the comfort temperature TB and the outside air temperature TQ.

[0108] According to this, when the concentration of a substance harmful to the human body is a first concentration, the third airflow rate, which is the airflow rate W when the comfort temperature TB and the outside air temperature TQ are lower than the indoor temperature TJ, or when the comfort temperature TB and the outside air temperature TQ are higher than the indoor temperature TJ, is adjusted to be larger than the fourth airflow rate, which is the airflow rate when the indoor temperature TJ is between the comfort temperature TB and the outside air temperature TQ. Thus, since the airflow rate W is adjusted to make the third airflow larger than the fourth airflow, the indoor temperature TJ can be brought closer to the comfort temperature TB. Therefore, the airflow rate W can be adjusted to improve the comfort of the user P.

[0109] Furthermore, in the control method for the ventilation device 1, when the comfort temperature TB is between the indoor temperature TJ and the outdoor air temperature TQ, and the concentration of the substance harmful to the human body is a second concentration, the air volume W is adjusted so that a fifth air volume W, which is the air volume W when the comfort temperature TB is closer to the outdoor air temperature TQ than the indoor temperature TJ, is larger than a sixth air volume W, which is the air volume W when the comfort temperature TB is closer to the indoor temperature TJ than the outdoor air temperature TQ.

[0110] According to this, when the comfort temperature TB is between the indoor temperature TJ and the outdoor temperature TQ, and the concentration of the substance harmful to the human body is the second concentration, the air volume W is adjusted so that the fifth air volume W, which is the air volume W when the comfort temperature TB is closer to the outdoor temperature TQ than the indoor temperature TJ, is larger than the sixth air volume W, which is the air volume W when the comfort temperature TB is closer to the indoor temperature TJ than the outdoor temperature TQ. Thus, since the air volume W is adjusted so that the fifth air volume is larger than the sixth air volume, the indoor temperature TJ can be brought closer to the comfort temperature TB. Therefore, the air volume W can be adjusted to improve the comfort of the user P.

[0111] In the control method for the ventilation device 1, when the comfort temperature TB is between the indoor temperature TJ and the outdoor air temperature TQ, and the concentration of the substance harmful to the human body is a third concentration, the air volume W is adjusted so that a seventh air volume, which is the air volume when the outdoor air temperature TQ is closer to the comfort temperature TB than the indoor temperature TJ, is larger than an eighth air volume, which is the air volume when the outdoor air temperature TQ is closer to the indoor temperature TJ than the comfort temperature TB.

[0112] According to this, when the comfort temperature TB is between the indoor temperature TJ and the outdoor air temperature TQ, and the concentration of the substance harmful to the human body is the third concentration, the air volume W is adjusted so that the seventh air volume, which is the air volume when the outdoor air temperature TQ is closer to the comfort temperature TB than the indoor temperature TJ, is larger than the eighth air volume, which is the air volume when the outdoor air temperature TQ is closer to the indoor temperature TJ than the comfort temperature TB. Therefore, since the air volume W is adjusted so that the seventh air volume is larger than the eighth air volume, it is possible to bring the indoor temperature TJ closer to the comfort temperature TB. Therefore, it is possible to adjust the air volume W so as to improve the comfort of the user P.

[0113] Also, the server device 3 controls the ventilation device 1 configured to be able to adjust the air volume W, and includes a first setting unit 322 that sets a first air volume W1 of the ventilation device 1 based on the concentration of substances harmful to the human body in the space S ventilated by the ventilation device 1, a judgment unit 323 that judges whether to increase the air volume W, and a second setting unit 324 that increases the first air volume W1 to a second air volume W2 when the judgment unit 323 judges that the air volume W should be increased, and the judgment unit 323 judges that the air volume W should be increased when the comfort temperature TB of a user P present in the space S and the outdoor air temperature TQ are lower than the indoor temperature TJ, and when the comfort temperature TB and the outdoor air temperature TQ are higher than the indoor temperature TJ. Control device.

[0114] According to this, the same effects as those of the control method for the ventilation device 1 described above can be achieved.

[0115] The second control program 331 is a second control program 331 of the server device 3 that controls the ventilation device 1 configured to be able to adjust the air volume W, and causes the second processor 32 to function as a first setting unit 322 that sets a first air volume W1 of the ventilation device 1 based on the concentration of substances harmful to the human body in the space S ventilated by the ventilation device 1, a judgment unit 323 that judges whether to increase the air volume W, and a second setting unit 324 that increases the first air volume W1 to a second air volume W2 when the judgment unit 323 judges that the air volume W should be increased, and the judgment unit 323 judges to increase the air volume W when the comfort temperature TB and the outdoor air temperature TQ of a user P present in the space S are lower than the indoor temperature TJ, and when the comfort temperature TB and the outdoor air temperature TQ are higher than the indoor temperature TJ.

[0116] According to this, the same effects as those of the control method for the ventilation device 1 described above can be achieved.

[0117] (Other embodiments) As described above, the above embodiment has been described as an example disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. In addition, it is also possible to combine the components described in the above embodiment to form a new embodiment. Therefore, other embodiments will be exemplified below.

[0118] In the above-described embodiment, the case where the "control device" is configured by the server device 3 has been described, but the present disclosure is not limited to this. The "control device" may be configured by, for example, a centralized management device for a building, a controller such as a remote control, a personal computer, a tablet terminal, a smartphone, or the like. The "control device" may also be configured by, for example, the first control unit 24.

[0119] In the above-described embodiment, the case where the ventilation device 1 communicates with the server device 3 via the communication device 2 has been described, but the present disclosure is not limited to this. The ventilation device 1 may include, for example, the communication device 2. In other words, the communication device 2 may be configured integrally with the ventilation device 1.

[0120] In the above-described embodiment, the ventilation device 1 is mainly described as including the total heat exchanger 20, but the present invention is not limited to this. The ventilation device 1 does not necessarily have to include the total heat exchanger 20. In addition, in the above-described embodiment, the case where there is one ventilation device 1 has been described, but the present invention is not limited to this. The ventilation device 1 may include a plurality of ventilation devices.

[0121] In the above-described embodiment, the ventilation device 1 can adjust the air volume W in, for example, five stages, but is not limited thereto. The ventilation device 1 may be capable of adjusting the air volume W. For example, the ventilation device 1 may be capable of adjusting the air volume W in, for example, any of two stages to four stages. Furthermore, for example, the ventilation device 1 may be capable of adjusting the air volume W in six or more stages. Furthermore, for example, the ventilation device 1 may be capable of adjusting the air volume W steplessly, in other words, continuously.

[0122] In the above-described embodiment, the case where the "substances harmful to the human body" are carbon dioxide will be described, but the "substances harmful to the human body" are not limited to carbon dioxide. The "substances harmful to the human body" may be, for example, PM2.5. The "substances harmful to the human body" may be, for example, viruses. The "substances harmful to the human body" may be, for example, mites. In the above-described embodiment, when the ventilation device 1 includes a plurality of ventilation devices 1, the device selection unit 328 is configured to select a ventilation device 1 that performs a ventilation operation from among the plurality of ventilation devices 1 based on the carbon dioxide concentration CC at a position corresponding to each of the plurality of ventilation devices 1, but the present invention is not limited to this. It is also possible to cause each ventilation device to perform a ventilation operation based on the detection result of a carbon dioxide sensor provided in the ventilation device, without selecting a ventilation device 1 that performs a ventilation operation.

[0123] Each of the first processor 14A and the second processor 32 may be composed of a single processor or multiple processors. These processors may be hardware programmed to realize the corresponding functional units. That is, these processors may be composed of, for example, an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

[0124] The configurations of the ventilation device 1 and the server device 3 shown in Figures 4 and 5 are merely examples, and the specific implementation form is not particularly limited. In other words, it is not necessarily necessary to implement hardware corresponding to each unit individually, and it is also possible to implement a configuration in which one processor executes a program to realize the functions of each unit. Also, some of the functions realized by software in the above-mentioned embodiment may be hardware, or some of the functions realized by hardware may be software.

[0125] The step units of the process shown in Figures 7 and 8 are divided according to the main process contents in order to facilitate understanding of the operation, and the process is not limited by the way in which the process units are divided or the names of the process units. The process may be divided into more step units according to the process contents. Also, one step unit may be divided so as to include more processes. Also, the order of the steps may be changed as appropriate within the scope of the present disclosure.

[0126] It should be noted that the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims or their equivalents.

[0127] (Additional Note) The above description of the embodiments discloses the following techniques.

[0128] (Technology 1) A control method for a ventilation device configured to be able to adjust airflow, the control method for a ventilation device including: a first setting step of setting a first airflow rate of the ventilation device based on a concentration of a substance harmful to the human body in a space ventilated by the ventilation device; a determination step of determining whether or not to increase the airflow rate; and a second setting step of increasing the first airflow rate to a second airflow rate when it is determined in the determination step that the airflow rate should be increased, wherein in the determination step, it is determined that the airflow rate should be increased when a comfort temperature of a user present in the space and an outdoor air temperature are lower than an indoor temperature ventilated by the room ventilation device, and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature. According to this, the first air volume of the ventilation device is set based on the concentration of substances harmful to the human body in the space ventilated by the ventilation device 1. Thus, the safety of the user can be ensured. Also, when the comfort temperature of the user in the space ventilated by the ventilation device 1 and the outdoor air temperature are lower than the indoor temperature, and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature, it is determined that the air volume should be increased. Thus, by increasing the air volume, the indoor temperature can be brought closer to the comfort temperature. Therefore, the air volume can be adjusted to achieve both the safety and comfort of the user.

[0129] (Technology 2) The method for controlling a ventilation device according to Technology 1, wherein the first air volume is a necessary and minimum air volume corresponding to a concentration of the substance harmful to the human body. According to this, since the first airflow rate is a necessary and minimum airflow rate corresponding to the concentration of the substance harmful to the human body, the first airflow rate can be set appropriately, thereby ensuring the safety of the user.

[0130] (Technology 3) The method for controlling a ventilation device according to Technology 1 or Technology 2, wherein the substances harmful to the human body include at least one of carbon dioxide, PM2.5, viruses, and mites. According to this, when the substance harmful to the human body is, for example, carbon dioxide, the first airflow rate is set based on the carbon dioxide concentration CC, so that the first airflow rate can be set appropriately. Also, when the substance harmful to the human body is, for example, PM2.5, the first airflow rate is set based on the concentration of PM2.5, so that the first airflow rate can be set appropriately.

[0131] (Technology 4) The method for controlling a ventilation device according to any one of Technology 1 to Technology 3, wherein in the determination step, when the comfort temperature is between the indoor temperature and the outdoor temperature, it is determined that the airflow rate should be increased if the comfort temperature is closer to the outdoor temperature than the indoor temperature, and it is determined that the airflow rate should not be increased if the comfort temperature is closer to the indoor temperature than the outdoor temperature. According to this, when the comfort temperature is between the indoor temperature and the outdoor temperature, if the comfort temperature is closer to the outdoor temperature than the indoor temperature, it is determined that the air volume should be increased, and by increasing the air volume, the indoor temperature can be brought closer to the comfort temperature. Therefore, the air volume can be adjusted to improve the comfort of the user. Also, when the comfort temperature is between the indoor temperature and the outdoor temperature, if the comfort temperature is closer to the indoor temperature than the outdoor temperature, it is determined that the air volume should not be increased, and by not increasing the air volume, it is possible to prevent the indoor temperature from moving away from the comfort temperature. Therefore, the air volume can be adjusted to improve the comfort of the user.

[0132] (Technology 5) The method for controlling a ventilation device according to any one of Technology 1 to Technology 4, wherein in the determination step, when the outside air temperature is between the indoor temperature and the comfort temperature, if the outside air temperature is closer to the comfort temperature than the indoor temperature, it is determined that the airflow rate should be increased, and when the outside air temperature is closer to the indoor temperature than the comfort temperature, it is determined that the airflow rate should not be increased. According to this, when the outdoor air temperature is between the indoor temperature and the comfort temperature, if the outdoor air temperature is closer to the comfort temperature than the indoor temperature, it is determined that the air volume should be increased, and by increasing the air volume, the indoor temperature can be brought closer to the comfort temperature. Therefore, the air volume can be adjusted to improve the comfort of the user. When the outdoor air temperature is between the indoor temperature and the comfort temperature, if the outdoor air temperature is closer to the indoor temperature than the comfort temperature, it is determined that the air volume should not be increased, and by not increasing the air volume, it is possible to prevent the indoor temperature from moving away from the comfort temperature. Therefore, the air volume can be adjusted to improve the comfort of the user.

[0133] (Technology 6) The method for controlling a ventilation device according to any one of Technology 1 to Technology 5, wherein the comfort temperature is calculated based on a comfort index. According to this, since the comfort temperature is calculated based on the comfort index, the comfort temperature can be calculated appropriately, and the air volume can be adjusted to improve the comfort of the user.

[0134] (Technology 7) The ventilation device is equipped with a heat exchanger, and further includes a mode selection step of switching an operating mode of the ventilation device between a heat exchange ventilation mode in which the heat exchanger is operated and a normal ventilation mode in which the heat exchanger is not operated, and if the heat exchange ventilation mode is selected in the mode selection step, it is determined in the judgment step that the air volume will not be increased, and if the normal ventilation mode is selected in the mode selection step, it is determined in the judgment step that the air volume will be increased if the comfort temperature and the outdoor air temperature are lower than the indoor temperature and if the comfort temperature and the outdoor air temperature are higher than the indoor temperature. According to this, when the heat exchange ventilation mode is selected in the mode selection step, the determination step determines not to increase the air volume, so that the indoor temperature can be appropriately controlled by the heat exchanger. Also, when the normal ventilation mode is selected in the mode selection step, when the comfort temperature and the outdoor temperature are lower than the indoor temperature, and when the comfort temperature and the outdoor temperature are higher than the indoor temperature, the determination step determines to increase the air volume. Thus, by increasing the air volume, the indoor temperature can be brought closer to the comfort temperature. Therefore, the air volume can be adjusted to improve the user's comfort.

[0135] (Technology 8) The method for controlling a ventilation device according to any one of Technology 1 to Technology 7, wherein the ventilation device includes a plurality of ventilation devices, the concentration of the substance harmful to the human body being a concentration of the substance harmful to the human body at a position corresponding to each of the plurality of ventilation devices, and the method further includes a device selection step of selecting a ventilation device that performs ventilation operation from among the plurality of ventilation devices based on the concentration of the substance harmful to the human body at a position corresponding to each of the plurality of ventilation devices. According to this, a ventilation device to perform a ventilation operation is selected from among the plurality of ventilation devices based on the concentration of carbon dioxide at a position corresponding to each of the plurality of ventilation devices. For example, the ventilation device with the higher concentration of carbon dioxide is selected as the ventilation device to perform the ventilation operation. Therefore, the safety of the user can be ensured.

[0136] (Technology 9) A method for controlling a ventilation device according to any one of Technology 1 to Technology 8, further comprising an execution step of performing ventilation at the first airflow rate or the second airflow rate, wherein the first setting step, the determination step, the second setting step, and the execution step are repeatedly performed for each predetermined period, wherein the first setting step includes determining the first airflow rate for the next predetermined period based on a carbon dioxide concentration for the current predetermined period, and the determination step determines to increase the airflow for the next predetermined period at least when, during the current predetermined period, the comfort temperature and the outdoor temperature are lower than the indoor temperature and when the comfort temperature and the outdoor temperature are higher than the indoor temperature. According to this, the method further includes an execution step of performing ventilation at a first air volume or a second air volume, and the first setting step, the determination step, the second setting step, and the execution step are repeatedly performed every predetermined period, so that the air volume of the ventilation device can be appropriately controlled. Moreover, the determination step determines that the air volume in the next predetermined period should be increased when at least the comfort temperature and the outdoor temperature are lower than the indoor temperature and when the comfort temperature and the outdoor temperature are higher than the indoor temperature in the current predetermined period. Thus, by increasing the air volume, the indoor temperature can be brought closer to the comfort temperature. Therefore, the air volume can be adjusted to improve the comfort of the user.

[0137] (Technology 10) A control method for a ventilation device that adjusts the airflow based on the concentration of a substance harmful to the human body in a space ventilated by the ventilation device, the control method adjusting the airflow when the concentration of the substance harmful to the human body is a first concentration, so that a third airflow, which is the airflow when a comfort temperature of a user in the space and the outdoor air temperature are lower than the indoor temperature, or when the comfort temperature and the outdoor air temperature are higher than the indoor temperature, is greater than a fourth airflow, which is the airflow when the indoor temperature is between the comfort temperature and the outdoor air temperature. According to this, when the concentration of a substance harmful to the human body is a first concentration, the third airflow, which is the airflow when the comfort temperature and the outside air temperature are lower than the indoor temperature or when the comfort temperature and the outside air temperature are higher than the indoor temperature, is adjusted to be larger than the fourth airflow, which is the airflow when the indoor temperature is between the comfort temperature and the outside air temperature. Therefore, since the airflow is adjusted to make the third airflow larger than the fourth airflow, the indoor temperature can be brought closer to the comfort temperature. Therefore, the airflow can be adjusted to improve the comfort of the user.

[0138] (Technology 11) A method for controlling a ventilation device as described in Technology 9, in which, when the comfort temperature is between the indoor temperature and the outdoor temperature, and when the concentration of the substance harmful to the human body is a second concentration, the airflow is adjusted so that a fifth airflow, which is the airflow when the comfort temperature is closer to the outdoor temperature than the indoor temperature, is larger than a sixth airflow, which is the airflow when the comfort temperature is closer to the indoor temperature than the outdoor temperature. According to this, when the comfortable temperature is between the indoor temperature and the outdoor temperature, and the concentration of the substance harmful to the human body is the second concentration, the fifth airflow, which is the airflow when the comfortable temperature is closer to the outdoor temperature than the indoor temperature, is adjusted to be larger than the sixth airflow, which is the airflow when the comfortable temperature is closer to the indoor temperature than the outdoor temperature. Therefore, since the fifth airflow is adjusted to be larger than the sixth airflow, the indoor temperature can be brought closer to the comfortable temperature. Therefore, the airflow can be adjusted to improve the comfort of the user.

[0139] (Technology 12) A method for controlling a ventilation device according to Technology 10 or Technology 11, comprising adjusting an airflow rate when the comfort temperature is between the indoor temperature and the outdoor air temperature and when the concentration of a substance harmful to the human body is a third concentration, so that a seventh airflow rate, which is the airflow rate when the outdoor air temperature is closer to the comfort temperature than the indoor temperature, is greater than an eighth airflow rate, which is the airflow rate when the outdoor air temperature is closer to the indoor temperature than the comfort temperature. According to this, when the comfortable temperature is between the indoor temperature and the outdoor temperature, and the concentration of the substance harmful to the human body is the third concentration, the seventh airflow rate, which is the airflow rate when the outdoor temperature is closer to the comfortable temperature than the indoor temperature, is adjusted to be larger than the eighth airflow rate, which is the airflow rate when the outdoor temperature is closer to the indoor temperature than the comfortable temperature, so that the indoor temperature can be brought closer to the comfortable temperature. Therefore, the airflow rate W can be adjusted to improve the comfort of the user.

[0140] (Technology 13) A control device for a ventilation device configured to be able to adjust airflow, the control device including: a first setting unit that sets a first airflow rate of the ventilation device based on a concentration of substances harmful to the human body in a space ventilated by the ventilation device; a judgment unit that judges whether or not to increase the airflow rate; and a second setting unit that increases the first airflow rate to a second airflow rate when the judgment unit judges that the airflow rate should be increased, wherein the judgment unit judges to increase the airflow rate when a comfort temperature of a user present in the space and an outdoor air temperature are lower than an indoor temperature, and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature. According to this, the same effect as the ventilation device control method of Technique 1 can be achieved.

[0141] (Technology 14) A control program for a ventilation device configured to adjust airflow, the control program causing a processor to function as a first setting unit that sets a first airflow rate of the ventilation device based on a concentration of substances harmful to the human body in a space ventilated by the ventilation device, a judgment unit that judges whether to increase the airflow rate, and a second setting unit that increases the first airflow rate to a second airflow rate when the judgment unit judges that the airflow rate should be increased, wherein the judgment unit judges to increase the airflow rate when a comfort temperature of a user present in the space and the outside air temperature are lower than the indoor temperature, and when the comfort temperature and the outside air temperature are higher than the indoor temperature. According to this, the same effect as the ventilation device control method of Technique 1 can be achieved. [Industrial Applicability]

[0142] INDUSTRIAL APPLICABILITY As described above, the ventilation device control method, control device, and control program according to the present disclosure can be used for ventilation purposes that achieve both user safety and comfort. [Explanation of symbols]

[0143] 1. Ventilation system 2. Communications equipment 3 Server device (control device) 4 Carbon dioxide sensor 5 Interior air temperature sensor 6. Outside Air Temperature Sensor 20 Total heat exchanger 21 Blower fan 22 Fan motor 24 First Control Section 25 First communication interface 31 Second Control Section 32 Second Processor (Processor) 100 Ventilation System 321 Second Acquisition Department 322 First Setting Section 324 Judgment section 325 Instruction section 326 Second communication control section 327 Mode Selection Section 328 Device Selection Section 331 Second control program (control program) CC Carbon dioxide concentration (concentration of carbon dioxide) M1 Heat exchange ventilation mode M2 Normal ventilation mode S space TB Comfort Temperature TJ indoor temperature TQ Outside temperature W Air volume W1 1st air volume W2 Second air volume

Claims

1. A method for controlling a ventilation device configured to be able to adjust an air volume, comprising: a first setting step of setting a first airflow rate of the ventilation device based on a concentration of a substance harmful to the human body in a space ventilated by the ventilation device; a determination step of determining whether or not to increase the air volume; a second setting step of increasing the first air volume to a second air volume when it is determined in the determining step that the air volume is to be increased, In the determination step, it is determined that the airflow rate is to be increased when a comfort temperature of the user in the space and an outdoor air temperature are lower than an indoor temperature, and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature. How ventilation equipment is controlled.

2. The first air volume is a necessary and minimum air volume corresponding to the concentration of the substance harmful to the human body. A method for controlling a ventilation system according to claim 1.

3. The substances harmful to the human body include at least one of carbon dioxide, PM2.5, viruses, and mites; A method for controlling a ventilation system according to claim 1.

4. In the determination step, When the comfort temperature is between the indoor temperature and the outdoor temperature, When the comfort temperature is closer to the outdoor temperature than the indoor temperature, it is determined that the airflow rate is to be increased. When the comfort temperature is closer to the indoor temperature than to the outdoor temperature, it is determined that the airflow rate is not to be increased. A method for controlling a ventilation system according to claim 1.

5. In the determination step, When the outdoor temperature is between the indoor temperature and the comfort temperature, When the outdoor temperature is closer to the comfort temperature than the indoor temperature, it is determined that the airflow rate is to be increased; When the outdoor temperature is closer to the indoor temperature than to the comfort temperature, it is determined that the airflow rate is not to be increased. A method for controlling a ventilation device according to any one of claims 1 to 4.

6. The comfort temperature is calculated based on a comfort index. A method for controlling a ventilation system according to claim 1.

7. The ventilation device includes a heat exchanger, The method further includes a mode selection step of switching between a heat exchange ventilation mode in which the heat exchanger is operated and a normal ventilation mode in which the heat exchanger is not operated as an operation mode of the ventilation device, When the heat exchange ventilation mode is selected in the mode selection step, it is determined in the determination step that the air volume is not to be increased, When the normal ventilation mode is selected in the mode selection step, it is determined in the determination step that the air volume is to be increased when the comfort temperature and the outdoor air temperature are lower than the indoor temperature and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature. A method for controlling a ventilation system according to claim 1.

8. The ventilation device includes a plurality of ventilation devices, the substance harmful to the human body is a concentration of the substance harmful to the human body at a position corresponding to each of the plurality of ventilation devices, The method further includes a device selection step of selecting a ventilation device that performs a ventilation operation from among the plurality of ventilation devices based on the concentration of the substance harmful to the human body at each position corresponding to the plurality of ventilation devices. A method for controlling a ventilation system according to claim 1.

9. Further comprising an execution step of executing ventilation at the first air volume or the second air volume, The first setting step, the determination step, the second setting step, and the execution step are repeatedly executed at predetermined intervals; The first setting step includes determining the first airflow rate for the next predetermined period based on a carbon dioxide concentration for the current predetermined period, the determining step determines that the airflow rate in the next predetermined period is to be increased at least when the comfort temperature and the outdoor temperature are lower than the indoor temperature and when the comfort temperature and the outdoor temperature are higher than the indoor temperature in the current predetermined period; A method for controlling a ventilation system according to claim 1.

10. A method for controlling a ventilation device that adjusts an airflow rate based on a concentration of a substance harmful to the human body in a space ventilated by the ventilation device, comprising: When the concentration of the substance harmful to the human body is a first concentration, a third airflow rate, which is an airflow rate when a comfort temperature of the user present in the space and an outdoor air temperature are lower than an indoor temperature, or when the comfort temperature and the outdoor air temperature are higher than the indoor temperature, is adjusted to be larger than a fourth airflow rate, which is an airflow rate when the indoor temperature is between the comfort temperature and the outdoor air temperature. How ventilation equipment is controlled.

11. When the comfort temperature is between the indoor temperature and the outdoor temperature, When the concentration of the substance harmful to the human body is a second concentration, a fifth airflow rate, which is an airflow rate when the comfort temperature is closer to the outside air temperature than the indoor temperature, is adjusted to be larger than a sixth airflow rate, which is an airflow rate when the comfort temperature is closer to the indoor temperature than the outdoor air temperature. A method for controlling a ventilation device according to claim 10.

12. When the comfort temperature is between the indoor temperature and the outdoor temperature, When the concentration of the substance harmful to the human body is a third concentration, a seventh airflow rate, which is an airflow rate when the outside air temperature is closer to the comfortable temperature than the indoor temperature, is adjusted to be larger than an eighth airflow rate, which is an airflow rate when the outside air temperature is closer to the indoor temperature than the comfortable temperature. A method for controlling a ventilation device according to claim 10.

13. A control device for a ventilation device configured to adjust an air volume, a first setting unit that sets a first airflow rate of the ventilation device based on a concentration of a substance harmful to the human body in a space ventilated by the ventilation device; A determination unit that determines whether or not to increase the air volume; a second setting unit that increases the first air volume to a second air volume when the determination unit determines that the air volume should be increased, the determination unit determines to increase the airflow rate when a comfort temperature of the user present in the space and an outdoor air temperature are lower than an indoor temperature, and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature. Control device.

14. A control program for a ventilation device configured to adjust an air volume, a first setting unit that sets a first air volume of the ventilation device based on a concentration of a substance harmful to the human body in a space ventilated by the ventilation device; A determination unit that determines whether or not to increase the air volume; and a second setting unit that increases the first air volume to a second air volume when the determination unit determines that the air volume should be increased; The processor functions as the determination unit determines to increase the airflow rate when a comfort temperature of the user present in the space and an outdoor air temperature are lower than an indoor temperature, and when the comfort temperature and the outdoor air temperature are higher than the indoor temperature. Control program.

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