Ventilation device

Abstract

To provide a ventilation device which suppresses lowering of user's comfort.SOLUTION: A ventilation device includes: an air supply fan 10 for supplying outdoor air to the inside; an exhaust fan 11 for exhausting indoor air to the outdoor; a particulate concentration measurement part 9 for measuring a particulate concentration value of the outdoor air; a carbon dioxide concentration measurement part 8 for measuring a carbon dioxide concentration value of the indoor air; and a control part 12 for controlling the air supply fan 10 and the exhaust fan 11. The control part 12 includes: an air amount control part 26 for performing air amount control in such a manner that an exhaust air amount of the exhaust fan 11 and a supply air amount of the air supply fan 10 become the same; an air amount determination part 23 for determining the exhaust air amount and the supply air amount based on the carbon dioxide concentration value of the indoor air; and an air amount correction part 25 for correcting the exhaust air amount and the supply air amount determined by the air amount determination part 23 based on the particulate concentration value of the outdoor air. The air amount control part 26 performs air amount control by the exhaust air amount and the supply air amount corrected by the air amount correction part 25.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a ventilation device.

Background Art

[0002] Conventionally, a ventilation fan (ventilation device) that detects the indoor air state and controls ventilation has been known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional ventilation device, ventilation is controlled based on the indoor air state, and the outdoor air state is not considered. For example, when the indoor air is exhausted, the indoor becomes negative pressure, and it is conceivable that the outdoor air flows into the indoor. At this time, depending on the outdoor air state, the comfort of the user may be reduced due to the inflow of the outdoor air.

[0005] Therefore, the present invention solves the above-mentioned conventional problems, and an object thereof is to provide a ventilation device that suppresses a reduction in user comfort.

Means for Solving the Problems

[0006] And, in order to achieve this object, the ventilation device according to the present invention includes an air supply fan that supplies outdoor air indoors, an exhaust fan that exhausts indoor air outdoors, a particulate concentration measurement unit that measures the particulate concentration value of outdoor air, a carbon dioxide concentration measurement unit that measures the carbon dioxide concentration value of indoor air, and a control unit that controls the air supply fan and the exhaust fan. The control unit includes an air volume control unit that performs air volume control so that the exhaust air volume of the exhaust fan and the air supply volume of the air supply fan are the same, an air volume determination unit that determines the exhaust air volume and the air supply volume based on the carbon dioxide concentration value of indoor air measured by the carbon dioxide concentration measurement unit, and an air volume correction unit that corrects the exhaust air volume and the air supply volume determined by the air volume determination unit based on the particulate concentration value of outdoor air measured by the particulate concentration measurement unit. The air volume control unit performs air volume control with the exhaust air volume and the air supply volume corrected by the air volume correction unit, thereby achieving the intended object.

Advantages of the Invention

[0007] According to the present invention, it is possible to provide a ventilation device that suppresses a decrease in user comfort.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. However, the embodiments shown below are examples for embodying the technical idea of the present invention, and the present invention is not limited to the following. In particular, the materials, shapes, components, arrangements of components, and relative arrangements described in the embodiments are examples, and are not intended to limit the scope of the present invention thereto. No. Also, in each figure, the same reference numerals are given to substantially the same configurations, and duplicate explanations are omitted or simplified.

[0010] (Embodiment) First, a ventilation device according to an embodiment of the present invention will be described. The ventilation device according to the present embodiment is a device capable of supplying air into a room and exhausting the air in the room. FIG. 1 is a configuration diagram of the ventilation device according to the present embodiment. The ventilation device 100 can be installed in the ceiling space, side wall, or under the floor of a building, connects the indoor space and the outdoor space, and ventilates the indoor space with the air exhausted from the indoor to the outdoor (exhaust air flow 7 described later) and the air supplied from the outdoor to the indoor (supply air flow 6 described later).

[0011] Here, the exhaust air flow 7 is the flow of air discharged from the indoor to the outdoor. The exhaust air flow 7 is conveyed from the indoor to the ventilation device 100. The exhaust air flow 7 conveyed to the ventilation device 100 is discharged from the ventilation device 100 to the outdoor. The exhaust air flow 7 may be conveyed from the indoor to the ventilation device 100 through a duct. The exhaust air flow 7 conveyed to the ventilation device 100 may be discharged from the ventilation device 100 to the outdoor through a duct.

[0012] The supply air flow 6 is the flow of air introduced from the outdoor to the indoor. The supply air flow 6 is conveyed from the outdoor to the ventilation device 100. The supply air flow 6 conveyed to the ventilation device 100 is introduced from the ventilation device 100 into the indoor. The supply air flow 6 may be conveyed from the outdoor to the ventilation device 100 through a duct. The supply air flow 6 conveyed to the ventilation device 100 may be introduced from the ventilation device 100 into the indoor through a duct.

[0013] As shown in FIG. 1, the ventilation device 100 includes a main body 1.

[0014] The main body 1 has a housing in a substantially rectangular parallelepiped shape. An inner air inlet 5, an exhaust port 3, an outdoor air inlet 4, and a supply air inlet 2 are provided on the side surface of the main body 1.

[0015] The indoor air intake 5 is an inlet for taking in indoor air RA (exhaust air flow 7) into the ventilation device 100. The exhaust outlet 3 is an outlet for discharging the exhaust air flow 7 as exhaust EA from the ventilation device 100 to the outside. The outdoor air intake 4 is an inlet for taking in outdoor air OA (supply air flow 6) into the ventilation device 100. The supply air outlet 2 is an outlet for discharging the supply air flow 6 as supply SA from the ventilation device 100 to the inside.

[0016] Furthermore, inside the main body 1, an exhaust fan 11 and a supply fan 10 are provided.

[0017] The exhaust fan 11 is a blower for taking in the exhaust air flow 7 from the indoor air intake 5 and discharging it from the exhaust outlet 3. That is, the exhaust fan 11 exhausts indoor air to the outside.

[0018] The supply fan 10 is a blower for taking in the supply air flow 6 from the outdoor air intake 4 and discharging it from the supply air outlet 2. That is, the supply fan 10 supplies outdoor air to the inside.

[0019] Also, inside the main body 1, an exhaust air duct connecting the indoor air intake 5 and the exhaust outlet 3 and a supply air duct connecting the outdoor air intake 4 and the supply air outlet 2 are formed. The exhaust air flow 7 sucked in by the exhaust fan 11 passes through the exhaust fan 11 in the exhaust air duct and is discharged from the exhaust outlet 3 to the outside. Also, the supply air flow 6 sucked in by the supply fan 10 passes through the supply fan 10 in the supply air duct and is supplied from the supply air outlet 2 to the inside.

[0020] Furthermore, the main body 1 includes a carbon dioxide concentration measurement unit 8 and a particulate matter concentration measurement unit 9.

[0021] The carbon dioxide concentration measurement unit 8 measures the carbon dioxide concentration value of the indoor air. The carbon dioxide concentration measurement unit 8 is, for example, a carbon dioxide sensor. Known techniques are used for measuring the carbon dioxide concentration value. In the present embodiment, the carbon dioxide concentration measurement unit 8 is provided upstream of the exhaust fan 11 on the exhaust air path, but it may also be provided downstream of the exhaust fan 11 on the exhaust air path. Since the carbon dioxide concentration measurement unit 8 measures the carbon dioxide concentration value of the indoor air, it is preferably provided in the vicinity of the inner air inlet 5 close to the inside of the room in the exhaust air path. Thereby, the carbon dioxide concentration measurement unit 8 measures the carbon dioxide concentration value of the indoor air taken into the main body 1 from the inner air inlet 5. Also, the carbon dioxide concentration measurement unit 8 does not have to be provided in the main body 1. For example, the carbon dioxide concentration measurement unit 8 may be provided indoors, and the carbon dioxide concentration value of the indoor air measured by the carbon dioxide concentration measurement unit 8 may be transmitted to the control unit 12 described later by wired communication or wireless communication.

[0022] The particulate matter concentration measurement unit 9 measures the particulate matter concentration value of the outdoor air. The particulate matter concentration measurement unit 9 is, for example, a PM2.5 sensor. Known techniques are used for measuring the particulate matter concentration value. In the present embodiment, the particulate matter concentration measurement unit 9 is provided upstream of the supply air fan 10 on the supply air path, but it may also be provided downstream of the supply air fan 10 on the supply air path. Since the particulate matter concentration measurement unit 9 measures the particulate matter concentration value of the outdoor air, it is preferably provided in the vicinity of the outside air inlet 4 close to the outside of the room in the supply air path. Thereby, the particulate matter concentration measurement unit 9 measures the particulate matter concentration value of the outdoor air taken into the main body 1 from the outside air inlet 4. Also, the particulate matter concentration measurement unit 9 does not have to be provided in the main body 1. For example, the particulate matter concentration measurement unit 9 may be provided outdoors, and the particulate matter concentration value of the outdoor air measured by the particulate matter concentration measurement unit 9 may be transmitted to the control unit 12 by wired communication or wireless communication.

[0023] Also, the ventilation device 100 includes a control unit 12. The control unit 12 controls the supply air fan 10 and the exhaust fan 11. The control unit 12 is electrically communicably connected to the carbon dioxide concentration measurement unit 8, the particulate matter concentration measurement unit 9, the supply air fan 10, and the exhaust fan 11, and controls the ventilation device 100. Details of the control content of the control unit 12 will be described later.

[0024] Next, with reference to FIG. 2, each function of the control unit 12 according to the embodiment of the present invention will be described. FIG. 2 is a schematic functional block diagram of the control unit 12 and the peripheral unit.

[0025] The control unit 12 includes a carbon dioxide concentration acquisition unit 21, a particulate matter concentration acquisition unit 22, an air volume determination unit 23, a storage unit 24, an air volume correction unit 25, and an air volume control unit 26.

[0026] The carbon dioxide concentration acquisition unit 21 acquires the carbon dioxide concentration measured by the carbon dioxide concentration measurement unit 8.

[0027] The particulate matter concentration acquisition unit 22 acquires the particulate matter concentration value measured by the particulate matter concentration measurement unit 9.

[0028] The air volume determination unit 23 determines the exhaust air volume by the exhaust fan 11 and the supply air volume by the supply fan 10 based on the carbon dioxide concentration value of the indoor air measured by the carbon dioxide concentration measurement unit 8. That is, the air volume determination unit 23 determines the exhaust air volume and the supply air volume based on the carbon dioxide concentration value of the indoor air acquired by the carbon dioxide concentration acquisition unit 21. Specifically, the larger the carbon dioxide concentration value acquired by the carbon dioxide concentration acquisition unit 21, the larger the exhaust air volume and the supply air volume determined by the air volume determination unit 23. In addition, the air volume determination unit 23 determines the exhaust air volume and the supply air volume to be the same air volume.

[0029] Here, in this embodiment, as an example, the air volumes that can be set for the exhaust fan 11 and the supply fan 10 are six levels. The breakdown of the six levels is that the air volume is zero (operation stop or air volume level Let them be 0 (which can also be said), air volume level 1, air volume level 2, air volume level 3, air volume level 4, and air volume level 5. The relationship of the magnitudes of the air volumes is that air volume zero (operation stop) < air volume level 1 < air volume level 2 < air volume level 3 < air volume level 4 < air volume level 5. In this embodiment, as an example, air volume zero is 0 CFM (Cubic Feet per Minute), air volume level 1 is 20 CFM, air volume level 2 is 40 CFM, air volume level 3 is 60 CFM, air volume level 4 is 80 CFM, and air volume level 5 is 100 CFM. However, the air volume of each air volume level can be set arbitrarily.

[0030] The air volume determination unit 23 determines the exhaust air volume and the supply air volume to a higher air volume level as the carbon dioxide concentration value acquired by the carbon dioxide concentration acquisition unit 21 is higher. In this embodiment, as an example, the air volume determination unit 23 determines the exhaust air volume and the supply air volume by comparing the carbon dioxide concentration value with a first threshold value and a second threshold value greater than the first threshold value. The first threshold value is, for example, 800 ppm (parts per million), which is the carbon dioxide concentration standard value recommended by the US Centers for Disease Control and Prevention and the UK Health and Safety Executive. The second threshold value is, for example, 1000 ppm, which is the carbon dioxide concentration standard value determined for the purpose of ensuring a hygienic environment in buildings such as buildings and department stores. However, the above first threshold value and second threshold value are merely examples, and the first threshold value and the second threshold value can be set arbitrarily. The air volume of each air volume level, the first threshold value, and the second threshold value are stored in the storage unit 24, which is a so-called memory.

[0031] In this embodiment, as an example, if the carbon dioxide concentration value is less than the first threshold value, the air volume determination unit 23 determines the exhaust air volume and the supply air volume to be air volume level 2. Also, if the carbon dioxide concentration value is equal to or greater than the first threshold value and less than the second threshold value, the air volume determination unit 23 determines the exhaust air volume and the supply air volume to be air volume level 4. Further, if the carbon dioxide concentration value is greater than the second threshold value, the air volume determination unit 23 determines the exhaust air volume and the supply air volume to be air volume level 5.

[0032] The air volume correction unit 25 corrects the exhaust air volume and the supply air volume determined by the air volume determination unit 23 based on the particulate matter concentration value of the outdoor air measured by the particulate matter concentration measurement unit 9. That is, the air volume correction unit 25 corrects the exhaust air volume and the supply air volume determined by the air volume determination unit 23 based on the particulate matter concentration value of the outdoor air acquired by the particulate matter concentration acquisition unit 22. Specifically, the larger the particulate matter concentration value, the smaller the exhaust air volume and the supply air volume determined by the air volume determination unit 23 are corrected to.

[0033] In this embodiment, as an example, the air volume correction unit 25 compares the particulate matter concentration value with a third threshold value and a fourth threshold value greater than the third threshold value to determine whether to correct the exhaust air volume and the supply air volume, and to determine the correction amount. The third threshold value is, for example, 35 micrograms / cubic meter, which is determined as a level that is desirably maintained in order to appropriately protect human health based on Article 16, Paragraph 1 of the Basic Environment Law. The fourth threshold value is, for example, 70 micrograms / cubic meter, which is determined as a particulate matter concentration level at which the possibility of health effects occurring is predicted by an expert meeting on fine particulate matter established by the Ministry of the Environment in 2013. However, the above third threshold value and fourth threshold value are merely examples, and the third threshold value and the fourth threshold value can be arbitrarily set. The third threshold value and the fourth threshold value are also stored in the storage unit 24.

[0034] In this embodiment, as an example, if the particulate matter concentration value is equal to or greater than the third threshold value and less than the fourth threshold value, the air volume correction unit 25 corrects the exhaust air volume and the supply air volume to a smaller air volume than the exhaust air volume and the supply air volume determined by the air volume determination unit 23. Further, if the particulate matter concentration value is equal to or greater than the fourth threshold value, the air volume correction unit 25 corrects the exhaust air volume and the supply air volume to an even smaller air volume than the air volume corrected when the particulate matter concentration value is equal to or greater than the third threshold value and less than the fourth threshold value.

[0035] For example, the exhaust air volume and the supply air volume determined by the air volume determination unit 23 are at air volume level 2 When the particulate matter concentration value is equal to or greater than the third threshold value and less than the fourth threshold value, the air volume correction unit 25 corrects the exhaust air volume and the supply air volume to the air volume level 1. When the particulate matter concentration value is equal to or greater than the fourth threshold value, the exhaust air volume and the supply air volume are corrected to zero air volume. Further, when the exhaust air volume and the supply air volume determined by the air volume determination unit 23 are at the air volume level 4, the air volume correction unit 25 corrects the exhaust air volume and the supply air volume to the air volume level 3 when the particulate matter concentration value is equal to or greater than the third threshold value and less than the fourth threshold value, and corrects the exhaust air volume and the supply air volume to the air volume level 1 when the particulate matter concentration value is equal to or greater than the fourth threshold value. Further, when the exhaust air volume and the supply air volume determined by the air volume determination unit 23 are at the air volume level 5, the air volume correction unit 25 corrects the exhaust air volume and the supply air volume to the air volume level 4 when the particulate matter concentration value is equal to or greater than the third threshold value and less than the fourth threshold value, and corrects the exhaust air volume and the supply air volume to the air volume level 2 when the particulate matter concentration value is equal to or greater than the fourth threshold value. The above correction amount by the air volume correction unit 25 is merely an example and can be arbitrarily set by conducting experiments or the like in advance.

[0036] The air volume control unit 26 performs air volume control so that the exhaust air volume of the exhaust fan 11 and the supply air volume of the supply fan 10 are the same. The air volume control unit 26 performs constant air volume control to make the supply air volume and the exhaust air volume constant. Since the constant air volume control is a known technique, a detailed description thereof is omitted. Further, the air volume control unit 26 performs air volume control with the exhaust air volume and the supply air volume corrected by the air volume correction unit 25.

[0037] Each functional block of the control unit 12 can be realized as hardware by elements and mechanical devices including a computer's CPU (Central Processing Unit), and can be realized as software by a computer program or the like. Here, however, it is a functional block realized by the cooperation of these. Therefore, these functional blocks can be realized in various forms by a combination of hardware and software.

[0038] Next, the control executed by the control unit 12 will be described using the flowchart of FIG. 3. In the flowchart, numbers are assigned with S as the initial letter. For example, S1 etc. indicate processing steps. However, the magnitude of the numerical values indicating the processing steps has no relation to the processing order.

[0039] First, the carbon dioxide concentration acquisition unit 21 acquires the carbon dioxide concentration of the indoor air from the carbon dioxide concentration measurement unit 8 (S1).

[0040] The air volume determination unit 23 determines the exhaust air volume and the supply air volume based on the carbon dioxide concentration value of the indoor air acquired by the carbon dioxide concentration acquisition unit 21 (S2). At this time, the larger the carbon dioxide concentration value, the larger the exhaust air volume and the supply air volume are determined. The reason for this will be explained.

[0041] It has been proven that as the carbon dioxide concentration value increases, it hinders the decision-making and concentration of users present indoors. In the worst case, it causes health hazards such as headaches and breathing difficulties. Therefore, the air volume determination unit 23 determines the exhaust air volume and the supply air volume to be larger as the indoor carbon dioxide concentration value is larger. Thereby, an increase in the indoor carbon dioxide concentration value can be suppressed, and as a result, a decrease in user comfort can be suppressed.

[0042] Here, if the exhaust air volume and the supply air volume are always determined to be at air volume level 5, the increase in the indoor carbon dioxide concentration value can be suppressed to the maximum extent. However, always setting the exhaust air volume and the supply air volume to air volume level 5 has the demerit of an increase in electricity cost due to large power consumption. Also, always setting the exhaust air volume and the supply air volume to air volume level 5 may reduce user comfort due to the noise generated by operating the exhaust fan 11 and the supply fan 10 at a large air volume. Therefore, it is desirable that the exhaust air volume and the supply air volume are appropriately determined according to the indoor carbon dioxide concentration value. The above explanation is completed.

[0043] In addition, the air volume determination unit 23 determines the exhaust air volume and the supply air volume to be the same air volume. For example, if the exhaust air volume is made larger than the supply air volume, the indoor pressure will become negative, which will cause various demerits such as continuously taking in pollutants and pollen from the outside into the room, and making it difficult to open the outward-opening entrance door. Also, if the supply air volume is made larger than the exhaust air volume, the indoor pressure will become positive, which will cause demerits such as the moisture generated indoors easily penetrating into the wall. Therefore, the air volume determination unit 23 determines the exhaust air volume and the supply air volume to be the same air volume.

[0044] Next, the particulate matter concentration acquisition unit 22 acquires the particulate matter concentration of the outdoor air from the particulate matter concentration measurement unit 9 (S3).

[0045] The air volume correction unit 25 corrects the exhaust air volume and the supply air volume determined by the air volume determination unit 23 based on the particulate matter concentration value of the outdoor air acquired by the particulate matter concentration acquisition unit (S4). At this time, the larger the particulate matter concentration value, the smaller the exhaust air volume and the supply air volume determined by the air volume determination unit 23 are corrected. The reason for this will be explained.

[0046] Increasing the supply air volume when the particulate matter concentration value of the outdoor air is high will cause particulate matter to be taken into the room and the particulate matter concentration in the room to increase. When the particulate matter concentration value in the room becomes high, health hazards and a decrease in comfort for the users present in the room are feared. Therefore, the air volume correction unit corrects the exhaust air volume and the supply air volume determined by the air volume determination unit 23 to a smaller air volume as the particulate matter concentration value of the outdoor air is larger. That is, if the outdoor particulate matter concentration is equal to or higher than the third threshold value, the exhaust air volume and the supply air volume determined by the air volume determination unit 23 are corrected to a smaller air volume. Thereby, an increase in the particulate matter concentration value in the room can be suppressed, and as a result, a decrease in user comfort can be suppressed.

[0047] Note that if the outdoor particulate matter concentration is less than the third threshold value, the air volume correction unit 25 does not correct the exhaust air volume and the supply air volume determined by the air volume determination unit 23. That is, step S4 is skipped.

[0048] Air volume control section 26 controls the air volumes based on the exhaust air volume and the supply air volume corrected by air volume correction section 25 (S5).

[0049] The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and it can be easily inferred that various improvements and modifications are possible within the scope of the present invention without departing from the spirit of the present invention.

[0050] As can be seen from the above embodiment, the control unit determines the exhaust air volume and the supply air volume by prioritizing the indoor carbon dioxide concentration value over the outdoor particulate concentration value. If the indoor carbon dioxide concentration value is high, the worst case scenario is that the user may suffer from breathing difficulties or other damage, so it is desirable to determine the exhaust air volume and the supply air volume by prioritizing the indoor carbon dioxide concentration value over the outdoor particulate concentration value. This allows for control that takes into account the degree of adverse effects on the user's health. As a result, it is possible to suppress serious health damage to the user.

[0051] (Summary of the invention) The ventilation device according to the present invention includes a supply fan that supplies outdoor air indoors, an exhaust fan that exhausts indoor air outdoors, a particulate matter concentration measurement unit that measures a particulate matter concentration value of the outdoor air, a carbon dioxide concentration measurement unit that measures a carbon dioxide concentration value of the indoor air, and a control unit that controls the supply air fan and the exhaust air fan, and the control unit controls the exhaust air volume of the exhaust fan and the supply air volume of the supply air fan. The air volume control unit controls the air volume so that the air volumes are the same, an air volume determination unit determines the exhaust air volume and the supply air volume based on the carbon dioxide concentration value of the indoor air measured by the carbon dioxide concentration measurement unit, and an air volume correction unit corrects the exhaust air volume and the supply air volume determined by the air volume determination unit based on the particulate matter concentration value of the outdoor air measured by the particulate matter concentration measurement unit, and the air volume control unit controls the air volume with the exhaust air volume and the supply air volume corrected by the air volume correction unit. This makes it possible to suppress a decrease in user comfort.

[0052] Further, the air volume determination unit may determine the exhaust air volume and the supply air volume to be a larger air volume as the carbon dioxide concentration value is larger. Thereby, it is possible to suppress an increase in the carbon dioxide concentration indoors with an appropriate ventilation volume. As a result, it is possible to suppress a decrease in the comfort of the user.

[0053] Further, the air volume correction unit may correct the exhaust air volume and the supply air volume determined by the air volume determination unit to a smaller air volume as the particulate matter concentration value is larger. Thereby, it is possible to suppress an increase in the particulate matter concentration indoors. As a result, it is possible to suppress a decrease in the comfort of the user.

[0054] Further, the control unit may determine the exhaust air volume and the supply air volume by prioritizing the indoor carbon dioxide concentration value over the outdoor particulate matter concentration value. Thereby, control considering the degree of adverse impact on the health damage of the user can be performed. As a result, it is possible to suppress severe health damage to the user.

Industrial Applicability

[0055] The present invention is useful for a ventilation device including a blower and the like.

Explanation of Signs

[0056] 1 Main body 2 Supply air port 3 Exhaust air port 4 Outdoor air port 5 Indoor air port 6 Supply air flow 7 Exhaust air flow 8 Carbon dioxide concentration measurement unit 9 Particulate matter concentration measurement unit 10 Supply air fan 11 Exhaust air fan 12 Control unit 21 Carbon dioxide concentration acquisition unit 22 Particulate matter concentration acquisition unit 23 Air volume determination unit 24 Storage unit 25 Air volume correction unit 26 Air volume control unit 100 Ventilation device

Claims

1. An air supply fan for supplying outdoor air into the room, an exhaust fan for exhausting indoor air to the outside, a particulate concentration measurement unit for measuring the particulate concentration value of the outdoor air, a carbon dioxide concentration measurement unit for measuring the carbon dioxide concentration value of the indoor air, and a control unit for controlling the air supply fan and the exhaust fan, wherein the control unit includes an air volume control unit for performing air volume control so that the exhaust air volume of the exhaust fan and the air supply volume of the air supply fan are the same, an air volume determination unit for determining the exhaust air volume and the air supply volume based on the carbon dioxide concentration value of the indoor air measured by the carbon dioxide concentration measurement unit, and an air volume correction unit for correcting the exhaust air volume and the air supply volume determined by the air volume determination unit based on the particulate concentration value of the outdoor air measured by the particulate concentration measurement unit, wherein the air volume control unit is a ventilation device that performs air volume control with the exhaust air volume and the air supply volume corrected by the air volume correction unit.

2. The air volume determination unit is the ventilation device according to Claim 1, which determines a larger exhaust air volume and a larger air supply volume as the carbon dioxide concentration value is larger.

3. The air volume correction unit is the ventilation device according to Claim 1, which corrects the exhaust air volume and the air supply volume determined by the air volume determination unit to a smaller air volume as the particulate concentration value is larger.

4. The control unit is the ventilation device according to Claims 1 to 3, which determines the exhaust air volume and the air supply volume by prioritizing the carbon dioxide concentration value of the indoor air over the particulate concentration value of the outdoor air.

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