JP7462594B2 - Ventilation system - Google Patents

Description

This disclosure relates to a ventilation system that supplies outside air to a room and exhausts indoor air to the outdoors.

Ceiling or wall-mounted ventilation equipment is installed in each room to provide ventilation airflow appropriate to the size of the room or the number of occupants. In recent years, problems such as volatile organic compounds (VOCs) emitted from building materials in homes have become apparent, making it necessary to provide ventilation with an appropriate ventilation airflow for each room, such as constant ventilation 24 hours a day.

In Patent Document 1, a ventilation unit is installed in the living/dining/kitchen area, and another ventilation unit is installed in the toilet and bathroom, and each ventilation unit exchanges information such as provisional total ventilation air volume and priority air volume, and determines and operates its own ventilation air volume based on the total ventilation air volume information determined by the total ventilation air volume determination means and the priority air volume information that takes precedence over the set air volume of the installed ventilation unit. Patent Document 1 also describes that the external air volume setting unit mounting hole may be equipped with at least one of a human presence sensor, temperature sensor, humidity sensor, carbon monoxide sensor, carbon dioxide sensor, and illuminance sensor, and the external set air volume may be determined according to the detection state of the sensor.

Patent No. 6178980

However, in Patent Document 1, information about ventilation in each room is sent between the rooms, which requires communication functions, resulting in high costs and complicated control. In addition, if sensors are provided in each room, there is also the problem that the system becomes expensive. In addition, because the ventilation system is composed only of exhaust fans, there is a possibility that the supply of air will be insufficient, further reducing comfort.

The present disclosure has been made in consideration of the above, and aims to provide a ventilation system that can comfortably ventilate multiple rooms with low cost and simple control.

In order to solve the above-mentioned problems and achieve the object, the ventilation system in the present disclosure is a ventilation system for ventilating a first room, which is a common room shared by a plurality of people, and a second room, which is a living room partitioned separately from the first room . The ventilation system includes a first supply ventilation device provided in the first room and supplying outdoor air to the first room, a first exhaust ventilation device provided in the first room and discharging the air of the first room to the outdoors, a second supply ventilation device provided in the second room and supplying outdoor air to the second room, a second exhaust ventilation device provided in the second room and discharging the air of the second room to the outdoors, _a CO2 concentration control switch that selects whether there is a positive correlation or a negative correlation between the first room and the second room with respect to the CO2 _{concentration} , and a control unit. The first supply ventilation device has a first environment detection sensor that detects the temperature and humidity of the outdoors, and the first exhaust ventilation device has a second environment detection sensor that detects the temperature, humidity, and CO2 concentration of the first room. The control unit calculates a discomfort index for the first room based on the temperature and humidity obtained from the first environmental detection sensor and the temperature and humidity obtained from the second environmental detection sensor, and if _the CO2 concentration is greater than a threshold value, increases the airflow rates of the first supply air ventilator, the first exhaust air ventilator, the second supply air ventilator and the second exhaust air ventilator from the current levels to perform forced exhaust and forced supply, and controls the airflow rates of the first supply air ventilator, the first exhaust air ventilator, the second supply air ventilator and the second exhaust air ventilator so that the detected _CO2 concentration becomes smaller than the threshold value and the discomfort index for the first room becomes smaller than a reference value. When the _CO2 concentration control switch is selected to a positive correlation and the CO2 concentration increases from the current level, the control unit increases the airflow of the first supply air ventilator, the first exhaust air ventilator, the second supply air ventilator and the second exhaust air ventilator from the current level, and when the CO2 _{concentration} control switch is selected _to a negative correlation and the CO2 _{concentration} increases from the current level, the control unit increases the airflow of the first supply air ventilator and the first exhaust air ventilator from the current level and decreases the airflow of the second supply air ventilator and the second exhaust air ventilator from the current level.

The ventilation system disclosed herein has the advantage of being able to provide comfortable ventilation for multiple rooms with low cost and simple control.

FIG. 1 is a plan view showing an example of an arrangement of ventilation devices in a ventilation system according to an embodiment; FIG. 1 is a perspective view showing an internal configuration of a first supply air ventilator provided in a ventilation system according to an embodiment; FIG. 1 is a cross-sectional view showing an internal configuration of a first supply air ventilator provided in a ventilation system according to an embodiment. FIG. 1 is a schematic cross-sectional view showing an air flow in a first supply air ventilator provided in a ventilation system according to an embodiment. FIG. 1 is a perspective view showing an internal configuration of a first exhaust ventilation device provided in a ventilation system according to an embodiment; FIG. 1 is a cross-sectional view showing an internal configuration of a first exhaust ventilation device provided in a ventilation system according to an embodiment. FIG. 2 is a schematic cross-sectional view showing the air flow in the first exhaust ventilation device provided in the ventilation system according to the embodiment; 1 is a flowchart showing an example of the operation of a ventilation system according to an embodiment.

The ventilation system according to the embodiment is described in detail below with reference to the drawings.

Embodiment
1 is a plan view showing an example of the arrangement of ventilators in a ventilation system according to an embodiment. A first supply ventilator 1a and a first exhaust ventilator 1b are installed in a common room 100 as a first room. A second supply ventilator 2a and a second exhaust ventilator 2b are installed in a living room 200 as a second room. A control unit 3 for controlling the operation of the first supply ventilator 1a, the first exhaust ventilator 1b, the second supply ventilator 2a, and the second exhaust ventilator 2b is installed in the ceiling or inside the wall.

The first supply air ventilation device 1a supplies outdoor air to the common room 100. The first exhaust air ventilation device 1b exhausts air from the common room 100 to the outdoors. The second supply air ventilation device 2a supplies outdoor air to the living room 200. The second exhaust air ventilation device 2b exhausts air from the living room 200 to the outdoors.

The first supply air ventilation device 1a is equipped with an environment detection sensor 4a as a first environment detection sensor for detecting outdoor environmental information such as temperature and humidity, and transmits the temperature and humidity detected by the environment detection sensor 4a to the control unit 3. The environment detection sensor 4a detects the outdoor temperature and humidity. The first exhaust air ventilation device 1b is equipped with an environment detection sensor 4b as a second environment detection sensor for detecting indoor environmental information such as temperature, humidity, and _CO2 concentration, and transmits the temperature, humidity, and _CO2 concentration detected by the environment detection sensor 4b to the control unit 3. The environment detection sensor 4b detects the indoor temperature, humidity, and _CO2 concentration of the common room 100.

The control unit 3 calculates the discomfort index in the room based on the temperature information and humidity information received from the environment detection sensors 4a and 4b, and determines the air volumes of the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b based on the calculation results. The control unit 3 transmits each determined air volume to the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b. The first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b control the air volumes of the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b based on the received air volumes.

The control unit 3 also determines the _CO2 concentration in the common room 100 from the _CO2 concentration information received from the environment detection sensor 4b, and determines the air volumes of the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b based on the determination result. The control unit 3 transmits each determined air volume to the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b. The first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b control the air volumes of the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b based on the received air volumes.

That is, based on the detection results of the environmental detection sensors 4a, 4b, the control unit 3 controls the _air volume of the first supply air ventilation device 1a, the first exhaust air ventilation device 1b, the second supply air ventilation device 2a, and the second exhaust air ventilation device 2b so that the CO2 concentration in the common room 100 is lower than the threshold value and the discomfort index in the common room 100 is lower than the reference value.

Figure 2 is a perspective view showing the internal configuration of the first supply air ventilator 1a provided in the ventilation system according to the embodiment. Figure 3 is a cross-sectional view showing the internal configuration of the first supply air ventilator 1a provided in the ventilation system according to the embodiment. Figure 4 is a schematic cross-sectional view showing the air flow in the first supply air ventilator 1a provided in the ventilation system according to the embodiment. In Figure 2, the first supply air ventilator 1a is viewed from the bottom, that is, from the indoor side.

As shown in Figures 2 to 4, the first supply air ventilation device 1a has a rectangular parallelepiped housing 20. A motor 21 is held on the upper surface of the housing 20. The motor 21 rotates a fan 22. An intake port 23 is provided on the side of the housing 20. An outlet port 25 is provided on the lower surface of the housing 20. As shown in Figure 4, the first supply air ventilation device 1a has an intake air passage 24 formed from the intake port 23 to the lower part of the fan 22.

In the first supply air ventilation device 1a, air is sucked in from the lower center of the fan 22 as the fan 22 rotates, and an airflow is generated in the outer radial direction from the center of rotation of the fan 22. The airflow generated by the fan 22 is efficiently guided to the air outlet 25 by the scroll casing 26 on the outside of the fan 22, and is supplied to the common room 100 from the air outlet 25 provided on the underside of the housing 20.

The environmental detection sensor 4a is installed in the air passage from the air intake 23 to the fan 22.

Figure 5 is a perspective view showing the internal configuration of the first exhaust ventilation device 1b provided in the ventilation system according to the embodiment. Figure 6 is a cross-sectional view showing the internal configuration of the first exhaust ventilation device 1b provided in the ventilation system according to the embodiment. Figure 7 is a schematic cross-sectional view showing the air flow in the first exhaust ventilation device 1b provided in the ventilation system according to the embodiment. In Figure 5, the first exhaust ventilation device 1b is viewed from the bottom, that is, from the indoor side.

As shown in Figures 5 to 7, the first exhaust ventilation device 1b has a rectangular parallelepiped housing 30. A motor 31 is held on the top surface of the housing 30. The motor 31 rotates a fan 32. An intake port 33 is provided on the bottom surface of the housing 30. The intake port 33 is covered by a decorative grill 34 having multiple openings. An exhaust port 35 is provided on the side surface of the housing 30.

In the first exhaust ventilation device 1b, air is sucked in from the center of the lower part of the fan 32 as the fan 32 rotates, and an airflow is generated in the radial direction from the center of rotation of the fan 32. The airflow generated by the fan 32 is efficiently guided to the air outlet 35 by the scroll casing 36 on the outside of the fan 32, and is exhausted from the air outlet 35 to the outdoors.

The environmental detection sensor 4b is installed in the air passage from the air intake 33 to the fan 32.

FIG. 8 is a flowchart showing an example of the operation of the ventilation system according to the embodiment. First, the control unit 3 determines whether the CO ₂ concentration is equal to or higher than the threshold based on the detection information of the environment detection sensor 4b of the first exhaust ventilation device 1b in the common room 100 (step S100). If the CO ₂ concentration is equal to or higher than the threshold (step S100: Yes), the control unit 3 changes the air volume of the first supply air ventilator 1a, the first exhaust ventilation device 1b, the second supply air ventilator 2a, and the second exhaust ventilation device 2b to the maximum air volume to perform forced exhaust and forced supply (step S110). This controls the CO ₂ concentration to be less than the threshold in a short time. Note that the process of step S110 may be performed when the CO ₂ concentration is greater than the threshold. In addition, in the process of step S110, the control unit 3 may increase the air volume of the first supply air ventilator 1a, the first exhaust ventilation device 1b, the second supply air ventilator 2a, and the second exhaust ventilation device 2b from the current state to perform forced exhaust and forced supply.

If the _CO2 concentration is less than the threshold (step S100: No), the control unit 3 acquires temperature and humidity information from the environment detection sensor 4a of the first supply air ventilation device 1a of the common room 100 and temperature and humidity information from the environment detection sensor 4b of the first exhaust air ventilation device 1b of the common room 100, and calculates a discomfort index based on the temperature and humidity information. The control unit 3 determines whether the calculated discomfort index is equal to or greater than a reference value (step S120).

If the discomfort index is equal to or greater than the reference value (step S120: Yes), the control unit 3 first determines whether the discomfort index is equal to or greater than the reference value due to temperature (step S130). If the indoor temperature is the cause (step S130: Yes), the control unit 3 compares the indoor temperature with the outdoor temperature (step S140). If the indoor temperature is higher than the outdoor temperature (step S140: Yes), the control unit 3 lowers the indoor temperature by increasing the airflow of the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b from the current level (step S160).

If the indoor temperature is lower than the outdoor temperature (step S140: No), the control unit 3 maintains the air volume of the first exhaust ventilation device 1b and the second exhaust ventilation device 2b at the preset first air volume, and stops the operation of the first supply ventilation device 1a and the second supply ventilation device 2a, thereby raising the indoor temperature (step S170).

If the indoor temperature is not the cause (step S130: No), the control unit 3 determines that the discomfort index is above the reference value due to humidity, and compares the indoor humidity with the outdoor humidity (step S150). If the indoor humidity is higher than the outdoor humidity (step S150: Yes), the control unit 3 lowers the indoor humidity by increasing the airflow of the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b from the current level (step S180).

If the indoor humidity is lower than the outdoor humidity (step S150: No), the control unit 3 maintains the airflow of the first exhaust ventilation device 1b and the second exhaust ventilation device 2b at a preset second airflow, and stops the operation of the first supply ventilation device 1a and the second supply ventilation device 2a, thereby increasing the indoor humidity (step S190). The second airflow may be the same as the first airflow, or it may be different. After steps S160, S170, S180, and S190, the procedure proceeds to step S120.

If the _CO2 concentration in the room is below the threshold value (step S100: No) and the discomfort index in the room is lower than the standard value (step S120: No), the control unit 3 controls the airflow of the first supply air ventilation device 1a, the first exhaust air ventilation device 1b, the second supply air ventilation device 2a, and the second exhaust air ventilation device 2b so as to operate normally (step S200).

If the indoor temperature and the outdoor temperature are equal in step S140, the control unit 3 maintains the current operating states of the first supply air ventilation device 1a, the first exhaust air ventilation device 1b, the second supply air ventilation device 2a, and the second exhaust air ventilation device 2b. Similarly, if the indoor humidity and the outdoor humidity are equal in step S150, the control unit 3 maintains the current operating states of the first supply air ventilation device 1a, the first exhaust air ventilation device 1b, the second supply air ventilation device 2a, and the second exhaust air ventilation device 2b. Also, in step S120, when the indoor discomfort index is greater than the reference value, the processing of steps S130 to S190 may be performed, and when the indoor discomfort index is equal to or less than the reference value, the processing of step S200 may be performed.

Furthermore, in normal operation in step S200, the control unit 3 controls the _airflow volumes of the first supply air ventilation device 1a, the first exhaust air ventilation device 1b, the second supply air ventilation device 2a, and the second exhaust air ventilation device 2b to be increased from the current levels if the _CO2 concentration increases from the current levels, and controls the airflow volumes of the first supply air ventilation device 1a, the first exhaust air ventilation device 1b, the second supply air ventilation device 2a, and the second exhaust air ventilation device 2b to be decreased from the current levels if the CO2 concentration decreases from the current levels.

The position of the environmental detection sensor 4a in the first supply air ventilation device 1a will be described with reference to FIG. 3. The environmental detection sensor 4a mounted on the first supply air ventilation device 1a detects information about the outdoor air taken into the common room 100. For this reason, it is necessary to place the environmental detection sensor 4a in a position in the path of the outdoor air and where it does not mix with the indoor air. Therefore, by attaching the environmental detection sensor 4a to the space B1 surrounded by the two-dot chain line from the intake port 23 that draws the outside air into the housing 20 to the fan 22, only outdoor air can be passed through the environmental detection sensor 4a, making it possible to accurately collect information about the outdoor air.

The position of the environmental detection sensor 4b in the first exhaust ventilation device 1b will be described with reference to FIG. 6. The environmental detection sensor 4b mounted on the first exhaust ventilation device 1b detects information about the indoor air in the common room 100. For this reason, it is necessary to place the environmental detection sensor 4b in a position where the indoor air passes through and does not mix with the outdoor air. Therefore, by attaching the environmental detection sensor 4b to the space B2 surrounded by the two-dot chain line from the decorative grill 34 that takes in indoor air into the housing 30 to the fan 32, only indoor air can pass through the environmental detection sensor 4b, making it possible to accurately collect information about the indoor air.

The action and effect of controlling the environment of the living room 200 based on the environmental detection sensors 4a and 4b arranged in the common room 100 will be explained in detail.

In the first supply air ventilation device 1a, outdoor environmental information is detected by an environmental detection sensor 4a mounted in the area where outdoor air flows in. Since the outdoor environmental information is common to the common room 100 and the living room 200 in the same building, the environmental detection sensor for detecting outdoor environmental information only needs to be installed in one location.

The first exhaust ventilation device 1b detects environmental information of the common room 100 using an environmental detection sensor 4b mounted in the area into which indoor air of the common room 100 flows in. Among the indoor environmental information, temperature and humidity are often common to multiple rooms.

Modern homes are highly insulated, and if ventilation is not performed in the summer, heat will build up and the temperature will be higher than outside. This situation is common to multiple rooms, so if the temperature information from the environmental detection sensors 4a, 4b installed in the common room 100 determines that the temperature inside is higher than outside, the common room 100 will be ventilated, and similar ventilation will be performed for the living room 200, improving comfort.

The same is true for humidity; when it rains, outdoor humidity is high, so it is desirable to stop the air supply. When the rain stops and the weather clears, outdoor humidity drops, so ventilation improves comfort. This humidity change situation is common to multiple rooms, so if the humidity information from the environmental detection sensors 4a, 4b in the common room 100 indicates that the humidity inside is higher than the outdoors, the common room 100 is ventilated, and similar ventilation is performed for the living room 200, improving comfort.

Regarding the _CO2 concentration, the conditions in the common room 100 and the living room 200 may differ depending on the installation conditions, so it is desirable to change the control.

In a building where many people live, such as a company, an office can be made to correspond to the common room 100, and a conference room to correspond to the living room 200. In a company, the number of people living there increases during the daytime on weekdays, resulting in a high _CO2 concentration, and the number of people living there decreases during weekday nights or on holidays, resulting in a low _CO2 concentration. This situation is common to offices and conference rooms, and there is a positive correlation between an increase in the number of people coming to work and an increase in the number of people in the office, and therefore an increase in the use of the conference room. Therefore, by similarly ventilating the conference room, which is the living room 200, with the _CO2 concentration of the office, which is the common room 100, an appropriate _CO2 concentration can be achieved, including the living room 200.

On the other hand, in a house, since the number of people living there is small, there may be a negative correlation between the number of people in multiple rooms. That is, at mealtimes, people gather in the living room corresponding to the common room 100, and the _CO2 concentration in the common room 100 increases, but at that time, the number of people in the bedroom, which is the living room 200, decreases, and the _CO2 concentration in the living room 200 decreases. Conversely, when the meal is over and people return to the bedroom, the _CO2 concentration in the common room 100 decreases and the _CO2 concentration in the living room 200 increases.

In this way, depending on the use of the building, there may be a positive correlation or a negative correlation between the _CO2 concentrations in multiple rooms. This correlation is determined by the use of the building. Therefore, by providing a _CO2 concentration control switch and making it possible to select between a positive correlation and a negative correlation, it becomes possible to perform appropriate ventilation. _{The CO2 concentration} control switch is a switch for selecting whether there is a positive correlation or a negative correlation between the common room 100, which is the first room, and the living room 200, which is the second room.

That is, for example, in a house, a negative correlation is selected by the _CO2 concentration control switch. At this time, when the _CO2 concentration in the common room 100 increases, the ventilation of the common room 100 is increased, but at the same time, the ventilation of the living room 200 is decreased. On the other hand, when the _CO2 concentration in the common room 100 decreases, the ventilation of the common room 100 is decreased, but at the same time, the ventilation of the living room 200 is increased. In other words, when the _CO2 concentration control switch is selected to a positive correlation and the _CO2 concentration increases from the current state, the control unit 3 increases the airflow of the first supply air ventilator 1a, the first exhaust air ventilator 1b, the second supply air ventilator 2a, and the second exhaust air ventilator 2b from the current state. On the other hand, when the _CO2 concentration control switch is selected to a negative correlation and the _CO2 concentration increases from the current level, the air volumes of the first supply air ventilator 1a and the first exhaust air ventilator 1b are increased from the current level, and the air volumes of the second supply air ventilator 2a and the second exhaust air ventilator 2b are decreased from the current level. Also, when the _CO2 concentration control switch is selected to a negative correlation and the _CO2 concentration decreases from the current level, the air volumes of the first supply air ventilator 1a and the first exhaust air ventilator 1b are decreased from the current level, and the air volumes of the second supply air ventilator 2a and the second exhaust air ventilator 2b are increased from the current level.

By controlling in this manner, it becomes possible to appropriately control the _CO2 concentrations in the common room 100 and the living room 200 using only the _CO2 sensor of the environment detection sensor 4b in the common room 100.

The _CO2 concentration control switch may be a physical switch provided in the control unit 3, or the operation of the control unit 3 may be set by a remote control or the like.

Furthermore, more appropriate control can be achieved by detecting the number of people present throughout the residence using a presence sensor, etc.

As described above, according to the ventilation system of the present embodiment, not only the air volume of the first supply air ventilator 1a and the first exhaust air ventilator 1b arranged in the common room 100 but also the air volume of the second supply air ventilator 2a and the second exhaust air ventilator 2b arranged in the living room 200 are controlled based on the detection information of the environment detection sensors 4a and 4b arranged in the common room 100, so that ventilation of multiple rooms can be made comfortable with low-cost and simple control. That is, the common room 100 in a house is assumed to be a living room where people are always present, and the living room 200 is assumed to be a bedroom or a child's room, and in that case, the place where the change in air quality occurs most is the common room 100, and it is necessary to improve the air quality of that room. Therefore, it is necessary to place the environment detection sensors 4a and 4b in the common room 100 for effective ventilation, and by ventilating the living room 200, which is another room, according to the air quality of the common room 100, the entire house can be ventilated efficiently. In addition, when the _CO2 concentration exceeds the threshold, forced exhaust and forced supply are performed at maximum airflow, so the indoor air can be purified in a short time, improving the comfort of the occupants. Furthermore, ventilation control is performed so that the indoor discomfort index falls below the standard value, improving the comfort of the occupants.

In addition, in this ventilation system, the detection information of the environmental detection sensors 4a and 4b may be accumulated and stored to determine whether periodic air pollution is occurring. If periodic air pollution is occurring, the air volume setting may be switched in advance to prevent air pollution in advance. It is also possible to install a control specification that works in conjunction with other electrical equipment to calculate the required ventilation volume and ventilate without wasting temperature adjustment by the air conditioner.

The configurations shown in the above embodiments are examples of the contents of this disclosure, and may be combined with other known technologies. Parts of the configurations may be omitted or modified without departing from the spirit of this disclosure.

1a First ventilation device for supplying air, 1b First ventilation device for exhausting air, 2a Second ventilation device for supplying air, 2b Second ventilation device for exhausting air, 3 Control unit, 4a, 4b Environment detection sensor, 20, 30 Housing, 21, 31 Motor, 22, 32 Fan, 23, 33 Intake port, 24 Intake air duct, 25, 35 Outlet port, 26, 36 Scroll casing, 34 Decorative grill, 100 Common room, 200 Living room.

Claims (4)

A ventilation system for ventilating a first room which is a common room shared by a plurality of people and a second room which is a living room partitioned separately from the first room,
a first supply air ventilation device provided in the first room and configured to supply outdoor air to the first room;
a first exhaust ventilation device provided in the first chamber and configured to exhaust air from the first chamber to the outside;
a second supply air ventilation device provided in the second room and configured to supply outdoor air to the second room;
a second exhaust ventilation device provided in the second chamber and configured to exhaust air from the second chamber to the outside;
A _CO2 concentration control switch for selecting whether there is a positive correlation or a negative correlation between the first chamber and the second chamber with respect to the CO2 _{concentration} ;
A control unit;
Equipped with
the first supply air ventilation device has a first environment detection sensor that detects an outdoor temperature and humidity;
The first exhaust ventilation device has a second environment detection sensor that detects a temperature, a humidity, and a _CO2 concentration in the first room,
The control unit is
a discomfort index for the first room is calculated based on the temperature and humidity acquired from the first environment detection sensor and the temperature and humidity acquired from the second environment detection sensor; if _the CO2 concentration is greater than a threshold value, the air volumes of the first supply air ventilator, the first exhaust air ventilator, the second supply air ventilator, and the second exhaust air ventilator are increased from the current levels to perform forced exhaust and forced supply, and the air volumes of the first supply air ventilator, the first exhaust air ventilator, the second supply air ventilator, and the second exhaust air ventilator are controlled so that the detected _CO2 concentration becomes smaller than the threshold value and the discomfort index for the first room becomes smaller than a reference value;
When _the CO2 concentration control switch is selected to a positive correlation and the CO2 _{concentration} increases from the current state, the air volumes of the first supply air ventilator, the first exhaust air ventilator, the second supply air ventilator, and the second exhaust air ventilator are increased from the current state, and when the CO2 concentration _control switch is selected to a negative correlation and the CO2 concentration increases from the current state, _the air volumes of the first supply air ventilator and the first exhaust air ventilator are increased from the current state, and the air volumes of the second supply air ventilator and the second exhaust air ventilator are decreased from the current state.
A ventilation system characterized by: The control unit is
When the discomfort index of the first room is greater than the reference value and the indoor temperature is higher than the outdoor temperature, the air volumes of the first supply air ventilator, the first exhaust air ventilator, the second supply air ventilator, and the second exhaust air ventilator are increased from the current state;
When the discomfort index of the first room is greater than the reference value and the indoor temperature is lower than the outdoor temperature, the air volumes of the first exhaust ventilation device and the second exhaust ventilation device are maintained at a predetermined first air volume, and the first supply ventilation device and the second supply ventilation device are stopped;
When the discomfort index of the first room is greater than the reference value and the indoor humidity is higher than the outdoor humidity, the air volumes of the first supply air ventilator, the first exhaust air ventilator, the second supply air ventilator, and the second exhaust air ventilator are increased from the current state,
The ventilation system described in claim 1, characterized in that when the discomfort index of the first room is greater than the reference value and the indoor humidity is lower than the outdoor humidity, the air volume of the first exhaust ventilation device and the second exhaust ventilation device is maintained at a predetermined second air volume, and the first supply air ventilation device and the second supply air ventilation device are stopped. The ventilation system according to claim 2 , wherein the first environment detection sensor is disposed in a space between an intake port for drawing in outside air in the first supply air ventilation device and a fan. 4. The ventilation system according to claim 2 , wherein the second environment detection sensor is disposed in a space between a decorative grill that takes in indoor air in the first exhaust ventilation device and a fan.

Images