JP7437552B2 - Ventilation systems and methods - Google Patents

Description

TECHNICAL FIELD The present invention relates to ventilation systems and ventilation methods.

In facilities where many people gather, such as offices and commercial facilities, it is necessary to provide adequate ventilation to maintain the comfort of the space. For example, when many people are active in a closed space, the indoor carbon dioxide concentration may rise and have a negative impact on people, so it is necessary to maintain indoor carbon dioxide concentration at a low level through proper ventilation. There is. Additionally, in recent years, interest in ventilation has increased from the perspective of infectious disease control.

For example, Patent Document 1 discloses a ventilation air volume control method for an air conditioner, which is characterized in that the volume of indoor air discharged outdoors is made larger than the volume of outdoor air supplied indoors. According to the technique disclosed in Patent Document 1, a pressure difference is created between the indoor and outdoor spaces, which makes it easier for air to flow into the room, so that the indoor space can be quickly ventilated.

Japanese Patent Application Publication No. 2005-83731

However, in conventional ventilation techniques such as Patent Document 1, the mixed distribution state of indoor air and outdoor air has not been sufficiently considered. As a result, indoor air and outside air were not sufficiently mixed, and sufficient ventilation was sometimes not achieved.

Therefore, there is a need for a ventilation system and ventilation method that can promote mixing of indoor air and outdoor air.

The ventilation system according to the present invention is a ventilation system that ventilates an indoor room of an office, and includes an outdoor air conditioner that takes in outside air from outside, and an outdoor air conditioner that is installed on the ceiling of the office and that discharges the outside air that the outdoor air conditioner has taken in into the room. a first discharge port; a second discharge port that is provided on the ceiling of the office and discharges outside air taken in by the outside air conditioner into the room; and a unit for the outside air taken in by the outside air conditioner from the first discharge port. a first state in which a first flow rate is discharged per unit time, and a second flow rate larger than the first flow rate is discharged per unit time of outside air taken in by the external air conditioner from the second discharge port; The outside air taken in by the outside air conditioner from the outlet is discharged at a third flow rate different from the first flow rate per unit time, and the outside air taken in by the outside air conditioner from the second outlet is discharged at the third flow rate per unit time. The apparatus is characterized by comprising a control means that generates turbulent flow in the chamber by repeating a second state in which a fourth flow rate smaller than the flow rate is discharged.

The ventilation method according to the present invention is a ventilation method for ventilating the interior of the office, including an outdoor air conditioner that takes in outside air from the outside of the office, and the ventilation method ventilates the inside of the office from a first outlet provided in the ceiling of the office. A first discharge step in which outside air taken in by the outside air conditioner is discharged into the room; and a second discharge step in which outside air taken in by the outside air conditioner is discharged into the room from a second outlet provided in the ceiling of the office. a discharge step, discharging the outside air taken in by the outside conditioning machine from the first discharge port at a first flow rate per unit time, and discharging the outside air taken in by the outside conditioning machine from the second discharge port at the first rate per unit time. a first state in which a second flow rate larger than the flow rate of generating turbulent flow in the room by repeating a second state in which the outside air taken in by the external air conditioner is discharged at a fourth flow rate smaller than the third flow rate per unit time from two discharge ports; It is characterized by including having.

According to these configurations, since the flow rates of air discharged from each of the first discharge port and the second discharge port are different from each other, the air flow is improved at the boundary of each area where the air discharged from the two discharge ports flows. becomes irregular. This may promote mixing of indoor air and outdoor air.

Further features and advantages of the invention will become clearer from the following description of exemplary and non-limiting embodiments, written with reference to the drawings.

1 is a system diagram of a ventilation system according to an embodiment. FIG. 1 is a block diagram of a ventilation system according to an embodiment.

Embodiments of a ventilation system and a ventilation method according to the present invention will be described with reference to the drawings. An example in which the ventilation system according to the present invention is applied to a ventilation system 1 provided for ventilating an office R will be described below.

[Ventilation system configuration]
The ventilation system 1 according to the present embodiment includes an outside air processing air conditioner 2 (hereinafter referred to as the outside air conditioner 2), a variable air volume device 3 (an example of a flow rate adjustment device), an outlet 4, a human sensor 5, and a control device. 6 (FIGS. 1 and 2). The ventilation system 1 ventilates the inside of the office R by discharging the outside air taken in from outside by the outdoor air conditioner 2 into the office R from the discharge port 4 and exhausting the air from the office R through the exhaust port (not shown). It is a system that

As the outside conditioning machine 2, a known outside conditioning machine can be used. The outside conditioner 2 includes a temperature controller 21 and a humidity controller 22 (both examples of density changing devices), and a blower 23. The outdoor conditioner 2 operates the temperature control device 21 and the humidity control device 22 to change the temperature and humidity of the air taken in from outside, thereby adjusting the temperature and humidity of the air supplied to the office R. The air, with or without temperature and humidity regulation, is energized by the blower 23.

The output of the outside conditioner 2 during rated operation can be appropriately set according to the scale of the office R (space volume, number of personnel, etc.). For example, if the output of the outdoor air conditioner 2 (blower 23) during rated operation is set according to the number of personnel, the flow rate of air supplied by the outdoor air conditioner 2 (outside air intake amount) The area may be determined to be 30 m ³ /h or more per person, but is not limited thereto. In this embodiment, as an example, an example in which the amount of outside air introduced during rated operation of the outside air conditioner 2 is 900 m ³ /h will be described.

As the variable air volume device 3, a known variable air volume device (sometimes referred to as VAV (Variable Air Volume)) can be used. In this embodiment, three paths are provided that branch downstream of the outdoor air conditioner 2, and a variable air volume device 3 is provided for each of the three paths. In the following description, when it is necessary to distinguish between the variable air volume devices 3, they will be referred to as a first variable air volume device 31, a second variable air volume device 32, and a third variable air volume device 33, respectively.

The discharge port 4 is provided so as to open from the ceiling of the office R toward the inside of the office R. In this embodiment, two discharge ports 4 are provided in each of three paths that branch downstream of the external conditioning machine 2, and six discharge ports 4 in total are provided. In the following description, when it is necessary to distinguish between the discharge ports 4 provided in each branch, the first discharge ports 41 (41a, 41b), the second discharge ports 42 (42a, 42b), and the second discharge ports 42 (42a, 42b) are used. They are called three discharge ports 43 (43a, 43b).

As the human sensor 5, a known human sensor can be used. The detection method may be an infrared method, an ultrasonic method, a visible light method, etc., but is not particularly limited. In this embodiment, one human sensor 5 is provided near each of the first discharge port 41, the second discharge port 42, and the third discharge port 43. In the following description, when it is necessary to distinguish between the human sensors 5, they will be referred to as a first human sensor 51, a second human sensor 52, and a third human sensor 53, respectively.

The control device 6 is configured as a known computer, and includes a computing device such as a CPU, a storage device such as a hard disk, an output device such as a display, an input device such as a keyboard, and a communication device such as a LAN module. Contains components. The control device 6 is capable of controlling the operations of the outdoor air conditioner 2 and the variable air volume device 3. Moreover, an electric signal is inputted from the human sensor 5 to the control device 6, and the control device 6 can recognize whether or not a person exists within the detection range of each human sensor 5.

The control device 6 can control the output of the blower 23 and the operating conditions of the temperature controller 21 and the humidity controller 22. Thereby, the control device 6 can control the flow rate (amount of outside air introduced), temperature, and humidity of the air supplied by the outside air conditioner 2. Further, the control device 6 can independently control the flow rate of air passing through each of the first variable air volume device 31, the second variable air volume device 32, and the third variable air volume device 33.

[Ventilation system control]
In the ventilation system 1 according to the present embodiment, the control device 6 executes (1) flow rate distribution control, (2) time distribution control, (3) density control, (4) pause control, and (5) ventilation promotion control. It is possible. The details of each control will be explained in turn.

(1) Flow rate distribution control In flow rate distribution control, the control device 6 controls the flow rate of air discharged from each of the first discharge port 41, the second discharge port 42, and the third discharge port 43 to be different from each other. Control as follows. Specifically, the flow rate of air passing through each of the first variable air volume device 31, the second variable air volume device 32, and the third variable air volume device 33 is controlled.

A reference flow rate serving as a reference for the flow rate of air discharged from each discharge port 4 is a value obtained by dividing the amount of outside air introduced during rated operation of the external air conditioner 2 by the number of discharge ports 4. For example, in this embodiment, the amount of outside air introduced during the rated operation of the external air conditioner 2 is 900 m ³ /h, and six discharge ports 4 are provided, so the reference flow rate of each discharge port 4 is 150 m ³ /h. It is h.

In the flow rate distribution control, the flow rate of air discharged from some of the plurality of discharge ports 4 is set to a value larger than the reference flow rate, and the flow rate of the discharged air is set to a value larger than the reference flow rate for some of the plurality of discharge ports 4. Set the flow rate to a value smaller than the reference flow rate. For example, the amount of air discharged from the first discharge port 41 is set to 75 m ³ /h (value smaller than the standard flow rate), the amount of air discharged from the second discharge port 42 is set to 150 m ³ /h, and the amount of air discharged from the third discharge port 43 is set to 75 m 3 /h (value smaller than the standard flow rate). The discharge amount is set to 225 m ³ /h (a value larger than the standard flow rate). In FIG. 1, differences in wind speed are schematically represented by arrows. At this time, the flow rate of air becomes uneven between the regions of the office R where the first discharge port 41, the second discharge port 42, and the third discharge port 43 are opened, and the air flow becomes uneven at the boundaries of each region. The flow becomes irregular. As a result, a turbulent flow T is generated inside the office R, so that air stagnation can be easily eliminated and ventilation of the office R can be promoted.

It is preferable that the flow rates of the air discharged from the different discharge ports 4 are different as in this embodiment, because mixing of the indoor air and the outside air is particularly likely to be promoted. This can be explained as follows.

なお、ρは空気の密度（単位：ｋｇ／ｍ^３）を表す。 The energy for stirring the indoor air in the office R is given as kinetic energy of the air flow discharged from the plurality of discharge ports 4. If the flow velocity of air discharged from a certain discharge port 4 is v [m/sec], and the opening area of the discharge port 4 is A [m ² ], then air from the discharge port 4 is discharged during a minute time Δt [h]. The mass m [kg] of air blown into the office R is expressed by the following equation (1).

Note that ρ represents the density of air (unit: kg/m ³ ).

Therefore, the kinetic energy K[J] input into the office R by the air discharged from the discharge port 4 is expressed by the following equation (2).

Assuming the above, the kinetic energy K1 input when three types of discharge ports 4 with different air volumes are provided as in the above embodiment, and the kinetic energy _K1 input when the air volume of each discharge port 4 is constant. Compare the kinetic energy _K2 . Note that the period for comparison is Δt [seconds].

If the wind speeds of the three types of discharge ports 4 are respectively v-Δv [m/sec], v [m/sec], and v+Δv [m/sec], the kinetic energy _K1 is expressed by the following equation (3). Ru. However, Δv is greater than 0 and less than or equal to v.

On the other hand, the kinetic energy _K2 when the air volume of each discharge port 4 is constant is expressed by the following equation (4).

Therefore, the difference in kinetic energy ΔK[W] between the two cases is expressed by the following equation (5).

Since Δv>0 in equation (5), ΔK>0. Therefore, the kinetic energy K ₁ when three types of discharge ports 4 having different air volumes are provided is larger than the kinetic energy K ₂ when the air volume of each discharge port 4 is constant. That is, by providing three types of discharge ports 4 with different air volumes as in this embodiment, more air is injected to agitate the indoor air in the office R than when the air volume of each discharge port 4 is constant. Since the amount of energy generated can be increased, stirring of indoor air can be promoted.

Furthermore, as is clear from equation (3), the larger Δv is, the larger the input kinetic energy _K1 is. Therefore, by setting Δv to a value substantially equal to v, the discharge port 4 whose discharge volume is set to be low is in an almost windless state, and the flow rate of air discharged from the discharge port 4 whose discharge volume is set to be high is the reference flow rate. From the viewpoint of increasing the input kinetic energy _K1 , it is ideal to have a value close to twice that of K1. However, in reality, it is necessary to determine the flow rate balance of each discharge port 4 to the extent that the heat balance within the office R is not disrupted. In addition, in some cases, the upper limit of the ventilation air speed is set by law in order to prevent the airflow from causing discomfort to people in the room, so it is necessary to determine the flow rate balance of each outlet 4 within the range of such upper limit. There is. For example, the building environmental hygiene management standards in Japan stipulate that the ventilation wind speed should be 0.5 meters per second or less.

(2) Time distribution control In time distribution control, the control device 6 changes the flow rate of air discharged from each of the first discharge port 41, the second discharge port 42, and the third discharge port 43 over time. Specifically, the flow rate of air passing through each of the first variable air volume device 31, the second variable air volume device 32, and the third variable air volume device 33 is changed over time.

In this embodiment, the flow rate of air passing through each of the first variable air volume device 31, the second variable air volume device 32, and the third variable air volume device 33 is a small flow rate (150 m ³ /h), a reference flow rate (300 m ³ /h), and large flow rate (450 m ³ /h) (examples of a plurality of predetermined levels). Note that the flow rates of air discharged from the discharge port 4 when each of the small flow rate, reference flow rate, and large flow rate are selected are 75 m ³ /h, 150 m ³ /h, and 225 m ³ /h, respectively.

The control device 6 changes the air flow rate of each of the first variable air volume device 31, the second variable air volume device 32, and the third variable air volume device 33 at predetermined time intervals (Table 1). For example, the state of the air flow rate of each discharge port 4 explained in the section of flow rate distribution control is that the first variable air volume device 31 has a small flow rate, the second variable air volume device 32 has a reference flow rate, and the third variable air volume device 32 has a low flow rate. The device 33 is in a state of high flow (Table 1: first period). After operating in this state for a predetermined period, the first variable air volume device 31 is changed to the standard flow rate, the second variable air volume device 32 is changed to a large flow rate, and the third variable air volume device 33 is changed to a small flow rate. (Table 1: Second period). After further operating in this state for a predetermined period, the first variable air volume device 31 is changed to a large flow rate, the second variable air volume device 32 is changed to a small flow rate, and the third variable air volume device 33 is changed to a reference flow rate. (Table 1: third period), and returns to the initial state after the next predetermined period.

Table 1: Example of change in air flow rate over time (unit: m ³ /h)

By changing the air flow rate over time in this way, the airflow becomes non-uniform inside the office R, so air stagnation can be easily eliminated and ventilation of the office R can be promoted.

Note that the flow rate distribution control and the time distribution control are preferably used together. In the above example, flow rate distribution control is performed both before and after changing the air flow rates of the three variable air volume devices 3. In this way, by using both the flow rate distribution control and the time distribution control, ventilation of the office R can be further promoted.

(3) Density Control In density control, the control device 6 changes the density of air discharged from the discharge port 4. Specifically, there is a method of controlling the temperature controller 21 to change the temperature of the air supplied from the outside air conditioner 2, and a method of controlling the humidity controller 22 to change the humidity of the air supplied from the outside air conditioner 2. Examples include methods to do so, and their combinations. In either example, since the density of the air supplied from the external air conditioner 2 is changed, the density of the air discharged from each discharge port 4 is uniform.

For example, if the temperature controller 21 is used to heat the air supplied from the outdoor air conditioner 2 so that air at a temperature higher than the room temperature of the office R is supplied, the density of the air discharged from the discharge port 4 is becomes smaller than the density of the air originally existing in office R. At this time, the air discharged from the discharge port 4 promotes agitation of the air above the office R in the height direction. On the other hand, if air with a temperature lower than the room temperature of Office R is supplied, the density of the air discharged from the outlet 4 will be greater than the density of the air inside Office R, so that Air agitation on the sides is promoted. The temperature range of the air controlled in the density control can be set, for example, between the blowout temperature of the outdoor air conditioner 2 and the indoor set temperature of the office R, and within a range of 5°C, but is limited to this range. Not done.

In this way, depending on the relationship between the temperature of the air supplied from the outside air conditioner 2 and the room temperature of the office R, the position in the height direction in which air agitation is promoted in the office R can be adjusted. For example, by changing the temperature of the air supplied from the outdoor air conditioner 2 at predetermined intervals, ventilation throughout the height of the office R is promoted. Note that in the method using the humidifier 22, similar control can be performed using the density decrease due to humidification and the density increase due to dehumidification.

(4) Pause Control In the pause control, the control device 6 controls the variable air volume device 3 to reduce the flow rate of air discharged from the discharge port 4 associated with the human sensor 5 that is not detecting the presence of a person. control. In the following, an example will be explained in which the first person sensor 51 and the second person sensor 52 detect the presence of a person, and the third person sensor 53 does not detect the presence of a person (FIG. 1). do.

The control device 6 performs control to reduce the flow rate of air discharged from the third outlet 43 associated with the third person sensor 53 that is not detecting the presence of a person. Specifically, the flow rate of air passing through the third variable air volume device 33 is reduced or the third variable air volume device 33 is closed.

At this time, unless the output of the blower 23 is changed, the total flow rate of air discharged from all the discharge ports 4 does not change. Therefore, as the flow rate of air discharged from the third discharge port 43 decreases, the flow rate of air discharged from the first discharge port 41 and the second discharge port 42 increases. That is, the control device 6 performs control to reduce the flow rate of air passing through the third variable air volume device 33 and at the same time controls the output of the blower 23 so that the output of the blower 23 does not change. The flow rate of air discharged from the first outlet 41 and the second outlet 42 associated with the person sensor 51 and the second person sensor 52 increases. Table 2 shows examples of changes in the flow rate of air discharged from each discharge port 4 before and after performing control to reduce the flow rate of air discharged from the third discharge port 43.

注：第一吐出口４１、第二吐出口４２、および第三吐出口４３が二つずつ設けられているため、「合計」欄の数値は各吐出口４の流量の和の２倍になる。 Table 2: Example of change in air flow rate (unit: m ³ /h)

Note: Since two first discharge ports 41, two second discharge ports 42, and two third discharge ports 43 are provided, the value in the "Total" column is twice the sum of the flow rates of each discharge port 4. .

This control further promotes ventilation in the area where people are present (the area where the first outlet 41 and the second outlet 42 are open). That is, the energy consumed for ventilation can be concentrated in areas where people are present, and the efficiency of ventilation in areas where people are present can be improved without increasing the total energy consumption.

Alternatively, the output of the blower 23 may be changed to reduce the amount of outside air introduced (the total flow rate of each discharge port 4) by the amount that the flow rate of air discharged from the third discharge port 43 is reduced. That is, the control device 6 performs control to reduce the flow rate of air passing through the third variable air volume device 33 and simultaneously performs control to reduce the output of the blower 23. However, this control is preferably performed within a range in which the flow rate of air discharged from the first discharge port 41 and the second discharge port 42 does not decrease. Table 3 shows examples of changes in the flow rate of air discharged from each discharge port 4 before and after performing control to reduce the flow rate of air discharged from the third discharge port 43.

注：第一吐出口４１、第二吐出口４２、および第三吐出口４３が二つずつ設けられているため、「合計」欄の数値は各吐出口４の流量の和の２倍になる。 Table 3: Example of change in air flow rate (unit: m ³ /h)

Note: Since two first discharge ports 41, two second discharge ports 42, and two third discharge ports 43 are provided, the value in the "Total" column is twice the sum of the flow rates of each discharge port 4. .

In this case, while maintaining ventilation efficiency in the area where people are present (the area where the first outlet 41 and the second outlet 42 are open), the output of the outdoor air conditioner 2 is reduced, and the ventilation system 1 Overall energy consumption can be reduced.

(5) Ventilation promotion control In ventilation promotion control, the control device 6 increases the flow rate of air discharged from the outlet 4 associated with the human sensor 5 that is not detecting the presence of a person, and The variable air volume device 3 is controlled so as not to reduce the flow rate of air discharged from the discharge port 4. In the following, similarly to the explanation of pause control, the first human sensor 51 and the second human sensor 52 are detecting the presence of a person, and the third human sensor 53 is in a state where the presence of a person is not detected. (FIG. 1) will be explained as an example.

The control device 6 performs control to increase the flow rate of air discharged from the third outlet 43 associated with the third person sensor 53 that is not detecting the presence of a person. However, at this time, control is performed so that the flow rate of air discharged from the first discharge port 41 and the second discharge port 42 does not decrease. In order to satisfy these two conditions, control is performed to at least change the output of the blower 23 to increase the amount of outside air introduced (the total flow rate of each discharge port 4). Note that control to adjust the opening degree of each variable air volume device 3 may be performed at the same time, but this control is limited to the extent that the flow rate of air discharged from the third discharge port 43 increases compared to before the control is executed. It will be done. Table 4 shows examples of changes in the flow rate of air discharged from each discharge port 4 before and after the control is performed.

注：第一吐出口４１、第二吐出口４２、および第三吐出口４３が二つずつ設けられているため、「合計」欄の数値は各吐出口４の流量の和の２倍になる。 Table 4: Example of change in air flow rate (unit: m ³ /h)

Note: Since two first discharge ports 41, two second discharge ports 42, and two third discharge ports 43 are provided, the value in the "Total" column is twice the sum of the flow rates of each discharge port 4. .

This control increases the air volume in the area where no person is present (the area where the third discharge port 43 is open). In areas where no people are present, an increase in wind speed is allowed because the airflow has less of an effect on the discomfort of people in the room. Therefore, under the above-mentioned conditions after execution of the control, by increasing the air volume only in areas where no people are present, it is possible to increase the amount of outside air introduced in a manner that does not cause discomfort to people in the room. Thereby, it is possible to increase the kinetic energy introduced for stirring the indoor air in the entire office R while maintaining comfort.

Furthermore, when performing cooling operation under conditions where the outside temperature is lower than the indoor temperature, the air conditioning load can be reduced by increasing the amount of outside air introduced (so-called outside air cooling). However, outside air cooling requires securing the amount of outside air introduced to obtain a sufficient cooling effect, and ensuring the amount of air that can sufficiently agitate the indoor air without impairing indoor comfort. The challenge is that it is difficult to balance both. According to the ventilation promotion control according to the present embodiment, the amount of outside air introduced can be increased while maintaining comfort, and the kinetic energy introduced for stirring the indoor air can be increased, so the outside air cooling can be increased. Easier to hire. Therefore, by combining ventilation promotion control and outside air cooling, the air conditioning load can be reduced.

Note that the flow rate of air discharged from the discharge ports 4 associated with the human sensor 5 that is not detecting the presence of a person decreases in the pause control, and increases in the ventilation promotion control. Since the behavior of these two controls is diametrically opposed, they cannot be executed simultaneously. However, this does not prevent the control device 6 from being able to execute both pause control and ventilation promotion control. In this case, appropriate control can be selected depending on various conditions such as the season and the number of people in the office R.

[Other embodiments]
Finally, other embodiments of the ventilation system and ventilation method according to the present invention will be described. Note that the configurations disclosed in each of the embodiments below can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction occurs.

In the above embodiment, a configuration in which three variable air volume devices 3 and six discharge ports 4 are provided has been described as an example. However, in the ventilation system according to the present invention, the number of flow rate regulators and discharge ports is not particularly limited as long as at least two discharge ports (at least a first discharge port and a second discharge port) are provided. It can be set as appropriate depending on the size of the room (space volume, number of people, etc.).

In the above embodiment, the configuration in which two discharge ports 4 correspond to one variable air volume device 3 has been described as an example. However, in the ventilation system according to the present invention, the correspondence relationship between the flow rate adjustment device and the discharge port is not particularly limited. For example, a flow rate adjustment device and a discharge port may correspond to each other on a one-to-one basis, or one flow rate adjustment device may correspond to three or more discharge ports. Moreover, when a plurality of flow rate adjustment devices are provided, the number of discharge ports corresponding to each flow rate adjustment device may be the same or different from each other.

In the above embodiment, the control device 6 has a configuration capable of executing (1) flow rate distribution control, (2) time distribution control, (3) density control, (4) pause control, and (5) ventilation promotion control. Explained as an example. However, in the ventilation system according to the present invention, control other than flow rate distribution control is optional.

In the above embodiment, the configuration in which outside air is taken in from outside by the outdoor air conditioner 2 has been described as an example. However, in the ventilation system according to the present invention, the method of taking in outside air is not particularly limited, and any ventilation/air blowing equipment with a power source such as an outside air processing package air conditioner, a ventilation device with a total heat exchanger, an outside air intake blower, etc. can be used. sell. Furthermore, when using an external air conditioner, the specifications of each part thereof (double coil or single coil, hot gas bypass reheating, electric heater reheating, etc.) are not limited.

In the above embodiment, the configuration in which the variable air volume device 3 is provided as the flow rate adjustment device has been described as an example. However, in the ventilation system according to the present invention, the flow rate adjustment device is not limited to a variable air volume device, and may be, for example, a motor damper (MD), an inverter-controlled fan, or the like.

In the above embodiment, the configuration in which the discharge port 4 opens from the ceiling of the office R toward the inside of the office R has been described as an example. However, the manner in which the outlet is installed is not particularly limited, and the outlet may be opened in a wall or floor, for example. Further, various conditions such as the shape of the ejection port and the attraction ratio are not particularly limited. However, the shape of the discharge port is preferably selected within a range that does not excessively reduce the speed of the blown air.

In the above embodiment, the flow rate of air passing through each variable air volume device 3 is divided into three levels: a small flow rate (150 m ³ /h), a standard flow rate (300 m ³ /h), and a large flow rate (450 m ³ /h). The explanation has been given using a configuration controlled by . However, in the ventilation system according to the present invention, the flow rate of air passing through the flow regulating device may be controlled in stages or continuously. Furthermore, in the case of stepwise control, the number of levels to be set is not particularly limited.

Regarding other configurations, it should be understood that the embodiments disclosed in this specification are illustrative in all respects, and the scope of the present invention is not limited thereby. Those skilled in the art will easily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Therefore, other embodiments that are modified without departing from the spirit of the present invention are naturally included within the scope of the present invention.

INDUSTRIAL APPLICATION This invention can be utilized for the ventilation system used, for example in an office, a commercial facility, etc.

1: Ventilation system 2: Outside air processing air conditioner (outside air conditioner)
21: Temperature controller 22: Humidity controller 23: Blower 3: Variable air volume device 31: First variable air volume device 32: Second variable air volume device 33: Third variable air volume device 4: Discharge port 41: First discharge port 42 : Second discharge port 43 : Third discharge port 5 : Human sensor 51 : First human sensor 52 : Second human sensor 53 : Third human sensor 6 : Control device R : Office T : Turbulent flow

Claims (8)

In ventilation systems that ventilate office rooms,
An outdoor air conditioner that takes in air from outside,
a first discharge port provided in the ceiling of the office for discharging outside air taken in by the outdoor air conditioner into the room;
a second outlet that is provided in the ceiling of the office and discharges outside air taken in by the outdoor air conditioner into the room;
The outside air taken in by the outside conditioning machine from the first discharge port is discharged at a first flow rate per unit time, and the outside air taken in by the outside conditioning machine from the second discharge port is higher than the first flow rate per unit time. A first state in which a second flow rate is discharged, and a third flow rate different from the first flow rate is discharged per unit time of the outside air taken in by the external air conditioner from the first discharge port, and the outside air is discharged from the second discharge port. and a second state in which the outside air taken in by the outside air conditioner is discharged at a fourth flow rate smaller than the third flow rate per unit time, thereby generating turbulent flow in the room. A ventilation system featuring: The control means is characterized in that the flow rate to be discharged per unit time from the first discharge port and the flow rate to be discharged per unit time from the second discharge port are selected from a plurality of preset criteria. The ventilation system according to claim 1. The ventilation system according to claim 1 or 2, further comprising a temperature control device that changes the temperature of the air supplied from the external air conditioner to the first discharge port and the second discharge port. 4. The apparatus according to claim 1, further comprising a humidity controller that changes the humidity of the air supplied from the external air conditioner to the first discharge port and the second discharge port. ventilation system. a first person sensor that corresponds to an area where air is discharged from the first discharge port and detects the presence of a person; and a second human sensor that corresponds to an area where air is discharged from the second discharge port and detects the presence of a person. The ventilation system according to any one of claims 1 to 4, further comprising a two-person sensor. A claim characterized in that the control means increases the flow rate to be discharged per unit time from the discharge port corresponding to the human sensor that detects the presence of a person among the first human sensor or the second human sensor. Ventilation system according to item 5. A claim characterized in that the control means increases the flow rate discharged per unit time from a discharge port corresponding to a human sensor that does not detect the presence of a person among the first human sensor or the second human sensor. Ventilation system according to item 5. A ventilation method for ventilating the interior of the office, comprising an outdoor air conditioner that takes in outside air from outside the office,
a first discharge step of discharging the outside air taken in by the outdoor air conditioner into the room from a first discharge port provided in the ceiling of the office;
a second discharge step of discharging the outside air taken in by the outdoor air conditioner into the room from a second discharge port provided in the ceiling of the office;
The outside air taken in by the outside conditioning machine from the first discharge port is discharged at a first flow rate per unit time, and the outside air taken in by the outside conditioning machine from the second discharge port is higher than the first flow rate per unit time. A first state in which a second flow rate is discharged, and a third flow rate different from the first flow rate is discharged per unit time of the outside air taken in by the external air conditioner from the first discharge port, and the outside air is discharged from the second discharge port. and a second state in which the outside air taken in by the outside air conditioner is discharged at a fourth flow rate smaller than the third flow rate per unit time, thereby generating turbulent flow in the room. Characteristic ventilation method.

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