JP2021011978A - Ventilation system - Google Patents

Abstract

To improve heat exchange efficiency of a total heat exchanger by enhancing a heat exchange air quantity ratio in the total heat exchanger when performing a first type of ventilation while recovering heat by using the total heat exchanger in a primary area and performing a third type of ventilation in a secondary area by supplying a part of air supplied to the primary area to the secondary area.SOLUTION: A ventilation system is configured to naturally supply a part of air supplied to a primary area in which a first type of ventilation is performed to a secondary area, and includes a control device executing exhaust air quantity control for changing exhaust air quantity EA2 from the secondary area in accordance with a use condition of the secondary area. In the exhaust air quantity control, the control device performs control by causing a primary side exhaust fan and a secondary side exhaust fan to cooperate with each other so as to reduce exhaust air quantity EA1 from the primary area when the exhaust air quantity EA2 from the secondary area is increased and increase the exhaust air quantity EA1 from the primary area when the exhaust air quantity EA2 from the secondary area is reduced.SELECTED DRAWING: Figure 3

Description

The present invention relates to a ventilation system that ventilates a building.

In buildings such as office buildings, first-class ventilation is performed by forced air supply and exhaust in the primary area such as the office, and the air supplied to the primary area in the secondary area such as the common area adjacent to the primary area. In some cases, a part of the natural air supply is used to perform type 3 ventilation by natural air supply and forced exhaust. Further, in this case, the exhaust heat is recovered by exchanging heat between the supply air and the exhaust gas with a total heat exchanger (see, for example, Patent Document 1) during the first-class ventilation of the primary area. There is.

Such a ventilation system is a total heat exchange between a primary air supply fan that supplies air to the primary area, a primary exhaust fan that exhausts air from the primary area, and air supply to the primary area and exhaust from the primary area. It is equipped with a exchanger and a secondary exhaust fan that exhausts air from the secondary area, and is configured to naturally supply a part of the air supplied to the primary area to the secondary area.

Japanese Unexamined Patent Publication No. 05-187675

By the way, in the above ventilation system, the amount of exhaust air from the primary area is taken into consideration in consideration of supplying a part of the air supplied to the primary area to the secondary area and exhausting it from the secondary area and the overall air balance. It is conceivable to set a certain amount smaller than the amount of air supplied to the primary area.
However, in that case, the exhaust air volume from the primary area will continue to be smaller by a certain amount than the air supply air volume to the primary area, and the heat exchange air volume ratio in the total heat exchanger (= from the primary area). (Exhaust air volume / air supply air volume to the primary area) decreases, causing a problem that the heat exchange efficiency of the total heat exchanger decreases.

In view of this situation, the main subject of the present invention is to perform first-class ventilation by forced air supply / exhaust while recovering heat with a total heat exchanger in the primary area, and to remove a part of the air supplied to the primary area. When supplying to the next area and performing type 3 ventilation by natural air supply and forced exhaust in the secondary area, increase the heat exchange air volume ratio in the total heat exchanger to improve the heat exchange efficiency of the total heat exchanger. The point is to provide a ventilation system that can.

The first characteristic configuration of the present invention is a primary side air supply fan that supplies air to a primary area that performs first-class ventilation by forced air supply / exhaust.
The primary exhaust fan that exhausts from the primary area and
A total heat exchanger that exchanges heat between the air supply to the primary area and the exhaust from the primary area.
It is equipped with a secondary exhaust fan that exhausts from the secondary area that performs type 3 ventilation by natural air supply and forced exhaust.
A ventilation system configured to naturally supply a part of the air supplied to the primary area to the secondary area.
A control device for executing exhaust air volume control that changes the exhaust air volume from the secondary area according to the usage status of the secondary area is provided.
In the exhaust air volume control, the control device reduces the exhaust air volume from the primary area when increasing the exhaust air volume from the secondary area, and reduces the exhaust air volume from the secondary area when the exhaust air volume from the secondary area is reduced. The point is that the primary side exhaust fan and the secondary side exhaust fan are interlocked and controlled so as to increase the exhaust air volume from the area.

According to the present invention, first-class ventilation is performed by forced air supply / exhaust while recovering heat with a total heat exchanger in the primary area, and a part of the air supplied to the primary area is supplied to the secondary area. Type 3 ventilation can be performed by natural air supply and forced exhaust in the secondary area.
Then, the control device executes exhaust air volume control that changes the exhaust air volume from the secondary area according to the usage status of the secondary area, and therefore adjusts the exhaust air volume to be suitable for the usage status of the secondary area at that time. be able to.
In addition, the control device controls the primary side exhaust fan and the secondary side exhaust fan in conjunction with each other in the exhaust air volume control, and reduces the exhaust air volume from the primary area when increasing the exhaust air volume from the secondary area. When the exhaust air volume from the secondary area is reduced, the exhaust air volume from the primary area is increased. Therefore, the exhaust air volume from the primary area is set to an appropriate air volume according to the exhaust air volume from the secondary area (for example, the whole). It can be adjusted to an air volume that does not significantly change the air balance.

In this way, by appropriately adjusting the exhaust air volume from the secondary area and the exhaust air volume from the primary area, wasteful exhaust from the secondary area can be reduced and the exhaust air volume from the primary area can be increased as much as possible. Can be maintained. Therefore, the heat exchange air volume ratio in the total heat exchanger (= exhaust air volume from the primary area / air supply air volume to the primary area) can be increased to improve the heat exchange efficiency of the total heat exchanger.

The second characteristic configuration of the present invention is that, in the exhaust air volume control, the control device sets the total air volume of the exhaust air volume from the secondary area and the exhaust air volume from the primary area as the air supply air volume to the primary area. The point is that the primary side exhaust fan and the secondary side exhaust fan are interlocked and controlled while maintaining the same air volume.

According to this configuration, in the above exhaust air volume control, the adjustment of the exhaust air volume from the primary area is adjusted to a more appropriate air volume (air volume that does not change the overall air balance) according to the exhaust air volume from the secondary area. This makes it possible to improve the heat exchange efficiency of the total heat exchanger described above while reliably maintaining the overall air balance.

In the third characteristic configuration of the present invention, the secondary area has a plurality of individual areas.
A detection unit for detecting whether or not each of the plurality of individual areas is used is provided.
In the exhaust air volume control, the control device has a smaller exhaust air volume from the secondary area as the usage rate of the plurality of individual areas as the usage status of the secondary area is lower, based on the detection result of the detection unit. The point is to control the secondary exhaust fan so as to be.

According to this configuration, in the exhaust air volume control, the lower the usage rate of the plurality of individual areas in the secondary area, the smaller the exhaust air volume from the secondary area can be, and the usage status of the secondary area at that time can be determined. The exhaust air volume can be adjusted to a suitable level with high accuracy.
Therefore, wasteful exhaust from the secondary area can be further reduced, the amount of exhaust air from the primary area can be maintained on the larger side, and the heat exchange efficiency of the total heat exchanger can be further improved.

In the fourth characteristic configuration of the present invention, the secondary area has a plurality of individual areas.
A detector that detects whether or not each of the plurality of individual areas is used,
An individual exhaust air volume control means for executing individual exhaust air volume control for changing individual exhaust air volumes from the plurality of individual areas based on the detection result of the detection unit is provided.
In the individual exhaust air volume control, the individual exhaust air volume control means changes the individual exhaust air volume from the individual area from 0 to the first exhaust air volume when the use of the individual area is started, and the individual exhaust air volume control means of the individual area. The first exhaust air volume is maintained from the start of use until the first reference time elapses, and after the first reference time elapses, the second exhaust air volume is changed to a larger one than the first exhaust air volume, and the individual area is concerned. The point is that it changes to 0 when the use of is finished.

According to this configuration, the individual exhaust air volume control means executes individual exhaust air volume control for changing individual exhaust air volumes from a plurality of individual areas based on the detection result of the detection unit, so that the situation of each individual area can be determined. The amount of exhaust air from each individual area can be adjusted accordingly.
According to this configuration, in the individual exhaust air volume control, the exhaust air volume from the individual area can be set to 0 before the start of use of the individual area and after the end of use of the individual area, which is wasteful. Exhaust can be reduced.
Further, the first exhaust air volume is maintained from the start of use of the individual area until the first reference time elapses, and after the first reference time elapses, the second exhaust air volume is changed to a larger one than the first exhaust air volume. Therefore, the exhaust air volume can be increased when the staying time is long as compared with the case where the staying time is short, and for example, ventilation of an individual area such as a personal toilet booth can be preferably performed.

In the fifth characteristic configuration of the present invention, the secondary area has a plurality of individual areas.
A detector that detects whether or not each of the plurality of individual areas is used,
An individual exhaust air volume control means for executing individual exhaust air volume control for changing individual exhaust air volumes from the plurality of individual areas based on the detection result of the detection unit is provided.
In the individual exhaust air volume control, the individual exhaust air volume control means maintains the exhaust air volume from the individual area at the third exhaust air volume while the individual area is not used, and the individual area is used. The point is to maintain a fourth exhaust air volume that is larger than the third exhaust air volume.

According to this configuration, the exhaust air volume from each individual area can be adjusted according to the situation of each individual area by controlling the individual exhaust air volume as in the fourth embodiment described above.
According to this configuration, in the individual exhaust air volume control, the exhaust air volume from the individual area is smaller than the fourth exhaust air volume while the individual area is used while the individual area is not used. The third exhaust air volume can be maintained, and wasteful exhaust can be reduced accordingly. Further, in this way, even when the individual area is not used, by maintaining the third exhaust air volume smaller than the fourth exhaust air volume, for example, a shared toilet or pantry wider than the individual individual booth can be shared. Ventilation of the space can be suitably performed.

Diagram showing the overall configuration of the ventilation system Flow chart showing the control flow of exhaust air volume control The figure which shows the relationship between the exhaust air volume of a primary area and the exhaust air volume of a secondary area in the exhaust air volume control. Time chart showing changes in individual exhaust air volume from individual areas in individual exhaust air volume control Planar layout showing another embodiment of the ventilation system A time chart showing changes in individual exhaust air volume from individual areas in individual exhaust air volume control according to another embodiment.

An embodiment of the ventilation system of the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, the ventilation system S is provided for each floor of a building such as an office building, and performs first-class ventilation by forced air supply / exhaust in a living room 1 such as an office room as a primary area A1. , Natural air supply and forced exhaust using a part of the air supplied to the living room 1 in the shared toilet 3 as the secondary area A2 adjacent to the living room 1 via the common corridor 2 etc. It is configured to perform type 3 ventilation by.

In this ventilation system S, a primary side air supply passage 4 in which a primary side air supply fan SF1 for supplying outside air to the living room 1 is arranged, and a primary side exhaust fan EF1 for exhausting the air in the living room 1 to the outside are arranged. A total heat exchanger 6 that exchanges heat between the primary side exhaust passage 5 and the air supply to the living room 1 passing through the primary side air supply passage 4 and the exhaust from the living room 1 passing through the primary side exhaust passage 5. , Is provided. The ventilation system S is in the form of recovering the sensible heat and latent heat of the exhaust from the outside by operating the primary side air supply fan SF1 and the primary side exhaust fan EF1 to supply air to the living room 1, and the first in the living room 1. It is configured to provide a kind of ventilation.

Further, the ventilation system S is provided with a secondary side exhaust passage 7 in which a secondary side exhaust fan EF2 for exhausting the air of the shared toilet 3 as the secondary area A2 to the outside is arranged. In the ventilation system S, the secondary side exhaust fan EF2 is operated to create a negative pressure environment for the shared toilet 3 with respect to the living room 1 and the common corridor 2, and a part of the air supplied to the living room 1 is shown in the figure. As shown by the white arrow in the above, the shared toilet 3 is configured to perform the third type ventilation in a form of sucking through the common corridor 2 and naturally supplying air to the shared toilet 3.

In the shared toilet 3, a plurality of toilet booths 3A are provided as a plurality of individual areas A2a. Then, on the upstream side of the secondary side exhaust fan EF2 in the secondary side exhaust passage 7, a plurality of first branch exhaust passages 7A for individually exhausting from each of the plurality of toilet booths 3A, and a hand-washing space in the shared toilet 3. A second branch exhaust passage 7B that exhausts air from the common space 3B in the toilet such as a passage or a passage is provided. The plurality of first branch exhaust passages 7A are provided with an electric damper D1 as individual exhaust air volume control means 13 capable of changing the individual exhaust air volume from each toilet booth 3A. Each toilet booth 3A in the shared toilet 3 is provided with a detection unit 8 for detecting whether or not the toilet booth 3A is used. The detection information by the detection unit 8 is sent to the control device 9, the damper D1, and the like.

The detection unit 8 can be configured by using a door open / close sensor that detects the open / closed state of the door (not shown) of the toilet booth 3A. In this case, for example, when the door open / close sensor detects that the door of the toilet booth 3A changes from the open state to the closed state, it is determined that a person has entered the toilet booth 3A and is being used, and the door is in the closed state. When the door open / close sensor detects that the toilet is open, it can be determined that a person has left the toilet booth 3A and is not in use.

In addition, the detection unit 8 can also be configured by using a motion sensor or the like that detects the presence of a person in the toilet booth 3A. In this case, for example, when the presence of a person in the toilet booth 3A is detected by a motion sensor, it is determined that a person has entered the toilet booth 3A and is being used, and from that state, the person in the toilet booth 3A When the presence is no longer detected by the motion sensor, it can be determined that a person has left the toilet booth 3A and is not in use.

The ventilation system S is provided with a control device 9 that controls the operation of each part of the ventilation system S. The control device 9 is configured to execute exhaust air volume control for changing the exhaust air volume EA2 from the shared toilet 3 according to the usage status of the shared toilet 3 as the secondary area A2. In the exhaust air volume control, the control device 9 reduces the exhaust air volume EA1 from the living room 1 when increasing the exhaust air volume EA2 from the shared toilet 3, and reduces the exhaust air volume EA2 from the shared toilet 3 when the exhaust air volume EA2 is decreased. The primary side exhaust fan EF1 and the secondary side exhaust fan EF2 are interlocked and controlled so as to increase the exhaust air volume EA1 from the air.
Hereinafter, the exhaust air volume control executed by the control device 9 will be described with reference to the flowchart of FIG. 2 and the table of FIG.

First, the usage status of the shared toilet 3 as the secondary area A2 is acquired (step # 01 in FIG. 2). Specifically, the detection results (detection information) of the detection unit 8 provided in each toilet booth 3A as the individual area A2a are acquired from the detection unit 8, and based on the detection results, a plurality of usage statuses of the shared toilet 3 are obtained. The usage rate of the toilet booth 3A (see FIG. 3, hereinafter referred to as individual area usage rate) is acquired. For example, the individual area usage rate can be obtained by calculating the ratio (ratio) of the number of toilet booths 3A in use to the total number of toilet booths 3A.

Next, based on the acquired individual area usage rate, the exhaust air volume EA2 from the shared toilet 3 as the secondary area A2 is set, and the exhaust air volume EA1 from the living room 1 as the primary area A1 is set. (Step # 02 of FIG. 2, FIG. 3).
For example, as shown in FIG. 3, the exhaust air volume EA2 from the shared toilet 3 as the secondary area A2 is set to decrease as the individual area usage rate decreases and increase as the individual area usage rate increases. That is, the exhaust air volume EA2 from the shared toilet 3 as the secondary area A2 is set to the smallest possible exhaust air volume according to the usage status of the shared toilet 3.

Further, as shown in FIG. 3, the exhaust air volume EA1 from the living room 1 as the primary area A1 increases as the exhaust air volume EA2 increases according to the exhaust air volume EA2 from the shared toilet 3 as the secondary area A2 (individual). It is set to decrease as the area usage rate increases, and increase as the exhaust air volume EA2 decreases (the lower the individual area usage rate). Specifically, in the exhaust air volume EA1 from the living room 1 as the primary area A1, the total air volume of the exhaust air volume EA1 and the exhaust air volume EA2 from the shared toilet 3 as the secondary area A2 is the living room as the primary area A1. It is set to be equivalent to the air supply air volume SA1 to 1. That is, the exhaust air volume EA1 from the living room 1 as the primary area A1 is set to the maximum exhaust air volume that does not change the air balance of the entire floor according to the exhaust air volume EA2 from the shared toilet 3 as the secondary area A2.

Then, the number of operating units and the rotation speed of the primary exhaust fan EF1 are controlled so that the exhaust air volume EA1 from the living room 1 as the primary area A1 becomes the set exhaust air volume, and from the shared toilet 3 as the secondary area A2. The number of operating units and the rotation speed of the secondary exhaust fan EF2 are controlled so that the exhaust air volume EA2 of the above becomes the set exhaust air volume. (Step # 03 in FIG. 2).

In this way, the control device 9 can adjust the exhaust air volume EA2 from the shared toilet 3 as the secondary area A2 to the smallest possible exhaust air volume according to the individual area usage rate at that time. Further, the control device 9 controls the primary side exhaust fan EF1 and the secondary side exhaust fan EF2 in conjunction with each other to share the exhaust air volume EA1 from the living room 1 as the primary area A1 as the secondary area A2. The air balance of the entire floor can be adjusted to be as large as possible according to the exhaust air volume EA2 from the toilet 3.

As shown in FIG. 3, when the air supply air volume SA1 to the primary area A1 is fixed, the larger the exhaust air volume EA1 from the primary area A1, the more the heat exchange air volume ratio (= EA1) in the total heat exchanger 6. / SA1) increases and the heat exchange efficiency of the total heat exchanger 6 improves. Therefore, as described above, the exhaust air volume EA2 from the secondary area A2 is set to the smallest possible exhaust air volume according to the individual area usage rate. By reducing unnecessary exhaust from the secondary area A2 and maintaining the exhaust air volume EA1 from the primary area A1 on the side as large as possible, the heat exchange air volume ratio (= EA1 /) in the total heat exchanger 6 is maintained. SA1) can be increased to improve the heat exchange efficiency of the total heat exchanger 6.

This ventilation system S not only controls the exhaust air volume from the entire shared toilet 3 as the secondary area A2, but also the individual toilet booths 3A as the individual area A2a based on the detection result of the detection unit 8. It is possible to perform individual exhaust air volume control that changes the individual exhaust air volume from.

Hereinafter, the individual exhaust air volume control executed by the individual exhaust air volume control means 13 will be described with reference to the time chart of FIG. In the time chart of FIG. 4, the left side shows the change in the individual exhaust air volume when a person enters the toilet booth 3A and exits with a staying time of the first reference time t1 or more, and the right side shows the change in the individual exhaust air volume when the person enters the toilet booth 3A. It shows the change of the individual exhaust air volume when entering the booth 3A and leaving the room with a stay time of less than the first reference time t1.

While the detection unit 8 does not detect the entry of a person into the toilet booth 3A as the individual area A2a, the individual exhaust air volume from the toilet booth 3A is maintained at 0. Then, when the detection unit 8 detects entry into the toilet booth 3A, the detection result is acquired by the damper D1 provided in the first branch exhaust passage 7A that exhausts from the toilet booth 3A, and the individual exhaust air volume is obtained. The control entry process is executed.

In this process at the time of entering the room, the damper D1 is changed to the open side posture (for example, the half-open posture), and the exhaust air volume from the toilet booth 3A is changed to the first exhaust air volume V1 (for example, 50%). Then, the posture of the damper D1 is maintained from the time when the entry into the toilet booth 3A is detected until the first reference time t1 elapses, and the exhaust air volume from the toilet booth 3A is maintained at the first exhaust air volume V1. ..
After that, when the first reference time t1 elapses, the damper D1 is further changed to the open side posture (for example, the fully open posture), and the exhaust air volume from the toilet booth 3A is larger than the first exhaust air volume V1. It is changed to V2 (for example, 100%).

When the detection unit 8 detects that a person has entered the toilet booth 3A and then the detection unit 8 detects that a person has left the toilet booth 3A, the individual exhaust air volume control processing at the time of leaving the room is executed. .. In this exit processing, the opening degree of the damper D1 is maintained as it is from the time when the exit of the person is detected until the second reference time t2 elapses. Then, when the second reference time t2 elapses, the damper D1 is changed to the closed side posture (for example, the fully closed posture), the exhaust air volume from the toilet booth 3A is changed to 0, and the exhaust air volume is maintained. ..

Therefore, the amount of exhaust air from the toilet booth 3A can be reduced to 0 before the start of use and after the use of the toilet booth 3A, and wasteful exhaust can be reduced accordingly. Further, the exhaust air volume can be increased when the staying time in the toilet booth 3A is long as compared with the case where the staying time in the toilet booth 3A is short, and the ventilation of each toilet booth 3A can be preferably performed.

When the above-mentioned individual exhaust air volume control is executed, the ventilation system S is, for example, a ratio (ratio) of the number of used toilet booths 3A to the total number of the exhaust air volume control executed by the control device 9. ) Is used as the individual area usage rate, but the actual total exhaust gas, which is the sum of the individual exhaust air volumes of the toilet booth 3A at that time, with respect to the maximum total exhaust air volume, which is the sum of the individual maximum exhaust air volumes for all the toilet booths 3A. The ratio (ratio) of the air volume can be used as the individual area usage rate.
In this way, it is possible to execute the exhaust air volume control of the primary area A1 and the secondary area A2 in consideration of the individual exhaust air volume control for each toilet booth 3A, and the wasteful exhaust air volume from the secondary area A2. The heat exchange efficiency of the total heat exchanger 6 can be further improved.

[Second Embodiment]
This second embodiment is different from the first embodiment mainly in the area division of the individual area A2a, the exhaust form from the individual area A2a, and the individual exhaust air volume control executed by the individual exhaust air volume control means 13. The points different from those of the first embodiment will be mainly described, and the common points with the first embodiment will be omitted.

As shown in FIG. 5, in the ventilation system S of the second embodiment, a plurality of individual areas A2a in the secondary area A2 are composed of a plurality of common spaces 11 partitioned from each other. In the illustrated example, the two shared spaces 11 on the left side and the center are shared toilets for men and women, and the one shared space 11 on the right side is a pantry.

Further, the ventilation system S is provided with secondary side individual exhaust passages 12 for exhausting air from each of the common spaces 11 as individual areas A2a, and a secondary side exhaust fan EF2 is provided in each of the secondary side individual exhaust passages 12. The constituent secondary side individual exhaust fan EF21 is provided. Further, the plurality of secondary side individual exhaust passages 12 are provided with an electric damper D2 as an individual exhaust air volume control means 13 capable of changing the individual exhaust air volume from each common space 11. In the second embodiment, the detection unit 8 provided in each common space 11 is configured by using a motion sensor that detects the presence of a person.

The ventilation system S changes the individual exhaust air volume from each common space 11 based on the detection result of the detection unit 8 as well as the exhaust air volume from the entire secondary area A2 composed of the plurality of common spaces 11. It is configured to perform exhaust air volume control.
Hereinafter, the individual exhaust air volume control executed by the individual exhaust air volume control means 13 will be described with reference to the time chart of FIG.

In the individual exhaust air volume control of the second embodiment, the exhaust air volume from the common space 11 is the third exhaust while the detection unit 8 does not detect the entry of a person into the common space 11 as the individual area A2a. The air volume is maintained at V3 (for example, 50%). Then, when the detection unit 8 detects that the room has entered the common space 11, the individual exhaust air volume control process at the time of entering the room is executed. In this room entry process, the damper D2 provided in the secondary side individual exhaust passage 12 of the common space 11 is changed to the open side posture, and the exhaust air volume from the common space 11 is larger than the third exhaust air volume V3. The fourth exhaust air volume is changed to V4 (for example, 100%) and maintained.

After the detection unit 8 detects the entry of a person into the common space 11, when the exit of the person from the common space 11 is detected, the individual exhaust air volume control processing at the time of leaving the room is executed. In this exit processing, the damper D2 is changed to the closed side posture, and the exhaust air volume from the common space 11 is changed to the third exhaust air volume V3 (for example, 50%) and maintained.

Therefore, while the common space 11 is not in use, the exhaust air volume from the common space 11 is maintained at the third exhaust air volume V3, which is smaller than the fourth exhaust air volume V4 while the common space 11 is in use. It is possible to reduce wasteful exhaust by that amount. Further, as described above, even when the common space 11 is not used, by maintaining the third exhaust air volume V3 which is smaller than the fourth exhaust air volume V4, it is possible to preferably ventilate the relatively wide common space 11. it can.

In the second embodiment as well, when the above-mentioned individual exhaust air volume control is executed, the ventilation system S has an individual maximum exhaust for, for example, the entire number of the toilet booths 3A in the exhaust air volume control executed by the control device 9. The ratio (ratio) of the actual total exhaust air volume, which is the sum of the individual exhaust air volumes of the toilet booth 3A at that time, to the maximum total exhaust air volume, which is the total air volume, can be used as the individual area usage rate.
In this way, it is possible to execute the exhaust air volume control of the primary area A1 and the secondary area A2 in consideration of the individual exhaust air volume control for each common space 11, and the wasteful exhaust air volume from the secondary area A2 can be reduced. It can be further reduced and the heat exchange efficiency of the total heat exchanger 6 can be further improved.

[Another Embodiment]
Other embodiments of the present invention will be described. The configurations of the respective embodiments described below are not limited to being applied independently, but can also be applied in combination with the configurations of other embodiments.

In the above embodiment, as an example, the control device 9 acquires the individual area usage rate and executes the exhaust air volume control of the secondary area A2 as the usage status of the secondary area A2. For example, the secondary area A2 is used. As the usage status of the area A2, the number of people existing in the secondary area A2 may be acquired and the exhaust air volume control of the secondary area A2 may be executed.

S Ventilation system A1 Primary area A2 Secondary area A2a Individual area EA1 Exhaust air volume from primary area EA2 Exhaust air volume from secondary area SA1 Air supply air volume to primary area SF1 Primary side air supply fan EF1 Primary side exhaust fan EF2 Secondary Side exhaust fan 6 Total heat exchanger 8 Detection unit 9 Control device 13 Individual exhaust air volume control means V1 1st exhaust air volume V2 2nd exhaust air volume V3 3rd exhaust air volume V4 4th exhaust air volume t1 1st reference time t2 2nd reference time

Claims (5)

A primary air supply fan that supplies air to the primary area that performs first-class ventilation by forced air supply and exhaust,
The primary exhaust fan that exhausts from the primary area and
A total heat exchanger that exchanges heat between the air supply to the primary area and the exhaust from the primary area.
It is equipped with a secondary exhaust fan that exhausts from the secondary area that performs type 3 ventilation by natural air supply and forced exhaust.
A ventilation system configured to naturally supply a part of the air supplied to the primary area to the secondary area.
A control device for executing exhaust air volume control that changes the exhaust air volume from the secondary area according to the usage status of the secondary area is provided.
In the exhaust air volume control, the control device reduces the exhaust air volume from the primary area when increasing the exhaust air volume from the secondary area, and reduces the exhaust air volume from the secondary area when the exhaust air volume from the secondary area is reduced. A ventilation system that controls the primary side exhaust fan and the secondary side exhaust fan in conjunction with each other so as to increase the amount of exhaust air from the area. In the exhaust air volume control, the control device maintains the total air volume of the exhaust air volume from the secondary area and the exhaust air volume from the primary area at the same air volume as the air supply air volume to the primary area. The ventilation system according to claim 1, wherein the primary side exhaust fan and the secondary side exhaust fan are interlocked and controlled. The secondary area has a plurality of individual areas.
A detection unit for detecting whether or not each of the plurality of individual areas is used is provided.
In the exhaust air volume control, the control device has a smaller exhaust air volume from the secondary area as the usage rate of the plurality of individual areas as the usage status of the secondary area is lower, based on the detection result of the detection unit. The ventilation system according to claim 1 or 2, wherein the secondary exhaust fan is controlled so as to be. The secondary area has a plurality of individual areas.
A detector that detects whether or not each of the plurality of individual areas is used,
An individual exhaust air volume control means for executing individual exhaust air volume control for changing individual exhaust air volumes from the plurality of individual areas based on the detection result of the detection unit is provided.
In the individual exhaust air volume control, the individual exhaust air volume control means changes the individual exhaust air volume from the individual area from 0 to the first exhaust air volume when the use of the individual area is started, and the individual exhaust air volume control means of the individual area. The first exhaust air volume is maintained from the start of use until the first set time elapses, and after the first reference time elapses, it is changed to the second exhaust air volume larger than the first exhaust air volume, and the individual area is concerned. The ventilation system according to any one of claims 1 to 3, which changes to 0 when the use of the exhaust system is finished. The secondary area has a plurality of individual areas.
A detector that detects whether or not each of the plurality of individual areas is used,
An individual exhaust air volume control means for executing individual exhaust air volume control for changing individual exhaust air volumes from the plurality of individual areas based on the detection result of the detection unit is provided.
In the individual exhaust air volume control, the individual exhaust air volume control means maintains the exhaust air volume from the individual area at the third exhaust air volume while the individual area is not used, and the individual area is used. The ventilation system according to any one of claims 1 to 3, wherein the interval is maintained at a fourth exhaust air volume larger than the third exhaust air volume.

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