JP2019015436A - Air conditioning system - Google Patents

Abstract

To perform outside air cooling in a state where an outside air introduction amount can be adjusted even in a small range, while performing introduction of the outside air efficiently, and to achieve improvement in energy saving.SOLUTION: An air conditioning system includes: an outside air introduction amount adjustment part 4 capable of adjusting an outside air introduction amount which is introduced in an outside air introduction part 1; and an air amount control part 5 for controlling the outside air introduction amount adjustment part 4 so that the outside air introduction amount becomes an outside air request air amount according to a load state of an air conditioning target space 2. The outside air introduction amount adjustment part 4 includes: a variable air amount fan 12; and a small air amount adjustment part 13 which can adjust to an air amount smaller than an air amount adjustment range of the variable air amount fan 12. In the case where the outside air request air amount is equal to or greater than a preset value, the air amount control part 5 controls the outside air introduction amount adjustment part 4 so as to control the rotation speed of the variable air amount fan 12, and in the case where the outside air request air amount is below the preset value, it brings the rotation speed of the variable air amount fan 12 to the constant preset rotation speed and controls the outside air introduction amount adjustment part 4 so as to control the small air amount adjustment part 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air conditioning system including an outside air introduction unit that introduces outside air, and an air conditioner that can supply the outside air introduced by the outside air introduction unit as air-conditioned air to a space to be conditioned.

  In the air conditioning system as described above, the air conditioner cools the air-conditioning target space by supplying the outside air introduced by the outside air introduction unit as air-conditioned air to the air-conditioning target space (for example, Patent Document 1, 2). Outside air cooling is not always performed, but the outside air cooling permission condition is set based on the temperature and humidity of the air-conditioning target space and the temperature and humidity of the outside air. When the outside air cooling permission condition is satisfied, the outside air cooling is performed. I have to.

  In the system described in Patent Document 1, the outside air introduced by the outside air introduction unit can be supplied to a plurality of rooms (air-conditioning target spaces), and an air conditioner is provided in each of the plurality of rooms. An air supply fan is provided to adjust the amount of outside air introduced by the outside air introduction section. By controlling the rotation speed of the air supply fan according to the number of rooms that perform outdoor air cooling among the plurality of rooms, the amount of outside air introduced is adjusted according to the load state of the plurality of rooms.

  In the system described in Patent Document 2, outside air introduced by the outside air introduction unit can be supplied to a plurality of rooms (air-conditioning target spaces), and a VAV unit that can adjust the amount of outside air supplied to each of the plurality of rooms is adjustable. Is provided. In order to adjust the amount of outside air introduced by the outside air introduction unit, a VAV unit for taking in outside air is provided. The outside air introduction amount is adjusted according to the load state of the plurality of rooms by controlling the VAV unit for taking in outside air based on the total requested air volume obtained by summing the requested air volumes in the plurality of rooms.

Japanese Patent Application Laid-Open No. 2014-115056 Japanese Patent No. 4346295

  In the system described in Patent Literature 1, the amount of outside air introduced is adjusted by controlling the rotation speed of the air supply fan. However, since the minimum air volume that can be adjusted by the air supply fan is defined and the minimum air volume is a relatively large air volume, the outside air introduction amount cannot be adjusted to a small range. Thereby, for example, when it is necessary to adjust the outside air introduction amount to a small range due to a decrease in the load of the air conditioning target space, the outside air cannot be cooled. Therefore, it is necessary to set the outside air cooling permission condition in a narrow range, the outside air cooling cannot be fully utilized, and it is difficult to improve the energy saving performance.

  Incidentally, in Patent Document 1, it is described that, in adjusting the amount of outside air introduced, the opening control of the supply air damper may be combined with the control of the rotation speed of the supply air fan. However, it does not describe how to specifically combine the opening control of the air supply damper.

  In the system described in Patent Document 2, the amount of outside air introduced is adjusted by controlling the outside air intake VAV unit. However, the VAV unit for taking in outside air adjusts the amount of outside air introduced by restricting the opening of a damper or the like to provide resistance. Therefore, the VAV unit for taking in outside air resists against the introduction of outside air. Therefore, it is difficult to efficiently introduce the outside air, which may increase the energy consumption.

  Incidentally, Patent Document 2 describes that an outside air fan is provided if necessary in addition to a VAV unit for taking in outside air. However, it does not describe how to control the outside air fan when the outside air fan is provided.

  In view of this situation, the main problem of the present invention is that the outside air cooling can be performed in a state in which the outside air introduction amount can be adjusted to a small range while efficiently introducing the outside air, and energy saving can be improved. The point is to provide an air conditioning system.

The first characteristic configuration of the present invention includes an outside air introduction section for introducing outside air,
An air conditioner that can freely supply the outside air introduced in the outside air introduction section to the air-conditioned space as conditioned air;
An outside air introduction amount adjustment unit capable of adjusting the outside air introduction amount introduced by the outside air introduction unit; and
An air volume control unit that controls the outside air introduction amount adjustment unit so that the outside air introduction amount becomes a required outside air amount according to a load state of the air-conditioning target space;
The outside air introduction amount adjustment unit includes a variable air volume fan and a small air volume adjustment unit that is adjustable to an air volume smaller than an air volume adjustment range of the variable air volume fan,
The air volume control unit controls the outside air introduction amount adjusting unit in a form of controlling the rotation speed of the variable air volume fan when the outside air required air volume is equal to or larger than a set value, and the outside air requested air volume is less than the set value. In this case, the outside air introduction amount adjustment unit is controlled in such a manner that the rotation speed of the variable air volume fan is set to a constant set rotation speed and the small air volume adjustment unit is controlled.

  According to this configuration, the air volume control unit controls the rotational speed of the variable air volume fan according to the outside air required air volume when the outside air requested air volume is equal to or greater than the set value, and thus does not give resistance to the introduced outside air. The amount of outside air introduced can be adjusted to the required amount of outside air according to the load state of the air conditioning target space. In addition, even if the outside air required air volume becomes less than the set value due to a decrease in the load of the air-conditioning target space, etc., and the air volume control unit becomes a small air volume that cannot be adjusted by the variable air volume fan, the air volume control unit rotates the variable air volume fan at a constant rotation speed By setting the speed and controlling the small air volume adjustment unit according to the external air required air volume, the external air introduction amount can be adjusted to the external air required air volume. Therefore, since the amount of outside air introduced can be adjusted to a small range, for example, the outside air cooling permission condition can be set in a wide range.

  From the above, it is possible to perform outside air cooling while the outside air introduction amount can be adjusted to a small range while efficiently introducing outside air, so that the outside air cooling can be fully utilized to improve energy saving. be able to.

In the second characteristic configuration of the present invention, the air-conditioning target space is divided into a plurality of areas,
The air conditioner is provided in each of a plurality of areas, and is configured to be able to supply air that has been air-conditioned by the air-conditioning processing unit to return air from the area as air-conditioned air in addition to outside air,
The outside air introduction unit is configured to introduce outside air to a plurality of areas and be freely supplied to each of the plurality of air conditioners.
Each of the plurality of areas is provided with an area air volume adjustment unit capable of adjusting the amount of outside air supplied to the air conditioner,
The air volume control unit controls the outside air introduction amount adjustment unit so that the entire outside air introduction amount in the plurality of areas becomes the outside air required air volume according to the load state in the plurality of areas as a whole. The area air volume adjustment unit is configured to be controllable according to the load state.

  According to this configuration, the outside air introduction unit introduces outside air for a plurality of areas and supplies the outside air to each of the plurality of air conditioners provided in each area. To cool the outside air in each area. Since the outside air introduction unit concentrates and introduces outside air for a plurality of areas, the configuration can be shared and the configuration can be simplified rather than introducing outside air for each area separately. In addition, the air volume control unit not only controls the outside air introduction amount adjustment unit so that the entire outside air introduction amount in the plurality of areas becomes the outside air required air volume corresponding to the load state in the plurality of areas as a whole, Since the area air volume adjustment unit is controlled according to the load state of each area, the entire outside air introduction amount also corresponds to the entire load state while ensuring the outside air supply amount according to the individual area load state for each area. It can be adjusted to the required outside air volume. As for the entire outside air introduction amount, as described in the first feature configuration, the entire outside air introduction amount can be adjusted to a small range. For example, the outside air cooling permission condition is set to a wide range. The outdoor air cooling for a plurality of areas can be fully utilized to improve the energy saving performance.

  According to a third characteristic configuration of the present invention, when the air flow control unit controls the area air flow adjustment unit to the minimum side of the outside air supply amount, there is an area in which the air conditioning state is larger than the area individual load. Area priority control for controlling the outside air introduction amount adjusting unit so as to adjust the whole outside air introduction amount in a plurality of areas to the lower side in order to make the outside air supply amount to the area an air amount according to the individual load. Is configured to be executable.

  Even if the area air volume adjustment unit is controlled to the minimum side of the outside air supply amount, if there is an area where the air-conditioning state exceeds the area individual load, the outside air is being cooled excessively, such as overcooling It becomes. Therefore, according to the present configuration, in such a case, the air volume control unit sets a plurality of areas so that the outside air supply amount to the area that is larger than the area individual load is the air volume according to the area individual load. The area priority control for controlling the outside air introduction amount adjusting unit is executed so as to adjust the whole outside air introduction amount to the lower side. As a result, the entire outside air introduction amount is adjusted to the lower side, and the outside air supply amount to the area becomes the air amount according to the individual load of the area, so that the state where excessive outside air cooling is performed such as overcooling is eliminated. Is done. Therefore, it is possible to perform the outside air cooling for a plurality of areas while eliminating the state where the outside air cooling is excessively performed such as overcooling.

  According to a fourth characteristic configuration of the present invention, when there is an area that cannot cover the area individual load when the air volume control unit performs the area priority control, the air conditioner in the area In the point which is comprised so that the said air-conditioning process part may be controlled so that an individual load may be covered.

  When area priority control is being performed, by adjusting the overall outside air introduction amount to the lower side, there is a possibility that an area that cannot cover the individual area load only by outside air cooling may occur. Therefore, according to this configuration, when there is an area that cannot cover the area individual load when executing the area priority control, the air conditioner provided in the area is introduced by the outside air introduction unit. Since the air conditioning processing unit is controlled so that the outside air is subjected to air conditioning processing by the air conditioning processing unit, the area individual load can be covered. Thereby, even when area priority control is performed, it is possible to appropriately cover area individual loads in all of the plurality of areas.

According to a fifth characteristic configuration of the present invention, the outside air introduction amount adjustment unit is provided with a bypass path for returning outside air downstream of the variable air volume fan to the upstream side of the variable air volume fan,
The small air volume adjusting unit is configured to freely adjust the air volume in the bypass passage.

  For example, when the small air volume adjustment unit adjusts the air volume downstream of the variable air volume fan, the air volume is adjusted by giving resistance to the outside air whose air volume has been adjusted by the variable air volume fan. Become. Therefore, there is a disadvantage in terms of energy saving, such as an increase in energy consumption of the variable airflow fan. Therefore, according to this configuration, the small air volume adjusting unit can introduce the outside air without adjusting the air volume adjusted by the variable air volume fan by adjusting the air volume in the bypass passage. it can. Therefore, the energy consumption of the variable air volume fan can be reduced, and the energy saving performance can be improved.

The figure which shows schematic structure of the air conditioning system in 1st Embodiment. Flow chart showing the operation when cooling the air-conditioning target space Flow chart showing operation in outside air cooling control The figure which shows schematic structure of the air conditioning system in 2nd Embodiment. Flow chart showing operation when performing outside air cooling The figure which shows schematic structure of the air conditioning system in another embodiment. The figure which shows schematic structure of the air conditioning system in another embodiment.

An embodiment of an air-conditioning system according to the present invention will be described with reference to the drawings.
[First Embodiment]
As shown in FIG. 1, the air conditioning system includes an outside air introduction unit 1 that introduces outside air, and an air conditioner 3 that can freely supply outside air introduced by the outside air introduction unit 1 as conditioned air to an air conditioning target space 2; An outside air introduction amount adjustment unit 4 capable of adjusting the outside air introduction amount introduced by the outside air introduction unit 1 and an air volume control unit 5 that controls the outside air introduction amount adjustment unit 4 are provided.

  The outside air introduction unit 1 is configured by a passage such as a duct having one end opened to the outside air and the other end connected to the air conditioner 3. The outside air introduction unit 1 is configured to take outdoor outside air (solid arrow in FIG. 1) and guide it to the air conditioner 3.

  The air conditioner 3 is arrange | positioned at the space etc. which adjoin the air conditioning object space 2, for example. In addition to the outside air, the air conditioner 3 uses, as air-conditioned air (black arrows in FIG. 1), air that has been air-conditioned by the air-conditioning processing unit 10 from the return air from the air-conditioning target space 2 (dotted arrows in FIG. 1). It is configured to be freely supplied to the air conditioning target space 2. Thereby, when performing outside air cooling, the air conditioner 3 supplies the outside air introduced by the outside air introduction unit 1 as it is to the air-conditioning target space 2 as the conditioned air, or the outside air introduced by the outside air introduction unit 1. The air after the air conditioning process is supplied to the air conditioning target space 2 as the conditioned air. When the outside air cooling is not performed, the air conditioner 3 air-conditions the return air from the air-conditioning target space 2 and supplies the air after the air-conditioning processing to the air-conditioning target space 2 as conditioned air. Incidentally, when performing the outside air cooling, if necessary, the outside air introduced by the outside air introduction unit 1 is mixed with the return air from the air-conditioning target space 2 to air-condition the mixture, and after the air-conditioning treatment It is also possible to supply the air to the air-conditioned space 2 as conditioned air.

  In addition to the outside air introduction unit 1, the air conditioner 3 includes a return air path 6 that supplies the return air from the air conditioning target space 2 (indicated by a dotted arrow in FIG. 1) to the air conditioner 3, and conditioned air ( An air supply path 7 that supplies a black arrow) to the air-conditioning target space 2 is connected. The return air path 6 is open to the ceiling space 8 of the air conditioning target space 2, and is configured to supply the return air from the air conditioning target space 2 to the air conditioning device 3 through the ceiling space 8. The air supply path 7 is open to the underfloor space 9 of the air-conditioning target space 2, and is configured to supply conditioned air to the air-conditioning target space 2 through the underfloor space 9.

  The air conditioner 3 supplies air-conditioning air to the air-conditioning target space 2 and the air-conditioning processing unit 10 for air-conditioning the supplied air (only the outside air, only the return air from the air-conditioning target space 2, the mixture of the outside air and the return air). An air supply fan 11 is provided. The air-conditioning processing unit 10 is configured by a cold water coil that performs heat exchange between a heat medium (for example, cold water) circulated and supplied from a heat source unit (not shown) and the supplied air to cool the supplied air. Yes. Incidentally, the air-conditioning processing unit 10 may be a cold / hot water coil that heats the air supplied by a heat medium (for example, hot water) supplied from a heat source machine as well as cooling the supplied air. The configuration can be changed as appropriate.

  Although not shown, the air conditioner 3 includes an air conditioner control unit that controls the rotation speed of the air conditioning processing unit 10 and the air supply fan 11. For the air conditioning processing unit 10, for example, the air conditioning device control unit controls the air conditioning processing unit 10 by controlling the supply amount of the heat medium supplied to the air conditioning processing unit 10. The control unit for the air conditioner controls the air conditioning processing unit 10 and the air supply fan 11 so that the temperature of the conditioned air supplied through the air supply path 7 (the black arrow in FIG. 1) becomes the target supply air temperature. It is configured to control the rotation speed.

  The target supply air temperature will be described. As a target air-conditioning state of the air-conditioning target space 2, a user or the like can set a target temperature and humidity of temperature and humidity. Therefore, the control unit for the air conditioner uses the deviation between the target temperature and humidity set by the user and the temperature and humidity of the air-conditioning target space 2 and the relationship between the preset deviation and the supply air temperature. The target supply air temperature is obtained. Regarding the temperature and humidity of the air conditioning target space 2, the air conditioner control unit acquires the temperature and humidity information of the air conditioning target space 2 by acquiring the detection information of the temperature and humidity sensor 16 arranged in the air conditioning target space 2. Yes. The relationship between the deviation and the supply air temperature is, for example, a relationship indicating how much the supply air temperature should be set according to the magnitude of the deviation, and is set in advance based on experiments and various other conditions. Incidentally, although the target temperature and humidity of temperature and humidity are set as the target air-conditioning state of the air-conditioning target space 2, a target temperature only of temperature may be set. In this case, the target supply air temperature can be obtained using the deviation between the target temperature and the temperature of the air-conditioning target space 2.

  The outside air introduction amount adjustment unit 4 includes a variable air volume fan 12 and a small air volume adjustment unit 13 that can be adjusted to an air volume smaller than the air volume adjustment range of the variable air volume fan 12. The variable air volume fan 12 is disposed in the middle of the outside air introduction unit 1, and is provided with a bypass 14 that returns outside air downstream of the variable air volume fan 12 to the upstream side of the variable air volume fan 12. The small air volume adjusting unit 13 is configured by, for example, a damper or the like, and is disposed at a midpoint of the bypass path 14 so that the air volume in the bypass path 14 can be adjusted.

Control by the air volume control unit 5 will be described.
The air volume control unit 5 is configured to control the outside air introduction amount adjustment unit 4 so that the outside air introduction amount becomes a required outside air amount corresponding to the load state of the air-conditioning target space 2. The air volume control unit 5 acquires the temperature and humidity information of the air conditioning target space 2 based on the detection information of the temperature and humidity sensor 16 arranged in the air conditioning target space 2. The air volume control unit 5 is configured to obtain the required outside air volume based on the temperature and humidity information of the air conditioning target space 2 and the target temperature and humidity set by the user or the like. For example, the air volume control unit 5 obtains the required outside air volume so that the greater the deviation between the temperature and humidity of the air-conditioning target space 2 and the target temperature and humidity, the greater the required outside air volume.

  The air volume control unit 5 is configured to control the outside air introduction amount adjustment unit 4 in a form that controls the rotational speed of the variable air volume fan 12 when the outside air required air volume is equal to or greater than a set value. The air volume control unit 5 controls the rotation speed of the variable air volume fan 12 so that the rotation speed of the variable air volume fan 12 increases as the outside air required air volume increases. At this time, the air volume control unit 5 controls the small air volume adjusting unit 13 so that the air volume in the bypass passage 14 becomes zero.

  For example, the set value can be set to a minimum air volume that can be adjusted by the variable air volume fan 12 or an air volume that is larger than the minimum air volume by a predetermined air volume. Thus, the set value can be set with reference to the minimum air volume that can be adjusted by the variable air volume fan 12.

  The air volume control unit 5 sets the rotation speed of the variable air volume fan 12 to a constant setting rotation speed and controls the small air volume adjustment unit 13 when the outside air required air volume is less than the set value, and controls the small air volume adjustment unit 13. Is configured to control. The air volume control unit 5 sets the rotation speed of the variable air volume fan 12 as a constant set rotation speed, and controls the small air volume adjustment unit 13 according to the size of the outside air required air volume. As for the control of the small air volume adjusting unit 13, the air volume control unit 5 controls the small air volume adjusting unit 13 so that the air volume in the bypass passage 14 increases as the outside air required air volume decreases.

  The set rotational speed can be set to a minimum rotational speed of the variable airflow fan 12 or a rotational speed that is larger than the minimum rotational speed by a predetermined amount. Thus, the set rotational speed can be set with the minimum rotational speed of the variable airflow fan 12 as a reference.

  Hereinafter, based on the flowchart of FIG.2 and FIG.3, the operation | movement when air-conditioning object space 2 is cooled is demonstrated.

  First, an outside air cooling permission condition for permitting outside air cooling is set (step # 1). The setting of the outdoor air cooling permission condition can be set based on an artificial operation by the user or the like, or the air volume control unit 5 can be automatically set. The outside air cooling permission condition may be, for example, a condition including an upper limit temperature of the outside air that permits the outside air cooling and an upper and lower limit humidity of the outside air.

  Next, the target temperature and humidity are set as the target air-conditioning state of the air-conditioning target space 2 based on the manual operation of the user or the like (step # 2). Incidentally, as described above, the target temperature and humidity of temperature and humidity are set as the target air-conditioning state of the air-conditioning target space 2, but a target temperature of only temperature may be set.

  Next, when the temperature / humidity (indoor temperature / humidity) of the air-conditioning target space 2 is measured by the temperature / humidity sensor 16 disposed in the air-conditioning target space 2, the control unit for the air-conditioning apparatus Using the temperature and humidity, the target supply air temperature is obtained, and the target supply air temperature is set (steps # 3 and # 4).

  The air volume control unit 5 and the air conditioner control unit determine whether or not the outside air permission condition is satisfied based on detection information of a sensor (not shown) that measures the temperature and humidity of the outside air. If the outside air permitting condition is not satisfied, the outside air cooling is not permitted and normal control is performed (in the case of No in step # 5, step # 7). In this normal control, the air-conditioning control unit 10 and the air-conditioning control unit 10 and the air-conditioning processing unit 10 and the air-conditioning control unit 10 and the air-conditioning control unit 10 The rotational speed of the air supply fan 11 is controlled. Thereby, ventilation from the air-conditioning target space 2 is air-conditioned (cooled) by the air-conditioning processing unit 10, and air after the air-conditioning processing is supplied to the air-conditioned target space 2 as conditioned air.

  If the outside air permission condition is satisfied, it is determined that the outside air cooling is permitted (step # 6 in the case of Yes in step # 5). The outside air cooling control will be described based on the flowchart of FIG.

  The air volume control unit 5 obtains the outside air required air volume based on the temperature and humidity of the air-conditioning target space 2 by the temperature and humidity sensor 16 and the target temperature and humidity, and the variable air volume fan according to the obtained outside air requested air volume. By controlling the rotational speed of 12, the fan air volume is controlled (step # 11). The air volume control unit 5 continues the fan air volume control if the outside air required air volume is equal to or greater than the set value and the outside air requested air volume is equal to or less than the maximum value (if No in step # 12, Yes in step # 13). in the case of). As described above, when the outside air required air volume is equal to or greater than the set value and the outside air requested air volume is equal to or less than the maximum value, the air volume control unit 5 continues the fan air volume control to reduce the outside air introduction amount to the outside air. It can be adjusted to the required air volume.

  When the outside air required air volume is less than the set value, the air volume control unit 5 sets the rotation speed of the variable air volume fan 12 to a constant set rotation speed, and the small air volume adjusting unit according to the magnitude of the outside air required air volume. 13 is controlled to control the small air volume adjusting unit 13 (in the case of Yes in step # 12, step # 15). After controlling the small air volume adjusting unit 13, the air volume control unit 5 holds the controlled state until a predetermined time elapses (step # 16).

  The air volume control unit 5 obtains the outside air required air volume based on the temperature and humidity of the air-conditioning target space 2 by the temperature and humidity sensor 16 and the target temperature and humidity, and if the obtained outside air requested air volume is less than the set value, the small air volume is obtained. Control of the adjustment unit 13 is continued (in the case of No in Step # 17, Step # 15). On the other hand, the air volume control unit 5 returns to the fan air volume control when the calculated outside air required air volume is equal to or greater than the set value (in the case of Yes in step # 17, step # 11).

  As described above, the air volume control unit 5 performs the air volume control of the fan when the outside air required air volume is equal to or larger than the set value, while the small air volume adjusting unit 13 performs the control when the outside air requested air volume is less than the set value. I do. As a result, when the outside air required air volume is equal to or greater than the set value, the air volume control unit 5 controls the rotational speed of the variable air volume fan 12 in accordance with the size of the outside air required air volume, so that the outside air to be introduced is introduced. Without giving resistance, the amount of outside air can be adjusted according to the load state of the air-conditioning target space 2. Moreover, even if the required outside air volume is less than the set value and the air volume control unit 5 becomes a small air volume that cannot be adjusted by the variable air volume fan 12, the air volume control unit 5 controls the small air volume adjusting unit 13 according to the size of the outside air required air volume. Thus, the outside air introduction amount can be adjusted to the outside air required air amount.

  Here, since the outside air introduction amount can be adjusted to the outside air required air volume even if the outside air demand air volume becomes small, the upper limit temperature and the upper and lower limit humidity of the outside air are set as the outside air cooling permission condition in Step # 1 of FIG. In this case, the upper limit temperature can be set to a higher temperature, and the upper limit humidity can be set to a higher humidity.

  When the upper limit temperature is set to a higher temperature or the upper limit humidity is set to a higher humidity, the deviation between the upper limit temperature and the target temperature and the deviation between the upper limit humidity and the target humidity are reduced. The required outside air volume is reduced. Therefore, in this embodiment, the air volume control unit 5 controls the small air volume adjustment unit 13 to adjust the outside air introduction amount to the outside air required air volume even if the outside air requested air volume becomes small. As a result, even if the upper limit temperature and upper limit humidity of the outside air cooling permission condition are set higher, the outside air cooling can be performed while appropriately adjusting the outside air introduction amount. Can be set to a condition that permits the Therefore, outside air cooling can be fully utilized, and energy saving can be improved.

  Returning to FIG. 3, when the air volume control unit 5 performs the air volume control of the fan, if the calculated outside air required air volume exceeds the maximum value, the air conditioner control unit supplies air through the air supply path 7. The air conditioning processing unit 10 is controlled so that the temperature of the conditioned air (black arrow in FIG. 1) becomes the target supply air temperature (in the case of No in Step # 13, Step # 14).

  The maximum value can be set to a maximum air volume that can be adjusted by the variable air volume fan 12, or an air volume that is smaller than the maximum air volume by a predetermined amount can be set to the maximum value. Thus, the maximum value can be set with reference to the maximum air volume that can be adjusted by the variable air volume fan 12.

  In the case of No in step # 13 in FIG. 3, the obtained outside air required air volume exceeds the maximum value. Therefore, even if the outside air introduced by the outside air introduction unit 1 is supplied to the air conditioning target space 2 as it is, the air conditioning target space 2 will not be able to cover the load. Therefore, the control unit for the air conditioner controls the air conditioning processing unit 10 so that the temperature of the conditioned air supplied through the air supply path 7 (the black arrow in FIG. 1) becomes the target supply air temperature. . Thereby, since the outside air which was air-conditioned by the air-conditioning processing unit 10 to the target supply air temperature is supplied to the air-conditioning target space 2 as air-conditioned air, the load of the air-conditioning target space 2 can be covered.

  By the way, when the outside air cooling is performed, when the temperature of the conditioned air supplied through the air supply path 7 (indicated by black arrows in FIG. 1) becomes higher than the target supply air temperature, the air conditioner control unit The air conditioning processing unit 10 can be controlled such that the temperature of the conditioned air supplied through the air supply path 7 (the black arrow in FIG. 1) becomes the target supply air temperature. As a result, even if the outside air is supplied as it is to the air-conditioning target space 2 as air-conditioned air, the air-conditioning processing unit 10 performs air-conditioning processing (cooling processing) to reduce the target supply air temperature. Air-conditioned air can be supplied to the air-conditioning target space 2, and the load on the air-conditioning target space 2 can be covered appropriately.

[Second Embodiment]
In the said 1st Embodiment, as shown in FIG. 1, although the example which comprised the air-conditioning object space 2 in one area was shown, this 2nd Embodiment is shown in FIG. An example in which the space 2 is divided into a plurality of areas 2a to 2d is shown. 1 shows a longitudinal sectional view, while FIG. 4 shows a cross-sectional plan view. Hereinafter, although the air conditioning system in 2nd Embodiment is demonstrated based on FIG. 4, about the structure similar to the said 1st Embodiment, the description is abbreviate | omitted by attaching | subjecting the same code | symbol. Incidentally, also in FIG. 4, as in FIG. 1, outside air is indicated by a solid arrow, return air from the air-conditioned space 2 is indicated by a dotted arrow, and conditioned air is indicated by a black arrow.

  The air conditioning target space 2 is divided into a plurality of areas 2a to 2d, and an air conditioner 3 is provided in each of the plurality of areas 2a to 2d. It is possible to appropriately change the number of areas into which the air-conditioning target space 2 is divided, the area of the area, and the like.

  The outside air introduction unit 1 is configured to be able to supply outside air to the plurality of air conditioners 3 by introducing outside air to the plurality of areas 2a to 2d. One end side of the outside air introduction unit 1 is open to the outside air, and is configured to concentrate and introduce outside air to the plurality of areas 2a to 2d. The outside air introduction unit 1 has a downstream portion branched from the downstream connection location with the bypass 14 corresponding to each of the plurality of areas 2a to 2d, and each of the branched portions is each area 2a. It is connected to the air conditioner 3 provided in ˜2d.

  Each of the plurality of areas 2a to 2d is provided with an area air volume adjusting unit 17 that can adjust the amount of outside air supplied to the air conditioner 3. The area air volume adjusting unit 17 is disposed in a portion of the outside air introducing unit 1 that is branched and connected to each of the plurality of air conditioners 3, and is configured by, for example, a VAV unit or the like.

  In the air conditioning system according to the second embodiment, among the plurality of areas 2a to 2d, the air conditioners 3 in the areas 2a to 2d in which the air conditioning operation is requested are air-conditioned, and the areas 2a to 2d in which the air conditioning operation is not requested. The air conditioner 3 is stopped. In performing the air conditioning operation, if the outside air cooling permission condition is satisfied, the outside air cooling is performed on the areas 2a to 2d in which the air conditioning operation is requested. When the outside air cooling permission condition is not satisfied, each air conditioner 3 sends the return air from each area 2a to 2d to the air conditioning processing unit 10 for the areas 2a to 2d in which the air conditioning operation is requested. Air-conditioning processing is performed, and the air after the air-conditioning processing is supplied to each of the areas 2a to 2d as conditioned air. That is, when the outside air cooling permission condition is not satisfied, each air conditioner 3 performs the normal control in the first embodiment with respect to the areas 2a to 2d in which the air conditioning operation is requested (FIG. 2). Step # 7).

The control by the air volume control unit 5 when performing outside air cooling will be described.
The air volume control unit 5 includes a variable air volume fan 12 and a small air volume adjustment unit so that the entire outside air introduction amount in the plurality of areas 2a to 2d becomes the outside air required air volume according to the load state in the plurality of areas 2a to 2d. 13 and the area air volume adjusting unit 17 is controlled according to the load state of each area.

  The air volume control unit 5 controls each of the plurality of area air volume adjustment units 17 to adjust the individual outside air introduction amount (the outside air supply amount to the air conditioner 3) for each of the plurality of areas 2a to 2d. . The air volume control unit 5 controls the variable air volume fan 12 and the small air volume adjustment unit 13 to adjust the entire outside air introduction amount in the plurality of areas 2a to 2d.

  In each of the plurality of areas 2a to 2d, the target temperature and humidity can be set as the target air conditioning state. The air volume control unit 5 acquires temperature / humidity information of each area 2a-2d from detection information of the temperature / humidity sensor 16 arranged in each area 2a-2d, and the temperature / humidity information of each area 2a-2d and each area Based on the target temperature and humidity set in 2a to 2d, it is grasped what load the area individual load of each area 2a to 2d is.

  The air volume control unit 5 causes the outside air introduction amount (the outside air supply amount to the air conditioner 3) for each of the plurality of areas 2a to 2d to be the individual outside air introduction amount corresponding to the area individual load of each area 2a to 2d. In addition, each of the plurality of area air volume adjustment units 17 is controlled. For example, when the outside air cooling is performed for the areas 2a and 2b, the air volume control unit 5 obtains the individual outside air introduction amount corresponding to the area individual load of the area 2a, and the outside air introduction amount (air conditioner for the area 2a). 3), the area air volume adjusting unit 17 corresponding to the area 2a is controlled so that the area-specific outside air introduction corresponding to the area-specific load of the area 2b is introduced. The area air volume adjusting unit 17 corresponding to the area 2b is controlled so that the amount of the outside air introduced into the area 2b (the amount of outside air supplied to the air conditioner 3) becomes the amount of outside air introduced for each area.

  And the air volume control part 5 calculates | requires the total value of the area | region outside air introduction amount corresponding to the area separate load of each area 2a-2d as the whole target outside air introduction amount, and the whole outside air introduction amount is the whole target outside air introduction. The variable air volume fan 12 and the small air volume adjusting unit 13 (outside air introduction amount adjusting unit 4) are controlled so as to be the amount.

  The control of the variable air volume fan 12 and the small air volume adjusting unit 13 is performed in the same manner as in the first embodiment, except that the target outside air required air volume becomes the entire target outside air introduction amount. When the overall target outside air introduction amount is equal to or larger than the set value, the air volume control unit 5 increases the rotational speed of the variable air volume fan 12 as the overall target outside air introduction amount increases. While controlling the rotation speed, the small air volume adjusting unit 13 is controlled so that the air volume in the bypass passage 14 becomes zero. When the overall target outside air introduction amount is less than the set value, the air volume control unit 5 sets the rotation speed of the variable air volume fan 12 as a constant setting rotation speed, and according to the overall target outside air introduction amount. The small air volume adjusting unit 13 is controlled.

Hereinafter, based on the flowchart of FIG. 5, an operation when the outside air cooling is performed will be described.
The air volume control unit 5 controls the outside air introduction amount adjusting unit 4 by controlling the variable air volume fan 12 and the small air volume adjusting unit 13 so that the entire outside air introduction amount becomes the entire target outside air introduction amount. The area air volume adjustment unit 17 is controlled so that the outside air introduction amount (the outside air supply amount to the air conditioner 3) for each of the areas 2a to 2d becomes the individual area outside air introduction amount corresponding to the area individual load (step). # 21).

  Thereby, in each area 2a-2d, the air volume control part 5 adjusts the external air introduction amount (the external air supply amount to the air conditioner 3) in each area 2a-2d according to the magnitude | size of area separate load. . When the area individual load is reduced, the amount of outside air introduced into the areas 2a to 2d (the amount of outside air supplied to the air conditioner 3) is reduced accordingly. At this time, even if the air volume control unit 5 controls the area air volume adjusting unit 17 to the minimum side of the outside air introduction amount (the outside air supply amount to the air conditioner 3), the air conditioning state is excessive (overcool) than the area individual load. It may become.

  In this case, the air volume control unit 5 performs area priority control assuming that there are areas 2a to 2d in which the air conditioning state is larger than the area individual load (in the case of Yes in step # 22, step # 23). In the area priority control, the air volume control unit 5 sets the entire outside air introduction amount so that the outside air supply amount to the areas 2a to 2d in which the air conditioning state is larger than the area individual load is the air volume according to the area individual load. The variable air volume fan 12 and the small air volume adjusting unit 13 are controlled so as to adjust to the lower side. For example, in the area 2a, when the air-conditioning state becomes excessive (overcool) than the area individual load, the air volume control unit 5 performs area priority control, so that the air volume control unit 5 corresponds to the individual loads of the areas 2a to 2d. The variable air volume fan 12 and the small air volume adjusting unit 13 are controlled so as to adjust to a lower side than the overall target outside air introduction volume, which is the total value of the outside air introduction volume. The air volume control unit 5 obtains an excessive amount that is excessive with respect to the individual area load based on the deviation between the temperature and humidity of the area 2a and the target temperature and humidity, and only a reduction amount that is set in advance according to the excessive amount. The variable air volume fan 12 and the small air volume adjusting unit 13 are controlled so that the overall target outside air introduction amount is adjusted to the lower side. As a result, in the area 2a, the amount of outside air introduced (the amount of outside air supplied to the air conditioner 3) is reduced, and the situation where the air conditioning state is excessive (overcool) than the area individual load is eliminated, and the area individual load is reduced. Can be covered appropriately.

  As described above, in area priority control, since the overall target outside air introduction amount is adjusted to be lower than the entire target outside air introduction amount, each air conditioner 3 uses the outside air introduced by the outside air introduction unit 1 as conditioned air as it is. When supplying to 2a to 2d, there is a possibility that there are areas 2a to 2d that cannot cover the area individual load.

  Therefore, when the air volume control unit 5 is performing area priority control and there are areas 2a to 2d that cannot cover the individual area loads, the air conditioners 3 in the areas 2a to 2d are connected to the individual area loads. The air-conditioning processing unit 10 is controlled so as to cover (in the case of Yes in step # 24, step # 25). For example, if the area individual load cannot be covered in the area 2b, the air-conditioning unit 3 controls the air-conditioning unit 3 so that the air-conditioning air supplied to the area 2b reaches the target supply air temperature. The processing unit 10 is controlled. As a result, the air-conditioning process (cooling process) is performed on the outside air by the air-conditioning processing unit 10, whereby the conditioned air at the target supply air temperature can be supplied to the area 2 b, and the area individual load can be appropriately covered.

  When the air volume control unit 5 is executing the area priority control, the air conditioning state is controlled individually for each area while the area air volume adjustment unit 17 is controlled to the minimum side of the individual outside air introduction amount (the outside air supply amount to the air conditioner 3). When the area priority control end condition is satisfied such that the areas 2a to 2d that are larger than the load do not exist or the predetermined time has elapsed since the start of the execution of the area priority control, the air volume control unit 5 End area priority control. When the area priority control is finished, the air volume control unit 5 controls the outside air introduction amount adjustment unit 4 and returns to a state in which the area air volume adjustment unit 17 is controlled (in the case of Yes in step # 26, step #). 21). Incidentally, various conditions can be set as the area priority control end condition.

[Another embodiment]
Another embodiment of the present invention will be described. Note that the configuration of each embodiment described below is not limited to being applied alone, but may be applied in combination with the configuration of another embodiment.

(1) In the above embodiment, the air conditioner 3 supplies the conditioned air to the air conditioned space 2 through the underfloor space 9. For example, the air conditioner 3 supplies the conditioned air to the air conditioned space 2 through the ceiling space 8. It can also be supplied, and how the conditioned air is supplied to the air-conditioning target space 2 can be appropriately changed.

(2) In the above-described embodiment, the bypass path 14 for returning the outside air downstream of the variable air volume fan 12 to the upstream side of the variable air volume fan 12 is provided, and the small air volume adjusting unit 13 can adjust the air volume in the bypass path 14. Yes. Instead, in the outside air introduction unit 1, a small air volume adjustment unit 13 is disposed on the downstream side of the variable air volume fan 12, and the small air volume adjustment unit 13 is disposed in the downstream side portion of the variable air volume fan 12 in the outside air introduction unit 1. The air volume can also be adjusted.

(3) In the above embodiment, an example in which one variable airflow fan 12 is provided has been described. However, the number of variable airflow fans 12 can be changed as appropriate, and a plurality of variable airflow fans 12 may be provided in parallel. it can.

  For example, as shown in FIG. 6, two variable airflow fans 12 can be provided in parallel. In this case, if the outside air required air volume is equal to or greater than the set value for a plurality of units, the air volume control unit 5 operates both of the two variable air volume fans 12 so that one variable air volume fan 12 has the maximum capacity, and the outside air Another variable air volume fan 12 can be controlled in accordance with the required air volume. The air volume control unit 5 operates only one variable air volume fan 12 if the outside air required air volume is less than the set value for a plurality of units, and sets the one variable air volume fan 12 according to the size of the outside air required air volume. Can be controlled.

(4) In the above-described embodiment, the small air volume adjusting unit 13 is arranged in the bypass channel 14, and the small air volume adjusting unit 13 adjusts the air volume in the bypass channel 14, thereby supplying the outside air supply amount ( The amount of outside air introduced) is adjusted. Instead, as shown in FIG. 7, in addition to the small air volume adjustment unit 13 of the bypass path 14, the air volume of the variable air volume fan 12 is located downstream of the arrangement position of the variable air volume fan 12 in the outside air introduction path 1. An additional small air volume adjustment unit 18 (for example, a damper) that can be adjusted to an air volume smaller than the adjustment range can be provided. In this case, the small air volume adjusting unit 13 in the bypass passage 14 and the additional small air volume adjusting unit 18 in the outside air introduction path 1 can constitute the small air volume adjusting unit in the present invention. Since the small air volume adjusting unit 13 in the bypass passage 14 and the additional small air volume adjusting unit 18 in the outside air introduction path 1 can adjust the outside air supply amount (outside air introduction amount) supplied to the air conditioner 3, the air conditioner The amount of outside air supplied to 3 (outside air introduction amount) can be adjusted more finely.

DESCRIPTION OF SYMBOLS 1 Outside air introduction part 2 Air-conditioning object space 2a-2d Area 3 Air conditioner 4 Outside air introduction amount adjustment part 5 Air volume control part 10 Air conditioning processing part 12 Variable air quantity fan 13 Small air quantity adjustment part 14 Bypass path 17 Area air quantity adjustment part

Claims (5)

An outside air introduction section for introducing outside air;
An air conditioner that can freely supply the outside air introduced in the outside air introduction section to the air-conditioned space as conditioned air;
An outside air introduction amount adjustment unit capable of adjusting the outside air introduction amount introduced by the outside air introduction unit; and
An air volume control unit that controls the outside air introduction amount adjustment unit so that the outside air introduction amount becomes a required outside air amount according to a load state of the air-conditioning target space;
The outside air introduction amount adjustment unit includes a variable air volume fan and a small air volume adjustment unit that is adjustable to an air volume smaller than an air volume adjustment range of the variable air volume fan,
The air volume control unit controls the outside air introduction amount adjusting unit in a form of controlling the rotation speed of the variable air volume fan when the outside air required air volume is equal to or larger than a set value, and the outside air requested air volume is less than the set value. In this case, the air-conditioning system is configured to control the outside air introduction amount adjustment unit in a form in which the rotation speed of the variable air volume fan is set to a constant set rotation speed and the small air volume adjustment unit is controlled. The air conditioning target space is divided into a plurality of areas,
The air conditioner is provided in each of a plurality of areas, and is configured to be able to supply air that has been air-conditioned by the air-conditioning processing unit to return air from the area as air-conditioned air in addition to outside air,
The outside air introduction unit is configured to introduce outside air to a plurality of areas and be freely supplied to each of the plurality of air conditioners.
Each of the plurality of areas is provided with an area air volume adjustment unit capable of adjusting the amount of outside air supplied to the air conditioner,
The air volume control unit controls the outside air introduction amount adjustment unit so that the entire outside air introduction amount in the plurality of areas becomes the outside air required air volume according to the load state in the plurality of areas as a whole. The air conditioning system according to claim 1, wherein the area air volume adjusting unit is configured to be controllable according to a load state.   The air volume control unit controls the amount of outside air supplied to the area when there is an area in which the air conditioning state exceeds the area individual load even if the area air volume adjustment unit is controlled to the minimum side of the outside air supply amount. The area priority control for controlling the outside air introduction amount adjustment unit is configured to be executable so as to adjust the whole outside air introduction amount in a plurality of areas to a lower side in order to obtain an air volume corresponding to an individual load. Item 3. The air conditioning system according to Item 2.   When there is an area that cannot cover the area individual load when the air volume control unit is executing the area priority control, the air conditioner of the area covers the area individual load. The air conditioning system according to claim 3, wherein the air conditioning system is configured to control the processing unit. The outside air introduction amount adjustment unit is provided with a bypass path for returning outside air downstream of the variable air volume fan to the upstream side of the variable air volume fan,
The air conditioning system according to any one of claims 1 to 4, wherein the small air volume adjusting unit is configured to freely adjust an air volume in the bypass passage.

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