JP5973842B2 - Duct system - Google Patents

Description

  The present invention relates to a duct system that supplies conditioned air from an indoor unit to a plurality of zones through a main duct.

  Small buildings require an air conditioning system with a lower initial cost than large buildings. For this reason, conventionally, in a small-scale building, a system has been adopted in which a duct is connected to an indoor unit to perform air conditioning control of a plurality of zones (see, for example, Patent Document 1). A system in which a duct is connected to this indoor unit to perform air conditioning control in a plurality of zones (control target areas) is called duct building multi air conditioning.

  FIG. 10 shows a configuration example of conventional duct building multi air conditioning. In the figure, 1 is an indoor unit, 2 is a main duct, 3 (3-1 to 3-8) is a branch duct, 4 (4-1 to 4-8) is a control target area AR (AR1 to AR8). Air outlets 5 (5-1 to 5-8) are dampers. The main duct 2 and the branch duct 3 are straight iron plate ducts. The dampers 5-1 to 5-8 are provided in the branch ducts 4-1 to 4-8. The damper 5 may be a motor damper or a manual damper.

  In this system, the indoor unit 1 supplies conditioned air to the main duct 2. The conditioned air from the indoor unit 1 supplied to the main duct 2 is branched by the branch ducts 3-1 to 3-8, led to the outlets 4-1 to 4-8, and blown out to the control target areas AR1 to AR8. Is done. The amount of conditioned air blown from the blowout ports 4-1 to 4-8 to the control target areas AR1 to AR8 is adjusted by dampers 5-1 to 5-8. Further, the air volume of the indoor unit 1 is adjusted by an air supply air volume adjusting device (not shown). For example, when the air volume from the outlets 4-1 to 4-8 is reduced, the air volume from the indoor unit 1 is reduced.

JP 2006-132822 A

  However, such a duct building multi-air conditioning system has good individuality, operability, and efficiency improvement, but the air volume of the indoor unit cannot be reduced so much. For this reason, the air volume from a blower outlet cannot be reduced greatly, the airflow complaint (claims, such as airflow directly hitting) directly under a blower outlet, or the complaint about supercooling and overheating may arise. There was a problem such as.

  This is due to the fact that the air volume of the indoor unit can be reduced to only about 70% of the rating in order to protect the refrigerant circuit. If the air flow is reduced too much, that is, if the necessary and sufficient air flow cannot be secured, the protection circuit works and the outdoor unit (compressor) repeatedly starts and stops, resulting in intermittent cooling of the indoor unit (heating). It becomes operation, and the supply air temperature and the room temperature hunt greatly and become unstable.

  The present invention has been made in order to solve such problems. The object of the present invention is to restrict the air volume from the outlet while ensuring the necessary and sufficient air volume of the indoor unit, and to prevent airflow complaints and overcooling. • To provide a duct system capable of addressing claims relating to overheating.

In order to achieve such an object, the present invention provides an indoor unit that supplies conditioned air to a main duct, a branch duct that branches conditioned air from the indoor unit supplied to the main duct, and a branch duct. The conditioned air from the indoor unit supplied to the main duct is separated from the branch duct, the air outlet for blowing the conditioned air to the controlled area, the damper for adjusting the air volume of the conditioned air blown to the controlled area The amount of conditioned air from the indoor unit sent to the branch duct and the amount of conditioned air from the indoor unit sent to the shunt duct based on the shunt duct that shunts to the path and the damper opening for each controlled area and control means for controlling, the control means monitors and controls damper opening degree of the subject each area, if the average degree of the damper is equal to or less than a minimum opening to a predetermined, or controlled object When the ventilation air volume of the indoor unit that is estimated based on the opening degree of the damper for each rear is less than or equal to the predetermined lower limit value, characterized in that opening a damper provided in the diversion duct.

  In the present invention, the control means determines the amount of conditioned air from the indoor unit sent to the branch duct and the amount of conditioned air from the indoor unit sent to the shunt duct based on the opening of the damper for each controlled area. Control. That is, among the conditioned air sent from the indoor unit to the main duct, the amount of conditioned air sent to the control target area and the amount of conditioned air sent to another path without being supplied to the control target area) Control based on the opening of each damper.

In this case, the control unit is an indoor unit estimated when the average opening degree of the damper for each control target area is equal to or less than a predetermined minimum opening degree or based on the opening degree of the damper for each control target area. The damper provided in the shunt duct is opened when the amount of draft air is less than or equal to a predetermined lower limit value. As a result, the conditioned air from the indoor unit also flows toward the shunt duct, and a necessary and sufficient air volume of the indoor unit is ensured.

  In the present invention, the shunt duct may be a bypass duct that communicates the air inlet side and the outlet side to the indoor unit, or a relief duct that communicates the air outlet side from the indoor unit and the ceiling back chamber. Conceivable. When the shunt duct is a bypass duct, for example, a bypass damper is provided in the bypass duct, and the operation of the bypass damper is controlled. When the shunt duct is a relief duct, for example, a relief damper is provided in the relief duct, and the operation of the relief damper is controlled.

  In the present invention, the main duct may be a straight duct or a loop duct connected in an annular shape. When a loop duct is used as a main duct, for example, a flexible duct may be connected in a ring shape to form a loop duct, and this loop duct may be used as the main duct.

According to the present invention, a shunt duct that divides the conditioned air from the indoor unit supplied to the main duct into a path different from the branch duct is provided, and the opening degree of the damper for each area to be controlled is monitored. When the average opening is less than or equal to a predetermined minimum opening, or the ventilation volume of the indoor unit estimated based on the opening of the damper for each control target area is less than or equal to a predetermined lower limit In this case, the damper installed in the shunt duct is opened, so that the necessary air flow for the indoor unit is secured and the air flow from the air outlet is throttled to deal with air flow complaints and complaints related to subcooling / superheating. It becomes possible to do.

It is a figure which shows one Embodiment (Embodiment 1) of the duct system which concerns on this invention. It is a figure which shows other embodiment (Embodiment 2) of the duct system which concerns on this invention. It is a figure which shows the duct system (Embodiment 3) which used the main duct in Embodiment 1 as the loop duct. It is a figure which shows the duct system (Embodiment 3) which used the main duct in Embodiment 2 as the loop duct. It is a figure (an example of Embodiment 7) which shows the example which combined dehumidification control with the composition of Embodiment 1. 3 is a functional block diagram of a main part of a control device in Embodiments 1 and 3. FIG. 6 is a functional block diagram of a main part of a control device in Embodiments 2 and 4. FIG. FIG. 10 is a functional block diagram of a main part of a control device in a fifth embodiment. FIG. 20 is a functional block diagram of a main part of a control device in a sixth embodiment. It is a figure which shows the structural example of the conventional duct building multi air conditioning.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1]
FIG. 1 shows an embodiment (Embodiment 1) of a duct system according to the present invention. 10, the same reference numerals as those in FIG. 10 denote the same or equivalent components as those described with reference to FIG. 10, and the description thereof is omitted.

  In the first embodiment, the conditioned air from the indoor unit 1 supplied to the main duct 2 is divided into a path different from the branch ducts 3-1 to 3-8, and the air to the indoor unit 1 is A bypass duct 6 is provided to allow communication between the inlet side and the outlet side. Further, a bypass damper 7 is provided in the bypass duct 6, and the operation of the bypass damper 7 is controlled by the control device 8 (8A).

  A bypass damper 7 provided in the bypass duct 6 and dampers 5-1 to 5-8 provided in the branch ducts 3-1 to 3-8 are connected to the control device 8A via the damper network NW. ing. The dampers 5-1 to 5-8 and the bypass damper 7 are motor dampers. Hereinafter, the damper 5 provided in the branch duct 3 is referred to as a blowout damper.

  The control device 8A is realized by hardware including a processor and a storage device, and a program that realizes various functions in cooperation with these hardware, and has a bypass damper control function as a function unique to the present embodiment. ing. Hereinafter, the bypass damper control function of the control device 8A will be described.

  The control device 8A monitors the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8 via the damper network NW, and the average opening degree θave of the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8. Is less than or equal to a predetermined minimum opening θmin.

  If the average opening θave of the openings θ1 to θ8 of the blowout dampers 5-1 to 5-8 exceeds the minimum opening θmin, the control device 8A determines that the normal state is set, and sets the bypass damper 7 close up.

  In the control target areas AR <b> 1 to AR <b> 8, the air volume from the air outlets 4-1 to 4-8 is not greatly reduced when there is no complaint about airflow or overcooling / superheating. For this reason, normally, the average opening degree θave of the blow-out dampers 5-1 to 5-8 exceeds the minimum opening degree θmin.

  The control device 8A closes the bypass damper 7 with such a state as a normal state. At this time, if the bypass damper 7 is fully closed, the conditioned air sent from the indoor unit 1 to the main duct 1 is entirely controlled via the branch ducts 3-1 to 3-8. Sent to AR8.

  On the other hand, for example, in a plurality of control target areas AR, complaints regarding airflow and supercooling / superheating occur, and the air volume from the plurality of outlets 4 is greatly reduced in order to cope with this claim. It is assumed that the opening θave becomes equal to or less than the minimum opening θmin.

  When the average opening θave of the blowing dampers 5-1 to 5-8 is equal to or less than the minimum opening θmin, the control device 8A determines that the entire blowing damper 5 is in a squeezed state and opens the bypass damper 7. . Thereby, the conditioned air sent from the indoor unit 1 to the main duct 1 is diverted and also flows to the bypass duct 6 side. That is, the conditioned air from the indoor unit 1 is returned to the air inlet side of the indoor unit 1 through the bypass duct 6 and recirculated.

  As a result, the necessary and sufficient air volume of the indoor unit 1 is ensured without the protection circuit working. That is, it is possible to narrow down the air volume from the outlet 4-1 while ensuring the necessary and sufficient air volume of the indoor unit 1, and to deal with the complaints regarding airflow and supercooling / superheating.

[Embodiment 2]
FIG. 2 shows another embodiment (Embodiment 2) of the duct system according to the present invention. In the first embodiment described above, the bypass duct 6 is provided as a shunt duct. However, in the second embodiment, the relief duct 9 is provided as a shunt duct.

  The relief duct 9 is a duct that communicates the outlet side of the air from the indoor unit 1 and a ceiling back chamber (not shown). The chamber behind the ceiling communicates with a return air duct 11 connected to the air inlet side to the indoor unit 1. In the second embodiment, a relief damper 10 is provided in the relief duct 9, and the operation of the relief damper 10 is controlled by the control device 8 (8B).

  A relief damper 10 provided in the relief duct 9 and blowing dampers 5-1 to 5-8 provided in the branch ducts 3-1 to 3-8 are connected to the control device 8B via the damper network NW. Has been. The blowout dampers 5-1 to 5-8 and the relief damper 10 are motor dampers.

  The control device 8B monitors the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8 via the damper network NW, and the average opening degree θave of the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8. Is less than or equal to a predetermined minimum opening θmin.

  If the average opening degree θave of the blowing dampers 5-1 to 5-8 exceeds the minimum opening degree θmin, the control device 8B closes the relief damper 10 as being in a normal state.

  In the control target areas AR <b> 1 to AR <b> 8, the air volume from the air outlets 4-1 to 4-8 is not greatly reduced when there is no complaint about airflow or overcooling / superheating. For this reason, normally, the average opening degree θave of the blow-out dampers 5-1 to 5-8 exceeds the minimum opening degree θmin.

  The control device 8B closes the relief damper 10 with such a state as a normal state. At this time, if the relief damper 10 is fully closed, the entire amount of conditioned air sent from the indoor unit 1 to the main duct 1 is controlled via the branch ducts 3-1 to 3-8. Sent to AR8.

  On the other hand, for example, in a plurality of control target areas AR, complaints regarding airflow and supercooling / superheating occur, and in order to deal with this claim, the air flow from the plurality of outlets 4 is greatly reduced, and the average It is assumed that the opening θave becomes equal to or less than the minimum opening θmin.

  When the average opening θave of the blowing dampers 5-1 to 5-8 is equal to or less than the minimum opening θmin, the control device 8B determines that the entire blowing damper 5 is in a squeezed state and opens the relief damper 10. . Thereby, the conditioned air sent from the indoor unit 1 to the main duct 1 is diverted and flows to the relief duct 9 side. That is, the conditioned air from the indoor unit 1 is discharged to the ceiling chamber through the relief duct 9, and the released conditioned air is returned from the ceiling chamber to the air inlet side of the indoor unit 1 through the return air duct 11. It becomes circulated.

  As a result, the necessary and sufficient air volume of the indoor unit 1 is ensured without the protection circuit working. That is, it is possible to narrow down the air volume from the outlet 4-1 while ensuring the necessary and sufficient air volume of the indoor unit 1, and to deal with the complaints regarding airflow and supercooling / superheating.

[Embodiment 3]
In the first embodiment, the main duct is a straight duct, but in the third embodiment, the main duct is a loop duct. FIG. 3 shows a duct system in which this main duct is a loop duct. Since the configuration except that the main duct is a loop duct is the same as that of the first embodiment, the description thereof is omitted.

  In the duct system of the third embodiment, the flexible duct 12 is connected in a ring shape to form a loop duct, and this loop duct is used as the main duct 13, and conditioned air from the indoor unit 1 is supplied to the main duct 13. .

  Further, the flexible ducts 12 are connected to each other by a branch unit 14, a branch duct 15 is connected to the branch unit 14, and conditioned air from the indoor unit 1 is guided to the outlet 4 through the branch duct 15. The branch duct 15 is also a flexible duct, like the main duct 13.

  For example, regarding the branch duct 15-1, the flexible ducts 12-1 and 12-2 are connected by the branch unit 14-1, the branch duct 15-1 is connected to the branch unit 14, and the branch duct 15-. 1, the conditioned air from the indoor unit 1 is guided to the air outlet 4-1. The same applies to the other branch ducts 15-2 to 15-8.

  In the third embodiment, since the main duct 13 is a loop duct, the difference in static pressure is small, and the characteristics of the opening degree and the air volume of the blowing damper 5 approach linearity. Moreover, although the opening dampers 5-1 to 5-8 and the bypass damper 7 are interlocked with each other as in the first embodiment, the air volume characteristic at that time is improved, and the passing air volume of the indoor unit 1 is stabilized.

[Embodiment 4]
In the second embodiment, the main duct is a straight duct, but in the fourth embodiment, the main duct is a loop duct. FIG. 4 shows a duct system in which this main duct is a loop duct. The configuration except that the main duct is a loop duct is the same as that of the second embodiment, and since the configuration of the main duct that is a loop duct is the same as that of the third embodiment, the description thereof is omitted.

  Also in the fourth embodiment, since the main duct 13 is a loop duct as in the third embodiment, the static pressure difference is small, and the characteristics of the opening degree and the air volume of the blowing damper 5 approach linearity. Further, as with the second embodiment, the opening dampers 5-1 to 5-8 and the bypass damper 7 are interlocked with each other, but the air flow characteristics at that time are improved, and the passing air flow of the indoor unit 1 is stabilized.

[Embodiment 5]
In the first and third embodiments, the control device 8A monitors the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8 via the damper network NW, and averages the opening of the blowing dampers 5-1 to 5-8. The bypass damper 7 is opened when the degree θave becomes equal to or smaller than the minimum opening θmin, but the ventilation air volume V of the indoor unit 1 is estimated based on the openings θ1 to θ8 of the blowout dampers 5-1 to 5-8. The bypass damper 7 may be opened when the estimated ventilation volume V becomes equal to or lower than a predetermined lower limit value Vmin.

  As a specific example, in the fifth embodiment, the ventilation air volume V of the indoor unit 1 is estimated from the openings θ1 to θ8 of the blow dampers 5-1 to 5-8 and the opening θbyp of the bypass damper 7, and the estimated ventilation When the air volume V is lower than the lower limit value Vmin, the bypass damper 7 is opened to increase the passing air volume of the indoor unit 1. When the estimated ventilation air volume V is sufficiently higher than the lower limit value Vmin, bypass is performed. The damper 7 is closed to reduce the bypass air volume.

[Embodiment 6]
Also in the second and fourth embodiments, the ventilation air volume V of the indoor unit 1 is estimated based on the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8 in the same manner as in the fifth embodiment. The relief damper 10 may be opened when the air flow rate V becomes equal to or less than a predetermined lower limit value Vmin.

  As a specific example, in Embodiment 6, the ventilation air volume V of the indoor unit 1 is estimated from the opening θ1 to θ8 of the blow dampers 5-1 to 5-8 and the opening θrel of the relief damper 10, and the estimated ventilation When the air volume V becomes lower than the lower limit value Vmin, the relief damper 10 is opened to increase the passing air volume of the indoor unit 1, and when the estimated ventilation air volume V sufficiently exceeds the lower limit value Vmin, the relief The damper 10 is closed to reduce the relief air volume.

In the fifth and sixth embodiments, the ventilation air volume V of the indoor unit 1 is estimated using any one of the following logics (1) to (3).
(1) Assume that the damper opening is proportional to the air volume.
(2) Estimate from the fan characteristics and duct resistance using Bernoulli's theorem.
(3) After construction, measure the relationship between the opening and the air volume, and estimate from the experimental formula.

[Embodiment 7]
In the seventh embodiment, dehumidification control is combined with the configuration of the first to sixth embodiments. FIG. 5 shows an example in which dehumidification control is combined with the configuration of the first embodiment as an example of the seventh embodiment.

  In the duct system shown in FIG. 5, humidity sensors 16-1 to 16-8 are provided in the control target areas AR1 to AR8, and the control target areas AR1 to AR8 are detected by the humidity sensors 16-1 to 16-8. The humidity hpv1 to hpv8 is monitored by the control device 8 (8C).

  The control device 8C is provided in the bypass duct 6 when, for example, at least one of the humidity hpv1 to hpv8 detected in the control target areas AR1 to AR8 is equal to or higher than a predetermined dehumidification control start humidity hth. While opening the bypass damper 7, the blowout dampers 5-1 to 5-8 provided in the branch ducts 3-1 to 3-8 are closed. Thereby, the ventilation to control object area AR1-AR8 becomes low temperature, and ventilation volume reduces. When the ventilation becomes low temperature, the amount of dehumidification in the indoor unit 1 increases, and the increase in humidity is suppressed.

  In this example, the humidity hpv1 to hpv8 detected in the control target areas AR1 to AR8 is monitored. For example, a dehumidification request from the remote controller in the control target areas AR1 to AR8 is sent to the control device 8, When there is a dehumidification request, dehumidification control may be performed in the same manner as described above.

  FIG. 6 shows a functional block diagram of a main part of the control device 8 (8A) in the first and third embodiments. The control device 8A includes an outlet damper opening degree acquisition unit 8A1 that acquires the opening degrees θ1 to θ8 and the average opening degree θave of the outlet dampers 5-1 to 5-8, and a predetermined minimum opening degree of the outlet damper 5. A minimum opening degree storage unit 8A2 that stores the degree θmin and a bypass damper control unit 8A3 that controls the operation of the bypass damper 7 are provided.

  The bypass damper control unit 8A3 includes the minimum opening stored in the opening θ1 to θ8 and the average θave and the minimum opening storage unit 8A2 of the outlet dampers 5-1 to 5-8 acquired by the outlet damper opening acquisition unit 8A1. When the average opening θave exceeds the minimum opening θmin, the bypass damper 7 is closed, and when the average opening θave is equal to or less than the minimum opening θmin, the bypass damper 7 is opened.

  FIG. 7 shows a functional block diagram of a main part of the control device 8 (8B) in the second and fourth embodiments. The control device 8B includes an outlet damper opening degree acquisition unit 8B1 that acquires the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8 and the average opening degree θave, and a predetermined minimum opening degree of the blowing damper 5. A minimum opening degree storage unit 8B2 that stores the degree θmin and a relief damper control unit 8B3 that controls the operation of the relief damper 10 are provided.

  The relief damper control unit 8B3 is stored in the opening θ1 to θ8, the average opening θave, and the minimum opening storage unit 8B2 of the blowing dampers 5-1 to 5-8 acquired by the outlet damper opening acquisition unit 8B1. With the minimum opening θmin as an input, the relief damper 10 is closed if the average opening θave exceeds the minimum opening θmin, and the relief damper 10 is opened when the average opening θave becomes equal to or less than the minimum opening θmin.

  FIG. 8 shows a functional block diagram of a main part of the control device 8 (8D) in the fifth embodiment. The control device 8D estimates a damper opening degree acquisition unit 8D1 that acquires the opening degrees θ1 to θ8 of the blowout dampers 5-1 to 5-8 and the opening degree θbyp of the bypass damper 7, and the passing air volume V of the indoor unit 1. A passing air amount estimation unit 8D2, a lower limit value storage unit 8D3 that stores a lower limit value Vmin of the passing air amount V of the indoor unit 1, and a bypass damper control unit 8D4 that controls the operation of the bypass damper 7 are provided.

  The passing air volume estimation unit 8D2 receives the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8 and the opening degree θbyp of the bypass damper 7 acquired by the damper opening degree acquisition unit 8D1, and outputs the blowing dampers 5-1 to 5-1. The ventilation air volume V of the indoor unit 1 is estimated from the opening degrees θ1 to θ8 of 5-8 and the opening degree θbyp of the bypass damper 7. The bypass damper control unit 8D4 receives the ventilation rate V of the indoor unit 1 estimated by the passing rate estimation unit 8D2 and the lower limit value Vmin of the ventilation rate V of the indoor unit 1 stored in the lower limit storage unit 8D3, and is estimated. When the air flow rate V is less than or equal to the lower limit value Vmin, the bypass damper 7 is opened to increase the air flow rate of the indoor unit 1, and when the estimated air flow rate V sufficiently exceeds the lower limit value Vmin. The bypass damper 7 is closed to reduce the bypass air volume.

  FIG. 9 shows a functional block diagram of the main part of the control device 8 (8E) in the sixth embodiment. The control device 8E includes a damper opening degree acquisition unit 8E1 that acquires the opening degrees θ1 to θ8 of the blowout dampers 5-1 to 5-8 and the opening degree of the relief damper 10, and a passage that estimates the passing air volume V of the indoor unit 1. An air volume estimation unit 8E2, a lower limit value storage unit 8E3 that stores a lower limit value Vmin of the indoor unit 1 passing air volume V, and a relief damper control unit 8E4 that controls the operation of the relief damper 10 are provided.

  The passing air volume estimation unit 8E2 receives the opening degrees θ1 to θ8 of the blowing dampers 5-1 to 5-8 and the opening degree θrel of the relief damper 10 acquired by the damper opening degree acquisition unit 8E1 and inputs the blowing dampers 5-1 to 5-1. The ventilation air volume V of the indoor unit 1 is estimated from the opening degrees θ1 to θ8 of 5-8 and the opening angle θrel of the relief damper 10. The relief damper control unit 8E4 receives the ventilation rate V of the indoor unit 1 estimated by the passing rate estimation unit 8E2 and the lower limit value Vmin of the ventilation rate V of the indoor unit 1 stored in the lower limit storage unit 8E3, and is estimated. When the air flow rate V is less than or equal to the lower limit value Vmin, the relief damper 10 is opened to increase the air flow rate of the indoor unit 1, and when the estimated air flow rate V sufficiently exceeds the lower limit value Vmin. The relief damper 10 is closed to reduce the relief air volume.

  In the first and third embodiments described above, the state in which the average opening θave is equal to or less than the minimum opening θmin is determined to be the state in which the entire blowout damper 5 is in a squeezed state, and the bypass damper 7 is opened. However, the bypass damper 7 is opened when the number of blowing dampers 5 having become the minimum opening θmin or less becomes a predetermined number or more, or the opening θ1 of the blowing dampers 5-1 to 5-8. For example, the bypass damper 7 may be opened when the average value of θ8 becomes a predetermined value or less.

  Moreover, although Embodiment 1-7 mentioned above demonstrated as what was provided with the one outlet damper 5 with respect to the blower outlet 4, the one outlet damper 5 is provided with respect to the several outlet 4. FIG. There are also examples. In this case, the area from which the plurality of air outlets 4 blow out conditioned air is the control target area.

[Extension of the embodiment]
The present invention has been described above with reference to the embodiment. However, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention. Each embodiment can be implemented in any combination within a consistent range.

  DESCRIPTION OF SYMBOLS 1 ... Indoor unit, 2 ... Main duct, 3 (3-1 to 3-8) ... Branch duct, 4 (4-1 to 4-8) ... Air outlet, 5 (5-1 to 5-8) ... Damper (Blowout damper), 6 ... Bypass duct, 7 ... Bypass damper, 8 (8A to 8E) ... Control device, 9 ... Relief duct, 10 ... Relief damper, 11 ... Return air duct, 12 (12-1 to 12-9) ) ... flexible duct, 13 ... main duct, 14 (14-1 to 14-8) ... branch unit, 15 (15-1 to 15-8) ... branch duct, 16 (16-1 to 16-8) ... humidity Sensor, NW ... Damper network, AR (AR1-AR8) ... Control target area.

Claims (4)

An indoor unit that supplies conditioned air to the main duct;
A branch duct for branching the conditioned air from the indoor unit supplied to the main duct;
A blowout port for blowing out the conditioned air branched by the branch duct to the control target area;
A damper for adjusting the volume of conditioned air blown into the control target area;
A shunt duct for shunting conditioned air from the indoor unit supplied to the main duct to a path different from the branch duct;
Control for controlling the amount of conditioned air from the indoor unit sent to the branch duct and the amount of conditioned air from the indoor unit sent to the diversion duct based on the opening of the damper for each control target area and means,
The control means includes
Monitor the opening of the damper for each area to be controlled and estimate the average opening of these dampers below a predetermined minimum opening or based on the opening of the damper for each area to be controlled A duct system comprising: opening a damper provided in the shunt duct when the air flow rate of the indoor unit is equal to or less than a predetermined lower limit value . The duct system according to claim 1,
The shunt duct is
A bypass duct that communicates an inlet side and an outlet side of air to the indoor unit,
The control means includes
A duct system for controlling an operation of a bypass damper provided in the bypass duct. The duct system according to claim 1,
The shunt duct is
A relief duct for communicating the outlet side of the air from the indoor unit and the ceiling back chamber,
The control means includes
A duct system for controlling an operation of a relief damper provided in the relief duct. In the duct system as described in any one of Claims 1-3 ,
The main duct is
A duct system characterized by being a loop duct connected in an annular shape .

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