JP7245730B2 - air conditioning system - Google Patents

Description

Air conditioning system with air handling unit

Conventionally, for example, as described in Patent Document 1 (Japanese Patent Laid-Open No. 10-253132), from an air conditioning unit having a heat exchanger and an air conditioning fan, a plurality of ventilation units having a blower fan, and an air conditioning unit Air conditioning systems with ducts for distributing conditioned air to ventilation units are known. In this air conditioning system, the number of revolutions of the blower fan is controlled for air conditioning of the room.

However, in the air conditioning system described in Patent Document 1, when the blower fan of the ventilation unit is driven at the lowest rotational speed, an electric shutter or an electric damper is used to further adjust the amount of air blown out from the ventilation unit. configuration is required.

Such an air conditioning system has a problem of reducing the cost for realizing the adjustment function when the air volume is small.

The air conditioning system of the first aspect includes an air handling unit having a heat exchanger through which a heat medium flows and a first fan, a plurality of fan units each having a second fan for blowing supplied air into a target space, and from the air handling unit a duct for distributing supply air delivered by a first fan to a plurality of fan units; and a controller for controlling the first fan, wherein the controller controls at least one of the plurality of second fans to Below, when the conditions are satisfied that the air volume of the fan unit having the second fan with a predetermined number of revolutions or less is equal to or greater than the target value and the volume of air sent out from the air handling unit is equal to or less than the threshold value, the second 1 Stop the operation of the fan.

In the air conditioning system of the first aspect, the controller stops the operation of the first fan so that the air volume of the fan unit having the second fan whose rotation speed is equal to or lower than the predetermined speed can be easily made equal to or less than the target value. By realizing the adjustment when the air volume is small under the control of the controller, the cost for realizing the adjustment function when the air volume is small can be reduced.

The air conditioning system of the second aspect is the system of the first aspect, wherein the predetermined number of revolutions is the minimum number of revolutions of the second fan.

In the air conditioning system of the second aspect, the controller stops the operation of the first fan, thereby making it easier to make the air volume of the fan unit having the second fan with the lowest rotational speed equal to or less than the target value.

The air conditioning system of the third aspect is the system of the first aspect or the second aspect, wherein the controller adjusts the environment of the target space to a set environment set in at least one fan unit among the plurality of fan units. When a condition continues for a predetermined period of time in which the air volume of at least one fan unit has not reached the target value, the stopped first fan is restarted.

In the air conditioning system of the third aspect, the controller restarts the operation of the first fan, thereby shortening the time required for the air volume of the fan unit to reach the target value, and allowing the environment of the target space to quickly reach the set environment.

BRIEF DESCRIPTION OF THE DRAWINGS The conceptual diagram which shows the structure of the air conditioning system which concerns on embodiment. FIG. 2 is a block diagram for explaining the configuration of a controller; A flow chart for explaining characteristic operation of an air conditioning system. The conceptual diagram which shows the other example of a structure of the air conditioning system which concerns on a modification.

(1) Overall Configuration The air conditioning system 10 shown in FIG. 1 includes an air handling unit 20, a fan unit 30, a duct 40, and a controller 50. As shown in FIG. The air handling unit 20 has a first fan 21 and a heat exchanger 22 . Each of the fan units 30 has a second fan 31 . Each second fan 31 supplies air from the fan unit 30 to the target space 100 . The target space 100 is, for example, a room in a building. A room is, for example, a space in which air movement is restricted by floors, ceilings and walls. A plurality of fan units 30 are arranged for one or more target spaces 100 . FIG. 1 shows an example in which an air conditioning system 10 including two fan units 30 is arranged for one target space 100 as a representative example of an air conditioning system 10 including a plurality of fan units 30. ing. The number of fan units 30 may be three or more, and is set as appropriate. As mentioned above, there may be two or more target spaces 100 in which the fan units 30 are arranged.

The duct 40 distributes the air SA delivered from the air handling unit 20 by the first fan 11 to the plurality of fan units 30 . Here, all the air blown from the first fan 21 is configured to flow into the duct 40 .

Each fan unit 30 and the target space 100 are connected by a ventilation passage 81 . Each second fan 31 generates an airflow from the duct 40 toward the ventilation passage 81 in the fan unit 30 . Each second fan 31 can change the static pressure inside each fan unit 30 (before the ventilation passage 81) by changing the rotation speed. Assuming that the static pressure of the duct 40 is constant, each second fan 31 can increase the static pressure inside each fan unit 30 (in front of the ventilation passage 81) by increasing the rotation speed. As the static pressure in the fan unit 30 increases, the amount of air SA flowing through the ventilation passage 81 increases. By changing the amount of flowing air in this way, the amount of air supplied to the target space 100 from the outlet 81b of each ventilation passage 81 changes.

The controller 50 includes a main controller 51 and multiple sub-controllers 52 . A controller 50 is configured by connecting a main controller 51 and a plurality of sub-controllers 52 to each other. A main controller 51 controls the output of the first fan 21 . As the output of the first fan 21 increases, the state of the first fan 21 changes so that the amount of air blown by the first fan 21 increases.

One sub-controller 52 is provided for each fan unit 30 . Each sub-controller 52 issues an instruction regarding air volume change to the corresponding second fan 31 . Each sub-controller 52 stores a target air volume. Each sub-controller 52 issues an instruction to increase the number of revolutions of the second fan 31 (instruction on changing the air volume) if the air supply air volume is insufficient for the target air volume. Conversely, the sub-controller 52 issues an instruction to decrease the rotational speed of the second fan 31 (instruction on changing the air volume) if the air supply air volume is excessive with respect to the target air volume.

The controller 50 obtains information on the amount of air supplied to the target space 100 by the plurality of second fans 31 . The information on the amount of air is, for example, the amount of air to be supplied to the target space 100 per second. The required output of the first fan 21 is determined based on the obtained information on the amount of air. The controller 50 controls the output of the first fan 21 so as to achieve the determined required output. Specifically, each sub-controller 52 obtains information on the amount of air in the corresponding fan unit 30 from the corresponding fan unit 30 . Each sub-controller 52 outputs information on the amount of air to the main controller 51 .

In controlling the output of the first fan 21, the controller 50 particularly controls the air volume of the fan unit 30 having at least one of the plurality of second fans 31 having a predetermined rotation speed or less and the second fan 31 having a predetermined rotation speed or less. is greater than or equal to a target value (target air volume value) and the amount of air sent from the air handling unit 20 is less than or equal to the threshold value, the operation of the first fan 21 is stopped. When the operation of the first fan 21 is stopped in such a state, the static pressure of the duct 40 connected to the fan unit 30 is lowered, and even the second fan 31 whose number of revolutions is less than the predetermined speed is sent to the ventilation passage 81. It becomes easy to reduce the air supply air volume.

(2) Detailed configuration (2-1) Air handling unit 20
The air handling unit 20 has a first air volume detection means 23, a temperature sensor 24 and a water volume control valve 25 in addition to the first fan 21 and the heat exchanger 22 already described. Cold water or hot water, for example, is supplied from the heat source unit 60 to the heat exchanger 22 as a heat medium. The heat medium supplied to the heat exchanger 22 may be something other than cold or hot water, such as brine. For example, an air volume sensor, an air velocity sensor, or a differential pressure sensor can be used as the first air volume detection means 23 . The first air volume detection means 23 detects the volume of air blown by the first fan 21 . The first air volume detection means 23 is connected to the main controller 51 . The air volume value detected by the first air volume detection means 23 is transmitted from the first air volume detection means 23 to the main controller 51 . The air volume detected by the first air volume detection means 23 is the air volume flowing through the duct 40 . In other words, the air volume detected by the first air volume detection means 23 is the total amount of air supplied to the target space 100 from the plurality of fan units 30 .

Temperature sensor 24 detects the temperature of air SA sent from first fan 21 to duct 40 . The temperature sensor 24 is connected to the main controller 51 . The temperature value detected by the temperature sensor 24 is transmitted from the temperature sensor 24 to the main controller 51 .

The air handling unit 20 is connected to the target space 100 via the ventilation passage 82 . The air RA returning from the target space 100 through the air passage 82 is sent out to the duct 40 through the heat exchanger 22 by the first fan 21 . When passing through the heat exchanger 22, the air RA exchanges heat with cold or hot water flowing through the heat exchanger 22 to become conditioned air. The amount of heat given to the air SA that is heat-exchanged by the heat exchanger 22 and sent out to the duct 40 is adjusted by the water amount adjustment valve 25 . The degree of opening of the water volume control valve 25 is controlled by the main controller 51 . As the degree of opening of the water amount adjustment valve 25 increases, the amount of water flowing through the heat exchanger 22 increases, and the amount of heat exchanged between the heat exchanger 22 and the air SA per unit time increases. Conversely, if the degree of opening of the water volume control valve 25 is decreased, the volume of water flowing through the heat exchanger 22 is decreased, and the amount of heat exchanged between the heat exchanger 22 and the air SA per unit time is decreased.

(2-2) Fan unit 30
The fan unit 30 has a second air volume detection means 32 in addition to the already explained second fan 31 . The second air volume detection means 32 detects the volume of air blown by the second fan 31 . Each second air volume detection means 32 is connected to one corresponding sub-controller 52 . The air volume value detected by the second air volume detection means 32 is transmitted to the sub-controller 52 . The air volume detected by the second air volume detection means 32 is the air volume flowing through the ventilation passage 81 . In other words, the air volume detected by the second air volume detection means 32 is the air supply volume supplied from each fan unit 30 to the target space 100 . For example, an air volume sensor, an air velocity sensor, or a differential pressure sensor can be used for the second air volume detection means 32 .

(2-3) Controller 50
The controller 50 is implemented by a computer. The controller 50 includes control arithmetic devices 51a and 52a and storage devices 51b and 52b. Processors such as CPUs or GPUs can be used for the control arithmetic units 51a and 52a. The control arithmetic devices 51a and 52a read programs stored in the storage devices 51b and 52b, and perform predetermined image processing and arithmetic processing according to the programs. Furthermore, the control arithmetic units 51a and 52a can write the arithmetic results to the storage devices 51b and 52b and read the information stored in the storage devices 51b and 52b according to the program. FIG. 2 shows various functional blocks implemented by the control arithmetic units 51a and 52a. The storage devices 51b and 52b can be used as databases.
(2-4) Remote sensor 70
The multiple remote sensors 70 have the function of temperature sensors. Each remote sensor 70 is configured to transmit data indicating the temperature of the target space 100 to the corresponding sub-controller 52 .

(3) Operation of Air Conditioning System 10 (3-1) Overview of Operation Each of the plurality of sub-controllers 52 receives the detected temperature value of the target space from the connected remote sensor 70 . Each sub-controller 52 holds data indicating the set temperature. For example, data indicating the set temperature is transmitted in advance to each sub-controller 52 from a remote controller (not shown) or the like. Each sub-controller 52 stores data indicating the set temperature received from a remote controller or the like in a storage device 52b (see FIG. 2) such as a built-in memory. Each sub-controller 52 transmits the set temperature value to the main controller 51 . The main controller 51 determines the target air volume of each fan unit 30 according to the temperature detected by the corresponding remote sensor 70 based on the set temperature. The main controller 51 transmits the value of the target air volume to each sub-controller 52 . Each fan unit 30 has the rotation speed of the second fan 31 adjusted by the corresponding sub-controller 52 .

Each sub-controller 52 controls the number of revolutions of each second fan 31 so that the amount of supplied air coincides with the target amount of air. The multiple sub-controllers 52 control the rotation speeds of the multiple second fans 31 independently of each other. Each sub-controller 52 increases the rotation speed of each second fan 31 if the air volume detected by the second air volume detection means 32 is smaller than the target air volume. Each sub-controller 52 reduces the rotation speed of each second fan 31 if the air volume detected by the second air volume detection means 32 is greater than the target air volume.

(3-2) Characteristic Operation Next, the characteristic operation of the air conditioning system 10 will be described along the flow shown in FIG. A characteristic operation in this air conditioning system 10 is an operation that is performed when the number of revolutions of the second fan 31 becomes equal to or less than a predetermined number of revolutions.

Each sub-controller 52 stores the value of the air volume detected by the second air volume detection means 32 of each corresponding fan unit 30 in the storage device 52b (step ST1). When the number of revolutions of the second fan 31 becomes equal to or less than a predetermined number of revolutions stored in advance in the storage device 52b while air is being supplied from the fan unit 30 to the target space 100, the sub-controller 52 controls the second It is determined that the number of revolutions of the fan 31 has become equal to or less than a predetermined number of revolutions.

The sub-controller 52, having determined that the number of revolutions of the second fan 31 has become equal to or less than the predetermined number of revolutions, determines whether or not the amount of air supplied to the fan unit 30 having the second fan 31 is equal to or greater than the target air amount. The sub-controller 52 that determines that the supplied air volume is equal to or greater than the target air volume transmits to the main controller 51 information that the rotational speed of the second fan 31 is equal to or less than a predetermined rotational speed and the supplied air volume is equal to or greater than the target air volume. This predetermined number of revolutions is, for example, the minimum number of revolutions of the second fan 31 or a value slightly higher than the minimum number of revolutions. Values slightly higher than the minimum rotation speed are, for example, minimum rotation speed x 1.05, minimum rotation speed x 1.1, and minimum rotation speed x 1.2.

The main controller 51 receives the information that the number of revolutions of the second fan 31 is equal to or less than the predetermined number of revolutions and the amount of supplied air is equal to or greater than the target air amount. It is determined whether or not the amount of air sent out from is equal to or less than a threshold (step ST2). This threshold is written in the storage device 51b of the main controller 51 in advance. When determining that the first condition is satisfied (Yes in step ST2), the main controller 51 stops the operation of the first fan 21 (step ST3). After that, with the first fan 21 stopped, the target space 100 is air-conditioned only with the plurality of second fans 31 (step ST4). Here, the first condition is that at least one of the plurality of second fans 31 has a predetermined number of rotations or less, and the supplied air volume of the fan unit 30 having the second fan 31 having the predetermined number of rotations or less is equal to or greater than the target air volume. and that the amount of air delivered from the air handling unit 20 is equal to or less than the threshold. Even if the first fan 21 stops, the plurality of second fans 31 ensure a sufficient amount of air supply to the target space 100 . The reason why a sufficient amount of air is supplied to the target space 100 in this way is that the amount of air sent out from the air handling unit 20 is equal to or less than the threshold value, and even if the first fan 21 stops, a plurality of This is because it has been confirmed in step ST2 that a sufficient amount of supplied air is ensured even with the second fan 31 alone.

The main controller 51 receives preset temperatures set for the temperature of the target space 100 from the plurality of sub-controllers 52 . The main controller 51 receives temperature values detected by the plurality of remote sensors 70 via the sub-controller 52 . The main controller 51 compares the set temperature and the temperature value to see if the temperature value of the target space 100 has reached the set temperature set for at least one fan unit 30 among the plurality of fan units 30. to judge what

Further, the main controller 51 monitors through the sub-controller 52 whether or not the amount of air supplied to the fan unit 30, which has not reached the set temperature, has not reached the target amount of air for a predetermined period of time. This predetermined time is written in the storage device 51b of the main controller 51 in advance. When the following second condition is satisfied (Yes in step ST5), the main controller 51 restarts the operation of the first fan 21 that was stopped due to the satisfaction of the previous first condition ( step ST6). In other words, the operation of the first fan 21 is not restarted unless the first condition is satisfied. For example, when the operation of the first fan 21 is stopped due to detection of a failure of the first fan 21, the operation of the first fan 21 is not restarted even if the second condition is satisfied. The second condition is that the set temperature set for at least one fan unit 30 out of the plurality of fan units 30 has not been reached, and the air supply air volume of at least one fan unit 30 has reached the target air volume value. It is a condition that the state in which it is not in place continues for a predetermined period of time. If there is no instruction to stop the system (No in step ST7), the process returns to the first step ST1 and repeats the operations from step ST1 to step ST7. If there is an instruction to stop the system, this series of operations is terminated.

(4) Modification (4-1) Modification 1A
An outside air introduction unit 110 may be attached to the air handling unit 20 as shown in FIG. The outside air introduction unit 110 has a third fan 111 and a third air volume detection means 112 . The outside air introduction unit 110 takes in the outside air OA from outside the target space 100 and blows it to the air handling unit 20 with the third fan 111 . The third air volume detection means 112 detects the volume of outside air OA sent to the air handling unit 20 . The third air volume detection means 112 transmits the value of the detected air volume of the outside air OA to the main controller 51 . When the outside air OA is sent from the outside air introduction unit 110 to the air handling unit 20, the main controller 51 is configured to stop the third fan 111 when stopping the first fan 21. good too. For example, an air volume sensor, an air velocity sensor, or a differential pressure sensor can be used for the third air volume detection means 112 .

(4-2) Modification 1B
Although the remote sensor 70 has the function of a temperature sensor in the above embodiment, the remote sensor 70 has at least one function of a temperature sensor, a CO ₂ concentration sensor, and a humidity sensor. good too. In other words, the remote sensor 70 can sense at least one of a temperature sensor, a CO ₂ concentration sensor, and a humidity sensor as environmental values. Although the temperature environment is described as the environment handled by the air conditioning system 10 in the above embodiment, the environment handled by the air conditioning system 10 may be at least one of temperature, CO ₂ concentration, and humidity.

When configured in this manner, each of the plurality of sub-controllers 52 receives the detection target of at least one of the temperature, CO ₂ concentration, and humidity of the target space 100 from the connected remote sensor 70 . Receive detection values as environmental values. Each sub-controller 52 holds data of setting values to be detected as setting environment values. Each sub-controller 52 transmits to the main controller 51 the set value of at least one of the temperature, _CO2 concentration and humidity as the set environment value to be controlled. The main controller 51 determines the target air volume of each second unit 30 according to the detection value of the corresponding remote sensor 70 based on the set value. The main controller 51 transmits the value of the target air volume to each sub-controller 52 . Each sub-controller 52 monitors the environmental value by the remote sensor 70 while controlling each second fan 31 so that the air supply volume matches the target air volume. The characteristic operations of the air conditioning system 10 described above are performed using environmental values.

(5) Features (5-1)
In the air conditioning system 10 described above, the controller 50 sets the air volume of the fan unit 30 having at least one of the plurality of second fans 31 having a predetermined rotation speed or less to the target value. When the above and the first condition that the amount of air sent from the air handling unit 20 is equal to or less than the threshold is satisfied, the operation of the first fan 21 is stopped. Stopping the operation of the first fan 21 in this manner makes it easier to reduce the amount of air supplied to the fan unit 30 having the second fan 31 with a rotation speed equal to or lower than the predetermined number of revolutions below the target air amount. By realizing the adjustment when the air volume is small by such control of the controller 50, the need to provide an extra device can be eliminated or the extra device can be simplified, and the adjustment function when the air volume is small can be realized. Cost can be reduced.

(5-2)
In the air-conditioning system 10 of the above-described embodiment, when the minimum rotation speed of the second fan 31 is used as the predetermined rotation speed, the air supply air volume of the fan unit 30 having the second fan 31 having the minimum rotation speed or less is increased from the target air volume value. make it easier to reduce

(5-3)
When the second condition is satisfied, the controller 50 of the air conditioning system 10 described above restarts the operation of the first fan that was stopped when the first condition was satisfied. Here, the second condition is that the environment of the target space 100 does not reach the set environment set for at least one fan unit 30 among the plurality of fan units 30 and the power supply of the one fan unit 30 The condition is that the air volume does not reach the target air volume for a predetermined period of time. By restarting the operation of the first fan 21 by the controller 50, the time required for the air supply air volume of the fan unit 30 to reach the target air volume value is shortened, and the environment of the target space 100 can reach the set environment quickly. become.

Although embodiments of the present disclosure have been described above, it will be appreciated that various changes in form and detail may be made without departing from the spirit and scope of the present disclosure as set forth in the appended claims. .

REFERENCE SIGNS LIST 10 air conditioning system 20 air handling unit 21 first fan 22 heat exchanger 30 fan unit 31 second fan 40 duct 50 controller

JP-A-10-253132

Claims (3)

an air handling unit (20) having a heat exchanger through which a heat transfer medium flows and a first fan (21);
a plurality of fan units (30) each having a second fan (31) for blowing supplied air into the target space;
a duct (40) for distributing supply air delivered by said first fan from said air handling unit to said plurality of fan units;
a controller (50) for controlling the first fan;
with
The controller controls that at least one of the plurality of second fans has a predetermined number of rotations or less, an air volume of the fan unit having the second fan having the predetermined number of rotations or less is a target value or more, and from the air handling unit An air conditioning system (10) for stopping operation of said first fan when a condition is met that the amount of air delivered is equal to or less than a threshold. wherein the predetermined number of revolutions is the minimum number of revolutions of the second fan;
An air conditioning system (10) according to claim 1. The controller determines that the environment of the target space has not reached a set environment set for at least one fan unit among the plurality of fan units, and the air volume of the at least one fan unit has reached a target value. restarting the operation of the first fan that has been stopped by satisfying the condition when the state in which the first fan is stopped continues for a predetermined time;
An air conditioning system (10) according to claim 1 or claim 2.

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