WO2024117261A1

WO2024117261A1 - Air conditioning system and control method

Info

Publication number: WO2024117261A1
Application number: PCT/JP2023/043166
Authority: WO
Inventors: 勇司松本; 徳臣岡崎
Original assignee: 東芝キヤリア株式会社
Priority date: 2022-12-01
Filing date: 2023-12-01
Publication date: 2024-06-06

Abstract

An air conditioning system according to an embodiment comprises an internal conditioner control unit and an external conditioner control unit. If an operating capacity of an external conditioner is equal to or greater than a first threshold and an operating capacity of an internal conditioner can be increased, the internal conditioner control unit increases the operating capacity of the internal conditioner, and if the operating capacity of the external conditioner is less than a second threshold that is smaller than the first threshold and the operating capacity of the internal conditioner can be reduced, the internal conditioner control unit reduces the operating capacity of the internal conditioner. If the operating capacity of the internal conditioner is equal to or greater than a third threshold and the operating capacity of the external conditioner can be increased, the external conditioner control unit increases the operating capacity of the external conditioner, and if the operating capacity of the internal conditioner is less than a fourth threshold that is smaller than the third threshold and the operating capacity of the external conditioner can be reduced, the external conditioner control unit reduces the operating capacity of the external conditioner.

Description

Air conditioning system and control method

The present invention relates to an air conditioning system and a control method.
This application claims priority based on Japanese Patent Application No. 2022-192823, filed in Japan on December 1, 2022, the contents of which are incorporated herein by reference.

In conventional technology, the linked control of indoor and outdoor air conditioners was aimed at reducing power consumption, and involved comparing COP (Coefficient of Performance) and power consumption.

Japanese Patent No. 6414354

As a result, devices and gauges capable of measuring the amount of electricity used are required, which increases the costs of introducing them. Furthermore, when simply comparing COPs, it is often the case that either the indoor or outdoor air-conditioning unit is operating at a high load, or that there is a bias in the operating time. As a result, parts of equipment operating at a high load are more likely to break down, or the maintenance cycle of equipment operating at a high load may be shortened. Thus, with conventional technology, there was an issue of increased running costs for air-conditioning systems due to part replacement due to breakdowns and shortened maintenance cycles.

The problem that this invention aims to solve is to provide an air conditioning system and a control method that reduce the running costs of the air conditioning system.

The air conditioning system of the embodiment includes an indoor air conditioning unit control unit and an outdoor air conditioning unit control unit. The indoor air conditioning unit control unit increases the operating capacity of the indoor air conditioning unit when the operating capacity of the outdoor air conditioning unit is equal to or greater than a first threshold and the operating capacity of the indoor air conditioning unit can be increased, and decreases the operating capacity of the indoor air conditioning unit when the operating capacity of the outdoor air conditioning unit is less than a second threshold that is smaller than the first threshold and the operating capacity of the indoor air conditioning unit can be decreased. The outdoor air conditioning unit control unit increases the operating capacity of the outdoor air conditioning unit when the operating capacity of the indoor air conditioning unit is equal to or greater than a third threshold and the operating capacity of the outdoor air conditioning unit can be increased, and decreases the operating capacity of the outdoor air conditioning unit when the operating capacity of the indoor air conditioning unit is less than a fourth threshold that is smaller than the third threshold and the operating capacity of the outdoor air conditioning unit can be decreased.

FIG. 1 is a diagram showing an example of the configuration of an air conditioning system according to an embodiment. 4 is a flowchart showing a specific example of a processing flow of the air conditioning system in the first embodiment. 10 is a flowchart showing a specific example of a process flow of an air conditioning system in a second embodiment.

The air conditioning system and control method of the embodiment will be described below with reference to the drawings.

FIG. 1 is a diagram showing an example of the configuration of an air conditioning system 17 according to an embodiment. The air conditioning system 17 shown in FIG. 1 is a system that conditions a plurality of spaces (in FIG. 1, two

spaces

23, 24 provided in a building 14). The air conditioning system 17 includes a control unit 10, a direct indoor outdoor unit 12, and a heat source unit 40. The building 14 also includes an air conditioning unit control unit 18, two indoor conditioning units 21, an exhaust duct 16, two VAVs (Variable Air Volume systems) 20, and two remote controls 22. The indoor conditioning units 21, the VAVs 20, and the remote controls 22 are provided in the

spaces

23, 24, respectively.

The direct indoor air outdoor unit 12 adjusts the temperature of the inside air in the

spaces

23 and 24. The remote control 22 is used to set the start and stop of operation, the air volume, temperature, etc. The settings are output to the control unit 10. The control unit 10 controls the operating state of the outdoor air conditioning unit 31 and the direct indoor air outdoor unit 12 according to the settings made on the remote control 22, the temperature and humidity of the outside air and the inside air, etc.

The exhaust duct 16 is connected to exhaust ports (not shown) provided in the

spaces

23 and 24. The exhaust duct 16 is a duct for exhausting the air in the

spaces

23 and 24 to the outside via the building 15.

The building 15 is equipped with a ventilation fan 26, an outdoor air conditioning unit control unit 27, an outdoor air conditioning unit 31, and an air intake 34. The ventilation fan 26 exhausts air from the exhaust duct 16 described above. The outdoor air conditioning unit control unit 27 controls the outdoor air conditioning unit 31. The air intake 34 takes in outside air into the outdoor air conditioning unit 31.

The outdoor air-conditioning unit 31 includes an outdoor air-conditioning unit blower 29, a humidifier 30, and a water coil 32. The outdoor air-conditioning unit 31 takes in outside air from an air intake 34 via an air intake duct 28. The outdoor air-conditioning unit 31 conditions (cools, heats, dehumidifies, or humidifies) the outside air that it has taken in. The outdoor air-conditioning unit 31 supplies the conditioned outside air from the VAV 20 via an air supply duct 25 to the

spaces

23, 24. The outdoor air-conditioning unit 31 exhausts the air from the

spaces

23, 24 to the outside of the building 13 via an exhaust duct 16 using a ventilation fan 26.

The water coil 32 is connected to the heat source unit 40. The water coil 32 is a heat exchanger that functions as a cooler for outdoor air. The water coil 32 has a heat transfer tube and heat transfer fins. In the water coil 32, heat exchange occurs between the outdoor air passing around the heat transfer tube and heat transfer fins and the heat medium passing through the heat transfer tube. The humidifier 30 humidifies the outdoor air that has passed through the water coil 32. The outdoor air conditioning unit blower 29 is a blower that takes in outdoor air into the outdoor air conditioning unit 31 and sends it to the intake air duct 25.

Various sensors are provided in the outdoor air-conditioning unit 31. Examples of sensors provided in the outdoor air-conditioning unit 31 include an outdoor air temperature sensor and an outdoor air humidity sensor that detect the temperature and humidity of the outdoor air drawn into the outdoor air-conditioning unit 31. Another example of a sensor provided in the outdoor air-conditioning unit 31 is a sensor that detects the temperature of the supply air sent to the supply air duct 25.

The air supply duct 25 obtains outside air by the air blown by the outdoor air conditioner blower 29. The air supply duct 25 is connected to the outdoor air conditioner 31 and the VAV 20. The outdoor air conditioner control unit 27 is composed of a calculation device, a storage device, various electrical components, etc. The outdoor air conditioner control unit 27 is electrically connected to the control unit 10 and the remote control 22 via a communication line. The outdoor air conditioner control unit 27 controls the operating capacity of the outdoor air conditioner 31 according to the settings made by the remote control and the temperature of the intake outside air.

The direct indoor air conditioner outdoor unit 12 generally comprises multiple outdoor units and multiple (two in FIG. 1) indoor air conditioners 21. The outdoor units are connected to the indoor air conditioners 21 via refrigerant connection pipes 19. Various sensors are provided in the outdoor units and the indoor air conditioners 21. Examples of sensors provided in the outdoor units include a suction pressure sensor that detects the pressure of the refrigerant sucked into the compressor, and a discharge pressure sensor that detects the pressure of the refrigerant discharged from the compressor. Examples of sensors provided in the indoor air conditioner 21 include sensors that detect the temperature, humidity, and carbon dioxide concentration of the indoor air sucked into the indoor air conditioner 21.

The air conditioner control unit 18 is an example of an indoor control unit control unit. The air conditioner control unit 18 is composed of a calculation unit, a storage device, various electrical components, etc. The air conditioner control unit 18 is connected to the direct indoor outdoor unit 12, the indoor conditioning unit 21, the sensors of the indoor conditioning unit 21, and the remote control 22 via communication lines. The air conditioner control unit 18 controls the operating capacity of the direct indoor outdoor unit 12 and the indoor conditioning unit 21 according to the settings made by the remote control and the indoor temperature.

The control unit 10 controls the entire air conditioning system 17. The control unit 10 is composed of a calculation device and a storage device.

The communication lines L1, L2, and L3 are communication lines for communication between the air conditioner control unit 18 and the outdoor control unit 27. The air conditioner control unit 18 communicates via the direct indoor outdoor unit 12. The outdoor control unit 27 communicates via the heat source unit 40. There are a first communication form using the communication line L1 and a second communication form using the communication lines L2 and L3 as forms of communication between the air conditioner control unit 18 and the outdoor control unit 27. The first communication form is a form in which communication is performed directly without going through the control unit 10. When communication is performed in the first communication form, the communication lines L2 and L3 are not required. The second communication form is a form in which the direct indoor outdoor unit 12 and the control unit 10 are connected by the communication line L2, and the heat source unit 40 and the control unit 10 are connected by the communication line L3. In this way, the second communication form is a form in which communication is performed via the control unit 10. When communication is performed in the second communication form, the communication line L1 is not required. As for the communication method, it is sufficient that the air conditioner control unit 18 and the outdoor air conditioner control unit 27 can communicate with each other, and a general-purpose protocol such as Modbus may be used.

Based on the above configuration, a first embodiment and a second embodiment will be described.
[First embodiment]
In the first embodiment, in a first communication form, the air conditioner control unit 18 and the outdoor air conditioner control unit 27 are capable of communicating with each other. The air conditioner control unit 18 is configured to be able to acquire the operating capacity of the outdoor air conditioner 31 through communication. The outdoor air conditioner control unit 27 is configured to be able to acquire the operating capacity of the indoor air conditioner 21 through communication.

The air conditioner control unit 18 is preset with a first threshold T1 for comparison with the operating capacity of the outdoor air conditioner 31 and a second threshold T2 smaller than the first threshold T1. The first threshold T1 and the second threshold T2 are stored in the storage device of the air conditioner control unit 18. The first threshold T1 and the second threshold T2 are set, for example, via the control unit 10. When the operating capacity of the outdoor air conditioner 31 is equal to or greater than the first threshold T1 and the operating capacity of the indoor air conditioner 21 can be increased, the air conditioner control unit 18 increases the operating capacity of the indoor air conditioner 21. When the operating capacity of the outdoor air conditioner 31 is less than the second threshold T2 and the operating capacity of the indoor air conditioner 21 can be reduced, the air conditioner control unit 18 reduces the operating capacity of the indoor air conditioner 21. The control to reduce the operating capacity of the indoor air conditioner 21 also includes control to stop the operation of the indoor air conditioner 21.

The outdoor air conditioning unit control unit 27 is preset with a third threshold T3 for comparison with the operating capacity of the indoor air conditioning unit 21, and a fourth threshold T4 smaller than the third threshold T3. The third threshold T3 and the fourth threshold T4 are stored in the storage device of the outdoor air conditioning unit control unit 27. The third threshold T3 and the fourth threshold T4 are set, for example, via the control unit 10. The outdoor air conditioning unit control unit 27 increases the operating capacity of the outdoor air conditioning unit 31 when the operating capacity of the indoor air conditioning unit 21 is equal to or greater than the third threshold T3 and the operating capacity of the outdoor air conditioning unit 31 can be increased. In addition, the outdoor air conditioning unit control unit 27 reduces the operating capacity of the outdoor air conditioning unit 31 when the operating capacity of the indoor air conditioning unit 21 is less than the fourth threshold T4 and the operating capacity of the outdoor air conditioning unit 31 can be reduced. The control to reduce the operating capacity of the outdoor air conditioning unit 31 also includes control to stop the operation of the outdoor air conditioning unit 31.

Figure 2 is a flowchart showing the processing flow of the air conditioning system 17 in the first embodiment. The air conditioner control unit 18 determines whether the operating capacity of the outdoor air conditioner 31 is equal to or greater than the threshold T1 (step S101). If the operating capacity of the outdoor air conditioner 31 is equal to or greater than the threshold T1 (step S101: YES) and the operating capacity of the indoor air conditioner 21 can be increased, the air conditioner control unit 18 increases the operating capacity of the indoor air conditioner 21 (step S102) and proceeds to step S105.

If the operating capacity of the outdoor air-conditioning unit 31 is not equal to or greater than the threshold T1 (step S101: NO), the air-conditioning unit control unit 18 determines whether the operating capacity of the outdoor air-conditioning unit 31 is less than the threshold T2 (step S102). If the operating capacity of the outdoor air-conditioning unit 31 is less than the threshold T2 (step S103: YES) and the operating capacity of the indoor air-conditioning unit 21 can be reduced, the air-conditioning unit control unit 18 reduces the operating capacity of the indoor air-conditioning unit 21 (step S104) and proceeds to step S105. If the operating capacity of the outdoor air-conditioning unit 31 is not less than the threshold T2 (step S103: NO), proceeds to step S105.

The outdoor air-conditioning unit control unit 27 determines whether the operating capacity of the indoor air-conditioning unit 21 is equal to or greater than the threshold value T3 (step S105). If the operating capacity of the indoor air-conditioning unit 21 is equal to or greater than the threshold value T3 (step S105: YES) and the operating capacity of the outdoor air-conditioning unit 31 can be increased, the outdoor air-conditioning unit control unit 27 increases the operating capacity of the outdoor air-conditioning unit 31 (step S106) and ends the process.

If the operating capacity of the indoor processing unit 21 is not equal to or greater than the threshold T3 (step S105: NO), the outdoor processing unit control unit 27 determines whether the operating capacity of the indoor processing unit 21 is less than the threshold T4 (step S107). If the operating capacity of the indoor processing unit 21 is less than the threshold T4 (step S107: YES) and the operating capacity of the outdoor processing unit 31 can be reduced, the outdoor processing unit control unit 27 reduces the operating capacity of the outdoor processing unit 31 (step S108) and ends the process. If the operating capacity of the indoor processing unit 21 is not less than the threshold T4 (step S107: NO), the process ends.

The process shown in FIG. 2 above may be a loop process that returns to step S101 after step S106 or step S108 is completed, rather than ending at step S106 or step S108. Alternatively, this process may be repeated periodically (e.g., every minute). This process may be performed in response to an instruction from an operator of the air conditioning system 17.

The above is the basic processing flow in the first embodiment. As shown in the flowchart in FIG. 2, the purpose of the processing in this embodiment is to prevent the load from being biased toward either the outdoor air-conditioning unit 31 or the indoor air-conditioning unit 21. If it is possible to prevent the load from being biased toward either the outdoor air-conditioning unit 31 or the indoor air-conditioning unit 21, processing may be added or changed to the processing shown in the flowchart in FIG. 2.

Specifically, a processing example in which the thresholds T1 and T3 are set to an operating capacity of 80% and the thresholds T2 and T4 are set to an operating capacity of 70% will be described. First, when the operating capacity of the indoor unit 21 becomes 80% or more, if the set dehumidification performance is obtained, the air conditioner control unit 18 increases the air volume of the indoor unit 21, and the outdoor unit control unit 27 increases the operating capacity of the outdoor unit. When the operating capacity of the indoor unit 21 is less than the threshold T1 and is equal to or greater than the threshold T3, the outdoor unit control unit 27 does not perform air volume correction control, but controls so as to equalize the operating capacity with the indoor unit 21. When the operating capacity of the outdoor unit 31 becomes less than 70%, the air conditioner control unit 18 gradually reduces the air volume correction and transitions to normal control. The normal control here refers to the control of the direct indoor outdoor unit 12 and the indoor unit 21, which is performed according to the settings made by the remote control and the indoor temperature.

For example, if the operating capacity of the indoor air-conditioning unit 21 is 80% or more, and the operating capacity of the outdoor air-conditioning unit 31 is 100%, the operating capacity of the outdoor air-conditioning unit 31 cannot be increased. However, if the ventilation air volume is sufficient, the outdoor air-conditioning unit control unit 27 reduces the load on the outdoor air-conditioning unit 31 (reducing the air volume, changing the set temperature of the heat source unit, and reducing the water flow rate). This increases the load on the indoor air-conditioning unit 21, but since the load on the outdoor air-conditioning unit 31 can be reduced, it is possible to prevent the load from being biased towards either the outdoor air-conditioning unit 31 or the indoor air-conditioning unit 21.

By controlling in this way, it is possible to prevent the load from being biased towards either the outdoor air-conditioning unit 31 or the indoor air-conditioning unit 21. This makes it possible to prevent parts of equipment operating at high load from becoming more susceptible to failure and to prevent the maintenance cycle of equipment operating at high load from being shortened, thereby reducing the running costs of the air-conditioning system.

[Second embodiment]
In the second embodiment, the air conditioner control unit 18 and the outdoor air conditioner control unit 27 are capable of communicating with each other in the first communication form or the second communication form. The air conditioner control unit 18 is configured to be able to acquire the operating capacity of the outdoor air conditioner 31 through communication. The outdoor air conditioner control unit 27 is configured to be able to acquire the operating capacity of the indoor air conditioner 21 through communication.

A predetermined value A (>0) is preset in the air conditioner control unit 18 for comparing the difference between the operating capacity of the outdoor air conditioner 31 and the operating capacity of the indoor air conditioner 21. The predetermined value A is stored in the storage device of the air conditioner control unit 18. Similarly, the above-mentioned predetermined value A is preset in the outdoor air conditioner control unit 27. The predetermined value A is stored in the storage device of the outdoor air conditioner control unit 27. The predetermined value A is set, for example, via the control unit 10.

The air conditioner control unit 18 increases the operating capacity of the indoor control unit 21 when the difference between the operating capacity X of the outdoor control unit 31 and the operating capacity Y of the indoor control unit 21 is equal to or greater than a predetermined value A (X-Y≧A) and it is possible to increase the operating capacity of the indoor control unit 21. The air conditioner control unit 18 also reduces the operating capacity of the indoor control unit 21 when the difference between the operating capacity X of the outdoor control unit 31 and the operating capacity of the indoor control unit 21 is less than a predetermined value (X-Y<A) and it is possible to reduce the operating capacity of the indoor control unit 21. Control to reduce the operating capacity of the indoor control unit 21 also includes control to stop the operation of the indoor control unit 21.

The outdoor air-conditioning unit control unit 27 increases the operating capacity of the outdoor air-conditioning unit 31 when the difference between the operating capacity Y of the indoor air-conditioning unit 21 and the operating capacity X of the outdoor air-conditioning unit 31 is equal to or greater than a predetermined value A (Y-X≧A) and the operating capacity of the outdoor air-conditioning unit 31 can be increased. The outdoor air-conditioning unit control unit 27 also reduces the operating capacity of the outdoor air-conditioning unit 31 when the difference between the operating capacity Y of the indoor air-conditioning unit 21 and the operating capacity of the outdoor air-conditioning unit 31 is less than a predetermined value (Y-X<A) and the operating capacity of the outdoor air-conditioning unit 31 can be reduced. Control to reduce the operating capacity of the outdoor air-conditioning unit 31 also includes control to stop the operation of the outdoor air-conditioning unit 31.

Figure 3 is a flowchart showing the processing flow of the air conditioning system 17 in the second embodiment. In the flowchart of Figure 3, the difference (X-Y) between the operating capacity X of the outdoor air-conditioning unit 31 and the operating capacity Y of the indoor air-conditioning unit 21 is designated as Z. The difference (Y-X) between the operating capacity Y of the indoor air-conditioning unit 21 and the operating capacity X of the outdoor air-conditioning unit 31 is designated as W.

The air conditioner control unit 18 determines whether the difference Z between the operating capacity X of the outdoor air conditioner 31 and the operating capacity Y of the indoor air conditioner 21 is equal to or greater than a predetermined value A (step S201). If the difference Z between the operating capacity X of the outdoor air conditioner 31 and the operating capacity Y of the indoor air conditioner 21 is equal to or greater than the predetermined value A (step S201: YES) and the operating capacity of the indoor air conditioner 21 can be increased, the air conditioner control unit 18 increases the operating capacity of the indoor air conditioner 21 (step S202) and proceeds to step S205.

If the difference Z between the operating capacity X of the outdoor air-conditioning unit 31 and the operating capacity Y of the indoor air-conditioning unit 21 is not equal to or greater than the predetermined value A (step S201: NO), the air-conditioning unit control unit 18 determines whether the difference Z between the operating capacity X of the outdoor air-conditioning unit 31 and the operating capacity Y of the indoor air-conditioning unit 21 has become less than the predetermined value A from a state in which it was equal to or greater than the predetermined value A (step S203). If the difference Z between the operating capacity X of the outdoor air-conditioning unit 31 and the operating capacity Y of the indoor air-conditioning unit 21 has become less than the predetermined value A from a state in which it was equal to or greater than the predetermined value A (step S203: YES), and if it is possible to reduce the operating capacity of the indoor air-conditioning unit 21, the air-conditioning unit control unit 18 reduces the operating capacity of the indoor air-conditioning unit 21 (step S204) and proceeds to step S205. If the difference Z between the operating capacity X of the outdoor air-conditioning unit 31 and the operating capacity Y of the indoor air-conditioning unit 21 has not become less than the predetermined value A from a state in which it was equal to or greater than the predetermined value A (step S203: NO), proceeds to step S205.

The outdoor air-conditioning unit control unit 27 determines whether the difference W between the operating capacity Y of the indoor air-conditioning unit 21 and the operating capacity X of the outdoor air-conditioning unit 31 is equal to or greater than a predetermined value A (step S205). If the difference W between the operating capacity Y of the indoor air-conditioning unit 21 and the operating capacity X of the outdoor air-conditioning unit 31 is equal to or greater than the predetermined value A (step S205: YES) and the operating capacity of the outdoor air-conditioning unit 31 can be increased, the outdoor air-conditioning unit control unit 27 increases the operating capacity of the outdoor air-conditioning unit 31 (step S206) and ends the process.

If the difference W between the operating capacity Y of the indoor unit 21 and the operating capacity X of the outdoor unit 31 is not equal to or greater than the predetermined value A (step S205: NO), the outdoor unit control unit 27 determines whether the difference W between the operating capacity Y of the indoor unit 21 and the operating capacity X of the outdoor unit 31 has become less than the predetermined value A from a state in which it was equal to or greater than the predetermined value A (step S207). If the difference W between the operating capacity Y of the indoor unit 21 and the operating capacity X of the outdoor unit 31 has become less than the predetermined value A from a state in which it was equal to or greater than the predetermined value A (step S207: YES), and the operating capacity of the outdoor unit 31 can be reduced, the outdoor unit control unit 27 reduces the operating capacity of the outdoor unit 31 (step S208) and ends the process. If the difference W between the operating capacity Y of the indoor unit 21 and the operating capacity X of the outdoor unit 31 has not become less than the predetermined value A from a state in which it was equal to or greater than the predetermined value A (step S207: NO), the process ends.

The process shown in FIG. 3 above may be performed periodically (e.g., every minute) or in response to an instruction from an operator of the air conditioning system 17.

The above is the basic processing flow in the second embodiment. As shown in the flowchart in FIG. 3, the purpose of the processing in this embodiment is to prevent the load from being biased toward either the outdoor air-conditioning unit 31 or the indoor air-conditioning unit 21. If it is possible to prevent the load from being biased toward either the outdoor air-conditioning unit 31 or the indoor air-conditioning unit 21, processing may be added or changed to the processing shown in the flowchart in FIG. 3.

Specifically, a processing example in which the predetermined value A is set to 20% will be described. When the difference W between the operating capacity Y of the indoor air conditioner 21 and the operating capacity X of the outdoor air conditioner 31 is 20% or more, it is assumed that this is the operating capacity at which the dehumidification performance of the outdoor air conditioner 31 can be obtained. In this case, the outdoor air conditioner control unit 27 increases the operating capacity of the outdoor air conditioner 31 by increasing the air volume of the outdoor air conditioner 31 or lowering the blowing temperature. This equalizes the load, so that it is possible to prevent the load from being biased toward either the outdoor air conditioner 31 or the indoor air conditioner 21. When the difference W between the operating capacity Y of the indoor air conditioner 21 and the operating capacity X of the outdoor air conditioner 31 becomes less than 20% from a state of 20% or more, the air conditioner control unit 18 stops the operation of the indoor air conditioner 21, and the outdoor air conditioner control unit 27 controls only the outdoor air conditioner 31 in a normal manner. The normal control here refers to the control by the outdoor air conditioner control unit 27 that is performed according to the settings by the remote control or the temperature of the intake outdoor air. In this way, by stopping the outdoor air conditioning unit 31 and the indoor air conditioning unit 21, whichever is more heavily loaded, the operating time of the heavily loaded equipment is reduced.

In this way, it is possible to prevent the load from being biased towards either the outdoor air-conditioning unit 31 or the indoor air-conditioning unit 21. This makes it possible to prevent parts of equipment operating at high load from becoming more susceptible to failure and to prevent the maintenance cycle of equipment operating at high load from being shortened, thereby reducing the running costs of the air-conditioning system.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments and their modifications are within the scope of the invention and its equivalents as set forth in the claims, as well as the scope and gist of the invention.

10...control unit, 12...direct indoor outdoor unit, 14, 15...building, 16...exhaust duct, 17...air conditioning system, 18...air conditioning unit control unit, 19...refrigerant connection pipe, 21...indoor air conditioning unit, 22...remote control, 23, 24...space, 25...air supply duct, 26...ventilation fan, 27...outdoor air conditioning unit control unit, 28...intake duct, 29...outdoor air conditioning unit blower, 30...humidifier, 31...outdoor air conditioning unit, 32...water coil, 34...intake port, 40...heat source unit, L1, L2, L3...communication line

Claims

An air conditioning system including an indoor air conditioning unit and an outdoor air conditioning unit,
an indoor-conditioning unit control unit that increases the operating capacity of the indoor-conditioning unit when the operating capacity of the outdoor-conditioning unit is equal to or greater than a first threshold value and the operating capacity of the indoor-conditioning unit can be increased, and that reduces the operating capacity of the indoor-conditioning unit when the operating capacity of the outdoor-conditioning unit is less than a second threshold value that is smaller than the first threshold value and the operating capacity of the indoor-conditioning unit can be reduced;
an outdoor air-conditioning unit control unit that increases the operating capacity of the outdoor air-conditioning unit when the operating capacity of the indoor air-conditioning unit is equal to or greater than a third threshold and the operating capacity of the outdoor air-conditioning unit can be increased, and that reduces the operating capacity of the outdoor air-conditioning unit when the operating capacity of the indoor air-conditioning unit is less than a fourth threshold that is smaller than the third threshold and the operating capacity of the outdoor air-conditioning unit can be reduced;
Equipped with an air conditioning system.
An air conditioning system including an indoor air conditioning unit and an outdoor air conditioning unit,
an indoor processing unit control unit that increases the operating capacity of the indoor processing unit when the difference between the operating capacity of the outdoor processing unit and the operating capacity of the indoor processing unit becomes equal to or greater than a predetermined value and the operating capacity of the indoor processing unit can be increased, and that decreases the operating capacity of the indoor processing unit when the difference between the operating capacity of the outdoor processing unit and the operating capacity of the indoor processing unit becomes less than the predetermined value and the operating capacity of the indoor processing unit can be decreased;
an outdoor air-conditioning unit control unit that increases the operating capacity of the outdoor air-conditioning unit when the difference between the operating capacity of the indoor air-conditioning unit and the operating capacity of the outdoor air-conditioning unit becomes equal to or greater than a predetermined value and the operating capacity of the outdoor air-conditioning unit can be increased, and that decreases the operating capacity of the indoor air-conditioning unit when the difference between the operating capacity of the indoor air-conditioning unit and the operating capacity of the outdoor air-conditioning unit becomes less than the predetermined value and the operating capacity of the outdoor air-conditioning unit can be decreased;
Equipped with an air conditioning system.
A control method for an air conditioning system including an indoor air conditioning unit and an outdoor air conditioning unit,
When the operating capacity of the outdoor air-conditioning unit is equal to or greater than a first threshold value and the operating capacity of the indoor air-conditioning unit can be increased, the operating capacity of the indoor air-conditioning unit is increased, and when the operating capacity of the outdoor air-conditioning unit is less than a second threshold value that is smaller than the first threshold value and the operating capacity of the indoor air-conditioning unit can be decreased, the operating capacity of the indoor air-conditioning unit is decreased;
A control method for increasing the operating capacity of the outdoor air-conditioning unit when the operating capacity of the indoor air-conditioning unit becomes equal to or greater than a third threshold value and the operating capacity of the outdoor air-conditioning unit can be increased, and for decreasing the operating capacity of the outdoor air-conditioning unit when the operating capacity of the indoor air-conditioning unit becomes less than a fourth threshold value that is smaller than the third threshold value and the operating capacity of the outdoor air-conditioning unit can be decreased.
A control method for an air conditioning system including an indoor air conditioning unit and an outdoor air conditioning unit,
When the difference between the operating capacity of the outdoor air-conditioning unit and the operating capacity of the indoor air-conditioning unit becomes equal to or greater than a predetermined value and the operating capacity of the indoor air-conditioning unit can be increased, the operating capacity of the indoor air-conditioning unit is increased, and when the difference between the operating capacity of the outdoor air-conditioning unit and the operating capacity of the indoor air-conditioning unit becomes less than the predetermined value and the operating capacity of the indoor air-conditioning unit can be decreased, the operating capacity of the indoor air-conditioning unit is decreased;
A control method for increasing the operating capacity of the outdoor air-conditioning unit when the difference between the operating capacity of the indoor air-conditioning unit and the operating capacity of the outdoor air-conditioning unit becomes equal to or greater than a predetermined value and the operating capacity of the outdoor air-conditioning unit can be increased, and for decreasing the operating capacity of the indoor air-conditioning unit when the difference between the operating capacity of the indoor air-conditioning unit and the operating capacity of the outdoor air-conditioning unit becomes less than the predetermined value and the operating capacity of the outdoor air-conditioning unit can be decreased.