Air conditioning system and control method

Abstract

An air conditioning system according to an embodiment is provided with an internal conditioner control unit and an external conditioner control unit. When the operating capacity of the external regulator is equal to or greater than a first threshold value and the operating capacity of the internal regulator can be increased, the internal regulator control unit increases the operating capacity of the internal regulator. When the operating capacity of the external regulator is smaller than a second threshold value smaller than the first threshold value and the operating capacity of the internal regulator can be reduced, the operating capacity of the internal regulator is reduced. When the operating capacity of the internal regulator is equal to or greater than a third threshold value and the operating capacity of the external regulator can be increased, the external regulator control unit increases the operating capacity of the external regulator. When the operating capacity of the internal regulator is smaller than a fourth threshold value smaller than the third threshold value and the operating capacity of the external regulator can be reduced, the operating capacity of the external regulator is reduced.

Description

Technical Field

[0001] The present invention relates to an air conditioning system and a control method.

[0002] This application claims priority based on Japanese Patent Application No. 2022-192823 filed in Japan on December 1, 2022, and incorporates its content herein. Background Art

[0003] In the prior art, the interlocking control of the internal conditioner and the external conditioner aims to reduce the power consumption, and performs control by comparing the COP (Coefficient of Performance) or the power.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent No. 6414354 Gazette Summary of the Invention

[0007] Technical Problem to be Solved by the Invention

[0008] Therefore, equipment or measuring instruments capable of measuring the power consumption are required, and thus their introduction costs increase. And, in the case of only comparing the COP, in most cases, one of the internal conditioner and the external conditioner becomes high-load operation, or a deviation in the operation time occurs. As a result, the components of the equipment that becomes high-load operation are likely to fail, or the maintenance cycle of the equipment that becomes high-load operation is shortened. Thus, in the prior art, there is a technical problem that the operating cost of the air conditioning system increases due to component replacement or shortening of the maintenance cycle caused by failures.

[0009] The technical problem to be solved by the present invention is to provide an air conditioning system and a control method that suppress the operating cost of the air conditioning system.

[0010] Solutions for Solving the Above Technical Problem

[0011] The air conditioning system of the embodiment includes an internal conditioner control unit and an external conditioner control unit. When the operating capacity of the external conditioner is equal to or greater than a first threshold value and the operating capacity of the internal conditioner can be increased, the internal conditioner control unit increases the operating capacity of the internal conditioner. When the operating capacity of the external conditioner is less than a second threshold value smaller than the first threshold value and the operating capacity of the internal conditioner can be decreased, the internal conditioner control unit decreases the operating capacity of the internal conditioner. When the operating capacity of the internal conditioner is equal to or greater than a third threshold value and the operating capacity of the external conditioner can be increased, the external conditioner control unit increases the operating capacity of the external conditioner. When the operating capacity of the internal conditioner is less than a fourth threshold value smaller than the third threshold value and the operating capacity of the external conditioner can be decreased, the external conditioner control unit decreases the operating capacity of the external conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 FIG. is a diagram showing a configuration example of the air conditioning system of the embodiment.

[0013] Figure 2 FIG. is a flowchart showing a specific example of the process of the air conditioning system in the first embodiment.

[0014] Figure 3 FIG. is a flowchart showing a specific example of the process of the air conditioning system in the second embodiment. DETAILED DESCRIPTION OF THE EMBODIMENT

[0015] Hereinafter, the air conditioning system and control method of the embodiment will be described with reference to the drawings.

[0016] Figure 1 FIG. is a diagram showing a configuration example of the air conditioning system 17 of the embodiment. Figure 1 The illustrated air conditioning system 17 is a system for air conditioning multiple spaces (in Figure 1 are two spaces 23 and 24 provided in the building 14). The air conditioning system 17 includes a control unit 10, a direct expansion outdoor unit 12, and a heat source machine 40. In addition, the building 14 is provided with an air conditioner control unit 18, two internal conditioners 21, an exhaust duct 16, two VAVs (Variable Air Volume systems), and two remote controllers 22. One internal conditioner 21, one VAV 20, and one remote controller 22 are provided in each of the spaces 23 and 24.

[0017] The direct expansion outdoor unit 12 adjusts the temperature of the internal air in spaces 23 and 24. The remote controller 22 sets the start or stop of operation, the air volume, the temperature, etc. The set content is output to the control unit 10. The control unit 10 controls the operating states of the external conditioner 31 and the direct expansion outdoor unit 12 according to the content set by the remote controller 22, the external air, the temperature or humidity of the internal air, etc.

[0018] The exhaust duct 16 is connected to an unillustrated exhaust port provided in spaces 23 and 24. The exhaust duct 16 is a duct for exhausting the air in spaces 23 and 24 to the outside via the building 15.

[0019] The building 15 is equipped with a ventilation fan 26, an external conditioner control unit 27, an external conditioner 31, and an air intake 34. The ventilation fan 26 exhausts the air in the exhaust duct 16. The external conditioner control unit 27 controls the external conditioner 31. The air intake 34 takes in the external air into the external conditioner 31.

[0020] The external conditioner 31 includes an external conditioner blower 29, a humidifier 30, and a water coil 32. The external conditioner 31 takes in the external air from the air intake 34 via the intake duct 28 into the external conditioner 31. The external conditioner 31 adjusts (cools, heats, dehumidifies, or humidifies) the inhaled external air. The external conditioner 31 supplies the conditioned external air to spaces 23 and 24 from the VAV 20 via the supply duct 25. The external conditioner 31 exhausts the air from spaces 23 and 24 to the outside of the building 13 via the exhaust duct 16 through the ventilation fan 26.

[0021] The water coil 32 is connected to the heat source machine 40. The water coil 32 is a heat exchanger that functions as a cooler for the external air. The water coil 32 has heat transfer tubes and heat transfer fins. In the water coil 32, heat exchange takes place between the external air passing around the heat transfer tubes and heat transfer fins and the heat medium passing through the heat transfer tubes. The humidifier 30 humidifies the external air that has passed through the water coil 32. The external conditioner blower 29 is a blower that takes in the external air into the external conditioner 31 and conveys it to the supply duct 25.

[0022] Various sensors are provided in the external conditioner 31. As the sensors provided in the external conditioner 31, examples include an external air temperature sensor or an external air humidity sensor that detects the temperature and humidity of the external air inhaled into the external conditioner 31. In addition, as the sensors provided in the external conditioner 31, an example includes a sensor that detects the supply air temperature conveyed to the supply duct 25.

[0023] The air supply pipe 25 obtains outside air through the air supply of the external regulating machine blower 29. The air supply pipe 25 is connected to the external regulating machine 31 and the VAV 20. The external regulating machine control unit 27 is composed of an arithmetic device, a storage device, various electrical components, etc. The external regulating machine control unit 27 is electrically connected to the control unit 10 or the remote controller 22 via a communication line. The external regulating machine control unit 27 controls the operating capacity of the external regulating machine 31 according to the setting of the remote controller or the temperature of the inhaled outside air.

[0024] The direct expansion outdoor unit 12 usually includes a plurality of outdoor units and a plurality of (two in Figure 1 this case) internal regulating machines 21. The outdoor unit is connected to the internal regulating machine 21 via the refrigerant connecting pipe 19. Various sensors are provided on the outdoor unit and the internal regulating machine 21. As the sensor provided on the outdoor unit, an intake pressure sensor for detecting the pressure of the refrigerant inhaled into the compressor or a discharge pressure sensor for detecting the pressure of the refrigerant discharged from the compressor can be cited. As the sensor provided on the internal regulating machine 21, a sensor for detecting the temperature, humidity and carbon dioxide concentration of the internal air inhaled into the internal regulating machine 21 can be cited.

[0025] The air conditioner control unit 18 is an example of the internal regulating machine control unit. The air conditioner control unit 18 is composed of an arithmetic device, a storage device, various electrical components, etc. The air conditioner control unit 18 is connected to the direct expansion outdoor unit 12, the internal regulating machine 21 or the sensor of the internal regulating machine 21, and the remote controller 22 via a communication line. The air conditioner control unit 18 controls the operating capacity of the direct expansion outdoor unit 12 or the internal regulating machine 21 according to the setting of the remote controller or the indoor temperature.

[0026] The control unit 10 controls the entire air conditioning system 17. The control unit 10 is composed of an arithmetic device and a storage device.

[0027] Communication lines L1, L2, and L3 are communication lines for the air conditioner control unit 18 to communicate with the external conditioner control unit 27. The air conditioner control unit 18 communicates via the direct expansion outdoor unit 12. In addition, the external conditioner control unit 27 communicates via the heat source unit 40. As a communication method between the air conditioner control unit 18 and the external conditioner control unit 27, there are a first communication method using the communication line L1 and a second communication method using the communication lines L2 and L3. The first communication method is a method of directly communicating without passing through the control unit 10. In the case of communicating in the first communication method, the communication lines L2 and L3 are not required. The second communication method is a method in which the direct expansion outdoor unit 12 is connected to the control unit 10 via the communication line L2 and the heat source unit 40 is connected to the control unit 10 via the communication line L3. Thus, the second communication method is a method of communicating via the control unit 10. In the case of communicating in the second communication method, the communication line L1 is not required. In addition, regarding the communication method, as long as the air conditioner control unit 18 and the external conditioner control unit 27 can communicate, for example, a general protocol such as Modbus can also be used.

[0028] Based on the above configuration, the first embodiment and the second embodiment will be described.

[0029] [First Embodiment]

[0030] In the first embodiment, in the first communication method, it is assumed that the air conditioner control unit 18 and the external conditioner control unit 27 can communicate. The air conditioner control unit 18 is configured to be able to obtain the operating capacity of the external conditioner 31 through communication. The external conditioner control unit 27 is configured to be able to obtain the operating capacity of the internal conditioner 21 through communication.

[0031] In the air conditioner control unit 18, a first threshold value T1 for comparing with the operating capacity of the external conditioner 31 and a second threshold value T2 smaller than the first threshold value T1 are preset. The first threshold value T1 and the second threshold value T2 are stored in the storage device of the air conditioner control unit 18. The first threshold value T1 and the second threshold value T2 are set via the control unit 10, for example. When the operating capacity of the external conditioner 31 is equal to or greater than the first threshold value T1 and the operating capacity of the internal conditioner 21 can be increased, the air conditioner control unit 18 increases the operating capacity of the internal conditioner 21. In addition, when the operating capacity of the external conditioner 31 is less than the second threshold value T2 and the operating capacity of the internal conditioner 21 can be decreased, the air conditioner control unit 18 decreases the operating capacity of the internal conditioner 21. The control for decreasing the operating capacity of the internal conditioner 21 also includes the control for stopping the operation of the internal conditioner 21.

[0032] In the external conditioner control unit 27, a third threshold value T3 for comparison with the operating capacity of the internal conditioner 21 and a fourth threshold value T4 smaller than the third threshold value T3 are preset in advance. The third threshold value T3 and the fourth threshold value T4 are stored in the storage device of the external conditioner control unit 27. The third threshold value T3 and the fourth threshold value T4 are set via the control unit 10, for example. When the operating capacity of the internal conditioner 21 is equal to or greater than the third threshold value T3 and the operating capacity of the external conditioner 31 can be increased, the external conditioner control unit 27 increases the operating capacity of the external conditioner 31. In addition, when the operating capacity of the internal conditioner 21 is less than the fourth threshold value T4 and the operating capacity of the external conditioner 31 can be decreased, the external conditioner control unit 27 decreases the operating capacity of the external conditioner 31. The control for decreasing the operating capacity of the external conditioner 31 also includes the control for stopping the operation of the external conditioner 31.

[0033] Figure 2 is a flowchart showing the process of the air conditioner system 17 in the first embodiment. The air conditioner control unit 18 determines whether the operating capacity of the external conditioner 31 is equal to or greater than the threshold value T1 (step S101). When the operating capacity of the external conditioner 31 is equal to or greater than the threshold value T1 (step S101: Yes), when the operating capacity of the internal conditioner 21 can be increased, the air conditioner control unit 18 increases the operating capacity of the internal conditioner 21 (step S102), and proceeds to step S105.

[0034] When the operating capacity of the external conditioner 31 is not equal to or greater than the threshold value T1 (step S101: No), the air conditioner control unit 18 determines whether the operating capacity of the external conditioner 31 is less than the threshold value T2 (step S103). When the operating capacity of the external conditioner 31 is less than the threshold value T2 (step S103: Yes), when the operating capacity of the internal conditioner 21 can be decreased, the air conditioner control unit 18 decreases the operating capacity of the internal conditioner 21 (step S104), and proceeds to step S105. When the operating capacity of the external conditioner 31 is not less than the threshold value T2 (step S103: No), the process proceeds to step S105.

[0035] The external conditioner control unit 27 determines whether the operating capacity of the internal conditioner 21 is equal to or greater than the threshold value T3 (step S105). When the operating capacity of the internal conditioner 21 is equal to or greater than the threshold value T3 (step S105: Yes), when the operating capacity of the external conditioner 31 can be increased, the external conditioner control unit 27 increases the operating capacity of the external conditioner 31 (step S106), and ends the process.

[0036] When the operating capacity of the internal regulator 21 is not equal to or greater than the threshold value T3 (step S105: NO), the external regulator control unit 27 determines whether the operating capacity of the internal regulator 21 is less than the threshold value T4 (step S107). When the operating capacity of the internal regulator 21 is less than the threshold value T4 (step S107: YES), when it is possible to reduce the operating capacity of the external regulator 31, the external regulator control unit 27 reduces the operating capacity of the external regulator 31 (step S108), and ends the process. When the operating capacity of the internal regulator 21 is not less than the threshold value T4 (step S107: NO), the process ends.

[0037] The above Figure 2 The processing shown above may not end at step S106 or step S108, but may be set to a loop process that returns to step S101 again after ending at step S106 or step S108. Alternatively, this processing may be performed repeatedly at regular intervals (for example, every 1 minute). This processing may also be performed according to the instructions of the operator of the air conditioning system 17.

[0038] The flow of the basic processing in the first embodiment is as above. As Figure 2 shown in the flowchart, the purpose of the processing in this embodiment is to suppress the load from being biased towards either the external regulator 31 or the internal regulator 21. When it is possible to suppress the load from being biased towards either the external regulator 31 or the internal regulator 21, it is also possible to Figure 2 add or change the processing shown in the flowchart.

[0039] Specifically, a processing example in the case where the threshold values T1 and T3 are set to 80% of the operating capacity and the threshold values T2 and T4 are set to 70% of the operating capacity will be described. First, when the operating capacity of the internal regulator 21 reaches 80% or more, and the set dehumidifying performance is obtained, the air conditioner control unit 18 increases the air volume of the internal regulator 21, and the external regulator control unit 27 increases the operating capacity of the external regulator. The external regulator control unit 27 does not perform air volume correction control when the operating capacity of the internal regulator 21 is less than the threshold value T1 and equal to or greater than the threshold value T3, but controls it in a manner that equalizes with the operating capacity of the internal regulator 21. The air conditioner control unit 18 gradually reduces the air volume correction and switches to normal control when the operating capacity of the external regulator 31 is less than 70%. The normal control here refers to the control of the direct expansion outdoor unit 12 or the internal regulator 21 according to the settings of the remote controller or the indoor temperature.

[0040] In addition, for example, when the operating capacity of the internal conditioner 21 is 80% or more and assuming that the operating capacity of the external conditioner 31 is 100%, the operating capacity of the external conditioner 31 cannot be increased. However, when the ventilation air volume is satisfied, the external conditioner control unit 27 reduces the load of the external conditioner 31 (reduces the air volume, changes the set temperature of the heat source machine, reduces the water flow rate). As a result, although the load of the internal conditioner 21 increases, the load of the external conditioner 31 can be reduced, so that the load bias to either the external conditioner 31 or the internal conditioner 21 can be suppressed.

[0041] By controlling in this way, the load bias to either the external conditioner 31 or the internal conditioner 21 can be suppressed. As a result, it is possible to prevent components of equipment that operate at a high load from being prone to failure, or the maintenance cycle of equipment that operates at a high load from being shortened, so that the operating cost of the air conditioning system can be suppressed.

[0042] [Second Embodiment]

[0043] In the second embodiment, the air conditioner control unit 18 and the external conditioner control unit 27 can communicate in the first communication method or the second communication method. The air conditioner control unit 18 is configured to be able to obtain the operating capacity of the external conditioner 31 through communication. The external conditioner control unit 27 is configured to be able to obtain the operating capacity of the internal conditioner 21 through communication.

[0044] In the air conditioner control unit 18, a specified value A (>0) for comparing the difference between the operating capacity of the external conditioner 31 and the operating capacity of the internal conditioner 21 is preset. The specified value A is stored in the storage device of the air conditioner control unit 18. Similarly, in the external conditioner control unit 27, the above-mentioned specified value A is preset. The specified value A is stored in the storage device of the external conditioner control unit 27. The specified value A is set via the control unit 10, for example.

[0045] When the difference between the operating capacity X of the external conditioner 31 and the operating capacity Y of the internal conditioner 21 becomes larger and is equal to or greater than the specified value A (X - Y ≥ A) and the operating capacity of the internal conditioner 21 can be increased, the air conditioner control unit 18 increases the operating capacity of the internal conditioner 21. In addition, when the difference between the operating capacity of the external conditioner 31 and the operating capacity of the internal conditioner 21 is less than the specified value (X - Y < A) and the operating capacity of the internal conditioner 21 can be reduced, the air conditioner control unit 18 reduces the operating capacity of the internal conditioner 21. The control to reduce the operating capacity of the internal conditioner 21 also includes the control to stop the operation of the internal conditioner 21.

[0046] When the difference between the operation capacity Y of the internal adjuster 21 and the operation capacity X of the external adjuster 31 becomes larger and is equal to or greater than a specified value A (Y - X ≥ A) and the operation capacity of the external adjuster 31 can be increased, the external adjuster control unit 27 increases the operation capacity of the external adjuster 31. In addition, when the difference between the operation capacity of the internal adjuster 21 and the operation capacity of the external adjuster 31 is less than the specified value (Y - X < A) and the operation capacity of the external adjuster 31 can be decreased, the external adjuster control unit 27 decreases the operation capacity of the external adjuster 31. The control to decrease the operation capacity of the external adjuster 31 also includes the control to stop the operation of the external adjuster 31.

[0047] Figure 3 It is a flowchart showing the process of the air conditioning system 17 in the second embodiment. In Figure 3 the flowchart, the difference (X - Y) between the operation capacity X of the external adjuster 31 and the operation capacity Y of the internal adjuster 21 is set as Z. The difference (Y - X) between the operation capacity Y of the internal adjuster 21 and the operation capacity X of the external adjuster 31 is set as W.

[0048] The air conditioner control unit 18 determines whether the difference Z between the operation capacity X of the external adjuster 31 and the operation capacity Y of the internal adjuster 21 is equal to or greater than the specified value A (step S201). When the difference Z between the operation capacity X of the external adjuster 31 and the operation capacity Y of the internal adjuster 21 is equal to or greater than the specified value A (step S201: Yes), when the operation capacity of the internal adjuster 21 can be increased, the air conditioner control unit 18 increases the operation capacity of the internal adjuster 21 (step S202), and proceeds to step S205.

[0049] When the difference Z between the operation capacity X of the external adjuster 31 and the operation capacity Y of the internal adjuster 21 is not equal to or greater than the specified value A (step S201: No), the air conditioner control unit 18 determines whether the difference Z between the operation capacity X of the external adjuster 31 and the operation capacity Y of the internal adjuster 21 changes from a state equal to or greater than the specified value A to less than the specified value A (step S203). When the difference Z between the operation capacity X of the external adjuster 31 and the operation capacity Y of the internal adjuster 21 changes from a state equal to or greater than the specified value A to less than the specified value A (step S203: Yes), when the operation capacity of the internal adjuster 21 can be decreased, the air conditioner control unit 18 decreases the operation capacity of the internal adjuster 21 (step S204), and proceeds to step S205. When the difference Z between the operation capacity X of the external adjuster 31 and the operation capacity Y of the internal adjuster 21 does not change from a state equal to or greater than the specified value A to less than the specified value A (step S203: No), it proceeds to step S205.

[0050] The external conditioner control unit 27 determines whether the difference W between the operation capacity Y of the internal conditioner 21 and the operation capacity X of the external conditioner 31 is equal to or greater than a specified value A (step S205). When the difference W between the operation capacity Y of the internal conditioner 21 and the operation capacity X of the external conditioner 31 is equal to or greater than the specified value A (step S205: YES), and when it is possible to increase the operation capacity of the external conditioner 31, the external conditioner control unit 27 increases the operation capacity of the external conditioner 31 (step S206) and ends the process.

[0051] When the difference W between the operation capacity Y of the internal conditioner 21 and the operation capacity X of the external conditioner 31 is not equal to or greater than the specified value A (step S205: NO), the external conditioner control unit 27 determines whether the difference W between the operation capacity Y of the internal conditioner 21 and the operation capacity X of the external conditioner 31 has changed from a state equal to or greater than the specified value A to less than the specified value A (step S207). When the difference W between the operation capacity Y of the internal conditioner 21 and the operation capacity X of the external conditioner 31 has changed from a state equal to or greater than the specified value A to less than the specified value A (step S207: YES), and when it is possible to decrease the operation capacity of the external conditioner 31, the external conditioner control unit 27 decreases the operation capacity of the external conditioner 31 (step S208) and ends the process. When the difference W between the operation capacity Y of the internal conditioner 21 and the operation capacity X of the external conditioner 31 has not changed from a state equal to or greater than the specified value A to less than the specified value A (step S207: NO), the process ends.

[0052] The above Figure 3 The processing shown can be performed periodically (for example, every 1 minute), or can be performed according to the instructions of the operator of the air conditioning system 17.

[0053] The flow of the basic processing in the second embodiment is as above. As Figure 3 shown in the flowchart, the purpose of the processing in this embodiment is to suppress the load from being biased towards either the external conditioner 31 or the internal conditioner 21. When it is possible to suppress the load from being biased towards either the external conditioner 31 or the internal conditioner 21, it is also possible to add to or change the processing shown in Figure 3 the flowchart.

[0054] A specific example of the processing when the specified value A is set to 20% will be described. When the difference W between the operating capacity Y of the internal conditioner 21 and the operating capacity X of the external conditioner 31 is 20% or more, it is set as the operating capacity capable of obtaining the dehumidifying performance of the external conditioner 31. In this case, the external conditioner control unit 27 increases the operating capacity of the external conditioner 31 by increasing the air volume of the external conditioner 31 or lowering the blowing temperature. As a result, the load is equalized, and thus it is possible to suppress the load from being biased to either the external conditioner 31 or the internal conditioner 21. When the difference W between the operating capacity Y of the internal conditioner 21 and the operating capacity X of the external conditioner 31 changes from a state of 20% or more to less than 20%, the air conditioner control unit 18 stops the operation of the internal conditioner 21, and the external conditioner control unit 27 performs only normal control on the external conditioner 31. Here, the normal control refers to the control of the external conditioner control unit 27 based on the setting of the remote controller or the temperature of the external air sucked in. By stopping the device with a high load among the external conditioner 31 and the internal conditioner 21 in this way, it is possible to reduce the operating time of the device with a high load.

[0055] As a result, it is possible to suppress the load from being biased to either the external conditioner 31 or the internal conditioner 21. Thus, it is possible to prevent components of the device that becomes a high-load operation from being prone to failure, or the maintenance cycle of the device that becomes a high-load operation from being shortened, and therefore it is possible to suppress the operating cost of the air conditioning system.

[0056] Several embodiments of the present invention have been described, but 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 ways, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments or their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and its equivalent scope.

[0057] Description of Reference Numerals

[0058] 10 Control Unit

[0059] 12 Direct Expansion Outdoor Unit

[0060] 14, 15 Buildings

[0061] 16 Exhaust Duct

[0062] 17 Air Conditioning System

[0063] 18 Air Conditioner Control Unit

[0064] 19 Refrigerant Connecting Pipe

[0065] 21 Internal Conditioner

[0066] 22 Remote Controller

[0067] 23 and 24 spaces

[0068] 25 air supply pipeline

[0069] 26 exhaust fan

[0070] 27 external regulator control unit

[0071] 28 suction pipeline

[0072] 29 external regulator blower

[0073] 30 humidifier

[0074] 31 external regulator

[0075] 32 water coil

[0076] 34 suction port

[0077] 40 heat source machine

[0078] L1, L2, L3 communication lines.

Claims

1. An air conditioning system, which is an air conditioning system including an internal conditioner and an external conditioner, is characterized in that, Comprising: An internal regulator control unit, when the operating capacity of the external regulator is equal to or greater than a first threshold value and the operating capacity of the internal regulator can be increased, increases the operating capacity of the internal regulator, and when the operating capacity of the external regulator is less than a second threshold value smaller than the first threshold value and the operating capacity of the internal regulator can be decreased, decreases the operating capacity of the internal regulator; An external regulator control unit, when the operating capacity of the internal regulator is equal to or greater than a third threshold value and the operating capacity of the external regulator can be increased, increases the operating capacity of the external regulator, and when the operating capacity of the internal regulator is less than a fourth threshold value smaller than the third threshold value and the operating capacity of the external regulator can be decreased, decreases the operating capacity of the external regulator.

2. An air conditioning system, which is an air conditioning system including an internal conditioner and an external conditioner, is characterized in that, Comprising: An internal regulator control unit, when the difference between the operating capacity of the external regulator and the operating capacity of the internal regulator becomes larger and is equal to or greater than a specified value and the operating capacity of the internal regulator can be increased, increases the operating capacity of the internal regulator, and when the difference between the operating capacity of the external regulator and the operating capacity of the internal regulator is less than the specified value and the operating capacity of the internal regulator can be decreased, decreases the operating capacity of the internal regulator; An external regulator control unit, when the difference between the operating capacity of the internal regulator and the operating capacity of the external regulator becomes larger and is equal to or greater than a specified value and the operating capacity of the external regulator can be increased, increases the operating capacity of the external regulator, and when the difference between the operating capacity of the internal regulator and the operating capacity of the external regulator is less than the specified value and the operating capacity of the external regulator can be decreased, decreases the operating capacity of the external regulator.

3. A control method, which is a control method for an air-conditioning system including an internal regulator and an external regulator, characterized in that when the operating capacity of the external regulator is equal to or greater than a first threshold value and the operating capacity of the internal regulator can be increased, increases the operating capacity of the internal regulator, and when the operating capacity of the external regulator is less than a second threshold value smaller than the first threshold value and the operating capacity of the internal regulator can be decreased, decreases the operating capacity of the internal regulator; when the operating capacity of the internal regulator is equal to or greater than a third threshold value and the operating capacity of the external regulator can be increased, increases the operating capacity of the external regulator, and when the operating capacity of the internal regulator is less than a fourth threshold value smaller than the third threshold value and the operating capacity of the external regulator can be decreased, decreases the operating capacity of the external regulator.

4. A control method, which is a control method for an air-conditioning system including an internal regulator and an external regulator, characterized in that When the difference between the operating capacity of the external regulator and the operating capacity of the internal regulator becomes larger than or equal to a specified value and the operating capacity of the internal regulator can be increased, increase the operating capacity of the internal regulator, and when the difference between the operating capacity of the external regulator and the operating capacity of the internal regulator is less than the specified value and the operating capacity of the internal regulator can be decreased, decrease the operating capacity of the internal regulator; When the difference between the operating capacity of the internal regulator and the operating capacity of the external regulator becomes larger than or equal to a specified value and the operating capacity of the external regulator can be increased, increase the operating capacity of the external regulator, and when the difference between the operating capacity of the internal regulator and the operating capacity of the external regulator is less than the specified value and the operating capacity of the external regulator can be decreased, decrease the operating capacity of the external regulator.

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