Air conditioning unit, control method thereof and machine readable storage medium

Abstract

The invention relates to the technical field of air treatment equipment, in particular to a control method of an air conditioning unit, a machine readable storage medium and the air conditioning unit. The control method of the air conditioning unit comprises the following steps that in response to a starting instruction of a refrigeration mode or a heating mode, compressors of a plurality of unit systems are started in a peak shifting mode according to a first control strategy; and controlling the operation frequencies of the compressors of the plurality of unit systems according to a second control strategy to prevent the same frequency of any two compressors. By the adoption of the control method, the phenomenon of same-frequency resonance of the compressors of the multi-system air conditioning unit can be prevented, the resonance problem of the multi-system air conditioning unit in the operation process is comprehensively solved, the operation reliability of the air conditioning unit is improved, and the service life of the air conditioning unit is prolonged.

Description

Technical Field

[0001] This invention relates to the field of air handling equipment technology, and in particular to control methods for air conditioning units, machine-readable storage media, and air conditioning units. Background Technology

[0002] Currently, variable frequency air conditioning units experience resonance issues during frequency adjustment operation. When the unit operates at its inherent resonant frequency, this resonance leads to excessive vibration stress in the piping, causing fatigue damage and ultimately resulting in cracks and leaks, thus affecting the unit's lifespan. To address this resonance problem, the unit's inherent frequency resonant point is shielded during operation. However, multi-system air conditioning units, comprising multiple heat pump systems, also experience resonance when the compressors of different systems operate at the same frequency. Therefore, existing resonance elimination methods are simplistic, only considering the unit's inherent frequency resonant point, and cannot completely resolve the resonance problem in multi-system air conditioning units, thereby reducing their lifespan. Summary of the Invention

[0003] In view of the above problems, the present invention is proposed to provide a control method, machine-readable storage medium and air conditioning unit for an air conditioning unit that overcomes or at least partially solves the above problems, and can solve the problem of synchronous resonance of compressors in multi-system air conditioning units, thereby improving the service life of the air conditioning unit.

[0004] On one hand, the present invention provides a control method for an air conditioning unit, the air conditioning unit comprising multiple unit systems; the control method includes:

[0005] In response to the start command of cooling mode or heating mode, the compressors of multiple said unit systems are started in staggered shifts according to the first control strategy;

[0006] The operating frequency of the compressors of the multiple unit systems is controlled according to the second control strategy to prevent any two compressors from operating at the same frequency in advance.

[0007] Optionally, the method of staggering the start-up of compressors in multiple unit systems according to the first control strategy includes:

[0008] The compressor of one of the unit systems is started according to the first control strategy;

[0009] The compressor of the next unit system is started according to the first control strategy;

[0010] The first control strategy includes controlling the compressor to increase its frequency to the target frequency at a preset frequency increase rate, and running at the target frequency for a first time.

[0011] Optionally, before controlling the compressor of the next unit system to start according to the first control strategy, the method further includes:

[0012] Determine whether the startup conditions of the next unit system are met;

[0013] If so, then the step of controlling the compressor start of the next unit system according to the first control strategy is performed.

[0014] Optionally, the second control strategy includes:

[0015] Obtain the predicted operating status of the compressor;

[0016] The operating frequency of the compressor is controlled at least based on the predicted operating conditions.

[0017] Optionally, obtaining the predicted operating status of the compressor includes:

[0018] Obtain the current parameter values ​​of the operating parameters of the unit system;

[0019] Based on the current parameter value, obtain the predicted parameter value of the running parameters after the second time.

[0020] The predicted operating status of the compressor is obtained based on the predicted parameter values.

[0021] Optionally, the predicted operating conditions include predicted operating frequency and / or predicted frequency actions;

[0022] The predicted frequency action includes frequency upscaling and frequency downscaling.

[0023] Optionally, the operating parameters include water temperature parameters and / or compressor operating parameters.

[0024] Optionally, controlling the operating frequency of the compressor based at least on the predicted operating conditions includes:

[0025] The operating frequency of the compressor is controlled based on the predicted operating conditions, the predicted parameter values, and / or the current operating time of the compressor.

[0026] Optionally, the predicted operating conditions include the predicted operating frequency;

[0027] The aforementioned control of the compressor's operating frequency based at least on the predicted operating conditions includes:

[0028] In response to the fact that the predicted operating frequencies of the two compressors are the same, one of the two compressors is controlled to continue to execute the current operating frequency, while the other executes the corresponding predicted operating frequency.

[0029] Optionally, the predicted operating conditions include: predicted operating frequency and predicted frequency actions;

[0030] The aforementioned control of the compressor's operating frequency based at least on the predicted operating conditions includes:

[0031] In response to the fact that the predicted operating frequencies of the two compressors are the same but the predicted frequency actions are different, the compressor whose predicted frequency action is to increase the frequency is controlled to continue operating at the current operating frequency, and the compressor whose predicted frequency action is to decrease the frequency is controlled to decrease the frequency; and / or

[0032] In response to the two compressors having the same predicted operating frequency, the same predicted frequency action, and different predicted parameter values, the compressor with the higher predicted parameter value is controlled to execute the predicted frequency action, while the other compressor continues to execute the current operating frequency; and / or

[0033] In response to the two compressors having the same predicted operating frequency, the same predicted frequency action, the same predicted parameter value, and different current running lengths, the compressor with the shorter current running length is controlled to continue executing the current operating frequency, while the other compressor executes the predicted frequency action.

[0034] Optionally, determining whether the next startup condition of the unit system is met includes:

[0035] Based on the return water temperature difference and / or the rate of change of the return water temperature difference, determine whether the start-up conditions of the next unit system are met.

[0036] On the other hand, the present invention also provides a machine-readable storage medium having a machine-executable program stored thereon, which, when executed by a processor, implements the control method as described in any of the preceding claims.

[0037] In another aspect, the present invention also provides an air conditioning unit, including a controller, the controller including a memory, a processor and a machine-executable program stored in the memory and running on the processor, and the processor, when executing the machine-executable program, implements the control method as described in any of the preceding claims.

[0038] Optionally, each of the said unit systems includes a shell-and-tube heat exchanger; or

[0039] The two unit systems share a single shell-and-tube heat exchanger.

[0040] In the air conditioning unit control method, machine-readable storage medium, and air conditioning unit of the present invention, a control method is provided to prevent compressors of different unit systems from resonating at the same frequency in advance. On the one hand, in the first stage, the compressors of different unit systems are started at staggered times, which can avoid compressors resonating at the same frequency during the start-up phase. On the other hand, in the second stage, the operating frequency of the compressors of different unit systems is adjusted according to a second control strategy, which can prevent any two compressors from resonating at the same frequency in advance. Therefore, by adopting the control method of the present invention, the phenomenon of compressor resonating at the same frequency in multi-system air conditioning units can be prevented, comprehensively solving the resonance problem during the operation of multi-system air conditioning units, and improving the operational reliability and service life of the air conditioning units.

[0041] Furthermore, the control method of the present invention has the advantages of simple control procedures and easy execution.

[0042] Therefore, those skilled in the art will more readily understand the above and other objects, advantages and features of the present invention from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0043] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0044] Figure 1 This is a schematic flowchart of an air conditioning unit control method according to an embodiment of the present invention;

[0045] Figure 2 This is a schematic flowchart of an air conditioning unit control method according to an embodiment of the present invention;

[0046] Figure 3 This is a schematic flowchart of an air conditioning unit control method according to an embodiment of the present invention;

[0047] Figure 4 This is a schematic flowchart of an air conditioning unit control method according to an embodiment of the present invention;

[0048] Figure 5 This is a schematic flowchart of an air conditioning unit control method according to an embodiment of the present invention;

[0049] Figure 6 This is a schematic flowchart of an air conditioning unit control method according to an embodiment of the present invention;

[0050] Figure 7 This is a schematic flowchart of an air conditioning unit control method according to an embodiment of the present invention;

[0051] Figure 8 This is a schematic structural diagram of a machine-readable storage medium according to an embodiment of the present invention;

[0052] Figure 9 This is a schematic structural diagram of an air conditioning unit according to an embodiment of the present invention;

[0053] Figure 10 This is a schematic diagram of the working principle of an air conditioning unit according to an embodiment of the present invention. Detailed Implementation

[0054] The following reference Figures 1 to 10 This invention describes an air conditioning unit control method, a machine-readable storage medium, and an air conditioning unit according to embodiments of the present invention. The terms "front," "rear," "upper," "lower," "top," "bottom," "inner," "outer," and "lateral," etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These are used solely for the purpose of facilitating and simplifying the description of the invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0055] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," etc., may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0056] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," and "coupling," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] Figure 1 This is a schematic flowchart of a control method for an air conditioning unit according to an embodiment of the present invention, and in conjunction with... Figure 2-7 This invention provides a control method for an air conditioning unit. The air conditioning unit includes multiple unit systems, and each unit system includes a compressor.

[0058] like Figure 1 As shown, a control method for an air conditioning unit includes the following steps:

[0059] S100, in response to the start command of cooling mode or heating mode, starts the compressors of multiple unit systems in staggered shifts according to the first control strategy.

[0060] S200 controls the operating frequency of the compressors in multiple unit systems according to the second control strategy to prevent any two compressors from operating at the same frequency.

[0061] Specifically, step S100 refers to: when the air conditioning unit receives a start command for cooling mode or heating mode, it starts the compressors of multiple unit systems in a staggered manner according to the first control strategy. In step S200, compressor operating at the same frequency means that different compressors operate at the same frequency at the same time.

[0062] This embodiment provides a control method to prevent compressor resonance in different unit systems in advance. On the one hand, in the first stage (i.e., the start-up stage), the compressors of different unit systems are started at staggered times, which can avoid compressor resonance during the start-up stage. On the other hand, in the second stage (i.e., the stable operation stage of the compressors), the operating frequency of the compressors of different unit systems is adjusted according to a second control strategy, which can prevent any two compressors from resonating at the same frequency in advance. Therefore, the control method of this embodiment can prevent compressor resonance in multi-system air conditioning units, comprehensively solve the resonance problem during the operation of multi-system air conditioning units, and improve the operational reliability and service life of the air conditioning units.

[0063] In some alternative embodiments of the invention, the multiple unit systems include two unit systems. In some alternative embodiments, the multiple unit systems include more than two unit systems, for example, three, four, five, six, or more than six unit systems.

[0064] like Figure 2 As shown, in some optional embodiments of the present invention, step S100, starting the compressors of multiple unit systems in a staggered manner according to the first control strategy, includes the following steps:

[0065] S101, control the compressor of a unit system to start according to the first control strategy.

[0066] S102, control the compressor of the next unit system to start according to the first control strategy.

[0067] The first control strategy includes controlling the compressor to increase its frequency to the target frequency at a preset rate, and then operating at the target frequency for a first period of time. Specifically, the target frequency and the preset rate of increase can be set as needed; preferably, the target frequency is 60Hz and the preset rate of increase is 5Hz / s. This embodiment provides a specific method for controlling compressor startup during off-peak hours, which has the advantages of simple and easy-to-execute control procedures.

[0068] like Figure 3 As shown in some optional embodiments of the present invention, before step S102, which controls the compressor of the next unit system to start according to the first control strategy, the method further includes step S103, which determines whether the starting conditions of the next unit system are met; if so, step S102 is executed. In this embodiment, the above steps are more conducive to energy conservation and emission reduction. In other optional embodiments of the present invention, after step S100 is executed, step S200 is executed directly.

[0069] In some optional embodiments of the present invention, step S103, determining whether the start-up conditions of the next unit system are met, includes the following steps: determining whether the start-up conditions of the next unit system are met based on the return water temperature difference and the rate of change of the return water temperature difference; or, determining whether the start-up conditions of the next unit system are met based on the return water temperature difference or the rate of change of the return water temperature difference. This embodiment provides a specific method for determining whether the start-up conditions of the next unit system are met, which has the beneficial effect of being simple and easy to implement.

[0070] Furthermore, the return water temperature difference ΔTcw1 = return water temperature Twi1 - return water temperature setpoint Twi d That is, the return water temperature difference is equal to the difference between the return water temperature and the set return water temperature. The rate of change of return water temperature difference ΔTcw10 = current outlet water temperature difference ΔTcw1 - previous outlet water temperature ΔTcw0.

[0071] Furthermore, the startup conditions for the next unit system include at least one of the following conditions: the return water temperature difference is greater than the preset difference; the return water temperature difference change rate is greater than the preset change rate.

[0072] like Figure 4 As shown, in some optional embodiments of the present invention, the second control strategy includes the following steps:

[0073] S210, obtain the predicted operating status of the compressor.

[0074] S220 controls the compressor's operating frequency based at least on predicted operating conditions.

[0075] This embodiment provides a specific control method for a second control strategy, which controls the operating frequency of multiple compressors based on at least the predicted operating conditions of multiple compressors. Using this method, the phenomenon of compressors operating at the same frequency can be effectively prevented. Furthermore, this method has the advantages of simple and easy-to-execute control procedures.

[0076] like Figure 5 As shown, in some optional embodiments of the present invention, step S210, obtaining the predicted operating conditions of the compressor, includes the following steps:

[0077] S211, obtain the current parameter values ​​of the unit system's operating parameters.

[0078] S212, based on the current parameter value, obtain the predicted parameter value of the running parameters after the second time.

[0079] S213, obtain the predicted operating status of the compressor based on the predicted parameter values.

[0080] This embodiment provides a specific method for obtaining the predicted operating conditions of a compressor. Using this method, the predicted operating conditions of the compressor can be predicted quickly and scientifically, thereby improving the accuracy of compressor frequency control.

[0081] In some optional embodiments of the present invention, step S210, predicting the operating conditions includes predicting the operating frequency.

[0082] In some optional embodiments of the present invention, step S210, predicting the operating conditions, includes predicting frequency actions. These frequency prediction actions include frequency upscaling and frequency downscaling.

[0083] In some optional embodiments of the present invention, step S210, predicting the operating conditions, includes predicting the operating frequency and predicting frequency actions. The predicted frequency actions include frequency increase and frequency decrease. In this embodiment, controlling the operating frequencies of multiple compressors based on their predicted operating frequencies and predicted frequency actions is more conducive to achieving precise control of different compressors, thereby better preventing resonance between any two compressors.

[0084] In some alternative embodiments of the present invention, the operating parameters include water temperature parameters.

[0085] In some alternative embodiments of the present invention, the operating parameters include compressor operating parameters.

[0086] In some optional embodiments of the present invention, the operating parameters include water temperature parameters and compressor operating parameters. In this embodiment, using both water temperature parameters and compressor operating parameters to predict the compressor's predicted operating conditions can improve prediction accuracy.

[0087] Furthermore, the water temperature parameters include: return water temperature and / or outlet water temperature. Going a step further, the return water temperature is the return water temperature corresponding to the shell-and-tube heat exchanger, and the outlet water temperature is the outlet water temperature corresponding to the shell-and-tube heat exchanger.

[0088] Furthermore, the compressor operating parameters include at least one of the following: discharge temperature, suction temperature, module temperature, discharge pressure, suction pressure, current, and voltage.

[0089] In some optional embodiments of the present invention, S220, controlling the compressor's operating frequency based at least on predicted operating conditions includes the following steps: controlling the compressor's operating frequency based on the compressor's predicted operating conditions and predicted parameter values. Compared to controlling the compressor's operating frequency solely based on the compressor's predicted operating conditions, this embodiment is more advantageous in improving the accuracy of compressor frequency control and is more advantageous in preventing resonance between different compressors.

[0090] In some optional embodiments of the present invention, S220, controlling the compressor's operating frequency based at least on predicted operating conditions includes the following steps: controlling the compressor's operating frequency based on the compressor's predicted operating conditions and current operating time. Compared to controlling the compressor's operating frequency solely based on its predicted operating conditions, this embodiment is more conducive to improving the accuracy of compressor control and more conducive to preventing resonance between different compressors.

[0091] In some optional embodiments of the present invention, S220, controlling the compressor's operating frequency based at least on predicted operating conditions includes the following steps: controlling the compressor's operating frequency based on the compressor's predicted operating conditions, predicted parameter values, and current operating duration. Compared to controlling the compressor's operating frequency solely based on its predicted operating conditions, this embodiment is more conducive to improving the accuracy of compressor control and is more conducive to preventing resonance between different compressors at the same frequency in advance.

[0092] In some optional embodiments of the present invention, predicting operating conditions includes predicting operating frequency. S220, controlling the compressor's operating frequency, at least based on the predicted operating conditions, includes the following steps: in response to the two compressors having the same predicted operating frequency, controlling one of the two compressors to continue executing its current operating frequency, while the other executes its corresponding predicted operating frequency. This embodiment provides a specific method for preventing compressors from operating at the same frequency in advance, which has the advantages of being simple to operate and easy to implement.

[0093] In some optional embodiments of the present invention, the predicted operating conditions include: predicted operating frequency and predicted frequency action. S220, controlling the operating frequency of the compressor, at least based on the predicted operating conditions, includes the following steps: S221, when the predicted operating frequencies of the two compressors are the same but their predicted frequency actions are different, controlling the compressor whose predicted frequency action is to increase frequency to continue operating at the current operating frequency, and controlling the compressor whose predicted frequency action is to decrease frequency to decrease frequency. In some alternative embodiments, when the predicted operating frequencies of the two compressors are the same but their predicted frequency actions are different, controlling the compressor whose predicted frequency action is to decrease frequency to continue operating at the current operating frequency, and controlling the compressor whose predicted frequency action is to increase frequency to increase frequency. Compared with the above alternative embodiments, this embodiment controls the compressor whose predicted frequency action is to increase frequency to continue not to perform the frequency increase action, which is more conducive to improving the operational stability of the air conditioning unit.

[0094] In some optional embodiments of the present invention, the predicted operating conditions include: predicted operating frequency and predicted frequency action. S220, controlling the compressor's operating frequency based at least on the predicted operating conditions includes the following steps: S222, when the predicted operating frequencies of two compressors are the same, the predicted frequency actions are the same, and the predicted parameter values ​​are different, the compressor with the higher predicted parameter value is controlled to execute the predicted frequency action, while the compressor with the lower predicted parameter value continues to execute the current operating frequency. The control method of this embodiment is more conducive to improving the operational stability of the air conditioning unit.

[0095] In some optional embodiments of the present invention, predicting operating conditions includes: predicting operating frequency and predicting frequency action. S220, controlling the compressor's operating frequency based at least on the predicted operating conditions includes the following steps: S223, when the predicted operating frequencies of two compressors are the same, the predicted frequency actions are the same, the predicted parameter values ​​are the same, and their current running times are different, then the compressor with the shorter current running time continues to execute its current operating frequency, and the compressor with the longer current running time executes the predicted frequency action. The control method of this embodiment is more conducive to improving the operational stability of the air conditioning unit.

[0096] In some optional embodiments of the present invention, step S220, controlling the operating frequency of the compressor based at least on the predicted operating conditions, includes two of steps S221, S222, and S223.

[0097] like Figure 6 As shown, in some optional embodiments of the present invention, step S220, at least based on the predicted operating conditions, controls the operating frequency of the compressor, including steps S221, S222 and S223.

[0098] In some alternative embodiments of the present invention, an air conditioning unit includes two unit systems. The two unit systems are a first unit system and a second unit system. The compressor of the first unit system is a first compressor. The compressor of the second unit system is a second compressor.

[0099] like Figure 7 As shown, a control method for an air conditioning unit includes the following steps:

[0100] S1 receives the command to start the cooling mode.

[0101] S2 controls the cooling operation of the first unit system, controlling the first compressor to increase the frequency to 60Hz at a speed of 5Hz / s, and to run at 60Hz for T1 minutes.

[0102] S3: Determine whether the second unit system needs to be started based on the return water temperature difference ΔTcw1; if so, execute S4 and S51.

[0103] S4 controls the cooling operation of the second unit system, controlling the second compressor to increase the frequency to 60Hz at a speed of 5Hz / s, and then running the second compressor at 60Hz for T1 minutes.

[0104] S51 collects parameters such as the current return water temperature, outlet water temperature, exhaust temperature, intake temperature, module temperature, exhaust pressure, intake pressure, current, and voltage of the first unit system, performs curve simulation, calculates the parameter values ​​of the first unit system after T2 minutes, predicts the frequency action and operating frequency of the first compressor after T2 minutes, and obtains the predicted parameter values, predicted frequency action, and predicted operating frequency.

[0105] S52 collects parameters such as the current return water temperature, outlet water temperature, exhaust temperature, intake temperature, module temperature, exhaust pressure, intake pressure, current, and voltage of the second unit system, performs curve simulation, calculates the parameter values ​​of the second unit system after T2 minutes, predicts the frequency action and operating frequency of the second compressor after T2 minutes, and obtains the predicted parameter values, predicted frequency action, and predicted operating frequency.

[0106] S6, determine whether the predicted operating frequencies of the two compressors are the same; if not, proceed to S7; if yes, proceed to S8.

[0107] S7, do not process, proceed to the next round of simulation calculation;

[0108] S8, determine whether the predicted frequency actions of the two compressors are the same; if not, proceed to S9; if not, proceed to S10.

[0109] S9: For compressors whose predicted frequency action is to increase frequency, the compressor will maintain its current operating frequency and will not perform the frequency increase action; for compressors whose predicted frequency action is to decrease frequency, the compressor will perform the frequency decrease action.

[0110] S10, determine whether the predicted parameter values ​​of the two unit systems are the same; if not, proceed to S11; if yes, proceed to S12.

[0111] S11, the compressor corresponding to the lower value of the two predicted parameter values ​​maintains the current operating frequency, while the compressor corresponding to the higher value executes the predicted frequency action;

[0112] S12, determine whether the current running time of the two compressors is the same; if not, proceed to S13;

[0113] S13, the compressor with the shorter current running time among the two compressors maintains its current operating frequency, while the compressor with the longer current running time executes the predicted frequency action.

[0114] Specifically, in step S5, referring to Tables 1 and 2, the compressor frequency operation after T2 minutes is predicted. Under normal conditions, the compressor operating frequency is adjusted according to Table 1, with an adjustment cycle of T2 minutes and an adjustment speed of 1 Hz / s. Under fault protection conditions, the compressor operating frequency is adjusted in real-time according to Table 2, i.e., real-time fault protection frequency adjustment is performed according to Table 2, with an adjustment frequency of 3 Hz / s. When two fault protection actions conflict: ① compressor shutdown takes priority; ② higher fault level takes priority, i.e., 1 > 2 > 3; ③ when frequency reduction and frequency increase conflict, frequency reduction takes priority.

[0115] Table 1. Compressor operating frequency adjustment table under normal conditions

[0116]

[0117] Table 2 Compressor Operating Frequency Adjustment Table under Fault Protection Conditions

[0118]

[0119] The beneficial effects of this embodiment are as follows: 1. By staggering the peak-shaving adjustment during the start-up target frequency maintenance phase of each system compressor, synchronous resonance operation during the start-up phase is avoided. 2. By simulating and predicting the operating frequency of each compressor in the unit through frequency influence parameters during compressor operation, the resonance frequency point of the unit can be predicted in advance, while also taking into account the shielding of the unit's inherent frequency operation, making it more intelligent. 3. By suppressing the frequency adjustment of each compressor through the predicted resonance frequency, synchronous resonance operation of the compressors is avoided, making it safer and more reliable, and extending the service life of the unit.

[0120] Figure 8This is a schematic diagram of a machine-readable storage medium 200 according to an embodiment of the present invention, as shown below. Figure 8 As shown, this embodiment of the invention also provides a machine-readable storage medium 200, on which a machine-executable program 201 is stored. When the machine-executable program 201 is executed by the processor 132, it implements the control method of the air conditioning unit 100 according to any of the above embodiments.

[0121] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be specifically implemented in any machine-readable storage medium 200 for use by, or in conjunction with, an instruction execution system, apparatus or device (such as a computer-based system, a system including processor 132 or other system that can fetch and execute instructions from an instruction execution system, apparatus or device).

[0122] For the purposes of this embodiment, the machine-readable storage medium 200 can be any means capable of containing, storing, communicating, propagating, or transmitting a program for use by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the machine-readable storage medium 200 include: an electrical connection (electronic device) having one or more wires, a portable computer disk drive (magnetic device), random access memory 131 (RAM), read-only memory 131 (ROM), erasable and editable read-only memory 131 (EPROM or flash memory 131), fiber optic devices, and portable optical disc read-only memory 131 (CDROM). Furthermore, the machine-readable storage medium 200 can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in the memory 131.

[0123] Figure 9 This is a schematic diagram of an air conditioning unit 100 according to an embodiment of the present invention, as shown below. Figure 9 As shown, this embodiment of the invention also provides an air conditioning unit 100, which includes a controller 130. The controller 130 includes a memory 131, a processor 132, and a machine-executable program 201 stored in the memory 131 and running on the processor 132. When the processor 132 executes the machine-executable program 201, it implements the control method of the air conditioning unit according to any of the above embodiments.

[0124] Specifically, controller 130 may include processor 132 adapted to execute stored instructions and memory 131 providing temporary storage space for the operation of said instructions during operation. Processor 132 may be a single-core processor 132, a multi-core processor 132, a computing cluster, or any other configuration. Memory 131 may include random access memory 131 (RAM), read-only memory 131, flash memory, or any other suitable storage system.

[0125] The processor 132 can be connected via a system interconnect (e.g., PCI, PCI-Express, etc.) to an I / O interface (input / output interface) suitable for connecting the air conditioning unit 100 to one or more I / O devices (input / output devices). The I / O devices may include, for example, a keyboard and indicating devices, wherein the indicating devices may include a touchpad or a touch screen, etc.

[0126] The processor 132 can also be linked via a system interconnect to a display interface suitable for connecting the controller 130 to a display device. The display device may include a display screen that is a built-in component of the controller 130. The display device may also include a computer monitor, television, or projector externally connected to the air conditioning unit 100. Furthermore, a network interface controller (NIC) may be adapted to connect the controller 130 to a network via a system interconnect. In some embodiments, the NIC may use any suitable interface or protocol (such as an Internet Minicomputer System Interface) to transmit data. The network may be a cellular network, a radio network, a wide area network (WAN), a local area network (LAN), or the Internet, etc. Remote devices can connect to the controller 130 via the network.

[0127] In some alternative embodiments of the invention, each unit system includes a shell-and-tube heat exchanger. In another alternative embodiment of the invention, two unit systems share a single shell-and-tube heat exchanger.

[0128] like Figure 10 As shown, in some optional embodiments of the present invention, the air conditioning unit 100 includes a first unit system 110 and a second unit system 120. The first unit system 110 and the second unit system 120 share a shell-and-tube heat exchanger 140. This arrangement allows for a more compact structure of the unit, saving floor space.

[0129] Further, the first unit system 110 includes a first compressor 111, a first liquid receiver 112, and a first four-way valve 113; the second unit system 120 includes a second compressor 121, a second liquid receiver 122, and a second four-way valve 123. The shell-and-tube heat exchanger 140 has a first channel, a second channel, and a third channel. The first channel is used for the flow of a first refrigerant; one of the inlet and outlet of the first channel is connected to the first four-way valve 113, and the other is connected to the first liquid receiver 112. The second channel is used for the flow of a second refrigerant; one of the inlet and outlet of the second channel is connected to the second four-way valve 123, and the other is connected to the second liquid receiver 122. The third channel is used for the flow of circulating water; the outlet of the third channel is connected to the outlet pipe, and the inlet of the third channel is connected to the return pipe. The function of the shell-and-tube heat exchanger 140 is to exchange heat between the first refrigerant in the first channel and the circulating water in the third channel, and to exchange heat between the second refrigerant in the second channel and the circulating water in the third channel.

[0130] Furthermore, the air conditioning unit 100 also includes a first temperature sensor 151 and a second temperature sensor 152. The first temperature sensor 151 is used to obtain the return water temperature. The second temperature sensor 152 is used to obtain the outlet water temperature.

[0131] The flowchart provided in this embodiment is not intended to indicate that the operations of the method will be performed in any particular order, or that all operations of the method are included in every case. Furthermore, the method may include additional operations. Within the scope of the technical concept provided by the method in this embodiment, additional variations can be made to the above method.

[0132] While this invention provides several exemplary embodiments, many other variations or modifications consistent with the principles of this invention can be directly determined or derived from the disclosure of this invention without departing from its spirit and scope. Therefore, the scope of this invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A control method for an air conditioning unit, characterized in that, The air conditioning unit includes multiple unit systems; the control method includes: In response to the start command of cooling mode or heating mode, the compressors of multiple said unit systems are started in staggered shifts according to the first control strategy; The operating frequency of the compressors of the multiple unit systems is controlled according to the second control strategy to prevent any two compressors from operating at the same frequency in advance.

2. The control method according to claim 1, characterized in that, The method of staggering the start-up of compressors in multiple unit systems according to the first control strategy includes: The compressor of one of the unit systems is started according to the first control strategy; The compressor of the next unit system is started according to the first control strategy; The first control strategy includes controlling the compressor to increase its frequency to the target frequency at a preset frequency increase rate, and running at the target frequency for a first time.

3. The control method according to claim 2, characterized in that, Before controlling the compressor of the next unit system to start according to the first control strategy, the following steps are also included: Determine whether the startup conditions of the next unit system are met; If so, then the step of controlling the compressor start of the next unit system according to the first control strategy is performed.

4. The control method according to claim 1, characterized in that, The second control strategy includes: Obtain the predicted operating status of the compressor; The operating frequency of the compressor is controlled at least based on the predicted operating conditions.

5. The control method according to claim 4, characterized in that, The method of obtaining the predicted operating status of the compressor includes: Obtain the current parameter values ​​of the operating parameters of the unit system; Based on the current parameter value, obtain the predicted parameter value of the running parameters after the second time. The predicted operating status of the compressor is obtained based on the predicted parameter values.

6. The control method according to claim 5, characterized in that, The predicted operating conditions include the predicted operating frequency and / or the predicted frequency actions; The predicted frequency action includes frequency upscaling and frequency downscaling.

7. The control method according to claim 5, characterized in that, The operating parameters include water temperature parameters and / or compressor operating parameters.

8. The control method according to claim 5, characterized in that, The aforementioned control of the compressor's operating frequency based at least on the predicted operating conditions includes: The operating frequency of the compressor is controlled based on the predicted operating conditions, the predicted parameter values, and / or the current operating time of the compressor.

9. The control method according to claim 5, characterized in that, The predicted operating conditions include the predicted operating frequency; The aforementioned control of the compressor's operating frequency based at least on the predicted operating conditions includes: In response to the fact that the predicted operating frequencies of the two compressors are the same, one of the two compressors is controlled to continue to execute the current operating frequency, while the other executes the corresponding predicted operating frequency.

10. The control method according to claim 5, characterized in that, The predicted operational status includes: predicted operational frequency and predicted frequency actions; The aforementioned control of the compressor's operating frequency based at least on the predicted operating conditions includes: In response to the fact that the predicted operating frequencies of the two compressors are the same but the predicted frequency actions are different, the compressor whose predicted frequency action is to increase the frequency is controlled to continue operating at the current operating frequency, and the compressor whose predicted frequency action is to decrease the frequency is controlled to decrease the frequency; and / or In response to the two compressors having the same predicted operating frequency, the same predicted frequency action, and different predicted parameter values, the compressor with the higher predicted parameter value is controlled to execute the predicted frequency action, while the other compressor continues to execute the current operating frequency; and / or In response to the two compressors having the same predicted operating frequency, the same predicted frequency action, the same predicted parameter value, and different current running lengths, the compressor with the shorter current running length is controlled to continue executing the current operating frequency, while the other compressor executes the predicted frequency action.

11. The control method according to claim 3, characterized in that, The determination of whether the startup conditions of the next unit system are met includes: Based on the return water temperature difference and / or the rate of change of the return water temperature difference, determine whether the start-up conditions of the next unit system are met.

12. A machine-readable storage medium, characterized in that, It stores a machine-executable program thereon, which, when executed by a processor, implements the control method as described in any one of claims 1 to 11.

13. An air conditioning unit, characterized in that, The controller includes a memory, a processor, and a machine-executable program stored in the memory and running on the processor, wherein when the processor executes the machine-executable program, it implements the control method as described in any one of claims 1 to 11.

14. The air conditioning unit according to claim 13, characterized in that, Each of the aforementioned unit systems includes a shell-and-tube heat exchanger; or The two unit systems share a single shell-and-tube heat exchanger.

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